Self-cleaning air filter for automobile engine

Abstract

The application discloses a self-cleaning air filter for an automobile engine and relates to the technical field of vehicle filters.The self-cleaning air filter comprises a cap, a filter core and a base, the cap and the base are arranged above and below the filter core respectively, the cap is provided with an air inlet hole, the base is provided with an air outlet hole connected with an engine, a piston valve is arranged in the cap, an adjusting spring is arranged between the piston valve and the lower end of the cap, a cleaning device is arranged along the outer edge of the filter core, a transmission structure is arranged in the filter core, the piston valve is driven to move up and down through the transmission structure, so that the cleaning device can be driven to rotate along the outer edge of the filter core and move up and down.The self-cleaning air filter can start the cleaning device to perform self-cleaning without external power control or signal control, and can still operate when a circuit fault occurs, and has the advantages of simple structure, high practicability, low cost and the like, and the service life of the filter is effectively prolonged.

Description

Technical Field

[0001] This invention relates to the field of automotive filter technology, specifically to a self-cleaning air filter for automotive engines. Background Technology

[0002] The air filter is a crucial component of a car, primarily used to filter dust and impurities from the air, providing clean air to the internal combustion engine and reducing engine wear. With traditional air filters, when impurities and dust accumulate on the filter element surface, reducing the amount of air entering the filter's pores and affecting the engine's air demand, the entire air filter must be replaced, increasing costs.

[0003] Currently, there are some air filters on the market with self-cleaning functions. For example, the Chinese utility model patent "Automotive Automatic Cleaning Air Filter" (CN2851622Y) discloses an automotive automatic cleaning air filter. It cleans the filter element by setting an inner cleaning pipe and an outer cleaning pipe inside and outside the filter element, and by driving the inner cleaning pipe and the outer cleaning pipe through an air pump or air tank. Although the existing air filter can clean the filter element and extend the service life of the filter, it requires external power control or signal to control the cleaning work. When a circuit failure occurs, it will not work. It has defects such as complex structure, high cost and poor reliability. Summary of the Invention

[0004] To address the problems of existing self-cleaning air filters requiring external power control or signals to control the cleaning process, which renders them inoperable in the event of a circuit failure, and which are characterized by complex structures, high costs, and poor reliability, this invention provides a self-cleaning air filter for automotive engines that features a self-cleaning function, eliminates the need for external power control or signal control, and boasts a simple structure, high practicality, and low cost.

[0005] The technical solution provided by this invention is as follows:

[0006] A self-cleaning air filter for automotive engines includes a cap, a filter element, and a base. The cap and base are respectively located above and below the filter element. The cap has an air inlet, and the base has an air outlet connected to the engine. A piston disc is provided inside the cap, and an adjusting spring is provided between the piston disc and the lower end of the cap. A cleaning device is provided on the outer edge of the filter element, and a transmission mechanism is provided inside the filter element. The piston disc moves up and down via the transmission mechanism, thereby driving the cleaning device to rotate and move up and down along the outer edge of the filter element.

[0007] Furthermore, the lower end of the cap is provided with several fan-shaped holes, and the number of cleaning devices is adapted to the number of fan-shaped holes. The cleaning device includes a connecting rod, a bracket, and a cleaning strip. The upper end of the connecting rod is connected to a piston flap, and the lower end passes through the fan-shaped holes and is connected to the bracket. The inner side of the cleaning strip is fixed to the bracket, and the outer side is attached to the outer edge of the filter element.

[0008] Preferably, the transmission mechanism includes a vertical plate, a spiral groove, a horizontal guide rod, and a vertical guide rod. The lower end of the vertical plate is connected to the base. The spiral groove is located at the upper end of the vertical plate. One end of the horizontal guide rod is provided with a guide post, and the other end is connected to the lower end of the vertical guide rod. The guide post is located in the spiral groove. The upper end of the vertical guide rod is connected to the piston disc.

[0009] Furthermore, the piston disc is provided with an adjustment device for adjusting the cleaning frequency of the cleaning device.

[0010] Preferably, the adjusting device includes a top rod, a pressure sleeve, an adjusting sleeve, an adjusting rod, and a spring ring. The adjusting rod is integrally formed with the piston disc, and the piston disc has a through hole. The lower end of the spring ring abuts against the adjusting spring. The lower end of the top rod abuts against the spring ring, and the upper end passes through the through hole. A sealing ring is provided between the top rod and the through hole. The pressure sleeve is located above the top rod, and the adjusting sleeve is located above the pressure sleeve and is threadedly connected to the adjusting rod.

