A multi-stage filtration oil filter

Abstract

The present invention relates to the technical field of oil filters, and specifically to a multi-stage filtration oil filter, comprising an outer shell, a filter paper holder coaxially arranged in the outer shell, a coaxial sleeve on the surface of the filter paper holder being provided with a coarse filter inner sleeve, a movable sleeve on the surface of the coarse filter inner sleeve being provided with a coarse filter outer sleeve movable up and down, first filter holes for coarse filtering are distributed on the surfaces of the coarse filter inner sleeve and the coarse filter outer sleeve, the coarse filter outer sleeve is moved up and down to achieve a staggered closed state of the first filter holes on the coarse filter outer sleeve and the first filter holes on the coarse filter inner sleeve, the lower end of the outer shell having a lower opening, the lower end of the outer shell being coaxially mounted with a collecting cover, the purpose of the present invention is to solve the problem that after the bypass valve of the oil filter is opened, impurities attached to the filter paper are easily separated from the filter paper and flow through the bypass valve with the engine oil to the positions of various oil-using components of the engine.

Description

Technical Field

[0001] The invention relates to the technical field of oil filters, in particular to a multi-stage filtering oil filter. Background Art

[0002] The oil filter plays a vital role in the operation of automobile engines. During the operation of the engine, the oil circulates inside the engine and performs many important functions such as lubrication, heat dissipation, and sealing. However, various impurities such as metal chips, dust, and carbon particles are easily mixed into the oil during operation. Automobile engines usually adopt an upright axial installation layout. The filter paper is firmly connected to the oil outlet port of the oil pump through the oil pipeline to form a tight and efficient oil delivery and filtration channel. The oil filter can filter the oil and intercept these impurities to prevent them from causing wear, scratches, or blockage of the engine's pistons, crankshafts, bearings and other parts as the oil circulates in the engine. By effectively filtering impurities, the oil filter ensures the cleanliness of the oil, thereby extending the service life of the oil, and allows the engine to work under good lubrication and heat dissipation conditions, ultimately helping to extend the overall service life of the engine and ensure stable and efficient operation of the engine.

[0003] In the design structure of the existing oil filter, the bypass valve is a key component. When the filter paper of the oil filter intercepts a large amount of impurities due to long-term use, the filter channel of the filter paper is seriously blocked, and the resistance of the oil passing through the filter paper is too large. At this time, the oil cannot pass through the filter paper smoothly under normal flow pressure. In this case, the pressure generated by the oil will act on the bypass valve to open it, so that the oil bypasses the filter paper assembly and directly enters the oil system of the engine through the bypass valve to ensure that each component in the engine that needs lubrication can get timely oil supply and maintain normal operation. However, a large amount of impurities will be attached to the surface of the filter paper assembly. After the bypass valve is opened, the impurities attached to the filter paper are easy to break away from the filter paper and flow with the oil through the bypass valve to the location of each oil-using component of the engine. Once these impurity particles enter the key component area of ​​the engine, they will aggravate the wear of the internal moving parts of the engine, pose a serious threat to the performance and reliability of the engine, and greatly shorten the normal service life of the engine. Summary of the invention

[0004] The purpose of the present invention is to provide a multi-stage filtration oil filter to solve the problem that after the bypass valve of the oil filter is opened, impurities attached to the filter paper are easily separated from the filter paper and flow through the bypass valve with the oil to the positions of various oil-using components of the engine.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A multi-stage filtration oil filter comprises an outer shell, a filter paper holder is coaxially arranged in the outer shell, a coaxial sleeve of a coarse filter inner sleeve is arranged on the surface of the filter paper holder, a movable sleeve of a coarse filter outer sleeve is arranged on the surface of the coarse filter inner sleeve and a coarse filter outer sleeve is arranged which can move up and down, first filter holes for coarse filtering are distributed on the surfaces of the coarse filter inner sleeve and the coarse filter outer sleeve, and the coarse filter outer sleeve is moved up and down so that the first filter holes on the coarse filter outer sleeve and the first filter holes on the coarse filter inner sleeve are in a staggered closed state.

