Improved rotary filter
By using non-metallic materials and a filter element cover with an anti-rotation structure and limiting protrusions, the problem of zinc plating peeling off in spin-on filters has been solved, achieving more efficient filtration and reduced production costs.
Patent Information
- Application Number
- CN202511576402.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-30
- Publication Date
- 2026-01-23
AI Technical Summary
The galvanized layer or metal of existing spin-on filters is prone to falling off during the screwing process, causing the debris to enter the engine or fuel system, resulting in wear and performance degradation.
The filter element cover and irregularly shaped nut are made of non-metallic materials, combined with anti-rotation structure and limiting protrusions to prevent the zinc plating layer from falling off, and the production cost and difficulty are reduced by injection molding.
It effectively prevents galvanized layers or metal debris from entering the engine, extends the life of parts, reduces production costs and mechanical vibration, and improves filtration efficiency and sealing.
Smart Images
Figure CN121382379A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of filter, in particular to an improved spin-on filter BACKGROUND
[0002] The filter refers to the device or assembly that separates the solid particles in the fluid through the porous material, which is usually used in the automotive field and is the engine accessory. The fuel or oil needs to pass through the filter system to remove the pollutants before entering the engine or hydraulic system, and the main part of the filter system is the filter. The most typical and widely used one is the spin-on filter.
[0003] The spin-on filter usually includes a shell, a threaded cover plate component, a filter core component, a supporting spring and a sealing ring. The shell is generally open at the upper end and sealed at the lower end, the threaded cover plate component is composed of a sealing ring fixing plate and a threaded cover plate stacked together, the center of the sealing ring fixing plate has an oil hole and an annular groove on the upper side for clamping the sealing ring, and the sealing ring is clamped in the annular groove; the center of the threaded cover plate has a threaded interface for connecting with the engine, and a plurality of oil holes are evenly distributed in the central region, the threaded cover plate is placed in the shell, and the sealing ring fixing plate is connected with the upper end of the shell by riveting with a curled edge to form a sealing ring. The spin-on filter is installed on the engine through the threaded interface of the threaded cover plate, and can be used, and this installation method is commonly used in the fuel, lubricating system or hydraulic filter system of the engine. When in use, the oil or fuel of the engine enters the inner cavity of the shell through the oil hole of the threaded cover plate, and then returns to the oil channel of the engine after being filtered by the filter core component.
[0004] The material of the threaded cover plate is usually hot-rolled steel plate with a thickness of 2-5mm, and sometimes cast aluminum is also used. In order to prevent rust, the surface is usually treated with zinc plating. However, the zinc plating layer at the threaded part will be worn off and fall off when the threaded cover plate is screwed onto the engine, which will cause the fallen zinc plating layer or metal chips to enter the downstream of the filter. If it is an oil filter, the fallen zinc plating layer or metal will flow into the oil channel of the engine, causing wear to the moving parts of the engine and shortening the service life of the engine. If it is a fuel filter, the fallen zinc plating layer will flow into the fuel system, causing wear to the fuel injection nozzle of the high-pressure common rail, affecting the oil spray atomization effect, incomplete combustion and black smoke from the exhaust of the automobile. SUMMARY
[0005] The purpose of the present application is to provide an improved spin-on filter to solve the problem of zinc plating layer or metal falling off in the prior art, which makes the incineration of the filter core and the recycling of the metal parts more simple and efficient.
[0006] To achieve the above purpose, the present application provides the following technical scheme: An improved spin-on filter, comprising a shell, a cover plate assembly, a filter element assembly with a threaded interface, the cover plate assembly comprising a sealing ring, a fixing plate and a cover plate, the cover plate being provided with a central hole and a plurality of oil holes; The filter element assembly comprises a central tube and a filter element upper cover and a filter element lower cover connected to both ends of the central tube, the filter element upper cover having a threaded interface for communicating with an engine oil circuit or a hydraulic circuit; The cover plate and the filter element upper cover are provided with matched rotation stopping structures.
