Oil filter

Abstract

The invention discloses an oil filter, and belongs to the technical field of filters. The engine oil filter comprises a protective shell, a filtering unit and an adding unit, an engine oil filter element of the filtering unit is arranged in the protective shell, the interior of the engine oil filter element is a clean side space, the exterior of the engine oil filter element is a dirty side space, and engine oil located in the dirty side space can enter the clean side space through the engine oil filter element. The oil pressure of the dirty side space is greater than that of the clean side space; a filling tank of the adding unit is arranged in the protective shell, an additive is filled in the filling tank, the filling tank is provided with an inlet and an outlet, the inlet is communicated with the dirty side space, the outlet is communicated with the clean side space, one end of a flow guide pipe is inserted into the outlet, and the other end of the flow guide pipe extends into the filling tank and is located below the liquid level of the additive. The total base number of the engine oil is in a reasonable range in a long time, the service life of the engine oil is prolonged, and good operation of an engine is protected.

Description

Technical Field

[0001] The present invention relates to the technical field of oil filters, and in particular to an oil filter. Background Art

[0002] During continuous engine operation, complex physical and chemical changes inevitably produce a range of acidic substances. These acids are generated through various pathways, including the further oxidation of intermediate products from incomplete fuel combustion, and the chemical reactions of internal engine components under high temperature and pressure. When these acids enter the engine oil through the engine's circulation system, they significantly affect its performance, most critically causing a gradual decrease in the oil's total base number (TBN).

[0003] The Total Base Number (TBN) of engine oil is a key indicator of its ability to neutralize acids. A decrease in the TBN indicates a weakening of the oil's ability to neutralize acids. As acids accumulate in the oil, the oil's acid-base balance is disrupted, impairing its essential functions—lubrication, cooling, cleaning, and rust prevention—to varying degrees. This not only directly impacts the oil's service life, requiring more frequent oil changes and increasing operating costs, but also reduces its protective effect on the engine, preventing it from effectively lubricating and protecting the various precision components within it. This, in turn, impacts the engine's overall performance and reliability, shortening its service life.

[0004] In recent years, new fuels such as methanol and biodiesel have seen increasing adoption in engines. However, these new fuels possess unique chemical properties that, compared to traditional fuels, can more easily generate acidic substances during combustion, or produce more potent acidic substances. This results in engines using these fuels absorbing these acids more rapidly, leading to a more rapid decrease in the total base number (TBN). For example, in some engines fueled primarily by biodiesel, the TBN of the oil can quickly drop to a point where an oil change is necessary after a period of operation, posing a significant challenge to engine maintenance and upkeep. Summary of the Invention

[0005] The object of the present invention is to provide an oil filter which can keep the total base number of the engine oil within a reasonable range for a long time, thereby extending the service life of the engine oil and protecting the engine from running well.

[0006] To achieve the above objectives, the following technical solutions are provided:

[0007] Oil filter, including:

[0008] Protective shell;

[0009] a filter unit comprising an oil filter element disposed within the protective housing; the interior of the oil filter element being a clean side space, and the exterior of the oil filter element being a dirty side space; oil in the dirty side space being able to enter the clean side space through the oil filter element; and an oil pressure in the dirty side space being greater than an oil pressure in the clean side space;

[0010] The adding unit includes a filling tank and a guide pipe, wherein the filling tank is arranged in the protective shell and is filled with additives. The filling tank has an inlet and an outlet, the inlet is connected to the dirty side space, and the outlet is connected to the clean side space. One end of the guide pipe is inserted into the outlet, and the other end of the guide pipe extends into the filling tank and is located below the liquid level of the additive.

[0011] As an optional solution for the oil filter, the filling tank includes a cover body and a accommodating cavity, the cover body is sealed and buckled on the accommodating cavity, the cover body and the accommodating cavity are arranged to form a liquid storage tank for the additive, the inlet and the outlet are both arranged on the cover body, and the inlet and the outlet are both connected to the liquid storage tank.

[0012] As an optional solution for the oil filter, the cover body has a mounting boss on the side facing the oil filter element, the oil filter element is sleeved on the mounting boss, the mounting boss has a buffer groove, the bottom of the buffer groove is connected to the outlet, and the adding unit further includes:

[0013] A slow-release structure, one end of which is inserted into the cache slot, and the other end of which extends into the clean side space. A drainage channel is provided inside the slow-release structure, and both ends of the drainage channel are connected to the clean side space and the cache slot respectively.