[0007] Preferably, the lower end of the outer shell has a lower opening, a collecting cover is coaxially installed on the lower end of the outer shell, an isolation component is installed between the inner bottom wall of the collecting cover and the lower end of the coarse filter jacket, and the surface of the isolation component is distributed with second filter holes with the same aperture as the first filter holes.

[0008] Preferably, the isolation assembly includes a guide ring, an isolation ring and an isolation sleeve. The isolation sleeve is coaxially fixedly connected to the inner bottom wall of the collection cover. The isolation ring can be moved up and down and coaxially installed on the outer surface of the isolation sleeve. The guide ring is coaxially fixedly installed between the bottom end of the coarse filter jacket and the outer surface of the isolation ring.

[0009] Preferably, a bypass valve is also included, and the bottom of the filter paper frame is coaxially fixedly connected to a truncated cone frame having an oil inlet, and the bypass valve is used to switch the oil inlet on the truncated cone frame, and the top surface of the isolation ring is fixedly connected to a linkage pressure rod, and the truncated cone frame is provided with a through hole for the linkage pressure rod to pass through, and the bypass valve can drive the linkage pressure rod to move, and the moving direction of the linkage pressure rod is opposite to the moving direction of the bypass valve.

[0010] Preferably, the top surface of the bypass valve is coaxially fixedly connected with a limit stop disk, the limit stop disk is located above the truncated cone frame, and the diameter of the limit stop disk is larger than the oil inlet aperture on the truncated cone frame, the inner wall of the filter paper frame is fixedly connected with a support frame, the bottom surface of the support frame is fixedly connected with a second support spring, and the bottom surface of the second support spring is fixedly connected to the top surface of the limit stop disk.

[0011] Preferably, a linkage push rod is fixedly connected to the upper end of the limit baffle, and a resettable linkage rotating rod is rotatably connected to the inner wall of the filter paper holder. The linkage push rod is located below one end of the linkage rotating rod, and the linkage pressure rod is located below the other end of the linkage rotating rod. The width of the linkage pressure rod is greater than the width of the linkage push rod.

[0012] Preferably, the top end of the bypass valve is fixedly connected to a limit guide rod, one side of the limit guide rod is fixedly connected to a limit stopper, and the limit stopper is located at the upper end of the linkage rotating rod.

[0013] Preferably, the inner ring surface of the isolation ring is fixedly connected with a second slider, the outer ring surface of the isolation sleeve is cooperated with to open a second slide groove for the second slider to move up and down, and a first supporting spring is fixedly connected between the second slider and the groove wall of the second slide groove.

[0014] Preferably, the inner ring surface of the coarse filter outer sleeve is fixedly connected with a first sliding block, and the outer ring surface of the coarse filter inner sleeve is cooperatively provided with a first sliding groove for the first sliding block to move up and down.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. By setting up the coarse filter structure of the coarse filter inner sleeve and the coarse filter outer sleeve, the engine oil is first coarsely filtered before entering the filter paper for fine filtration, which can effectively intercept larger impurity particles in the engine oil. This multi-stage filtration method can greatly reduce the burden of the filter paper, extend the service life of the filter paper, and improve the overall filtration effect, ensuring that the engine oil entering the engine is cleaner and reducing the wear of impurities on engine parts. When the bypass valve is opened, the coarse filter outer sleeve moves down to close the channel between the coarse filter inner sleeve and the coarse filter outer sleeve, effectively preventing the engine oil from carrying the impurities intercepted by the filter paper into the engine, protecting the engine from impurities.

[0017] 2. The linkage design integrates the opening of the bypass valve with the closing of the first filter hole on the surface of the coarse filter inner sleeve and the coarse filter outer sleeve, reducing additional control components and complex pipe connections. The entire oil filter structure is more compact and can be more reasonably arranged within the limited space of the engine compartment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the overall vertical section structure of the present invention;

[0020] Figure 3 For the present invention Figure 2 The enlarged view of point A in the middle;

[0021] Figure 4 This is a schematic diagram of the vertical section structure of the coarse filter inner sleeve of the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of the coarse filter jacket in vertical section of the present invention;

[0023] Figure 6 For the present invention Figure 5 The enlarged view of point B in the middle;

[0024] Figure 7 This is a schematic diagram of the structure of a vertical section of the isolation sleeve of the present invention;

[0025] Figure 8It is a schematic diagram of the structure of a vertical section of the support frame of the present invention;

[0026] Fig. 9 It is a structural schematic diagram of the linkage rotating rod of the present invention.