[0007] Preferably, the threaded interface of the filter element upper cover is a profiled nut, which is any shape matched with the shape formed in the cover plate, the profiled nut being integrally formed with the filter element upper cover, and both the profiled nut and the filter element upper cover being non-metallic.
[0008] Preferably, the outer periphery of the profiled nut is a partial rotation stopping structure, the inner wall of the profiled nut is provided with threads, and the central hole in the cover plate cooperates with the filter element upper cover and the profiled nut through the rotation stopping structure.
[0009] Preferably, the rotation stopping structure of the profiled nut comprises a non-circular hole polygonal contour, an irregular contour, a key connection, a limiting assembly, to prevent rotation between the cover plate and the profiled nut.
[0010] Preferably, the shape and size of the central hole are consistent with those of the profiled nut, the inner side of the cover plate is provided with a bevel, and the oil holes are arranged on the bevel and uniformly distributed on the outer periphery of the central hole.
[0011] Preferably, the outer periphery of the profiled nut is provided with at least two groups of limiting protrusions, the limiting protrusions protrude outward, each group of limiting protrusions is provided with at least two limiting protrusions, and the limiting protrusions are located at the same end face of the profiled nut.
[0012] Preferably, the limiting protrusions are clamping points, the clamping points are arc-shaped, and the distance between the clamping points and the bottom of the profiled nut is greater than the thickness of the inner wall of the cover plate.
[0013] Preferably, a filter paper is mounted on the outer periphery of the central tube, and a supporting member is movably connected to the bottom of the filter element lower cover; The supporting member comprises a sponge body or an elastic body, is used for supporting the filter element assembly, increases the sealing between the cover plate and the filter element upper cover by elastic support, and can effectively reduce mechanical vibration of the filter element, so as to realize noise reduction and improve filtering efficiency.
[0014] Compared with the prior art, the improved spin-on filter has the following beneficial effects: 1. The filter core upper cover with threaded interface is made of non-metallic material, which can effectively avoid the problem of zinc coating falling off or metal falling off at the threaded part, and also can avoid the problem of metal particles falling off due to damage of the screw thread during installation of the special-shaped nut, entering the engine and accelerating the wear of the fuel nozzle and other parts. The non-metallic material such as plastic is not easy to produce debris, so that the fuel or oil entering the engine after passing through the filter will not cause wear to the nozzle and other parts. At the same time, the non-metallic part makes the treatment and incineration of the filter core easier, and reduces the overall weight of the spin-on filter, improves the vibration fatigue life.
[0015] 2. There are many types of threaded interfaces of the spin-on filter, and the cover plate assembly can be shared by using the present application, only the filter core upper cover with threaded interface needs to be developed. Since the material of the filter core upper cover is non-metallic, it is easier to produce, and the cover plate assembly can be used as a universal part, without considering the type of threaded interface for batch production, reducing the cost of production and research and development, and reducing the mechanical vibration of the filter core to reduce noise and improve filtering efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 is a schematic diagram of the three-dimensional structure of the present application; Figure 2 is a schematic diagram of the half-section structure of the present application; Figure 3 is a schematic diagram of the exploded structure of the present application; Figure 4 is a schematic diagram of the filter core seat and outer cover structure of the present application; Figure 5 is a schematic diagram of the half-section structure of the second embodiment of the present application; Figure 6 is a schematic diagram of the structure of the filter core seat and outer cover of the second embodiment of the present application; Figure 7 is a schematic diagram of the filter core upper cover and outer cover of the second embodiment of the present application Figure 8 is a schematic diagram of the oil passage structure of the present application; Figure 9 is a schematic diagram of the half-section structure of the traditional filter of the present application; Figure 10 is a schematic diagram of the exploded structure of the filter core seat and outer cover of the traditional filter of the present application.
