Oil-water separation filter element and crankcase ventilation filter
By designing an oil-water separation filter element, with an inner layer that allows oil to pass through while blocking water, and an outer layer that allows water to pass through while blocking oil, the problem of oil emulsification in the crankcase ventilation filter is solved. This achieves pure oil separation, extends the oil replacement cycle, and improves engine performance and reliability.
Patent Information
- Application Number
- CN202511318287.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-16
- Publication Date
- 2025-12-05
AI Technical Summary
In the process of intercepting engine oil vapor, the existing crankcase ventilation filter causes water vapor to liquefy into water and flow back into the engine along with the oil, resulting in oil emulsification, shortening the oil change cycle and affecting engine performance.
Design an oil-water separation filter element comprising an inner layer structure and an outer layer structure. The inner layer is used for oil passage and water blocking, while the outer layer is used for water passage and oil blocking. Oil and water separation is achieved through specific filter media and a porous plate skeleton. A limiting groove and a sealing structure are set to ensure filtration effect and stability.
It achieves complete separation of engine oil and water, avoids oil emulsification, extends oil change intervals, improves lubrication performance and engine life, and reduces operating costs.
Smart Images
Figure CN121066697A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of filter, in particular to an oil-water separation filter element and a crankcase ventilation filter. BACKGROUND
[0002] The discharge of the crankcase ventilation system is included in the whole vehicle emission test project, and becomes one of the influencing factors of emission, so the crankcase ventilation filter (also known as oil-gas separator) becomes a standard for almost all engines.
[0003] The existing crankcase ventilation filter intercepts the oil vapor in the original crankcase ventilation system, and then returns to the engine, but in this process, a small amount of water vapor in the crankcase gas is also intercepted and liquefied into water, which returns to the engine together with the intercepted oil. This part of water will form oil emulsion with oil during engine operation, shorten the oil replacement and maintenance cycle, and ultimately affect the service life of the oil and the performance of the engine. SUMMARY
[0004] The purpose of the present application is to provide an oil-water separation filter element and a crankcase ventilation filter, which can perform secondary filtration on the oil-gas separated oil mixture, realize oil-water separation, avoid the formation of oil emulsion during engine operation, and prolong the oil replacement and maintenance cycle.
[0005] To achieve the above purpose, the following technical scheme is provided:
[0006] The oil-water separation filter element is applied to the crankcase ventilation filter, and the crankcase ventilation filter is provided with an oil liquid discharge channel.
[0007] The fixed assembly includes a first end cover and a second end cover, the first end cover has an oil inlet hole, and the second end cover has an oil outlet hole, one end of the oil inlet hole is in communication with the oil liquid discharge channel;
[0008] The filter assembly includes an inner layer structure and an outer layer structure, one of the inner layer structure and the outer layer structure is used for oil passing and water blocking, and the other of the inner layer structure and the outer layer structure is used for water passing and oil blocking, one end of the inner layer structure and the outer layer structure is in abutment with the first end cover, the other end of the inner layer structure and the outer layer structure is in abutment with the second end cover, a shunt cavity is formed between the inner layer structure and the outer layer structure, the other end of the oil inlet hole is in communication with the shunt cavity, and the oil outlet hole is in communication with the oil discharge side of the filter assembly.
[0009] As an optional scheme of the oil-water separation filter element, the inner layer structure includes a first filter material, and the first filter material is used for oil passing and water blocking.
[0010] As an optional solution of the oil-water separation filter element, the inner side of the first filter material is provided with at least one layer of first porous plate framework, and / or the outer side of the first filter material is provided with at least one layer of second porous plate framework.
[0011] As an optional solution of the oil-water separation filter element, the first filter material is made by a corrugation process or the first filter material has a circular structure.
[0012] As an optional solution of the oil-water separation filter element, the outer layer structure comprises a second filter material for water passing and oil blocking.
[0013] As an optional solution of the oil-water separation filter element, the inner side of the second filter material is provided with at least one layer of third porous plate framework, and / or the outer side of the second filter material is provided with at least one layer of fourth porous plate framework.
[0014] As an optional solution of the oil-water separation filter element, the second filter material has a circular structure or is made by a corrugation process.
[0015] As an optional solution of the oil-water separation filter element, the first end cover has a first annular limiting groove, the second end cover is provided with a second annular limiting groove corresponding to the first annular limiting groove, one end of the inner layer structure is embedded in the first annular limiting groove, and the other end of the inner layer structure is embedded in the second annular limiting groove; and / or
[0016] The first end cover has a third annular limiting groove, the second end cover is provided with a fourth annular limiting groove corresponding to the third annular limiting groove, one end of the outer layer structure is embedded in the third annular limiting groove, and the other end of the outer layer structure is embedded in the fourth annular limiting groove.
