Rotary filter and assembling method thereof

Abstract

The invention discloses a spin-on filter and an assembling method thereof.The filter is rotationally installed in an engine oil way and comprises a filter chamber and a filter element located in the filter chamber, the filter element comprises an annular filter medium, a first end cover and a second end cover, and the first end cover and the second end cover are connected with the two ends of the annular filter medium; the annular filter medium is provided with a central cavity defined around the central axis of the annular filter medium; the filter chamber comprises a shell and a cover, the cover is provided with an inflow channel through which oil enters the filter chamber, and a positioning column is arranged on the inner end face of the shell and used for limiting the filter element to move in the direction away from the cover; the filter further comprises a vertical pipe connected with the cover, the vertical pipe is provided with an outflow channel communicated with the central cavity in a fluid sealing mode, and one end of the vertical pipe is connected with the positioning column. According to the scheme, through cooperation of the vertical pipe and the positioning column, movement of the filter element is limited, the sealing performance of the connecting position of the filter element and the vertical pipe is kept, meanwhile, the capacity of the filter chamber for bearing higher internal oil liquid pressure impact and resisting oil pressure pulse fatigue is improved, and the service life of the filter is effectively prolonged.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of filter, in particular to a spin-on filter and its assembling method. BACKGROUND

[0002] Filters can be used to filter fluids associated with the operation of an internal combustion engine, for example, filters can be used to remove particulates from fuel or lubricating oil. Known filters for filtering fuel in automotive / truck engines include a housing having an opening, a filter cartridge disposed within the housing, and a cover for closing the opening. Fuel to be filtered flows from a fuel tank into a dirty side of the filter, through the filter cartridge, to a clean side of the filter cartridge, and finally into the engine.

[0003] In the above type of filter, the filter cartridge is usually joined to a standpipe on the housing or cover and is pressed against the standpipe by a spring so as to be in sealing engagement with the standpipe by means of a resilient rubber seal. If the connection between the filter cartridge and the standpipe is broken (e.g. by spring failure), the sealing performance is reduced and fuel containing particulates can mix with clean fuel, resulting in a loss of filtration function.

[0004] US patent (publication number: US08083074B2) discloses a filter assembly including a housing and a nut plate, a filter cartridge is disposed within an interior space of the housing, the interior space of the housing forms a plurality of ribs on an inner surface of the housing; at least some of the ribs include positioning steps adjacent to a first end of the filter cartridge, the steps are spaced apart from the first end of the filter cartridge so that a gap exists between the steps and the first end of the filter cartridge, the steps are sized to engage the first end to limit movement of the filter cartridge away from the nut plate.

[0005] In some common sealing designs, after the filter cartridge is installed into the interior space of the housing, the housing and the nut plate are sealed by friction welding, therefore, the gap between the steps and the first end of the filter cartridge in the above patent prevents the steps inside the housing from damaging the first end of the filter cartridge when the housing is rotationally welded. However, the gap makes the filter cartridge unstable in 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 can be active, which can damage the sealing effect and affect the filtration function of the filter cartridge.

[0006] In addition, due to the absolute sealing of the friction welded housing, the housing and the nut plate will produce outward bulging deformation when they are subjected to a large internal oil pressure for a long time, especially during the oil pumping process, the repeated fluctuation of the internal pressure will intensify the deformation of the housing, which is prone to fatigue damage. Combined with similar structure designs in the prior art, the outward bulging deformation caused by the internal pressure will be more severe at the center position of the bottom end of the housing. SUMMARY

[0007] The main purpose of the present application is to provide a spin-on filter and an assembling method thereof, aiming to solve the technical problems of volume expansion outward and easy movement of the filter element and the standpipe connection when the bottom of the shell bears a large internal oil pressure.

[0008] To achieve the above-mentioned purpose, the spin-on filter provided by the present application comprises a filter element and a filter chamber, wherein the filter element is located in the filter chamber, the filter element comprises an annular filter medium and first and second end covers connected to both ends of the annular filter medium, and the annular filter medium has a central cavity defined around a central axis thereof; The filter chamber comprises a shell and a cover, the cover has an inflow passage for oil entering the filter chamber, and an inner end surface of the shell is provided with a positioning column for limiting the filter element from moving away from the cover; Further comprising a standpipe connected to the cover, the standpipe has an outflow passage in fluid-tight communication with the central cavity, and one end of the standpipe is configured to be connected to the positioning column.