[0017] In the figure: 10, outer shell; 20, cover plate assembly; 201, sealing ring; 202, sealing ring fixing plate; 203, cover plate; 2031, oil hole; 2032, center hole; 30, filter core assembly; 301, filter core upper cover; 302, special-shaped nut; 3021, rubber ring; 303, filter paper; 304, filter core lower cover; 305, support spring; 306, center tube; 31, sealing gasket; 40, clamping point. Detailed Implementation
[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1
[0019] like Figures 1-4 As shown, the filter includes a housing 10, a cover assembly 20, and a filter element assembly 30. The cover assembly 20 is fixedly installed at one end of the housing 10, and the filter element assembly 30 is located inside the housing 10. The cover assembly 20 includes a sealing ring 201, a sealing ring fixing plate 202, and a cover plate 203. The sealing ring fixing plate 202 and the cover plate 203 are fixed together by welding before the filter is assembled. The cover plate 203 has an oil hole 2031 and a central hole 2032, wherein the central hole 2032 is located in the middle of the cover plate 203, and the oil hole 2031 is located in the center. The outer periphery of the hole 2032 is provided with at least two holes 2031, which are evenly distributed. The shape and size of the central hole 2032 are consistent with the irregular nut 302. The inner part of the cover plate 203 is set with a slope, and the oil holes 2031 are set on the slope. The slope is inclined to the side of the filter element assembly, so that a certain space is formed at the oil inlet, which facilitates the oil to enter evenly from multiple oil holes 2031. The oil inlet is uniform, avoiding clogging caused by long-term filtration on one side of the filter element. The filter element assembly 30 includes a filter element upper cover 301, filter paper 303, and filter element lower cover 30. 4. A shaped nut 302 is provided on the filter element upper cover 301. One end of the filter element upper cover 301 is provided with a sloping step, which, when engaged with the inclined part of the cover plate 203, forms a chamber at the inlet, isolating it from the outlet. The shaped nut 302 has internal threads. The shaped nut 302 is made of the same material as the filter element upper cover 301 and the filter element lower cover 304, which can be one of rubber, resin, plastic, etc., preferably plastic. Plastic has strong plasticity, is not corroded by most oils, and has a long service life. The materials of the sealing ring fixing plate 202 and the cover plate 203 are also consistent. The filter is made of metal, preferably iron or stainless steel. The outer edge of the cover plate 203 and the edge of the outer shell 10 can be assembled by pressing the edge, or by screwing and snapping. The assembled filter is screwed onto the connecting seat by the internal special-shaped nut 302. When it needs to be replaced, the filter can be directly screwed on for complete replacement. The oil pumped out by the oil pump will enter the inner shell 10 through the oil hole on the outer ring of the cover plate assembly 20, then permeate the filter paper 303 into the filter element, and finally be output to the fuel injector through the middle oil hole.
[0020] In traditional filters, such as Figure 9 andFigure 10 As shown, the profiled nut 302 is integrally formed with the cover plate 203, and is a threaded cover plate, both of which are metal products, and a sealing gasket 31 is further arranged between the cover plate 203 and the filter element upper cover 301, and the sealing gasket 31 is compressed by the support of the bottom support spring, thereby providing the sealing between the cover plate and the filter element upper cover in the filter, and during the screwing process when the filter is installed, friction will be generated between the threads, and since the material of the cover plate 203 is a metal product, preferably hot-rolled steel plate, a zinc plating layer is usually needed to be sprayed thereon for rust prevention, and the screwing friction will cause the zinc plating layer to fall off, and the connecting port between the connecting seat and the filter is at the outlet, so the falling object will fall into the filter element, and when the filter is applied in the fuel system, the falling object will enter the fuel oil into the injection nozzle, and when the falling object enters the injection hole of the injection nozzle, the texture of the falling object is relatively hard, and mutual friction will be generated between the falling object and the parts, which will cause the current parts to be worn, thereby reducing the service life and the poor oil injection atomization effect, and when the filter is applied in the oil filter, the falling object will enter the oil into the parts that need to be lubricated, and when the falling object enters the injection hole of the injection nozzle, the texture of the falling object is relatively hard, and mutual friction will be generated between the falling object and the parts, which will cause the current parts to be worn, thereby reducing the service life.
