CN110630350B

CN110630350B - Oil filter for engine

Info

Publication number: CN110630350B
Application number: CN201911041229.9A
Authority: CN
Inventors: 张国辉; 徐振强; 徐瑗徽
Original assignee: Individual
Current assignee: Hangzhou Zicheng Biotechnology Co ltd
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2021-11-23
Anticipated expiration: 2039-10-30
Also published as: CN110630350A

Abstract

The invention discloses an engine oil filter, which comprises a filter shell, a filter element arranged in the filter shell and a cover body matched with the filter shell, wherein the shell and the cover body are provided with a first fastening cover and a second fastening cover; through the setting of above-mentioned structure for when the filter takes out, fluid in the filter can't flow backwards out, can not influence the normal business turn over of fluid simultaneously, has guaranteed the normal work of filter, and practicality very is reliable.

Description

Oil filter for engine

Technical Field

The invention belongs to the technical field of engine accessories, and particularly relates to an oil filter for an engine.

Background

The oil filter is the filtration of the media in the load lubrication system. In the working process of the engine, metal abrasive dust, carbon deposit oxidized at high temperature, colloidal precipitate, water and the like are continuously mixed into the lubricating oil; the engine oil filter is positioned in an engine lubricating system, an engine oil pump is arranged at the upstream of the engine oil filter, and each part needing to be lubricated in the engine is arranged at the downstream of the engine oil filter, and the engine oil filter is used for filtering mechanical impurities and colloid in the engine oil, keeping the cleanness of the lubricating oil and prolonging the use of the parts.

The prior publication No. CN203347882U discloses an oil filter, which is very convenient to detach and install a filter element, but because the top of the housing of the oil filter is very smooth, only a circle of concave surfaces are arranged around the housing, a special tool matched with the concave surfaces must be used when the oil filter is installed or detached, and the special tool is not commonly used in daily life, but when the oil filter needs to be replaced, the special tool does not have a place to find, which is very inconvenient and troublesome.

The existing device is used for the filter can be connected with an engine through a specific connection mode among all parts, the filter and the disassembly of the filter are not influenced, the filter can be reduced to occupy the surrounding space, the attractiveness is improved, meanwhile, the filter element can be prevented from shaking due to vibration, the aggravation loss of the filter element is caused, and the service life of the filter element is prolonged.

However, after the engine is separated, when the filter is taken out, because the filter is in an inclined state and is arranged in an inverted mode, the oil inlet and the oil outlet are located below the filter, when the filter is taken out, oil in the filter easily and naturally flows out, and the flowing oil is difficult to clean.

Disclosure of Invention

The invention provides an engine oil filter capable of preventing oil from flowing back to overcome the defects of the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme: an engine oil filter for an engine comprises a filter shell, a filter element arranged in the filter shell and a cover body matched with the filter shell, wherein a first fastening cover and a second fastening cover are arranged on the shell and the cover body; through the setting of above-mentioned structure for when the filter takes out, fluid in the filter can't flow backwards out, can not influence the normal business turn over of fluid simultaneously, has guaranteed the normal work of filter, and practicality very is reliable.

The first backflow preventing assembly comprises a first sealing piece for controlling the opening and closing of the second oil outlet pipe and a first oil passing plate matched with the first sealing piece, and a first support column is fixedly arranged on the first sealing piece; through the setting of above-mentioned structure for above-mentioned second goes out oil pipe and can realize the control of opening and close to second play oil pipe through first closure piece, avoids the refluence of fluid, and can guarantee that the fluid after filtering normally flows out.

The second oil outlet pipe is provided with a first support frame for assisting the first support column to move, the first support frame is fixedly provided with a first telescopic spring connected with the first sealing element, and the first support frame is arranged below the first sealing element; through the arrangement of the structure, the first closing piece can move in a telescopic mode through the first telescopic spring, so that the opening and closing of the second oil outlet pipe can be controlled as required.

