A dual filter oil filter

Abstract

The application relates to the technical field of oil filters, in particular to a double-filtering type oil filter which comprises a shell, a primary separation assembly, a secondary filtering assembly and an automatic blowdown device. The primary separation assembly realizes pre-separation of large-particle impurities through a flow guide plate and a centrifugal chamber, a sedimentation tank concentrates and deposits impurities and discharges the impurities through the automatic blowdown device; the secondary filtering assembly adopts a double-layer filter element design, the outer filter element intercepts larger particles, the inner filter element performs deep filtration, and a separation support optimizes a flow path; the automatic blowdown device monitors pressure changes through a differential pressure sensor and drives a blowdown valve to open. The application realizes graded treatment of impurities, avoids blockage, reduces maintenance frequency, and improves filtering efficiency and economy.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical equipment lubrication and filtration technology, specifically a dual-filtration type oil filter. Background Technology

[0002] With the continuous development of engine lubrication system technology, the oil filter, as a key component ensuring the normal operation of the engine, directly affects the engine's reliability and service life. To improve oil cleanliness, various oil filter structures with multiple filtration functions have been proposed in existing technologies, aiming to effectively remove impurities, metal wear debris, and other contaminants from the oil through a multi-stage filtration mechanism. However, existing dual or series filtration structures still suffer from problems in practical applications, such as unreasonable filtration paths, incomplete impurity interception, easy clogging of the filter element, and high maintenance costs.

[0003] A search revealed a series-type oil filter with publication number CN106762021B, published on May 2, 2023. This patent proposes a series-type filtration structure, including a coarse filter and a fine filter. Engine oil undergoes secondary filtration by passing through both the coarse and fine filters sequentially, with a backflow preventer between them to prevent backflow. This structure significantly improves oil cleanliness through two-stage filtration, reduces wear on friction pairs, and extends engine life. However, this solution has significant shortcomings: its coarse and fine filters are fixed in series, and impurities tend to accumulate at the coarse filter end, easily causing blockage of the front channel, leading to a rapid increase in system pressure differential and affecting oil flow efficiency. Simultaneously, the lack of an effective pre-separation mechanism for large particles results in excessive load on the coarse filter, shortening the overall filter element lifespan. Furthermore, this structure lacks bypass protection or a self-cleaning function, posing a risk of lubrication interruption under extreme operating conditions.

[0004] A search revealed an oil filter with publication number CN105971687B, published on December 25, 2018. This patent proposes a dual-chamber filtration structure comprising a first and a second filter element. Multiple chambers are formed through the cooperation of a base and a housing, enabling staged filtration of the oil. The second filter element, located on the outer periphery of the base, further deepens the filtration of the oil, improving its ability to capture metallic impurities. While this structure achieves a spatially dual filtration layout, it still has significant drawbacks: its filtration path design is unreasonable; the second filter element, located downstream but at a low position, is susceptible to interference from deposited impurities, leading to accelerated filter contamination. Furthermore, there is no effective isolation or flow guiding structure between the two filter elements, posing a risk of filtration short-circuiting, allowing some oil to bypass the first stage of filtration and directly enter the second stage, reducing overall filtration efficiency. In addition, this structure lacks filter status monitoring or an automatic draining device, relying on periodic replacement for maintenance, and cannot achieve dynamic control during operation or effective removal of impurities.

[0005] The aforementioned problems indicate that existing dual-filtration oil filters still have significant shortcomings in terms of filtration path design, impurity classification and treatment, anti-clogging capability, and operational reliability, making it difficult to meet the demands of modern engines for efficient, stable, and long-life oil filtration systems. Therefore, this invention provides a dual-filtration oil filter that, by optimizing the layout of the inner and outer double-layer filter elements, setting up flow guiding and settling chambers, and introducing an automatic sewage discharge and differential pressure balancing mechanism, achieves efficient graded filtration and continuous stable operation of the oil. This overcomes the shortcomings of existing technologies, such as incomplete filtration, easy clogging, and frequent maintenance, thereby improving overall filtration performance and economic efficiency. Utility Model Content

[0006] This utility model relates to a dual-filtration oil filter, comprising a housing, a primary separation component, a secondary filtration component, and an automatic drain device. The housing contains the primary separation component and the secondary filtration component. The primary separation component is located at the oil inlet end of the housing, and the secondary filtration component is installed inside the housing near the oil outlet end. An automatic drain device is provided at the bottom of the housing to discharge large particulate impurities separated by the primary separation component.