[0014] As an optional solution for the oil filter, the adding unit further includes a first annular seal, and the first annular seal is sandwiched between the outer wall surface of the mounting boss and the inner wall surface of the oil filter element.

[0015] As an optional solution for the oil filter, a first annular limiting groove is circumferentially provided on the outer wall surface of the mounting boss, and part of the first annular sealing member is sleeved in the first annular limiting groove.

[0016] As an optional solution for the oil filter, the adding unit further includes a second annular seal, and the second annular seal is sandwiched between the outer wall surface of the slow-release structure and the inner wall surface of the buffer tank.

[0017] As an optional scheme of the oil filter, a second annular limiting groove is arranged on the outer wall surface of the slow-release structure in a circumferential direction, and part of the second annular sealing member is sleeved in the second annular limiting groove.

[0018] As an optional scheme of the oil filter, a first limiting step portion is arranged on the outer wall surface of the slow-release structure in a circumferential direction, a second limiting step portion is arranged on the inner wall surface of the buffer groove in a circumferential direction, and the first limiting step portion is stopped at the second limiting step portion.

[0019] As an optional scheme of the oil filter, the inner diameter of the flow guide channel and / or the flow guide pipe is 0.1 mm-5 mm.

[0020] As an optional scheme of the oil filter, a one-way valve is arranged in the inlet.

[0021] Compared with the prior art, the oil filter has the following beneficial effects:

[0022] The oil filter is characterized in that: the adding unit and the filtering unit are sequentially installed in the protective shell, and the oil filter is assembled on the oil circulation loop pipe of the engine. The oil in the oil circulation loop pipe enters the protective shell and is located in the dirty side space of the oil filter element of the filtering unit, and most of the oil enters the clean side space through the oil filter element under the push of oil pressure and is discharged from the protective shell. The inlet of the adding tank is communicated with the dirty side space, the outlet is communicated with the clean side space, one end of the flow guide pipe is inserted into the outlet, the other end of the flow guide pipe extends into the adding tank and is located below the liquid level of the additive, and the pressure difference between the dirty side space and the clean side space is utilized. A part of the oil flows into the adding tank through the inlet, and the pressure above the liquid level of the additive is increased, so that the additive flows into the clean side space through the flow guide pipe and the outlet and is mixed with the oil. The additive is added into the oil by utilizing the pressure difference of the oil filter, the TBN of the oil is kept in a reasonable range for a long time, the service life of the oil is prolonged, and the engine is protected to run well. 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 an assembly diagram of the oil filter in the embodiments of the present application;

[0025] Figure 2 It is a sectional view of the filtering unit in the embodiments of the present application;

[0026] Figure 3 A sectional view of the adding unit in the embodiment of the present application;

[0027] Figure 4 An enlarged view of the assembly of the adding unit and the filtering unit in the embodiment of the present application;

[0028] Figure 5 A sectional view of the slow-release structure in the embodiment of the present application.

[0029] Reference signs:

[0030] 100, protective shell; 200, filtering unit; 300, adding unit; 400, spring;

[0031] 1, one-way valve; 2, oil filter element; 3, filler neck; 4, flow guide pipe; 5, slow-release structure; 51, drainage channel; 52, second annular limiting groove; 53, first limiting step portion; 6, first annular sealing element; 7, second annular sealing element;

[0032] 21, clean side space; 22, dirty side space;

[0033] 31, inlet; 32, outlet; 33, cover body; 34, containing cavity; 35, mounting boss; 351, buffer groove; 3511, second limiting step portion; 352, first annular limiting groove. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0035] 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 when 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 therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0036] In the description of the present application, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "connected" should be understood broadly, for example, can be fixedly connected, can also be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0037] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0038] In order to keep the total base number of the engine oil in a reasonable range for a long time, prolong the service life of the engine oil, and protect the engine to run well, the present embodiment provides an engine oil filter, which is described below in combination with Figures 1 to 5 The specific content of the present embodiment is described in detail.