The second backflow preventing assembly comprises a second sealing piece for controlling the opening and closing of a second oil inlet pipe and a second oil through plate matched with the second sealing piece, and a second supporting column is fixedly arranged on the second sealing piece; through the setting of above-mentioned structure for above-mentioned second advances oil pipe and can realize advancing the open and close control of oil pipe to the second through the second closure spare, avoids the refluence of fluid, and can guarantee the normal entering of unfiltered fluid.

A second support frame for assisting a second support column to move is arranged on the second oil inlet pipe, a second telescopic spring connected with a second closing piece is fixedly arranged on the first support frame, and the second support frame is arranged above the second closing piece; through the arrangement of the structure, the second sealing part can be moved in a telescopic mode through the second telescopic spring, so that the opening and closing of the second oil inlet pipe can be controlled as required.

The first fastening cover and the second fastening cover are respectively provided with a third sealing strip and a fourth sealing strip, the first fastening cover is provided with a first locking strip for locking the first fastening cover and the second fastening cover and a first accommodating groove for accommodating the first locking strip, the second fastening cover is provided with a second locking strip and a second accommodating groove, the second accommodating groove is provided with a movable locking rod, the second fastening cover is provided with a third accommodating groove for the movement of the locking rod, and the third accommodating groove is provided with a third elastic part connected with the locking rod; through the arrangement of the structure, the third sealing strip and the fourth sealing strip can increase the connection elasticity between the first fastening cover and the second fastening cover when the first fastening cover and the second fastening cover are connected and fastened, the first fastening cover and the second fastening cover are prevented from being connected and too tightly or too loosely, the component loss is aggravated, the third elastic piece and the locking rod are arranged in a matched mode, so that the first locking strip and the second locking strip are controlled, and the first fastening cover and the second fastening cover are fixed and loosened at any time.

The first accommodating groove is provided with a rotatable connecting strip, the connecting strip is movably connected with the first locking strip and the second locking strip respectively, and the first locking strip and the second locking strip are provided with a first connecting block, a second connecting block, a third moving groove and a fourth moving groove which are used for moving the first connecting block and the second connecting block; through the setting of above-mentioned structure for above-mentioned first locking strip and second locking strip can be fixed to the buckle of first fastening cover and second fastening cover through the connecting strip realization, and can realize the effect of locking with the check lock lever cooperation, and the setting of first connecting block and second connecting block, so that fix first locking strip and second locking strip, avoid first locking strip and second locking strip pine to take off.

The invention has the following advantages: this oil cleaner for engine passes through the setting of above-mentioned structure for this filter when with the engine separation, remaining fluid can not flow backwards out in the filter, guarantees the cleanliness factor, avoids the trouble of clearance, can not influence the normal filtration process of fluid simultaneously, very reliable and stable.

Drawings

Fig. 1 is a perspective view of the present invention.

Fig. 2 is a perspective exploded view of fig. 1.

Fig. 3 is a perspective sectional view of fig. 2.

Fig. 4 is an enlarged view of a structure at a in fig. 3.

Fig. 5 is an enlarged view of a structure at B in fig. 3.

Fig. 6 is an enlarged view of a structure at C in fig. 3.

Fig. 7 is an enlarged view of the structure at D in fig. 3.

Fig. 8 is a perspective sectional view of fig. 1.

Fig. 9 is an enlarged view of a structure at E in fig. 8.

Fig. 10 is an enlarged view of the structure at F in fig. 8.

Fig. 11 is a perspective sectional view of the second fastening cover and the second connection filter holder of fig. 1 engaged.

Fig. 12 is an enlarged view of the structure at G in fig. 11.

Fig. 13 is a perspective cross-sectional view of the second flowline of fig. 1.

Fig. 14 is a perspective sectional view of the second oil inlet pipe in fig. 1.