[0007] The primary separation assembly includes a guide plate, a centrifugal chamber, and a settling tank. The guide plate is fixedly installed at the oil inlet of the housing, and its inner surface has a spiral structure, which is fixed to the inner wall of the housing by bolts. The outer side of the guide plate is connected to the centrifugal chamber, which is a cylindrical structure with several radially protruding guide ribs evenly distributed on its inner wall. The guide ribs extend along the axial direction of the inner wall of the centrifugal chamber to guide the oil to form a swirling motion in the chamber. A settling tank is provided at the bottom of the centrifugal chamber. The settling tank has an inverted conical cross-section and a slag discharge hole at the center of its bottom. The slag discharge hole is connected to an automatic sewage discharge device through a pipe.

[0008] The secondary filtration assembly includes an outer filter element, an inner filter element, and a separation bracket. The outer filter element has a cylindrical structure with a gap between its outer wall and the inner wall of the housing to form an annular channel. The inner filter element is coaxially mounted inside the outer filter element, and its filtration accuracy is higher than that of the outer filter element. The separation bracket is fixedly connected between the outer and inner filter elements to maintain their relative position stability. Several guide vanes are provided on the outer side of the separation bracket, and these guide vanes are evenly distributed along the axial direction of the separation bracket to guide the flow path of the oil between the outer and inner filter elements.

[0009] The automatic sewage discharge device includes a sewage discharge valve, a differential pressure sensor, and a control unit. The sewage discharge valve is installed at the slag discharge hole at the bottom of the housing. The differential pressure sensor is installed at both ends of the primary separation component to detect the pressure difference before and after the primary separation component. The control unit is electrically connected to the differential pressure sensor and the sewage discharge valve. When the pressure difference detected by the differential pressure sensor exceeds a preset value, the control unit sends a signal to drive the sewage discharge valve to open and discharge large particulate impurities in the settling tank.

[0010] This invention incorporates a guide plate and a centrifugal chamber in the primary separation component. The spiral structure of the guide plate guides the oil into the centrifugal chamber, creating a swirling motion. This causes large particles of impurities to settle in the settling tank under centrifugal force, effectively pre-separating them and reducing the burden on subsequent filtration components. Simultaneously, the inverted conical design of the settling tank facilitates concentrated impurity deposition, which is promptly discharged by an automatic draining device, preventing clogging caused by impurity accumulation.

[0011] The secondary filter assembly employs a dual-layer layout with an outer filter element and an inner filter element. The outer filter element intercepts larger particulate impurities, while the inner filter element further filters the engine oil to ensure its cleanliness. The guide vanes on the isolation bracket optimize the oil flow path, preventing filter short-circuiting and improving overall filtration efficiency.

[0012] The automatic drain device monitors the pressure changes of the primary separation component in real time using a differential pressure sensor. When the pressure difference exceeds a set value, it indicates that the impurities in the settling tank have reached a certain amount. At this point, the control unit drives the drain valve to open, discharging the impurities. This design not only achieves dynamic control during operation but also reduces maintenance frequency and extends the service life of the filter element.

[0013] This invention optimizes the oil filtration path through the aforementioned technical means, achieves graded treatment of impurities, solves the problems of incomplete filtration, easy clogging, and frequent maintenance in the prior art, and improves the overall performance and economic efficiency of the oil filter. Attached Figure Description

[0014] Fig. 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Fig. 2 This is a schematic diagram of the front view sectional structure of this utility model.

[0016] Fig. 3 This is a schematic diagram of the internal three-dimensional structure of this utility model.

[0017] The reference numerals in the attached diagram are as follows: 1. Shell; 2. Primary separation assembly; 3. Secondary filtration assembly; 4. Automatic sewage discharge device; 5. Guide plate; 6. Centrifuge chamber; 7. Settling tank; 8. Sludge discharge hole; 9. Outer filter element; 10. Inner filter element; 11. Isolation bracket; 12. Guide plate; 13. Sludge discharge valve; 14. Differential pressure sensor; 15. Control unit. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0019] Specific implementation examples are given below.

[0020] This utility model provides a dual-filtration oil filter, the overall structure of which is as follows: Figs. 1-3 As shown, it includes a housing 1, a primary separation component 2, a secondary filtration component 3, and an automatic sewage discharge device 4. The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0021] The housing 1 is a cylindrical hollow structure, housing a primary separation component 2 and a secondary filter component 3. The primary separation component 2 is located at the oil inlet of the housing 1, and the secondary filter component 3 is installed inside the housing 1 near the oil outlet. An automatic drain device 4 is installed at the bottom of the housing 1 to discharge large particulate impurities separated by the primary separation component 2. The oil inlet of the housing 1 is connected to an external oil pipeline, and the oil outlet is connected to the engine fuel supply system. The inner wall of the housing 1 is precision machined to ensure sealing and stability between the housing 1 and the components.

