Hard interference fit structure filter

Abstract

The present application relates to the technical field of filter, and discloses a filter with hard interference fit structure, wherein a filter module is embedded with a closed end of a shell through filter paper glue, instead of a closed end cover, to play a sealing role on the lower end of the filter module, so that the closed end cover and a supporting spring are omitted, the height of the shell is shortened, the oil flow to the area containing the supporting spring is avoided to form a turbulent flow, and the oil resistance is reduced; an open end cover comprises an injection cavity and a matching ring which are integrally and coaxially arranged, the injection cavity is sealed and bonded to the top end of the filter module through filter paper glue; a flange ring is inserted into the inner diameter of the matching ring to play a sealing role on the inner side and the outer side of the filter medium, so that an inner sealing ring is omitted; under the premise of ensuring the function of the filter and the interchangeability of each component part being unchanged, the number of parts is further reduced, the product weight is reduced, the assembly complexity is reduced, the design cost and the manufacturing cost are maximally reduced, so that the design cost and the manufacturing cost are both reduced, and the reliability and the environmental protection are improved.

Description

Technical Field

[0001] This invention relates to the field of filter technology, and more particularly to a filter with a rigid interference fit structure. Background Technology

[0002] In modern engine development, compact structure, low cost, lightweight design, and environmental friendliness are among the main evaluation indicators. Fuel or engine oil needs to pass through a filtration system to remove contaminants before entering the engine. The main component of the filtration system is the filter, with spin-on filters being the most widely used.

[0003] Traditional fuel filters or oil filters consist of multiple parts, including filter media, open end caps, closed end caps, support springs, inner sealing rings, outer shells, threaded cover plates, and outer sealing rings. Regardless of the type of product, current designs have drawbacks such as a large number of parts, large size, heavy weight, and complex assembly, resulting in high design and manufacturing costs. Summary of the Invention

[0004] The purpose of this invention is to provide a rigid interference fit filter that, while ensuring the filter function and maintaining the interchangeability of each component, further reduces the number of parts, lowers the product weight, shortens the housing height, and reduces oil resistance; reduces assembly complexity, lowers design and manufacturing costs, and improves reliability and environmental friendliness.

[0005] To achieve this objective, the present invention adopts the following technical solution: Rigid interference fit filter, including: The outer casing has an open end and a closed end; The filter module is configured as a hollow ring structure, and is coaxially placed inside the outer shell. The bottom end of the filter module is embedded with the closed end through filter paper adhesive. A threaded cover plate, comprising an integral and coaxially arranged cover plate body and a flanged ring, wherein the cover plate body has an oil inlet, the flanged ring is located on the inner ring of the cover plate body and is bent downward in a direction parallel to the axial direction of the cover plate body, the inner ring of the flanged ring is provided with connecting threads, and the hollow part of the flanged ring is configured as an oil outlet, the oil outlet being connected to the hollow part of the filter module; An open end cap includes an integral and coaxially arranged glue injection cavity and a mating ring. The glue injection cavity is sealed and bonded to the top of the filter module by filter paper glue. The mating ring is located in the inner ring of the glue injection cavity, and the inner ring of the mating ring is rigidly interference-fitted to the outer ring of the flange ring. An external sealing module is connected to the cover plate body, and the outer ring of the external sealing module is connected to the opening end.

[0006] As an optional technical solution for a rigid interference fit filter, the open end cap is configured as a disc-shaped stamped metal end cap, and the top of the mating ring is higher than the top of the glue injection cavity.

[0007] As an optional technical solution for a rigid interference fit filter, the cover plate body is inclined downward on the side near the flange ring, and the top of the mating ring is flush with the top of the glue injection cavity.

[0008] As an optional technical solution for a rigid interference fit filter, the open end cap is set as a plastic end cap.

[0009] As an optional technical solution for a rigid interference fit filter, the outer periphery of the open end cap is provided with multiple positioning protrusions at intervals, and the positioning protrusions all abut against the inner wall of the housing.

[0010] As an optional technical solution for a rigid interference fit filter, the bottom of the housing is provided with a constriction, the outer diameter of which is smaller than the outer diameter of the open end, and the bottom end of the filter module is inserted into the constriction.

[0011] As an optional technical solution for a rigid interference fit filter, the closed end is provided with an inner protrusion.

[0012] As an optional technical solution for a rigid interference fit filter, the filter module includes a filter medium and a central tube arranged coaxially. The central tube is disposed inside the filter medium and has multiple circumferential openings.