Detailed Description

As shown in fig. 1-14, an oil filter for an engine includes a filter housing 1, a filter element 2 disposed in the filter housing 1, and a cover 3 engaged with the filter housing 1, wherein a central tube 21 is disposed in the middle of the filter element 2, an upper filter element cover 22 and a lower filter element cover 23 are respectively disposed at the top and the bottom of the filter element 2, the filter element 2 and the filter housing 1 are detachably connected, the filter housing 1 and the cover 3 are detachably connected, a first fastening cover 41 and a second fastening cover 42 are disposed on the housing 1 and the cover 3, the first fastening cover 41 and the second fastening cover 42 can be combined with each other, and through the arrangement of the above structure, the oil filter can realize a fastening effect through the cooperation of the first fastening cover and the second fastening cover, so as to be directly fixed on the engine through bolts to communicate with the engine, avoided specialized tool's use, make the dismantlement installation of filter more simple and convenient, and cooperation between filter and the lid, make the connection structure between filter and the lid simpler, reduce the trouble of dismouting, above-mentioned filter casing, the filter core, the lid, the center tube, go up filter core lid and lower filter core lid and be existing product on the existing market, for prior art, no longer describe here, above-mentioned first fastening cover and second fastening cover all adopt metal material to make, above-mentioned first fastening cover and second fastening cover merge each other and cover and locate on filter casing and the lid

The filter element comprises an upper filter element cover 22, a lower filter element cover 23, a first clamping block 221 and a second clamping block 231, wherein the two sides of the upper filter element cover 22 and the lower filter element cover 23 are respectively provided with the first clamping block 221 and the second clamping block 231, the first clamping block 221 and the second clamping block 231 are respectively provided with a first telescopic block 222 and a second telescopic block 232 which can move, and a first telescopic groove 223 and a second telescopic groove 233 which are used for accommodating the first telescopic block 222 and the second telescopic block 232, the first telescopic groove 223 and the second telescopic groove 233 are respectively provided with a first elastic piece 224 and a second elastic piece 234 which are fixedly connected with the first telescopic block 222 and the second telescopic block 232, through the arrangement of the structure, the filter element can be arranged in the filter element shell through the upper filter element cover and the lower filter element cover, and the arrangement of the first clamping block and the second clamping block plays a certain fixing role on the filter element, the filter element is prevented from shaking, and the arrangement of the first telescopic block and the second telescopic block can reduce the shaking of the filter element when the filter element shakes, the shock absorption effect is achieved, the loss of the filter element is reduced, the service life of the filter element is prolonged, and the replacement cost is reduced; the filter comprises a filter shell 1, a first movable groove 11 and a second movable groove 12 which are used for respectively providing vertical movement for a first telescopic block 222 and a second telescopic block 232 are arranged on the filter shell 1, a first thread groove 13 is arranged on the inner wall of the filter shell 1, an external thread pipe 31 matched with the first thread groove 13 is arranged on a cover body 3, a plurality of sealing grooves 14 are arranged at the opening of the filter shell 1, a first sealing strip 141 is arranged on the sealing groove 14, a plurality of sealing convex parts 32 matched with the sealing grooves 14 are arranged on the cover body 3, and by the arrangement of the structure, the filter element can realize fixing and limiting effects through the first movable groove and the second movable groove, so that the filter element is prevented from easily shaking in the filter, the stability of the filter is ensured, and the contact area between the filter shell and the cover body is increased due to the matching of the sealing grooves and the sealing convex parts, make between filter casing and the lid inseparabler of contact, avoid the seepage of fluid, and the setting of first sealing strip can strengthen the leakproofness between lid and the filter casing.

In this embodiment, the first elastic element, the second elastic element, the third elastic element and the fourth elastic element are all provided with coil springs, which are the prior art and are not described herein again, the first sealing strip is made of rubber material, the bottom of the lower filter element cover is provided with a plurality of arc-shaped metal elastic pieces, and the arc-shaped metal elastic pieces are fixed on the lower filter element cover through two fixing blocks; when the cover body is installed, the external threaded pipe on the cover body is sleeved on the first threaded groove, then the cover body is rotated, so that the cover body moves downwards along the first threaded groove until the cover body cannot rotate, and the cover body is installed; when the filter casing vibrations, can drive the filter core vibrations, the filter core through first flexible piece and the flexible piece of second respectively with the cooperation of first elastic component and second elastic component, realize elastic buffer's effect, and the arc metal shrapnel of bottom also deforms along with the vibrations of filter core to play the effect of buffering.

