Spin-on filter

Abstract

The utility model discloses a kind of spin-on filter, generally by screw connection into engine oil circuit, filter includes filter core and filter chamber, filter core is located in filter chamber, wherein filter core includes annular filter medium, and the first end cover and second end cover connected with the both ends of annular filter medium, annular filter medium has the central cavity defined around its central axis;Filter chamber includes shell and cover, cover has the inflow passage of oil liquid into filter chamber;It further includes the riser connected with cover, riser has the outflow passage of fluid sealing communication central cavity, part pipe wall of riser is configured to be connected with the first end cover, to limit filter core away from cover. In the technical scheme, by connecting riser with the first end cover, to limit filter core away from cover, maintain the sealing of the connecting place of riser and filter core. In addition, cover and riser are separate structure, can be accurately machined to the pipe wall of riser separately, reduce the processing difficulty and production cost of the riser with connecting structure.

Description

Technical Field

[0001] This utility model belongs to the field of filter technology, and in particular relates to a filter that is installed in the oil supply system of an automobile / truck engine by means of a threaded rotation. Background Technology

[0002] Filters are used to filter fluids associated with the operation of internal combustion engines; for example, filters can remove particulate matter from fuel and lubricants. Known filters for filtering fuel in automobile / truck engines include a housing with an opening, a filter element disposed within the housing, and a cover for closing the opening. The fuel to be filtered flows from the fuel tank into the dirty side of the filter, then through the filter element to the clean side of the filter element, and finally into the engine.

[0003] In the above-mentioned type of filter, the filter element is usually attached to the riser on the housing or cover, and a spring is used to compress the filter element, forcing it to be sealed to the riser through the elastic rubber seal at the end cap. If the connection between the filter element and the riser is broken (such as if the spring fails), the filter element will move away from the riser, thereby weakening the sealing performance between the two. Fuel containing particulate matter will mix with clean fuel, causing the filtration function to fail.

[0004] US Patent (Publication No.: US08083074B2) discloses a filter assembly including a housing and a nut plate, wherein a filter cartridge is disposed within an interior space of the housing, and a plurality of ribs are formed on the inner surface of the housing within the interior space; at least some of the ribs include positioning steps adjacent to a first end of the filter cartridge, the steps being spaced apart from the first end of the filter cartridge such that a gap exists between the steps and the first end of the filter cartridge, the steps being sized to engage with the first end to restrict movement of the filter cartridge away from the nut plate.

[0005] In some common sealing designs, after the filter cartridge is installed into the internal space of the housing, the housing and the nut plate are sealed by friction welding. Therefore, there is a gap between the step and the first end of the filter cartridge in the aforementioned patent. This prevents the step inside the housing from damaging the first end of the filter cartridge during rotational welding. However, the gap makes the filter cartridge unstable in the axial and radial directions. Especially when the size of the housing is large, the connection between the second end of the filter cartridge and the nut plate may move, causing the sealing effect to be compromised, thereby affecting the filtration function of the filter cartridge.

[0006] Currently, it is possible to consider designing a precise matching limiting structure for the riser and filter element end cap. However, existing filter housing designs typically involve injection molding the riser and nut plate as a single piece (such as patent US08083074B2), which makes the injection molding process or subsequent finishing of the limiting structure more complex. Utility Model Content

[0007] The main purpose of this utility model is to propose a spin-on filter, which aims to solve the technical problem that when improving the reliability of the connection between the riser and the filter element by designing a limiting structure for the riser, the existing filter housing design usually integrates the riser and the nut plate into one piece, which makes the injection molding process or finishing of the limiting structure of the riser more complex and difficult.

[0008] To achieve the above objectives, the present invention proposes a spin-on filter comprising a filter element and a filter chamber, wherein the filter element is located within the filter chamber, and wherein the filter element comprises an annular filter medium and a first end cap and a second end cap connected to both ends of the annular filter medium, and the annular filter medium has a central cavity defined around its central axis. The filter chamber includes a housing and a cover, the cover having an inflow channel for oil to enter the filter chamber; It also includes a riser connected to the cover, the riser having a fluid-sealed outflow channel communicating with the central cavity, and a portion of the riser wall being configured to connect to the first end cap to restrict the filter element from moving away from the cover.