[0021] The special-shaped nut 302 is integrally formed with the filter element upper cover 301, and the outer periphery of the special-shaped nut 302 is a rotation-stopping structure. The inner wall of the special-shaped nut 302 is provided with a thread. The central hole 2032 in the cover plate 203 cooperates with the rotation-stopping structure of the special-shaped nut 302. The rotation-stopping structure of the special-shaped nut 302 includes one of a polygonal contour hole, an irregular contour hole, a limiting assembly, a key connection, etc., and is mainly used to limit the relative rotation between the special-shaped nut 302 and the central hole 2032. Preferably, the special-shaped nut is a hexagonal nut. The six planes of the hexagonal nut cooperate with the central hole, that is, the central hole is also provided with the corresponding six planes. The planes abut against each other, thereby preventing the relative rotation between the special-shaped nut 302 and the central hole 2032. The filter element upper cover 301 is fixed with a central tube 306 between the filter element upper cover 301 and the filter element lower cover 304. The filter paper 303 is installed on the central tube 306. The filter element lower cover 304 is further movably connected with a supporting assembly at the bottom. The supporting assembly includes a sponge body (fluid compatible closed-cell foam) or an elastic body. Most of the sponge bodies are hard sponges. The elastic body is generally a metal spring or a plastic spring, etc. They all have elasticity and can be used to support the filter element assembly 30 and reduce the mechanical vibration of the filter element to reduce noise and improve filtering efficiency. The elastic support makes the cover plate 203 and the filter element upper cover 301 tightly cooperate, thereby increasing the sealing property between the cover plate 203 and the filter element upper cover 301. That is, the supporting assembly can be an elastic structure such as a sponge and a supporting spring 305, which is used to support the entire filter element assembly 30 and make it suspended in the housing 10. Moreover, after the cover plate assembly 20 is pressed down, the filter element assembly 30 can be effectively prevented from shaking by the elastic support of the supporting spring 305. The special-shaped nut 302 is integrally formed with the filter element upper cover 301, and both of them are plastic products. Therefore, the special-shaped nut 302 does not need to be sprayed with a zinc plating layer for rust prevention. However, the filter still needs to be screwed on the connecting seat through the special-shaped nut 302. In order to avoid the synchronous rotation of the filter element upper cover 301 and the connector during the screwing process, a rotation-stopping structure is needed to limit the filter element assembly 30, so that the filter can be smoothly screwed on the connecting seat. The thread on the plastic special-shaped nut 302 is not easy to produce debris when being screwed. (Since it is a plastic material, a small amount of powdery or filamentous debris may be produced during multiple screwing processes. However, the hardness of the material is much smaller than that of metal. Therefore, during the process of oil circulation lubrication, it will not cause wear and tear to the internal engine.) The plastic special-shaped nut will not cause the risk of part wear and tear. Moreover, the strength of the special-shaped nut will decrease when it is changed from a metal product to a plastic product. The hexagonal nut in the rotation-stopping structure can be provided with a reinforcing rib on each edge. The reinforcing rib is made of engineering plastic (nylon, ultra-high molecular weight polyethylene) and carbon fiber, etc. It has high strength and good wear resistance, and can be used to increase the overall structural strength of the nut.
[0022] Therefore, the special-shaped nut 302 is replaced from the cover plate 203 to the filter core upper cover 301, and the material of the special-shaped nut 302 is changed from metal to plastic by integrally formed by injection molding. When the filter is screwed to the connecting seat, it is not easy to produce debris, so when the oil passes through the filter and enters the engine of the automobile, it will not cause wear to the injection hole and other automobile parts. Moreover, after the special-shaped nut 302 is changed to be integrally arranged with the filter core upper cover 301, the production difficulty and production cost can be greatly reduced.