The upper filter element cover 22 is provided with a first oil outlet pipe 225 communicated with the central pipe 21 and an oil passing disc 24 used for reducing the impact force of oil, the first oil outlet pipe 225 is provided with a first internal thread groove 226 and an external thread groove 227, the middle part of the oil passing disc 24 is provided with an internal thread pipe 241 matched with the external thread groove 227, the cover body 3 is provided with a fixed pipe 33 contacted with the oil passing disc 24, the bottom of the fixed pipe 33 is provided with a cushion block 331, through the arrangement of the structure, the oil conveyed in can be buffered through the oil passing disc, the impact force of the oil on the filter element is slowed down, the impact force of the oil on the filter element is avoided from causing certain damage, meanwhile, the filtering effect on the oil is ensured, and the arrangement of the fixed pipe plays a fixed effect on the oil passing disc, the oil passing disc is prevented from shaking in the filter shell, the stability of the oil passing disc is ensured, and the cushion block is arranged, the extrusion force of the fixed pipe on the oil passing disc can be reduced, and the filter element is prevented from being extruded and damaged due to overlarge pressure; when the oil passing disc is installed, the internal thread pipe is directly sleeved on the external thread groove, the oil passing disc is rotated and moves downwards along the threads, so that the oil passing disc is fixed, the cushion blocks are made of rubber materials, the oil passing disc is fixed above the upper filter element cover, and when the cover body is fixed, the fixed pipe on the cover body supports the upper surface of the oil passing disc.

The oil pan 24 is provided with a branch chamber 242 for branch delivery of oil and a first oil inlet pipe 243 for feeding oil into the branch chamber 242, a second internal thread groove 244 is arranged on the inner wall of the first oil inlet pipe 243, an oil outlet 245 communicated with the filter element 2 is arranged at the bottom of the diversion cavity 242, the diameter of the upper opening of the oil outlet hole 245 is smaller than that of the lower opening of the oil outlet hole 245, and by the arrangement of the above structure, so that the oil can be directly introduced into the shunting cavity for shunting transportation to reduce the impact force when the oil is just transported in, the oil outlet is arranged, so that the oil can be conveyed to the filter element through the oil outlet in a shunting cavity in a shunting way, the flow area of the oil is increased, the oil liquid flows to the filter element more uniformly for filtering, and the diameter of the oil outlet hole is set, so that the capability of reducing the impact force of the oil liquid can be enhanced; oil liquid enters the second oil inlet pipe through the oil inlet, then enters the first oil inlet pipe through the second oil inlet pipe, finally enters the shunting cavity, flows out of the oil outlet hole, and finally enters the filter element for filtering.

The cover body 3 is provided with a first oil inlet 34 communicated with the internal thread pipe 241 and an oil outlet 35 communicated with the first oil inlet pipe 243, the internal thread pipe 241 is provided with a second oil outlet pipe 25 in threaded fit with the internal thread pipe 241, the first oil inlet pipe 243 is provided with a second oil inlet pipe 26 in threaded fit with the first oil inlet pipe 243, the second oil outlet pipe 25 and the second oil inlet pipe 26 are both provided with a stop block 27, through the arrangement of the structure, the second oil outlet pipe and the second oil inlet pipe can increase the fixing effect on the cover body and the filter, the looseness of the cover body and the filter due to vibration is avoided, and the arrangement of the stop block can strengthen the connection strength between the cover body and the filter and improve the stability and reliability of the structure; the oil outlet pipe and the oil inlet pipe are fixed on the first oil outlet pipe and the first oil inlet pipe through thread fit, when the oil outlet pipe and the second oil inlet pipe are fixed, the stop block is fixed on the upper surface of the cover body, after the cover body is installed, the oil outlet pipe and the second oil inlet pipe are inserted into the oil outlet and the second oil inlet, and then the oil outlet pipe and the second oil inlet pipe are fixed on the first oil outlet pipe and the first oil inlet pipe.