[0039] In the embodiment, the designed oil filter structure is exquisite and has high functional integration. The oil filter in the embodiment comprises a protective shell 100, a filtering unit 200 and an adding unit 300. The protective shell 100 serves as an external support structure of the whole oil filter, and provides a stable mounting space for the internal filtering unit 200 and adding unit 300, thereby playing a role of protecting the internal components from external collisions, dust and other interference, and ensuring that the oil filter can work normally in a complex and changeable engine operating environment. The filtering unit 200 is the core filtering part of the oil filter, and the key components of the filtering unit 200 comprise an oil filter element 2 which is accurately arranged in the protective shell 100. The unique structure design of the oil filter element 2 divides the internal space into a clean side space 21 and a dirty side space 22, that is, the inside of the oil filter element 2 is the clean side space 21, and the outside of the oil filter element 2 is the dirty side space 22. The oil in the dirty side space 22 can enter the clean side space 21 through the oil filter element 2, and the oil pressure in the dirty side space 22 is greater than that in the clean side space 21. During the operation of the engine, the oil in the oil circulation loop pipe will flow into the protective shell 100, and first enters the dirty side space 22 of the oil filter element 2. Since the oil in the dirty side space 22 has not been filtered and contains various impurities and pollutants, the clean side space 21 is the region where clean oil after filtering by the oil filter element 2 is located. According to the principle of fluid mechanics, the oil in the dirty side space 22 can enter the clean side space 21 through the tiny pores of the oil filter element 2 under the driving action of oil pressure, thereby realizing the preliminary purification of the oil. In addition, in order to ensure that the oil can smoothly pass through the filter element for filtering, the oil pressure in the dirty side space 22 is designed to be greater than that in the clean side space 21, and this pressure difference provides power for the filtration of the oil. The adding unit 300 comprises a filling tank 3 and a flow guide pipe 4. The filling tank 3 is also arranged in the protective shell 100, and the inside of the filling tank 3 is filled with an additive which can react with acidic substances in the oil. The filling tank 3 has an inlet 31 and an outlet 32. The inlet 31 is in communication with the dirty side space 22, and the outlet 32 is in communication with the clean side space 21. This design cleverly utilizes the pressure difference system inside the oil filter. The flow guide pipe 4 serves as a conveying channel for the additive. One end of the flow guide pipe 4 is accurately inserted into the outlet 32, and the other end of the flow guide pipe 4 extends into the filling tank 3 and is below the liquid level of the additive, thereby ensuring that the additive can smoothly flow out through the flow guide pipe 4.

[0040] In short, the oil filter provided by the present invention is installed by sequentially installing the filling unit 300 and the filtering unit 200 into the protective housing 100 in a specific order and position, and then assembling the entire oil filter onto the engine's oil circulation loop pipe. When the engine is started, the oil in the oil circulation loop pipe begins to flow and enters the protective housing 100, first being located in the dirty side space 22 of the oil filter element 2 of the filtering unit 200. At this point, most of the oil, driven by the strong oil pressure, quickly passes through the oil filter element 2 into the clean side space 21, and is eventually discharged from the protective housing 100, continuing to participate in the engine's lubrication and cooling cycles. In this process, since the inlet 31 of the filling tank 3 is connected to the dirty side space 22, and the outlet 32 ​​is connected to the clean side space 21, and the special design of the guide tube 4 utilizes the key factor of the pressure difference between the oil in the dirty side space 22 and the clean side space 21. Due to the pressure differential, some engine oil flows into the filling tank 3 through the inlet 31. As the oil continues to flow in, the pressure above the additive level in the filling tank 3 gradually increases. When the pressure reaches a certain level, the additive, driven by the pressure, flows through the guide tube 4 and the outlet 32 ​​into the clean side space 21, where it is thoroughly mixed with the filtered engine oil.

[0041] During engine operation, acids are inevitably produced. These acids enter the engine oil, causing the total base number (TBN) of the oil to gradually decrease. This oil filter cleverly utilizes a pressure differential to introduce additives into the oil. These additives neutralize the acids in the oil, effectively slowing the rate of decline in the TBN. This means the engine oil can maintain its TBN within a reasonable range for a longer period of time, providing continuous and stable lubrication and protection for the engine. A stable TBN helps maintain various engine performance indicators, such as lubricity, cleanliness, and rust prevention, thereby extending the oil's service life, reducing the frequency of oil changes, and lowering engine maintenance costs. Furthermore, stable oil performance better protects the engine's precision components, reduces wear and corrosion, ensures optimal engine operation under all operating conditions, improves engine reliability and durability, and provides a strong guarantee for safe driving.

[0042] It can be understood that the upper end of the oil filter in this embodiment is provided with an upper end cover (the upper end cover has multiple oil inlets on the periphery and an oil outlet at the center) to limit the position of the oil filter. This is an existing conventional technical means, so it will not be elaborated on.