[0017] A crankcase ventilation filter, comprising a first mounting cavity, a second mounting cavity, and the oil-water separation filter element according to any one of the above, the oil-gas separation filter element is installed in the first mounting cavity, the first mounting cavity and the second mounting cavity are communicated through an oil liquid discharge channel, the oil-water separation filter element is installed in the second mounting cavity, the oil liquid discharge channel is communicated with the oil inlet hole of the oil-water separation filter element, the second mounting cavity has an oil outlet joint and a water outlet joint, the oil outlet joint is communicated with the oil discharge hole, and the water discharge side of the filter assembly is communicated with the water outlet joint.
[0018] As an optional solution of the crankcase ventilation filter, the first end cover of the oil-water separation filter element is provided with a sealing groove, a part of the first sealing element is embedded in the sealing groove, and the other part of the first sealing element abuts against the top wall of the second mounting cavity; and / or
[0019] The second end cover of the oil-water separation filter core is provided with a first annular part, and the bottom wall of the second mounting cavity is provided with a second annular part, and the first annular part is inserted with the second annular part.
[0020] Compared with the prior art, the present application has the following beneficial effects:
[0021] The oil-water separation filter core is applied to the crankcase ventilation filter, the first end cover and the second end cover of the fixing assembly are arranged at two ends of the filtering assembly respectively, the shunt cavity is formed between the inner layer structure and the outer layer structure of the filtering assembly, the oil inlet hole is arranged on the first end cover, one end of the oil inlet hole is communicated with the oil liquid discharge channel of the crankcase ventilation filter, and the other end of the oil inlet hole is communicated with the shunt cavity. The oil vapor in the crankcase ventilation filter is first subjected to oil-gas separation, and then the separated oil mixture sequentially passes through the oil liquid discharge channel and the oil inlet hole to reach the shunt cavity, wherein the water in the oil mixture is discharged through the outer layer structure or the inner layer structure of the oil-water separation structure, and the oil in the oil mixture passes through the inner layer structure or the outer layer structure of the oil-water separation structure and flows out from the oil discharge hole, so that the pure oil is obtained, the oil and water in the oil are completely separated, the oil that has completed oil-gas separation can be subjected to secondary filtration, oil-water separation is realized, oil emulsions are avoided during the working process of the engine, and the oil replacement and maintenance period is prolonged.
[0022] The crankcase ventilation filter is provided, a oil-gas separation filter core is mounted in the first mounting cavity of the crankcase ventilation filter, the oil-water separation filter core is mounted in the second mounting cavity, and the oil liquid discharge channel is communicated with the oil inlet hole of the oil-water separation filter core. Not only can oil and gas be separated, but also the oil mixture can be subjected to secondary filtration, oil-water separation is realized, oil emulsions are avoided during the working process of the engine, and the oil replacement and maintenance period is prolonged. BRIEF DESCRIPTION OF DRAWINGS
[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the contents of the embodiments of the present application and the drawings.
[0024] Figure 1 It is a sectional view of the crankcase ventilation filter in the embodiment of the present application.
[0025] Figure 2 It is an assembly schematic view of the oil-water separation filter core from a first perspective in the embodiment of the present application.
[0026] Figure 3 It is an assembly schematic view of the oil-water separation filter core from a second perspective in the embodiment of the present application.
[0027] Figure 4 is a top view of the oil-water separation filter element in the embodiment of the present application;
[0028] Figure 5 is Figure 4 is a sectional view along A-A direction in the embodiment of the present application;
[0029] Figure 6 is an exploded schematic view of the oil-water separation filter element in the embodiment of the present application;
[0030] Figure 7 is an assembly schematic view of the inner layer structure and the second end cover in the embodiment of the present application;
[0031] Figure 8 is a structural schematic view of the outer layer structure in the embodiment of the present application;
[0032] Figure 9 is a sectional view of the first end cover and the second end cover in the embodiment of the present application;
[0033] Figure 10 is a flow schematic view of the oil mixture in the crankcase ventilation filter in the embodiment of the present application.