The first fastening cover 41 and the second fastening cover 42 are respectively provided with a first connecting filter base 43 and a second connecting filter base 44 for fixing the oil filter on the engine, the first connecting filter base 43 is provided with a second oil inlet 431 communicated with the second oil inlet pipe 26 and a first semicircular oil outlet 432 communicated with the second oil outlet pipe 25, the second connecting filter base 44 is provided with a second semicircular oil outlet 441 communicated with the second oil outlet pipe 25, the second connecting filter base 44 is provided with a second sealing strip 442, through the arrangement of the structure, the first fastening cover and the second fastening cover can be connected and fixed with the engine through the first connecting filter base and the second connecting filter base so as to be convenient for mounting and dismounting the oil filter, and the first semicircular oil outlet and the second semicircular oil outlet can ensure the smoothness with the engine, the second sealing strips are arranged, so that the sealing performance between the first fastening cover and the second fastening cover can be enhanced, and the oil leakage phenomenon of the first semicircular oil outlet and the second semicircular oil outlet is avoided; the second sealing strip is made of rubber materials, the horizontal position of the bottom end of the second sealing strip is lower than the horizontal position of the top end of the second oil outlet pipe, a plurality of bolt holes are formed in the edges of the first connecting filter base and the second connecting filter base and matched with the bolt holes in the engine and fixed through bolts, and the first semicircular oil outlet and the second semicircular oil outlet are combined with each other to form a complete oil outlet so as to convey oil.

The second fastening cover 42 is respectively provided with a third sealing strip 411 and a fourth sealing strip 421, the first fastening cover 41 is provided with a first locking strip 433 and a second locking strip 443 for locking the first fastening cover 41 and the second fastening cover 42 and a first accommodating groove 434 for accommodating the first locking strip 433 and the second locking strip 434, two ends of the first accommodating groove are respectively provided with a rotatable connecting strip 435, and the connecting strips 435 at two ends are respectively rotatably connected with the first locking strip 433 and the second locking strip 443; two ends of the second fastening cover 42 are respectively provided with a second accommodating groove 444, the second accommodating groove 444 is provided with a movable locking rod 445, the second fastening cover 42 is provided with a third accommodating groove 446 for the locking rod 445 to move, the third accommodating groove 446 is provided with a third elastic part 447 connected with the locking rod 445, and the locking rod 445 is matched with the first locking strip 433 and the second locking strip 443 to lock the first fastening cover 41 and the second fastening cover 42; be equipped with first connecting block 436 and second connecting block 448 and be used for supplying third shifting chute 437 and fourth shifting chute 449 that first connecting block 436 and second connecting block 448 removed on first locking strip 433 and the second locking strip 443 respectively, setting through above-mentioned structure, make above-mentioned first locking strip and second locking strip can realize through the connecting strip that the buckle to first fastening cover and second fastening cover is fixed, and can realize the effect of locking with the fitting bar cooperation, and the setting of first connecting block and second connecting block, so that fix first locking strip and second locking strip, avoid first locking strip and second locking strip to take off and take off.

Above-mentioned third sealing strip and fourth sealing strip all adopt rubber materials to make, when fixed first fastening cover and second fastening cover, stir the check lock lever down earlier, make the check lock lever shrink to in the third holding tank, then rotate the connecting strip, rotate the connecting strip to the inboard of check lock lever, first check lock strip and second check lock strip then rotate to the outside of check lock lever, then, continue first check lock strip and second check lock strip of upset, make first check lock strip and second check lock strip overturn respectively to in first holding tank and the second holding tank, first connecting block and second connecting block contact each other this moment, thereby it is together fixed with first fastening cover and second fastening cover, when rotating first check lock strip and second check lock strip, must rotate a check lock strip to the back in the holding tank, rotate another check lock strip to in the holding tank again.