[0009] Optionally, the first and second end covers are each provided with a through hole for entering the central cavity, the standpipe passes through the through hole and is connected to the positioning column.

[0010] Optionally, the end of the standpipe is connected to the positioning column by screwing.

[0011] Optionally, the through hole has a first hole wall distributed substantially in the axial direction, and a part of the outer wall of the positioning column is in sealing connection with the through hole.

[0012] Optionally, the through hole is configured with an end surface abutting against the end of the positioning column.

[0013] Optionally, the inflow passage forms an open end away from one side of the shell, and the pipe wall of the standpipe is configured to abut against the open end when the standpipe is connected to the positioning column.

[0014] Optionally, the pipe wall of the standpipe is externally provided with a first positioning rib plate distributed in the radial direction, and the first positioning rib plate abuts against the open end.

[0015] Optionally, the pipe wall of the standpipe is externally provided with a second positioning rib plate distributed in the radial direction, for limiting the standpipe from deviating radially beyond the expectation.

[0016] Optionally, the cover and the standpipe are two separate elements.

[0017] Optionally, the outer surface of the shell or the cover is provided with a connecting thread for spin-on installation of the filter chamber.

[0018] The application further provides an assembling method of the spin-on filter. connecting the filter element to the positioning column inside the shell; aligning the cover to the open end of the shell and performing friction welding; axially inserting the stand pipe into the inflow channel; continuously axially inserting the stand pipe into the filter element; finally connecting the stand pipe through the filter element and the positioning column.

[0019] In the technical scheme, the stand pipe with the oil outlet channel is connected to the positioning column in the shell, the stand pipe can cooperate with the positioning column to limit the radial movement of the filter element and the movement of the filter element away from the cover, the sealing of the connection between the filter element and the stand pipe is maintained, the connection structure of the stand pipe and the positioning column improves the ability of the filter chamber to withstand higher internal oil pressure impact and resist oil pressure pulse fatigue, and the service life of the filter is effectively prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the application, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative labor.

[0021] Figure 1 is a front view of an embodiment of the spin-on filter provided by the application in an oil circuit; Figure 2 is a sectional view of an A-A axial section in Figure 1 Figure 3 is a perspective structural view of an embodiment of the spin-on filter provided by the application; Figure 4 is an exploded view of Figure 3 Figure 5 is a perspective structural view of a filter element in Figure 3 Figure 6 is a perspective structural view of a shell in Figure 3 Figure 7 is another exploded view of Figure 3 Figure 8 is a flow path diagram of fuel in Figure 2

[0022] ​​​​​​Label explanation: spin-on filter-100, filter element-10, annular filter medium-11, central cavity-11a, first end cover-12, second end cover-13, through hole-12a / 13a, first hole wall-14, first section-14a, second section-14b, end face-15, second hole wall-16, support tube-17, filter chamber-20, inflow channel-20a, outflow channel-20b, shell-21, opening-21a, cover-22, positioning column-23, inlet end-24, connecting thread-25, internal thread-26, limiting rib-27, open end-28, riser-30, oil passage-30a, first positioning rib-31, second positioning rib-32, oil head-33, reinforcing rib-34, external thread-35, O-ring-40.

[0023] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0024] 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 some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0025] In order to better describe and illustrate the embodiments of the present application, one or more drawings can be referred to, but additional details or examples used to describe the drawings should not be considered as limiting the scope of any one of the inventions, the described embodiments or the preferred modes of the present application.

[0026] In the description of the present application, it should be noted that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the positional or locational relationship based on the positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate that the device must have a particular orientation or be operated in a particular orientation, and therefore should not be understood as limiting the present application.

[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 the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application.

[0028] In some common sealing designs, the filter cartridge is installed into the inner space of the housing, and then the housing and the nut plate are sealed by friction welding. In the patent US08083074B2, there is a gap between the step and the first end of the filter cartridge, which prevents the inner step of the housing from damaging the first end of the filter cartridge during the rotation 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 can be loose, which damages the sealing effect and affects the filtering function of the filter cartridge.