[0034] Reference signs:
[0035] 100, first mounting cavity; 101, oil liquid discharge channel; 200, second mounting cavity; 201, oil outlet joint; 202, water outlet joint; 203, second annular portion; 300, oil-water separation filter element; 400, oil-gas separation filter element; 500, one-way valve; 501, mounting pipe; 502, float valve element;
[0036] 1, first end cover; 2, second end cover; 3, inner layer structure; 4, outer layer structure; 5, first sealing element; 6, second sealing element; 7, shunt cavity;
[0037] 11, oil inlet hole; 12, first annular limiting groove; 13, third annular limiting groove; 14, sealing groove;
[0038] 21, oil discharge hole; 22, second annular limiting groove; 23, fourth annular limiting groove; 24, first annular portion;
[0039] 31, first filter material; 32, first porous plate framework; 33, second porous plate framework;
[0040] 41, second filter material; 42, third porous plate framework; 43, fourth porous plate framework. DETAILED DESCRIPTION
[0041] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application 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. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.
[0042] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.
[0043] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "arrangement", "connection" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0044] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application.
[0045] With the continuous upgrading of whole vehicle emission test standards, the emission indicators of the crankcase ventilation system have been formally included in the core project category of whole vehicle emission test, prompting engine manufacturers to pay great attention to the optimization design of the crankcase ventilation system. Under this background, the crankcase ventilation filter (also known as oil-gas separator in the industry term) has rapidly become a standard configuration component for almost all types of engines due to its unique emission control function.
[0046] From the technical principle level, the existing crankcase ventilation filter mainly undertakes the interception and recovery of oil vapor in the original crankcase ventilation system. In the specific working process, the device uses the physical adsorption and inertial collision mechanisms to effectively intercept the oil vapor molecules mixed in the crankcase gas through the precisely designed filter core structure, and guide them to reflow to the engine lubrication system for recycling. This design has significant advantages in improving oil utilization and reducing oil consumption, and also helps to reduce the pollution of crankcase emissions to the atmosphere.
[0047] However, the existing technical solution has exposed a technical defect that needs to be solved in practical application. Because the composition of the crankcase gas is complex, in addition to oil vapor, it also contains a certain proportion of water vapor. When the gas passes through the filter, part of the water vapor will be liquefied to form liquid water on the surface of the filter core. These liquid water will mix with the intercepted oil to form an oil mixture containing water, which will eventually re-enter the engine lubrication system with the recovered oil. In the continuous high-temperature operating environment of the engine, this water-containing oil will undergo complex physical and chemical changes, causing the additives in the oil to fail and the base oil performance to deteriorate, and then forming oil emulsion with viscous characteristics.
[0048] The generation of oil emulsion has many negative effects on the engine system. From the perspective of lubrication performance, the oil film strength of emulsified oil is significantly reduced, which cannot form an effective lubrication protection layer on the surface of moving parts, leading to increased wear of internal friction pairs in the engine. From the analysis of heat dissipation effect, the thermal conductivity of emulsified oil is greatly reduced, affecting the normal operation of the engine thermal management system, and may cause local overheating. From the perspective of service life, oil emulsification can accelerate the oxidation and deterioration process of the oil, forcing the engine to shorten the oil change and maintenance period, and increasing the user's use cost. More seriously, long-term use of emulsified oil can cause an increase in engine internal deposits and lubrication channel blockage, ultimately leading to engine performance degradation, increased failure rate, and other systemic problems.
[0049] In order to be able to filter the oil that has completed oil-gas separation, realize oil-water separation, avoid the formation of oil emulsion during engine operation, and prolong the oil change and maintenance period, the present embodiment provides an oil-water separation filter core and a crankcase ventilation filter, which will be described below in conjunction with Figures 1 to 10 The specific content of the present embodiment will be described in detail.
[0050] The embodiment provides an oil-water separation filter element 300 applied to a crankcase ventilation filter, the crankcase ventilation filter is provided with an oil liquid discharge channel 101, and the oil-water separation filter element 300 comprises a fixing assembly and a filtering assembly. The fixing assembly comprises a first end cover 1 and a second end cover 2, the first end cover 1 is provided with an oil inlet hole 11, the second end cover 2 is provided with an oil outlet hole 21, and one end of the oil inlet hole 11 is communicated with the oil liquid discharge channel 101. The filtering assembly comprises an inner layer structure 3 and an outer layer structure 4, one of the inner layer structure 3 and the outer layer structure 4 is used for oil passing and water blocking, and the other of the inner layer structure 3 and the outer layer structure 4 is used for water passing and oil blocking, one end of the inner layer structure 3 and the outer layer structure 4 is abutted with the first end cover 1, the other end of the inner layer structure 3 and the outer layer structure 4 is abutted with the second end cover 2, a shunt cavity 7 is formed between the inner layer structure 3 and the outer layer structure 4, the other end of the oil inlet hole 11 is communicated with the shunt cavity 7, and the oil outlet hole 21 is communicated with an oil discharge side of the filtering assembly.