[0023] Working principle: as Figure 8 shown, the fuel or oil pumped by the oil pump enters the housing through the oil inlet pipe interface (i.e. the oil hole 2031), penetrates the filter paper and enters the filter paper inner cavity, and finally is output to the oil nozzle through the oil outlet pipe interface (i.e. the special-shaped nut 302). During assembly, the filter core assembly can be placed in the shell 10, and then the cover plate assembly 20 is placed on the cover. The cover plate assembly is tightly fixed on the shell 10 by using the edge pressing process to form an integral whole, and then the special-shaped nut 302 with a threaded structure is screwed onto the engine. Moreover, when the filter is replaced, the whole needs to be replaced. Embodiment 2
[0024] As Figures 5-7 shown, on the basis of embodiment one, the outer periphery of the special-shaped nut 302 is provided with at least two sets of limiting protrusions. The limiting protrusions protrude outward and are used to fixedly install the filter core assembly on the cover plate assembly. Each set of limiting protrusions is provided with at least two limiting protrusions, and all the limiting protrusions are located on the same end surface of the special-shaped nut 302. The limiting protrusions are preferably two sets, which are respectively arranged on the symmetrical surfaces of the hexagonal nut, and each surface is provided with two limiting protrusions. The limiting protrusions are made of the same material as the special-shaped nut 302 and are integrally formed. The limiting protrusions are protruding structures with a small interference amount, and are preferably clamping points 40. The clamping points 40 are arranged in an arc shape and will not easily separate under the action of external force. When external force is applied, the clamping points 40 can be easily separated and installed. The distance between the clamping points 40 and the bottom of the special-shaped nut 302 is greater than the thickness of the inner wall of the cover plate 203, and the difference is 0.05mm-0.1mm. After assembly, the filter core assembly will not easily produce radial shaking.
[0025] And the card point 40 can also be outwardly over-protruding, in the assembly can be through the metal cover plate 203 40, the remaining 40 is scraped off the excess, just make the cover plate 203 and the special nut between the tight fit, can avoid in the process of assembly cover plate 203 and the special nut 302 between the shake, lead to the assembly is not convenient, also can be after the handling or moving keep the special nut 302 is in the filter on the vertical line of the center, facilitate installation to the engine, compared to the first embodiment deleted in the filter cartridge assembly 30 support member, the special nut 302 is directly pressed into the cover plate 203 through the card point 40 to the filter cartridge assembly 30 is limited, the filter cartridge assembly 30 can be connected to the cover plate 203, directly replace the role of the support spring 305, because of the replacement of the support spring 305, so there will be part of the activity space in the filter bottom, after the filter assembly is completed, in the process of transportation and movement, the filter cartridge and the special nut 302 will be reciprocating in the activity space, thereby causing the special nut 302 wear, lead to the sealing property reduces, and through the card point 40 can limit and fixed well the special nut 302, avoid its random activity, can guarantee its sealing property, in the first embodiment, because in the process of filter assembly need to be supported spring buckle in the filter cartridge assembly bottom, so increase a step, and in the second embodiment of the filter assembly filter cartridge, can be through the cover plate assembly 20 filter cartridge assembly 30 is assembled together to form a combination of parts, through the combination of direct installation on the shell 10, edge sealing can be done, so through the setting of the card point 40 can greatly save the cost and reduce the assembly time problem, in the function of the filter without affecting, save the assembly time, make its assembly more convenient.
[0026] Working principle: in this embodiment, the special nut 302 is provided with a limit block, so in the installation, can first be through the limit block buckle filter cartridge assembly is installed on the cover plate assembly 20, then together through the edge pressing process is installed on the shell 10, when the filter is screwed to the engine, the sealing ring 201 on the filter will be closely matched with the parts on the engine, and in the process of rotation, the threaded fittings on the engine and the special nut screw together, then gradually tighten the filter cartridge cover 301 close to the cover plate 203, make the filter cartridge cover 301 and the cover plate 203 between the more closely matched, thereby increasing the sealing property between the two, so in this application filter is installed on the engine, without the support of the card point or support spring can also keep the stability of the filter cartridge assembly.