[0027] In the figure: 1. outer shell; 2. oil outlet; 3. filter paper holder; 4. check valve; 5. oil delivery port; 6. coarse filter inner sleeve; 7. first slide groove; 8. first slider; 9. coarse filter outer sleeve; 10. oil outlet; 11. guide ring; 12. isolation ring; 13. second slider; 14. second slide groove; 15. first support spring; 16. isolation sleeve; 17. collecting cover; 18. guide inclined wall; 19. linkage pressure rod; 20. through hole; 21. truncated table; 22. bypass valve; 23. limit plate; 24. linkage push rod; 25. limit guide rod; 26. reset torsion spring; 27. limit block; 28. support frame; 29. ​​second support spring; 30. linkage rotating rod; 31. support shaft. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figures 1 to 9 , the present invention provides a technical solution.

[0030] A multi-stage filtration engine oil filter comprises an outer shell 1, in which a filter paper holder 3 is coaxially arranged, a coarse filter inner sleeve 6 is coaxially sleeved on the surface of the filter paper holder 3, a coarse filter outer sleeve 9 which can be moved up and down is movably sleeved on the surface of the coarse filter inner sleeve 6, first filter holes for coarse filtering are distributed on the surfaces of the coarse filter inner sleeve 6 and the coarse filter outer sleeve 9, and the first filter holes are distributed in the same state, so that when the coarse filter inner sleeve 6 is aligned with the coarse filter outer sleeve 9, the first filter holes on the surfaces of the coarse filter inner sleeve 6 and the coarse filter outer sleeve 9 are in a connected state, and the coarse filter outer sleeve 9 is moved up and down to realize that the first filter holes on the coarse filter outer sleeve 9 and the first filter holes on the coarse filter inner sleeve 6 are in a staggered closed state, and the coarse filter outer sleeve 9 is moved downward so that the first filter holes on the surfaces of the coarse filter inner sleeve 6 and the coarse filter outer sleeve 9 are staggered with each other, and the channel communicating between the coarse filter inner sleeve 6 and the coarse filter outer sleeve 9 is closed, so that the engine oil cannot pass through, so that after the bypass valve 22 is opened, the engine oil cannot take away the impurities attached to the filter paper.

[0031] By setting the coarse filter inner sleeve 6 and the coarse filter outer sleeve 9, when they are aligned, the first filter hole is connected, and the engine oil first passes through the first filter holes on the surface of the coarse filter inner sleeve 6 and the coarse filter outer sleeve 9 for coarse filtration to filter out larger impurity particles in the engine oil, such as larger solid particles such as metal chips and dust, and then is finely filtered through the filter paper. Secondly, by moving the coarse filter outer sleeve 9 downward to close the channel between the coarse filter inner sleeve 6 and the coarse filter outer sleeve 9, the engine oil cannot pass through, and the impurities that have been intercepted on the filter paper cannot pass through either, which can prevent the engine oil from entering the engine with impurities when the bypass valve 22 is opened, thereby better protecting the engine from being invaded by impurities.

[0032] Please refer to Figure 2 The lower end of the shell 1 has a lower opening, and a collecting cover 17 is coaxially installed at the lower end of the shell 1. An isolation component is installed between the inner bottom wall of the collecting cover 17 and the lower end of the coarse filter jacket 9. The surface of the isolation component is distributed with second filter holes with the same aperture as the first filter holes. Through such an arrangement, impurities coarsely filtered out are prevented from entering the area below the bypass valve 22.

[0033] The isolation assembly includes a guide ring 11, an isolation ring 12 and an isolation sleeve 16. The isolation sleeve 16 is coaxially fixedly connected to the inner bottom wall of the collecting cover 17. The isolation ring 12 can be moved up and down and coaxially installed on the outer surface of the isolation sleeve 16. The guide ring 11 is coaxially fixedly installed between the bottom end of the coarse filter jacket 9 and the outer surface of the isolation ring 12. The isolation ring 12 moves downward to drive the guide ring 11 to move downward, and the guide ring 11 moves downward to drive the coarse filter jacket 9 to move downward until the side surface of the guide ring 11 is connected to the internal base of the outer shell 1. At this time, the first filter hole on the coarse filter jacket 9 and the first filter hole on the coarse filter inner sleeve 6 are also in a staggered closed state.