[0051] The oil-water separation filter element 300 is specially designed for the crankcase ventilation filter, the filter element realizes efficient separation of water in oil, and therefore the reliability and durability of an engine lubrication system are significantly improved. The first end cover 1 and the second end cover 2 of the fixing assembly are accurately arranged at two ends of the filtering assembly respectively, and form a closed and orderly working space. The shunt cavity 7 formed between the inner layer structure 3 and the outer layer structure 4 of the filtering assembly plays a key role in buffering and shunting. The oil inlet hole 11 arranged on the first end cover 1 is communicated with the oil liquid discharge channel 101 of the crankcase ventilation filter at one end and with the shunt cavity 7 at the other end, so that the whole oil-water separation process can be orderly carried out. In a specific working process, oil vapor in the crankcase ventilation filter is first subjected to oil-gas separation in the filter, which is the first step of oil recycling. Then, the separated oil mixture passes through the oil liquid discharge channel 101, the oil inlet hole 11 and reaches the shunt cavity 7. When the oil mixture enters the shunt cavity 7, due to the special structural design, water in the oil mixture is effectively discharged through the oil passing and water blocking outer layer structure 4 or the inner layer structure 3. This is because the molecular structure and surface tension of water and oil are different, and the oil passing and water blocking structure can selectively block the passage of water and allow oil to pass through. The oil liquid in the oil mixture passes through the oil passing and water blocking inner layer structure 3 or the outer layer structure 4 and flows out from the oil outlet hole 21, and finally the pure oil is obtained.
[0052] This unique oil-water separation method achieves complete separation of oil and water in engine oil, with many significant technical effects. First, the present application can perform secondary filtration on engine oil that has completed oil-gas separation, further improving the purity of the engine oil. Compared with traditional crankcase ventilation filters, the content of water in the engine oil is greatly reduced, avoiding the formation of engine oil emulsions during engine operation. Second, due to the reduction of water in the engine oil, the physical and chemical properties of the engine oil are better maintained, with more stable performance indicators such as lubricity, flowability and cleanliness, which can effectively reduce friction and wear between engine components and prolong the service life of the engine. Third, pure engine oil can better play its cooling and cleaning role, ensuring that the engine operates at normal operating temperature, reducing the production of carbon and impurities, and further improving the performance and reliability of the engine. Finally, the formation of engine oil emulsions is avoided, extending the oil change maintenance cycle, reducing the use cost of the vehicle owner, and also reducing resource waste caused by frequent oil changes, which has certain environmental protection significance.
[0053] Laboratory tests show that after 100 hours of continuous operation, the water content of engine oil using the oil-water separation filter element 300 is stably controlled below 0.1%, which is reduced by more than 80% compared with traditional filters, effectively blocking the emulsion reaction chain; the kinematic viscosity index of pure engine oil is increased by 15%-20%, the oil film strength is increased by 25%, the wear rate of engine friction pairs is reduced by 30%, and the service life of key components is significantly prolonged.
[0054] Further, the inner layer structure 3 includes a first filter material 31 for oil passage and water blocking. The first filter material 31 uses a hydrophobic polymer material, for example, a polytetrafluoroethylene microporous membrane. Polytetrafluoroethylene (PTFE) is a high molecular compound with high stability. The polytetrafluoroethylene microporous membrane has a large number of uniformly distributed micro pores. The size of these micro pores is usually in the nanometer to micrometer range, which can accurately screen the passing substances. From the perspective of surface energy, the surface energy of the polytetrafluoroethylene microporous membrane is lower than the surface tension of water. Surface energy is a physical property of the surface of a substance, which reflects the interaction force between the surface molecules of the substance. When water contacts the surface of the polytetrafluoroethylene microporous membrane, due to the larger surface tension of water and the lower surface energy of the membrane, the cohesion between water molecules is greater than the adhesion between water molecules and membrane surface molecules, so water cannot wet and penetrate the membrane surface, but forms water droplets and rolls off, achieving the effect of water blocking. On the contrary, the surface tension of engine oil is relatively small, and its molecular structure has certain compatibility with the polytetrafluoroethylene microporous membrane. Engine oil molecules can more easily overcome the resistance of the membrane surface and pass through the micropores into the internal channel of the filter element, thereby realizing the function of oil passage. This "oil passage and water blocking" feature enables the first filter material 31 to accurately separate engine oil and water in the mixed fluid, providing a guarantee for subsequent pure engine oil recovery.