[0013] As an optional technical solution for a rigid interference fit filter, the filter medium is set as a paper core, which is made by winding filter paper around the central tube or by connecting V-shaped filter paper end to end.

[0014] As an optional technical solution for a rigid interference fit filter, the external sealing module includes a sealing ring seat and an outer sealing ring. The sealing ring seat is connected to the cover plate body. The sealing ring seat is provided with an outer ring seat and a sealing groove. The outer ring seat is connected to the open end, and the outer sealing ring is placed in the sealing groove.

[0015] The beneficial effects of this invention are: The rigid interference fit filter provided by this invention includes a housing, a filter module, a threaded cover plate, an open end cap, and an external sealing module. The housing has an open end and a closed end; the filter module is a hollow annular structure and is coaxially placed inside the housing for filtering dirty oil. The bottom end of the filter module is embedded in the closed end with filter paper adhesive, which seals the lower end of the filter module. In this application, the housing is used instead of the closed end cap, and the lower end of the filter module is directly embedded in the housing with filter paper adhesive, which eliminates the need for the closed end cap and the support spring, and the height of the housing can be further shortened; it can also prevent the oil from flowing into the area containing the support spring and forming turbulence, thereby reducing the resistance of the oil.

[0016] The threaded cover plate includes an integral and coaxially arranged cover plate body and a flanged ring. The cover plate body has an oil inlet. The flanged ring is located on the inner ring of the cover plate body and is bent downwards in a direction parallel to the axial direction of the cover plate body. The inner ring of the flanged ring has connecting threads for connecting the filter to the mounting base. The hollow part of the flanged ring is set as an oil outlet, which communicates with the hollow part of the filter module. The open end cover includes an integral and coaxially arranged glue injection cavity and a mating ring. The glue injection cavity is sealed to the top of the filter module by filter paper glue, which seals the top of the filter medium. The glue injection cavity is located below the cover plate body. The mating ring is located on the inner ring of the glue injection cavity. The flanged ring is inserted into the mating ring and there is a radial hard interference fit between the flanged ring and the mating ring, which seals the inner and outer sides of the filter medium. The hard interference fit structure filter design in this application forms a seal directly between the open end cover and the threaded cover plate by hard interference fit, eliminating the need for an inner sealing ring and further reducing the number of parts.

[0017] This rigid interference fit filter, while ensuring filter functionality and maintaining the interchangeability of all components, optimizes the existing filter structure, reducing the number of parts, shortening the product height, and lowering the product weight. It also simplifies assembly complexity, minimizing design and manufacturing costs, while improving reliability and enhancing environmental friendliness. Attached Figure Description

[0018] Figure 1 This is a cross-sectional schematic diagram of a rigid interference fit structure filter provided in a specific embodiment of the present invention; Figure 2 This is a cross-sectional schematic diagram of the housing of the rigid interference fit structure filter provided in a specific embodiment of the present invention; Figure 3 This is a schematic diagram of the oil circuit of a rigid interference fit filter provided in a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the outer shell structure in one embodiment of the rigid interference fit structure filter provided by the specific embodiments of the present invention; Figure 5 This is a cross-sectional schematic diagram of the housing, filter module, and open end cap in one embodiment of the rigid interference fit structure filter provided by the specific implementation of the present invention. Figure 6 This is a schematic diagram of the outer shell structure in another embodiment of the rigid interference fit structure filter provided in a specific embodiment of the present invention; Figure 7 This is a cross-sectional schematic diagram of the housing, filter module, and open end cap in another embodiment of the rigid interference fit structure filter provided in a specific embodiment of the present invention. Figure 8 This is a schematic diagram of the filter medium of the rigid interference fit structure filter provided in a specific embodiment of the present invention; Figure 9 This is a schematic diagram of the central tube of a rigid interference fit filter provided in a specific embodiment of the present invention; Figure 10 This is a schematic diagram of the threaded cover plate of the rigid interference fit filter provided in a specific embodiment of the present invention; Figure 11 This is a cross-sectional schematic diagram of the threaded cover plate of the rigid interference fit structure filter provided in a specific embodiment of the present invention; Figure 12 This is a cross-sectional schematic diagram of the open end cap of a rigid interference fit structure filter provided in a specific embodiment of the present invention; Figure 13 This is a schematic diagram of the structure of the open end cap in one embodiment of the rigid interference fit structure filter provided by the present invention; Figure 14 This is a schematic diagram of the threaded cover plate in another embodiment of the rigid interference fit structure filter provided by the present invention; Figure 15 This is a cross-sectional schematic diagram of the open end cap in another embodiment of the rigid interference fit structure filter provided in a specific embodiment of the present invention; Figure 16 This is a cross-sectional schematic diagram of the open end cap and threaded cover plate in another embodiment of the rigid interference fit structure filter provided in a specific embodiment of the present invention. Figure 17 This is a schematic diagram of the open end cap in another embodiment of the rigid interference fit structure filter provided by the present invention. Figure 18 This is a cross-sectional view of the open end cap and the filter module in another embodiment of the rigid interference fit structure filter provided in the specific embodiments of the present invention. Figure 19This is a schematic diagram of the sealing ring seat of the rigid interference fit filter provided in a specific embodiment of the present invention; Figure 20 This is a cross-sectional schematic diagram of the sealing ring seat of a rigid interference fit filter provided in a specific embodiment of the present invention.