[0043] Furthermore, the filling tank 3 includes a cover 33 and a receiving cavity 34. The receiving cavity 34 is the main part of the filling tank 3 and has sufficient internal space to store additives to meet the demand for large-capacity storage in a limited space. The cover 33 is firmly mounted on the receiving cavity 34 by means of a sealing buckle, effectively preventing the additive from leaking due to factors such as vibration and pressure changes during the operation of the engine. The cover 33 and the receiving cavity 34 work closely together to form a closed additive storage tank, providing a safe and stable storage environment for the additives. The sealed storage tank can effectively isolate the influence of the external high-temperature environment on the additives, prevent them from deteriorating or volatilizing due to excessive temperature, and ensure the chemical stability and effectiveness of the additives. At the same time, good sealing performance can also prevent external dust, impurities, etc. from entering the storage tank, preventing the additives from being contaminated, thereby ensuring that the additives added to the engine oil each time are pure and effective, providing a reliable guarantee for the stable improvement of the engine oil performance. To facilitate the circulation and addition of additives, an inlet 31 and an outlet 32 ​​are located on the cover 33. The inlet 31 ensures that the oil in the dirty-side chamber 22 flows smoothly into the reservoir, while the outlet 32 ​​ensures that the additives in the reservoir flow into the clean-side chamber 21 at a set flow rate and pressure. Both the inlet 31 and the outlet 32 ​​are directly connected to the reservoir, forming a complete fluid pathway that allows the oil and additives to flow and mix in an orderly manner within the refill tank 3.

[0044] Further, the cover 33 has a mounting boss 35 on the side facing the oil filter element 2 to ensure the fit with the oil filter element 2. The oil filter element 2 is sleeved on the mounting boss 35, and the mounting boss 35 has a buffer groove 351, the groove bottom of which is in communication with the outlet 32. The adding unit 300 further comprises a slow-release structure 5, one end of which is inserted into the buffer groove 351, and the other end of which extends into the clean side space 21 of the oil filter element 2. The slow-release structure 5 has a drainage channel 51 passing through inside, and the two ends of the drainage channel 51 are in communication with the clean side space 21 and the buffer groove 351, respectively. The mounting boss 35 is provided on the cover 33 and the oil filter element 2 is sleeved thereon, which greatly enhances the structural stability of the entire oil filter. When the engine is running at high speed, strong vibration and impact force will be generated. The mounting boss 35 provides a stable support platform for the oil filter element 2, effectively preventing the oil filter element 2 from shaking and shifting, and avoiding problems such as oil leakage and reduced filtering effect caused by loose filter element. At the same time, the precise fit design of the mounting boss 35 and the oil filter element 2 ensures the sealing between them, preventing the oil from bypassing the filter and directly entering the clean side space 21 during flow, ensuring the filtering quality of the oil, providing clean lubricating oil for the engine, and prolonging the service life of the engine. The buffer groove 351 plays a key buffering and adjusting role in the process of adding additives. When the additives flow out of the outlet 32 of the adding tank 3, they first enter the buffer groove 351 for temporary storage. Since the buffer groove 351 has a certain volume, it can balance the flow fluctuation of the additives, avoiding the problem of uneven addition of additives due to instantaneous excessive flow of the outlet 32. During engine operation, the flow and pressure of the oil will change with the working condition. The buffer groove 351 can stably provide additives to the slow-release structure 5 according to the actual demand of the oil, ensuring that the amount of additives remains within a relatively stable range, thereby achieving precise adjustment of the total base number (TBN) of the oil. The slow-release structure 5 and the drainage channel 51 inside it are the core part of the entire adding unit 300, which realizes the stable and controllable slow release of additives. The diameter, length and bending degree of the drainage channel 51 can be designed according to the actual use, so as to adjust the speed of the additives entering the clean side space 21 from the buffer groove 351. This slow-release method avoids the one-time large amount of additives entering the oil, prevents the negative impact on the performance of the oil due to the high concentration of additives, and also ensures that the additives can be fully mixed with the oil, improving the effect of neutralizing acidic substances. In addition, the design of the slow-release structure 5 stably inserted into the buffer groove 351 and extending into the clean side space 21 ensures that the slow-release process of the additives is not disturbed by external factors during long-term engine operation, and remains stable and reliable. Through the synergistic effect of the above structures, the appropriate amount of additives is accurately and stably added to the oil in the clean side space 21.Additives rapidly neutralize the acidic substances in the engine oil, effectively reducing its acidity and maintaining its total base number (TBN) within a reasonable range. This not only extends the oil's lifespan, reduces the frequency of oil changes, and lowers operating costs, but also enhances its lubrication, cleanliness, and rust prevention properties. Clean, stable engine oil provides better lubrication and protection for the engine's precision components, reducing wear and corrosion, lowering the incidence of engine failures, and ensuring efficient and stable engine operation under all operating conditions, thereby enhancing overall engine performance and reliability.