The third moving groove 437 and the fourth moving groove 449 are both provided with a fourth elastic part 438 connected with the first connecting block 436 and the second connecting block 448, the first connecting block 436 is provided with a first magnetic part 4361, the second connecting block 448 is provided with a second magnetic part 4481 matched with the first magnetic part 4361, the end part of the first connecting block 436 is obliquely arranged, the second connecting block 448 is obliquely arranged matched with the first connecting block 436, through the arrangement of the fourth elastic part, the first connecting block and the second connecting block can realize the telescopic effect, so that the fixing effect on the first locking strip and the second locking strip can be realized by mutual matching, the first locking strip and the second locking strip are prevented from loosening and losing the fixing effect on the first fastening cover and the second fastening cover, and the arrangement of the first permanent magnet and the second permanent magnet can strengthen the fixing force between the first connecting block and the second connecting block, avoid the pine between first connecting block and the second connecting block to take off, strengthen the joint strength of first connecting block and second connecting block, simultaneously to the inclined plane setting between first connecting block and the second connecting block, make first connecting block and second connecting block can only separate through the removal of specific mode, avoid leading to the pine of first locking strip and second locking strip to take off because of vibrations, strengthened the fixed strength of first connecting block and second connecting block to first locking strip and second locking strip.

In the embodiment, when the first locking strip and the second locking strip are turned over, the first locking strip is turned over first, then the second locking strip is turned over, so that the inclined planes on the first locking strip and the second locking strip are contacted with each other and attached, the first magnetic piece and the second magnetic piece can fix the first connecting block and the second connecting block, when the first locking strip and the second locking strip need to be separated, the first locking strip is turned over first, so that the first connecting block is continuously contracted into the third accommodating groove along the inclined plane and is moved obliquely along the inclined plane, so that the first connecting block can be easily and continuously slid along the inclined plane, until first connecting block contracts to the third holding tank completely in, realize the separation of first connecting block and second connecting block to can separate first locking strip and second locking strip.

The second oil outlet pipe 25 and the second oil inlet pipe 26 are respectively provided with a first backflow prevention assembly and a second backflow prevention assembly, and through the arrangement of the structure, when the filter is taken out, oil in the filter cannot flow back out, and meanwhile, the normal inlet and outlet of the oil cannot be influenced, so that the normal operation of the filter is ensured, and the filter is very practical and reliable; when fluid flows backwards, fluid does not have extra pressure effect, depends on self gravity downward flow, and fluid has extra output power to fluid effect when filtering for fluid has certain pressure when flowing out or flowing in.

The first backflow preventing assembly comprises a first sealing element 251 used for controlling the opening and closing of the second oil outlet pipe 25 and a first oil passing plate 252 matched with the first sealing element 251, wherein a first supporting column 253 is fixedly arranged on the first sealing element 251, and through the arrangement of the structure, the second oil outlet pipe can realize the opening and closing control of the second oil outlet pipe through the first sealing element, so that the backflow of oil liquid is avoided, and the normal outflow of the filtered oil liquid can be ensured; the second oil outlet pipe 25 is provided with a first support frame 254 for assisting the movement of the first support column 253, the first support frame 254 is fixedly provided with a first expansion spring 255 connected with the first sealing element 251, and the first support frame 254 is arranged below the first sealing element 251, so that the first sealing element can perform expansion movement through the first expansion spring to control the opening and closing of the second oil outlet pipe as required; above-mentioned first closing member adopts rubber materials to make, when flowing after fluid filters, has extra pressure to drive fluid and flows for fluid backs down first closing member, and first expanding spring is tensile, and first logical oiled-plate is opened, and fluid flows, and when taking out the filter, fluid does not have extra pressure, can't back down first closing member, thereby avoids the outflow of fluid.

The second backflow prevention assembly comprises a second sealing element 261 for controlling the opening and closing of the second oil inlet pipe 26 and a second oil through plate 262 matched with the second sealing element 261, a second support column 263 is fixedly arranged on the second sealing element 261, and through the arrangement of the structure, the second oil inlet pipe can realize the opening and closing control of the second oil inlet pipe through the second sealing element, so that the backflow of oil is avoided, and the normal entering of unfiltered oil can be ensured; the second oil inlet pipe 26 is provided with a second support frame 264 for assisting the movement of the second support column 263, the first support frame 264 is fixedly provided with a second expansion spring 265 connected with the second closing part 261, and the second support frame 264 is arranged above the second closing part 261, so that the second closing part can be expanded and contracted through the second expansion spring through the arrangement of the structure, and the opening and closing of the second oil inlet pipe can be controlled conveniently along with the requirement; above-mentioned second closure adopts rubber materials to make, when treating filterable fluid inflow filter, has extra pressure to drive fluid and flows for fluid backs down the second closure, and the second expanding spring is tensile, and the second oiled plate is opened, and fluid flows into the filter, and when taking out the filter, the second closure can directly close the second with the oiled plate through second expanding spring, thereby fluid can't flow backwards out.