[0011] Furthermore, the cap is equipped with a lift-generating device to improve the cleaning efficiency of the cleaning device.

[0012] Preferably, the lifting device includes a lifting ring and a preload spring. The lifting ring is located outside the piston disc and is linked to the piston disc. An isolation groove is provided on the lower side of the lifting ring, and an isolation ring is provided on the cap corresponding to the isolation groove. The isolation ring divides the space between the lifting ring and the cap into a lower inner cavity and a lower outer cavity. The lower inner cavity is connected to the inner cavity of the filter element, and the lower outer cavity is connected to the external atmosphere. The preload spring is located in the lower inner cavity, with its upper end pressing against the lower end face of the lifting ring and its lower end pressing against the cap.

[0013] Preferably, the lifting ring has an inclined guide surface near the piston disc.

[0014] Preferably, the piston disc extends downward at both ends to form guide rings, the guide rings and the lifting rings form a sliding seal fit, and a breathing chamber is provided between the guide rings and the lifting rings.

[0015] Preferably, a one-way valve is provided at the upper end of the cap corresponding to the position of the lifting ring.

[0016] The beneficial effects of this invention are as follows: This invention features a piston flap inside the cap, an adjusting spring between the piston flap and the lower end of the cap, a cleaning device along the outer edge of the filter element, and a transmission mechanism inside the filter element. As more and more impurities, dust, and particulate matter are adsorbed onto the outer surface of the filter element, the flow rate of external air into the inner cavity decreases, creating negative pressure within the inner cavity. The difference between the medium pressure inside the cavity and the air pressure outside the filter element increases, causing the piston flap to move downwards. Through the transmission mechanism, this causes the cleaning device to rotate and move downwards. The cleaning device can be activated for self-cleaning without external power or signal control. It can still operate even in the event of a circuit failure. It has advantages such as simple structure, strong practicality, and low cost, effectively improving the service life of the filter. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0018] Figure 2 for Figure 1 EE section view;

[0019] Figure 3 This is a schematic diagram of another embodiment of the present invention;

[0020] Figure 4 for Figure 3 A schematic diagram of the self-cleaning state in the embodiment;

[0021] Figure 5 for Figure 4 A magnified view of a portion of the image.

[0022] The components are as follows: 1-base, 2-air outlet, 3-collection groove, 4-filter element, 5-vertical plate, 6-spiral groove, 7-horizontal guide rod, 8-guide ring, 9-fan-shaped hole, 10-lower cavity, 11-adjusting spring, 12-piston disc, 13-upper cavity, 14-air inlet, 15-cap, 16-connecting rod, 17-sealing ring, 18-bracket, 19-cleaning strip, 20-vertical guide rod, 21-inner cavity, 22-top rod, 23-pressure sleeve, 24-adjustment. 25-Adjusting rod, 26-Spring ring, 27-Upper vent, 28-Lifting ring, 29-One-way valve, 30-Isolation groove, 31-Isolation ring, 32-Preload spring, 33-Rotating connecting rod, 34-Rotating connecting groove, 35-Lower vent, 36-Support plate, 37-Lifting chamber, 38-Slanted guide surface, 39-Upper sealing surface, 40-Lower sealing surface, 41-Recoil chamber, 42-Lower inner chamber, 43-Lower outer chamber, 44-Breathing chamber. Detailed Implementation

[0023] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0024] like Figure 1-2As shown, a preferred embodiment of the present invention provides a self-cleaning air filter for an automotive engine, including a cap 15, a filter element 4, and a base 1. The cap 15 and the base 1 are respectively located above and below the filter element 4. The cap 15 is provided with an air inlet 14, and the base 1 is provided with an air outlet 2 connected to the engine. When working, the engine starts, and under the action of the engine's suction, external air passes through the filter element 4 to reach the inner cavity 21, and is then discharged to the engine through the air outlet 2. Some impurities, dust, and particulate matter in the external air are adsorbed on the outer surface of the filter element 4 under the action of the filter element 4. At this time, the gas pressure in the inner cavity is basically consistent with the air pressure outside the filter element. The cap 15 is provided with a piston flap 12, which divides the cap 15 into an upper chamber 13 and a lower chamber 10. An adjusting spring 11 is provided between the piston flap 12 and the lower end of the cap 15. The lower end of the cap 15 is provided with several fan-shaped holes 9. The outer edge of the filter element 4 is provided with a cleaning device that matches the number of fan-shaped holes. The base 1 is provided with a collection trough 3 for collecting particles and other materials cleaned by the cleaning device.