[0019] In the picture: 100. Outer shell; 101. Open end; 102. Closed end; 110. Narrowing; 120. Inner protrusion; 210. Filter media; 220. Central tube; 300. Threaded cover plate; 301. Oil inlet; 302. Oil outlet; 303. Connecting thread; 310. Flanged ring; 400. Open end cap; 401. Positioning protrusion; 410. Mating ring; 420. Glue injection cavity; 510. Sealing ring seat; 511. Outer ring seat; 512. Sealing groove; 520. Outer sealing ring; 900, filter paper adhesive. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 or an electrical connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0024] like Figures 1 to 20 As shown, this invention discloses a rigid interference fit filter, comprising: a housing 100, a filter module, a threaded cover plate 300, an open end cap 400, and an external sealing module. The housing 100 is a cylindrical stamped part with an open end 101 and a closed end 102. The filter module is a hollow annular structure, coaxially placed inside the housing 100, used for filtering dirty oil. The bottom end of the filter module is fitted to the closed end 102 via filter paper adhesive 900, providing a seal to the lower end of the filter module.

[0025] In traditional structures, the lower end of the filter module is typically glued to a closed end cap. The rigid interference fit filter design in this application uses a portion of the outer shell 100 to replace the function of the closed end cap. The lower end of the filter module is directly glued to the outer shell 100 using filter paper adhesive 900, eliminating the need for a closed end cap. Similarly, in traditional structures, a support spring is provided between the closed end cap and the outer shell 100 to provide axial support for the filter module. In the rigid interference fit filter design of this application, after replacing the closed end cap with the outer shell 100, the filter module is axially fixed to the outer shell 100, eliminating the need for a support spring. Compared to the traditional structure where the outer shell 100 needs space to accommodate the support spring, this design, by eliminating the support spring and other components, allows for a further reduction in the height of the outer shell 100.

[0026] Understandably, in traditional structures, after the oil enters the filter, it flows towards the area housing the support spring, easily creating turbulence and increasing oil resistance. The rigid interference fit filter design in this application eliminates the space for the support spring, reducing turbulence and thus lowering oil resistance. Overall, while maintaining the interchangeability of all components, optimizing the existing filter structure not only reduces the number of parts, shortens the product height, and lowers the product weight, but also reduces assembly complexity. This results in reduced design and manufacturing costs, while simultaneously improving reliability and enhancing environmental friendliness.

[0027] In this embodiment, reference Figure 1 , Figure 8 and Figure 9The filter module includes a filter medium 210 and a central tube 220 arranged coaxially. The central tube 220 is located inside the filter medium 210 and provides support for the filter medium 210. The central tube 220 is a cylindrical part with multiple circumferential openings.

[0028] Specifically, the filter medium 210 is set as a paper core, which is generally made of filter paper wound around the central tube 220. Dirty oil can be filtered through layers of filter paper, and the balance between the oil filtration rate and the filter paper thickness needs to be considered; or the paper core is made of... Figure 8 The filter paper with a V-shaped pleat structure is made by joining the ends together. Its shape is similar to an accordion and it surrounds the outer perimeter of the central tube 220. The repeated pleats expand the filter contact surface, which helps to optimize the filtration rate.

[0029] In this embodiment, in order to achieve a sealed structure, the lower end of the filter medium 210 is first bonded to the filter paper adhesive 900. The filter paper adhesive 900 that can be demolded from the mold is selected. The bottom end of the filter medium 210 is cured and molded by the mold and then demolded. The cured filter paper adhesive 900 is inserted into the closed end 102. The curing distribution area of ​​the filter paper adhesive 900 is further reasonably controlled to avoid problems such as excessive glue overflow affecting the filtration rate or insufficient glue causing sealing failure, thus ensuring stable filtration function.