[0029] In view of this, the present application provides a spin-on filter, which is mainly installed in the oil circuit of the automobile / truck engine by thread rotation, Figures 1-8 An embodiment of the spin-on filter provided by the present application is shown in Figures 1-8 The filter 100 includes a filter chamber 20 and a filter element 10 located in the filter chamber 20.

[0030] An embodiment of the spin-on filter provided by the present application is shown in Figures 1-3 The filter chamber 20 is composed of a generally cylindrical housing 21 and a bowl-shaped cover 22. An opening 21a is formed at one end of the housing 21, which is limited by an opening end 28. The cover 22 is sealingly connected to the opening end 28 of the housing 21 by friction welding, thereby forming a cavity for assembling the filter element 10. Generally, the housing 21 and / or the cover 22 are provided with an inflow passage 20a and an outflow passage 20b. In this embodiment, the inflow passage 20a and the outflow passage 20b are limited by the cover 22 and a standpipe 30. The inflow passage 20a formed in the middle of the cover 22 can receive the oil to be filtered from the oil tank, and the outflow passage 20b formed in the inside of the standpipe 30 can guide the filtered oil to the engine system.

[0031] In more detailed description, the housing 21 and the cover 22 can be made of any material suitable for specific applications (such as metal) in one or more pieces by any appropriate method, such as by die casting and / or machining, etc. In this embodiment, the housing 21 and the cover 22 are made into one piece by friction welding after the filter element 10 is installed in the filter chamber 20, which realizes the absolute sealing at the opening 21a, so that the entire filter 100 can be used as a separate product. Of course, in other embodiments, it can also be designed as a detachable structure. After the cover 22 is removed from the housing 21, the filter element 10 can be disassembled and replaced.

[0032] An embodiment of the spin-on filter provided by the present application is shown in Figure 2 and 5, the filter element 10 comprises a ring-shaped filter medium 11 and a first end cover 12 and a second end cover 13 connected to both ends of the ring-shaped filter medium 11. Specifically, the ring-shaped filter medium 11 is substantially straight cylindrical, and has a cylindrical central cavity 11a formed around the central axis thereof inside, and the central cavity 11a (i.e. the inner side of the ring-shaped filter medium 11) and the outer side of the ring-shaped filter medium 11 constitute the clean side and the pollution side of the fuel respectively. In other embodiments, the central cavity 11a and the outer side of the ring-shaped filter medium 11 can also constitute the pollution side and the clean side of the fuel respectively.

[0033] Similar to some common filter elements 10, the filter medium 11 in this embodiment can be made of repeatedly folded filter paper or multiple layers of filter cloth bonded together. The first end cover 12 and the second end cover 13 are substantially disc-shaped, and are formed by injection molding of elastomer material or plastic, and can be connected to both ends of the ring-shaped filter medium 11 by hot melt welding, adhesive bonding or other means to close the central cavity 11a. It should be noted that the filter element 10 further comprises a support tube 17 inside the central cavity 11a, which is hollow to facilitate the passage of fuel, and is connected to the first end cover 12 and the second end cover 13 at both ends, which can prevent the filter medium 11 from collapsing inward.

[0034] Please refer to Figure 2 and Figure 6 , the bottom of the inner end surface of the shell 21 is provided with an axially distributed positioning column 23, the end of the positioning column 23 is opposite to the first end cover 12 of the filter element 10, thereby limiting the movement of the filter element 10 away from the cover 22. In this embodiment, the positioning column 23 is a cylinder, and the outer surface thereof can be engaged with the structure of the first end cover 12, so that the filter element 10 can be initially installed into the shell 21, and then the cover 22 and the open end 28 of the shell 21 are friction welded after the cover 22 is rotated, and after the welding is completed, the stand pipe 30 is installed into the filter chamber 20.

[0035] The inside of the stand pipe 30 forms an outflow channel 20b for clean fuel, please refer to Figure 2 In this embodiment, the stand pipe 30 is located in the inflow channel 20a formed by the cover 22, one end of the stand pipe 30 is connected to the cover 22, and the stand pipe 30 extends axially from the end towards the inside of the filter chamber 20, penetrates the second end cover 13 of the filter element 10 and communicates with the central cavity 11a inside the second end cover 13, and the pipe wall portion of the stand pipe 30 located in the central cavity 11a is hollow, forming a plurality of oil passages 30a, and the clean fuel in the central cavity 11a can enter the outflow channel 20b inside the stand pipe 30 from each oil passage 30a.