[0055] Further, the first filter material 31 needs to withstand pressure and impact force from the oil mixture during operation. If the first filter material 31 lacks sufficient support on its own, it is prone to deformation, damage and other problems during long-term use, thereby affecting the oil-water separation effect and the service life of the filter element. The provision of at least one layer of first porous plate framework 32 on the inner side of the first filter material 31, and / or at least one layer of second porous plate framework 33 on the outer side of the first filter material 31, can effectively enhance the support strength of the first filter material 31. The porous plate framework has high rigidity and stability, can disperse the pressure borne by the first filter material 31, and prevent it from deforming due to excessive local stress. For example, when the oil mixture impacts the first filter material 31 at a high flow rate, the porous plate framework can evenly distribute the impact force to the entire filter material surface, avoiding local indentation or rupture of the filter material, ensuring that the first filter material 31 always maintains a stable shape and filtering performance, thereby prolonging the service life of the filter element. The porosity design on the porous plate framework can guide the flow direction of the oil mixture, optimizing the filtration path. When the oil mixture passes through the first filter material 31, the porosity of the porous plate framework can make the oil evenly distributed on the surface of the first filter material 31, avoiding local flow rate being too large or too small. This can ensure that each part of the first filter material 31 can fully play a filtering role, improving the uniformity and efficiency of oil-water separation. At the same time, reasonable porosity design can also reduce the residence time of oil on the filter material surface, reduce the risk of filter material blockage, and further improve the filtering effect.
[0056] Further, the first filter material 31 is made by a corrugated process or the first filter material 31 has a circular structure. If the first filter material 31 is made by a corrugated process, this structure design can significantly increase the filtering area of the first filter material 31. Under the same space size, the corrugated structure can make the surface area of the first filter material 31 increase exponentially. Greater filtering area means that more engine oil can be in contact with the first filter material 31 at the same time, thereby improving the filtering efficiency. For example, in unit time, the first filter material 31 made by a corrugated process can handle more engine oil mixture, speed up the oil-water separation speed, and meet the needs of high-load operation of the engine. The corrugated process can also improve the flow state of the engine oil on the surface of the first filter material 31. The grooves and protrusions formed by the corrugated process can guide the engine oil to form turbulent flow, enhancing the interaction between the engine oil and the first filter material 31. The turbulent flow state can make the water and impurities in the engine oil more easily contact the filter material and be separated out, further improving the oil-water separation effect. If the first filter material 31 has a circular structure, this design has many advantages. First, the circular structure has good symmetry, which can ensure that the first filter material 31 is uniformly stressed in all directions. Under the impact of the engine oil mixture, the circular structure of the first filter material 31 can better disperse stress and reduce the risk of damage due to stress concentration. Second, the circular structure can also reduce the dead angle and liquid accumulation area inside the filter core, avoiding the stagnation and deterioration of engine oil in these areas, and ensuring the cleanliness and hygiene inside the filter core.
[0057] Further, the outer layer structure 4 includes a second filter material 41 for water passing and oil blocking. The second filter material 41 is specially designed for water passing and oil blocking, which is based on the difference in molecular structure and surface characteristics of engine oil and water. Engine oil is mainly composed of hydrocarbons and has hydrophobic and lipophilic properties, while water is a polar molecule with a large surface tension. The second filter material 41, through special material selection and microstructure, can allow water to pass through smoothly while effectively blocking the penetration of engine oil. Its material can be selected from high molecular materials with hydrophilic and oleophobic properties. The molecular structure of this type of material contains hydrophilic groups that can form hydrogen bonds and other interactions with water molecules, making it easier for water molecules to adhere and pass through the filter material. Its oleophobic carbon chain structure produces a repulsive effect on engine oil molecules, preventing engine oil from passing through, thereby achieving precise oil-water separation.