[0034] The inner bottom wall of the collecting hood 17 is arranged as a flow guiding inclined wall 18 , which is helpful to guide the impurities to move toward the inner wall of the collecting hood 17 .

[0035] As needed, an oil through port 10 is opened at the bottom of the coarse filter outer sleeve 9. After the coarse filter outer sleeve 9 moves downward, the oil through port 10 is no longer blocked by the coarse filter inner sleeve 6, allowing the engine oil to pass through. If the space between the coarse filter outer sleeve 9 and the outer shell 1 can be designed to be large enough for a large amount of filtered impurities, it is also possible to choose not to open the oil through port 10.

[0036] When filtering out larger impurity particles during coarse filtration, the impurities are located between the outer side of the coarse filter jacket 9 and the inner side of the housing 1. When the engine oil encounters greater resistance when passing through the filter paper, the effective channels available for the engine oil to pass through are reduced. According to the principles of fluid mechanics, when the inlet pressure of the filter is relatively stable, the narrowing of the channel will increase the flow resistance of the engine oil, thereby reducing the flow rate of the engine oil. Since the engine oil encounters greater resistance when passing through the filter paper, the pressure inside the filter will gradually increase. In this case, the pressure difference at both ends of the bypass valve 22 increases. When the pressure difference reaches the opening of the bypass valve 22, the bypass valve 22 will be opened. When the pressure is turned on, the bypass valve 22 will open, allowing some unfiltered oil to pass directly. Before the bypass valve 22 is opened, the flow rate will continue to decrease and the pressure will continue to accumulate. When the oil flow rate decreases, the force of the oil on the impurities decreases. The acceleration of the impurities under the action of gravity will cause the impurities to have a tendency to move downward, causing the impurities to gradually pass through the lower opening of the outer shell 1 and fall into the collection cover 17 for accumulation; and, in the process of continuous filtering, the number of impurities intercepted will increase, and a large amount of impurities will have a more obvious tendency to fall due to the combined effect of the reduced oil flow rate and their own gravity.

[0037] When impurities accumulate in the collecting cover 17, the side surface of the guide ring 11 is connected to the inner base of the shell 1, which will seal the impurities in the space surrounded by the isolation component and the collecting cover 17, which is helpful to prevent these impurities from flowing away with the oil after the bypass valve 22 is opened.

[0038] It also includes a bypass valve 22. The bottom of the filter paper holder 3 is coaxially fixedly connected to a truncated frame 21 with an oil inlet. The bypass valve 22 is used to switch the oil inlet on the truncated frame 21. The top surface of the isolation ring 12 is fixedly connected to a linkage pressure rod 19. The truncated frame 21 is provided with a through hole 20 for the linkage pressure rod 19 to pass through. The bypass valve 22 can drive the linkage pressure rod 19 to move, and the moving direction of the linkage pressure rod 19 is opposite to the moving direction of the bypass valve 22. When the pressure difference at both ends of the bypass valve 22 reaches the opening of the bypass valve 22, the bypass valve 22 is opened. When pressure is applied, the bypass valve 22 will move upward to open the oil inlet on the truncated table frame 21. At this time, the bypass valve 22 will drive the linkage pressure rod 19 to move downward. The downward movement of the linkage pressure rod 19 will drive the isolation ring 12 to move downward. The downward movement of the isolation ring 12 will drive the guide ring 11 to move downward, and drive the coarse filter inner sleeve 6 to move downward until the side surface of the guide ring 11 is connected to the internal base of the outer shell 1, so that the bypass valve 22 is opened and the first filter holes on the surfaces of the coarse filter inner sleeve 6 and the coarse filter outer sleeve 9 are staggered and closed.

[0039] Through the linkage design, the opening of the bypass valve 22 and the closing operation of the first filter hole are integrated together, reducing additional control components and complex pipeline connections, which makes the structure of the entire oil filter more compact.