[0036] After the shell 21 and the cover 22 are friction welded, the filter element 10 in the filter chamber 20 needs to be accurately positioned, please refer to Figure 2In the present embodiment, the other end of the stand pipe 30 also penetrates the first end cover 12, and then is connected with the positioning column 23, so as to eliminate the radial movement of the filter element 10. It should be understood that the connection between the stand pipe 30 and the positioning column 23 includes threaded connection, clamping connection, interference fit, etc. In the present embodiment, the threaded connection is preferred, that is, an internal thread 26 is arranged in the inside of the positioning column 23, and an external thread 35 is arranged at the end of the stand pipe 30. When the stand pipe 30 is rotated, the stand pipe 30 and the positioning column 23 can be connected, and the filter element 10 is installed around the stand pipe 30. It is predictable that in other embodiments, an internal thread can also be arranged at the end of the stand pipe 30, and an external thread is arranged on the outer periphery of the positioning column 23.

[0037] In the present technical solution, by connecting the stand pipe 30 with the oil outlet channel and the positioning column 23 in the shell 21, the stand pipe 30 can cooperate with the positioning column 23 to limit the radial movement of the filter element 10 and the movement away from the cover 22, so as to maintain the sealing of the connection between the filter element 10 and the stand pipe 30. At the same time, the connection structure of the stand pipe 30 and the positioning column 23 also improves the ability of the filter chamber 20 to withstand higher internal oil pressure impact and resist oil pressure pulse fatigue, effectively prolonging the service life of the filter 100.

[0038] In order to effectively seal the connection between the stand pipe 30 and the first end cover 12 and the second end cover 13, please refer to Figure 4 and 5 The first end cover 12 and the second end cover 13 are both provided with a through hole 12a and a through hole 13a which enter the central cavity 11a, and the stand pipe 30 can penetrate the through hole 12a and be connected with the positioning column 23.

[0039] Further, in order to prevent the clean fuel in the central cavity 11a and the outside of the filter element 10 from leaking in the through hole 12a, the through hole 12a has a first hole wall 14 which is distributed in the axial direction. Please refer to Figure 5 The first hole wall 14 is divided into two sections, the first section 14a is the part for the stand pipe 30 to enter, and the hole diameter of the first section 14a is slightly larger than the size of the end of the stand pipe 30; the second section 14b is the part for the positioning column 23 to enter, and the hole diameter of the second section 14b is almost equal to the size of the positioning column 23.

[0040] Due to the threaded connection between the positioning column 23 and the end of the stand pipe 30, the size of the end of the stand pipe 30 is smaller than that of the positioning column 23, so the hole diameter of the first section 14a is smaller than that of the second section 14b.

[0041] In order to prevent the fuel from passing through the through hole 12a and weakening the filtering function, part of the outer wall of the positioning column 23 is sealingly connected with the through hole 12a. Please refer to Figure 2In the present embodiment, the first hole wall 14 is elastic, which enables the first section 14a to be in interference fit with the outer wall of the positioning column 23, thereby achieving radial sealing at the through hole 12a. Of course, the manner of sealing connection between the first hole wall 14 and the positioning column 23 is not limited to this, and in other embodiments, the outer wall of the first hole wall 14 and the positioning column 23 is connected by a sealing ring to achieve radial sealing.

[0042] It should be understood that the position of sealing connection is not limited to the above, and the connection between the first section 14a and the second section 14b of the first hole wall 14 is formed with an end face 15, which abuts against the end face of the end portion of the positioning column 23, especially under the extrusion of the stand pipe 30, forcing the end face 15 to tightly abut against the end face of the end portion of the positioning column 23 to achieve axial sealing. It should be noted that the radial sealing and the axial sealing can be selected in only one of the two manners, or in combination of the two. In the present embodiment, the positioning column 23 is only in radial sealing connection with the first hole wall 14.

[0043] In the present embodiment, the end face 15 is a circular annular face distributed along the radial direction. Of course, the shape of the end face 15 is not limited to this, and also includes a conical face, a spherical face, etc., to better contact the end face of the end portion of the positioning column 23.