[0058] Further, the inner side of the second filter material 41 is provided with at least one layer of third porous plate framework 42, and / or the outer side of the second filter material 41 is provided with at least one layer of fourth porous plate framework 43. The porous plate framework is usually made of high-strength, corrosion-resistant metal materials (such as stainless steel) or engineering plastics. The third porous plate framework 42 provided on the inner side of the second filter material 41 can provide internal support for the filter material, preventing deformation or damage of the filter material under high-pressure oil impact. Similarly, the fourth porous plate framework 43 on the outer side plays a role in external protection and reinforcement, enhancing the mechanical strength of the entire outer structure 4. This double internal and external support design enables the second filter material 41 to maintain a stable shape and structure in complex working environments, ensuring the long-term effective performance of the "water-blocking oil" function. The numerous pores on the porous plate framework can guide the oil and water to flow along a specific path, making the fluid distribution more uniform when passing through the second filter material 41. Uniform fluid distribution helps to improve filtration efficiency and avoid problems such as insufficient filtration or local filter clogging caused by excessive or insufficient fluid flow rate. At the same time, the porous plate framework also has a certain pre-filtration effect, intercepting larger particles of impurities, reducing the direct impact and clogging of these impurities on the second filter material 41, and prolonging the service life of the filter material.
[0059] Further, the second filter material 41 has a circular structure or is made using a folding process. When the second filter material 41 has a circular structure, the circular structure can produce a more uniform flow field distribution when the fluid passes through the filter material, reducing turbulence and vortex phenomena. This helps to reduce the resistance of the fluid passing through the filter material, improve filtration efficiency, and reduce energy loss. The circular structure also has good symmetry, which can ensure uniform stress distribution of the filter material during installation and use, avoiding deformation or damage of the filter material caused by uneven stress. If the second filter material 41 is made using a folding process, the effective filtration area of the filter material can be significantly increased. By folding the filter material, more filter material can be accommodated in the same space, thereby improving the filtration capacity per unit volume. Greater filtration area means that at the same flow rate, the fluid can pass through the filter material at a slower speed, allowing more time for water to contact the second filter material 41 and improving water efficiency.
[0060] Further, the first end cover 1 has a first annular limiting groove 12, the second end cover 2 is provided with a second annular limiting groove 22 corresponding to the first annular limiting groove 12, one end of the inner layer structure 3 is embedded in the first annular limiting groove 12, and the other two ends of the inner layer structure 3 are embedded in the second annular limiting groove 22; and / or the first end cover 1 has a third annular limiting groove 13, the second end cover 2 is provided with a fourth annular limiting groove 23 corresponding to the third annular limiting groove 13, one end of the outer layer structure 4 is embedded in the third annular limiting groove 13, and the other end of the outer layer structure 4 is embedded in the fourth annular limiting groove 23.
[0061] The inner layer structure 3 is an important part of the filter core that realizes the core filtering function. The stability and accuracy of its installation directly affect the filtering effect. When one end of the inner layer structure 3 is embedded in the first annular limiting groove 12 and the other end is embedded in the second annular limiting groove 22, a stable nesting structure is formed. This embedding method can effectively limit the movement of the inner layer structure 3 in the axial and radial directions. During the operation of the filter core, it will be subjected to various forces such as pressure, impact force from the fluid and its own vibration. Without the constraint of the limiting groove, the inner layer structure 3 may be displaced or deformed under the action of these forces, resulting in blockage of the filtering channel, reduction of filtering efficiency, and even damage to the filter core. The first annular limiting groove 12 and the second annular limiting groove 22 firmly fix the inner layer structure 3 in the predetermined position, ensuring that it can maintain a stable shape and position under various working conditions, thereby ensuring the continuity and stability of the filtering process. The embedding cooperation of the limiting groove and the inner layer structure 3 also plays a certain sealing role. After the inner layer structure 3 is embedded in the limiting groove, the close contact between them can prevent fluid leakage at the connection, avoid unfiltered fluid bypassing the inner layer structure 3 and directly entering the subsequent system, and ensure the thoroughness of the filtering. The outer layer structure 4 mainly plays a role in auxiliary filtering and protecting the inner layer structure 3 in the filter core. The cooperation of the outer layer structure 4 and the limiting groove can ensure the accurate relative position between the outer layer structure 4 and the inner layer structure 3. During the assembly of the filter core, by accurately embedding the outer layer structure 4 into the third annular limiting groove 13 and the fourth annular limiting groove 23, a reasonable gap can be formed between the outer layer structure 4 and the inner layer structure 3, which is crucial for the uniform distribution of fluid and the smooth progress of the filtering process. If the outer layer structure 4 is not installed accurately, it may cause uneven fluid distribution, excessive flow in some areas and insufficient flow in other areas, thereby affecting the filtering efficiency and quality. In addition, the stable connection of the outer layer structure 4 and the limiting groove can also enhance the impact resistance of the entire filter core. During transportation, installation and use, the filter core may be subjected to external forces such as collision and extrusion. The outer layer structure 4, through the close cooperation with the limiting groove, can better withstand these external forces, disperse the impact force to the entire end cover structure, avoid damage to the outer layer structure 4 itself and the indirect impact on the inner layer structure 3 caused by the damage to the outer layer structure 4, thereby prolonging the service life of the filter core.