[0009] Optionally, the first end cap is provided with a through hole for entering the central cavity, and a portion of the pipe wall of the riser is sealed to the through hole.

[0010] Optionally, the through hole has a hole wall that extends generally in the axial direction, and a portion of the riser wall is configured to interlock with the hole wall.

[0011] Optionally, a portion of the riser wall is connected to the hole wall in a hook-like manner.

[0012] Optionally, the hole wall is elastic.

[0013] Optionally, the inlet end is formed on the side of the inflow channel away from the housing, and the riser portion is located inside the inflow channel. When the riser is connected to the first end cap, its pipe wall is configured to form a stop with the inlet end.

[0014] Optionally, the riser is provided with a first positioning rib extending axially on the outside of its pipe wall, and the first positioning rib forms a stop with the inlet end.

[0015] Optionally, the riser is provided with a second positioning rib extending axially on the outside of its wall to limit unexpected radial deviation of the riser.

[0016] Alternatively, the cover and the riser are two separate components.

[0017] Optionally, the first end cap and part of the riser wall are connected by threads.

[0018] Optionally, the outer surface of the housing or the cover is provided with connecting threads for rotating the filter chamber.

[0019] In this invention, by designing a portion of the riser's wall to connect with the first end cap, a positioning connection between the riser and the filter element is achieved. This connection structure ensures a stable and sealed connection of the filter element to the riser even in the absence of a spring, effectively preventing the filter element from detaching from the cap, maintaining the seal at the connection between the riser and the filter element, and extending the filter element's lifespan. Furthermore, the cap and riser are separate structures, allowing for precise machining of the riser's wall independently, reducing the machining difficulty and production cost of risers with connecting structures. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a front view of an embodiment of the filter with positioning features provided by this utility model in an oil circuit; Figure 2 yes Figure 1 A cross-sectional view of the axial section of section AA; Figure 3 This is a three-dimensional structural diagram of an embodiment of a filter with positioning features provided by this utility model; Figure 4 yes Figure 3 Exploded view of the middle section of the structure; Figure 5 yes Figure 3 Exploded view of another part of the structure; Figure 6 yes Figure 3 Top view; Figure 7 yes Figure 6 Sectional view of section BB; Figure 8 yes Figure 2 Flow path diagram of fuel oil.

[0022] Labeling Explanation: Filter-1000, Filter Element-100, Annular Filter Media-1, Central Cavity-1a, First End Cap-2, Through Hole-2a, Hole Wall-21, Gap-21a, Second End Cap-3, Support Tube-4, Filter Chamber-200, Housing-201, Opening-201a, Cover-202, Passage-202a, Inflow Channel-202b, Outflow Channel-202c, Inlet End-2021, Limiting Rib-2022, Connecting Thread-2023, Riser-300, Stop Part-301, First Positioning Rib-302, Second Positioning Rib-303, Reinforcing Rib-304.

[0023] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] To better describe and illustrate the embodiments of this application, reference may be made to one or more accompanying drawings, but the additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the utility model creation, the embodiments or preferred embodiments of this application, or the preferred methods described herein.

[0026] In the description of this utility model, it should be noted that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate that the device referred to must have a specific orientation or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0028] In some fuel filters, the filter element is typically attached to a riser on the housing or cover, and a spring compresses the filter element to create a radial seal between it and the riser via an elastic rubber seal. If the spring loses its elasticity, the connection between the filter element and the riser can easily break, allowing particulate fuel to mix with clean fuel, resulting in filtration failure.

[0029] In view of this, the present invention provides a spin-on filter, which is generally installed in the oil circuit of a car / truck engine by means of a thread. Figure 1-8 This is an embodiment of the spin-on filter provided by this utility model. Please refer to [link / reference]. Figure 1-8 The filter 1000 includes a filter chamber 200 and a filter element 100 located within the filter chamber 200.