[0044] Please refer to Figure 2 , the through hole 13a has a second hole wall 16 distributed along the axial direction, and the outer wall of the part of the stand pipe 30 is in sealing connection with the second hole wall 16. In the present embodiment, the second hole wall 16 is elastic, which enables it to be in interference fit with the outer wall of the part of the stand pipe 30, thereby achieving radial sealing at the through hole 13a. Of course, the manner of sealing connection is not limited to this, and in other embodiments, the outer wall of the first hole wall 14 and the positioning column 23 is connected by a sealing ring to achieve radial sealing.

[0045] In the present embodiment, the middle of the cover 22 is formed with an axial fuel inflow passage 20a, which is in the shape of a hollow cylinder, and a part of the stand pipe 30 is located in the inflow passage 20a, and the pipe wall separates the inflow passage 20a and the outflow passage 20b. Please refer to Figure 8 The fuel containing particles in the fuel tank first enters the inflow passage 20a, then passes through the filter medium 11 and enters the central cavity 11a after filtration, the clean fuel enters the outflow passage 20b through the oil passage 30a of the stand pipe 30, and finally leaves the filter chamber 20.

[0046] To achieve the connection between the stand pipe 30 and the cover 22, the outer side of the cover 22 (i.e. the side of the inflow passage 20a away from the shell 21) is formed with an inlet end 24, and the outer wall of the stand pipe 30 can be in abutment or have a gap with the inlet end 24.

[0047] Please refer to Figures 2-4The outer wall of the riser 30 is configured with a first locating rib 31, which is arranged close to the oil head 33 (i.e. the oil outlet end) of the riser 30. The first locating rib 31 is a thin plate integrally formed with the pipe wall, which is distributed approximately in the radial direction and has a stop surface capable of abutting against the open end 24.

[0048] In the present embodiment, the first hole wall 14 is in radial sealing connection with the outer surface of the locating column 23. When the outer thread 35 of the distal end (i.e. the end away from the oil head 33) of the riser 30 is rotationally connected to the inner thread 26 of the locating column 23, the first locating rib 31 abuts against the open end 24, but the end surface 15 does not abut against the end of the locating column 23, and there is a gap of less than 0.5 mm therebetween, i.e. the filter element 10 and the first end cover 12 thereof can move within the 0.5 mm gap between the end surface of the locating column 23 and the end surface of the riser 30.

[0049] As known, the filter chamber 20 will expand outward in volume when subjected to a relatively large internal oil pressure. In the prior art, the middle part (close to the locating column 23) of the filter chamber 20, particularly the shell 21, will expand outward more severely due to the internal oil pressure. In the present embodiment, the riser 30 is threadedly connected to the locating column, and the first locating rib 31 abuts against the open end 24. It is foreseeable that the riser 30 can effectively constrain the middle part (close to the locating column 23) of the shell 21 to expand outward more severely, thereby improving the ability of the filter chamber 20, particularly the shell 21, to withstand a higher impact of internal oil pressure and to resist oil pressure pulse fatigue.

[0050] In other embodiments, the first hole wall 14 is not in radial sealing connection with the outer surface of the locating column 23. When the outer thread 35 of the distal end (i.e. the end away from the oil head 33) of the riser 30 is rotationally connected to the inner thread 26 of the locating column 23, the first locating rib 31 has a gap of less than 0.5 mm with the open end 24. In this case, the end surface 15 abuts against the end of the locating column 23, achieving axial sealing connection. The above two designs provide assembly error for the installation of the riser 30.

[0051] As mentioned above, the filter chamber 20 will expand outward in volume when subjected to a relatively large internal oil pressure. In the present embodiment, the riser 30 is threadedly connected to the locating column, and the end surface 15 abuts against the end of the locating column 23, achieving axial end surface sealing connection. The first locating rib 31 has a gap of less than 0.5 mm or a manufacturing assembly tolerance with the open end 24. It is foreseeable that the riser 30 can effectively constrain the middle part of the shell 21 to expand outward more severely. In practical applications, the middle part (close to the locating column 23) of the shell 21 is constrained to expand within 0.5 mm, which can still achieve good results, thereby improving the ability of the filter chamber 20, particularly the shell 21, to withstand a higher impact of internal oil pressure and to resist oil pressure pulse fatigue.