Claims

1. An engine oil filter comprises a filter shell (1), a filter element (2) arranged in the filter shell (1), a cover body (3) matched with the filter shell (1), and a first fastening cover (41) and a second fastening cover (42) which are mutually combined and are covered on the shell (1) and the cover body (3); the top and the bottom of the filter element (2) are respectively provided with an upper filter element cover (22) and a lower filter element cover (23), and the upper filter element cover (22) is provided with an oil filter disc (24); the method is characterized in that: an internal threaded pipe (241) is arranged in the middle of the oil passing disc (24), a first oil inlet pipe (243) is arranged on the oil passing disc (24), a second oil outlet pipe (25) is arranged on the internal threaded pipe (241), a second oil inlet pipe (26) is arranged on the first oil inlet pipe (243), and a first backflow preventing assembly and a second backflow preventing assembly are respectively arranged on the second oil outlet pipe (25) and the second oil inlet pipe (26);

the second fastening cover (42) is respectively provided with a third sealing strip (411) and a fourth sealing strip (421), the first fastening cover (41) is provided with a first locking strip (433) and a second locking strip (443) for locking the first fastening cover (41) and the second fastening cover (42) and a first accommodating groove (434) for accommodating the first locking strip (433) and the second locking strip (434), two ends of the first accommodating groove are respectively provided with a rotatable connecting strip (435), and the connecting strips (435) at the two ends are respectively rotatably connected with the first locking strip (433) and the second locking strip (443); two ends of the second fastening cover (42) are respectively provided with a second accommodating groove (444), the second accommodating groove (444) is provided with a movable locking rod (445), the second fastening cover (42) is provided with a third accommodating groove (446) for the locking rod (445) to move, the third accommodating groove (446) is provided with a third elastic part (447) connected with the locking rod (445), and the locking rod (445) is matched with the first locking strip (433) and the second locking strip (443) to lock the first fastening cover (41) and the second fastening cover (42); the first locking strip (433) and the second locking strip (443) are respectively provided with a first connecting block (436) and a second connecting block (448) and a third moving groove (437) and a fourth moving groove (449) for moving the first connecting block (436) and the second connecting block (448);

all be equipped with fourth elastic component (438) of being connected with first connecting block (436) and second connecting block (448) on third removal groove (437) and fourth removal groove (449), be equipped with first magnetism spare (4361) on first connecting block (436), be equipped with on second connecting block (448) and magnetic component (4481) of second with first magnetism spare (4361) matched with, the tip of first connecting block (436) is the slope setting, second connecting block (448) are the slope setting with first connecting block (436) matched with.

2. An oil filter for an engine according to claim 1, wherein: the first backflow preventing assembly comprises a first sealing element (251) used for controlling the opening and closing of the second oil outlet pipe (25) and a first oil passing plate (252) matched with the first sealing element (251), and a first supporting column (253) is fixedly arranged on the first sealing element (251).

3. An oil filter for an engine according to claim 2, wherein: the second oil outlet pipe (25) is provided with a first support frame (254) used for assisting the first support column (253) to move, a first expansion spring (255) connected with the first sealing piece (251) is fixedly arranged on the first support frame (254), and the first support frame (254) is arranged below the first sealing piece (251).

4. An oil filter for an engine according to claim 3, wherein: the second backflow prevention assembly comprises a second closing piece (261) used for controlling the opening and closing of the second oil inlet pipe (26) and a second oil through plate (262) matched with the second closing piece (261), and a second supporting column (263) is fixedly arranged on the second closing piece (261).

5. An oil filter for an engine according to claim 4, wherein: the second oil inlet pipe (26) is provided with a second supporting frame (264) used for assisting the second supporting column (263) to move, the first supporting frame (254) is fixedly provided with a second expansion spring (265) connected with the second closing part (261), and the second supporting frame (264) is arranged above the second closing part (261).