[0030] For example, the bottom end of the filter medium 210 can also be directly bonded to the closed end 102 by filter paper adhesive 900. By directly injecting the filter paper adhesive 900 between the bottom end of the filter medium 210 and the closed end 102 for bonding, the structure is stable and the sealing effect is excellent, and the assembly operation is simpler and more efficient.

[0031] In this embodiment, reference Figures 10 to 12 The threaded cover plate 300 is a disc-shaped stamped part, including an integral and coaxially arranged cover plate body and a flange ring 310. The cover plate body has an oil inlet 301. The flange ring 310 is located in the inner ring of the cover plate body and is bent downward in a direction parallel to the axial direction of the cover plate body. The inner ring of the flange ring 310 is provided with a connecting thread 303, which is used to connect the filter to the mounting base. The hollow part of the flange ring 310 is set as an oil outlet 302, which is connected to the hollow part of the filter module.

[0032] A novel open end cap 400 is designed, comprising an integral and coaxially arranged glue injection cavity 420 and a mating ring 410. The glue injection cavity 420 is sealed and bonded to the top of the filter module by filter paper adhesive 900, and the glue injection cavity 420 is located below the cover plate body. The mating ring 410 is located in the inner ring of the glue injection cavity 420, and the inner ring of the mating ring 410 can be rigidly interference connected to the outer ring of the flange ring 310.

[0033] The flanged ring 310 is inserted into the mating ring 410, and a radial hard interference fit is formed between them, which seals the inner and outer sides of the filter medium 210. The hard interference fit structure filter design in this application forms a seal between the open end cap 400 and the threaded cover plate 300 through a direct hard interference fit, eliminating the need for an inner sealing ring between the open end cap 400 and the threaded cover plate 300 in the traditional structure, thus reducing the number of parts.

[0034] like Figure 1 , Figure 19 and Figure 20 As shown, the outer sealing module includes a sealing ring seat 510 and an outer sealing ring 520. The sealing ring seat 510 is located above the threaded cover plate 300 and is a disc-shaped stamped part. The sealing ring seat 510 is connected to the cover plate body by welding or riveting. The sealing ring seat 510 is provided with an outer ring seat 511 and a sealing groove 512. The outer ring seat 511 is connected to the open end 101 and they interlock to ensure stable assembly. The outer sealing ring 520 is placed in the sealing groove 512 and is a circular rubber part. The outer sealing ring 520 abuts against the mounting base to seal the rigid interference fit structure filter and the mounting base.

[0035] Specifically, such as Figure 3 As shown, dirty oil (fuel or engine oil) enters the interior of the rigid interference fit filter through the oil inlet 301, flows outwards through the gap between the open end cap 400 and the threaded cover plate 300, continues to flow downwards through the gap between the open end cap 400 and the outer shell 100, then passes through the filter medium 210. After being filtered by the filter medium 210, the dirty oil becomes clean oil, then passes through the central tube 220, and finally flows out of the oil outlet 302 for use by downstream devices (combustion or lubrication).

[0036] This rigid interference fit filter further optimizes the product structure while ensuring filter functionality. It reduces the number of parts while maintaining product interchangeability, thus allowing for further reduction in product height and weight, and simplifies assembly. This minimizes design and manufacturing costs.

[0037] For example, when there is no means to control the coaxiality between the open end cap 400 and the outer shell 100 during assembly, a plurality of positioning protrusions 401 are evenly distributed at intervals on the outer periphery of the open end cap 400, and the plurality of positioning protrusions 401 abut against the inner wall of the outer shell 100, such as... Figure 13 As shown, this can improve the coaxiality between the open end cap 400 and the housing 100, making it easier for the threaded cover plate 300 to be inserted into the open end cap 400 and the housing 100.

[0038] In this embodiment, the open end cap 400 is set as a disc-shaped stamped metal end cap. Generally, the cover plate body of the threaded cover plate 300 is inclined upward on the side near the flange ring 310, and the top of the mating ring 410 should be higher than the top of the glue injection cavity 420.

[0039] In another embodiment, reference Figures 14 to 16 When the cover body of the threaded cover plate 300 tilts downwards on the side near the flange ring 310, and the flange ring 310 shifts further downwards, the top of the mating ring 410 and the top of the glue injection cavity 420 should remain flush so that after the mating ring 410 and the threaded cover plate 300 are mated together, there is still enough gap between them for dirty oil to flow.