[0045] Furthermore, a spring 400 is provided in the protective shell 100 of the oil filter. The spring 400 is installed between the bottom of the filling tank 3 and the inner bottom wall of the protective shell. The spring 400 is in a compressed state. The spring 400 can lift the filling tank 3 and press it toward the oil filter element 2, ensuring the stability of the docking between the oil filter element 2 and the mounting protrusion on the filling tank 3.

[0046] A spring 400 is strategically positioned within the oil filter's protective housing 100. Spring 400 possesses high strength and excellent elasticity, maintaining a stable elastic restoring force under long-term pressure and resisting plastic deformation. Spring 400 is precisely installed between the bottom of the refill tank 3 and the inner bottom wall of the protective housing, ensuring that the central axis of spring 400 aligns perpendicularly with the refill tank 3 and the inner bottom wall of the protective housing. This ensures that spring 400 exerts its elastic force evenly when subjected to force. Once installed, spring 400 is compressed, releasing its stored elastic potential energy to generate an upward force. This force acts on the bottom of the refill tank 3, firmly lifting it and pressing it continuously and evenly against the oil filter 2. Under the force of spring 400, the refill tank 3 is lifted and pressed against the oil filter 2, ensuring a secure connection between the oil filter 2 and the mounting boss on the refill tank 3. This secure connection is crucial for the proper functioning of the oil filter. During the oil filtration process, oil flows into the oil filter cartridge 2 from one side and exits from the other side after being filtered by the oil filter cartridge 2. If the connection between the refill tank 3 and the oil filter cartridge 2 is not secure, oil may leak at the connection point, causing some unfiltered oil to enter the engine's lubrication system, reducing the oil filtration efficiency and preventing the effective cleaning and protection of internal engine components, increasing the risk of wear and failure. Furthermore, for the additive addition function of the refill tank 3, a secure connection ensures that the additives can accurately and smoothly enter the clean side space 21 of the oil filter cartridge 2 through the mounting protrusion, fully mixing with the filtered oil, achieving precise adjustment of the total base number (TBN) of the oil and maintaining stable oil performance. The engine generates strong vibrations during operation, which can be transmitted to the oil filter. Without the action of spring 400, the connection between the refill tank 3 and the oil filter cartridge 2 may gradually loosen due to the vibration, resulting in a loose connection or even separation. Spring 400 is compressed and has an elastic restoring force, automatically adjusting the position of the filling tank 3 when vibration occurs, maintaining pressure on the oil filter 2 and ensuring a stable connection. Whether the engine is running at low or high speed, whether driving smoothly or on bumpy roads, spring 400 can exert its buffering and stabilizing effects, ensuring that the oil filter remains in good working condition during long-term use, reducing the number of failures and repairs caused by loose connections, and improving the reliability and service life of the oil filter. During the actual assembly process, due to factors such as the machining accuracy of components and the assembly process, certain assembly errors may occur. For example, there may be a certain deviation in the distance between the filling tank 3 and the bottom wall of the protective shell, or the installation position of the oil filter 2 may not be precise enough. The elastic properties of spring 400 can effectively compensate for these assembly errors.When there is an assembly error, the spring 400 can automatically adjust its compression amount according to the actual situation, so that the filling tank 3 can still accurately press against the oil filter element 2, ensuring the stability of the docking of the mounting protrusion with the oil filter element 2. This compensation reduces the strict requirements for the machining precision and assembly process of the parts, improves the assembly efficiency and quality, and reduces the product rejection rate caused by assembly problems. Moreover, by setting the spring 400 to realize the stable docking of the filling tank 3 and the oil filter element 2, compared with other complex mechanical connection structures such as bolt connection and buckle connection, it has the advantages of simple structure, easy manufacturing and installation. The structure of the spring 400 is relatively simple, which only needs to be made of a suitable spring 400 wire, and its manufacturing process is mature and the cost is low. Moreover, the installation process of the spring 400 is also very simple, which only needs to be placed between the bottom of the filling tank 3 and the inner bottom wall of the protective shell, without the need for additional tools and complex operation steps. This simplified structure design not only reduces the manufacturing cost of the oil filter, but also facilitates the maintenance and replacement of the product, improving the market competitiveness of the product.