[0062] The embodiment also provides a crankcase ventilation filter, which comprises the first mounting cavity 100, the second mounting cavity 200 and the oil-water separation filter element 300 mentioned above, the oil-gas separation filter element 400 is mounted in the first mounting cavity 100, the first mounting cavity 100 is communicated with the second mounting cavity 200 through the oil liquid discharge channel 101, the oil-water separation filter element 300 is mounted in the second mounting cavity 200, the oil liquid discharge channel 101 is communicated with the oil inlet hole 11 of the oil-water separation filter element 300, the second mounting cavity 200 is provided with the oil outlet joint 201 and the water outlet joint 202, the oil outlet joint 201 is communicated with the oil discharge hole 21, and the drainage side of the filter assembly is communicated with the water outlet joint 202. The crankcase ventilation filter can not only separate oil gas, but also perform secondary filtration on the oil mixture, realize oil-water separation, avoid formation of oil emulsion in the working process of the engine, and prolong the replacement and maintenance period of the oil. Optionally, the water outlet joint 202 is provided with the one-way valve 500, the one-way valve 500 comprises the mounting pipe 501 and the float valve core 502 in the mounting pipe 501, can be used for automatically draining water, and can prevent foreign matters from entering the second mounting cavity 200 through the water outlet joint 202.
[0063] Further, the first end cover 1 of the oil-water separation filter element 300 is provided with the sealing groove 14, a part of the first sealing element 5 is embedded in the sealing groove 14, and the other part of the first sealing element 5 abuts against the top wall of the second mounting cavity 200. The first sealing element 5 is usually made of materials with excellent elasticity and oil resistance, such as nitrile rubber or fluororubber. These materials can maintain good sealing performance under different temperature and pressure conditions and are not easy to age and deform. Good sealing performance is crucial to the oil-water separation effect. If there is a leakage problem in the filter element, the oil-water mixture that has not been fully separated may directly enter the subsequent system, resulting in incomplete separation and affecting the normal operation of the equipment. The sealing design of the first end cover 1 can ensure that the oil-water mixture can only be separated in the filter element according to the predetermined path, and the pure fluid after filtration and separation can flow out of the filter element, thereby improving the efficiency and quality of oil-water separation.
[0064] Further, the second end cover 2 of the oil-water separation filter element 300 is provided with a first annular portion 24, and the bottom wall of the second mounting cavity 200 is provided with a second annular portion 203, and the first annular portion 24 is inserted into the second annular portion 203. First, it can realize accurate positioning between the second end cover 2 and the second mounting cavity 200. During installation, the operator only needs to accurately insert the first annular portion 24 into the second annular portion 203, which can ensure that the second end cover 2 is installed in place, avoiding performance degradation or failure of the filter element due to installation deviation. Second, the insertion structure provides stable connection. The close fit between the first annular portion 24 and the second annular portion 203 can withstand a certain pulling force and torque, preventing the second end cover 2 from loosening or falling off during use. This stable connection is crucial to ensure the overall structural integrity of the filter element, especially when the filter element is subjected to external force impact or vibration, the insertion structure can effectively transfer the force and maintain the relative position between the components.
[0065] Optionally, a slot is arranged on the surface of the second annular portion 203, and the first annular portion 24 is inserted into the slot. A second sealing element 6 is arranged at the connection between the first annular portion 24 and the slot. The slot usually adopts a regular geometric shape, such as a rectangle or a trapezoid, which is convenient for processing and manufacturing, and can provide stable insertion guidance. The size of the slot is closely matched with the first annular portion 24, ensuring that the first annular portion 24 can be smoothly inserted without excessive gap or tight jam. The depth of the slot should ensure that the first annular portion 24 can be inserted to a sufficient depth to provide sufficient connection strength, while avoiding increasing the processing difficulty and cost due to excessive depth. Arranging the second sealing element 6 at the connection between the first annular portion 24 and the slot is a key measure to further improve the sealing performance. The second sealing element 6 is usually made of materials with excellent sealing performance and oil resistance, such as silicone rubber or polytetrafluoroethylene. These materials have good elasticity and flexibility, and can tightly fit the surface of the first annular portion 24 and the slot under different temperature and pressure conditions, forming an effective sealing barrier.