[0030] The filter chamber 200 includes a generally cylindrical housing 201 and a cup-shaped cover 202. An opening 201a is formed at one end of the housing 201. The cover 202 is generally sealed to the open end of the housing 201 by means of threaded connection or welding, thereby forming a cavity for filtering oil. Typically, the housing 201 and / or the cover 202 are provided with a fuel inflow passage 202b and an outflow passage 202c. In this embodiment, the inflow passage 202b and the outflow passage 202c are defined by the cover 202 and the riser 300. These two passages can receive the oil to be filtered flowing in from the fuel tank and can guide the filtered oil to the engine system.

[0031] In a more detailed description, the housing 201 and cover 202 can be made of any material suitable for a particular application (e.g., metal) in any suitable manner, such as by die casting and / or machining, and can be one or more pieces. In this embodiment, after the filter element 100 is installed in the filter chamber 200, the housing 201 and cover 202 are made into one piece by friction welding, achieving an absolute seal at the opening 201a, so that the entire filter 1000 can be a separate product. Of course, in other embodiments, it can also be designed as a detachable structure, so that the filter element 100 can be disassembled and replaced after the cover 202 is removed from the housing 201.

[0032] Please see Figure 2 and 5 The filter element 100 includes an annular filter medium 1 and a first end cap 2 and a second end cap 3 connected to both ends of the annular filter medium 1. Specifically, the annular filter medium 1 is generally cylindrical, and its interior has a cylindrical central cavity 1a formed around its central axis. The central cavity 1a and the outer side of the filter medium 1 constitute the clean side and the dirt-collecting side of the fuel, respectively. In other embodiments, the central cavity 1a and the outer side of the filter medium 1 may also serve as the dirt-collecting side and the clean side of the fuel, respectively.

[0033] Similar to some common filter cartridges 100, the filter medium 1 in this embodiment can be made by repeatedly folding filter paper or bonding multiple layers of filter cloth. In addition, the first end cap 2 and the second end cap 3 are generally disc-shaped and are made of elastomeric material or plastic by injection molding. They can be connected to both ends of the annular filter medium 1 by means of hot melt welding, adhesive bonding, etc.

[0034] The interior of the riser 300 forms a clean fuel outflow channel 202c. One end of the riser 300 is connected to the middle of the cover 202, and the other end can penetrate the first end cover 2 and connect to the central cavity 1a. The wall of the riser 300 can form a seal with the first end cover 2, and the outer wall portion has a shape that connects with the first end cover 2 to limit the filter element 100 from moving away from or detaching from the cover 202. It is foreseeable that these mating shapes with the first end cover 2 include one or more combinations of wedge-shaped fitting structures, snap-fit ​​structures, and threaded structures. These positioning structures confine the filter element 100 to the corresponding position in the filter chamber 200.

[0035] In other embodiments, the wall of the riser 300 can continue to extend within the central cavity 1a, and is connected to the second end cap 3 by means of its wall shape.

[0036] In the technical solution of this utility model, by designing a portion of the riser 300 wall to connect with the first end cap 2, a positioning connection between the riser 300 and the filter element 100 is achieved. This connection structure ensures that the filter element 100 is stably and sealed to the riser 300 even in the absence of spring abutment, effectively preventing the filter element 300 from detaching from the cap, maintaining the sealing at the connection between the riser 300 and the filter element 100, and extending the service life of the filter element 100. Furthermore, since the cap 202 and the riser 300 are separate structures, the wall of the riser 300 can be precisely machined independently, reducing the processing difficulty and production cost of risers 300 with connecting structures.

[0037] To ensure an effective seal at the connection between riser 300 and first end cap 2, please refer to [link / reference needed]. Figure 2 and 5 In one embodiment of this utility model, the center of the first end cap 2 is provided with a through hole 2a for entering the central cavity 1a. A portion of the pipe wall of the riser 300 is press-fitted with the through hole 2a to achieve radial sealing at the connection point. The through hole 2a is a circular hole, allowing the cylindrical outer wall of the riser 300 to make tight contact with it. Of course, the shape of the through hole 2a is not limited to this; it can be a square hole or other shapes.