[0040] The top surface of the bypass valve 22 is coaxially fixedly connected with a limit stop disk 23, which is located above the truncated cone frame 21, and the diameter of the limit stop disk 23 is larger than the oil inlet aperture on the truncated cone frame 21. By setting the limit stop disk 23, the bypass valve 22 is prevented from passing downward through the oil inlet of the truncated cone frame 21. The inner wall of the filter paper frame 3 is fixedly connected with a support frame 28, and the bottom surface of the support frame 28 is fixedly connected with a second support spring 29. The bottom surface of the second support spring 29 is fixedly connected to the top surface of the limit stop disk 23. When the bypass valve 22 moves upward, the second support spring 29 will be compressed. After the pressure on the outside of the bypass valve 22 is reduced, it can automatically reset under the elastic force of the second support spring 29.

[0041] The upper end of the limit stopper 23 is fixedly connected to a linkage push rod 24, and the inner wall of the filter paper holder 3 is rotatably connected to a resettable linkage rotating rod 30. The linkage push rod 24 is located below one end of the linkage rotating rod 30, and the linkage pressure rod 19 is located below the other end of the linkage rotating rod 30. When the bypass valve 22 moves upward, the linkage push rod 24 is driven to move upward. The linkage push rod 24 moves upward to lift one end of the linkage rotating rod 30, so that the linkage rotating rod 30 rotates and tilts, and the other end moves downward, thereby pushing the linkage pressure rod 19 to move downward. The width of the linkage pressure rod 19 is greater than the width of the linkage push rod 24, ensuring that the linkage push rod 24 moves upward. When its top end passes over the linkage rotating rod 30, the other end of the linkage rotating rod 30 also contacts the linkage pressure rod 19, limiting the linkage pressure rod 19 from moving back. This is also the maximum angle at which the linkage rotating rod 30 can rotate.

[0042] A support shaft 31 is fixedly connected to the inner wall of the filter paper holder 3, and the support shaft 31 is rotatably connected to the linkage rotating rod 30. The support shaft 31 is located on a side close to the linkage pressure rod 19, and a reset torsion spring 26 is fixedly connected between the linkage rotating rod 30 and the inner wall of the filter paper holder 3 to ensure that the linkage rotating rod 30 can be reset.

[0043] The top of the bypass valve 22 is fixedly connected to the limit guide rod 25, and one side of the limit guide rod 25 is fixedly connected to the limit stopper 27. The limit stopper 27 is located at the upper end of the linkage rotating rod 30. By setting the limit stopper 27, when the bypass valve 22 is not opened, the linkage rotating rod 30 is prevented from rotating due to the flow of oil, causing the linkage pressure rod 19 to move downward, so that the first filter hole becomes smaller or closed. In order to ensure that the upward movement of the linkage push rod 24 can make the linkage rotating rod 30 rotate and tilt, a conventional setting is performed, and the linkage push rod 24 and the linkage The lower end of the rotating rod 30 has a certain distance, so that the bypass valve 22 moves upward to drive the limit guide rod 25 and the limit block 27 to move upward a certain distance before the linkage push rod 24 contacts the linkage rotating rod 30, thereby preventing the limit block 27 and the linkage push rod 24 from being stuck up and down with the linkage rotating rod 30. According to needs, the length of the oil port of the round table frame 21 extending below the bypass valve 22 is greater than the distance between the linkage push rod 24 and the lower end of the linkage rotating rod 30, thereby ensuring that after the bypass valve 22 is opened, the first filter hole has been dislocated and become smaller or closed.

[0044] The linkage push rod 24 movably penetrates the surface of the support frame 28 . By setting the limiting guide rod 25 to penetrate the support frame 28 , it is helpful to limit the moving track of the limiting guide rod 25 .

[0045] The inner ring surface of the isolation ring 12 is fixedly connected with the second slider 13, and the outer ring surface of the isolation sleeve 16 is provided with a second slide groove 14 for the second slider 13 to move up and down. The first support spring 15 is fixedly connected between the second slider 13 and the groove wall of the second slide groove 14, and the first support spring 15 is provided to provide elastic support for the isolation component.

[0046] The inner ring surface of the coarse filter outer sleeve 9 is fixedly connected with a first slider 8, and the outer ring surface of the coarse filter inner sleeve 6 is provided with a first slide groove 7 for the first slider 8 to move up and down. An elastic supporting element can also be arranged between the first slider 8 and the groove wall of the first slide groove 7 as needed.