[0066] Note that the above is only the preferred embodiment of the present application and the technical principle applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.
Claims
1. Oil-water separation filter element for use in a crankcase ventilation filter, said crankcase ventilation filter being provided with an oil liquid discharge channel (101), characterized in that, The oil-water separation filter element comprises: A fixed assembly comprising a first end cover (1) and a second end cover (2), the first end cover (1) having an oil inlet hole (11), the second end cover (2) having an oil outlet hole (21), one end of the oil inlet hole (11) being in communication with the engine oil liquid discharge channel (101); A filter assembly comprising an inner layer structure (3) and an outer layer structure (4), one of the inner layer structure (3) and the outer layer structure (4) being used for oil passing and water blocking, the other of the inner layer structure (3) and the outer layer structure (4) being used for water passing and oil blocking, one end of the inner layer structure (3) and the outer layer structure (4) abutting against the first end cover (1), the other end of the inner layer structure (3) and the outer layer structure (4) abutting against the second end cover (2), a shunt cavity (7) being formed between the inner layer structure (3) and the outer layer structure (4), the other end of the oil inlet hole (11) being in communication with the shunt cavity (7), the oil outlet hole (21) being in communication with the oil outlet side of the filter assembly.
2. The oil-water separation cartridge of claim 1, wherein, The inner layer structure (3) comprises a first filter material (31) for oil passing and water blocking.
3. The oil-water separation cartridge of claim 2, wherein, The inner side of the first filter material (31) is provided with at least one layer of first porous plate framework (32), and / or the outer side of the first filter material (31) is provided with at least one layer of second porous plate framework (33).
4. The oil-water separation cartridge of claim 2, wherein, The first filter material (31) is made by a folding process or is in a circular structure.
5. The oil-water separation cartridge of claim 1, wherein, The outer layer structure (4) comprises a second filter material (41) for water passing and oil blocking.
6. The oil-water separation cartridge of claim 5, wherein, The inner side of the second filter material (41) is provided with at least one layer of third porous plate framework (42), and / or the outer side of the second filter material (41) is provided with at least one layer of fourth porous plate framework (43).
7. The oil-water separation cartridge of claim 5, wherein, The second filter material (41) is in a circular structure or is made by a folding process.
8. The oil-water separation cartridge of any one of claims 1-7, wherein, The first end cover (1) has a first annular limiting groove (12), the second end cover (2) is provided with a second annular limiting groove (22) corresponding to the first annular limiting groove (12), one end of the inner layer structure (3) is embedded in the first annular limiting groove (12), the other end of the inner layer structure (3) is embedded in the second annular limiting groove (22); and / or The first end cover (1) has a third annular limiting groove (13), the second end cover (2) is provided with a fourth annular limiting groove (23) corresponding to the third annular limiting groove (13), one end of the outer layer structure (4) is embedded in the third annular limiting groove (13), the other end of the outer layer structure (4) is embedded in the fourth annular limiting groove (23).
9. A crankcase ventilation filter, characterized by The filter assembly comprises a first mounting cavity (100), a second mounting cavity (200) and the oil-water separation filter element as claimed in any one of claims 1-8, the oil-gas separation filter element (400) is mounted in the first mounting cavity (100), the first mounting cavity (100) is communicated with the second mounting cavity (200) through an oil liquid discharge channel (101), the oil-water separation filter element is mounted in the second mounting cavity (200), the oil liquid discharge channel (101) is communicated with the oil inlet hole (11) of the oil-water separation filter element, the second mounting cavity (200) has an oil outlet joint (201) and a water outlet joint (202), the oil outlet joint (201) is communicated with the oil discharge hole (21), and a water discharge side of the filter assembly is communicated with the water outlet joint (202).
10. The crankcase ventilation filter of claim 9, wherein, The first end cover (1) of the oil-water separation filter element is provided with a sealing groove (14), a part of the first sealing element (5) is embedded in the sealing groove (14), and the other part of the first sealing element (5) abuts against the top wall of the second mounting cavity (200). And / or The second end cover (2) of the oil-water separation filter element is provided with a first annular part (24), the bottom wall of the second mounting cavity (200) is provided with a second annular part (203), and the first annular part (24) is inserted with the second annular part (203).