[0047] Further, the adding unit 300 further comprises a first annular sealing member 6, which is made of rubber material with excellent sealing performance and oil and temperature resistance to ensure the sealing requirement between the mounting boss 35 and the oil filter element 2. The first annular sealing member 6 is clamped between the outer wall surface of the mounting boss 35 and the inner wall surface of the oil filter element 2. The first annular sealing member 6 is clamped between the outer wall surface of the mounting boss 35 and the inner wall surface of the oil filter element 2, forming a reliable sealing barrier. When the oil filter is working, the oil will flow between the oil filter element 2 and the mounting boss 35 under a certain pressure. The first annular sealing member 6 can tightly fit the wall surfaces of the mounting boss 35 and the oil filter element 2 due to its good elasticity and sealing performance, effectively preventing the oil from leaking out of the gap between them. This sealing effect ensures that the oil can pass through the oil filter element 2 according to the predetermined path for filtration, prevents unfiltered oil from bypassing the filter element and directly entering the engine lubrication system, thereby ensuring the filtration quality of the oil and providing clean lubricating oil for the engine, reducing the wear and corrosion of internal parts of the engine, and prolonging the service life of the engine.

[0048] Furthermore, the outer wall of the mounting boss 35 is circumferentially provided with a first annular retaining groove 352, within which a portion of the first annular seal 6 is positioned. The first annular retaining groove 352, circumferentially disposed on the outer wall of the mounting boss 35, provides precise positioning and a stable mounting foundation for the first annular seal 6. During assembly of the oil filter, the operator can easily fit the first annular seal 6 within the first annular retaining groove 352, significantly improving assembly efficiency and accuracy. During operation, the first annular seal 6 is subjected to various forces due to engine vibration and the flow of oil. The first annular retaining groove 352 limits the movement of the first annular seal 6, preventing it from shifting or being squeezed out under the action of forces. This ensures that the first annular seal 6 is always in the correct sealing position, maintaining a good seal. This stable installation method reduces the risk of seal failure caused by seal displacement, thereby improving the reliability and stability of the oil filter. The first annular seal 6 also provides a certain degree of vibration and noise reduction. During engine operation, vibration and noise are generated, which are transmitted through the oil filter's structure. The first annular seal 6 forms a flexible buffer layer between the mounting boss 35 and the oil filter element 2, absorbing and attenuating some of the vibration energy and reducing vibration transmission. It also reduces noise generated by component collisions, making the oil filter quieter during operation. This vibration and noise reduction effect not only improves driving comfort but also reduces noise pollution to the surrounding environment.

[0049] Furthermore, the adding unit 300 also includes a second annular seal 7, which is sandwiched between the outer wall of the slow-release structure 5 and the inner wall of the buffer tank 351. The second annular seal 7 is sandwiched between the outer wall of the slow-release structure 5 and the inner wall of the buffer tank 351, building a solid sealing line to prevent leakage of additives. During the operation of the oil filter, the buffer tank 351 stores additives to be slowly released. These additives may try to seep out from the gap between the slow-release structure 5 and the buffer tank 351 under the action of pressure. The second annular seal 7, with its excellent elasticity and sealing performance, can fit tightly to the wall of the slow-release structure 5 and the buffer tank 351, effectively blocking the leakage of additives and ensuring that the additives can only be slowly released through the drainage channel 51 inside the slow-release structure 5. This reliable sealing effect ensures the accuracy of the amount of additives added to the engine oil, thereby maintaining the total base number (TBN) of the engine oil within a reasonable range, providing stable lubrication and protection for the engine.

[0050] Furthermore, a second annular limiting groove 52 is circumferentially provided on the outer wall surface of the slow-release structure 5, and part of the second annular seal 7 is sleeved in the second annular limiting groove 52. The second annular limiting groove 52 provides a precise positioning and stable installation basis for the second annular seal 7. During the assembly process, the operator can easily sleeve the second annular seal 7 in the second annular limiting groove 52, which greatly improves the efficiency and accuracy of the assembly. In the working state, due to the vibration of the engine and the flow impact of the additive in the buffer groove 351, the second annular seal 7 will be subjected to various forces. The second annular limiting groove 52 can limit the movement range of the second annular seal 7, prevent it from being offset or extruded under the action of force, and ensure that the second annular seal 7 is always in the correct sealing position to maintain a good sealing state. This stable installation method reduces the problem of sealing failure caused by seal displacement, and improves the reliability and stability of the entire adding unit 300.