[0038] Furthermore, the orifice wall 21, extending approximately axially, forms a through hole 2a. The orifice wall 21 and the first end cap 2 are integrally formed, and their material is elastic. A portion of the orifice wall 21 is evenly spaced with several gaps 21a along the axial direction, allowing the orifice wall 21 to elastically expand approximately radially outward when the riser 300 enters the through hole 2a. The inner diameter of a portion of the inner wall of the orifice wall 21 gradually contracts axially inward, while the outer diameter of a portion of the riser 300's wall gradually decreases axially inward. When the riser 300 is inserted into the through hole 2a, these two wedge-shaped surfaces come into close contact circumferentially, achieving an interference fit and forming a mating assembly to prevent movement at the connection between the filter element 100 and the riser 300.

[0039] The end of the riser 300 has a stop portion 301, which is located near the wedge-shaped surface of the outer wall of the riser 300 and forms an annular end face that extends approximately radially. When the wedge-shaped surfaces of the two parts are tightly pressed together, the radially extending end face of the end of the hole wall 21 is tightly connected to the end face of the stop portion 301, thereby causing the riser 300 and the hole wall 21 to fit together and restricting the movement of the hole wall 21 and the filter element 100 connected thereto away from the cover 202. At the same time, the fit of the two end faces also prevents the filter element 100 from moving towards the cover 202, and also achieves a certain axial sealing effect.

[0040] It should be noted that the hole wall 21 is elastic, and the stop portion 301 can expand the hole wall 21 and then connect to the end of the hole wall 21. It should be understood that the hole wall 21 is made of rubber or elastomer material, and is integrally injection molded or subjected to secondary injection molding with the first end cap 2.

[0041] In a further embodiment, the stop portion 301 is hooked into the end of the hole wall 21, that is, the stop portion 301 forms an inverted conical surface.

[0042] It should be understood that the sealing connection between the riser 300 wall and the through hole 2a is not limited to this. In other embodiments, the outer wall of the riser 300 and the hole wall 21 are press-fitted with an O-ring to achieve radial sealing; or an external thread is provided on the outer wall of the riser 300 and an internal thread is provided on the inner wall of the hole wall 21. When the internal and external threads are engaged, the risk of oil leakage is reduced by precise fit and radial clearance is reduced, thereby achieving a sealing effect.

[0043] It should be noted that the filter element 100 also includes a support tube 4 within the central cavity 1a. Please refer to [link / reference]. Figure 2 The two ends of the support tube 4 are connected to the first end cap 2 and the second end cap 3, which can prevent the filter medium 1 from collapsing.

[0044] Please see Figure 2 and 4In one embodiment of this utility model, a hollow cylindrical passage 202a is provided in the middle of the cover 202. The diameter of the passage 202a is larger than that of the riser 300. The riser 300 is partially located inside the passage 202a. The wall of the riser 300 separates the passage 202a into an outflow channel 202c for fluid leaving the filter chamber 200 and an inflow channel 202b for fluid entering the filter chamber 200. The interior of the riser 300 forms the outflow channel 202c for fuel leaving the filter chamber 200, and the passage 202a and the riser 300 form the inflow channel 202b for fluid entering the filter chamber 200.

[0045] Please refer to the fuel route. Figure 8 Fuel containing particulate matter in the tank first enters the inflow channel 202b, then passes through the filter medium 1 and enters the central cavity 1a after filtration. Clean fuel enters the outflow channel 202c through the riser 300 and finally leaves the filter chamber 200.

[0046] To achieve the connection between the riser 300 and the cover 202, the passage 202a of the cover 202 forms an inlet end 2021 on the side away from the housing 201. When part of the riser 300 is connected to the first end cover 2, the other part forms a stop with the inlet end 2021.

[0047] Specifically, please refer to Figure 7 The riser 300 has a first positioning rib 302 extending axially on the outer wall of the pipe. The first positioning rib 302 can form a stop with the inlet end 2021.