[0027] In conclusion, the improved spin-on filter replaces the special-shaped nut from the cover plate to the filter core cover, and after the integral molding, the material of the special-shaped nut is changed from metal products to plastic products. When the filter is spin-on to the connecting seat, it is not easy to produce debris, so that the fuel or oil passing through the filter into the engine of the car will not cause wear to the nozzle and other parts. Moreover, after the special-shaped nut is changed to be integrally arranged with the filter core cover, the production difficulty and cost can be greatly reduced. The setting of the clamping point 40 can greatly save the cost and reduce the assembly time. Without affecting the function of the filter itself, the assembly time is saved, and the assembly is more convenient.
[0028] It should be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Additionally, unless otherwise stated, the term "about" preceding a value or description is understood in accordance with the phrase "within an acceptable error range for the variables and / or methods described".
[0029] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since numerous further modifications and changes can be apparent to one skilled in the art without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims and their equivalents.
Claims
1. An improved spin-on filter comprising a housing (10), a cover plate assembly (20), a threaded port filter cartridge assembly (30), characterized in that: The cover plate assembly (20) comprises a sealing ring (201), a fixed plate (202) and a cover plate (203), the cover plate (203) is provided with a center hole (2032) and a plurality of oil holes (2031); The filter core assembly (30) comprises a center tube (306) and a filter core upper cover (301) and a filter core lower cover (304) connected to both ends of the center tube (306), the filter core upper cover (301) has a threaded interface for communicating with an engine oil circuit or a hydraulic circuit; The cover plate (203) and the filter core upper cover (301) are provided with matched rotation stopping structures.
2. The improved spin-on filter of claim 1, wherein: The threaded interface of the filter core upper cover (301) is a special-shaped nut (302) with any shape matched with the shape formed in the cover plate (203), the special-shaped nut (302) is integrally formed with the filter core upper cover (301), and the special-shaped nut (302) and the filter core upper cover (301) are both non-metal.
3. The improved spin-on filter of claim 2, wherein: The outer circumferential side of the special-shaped nut (302) is a partial rotation stopping structure, the inner wall of the special-shaped nut (302) is provided with threads, and the center hole (2032) in the cover plate (203) is matched with the filter core upper cover (301) and the special-shaped nut (302) through the rotation stopping structure.
4. The improved spin-on filter of claim 3, wherein: The rotation stopping structure of the special-shaped nut (302) comprises a non-circular hole (polygonal profile, irregular profile), a key connection and a limiting assembly, which prevents the cover plate (203) and the special-shaped nut (302) from rotating.
5. The improved spin-on filter of claim 1, wherein: The shape and size of the center hole (2032) are consistent with those of the special-shaped nut (302), the inner side of the cover plate (203) is provided with a bevel, the oil holes (2031) are arranged on the bevel and are uniformly distributed on the outer circumferential side of the center oil hole (2032).
6. The improved spin-on filter of claim 1, wherein: The outer circumferential side of the special-shaped nut (302) is provided with at least two groups of limiting protrusions, the limiting protrusions are outwardly protruding, each group of limiting protrusions is provided with at least two limiting protrusions, and the limiting protrusions are located at the same end surface of the special-shaped nut (302).
7. The improved spin-on filter of claim 6, wherein: The limiting protrusions are clamping points (40), the clamping points (40) are arc-shaped, and the distance between the clamping points (40) and the bottom of the special-shaped nut (302) is greater than the thickness of the inner wall of the cover plate (203).
8. The improved spin-on filter of claim 1, wherein: The center tube (306) is provided with a filter paper (303) on the outer circumferential side, and the filter core lower cover (304) is further movably connected with a supporting member; The supporting member comprises a sponge body or an elastic body, is used for supporting the filter core assembly (30), and increases the sealing property between the cover plate (203) and the filter core upper cover (301) by elastic support.