[0022] The primary separation assembly 2 includes a guide plate 5, a centrifugal chamber 6, and a settling tank 7. The guide plate 5 is fixedly installed at the oil inlet of the housing 1 and fastened to the inner wall of the housing 1 with bolts. The inner surface of the guide plate 5 has a spiral structure with an optimized spiral angle to ensure that the oil flows along a predetermined path when it enters. The outer side of the guide plate 5 is connected to the centrifugal chamber 6, which is a cylindrical structure with several radially protruding guide ribs evenly distributed on its inner wall. These guide ribs extend axially along the inner wall of the centrifugal chamber 6, and their number and height are adjusted according to actual working conditions to guide the oil to form a stable swirling motion within the chamber. A settling tank 7 is provided at the bottom of the centrifugal chamber 6. The cross-sectional shape of the settling tank 7 is an inverted cone shape, which facilitates the concentrated deposition of large particles of impurities. A slag discharge hole 8 is provided at the center of the bottom of the settling tank 7, and the slag discharge hole 8 is connected to an automatic sewage discharge device 4 through a pipe. The diameter of the slag discharge hole 8 is precisely calculated to ensure that impurities can be effectively discharged without causing oil leakage.

[0023] The secondary filter assembly 3 includes an outer filter element 9, an inner filter element 10, and a separator 11. The outer filter element 9 has a cylindrical structure with a gap between its outer wall and the inner wall of the housing 1, forming an annular channel to guide the oil flow from the primary separator 2 to the secondary filter assembly 3. The inner filter element 10 is coaxially mounted inside the outer filter element 9, and its filtration accuracy is higher than that of the outer filter element 9. Both the outer filter element 9 and the inner filter element 10 are made of multi-layer composite materials, and their materials and pore sizes are strictly selected to meet the filtration requirements of impurities of different particle sizes. The separator 11 is fixedly connected between the outer filter element 9 and the inner filter element 10, and has several guide vanes 12 on its outer side. The guide vanes 12 are evenly distributed along the axial direction of the separator 11, and their number and angle are optimized to guide the flow path of the oil between the outer filter element 9 and the inner filter element 10, avoiding short-circuiting of the filter. The isolation bracket 11 is fixedly connected to the outer filter element 9 and the inner filter element 10 by welding or snap-fit, ensuring that the two maintain a stable relative position during operation.

[0024] The automatic sewage discharge device 4 includes a sewage discharge valve 13, a differential pressure sensor 14, and a control unit 15. The sewage discharge valve 13 is installed at the slag discharge hole 8 at the bottom of the housing 1, with its valve body connected to the slag discharge hole 8 by threads and equipped with a sealing ring to prevent oil leakage. The differential pressure sensor 14 is installed at both ends of the primary separation component 2, with its probe embedded in the inner wall of the housing 1 and in direct contact with the engine oil. The differential pressure sensor 14 is electrically connected to the control unit 15 via a signal line. The control unit 15 is fixedly installed on the outside of the housing 1 and connected to the sewage discharge valve 13 via a cable. When the differential pressure sensor 14 detects that the pressure difference before and after the primary separation component 2 exceeds a preset value, the control unit 15 sends an electrical signal to drive the sewage discharge valve 13 to open, discharging large particulate impurities from the settling tank 7. The opening time and frequency of the sewage discharge valve 13 are dynamically adjusted by the control unit 15 according to the actual working conditions to achieve automated control during operation.

[0025] During actual operation, the engine oil flows in from the inlet of the housing 1 and is first guided into the centrifugal chamber 6 by the spiral structure of the guide plate 5. Inside the centrifugal chamber 6, the engine oil is subjected to the action of the guide ribs to form a swirling motion. Large particles of impurities are thrown against the inner wall of the chamber under the action of centrifugal force and gradually deposit in the settling tank 7. The inverted conical design of the settling tank 7 allows impurities to slide down the conical surface to the slag discharge hole 8 at the bottom center. When the differential pressure sensor 14 detects that the pressure difference before and after the primary separation component 2 exceeds the set value, the control unit 15 sends a signal to drive the drain valve 13 to open, discharging the impurities in the settling tank 7 through the slag discharge hole 8. The engine oil treated by the primary separation component 2 continues to flow to the secondary filter component 3. The engine oil first passes through the outer filter element 9 to intercept larger particles of impurities, and then enters the inner filter element 10 for deep filtration. The guide plate 12 on the isolation bracket 11 optimizes the flow path of the engine oil, making it evenly distributed between the inner and outer filter elements, thereby improving the overall filtration efficiency. Finally, the cleaned engine oil, after undergoing double filtration, flows out from the oil outlet of housing 1 and enters the engine oil supply system.