[0051] Furthermore, a first limiting step 53 is circumferentially provided on the outer wall of the slow-release structure 5, and a second limiting step 3511 is circumferentially provided on the inner wall of the buffer tank 351. The first limiting step 53 is abutted against the second limiting step 3511. The cooperation between the first limiting step 53 and the second limiting step 3511 forms a reliable mechanical limiting structure. When the slow-release structure 5 is installed in the buffer tank 351, the first limiting step 53 abuts against the second limiting step 3511, clearly limiting the installation depth and axial movement range of the slow-release structure 5. This design has multiple important functions. On the one hand, it prevents the slow-release structure 5 from being over-inserted during installation; on the other hand, during operation, when subjected to external forces such as engine vibration or changes in additive pressure, the mechanical limiting structure prevents axial movement of the slow-release structure 5, ensuring that the relative position between the slow-release structure 5 and the buffer tank 351 remains stable. This not only ensures the normal operation of the second annular seal 7, but also ensures the accuracy of the connection between the drainage channel 51 inside the slow-release structure 5 and the cache groove 351 and the clean side space 21 of the oil filter element 2, so that additives can be continuously and stably added to the engine oil.

[0052] Exemplarily, the inner diameter of the drainage channel 51 and / or the guide tube 4 is 0.1mm-5mm. The inner diameter of the drainage channel 51 and / or the guide tube 4 is set in the range of 0.1mm-5mm, which can achieve precise control of the flow rate of the additive. According to the principles of fluid mechanics, under certain pressure conditions, the flow rate of the fluid is proportional to the square of the inner diameter of the pipe. When the inner diameter is small, such as close to 0.1mm, the flow rate of the additive will be relatively small and stable. This is crucial for some engine oil formulations that require extremely precise additive addition amounts. For example, in some high-performance engine oils, the amount of additive added needs to be accurate to the microgram level. A smaller inner diameter can precisely control the pressure and time, so that the additive is added to the oil at an extremely slow and stable flow rate, ensuring that the total base number (TBN) of the oil accurately meets the design requirements, thereby providing the engine with optimal lubrication and corrosion protection. When the inner diameter is larger, such as close to 5mm, the flow rate of the additive will increase accordingly. In some operating conditions where additives need to be quickly replenished, such as when the acid value of the engine oil rises sharply after the engine has been running at high load for a long time, a larger inner diameter can ensure that a sufficient amount of additives is added to the engine oil in a relatively short period of time, quickly neutralizing the acidic substances in the engine oil, restoring the performance of the engine oil, and extending the service life of the engine oil. The appropriate inner diameter range helps to ensure the stability of the flow rate of the additive in the drainage channel 51 and / or the guide tube 4. If the inner diameter is too large, the flow rate of the additive in the pipeline may be affected by factors such as oil flow and engine vibration, resulting in large fluctuations. The unstable flow rate will lead to uneven dispersion of the additive in the engine oil, with the additive concentration in some areas being too high and in some areas being too low, affecting the overall performance of the engine oil. The inner diameter range of 0.1mm-5mm can enable the additive to form a relatively stable laminar flow state in the pipeline. In the laminar flow state, the movement of the additive molecules is relatively orderly and the flow rate distribution is uniform, which can ensure that the additive is added to the engine oil at a constant rate, so that the additive can be fully mixed and dispersed in the engine oil, improving the performance consistency of the engine oil.