[0047] An oil outlet 2 is provided on the upper end surface of the housing 1, and the oil outlet 2 is communicated with the upper end of the filter paper holder 3. An oil delivery port 5 is provided on the upper end surface of the housing 1. A check valve 4 is installed at the oil delivery port 5 inside the housing 1. The check valve 4 is used to prevent oil reflux. The oil enters the housing 1 from the oil delivery port 5, passes through the first filter holes of the coarse filter inner sleeve 6 and the coarse filter outer sleeve 9, passes through the filter paper between the filter paper holder 3 and the coarse filter inner sleeve 6, enters the interior of the filter paper holder 3, and then flows out of the housing 1 from the oil outlet 2.

[0048] This scheme is specifically as follows: Normal filtering process: the engine oil enters the interior of the outer shell 1 from the oil delivery port 5 at the upper end of the outer shell 1. At this time, the coarse filter inner sleeve 6 and the first filter holes on the surface of the coarse filter outer sleeve 9 are in a connected state. The engine oil passes through the first filter holes on the surface of the coarse filter inner sleeve 6 and the coarse filter outer sleeve 9 for coarse filtering to filter out larger impurity particles in the engine oil. The coarsely filtered engine oil is then finely filtered through the filter paper between the filter paper holder 3 and the coarse filter inner sleeve 6. The finely filtered engine oil enters the interior of the filter paper holder 3 and finally flows out from the oil outlet 2 at the upper end of the outer shell 1 to enter the engine to participate in the lubrication cycle.

[0049] Pressure accumulation before the bypass valve 22 is opened: As the oil is continuously filtered, the filter paper is gradually clogged by impurities, and the effective channel for the oil to pass through is reduced. The narrowing of the channel increases the flow resistance of the oil, thereby reducing the flow rate of the oil. Since the oil encounters greater resistance when passing through the filter paper, the pressure inside the housing 1 will gradually increase, and the pressure difference at both ends of the bypass valve 22 will also increase accordingly.

[0050] The bypass valve 22 is opened: when the pressure difference at both ends of the bypass valve 22 reaches the opening pressure of the bypass valve 22, the bypass valve 22 will move upward to open the oil inlet on the round table frame 21. At the same time, the limit guide rod 25 at the top of the bypass valve 22 moves upward accordingly. The movement of the limit guide rod 25 drives the limit block 27 to move. After the bypass valve 22 moves upward to drive the limit guide rod 25 and the limit block 27 to move upward a certain distance, the linkage push rod 24 will contact the linkage rotating rod 30. Subsequently, the linkage push rod 24 moves upward to lift one end of the linkage rotating rod 30, so that the linkage rotating rod 30 tilts. At this time, the linkage rotating rod 30 The other end will move downward, because the linkage pressure rod 19 is located below the other end of the linkage rotating rod 30, the inclination of the linkage rotating rod 30 will push the linkage pressure rod 19 to move downward, and the downward movement of the linkage pressure rod 19 will drive the isolation ring 12 to move downward, and the downward movement of the isolation ring 12 will drive the guide ring 11 to move downward, and then drive the coarse filter inner sleeve 6 to move downward, so that the first filter holes on the surfaces of the coarse filter inner sleeve 6 and the coarse filter outer sleeve 9 are misaligned until the side surface of the guide ring 11 is connected to the internal base of the outer shell 1, so that the bypass valve 22 is opened while driving the first filter holes on the surfaces of the coarse filter inner sleeve 6 and the coarse filter outer sleeve 9 to be staggered and closed.