[0026] This invention achieves graded filtration of engine oil through the aforementioned structure and operating process. The primary separation component 2 utilizes the synergistic effect of the guide plate 5 and the centrifugal chamber 6 to pre-separate large particulate impurities, reducing the burden on subsequent filtration components. The inverted conical design of the settling tank 7, combined with the automatic drain device 4, ensures timely discharge of impurities, preventing clogging caused by impurity accumulation. The secondary filtration component 3 employs a double-layer filter element layout, further improving the cleanliness of the engine oil. The automatic drain device 4 monitors the pressure changes of the primary separation component 2 in real time through the differential pressure sensor 14 and dynamically adjusts the opening state of the drain valve 13 according to actual operating conditions, thereby achieving automated control during operation, reducing maintenance frequency, and extending the service life of the filter element.

[0027] This invention is applicable to oil filtration systems for various types of internal combustion engines, and performs particularly well under high-load and high-pollution environments. Through the implementation of the above technical solution, this invention solves the problems of incomplete filtration, easy clogging, and frequent maintenance in existing technologies, significantly improving the overall performance and economic efficiency of oil filters. To better enable those skilled in the art to fully understand and implement this invention, the specific implementation principle is further explained below with reference to a specific application scenario.

[0028] In practical applications, taking a certain type of diesel engine as an example, its operating environment is high-load and dusty, and the engine oil contains a large amount of metal wear debris and particulate impurities. After the engine starts, the engine oil flows into the filter through the oil inlet of the housing 1 via the external oil pipe. First, the engine oil enters the guide plate 5 area of ​​the primary separation component 2. The spiral structure of the guide plate 5 guides the engine oil to the centrifugal chamber 6, where the engine oil moves along the swirling path formed by the guide ribs. Due to the centrifugal force, large particulate impurities are thrown against the inner wall of the centrifugal chamber 6 and gradually deposit in the settling tank 7. The inverted conical design of the settling tank 7 allows impurities to slide down the conical surface to the slag discharge hole 8 at the bottom center, forming a concentrated accumulation.

[0029] When large particles of impurities accumulate to a certain extent in the settling tank 7, the pressure difference before and after the primary separation component 2 gradually increases. The differential pressure sensor 14 monitors this change in real time and transmits the signal to the control unit 15. When the pressure difference exceeds a preset value, the control unit 15 sends an electrical signal to drive the drain valve 13 to open, and the impurities in the settling tank 7 are discharged from the housing 1 through the slag discharge hole 8. This process ensures the unobstructed flow of the primary separation component 2 and avoids blockage problems caused by impurity accumulation. At the same time, the diameter of the slag discharge hole 8 is precisely calculated to ensure the effective discharge of impurities and prevent oil leakage, thereby maintaining the system's sealing and stability.

[0030] After being processed by the primary separation component 2, the engine oil continues to flow to the secondary filter component 3. The oil first enters the outer filter element 9, which is made of multi-layer composite material and has a larger pore size that effectively intercepts larger particulate impurities. Subsequently, the oil passes through the separator bracket 11 into the inner filter element 10. The inner filter element 10 has a smaller pore size, enabling deep filtration of the oil and further removal of fine particulate impurities. The guide vanes 12 on the separator bracket 11 optimize the oil flow path, ensuring even distribution between the inner and outer filter elements and preventing filtration short-circuiting caused by excessive local flow. This dual-layer filter layout significantly improves the cleanliness of the engine oil, meeting the engine's requirement for high-cleanliness oil.

[0031] During the operation of the secondary filter assembly 3, the gap between the outer filter element 9 and the inner filter element 10, along with the design of the guide vane 12, work together to ensure the uniform distribution of engine oil throughout the filtration area. This design not only improves filtration efficiency but also extends the service life of the filter elements. Finally, the clean engine oil, after dual filtration, flows out from the oil outlet of the housing 1 and enters the engine oil supply system, providing high-quality lubrication for the engine.

[0032] After prolonged operation, if a large amount of impurities accumulates again in the settling tank 7 of the primary separation component 2, the differential pressure sensor 14 will detect the pressure change again and trigger the automatic drain device 4. The opening time and frequency of the drain valve 13 are dynamically adjusted by the control unit 15 according to the actual operating conditions, thereby realizing the automated control of the entire system. This design reduces the frequency of manual maintenance, lowers operating costs, and ensures the stable operation of the filter in highly polluted environments.