[0048] The inner wall of the cover 202 is connected to a limiting rib 2022, which can form a stop with the first end cover 2 of the filter element 100. The combination of the first positioning rib 302 and the limiting rib 2022 can effectively prevent the riser 300 from excessively extending into the through hole 2a during installation, which would cause the connection between the riser 300 and the hole wall 21 to fail. In addition, these two structures also make the positioning of the filter element 100 more stable.

[0049] Furthermore, to prevent movement between riser 300 and cover 202, please refer to... Figure 2 A second positioning rib 303 extending axially is connected to the outer periphery of the riser 300. The second positioning rib 303 abuts against the inner wall of the passage 202a to prevent the riser 300 from shifting in the passage 202a. The first positioning rib 302 and the second positioning rib 303 are connected together and are evenly distributed on the outer periphery of the riser 300.

[0050] Please see Figure 4 and 5It should be understood that, in one embodiment of this utility model, the riser 300 and the cover 202 are connected as two separate components, or they can be integrally molded by injection molding. The outer circumferential surface of the cover 202 is provided with connecting threads 2023, which can form a threaded engagement with the oil passage structure, thereby fixing the entire filter 1000 in the oil passage. O-rings that seal with the oil passage are installed on the outer circumference of the cover 202 and at the outlet of the outflow channel 202c of the riser 300.

[0051] When connecting thread 2023 corresponds to the internal thread in the engine oil passage, the O-ring seal at the outlet of flow channel 202c (i.e., the end of riser 300) will press against the oil passage structure. To prevent the end of riser 300 from being squeezed and deformed, resulting in a poor seal, please refer to [the relevant documentation]. Figure 2 The end of the riser 300 is also provided with a reinforcing rib 304, which is evenly distributed along the circumference to improve the rigidity of the riser 300 and prevent it from deforming.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above embodiments merely illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A spin-on filter, comprising a filter element (100) and a filter chamber (200), wherein the filter element is located within the filter chamber (200), characterized in that: The filter element (100) includes an annular filter medium (1), and a first end cap (2) and a second end cap (3) connected to both ends of the annular filter medium (1). The annular filter medium (1) has a central cavity (1a) defined around its central axis. The filter chamber (200) includes a housing (201) and a cover (202), the cover (202) having an inflow channel (202b) for oil to enter the filter chamber (200); It also includes a riser (300) connected to the cover (202), the riser (300) having an outflow channel (202c) fluid-sealed in communication with the central cavity (1a), and a portion of the riser (300) wall being configured to connect to the first end cap (2) to restrict the filter element (100) from moving away from the cover (202).

2. The spin-on filter of claim 1, wherein, The first end cap (2) is provided with a through hole (2a) for entering the central cavity (1a), and part of the pipe wall of the riser (300) is sealed to the through hole (2a).

3. The spin-on filter of claim 2, wherein, The through hole (2a) has a hole wall (21) that extends generally in the axial direction, and a portion of the pipe wall of the riser (300) is configured to fit into the hole wall (21).

4. The spin-on filter of claim 3, wherein, Part of the riser (300) wall is hooked to the hole wall (21).

5. The spin-on filter as described in claim 3, characterized in that, The hole wall (21) is elastic.

6. The spin-on filter as described in claim 1, characterized in that, The inlet end (2021) is formed on the side of the inflow channel (202b) away from the housing (201). The riser (300) is partially located in the inflow channel (202b). When it is connected to the first end cap (2), its pipe wall is configured to form a stop with the inlet end (2021).

7. The spin-on filter as described in claim 6, characterized in that, The riser (300) has a first positioning rib (302) extending axially on the outside of its pipe wall, and the first positioning rib (302) forms a stop with the inlet end (2021).

8. The spin-on filter as described in claim 6, characterized in that, The riser (300) has a second positioning rib (303) extending axially on the outside of its wall to limit the riser (30) from unexpected radial deviation.

9. The spin-on filter as described in claim 1, characterized in that, The first end cap (2) and part of the pipe wall of the riser (300) are connected by threads.

10. The spin-on filter as described in claim 1, characterized in that, The outer surface of the housing (201) or the cover (202) is provided with connecting threads (2023) for rotating the filter chamber (200).

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