[0040] In yet another embodiment, reference is made to... Figures 17 to 18 When customers require filters to be more environmentally friendly and lightweight, plastic end caps can be used instead of metal end caps as open end caps 400. The plastic sheet is then bonded to the top of the filter module to further reduce the weight of the rigid interference fit filter and lower the manufacturing cost.

[0041] like Figure 4 and Figure 5 As shown, when there is no means to control the coaxiality of the filter module and the housing 100 after bonding during the assembly process, a constriction 110 is provided at the bottom of the housing 100. The outer diameter of the constriction 110 is smaller than the outer diameter of the open end 101. The bottom end of the filter module is inserted into the constriction 110 of the housing 100, which reduces the gap between the outer periphery of the filter module and the inner wall of the housing 100, thereby improving the coaxiality between the filter module and the housing 100 and further facilitating the insertion of the threaded cover 300 into the open end cover 400 and the housing 100.

[0042] like Figure 6 and Figure 7 As shown, when the internal working pressure of the rigid interference fit structure filter is not very high, an inner protrusion 120 is provided at the closed end 102 at the bottom of the housing 100 to offset part of the filling area of ​​the filter paper adhesive 900. Under the premise that the relatively small internal pressure of the rigid interference fit structure filter will not deform the housing 100 and the inner protrusion 120, the amount of filter paper adhesive 900 can be effectively reduced.

[0043] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A rigid interference fit filter, characterized in that, include: The outer casing (100) is provided with an open end (101) and a closed end (102). The filter module is configured as a hollow ring structure, and the filter module is coaxially placed inside the outer shell (100). The bottom end of the filter module is embedded with the closed end (102) through filter paper glue. A threaded cover plate (300) includes an integral and coaxially arranged cover plate body and a flanged ring (310). The cover plate body has an oil inlet (301). The flanged ring (310) is located in the inner ring of the cover plate body and is bent downward in a direction parallel to the axial direction of the cover plate body. The inner ring of the flanged ring (310) is provided with a connecting thread (303). The hollow part of the flanged ring (310) is configured as an oil outlet (302). The oil outlet (302) is connected to the hollow part of the filter module. An open end cap (400) includes an integral and coaxially arranged glue injection cavity (420) and a mating ring (410). The glue injection cavity (420) is sealed and bonded to the top of the filter module by filter paper glue. The mating ring (410) is located in the inner ring of the glue injection cavity (420), and the inner ring of the mating ring (410) is rigidly interference-fitted to the outer ring of the flange ring (310). An external sealing module is connected to the cover plate body, and the outer ring of the external sealing module is connected to the opening end (101).

2. The rigid interference fit filter according to claim 1, characterized in that, The open end cap (400) is configured as a disc-shaped stamped metal end cap, and the top of the mating ring (410) is higher than the top of the glue injection cavity (420).

3. The rigid interference fit filter according to claim 1, characterized in that, The cover plate body is inclined downward on the side near the flange ring (310), and the top of the mating ring (410) is flush with the top of the glue injection cavity (420).

4. The rigid interference fit filter according to claim 1, characterized in that, The open end cap (400) is a plastic end cap.

5. The rigid interference fit filter according to claim 1, characterized in that, The outer periphery of the open end cap (400) is provided with a plurality of positioning protrusions (401) spaced apart, and the positioning protrusions (401) all abut against the inner wall of the outer shell (100).

6. The rigid interference fit filter according to claim 1, characterized in that, The bottom of the outer shell (100) is provided with a constriction (110), the outer diameter of the constriction (110) is smaller than the outer diameter of the open end (101), and the bottom end of the filter module is inserted into the constriction (110).

7. The rigid interference fit filter according to claim 1, characterized in that, The closed end (102) is provided with an inner protrusion (120).

8. The rigid interference fit filter according to claim 1, characterized in that, The filter module includes a filter medium (210) and a central tube (220) arranged coaxially. The central tube (220) is disposed inside the filter medium (210) and has a plurality of circumferential openings.

9. The rigid interference fit filter according to claim 8, characterized in that, The filter medium (210) is configured as a paper core, which is made by wrapping filter paper around the central tube (220) or by connecting V-shaped filter paper end to end.

10. The rigid interference fit filter according to any one of claims 1-9, characterized in that, The outer sealing module includes a sealing ring seat (510) and an outer sealing ring (520). The sealing ring seat (510) is connected to the cover plate body. The sealing ring seat (510) is provided with an outer ring seat (511) and a sealing groove (512). The outer ring seat (511) is connected to the opening end (101). The outer sealing ring (520) is placed in the sealing groove (512).

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