[0033] As can be seen from the above steps, this invention achieves graded filtration of engine oil through the synergistic effect of the primary separation component 2 and the secondary filtration component 3. The primary separation component 2 utilizes the swirling motion of the guide plate 5 and the centrifugal chamber 6 to pre-separate large particulate impurities; the secondary filtration component 3 further improves the cleanliness of the engine oil through a double-layer filter element layout. The introduction of the automatic draining device 4 ensures the timely discharge of impurities, preventing clogging. This design not only solves the problems of incomplete filtration and easy clogging in existing technologies, but also significantly improves the overall performance and economy of the oil filter, making it particularly suitable for high-load, high-pollution engine operating environments.

[0034] All content not described in detail in this specification is prior art known to those skilled in the art, and the model parameters of each component are not specifically limited; conventional equipment can be used. Electrical control components not mentioned in this technical solution are prior art and are therefore not shown in the figures, nor will they be described further here.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A dual-filtration oil filter, characterized in that, It includes a housing (1), a primary separation component (2), a secondary filter component (3) and an automatic drain device (4). The housing (1) is provided with a primary separation component (2) and a secondary filter component (3). The primary separation component (2) is located at the oil inlet end of the housing (1). The secondary filter component (3) is installed inside the housing (1) near the oil outlet end. The automatic drain device (4) is provided at the bottom of the housing (1).

2. The dual-filtration oil filter according to claim 1, characterized in that, The primary separation component (2) includes a guide plate (5), a centrifugal chamber (6), and a settling tank (7). The guide plate (5) is fixedly installed at the oil inlet of the housing (1). The inner surface of the guide plate (5) has a spiral structure. The outer side of the guide plate (5) is connected to the centrifugal chamber (6). The centrifugal chamber (6) has a cylindrical structure. Several radially protruding guide ribs are evenly distributed on its inner wall. The guide ribs extend along the axial direction of the inner wall of the centrifugal chamber (6). A settling tank (7) is provided at the bottom of the centrifugal chamber (6). The cross-sectional shape of the settling tank (7) is an inverted cone. A slag discharge hole (8) is provided at the center of its bottom. The slag discharge hole (8) is connected to the automatic sewage discharge device (4) through a pipe.

3. The dual-filtration oil filter according to claim 1, characterized in that, The secondary filtration assembly (3) includes an outer filter element (9), an inner filter element (10), and an isolation bracket (11). The outer filter element (9) is a cylindrical structure with a gap between its outer wall and the inner wall of the housing (1) to form an annular channel. The inner filter element (10) is coaxially installed inside the outer filter element (9), and the filtration accuracy of the inner filter element (10) is higher than that of the outer filter element (9). The isolation bracket (11) is fixedly connected between the outer filter element (9) and the inner filter element (10). Several guide vanes (12) are provided on the outer side of the isolation bracket (11), and the guide vanes (12) are evenly distributed along the axial direction of the isolation bracket (11).

4. The dual-filtration oil filter according to claim 1, characterized in that, The automatic sewage discharge device (4) includes a sewage discharge valve (13), a differential pressure sensor (14), and a control unit (15). The sewage discharge valve (13) is installed at the slag discharge hole (8) at the bottom of the housing (1). The differential pressure sensor (14) is installed at both ends of the primary separation component (2). The control unit (15) is electrically connected to the differential pressure sensor (14) and the sewage discharge valve (13).

5. A dual-filtration oil filter according to claim 2, characterized in that, The spiral angle of the spiral structure of the guide plate (5) has been optimized, and the number and height of the guide ribs in the centrifugal chamber (6) are adjusted according to the actual working conditions.

6. A dual-filtration oil filter according to claim 3, characterized in that, The outer filter element (9) and the inner filter element (10) are both made of multi-layer composite material. The isolation bracket (11) is fixedly connected to the outer filter element (9) and the inner filter element (10) by welding or snap-fitting.

7. A dual-filtration oil filter according to claim 4, characterized in that, The opening time and frequency of the drain valve (13) are dynamically adjusted by the control unit (15) according to the actual working conditions.

8. A dual-filtration oil filter according to claim 2, characterized in that, The inverted conical design of the settling tank (7) allows impurities to slide down the conical surface to the slag discharge hole (8) at the bottom center.

9. A dual-filtration oil filter according to claim 3, characterized in that, The number and angle of the guide vanes (12) are optimized to guide the flow path of the oil between the outer filter element (9) and the inner filter element (10).

10. A dual-filtration oil filter according to claim 4, characterized in that, The probe of the differential pressure sensor (14) is embedded in the inner wall of the housing (1) and in direct contact with the engine oil, while the control unit (15) is fixedly installed on the outside of the housing (1).

Images