[0052] Please refer to Figure 2 In the embodiment, the inner surface of the cover 22 is configured with the limiting ribs 27 distributed in the radial direction. Since the end surface 15 does not abut against the end surface 15 of the end of the positioning column 23, the filter element 10 can move in the axial direction in the gap. The limiting ribs 27 can prevent the filter element 10 from moving towards the cover 22. The first positioning ribs 31 and the limiting ribs 27 are combined to make the positioning of the filter element 10 more stable.

[0053] Further, to prevent the radial movement between the stand pipe 30 and the cover 22, please refer to Figures 2-4 The outer periphery of the wall of the stand pipe 30 is connected with the second positioning ribs 32 distributed in the radial direction. The second positioning ribs 32 abut against or have a small gap with the inner wall of the inflow passage 20a, thereby preventing the stand pipe 30 from deviating in the inflow passage 20a. The number of the first positioning ribs 31 and the second positioning ribs 32 is four, and they are uniformly distributed in the circumferential direction of the stand pipe 30. Each of the first positioning ribs 31 and the second positioning ribs 32 is connected correspondingly and extends in the axial direction, thereby guiding the fuel to flow in the inflow passage 20a.

[0054] Please refer to FIGS. 4 and 5. It should be understood that, to facilitate the friction welding of the filter chamber 20, in the embodiment, the stand pipe 30 and the cover 22 are connected as two separate elements. If the shell 21 and the cover 22 of the filter chamber 20 are detachable, the stand pipe 30 and the cover 22 can also be integrally formed by injection molding.

[0055] To enable the filter 100 to be installed in the oil circuit of the engine fuel supply system, the outer surface of the shell 21 or the cover 22 is provided with a connecting thread. In the embodiment, the outer periphery of the cover 22 is provided with an external thread, i.e., the connecting thread 25, which can be threadedly connected with the oil circuit structure, thereby fixing the entire filter 100 in the engine oil circuit.

[0056] Further, the outer periphery of the cover 22 and the outer periphery of the oil head 33 of the stand pipe 30, i.e., the outlet of the outflow passage 20b, are both provided with O-rings 40. When the connecting thread 25 of the cover 22 is connected with the internal thread of the engine oil circuit, the O-rings 40 seal the connection.

[0057] When the connecting thread 25 is connected with the internal thread of the engine oil circuit, the O-rings 40 of the outer periphery of the oil head 33 abut against the oil circuit structure. To prevent the oil head 33 from being extruded and deformed, please refer to Figure 3 and 4 The oil head 33 of the stand pipe 30 is further provided with the reinforcing ribs 34 uniformly distributed in the circumferential direction, to improve the rigidity of the stand pipe 30 and prevent the deformation of the stand pipe 30.

[0058] The application further provides an assembling method of the spin-on filter, the whole assembling process can be operated in a semi-automatic or automatic mode, and the involved equipment includes a manipulator, a motor, a conveying belt, a clamp tool and the like.

[0059] In step S10, the filter element 10 is connected to the positioning column 23 inside the shell 21.

[0060] In the embodiment, first, the shell 21 is fixed, the opening 21a can face any position, in the embodiment, the opening 21a faces upward, then the filter element 10 is transferred above the shell 21, and the filter element 10 is put into the shell 21 from the opening 21a by pressing axially, the axial pressure is continuously provided to the filter element 10, the through hole 12a of the first end cover 12 is press-connected to the positioning column 23 inside the shell 21, and the first hole wall 14 is in interference fit.

[0061] In step S20, the cover 22 is aligned with the opening end 28 of the shell 21 and is friction-welded.

[0062] In the embodiment, the cover 22 is transferred above the shell 21, then is moved axially to the opening end 28 of the shell 21, after the port of the cover 22 is aligned with the opening end 28, the cover 22 is connected by a motor or the like rotating driving device and is driven to rotate at high speed, at this time, the connection part of the cover 22 and the shell 21 is continuously friction-heated, then is melted and is connected as a whole.

[0063] In step S30, the vertical pipe 30 is axially inserted into the inflow channel 20a.

[0064] In the embodiment, the vertical pipe 30 is transferred above the cover 22, then is moved axially into the inflow channel 20a of the shell 21.

[0065] In step S40, the vertical pipe 30 is continuously axially inserted into the filter element 10.