[0053] Furthermore, a one-way valve 1 is provided in the inlet 31. By adding the one-way valve 1, the one-way valve 1 ensures that only the engine oil in the dirty side space 22 is allowed to enter the filling tank 3, preventing the additive in the filling tank 3 from flowing back to the dirty side space 22, which can effectively avoid the occurrence of cross-contamination problems. Optionally, the installation position of the one-way valve 1 is located at the center of the inlet 31, so that when the engine oil flows in, it can smoothly push the valve core to open, and when it flows in the opposite direction, it can quickly close the valve to form a reliable seal. When the engine oil flows from the dirty side space 22 to the filling tank 3, the engine oil in the dirty side space 22 has a certain pressure. This pressure will overcome the elastic force of the spring 400 in the one-way valve 1, push the valve core to move, thereby opening the valve, so that the engine oil can smoothly enter the filling tank 3. If the pressure in the refill tank 3 rises abnormally or the system experiences reverse pressure fluctuations, the spring 400 in the one-way valve 1 quickly presses the valve core back into position, tightly fitting it against the valve seat, forming a tight seal that effectively prevents the additive in the refill tank 3 from flowing back into the dirty-side space 22. If the additive flows back into the dirty-side space 22, it will mix with various contaminants in the dirty engine oil, causing chemical changes in the additive, potentially causing precipitation, agglomeration, and other undesirable phenomena, clogging the oil filter 2, and affecting the normal circulation and lubrication of the engine oil.

[0054] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. Oil filter, characterized in that, include: A protective housing (100); The filter unit (200) comprises an oil filter element (2), the oil filter element (2) being arranged in the protective housing (100), the interior of the oil filter element (2) being a clean side space (21), the exterior of the oil filter element (2) being a dirty side space (22), the oil in the dirty side space (22) being able to enter the clean side space (21) through the oil filter element (2), and the oil pressure of the oil in the dirty side space (22) being greater than the oil pressure of the oil in the clean side space (21); The adding unit (300) comprises a filling tank (3) and a flow guide pipe (4), wherein the filling tank (3) is arranged in the protective shell (100), the filling tank (3) is filled with additives, the filling tank (3) has an inlet (31) and an outlet (32), the inlet (31) is connected to the dirty side space (22), and the outlet (32) is connected to the clean side space (21), one end of the flow guide pipe (4) is inserted into the outlet (32), and the other end of the flow guide pipe (4) extends into the filling tank (3) and is located below the liquid level of the additive.

2. The oil filter according to claim 1, characterized in that The filling tank (3) comprises a cover (33) and a receiving cavity (34); the cover (33) is sealed and buckled on the receiving cavity (34); the cover (33) and the receiving cavity (34) are arranged to form a liquid storage tank for the additive; the inlet (31) and the outlet (32) are both arranged on the cover (33); and the inlet (31) and the outlet (32) are both communicated with the liquid storage tank.

3. The oil filter according to claim 2, characterized in that The cover (33) has a mounting boss (35) on one side facing the oil filter element (2), the oil filter element (2) is sleeved on the mounting boss (35), the mounting boss (35) has a buffer groove (351), the bottom of the buffer groove (351) is in communication with the outlet (32), and the adding unit (300) further comprises: A slow-release structure (5), one end of the slow-release structure (5) is inserted into the buffer groove (351), and the other end of the slow-release structure (5) extends into the clean side space (21); a drainage channel (51) is provided through the interior of the slow-release structure (5), and the two ends of the drainage channel (51) are respectively connected to the clean side space (21) and the buffer groove (351).

4. The oil filter according to claim 3, characterized in that The adding unit (300) further comprises a first annular seal (6), and the first annular seal (6) is sandwiched between the outer wall surface of the mounting boss (35) and the inner wall surface of the oil filter element (2).

5. The oil filter according to claim 4, characterized in that A first annular limiting groove (352) is circumferentially provided on the outer wall surface of the mounting boss (35), and a portion of the first annular sealing member (6) is sleeved in the first annular limiting groove (352).

6. The oil filter according to claim 3, characterized in that The adding unit (300) further includes a second annular seal (7), and the second annular seal (7) is sandwiched between the outer wall surface of the slow-release structure (5) and the inner wall surface of the buffer groove (351).

7. The oil filter according to claim 6, characterized in that A second annular limiting groove (52) is circumferentially provided on the outer wall surface of the slow-release structure (5), and a portion of the second annular sealing member (7) is sleeved in the second annular limiting groove (52).

8. The oil filter according to claim 3, characterized in that The outer wall surface of the slow-release structure (5) is circumferentially provided with a first limiting step portion (53), and the inner wall surface of the buffer groove (351) is circumferentially provided with a second limiting step portion (3511), and the first limiting step portion (53) is stopped at the second limiting step portion (3511).

9. The oil filter according to claim 3, characterized in that The inner diameter of the drainage channel (51) and / or the drainage tube (4) is 0.1 mm to 5 mm.

10. The oil filter according to any one of claims 1 to 9, characterized in that: A one-way valve (1) is provided in the inlet (31).

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