[0051] Component reset: When the working condition of the filter returns to normal, that is, the blockage of the filter paper is alleviated, and the oil pressure and flow rate return to normal, the pressure on the outside of the bypass valve 22 decreases, and the bypass valve 22 will automatically reset under the elastic force of the second support spring 29, driving the relevant components back to the initial position, and the linkage rotating rod 30 automatically resets under the elastic force of the reset torsion spring 26, and the isolation ring 12, the guide ring 11, and the coarse filter jacket 9 automatically reset under the elastic force of the first support spring 15, and the coarse filter inner sleeve 6 is reconnected with the filter holes on the surface of the coarse filter jacket 9, and the outer shell 1 returns to the normal multi-stage filtration working mode.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage filtration oil filter, comprising a housing (1), characterized in that: A filter paper holder (3) is coaxially arranged in the housing (1); a coaxial sleeve of a coarse filter inner sleeve (6) is provided on the surface of the filter paper holder (3); a coarse filter outer sleeve (9) movable on the surface of the coarse filter inner sleeve (6) is provided; first filter holes for coarse filtering are distributed on the surfaces of the coarse filter inner sleeve (6) and the coarse filter outer sleeve (9); the coarse filter outer sleeve (9) is moved up and down to achieve a staggered closed state in which the first filter holes on the coarse filter outer sleeve (9) and the first filter holes on the coarse filter inner sleeve (6); The lower end of the housing (1) has a lower opening, a collecting cover (17) is coaxially mounted on the lower end of the housing (1), an isolation component is mounted between the inner bottom wall of the collecting cover (17) and the lower end of the coarse filter jacket (9), and a second filter hole having an aperture equal to that of the first filter hole is distributed on the surface of the isolation component; The isolation assembly comprises a guide ring (11), an isolation ring (12) and an isolation sleeve (16); the isolation sleeve (16) is coaxially fixedly connected to the inner bottom wall of the collection cover (17); the isolation ring (12) is coaxially mounted on the outer surface of the isolation sleeve (16) so as to be movable up and down; and the guide ring (11) is coaxially fixedly mounted between the bottom end of the coarse filter jacket (9) and the outer surface of the isolation ring (12); It also includes a bypass valve (22). The bottom of the filter paper holder (3) is coaxially fixedly connected to a truncated frame (21) having an oil inlet. The bypass valve (22) is used to open and close the oil inlet on the truncated frame (21). The top surface of the isolation ring (12) is fixedly connected to a linkage pressure rod (19). The truncated frame (21) is provided with a through hole (20) for the linkage pressure rod (19) to pass through. The bypass valve (22) can drive the linkage pressure rod (19) to move, and the movement direction of the linkage pressure rod (19) is opposite to the movement direction of the bypass valve (22).

2. The multi-stage filtration oil filter according to claim 1, characterized in that: The top surface of the bypass valve (22) is coaxially fixedly connected to a limit stop disk (23), the limit stop disk (23) is located above the truncated cone frame (21), and the diameter of the limit stop disk (23) is larger than the diameter of the oil inlet on the truncated cone frame (21), the inner wall of the filter paper frame (3) is fixedly connected to a support frame (28), the bottom surface of the support frame (28) is fixedly connected to a second support spring (29), and the bottom surface of the second support spring (29) is fixedly connected to the top surface of the limit stop disk (23).

3. The multi-stage filtration oil filter according to claim 2, characterized in that: The upper end of the limit stop plate (23) is fixedly connected to a linkage push rod (24); the inner wall of the filter paper holder (3) is rotatably connected to a resettable linkage rotating rod (30); the linkage push rod (24) is located below one end of the linkage rotating rod (30); the linkage pressure rod (19) is located below the other end of the linkage rotating rod (30); and the width of the linkage pressure rod (19) is greater than the width of the linkage push rod (24).

4. The multi-stage filtration oil filter according to claim 3, characterized in that: The top end of the bypass valve (22) is fixedly connected to a limit guide rod (25), one side of the limit guide rod (25) is fixedly connected to a limit stopper (27), and the limit stopper (27) is located at the upper end of the linkage rotating rod (30).

5. The multi-stage filtration oil filter according to claim 1, characterized in that: A second slider (13) is fixedly connected to the inner ring surface of the isolation ring (12), and a second slide groove (14) is formed on the outer ring surface of the isolation sleeve (16) for the second slider (13) to move up and down. A first support spring (15) is fixedly connected between the second slider (13) and the groove wall of the second slide groove (14).

6. The multi-stage filtration oil filter according to claim 1, characterized in that: The inner ring surface of the coarse filter outer sleeve (9) is fixedly connected to a first sliding block (8), and the outer ring surface of the coarse filter inner sleeve (6) is provided with a first sliding groove (7) for the first sliding block (8) to move up and down.

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