[0066] In the embodiment, the vertical pipe 30 is inserted into the through hole 13a of the second end cover 13 by pressing axially, the pipe wall of the vertical pipe 30 is in interference fit with the second hole wall 16, the axial pressure is continuously provided to the vertical pipe 30, and the end part of the vertical pipe 30 starts to pass through the through hole 12a.

[0067] In step S50, finally, the vertical pipe 30 passes through the filter element 10 and is connected to the positioning column 23.

[0068] In the implementation, the end of the stand pipe 30 passes through the through hole 12a and stops pressing down after abutting to the end of the positioning column 23. The rotating driving device such as a motor is connected to the stand pipe 30 and drives it to rotate slowly. At this time, the external thread 35 of the end of the stand pipe 30 is screwed into the internal thread 26 of the positioning column 23, and the stand pipe 30 is moved downward until the first positioning rib plate 31 of the stand pipe 30 abuts to the inlet end 24 of the cover 22, that is, the assembly is completed.

[0069] The technical features of the above embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not contradict, they should be considered as the scope of the description.

[0070] The above embodiments only express several implementation manners of the application, the description is more specific and detailed, but it should not be understood as the limitation of the patent scope of the application. It should be pointed out that for ordinary skilled in the art, several modifications and improvements can be made without departing from the concept of the application, which are all within the protection scope of the application. Therefore, the patent protection scope of the application should be subject to the appended claims.

Claims

1. A spin-on filter, comprising a filter element (10) and a filter chamber (20), wherein the filter element (10) is located within the filter chamber (20), characterized in that: The filter element (10) includes an annular filter medium (11), a first end cap (12) and a second end cap (13) connected to both ends of the annular filter medium (11), and the annular filter medium (11) has a central cavity (11a) defined around its central axis. The filter chamber (20) includes a housing (21) and a cover (22). The cover (21) has an inflow channel (20a) for oil to enter the filter chamber (20). The inner end face of the housing (21) is provided with a positioning post (23) to restrict the filter element (10) from moving away from the cover (22). It also includes a riser (30) connected to the cover (22), the riser (30) having an outflow channel (20b) that is fluid-sealed in communication with the central cavity (11a), one end of which is configured to be connected to the positioning post (23).

2. The spin-on filter as described in claim 1, characterized in that, The first end cap (12) and the second end cap (13) are both provided with through holes (12a, 13a) for entering the central cavity (11a). The riser (30) passes through the through holes (12a, 13a) and is connected to the positioning post (23).

3. The spin-on filter as described in claim 1 or 2, characterized in that, The end of the riser (30) is connected to the positioning post (23) by a thread.

4. The spin-on filter as described in claim 2, characterized in that, The through hole (12a) has a first hole wall (14) that is generally distributed along the axial direction, and a portion of the outer wall of the positioning post (23) is sealed to the first hole wall (14).

5. The spin-on filter as described in claim 2, characterized in that, The through hole (12a) is constructed with an end face (15) that forms a stop with the end of the positioning post (23).

6. The spin-on filter as described in claim 1, characterized in that, The inflow channel (20a) forms an open end (24) on the side away from the housing (21), and when the riser (30) is connected to the positioning post (23), its pipe wall is configured to form a stop with the open end (24).

7. The spin-on filter as described in claim 6, characterized in that, The riser (30) has a first positioning rib (31) distributed radially on the outside of the pipe wall, and the first positioning rib (31) and the opening end (24) form a stop.

8. The spin-on filter as described in claim 1, characterized in that, The riser (30) is provided with a second positioning rib (32) distributed radially on the outside of the pipe wall to limit the riser (30) from unexpected radial deviation.

9. The spin-on filter as described in claim 1, characterized in that, The cover (22) and the riser (30) are two separate components.

10. The spin-on filter as described in claim 1, characterized in that, The outer surface of the housing (21) or the cover (22) is provided with connecting threads (25) for rotating the filter chamber (20).

11. A method for assembling a spin-on filter as described in any one of claims 1-10, characterized in that, The assembly method includes the following steps: Connect the filter element (10) to the positioning post (23) inside the housing (21); Align the cover (22) with the opening end (28) of the housing (21) and perform friction welding; The riser (30) is extended axially into the inflow channel (20a); Continue inserting the riser (30) axially into the filter element (10); Finally, the riser (30) passes through the filter element (10) and connects to the positioning column (23).

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