[0025] In this embodiment, the cleaning device includes a connecting rod 16, a bracket 18, and a cleaning strip 19. The upper end of the connecting rod 16 is connected to the piston flap 12, and the lower end passes through the fan-shaped hole 9 and is connected to the bracket 18. The inner side of the cleaning strip 19 is fixed to the bracket 18, and the outer side is attached to the outer edge of the filter element 4.

[0026] In this embodiment, a transmission mechanism is provided in the inner cavity 21 of the filter element, which includes a vertical plate 5, a spiral groove 6, a horizontal guide rod 7, and a vertical guide rod 20. The lower end of the vertical plate 5 is connected to the base 1. The spiral groove 6 is located at the upper end of the vertical plate 5. One end of the horizontal guide rod 7 is provided with a guide post, and the other end is connected to the lower end of the vertical guide rod 20. The guide post is located in the spiral groove 6. The upper end of the vertical guide rod 20 is connected to the piston disc 12. The up-and-down movement of the piston disc 12 will drive the guide post to move in the spiral groove 6, thereby driving the piston disc 12 to rotate, and then driving the cleaning device to rotate and move up and down along the outer edge of the filter element 4.

[0027] The air filter in this embodiment operates as follows:

[0028] As more and more impurities, dust, and particulate matter are adsorbed onto the outer surface of the filter element 4, the flow rate of external air into the inner cavity 21 decreases, creating negative pressure in the inner cavity 21. The difference between the medium pressure in the inner cavity 21 and the air pressure outside the filter element increases. Simultaneously, since the upper cavity 13 is connected to the external air through the air inlet 14, when the pressure difference between the upper cavity 13 and the inner cavity 21 reaches the preset pressure value of the adjusting spring 11, the piston disc 12 moves downward. At the same time, under the action of the spiral groove 6 and the horizontal guide rod 7, the cleaning device rotates and moves downward, scraping away impurities, dust, and particulate matter from the outer surface of the filter element 4. As the impurities, dust, and particulate matter on the outer surface of the filter element 4 are removed, the flow rate of external air entering the inner cavity through the filter element increases, the medium pressure in the inner cavity 21 rises, and the pressure difference between the upper cavity 13 and the inner cavity 21 decreases. Under the action of the adjusting spring 11, the piston disc 12 moves upward, causing the cleaning device to return to its initial position.

[0029] In a preferred embodiment provided by the present invention, such as Figure 3-5 As shown, the piston disc 12 is equipped with an adjustment device, including a push rod 22, a pressure sleeve 23, an adjustment sleeve 24, an adjustment rod 25, and a spring ring 26. The adjustment rod 25 is integrally formed with the piston disc 12. The piston disc 12 has a through hole. The lower end of the spring ring 26 abuts against the adjustment spring 11. The lower end of the push rod 22 abuts against the spring ring 26, and the upper end passes through the through hole. A sealing ring is provided between the push rod and the through hole. The pressure sleeve 23 is located above the push rod 22, and the adjustment sleeve 24 is located above the pressure sleeve 23 and is threadedly connected to the adjustment rod 25. By rotating the adjustment sleeve 24, the pressure sleeve 23 and the push rod 22 are moved up or down, controlling the compression of the adjustment spring 11, that is, controlling the upward thrust of the adjustment spring 11 on the piston disc 12, thereby controlling the sealing pressure ratio between the upper and lower sealing surfaces. Then, when the medium pressure in the inner cavity reaches the negative pressure set value, the piston disc moves down, thereby driving the cleaning device to start the cleaning operation. The adjustment device effectively controls the timing of starting self-cleaning, and effectively sets the level of filter blockage, air volume reduction, and internal negative pressure to initiate self-cleaning, thus meeting the air volume requirements of various engines.

[0030] Furthermore, the cap 15 is equipped with a lifting burst device. In this embodiment, the lifting burst device includes a lifting ring 28 and a preload spring 32. The lifting ring 28 is located outside the piston disc 12. The lifting ring 28 and the piston disc 12 are linked together by a rotating connecting rod 33 and a rotating connecting groove 34. An isolation groove 30 is provided on the lower side of the lifting ring 28. The cap 15 is equipped with an isolation ring 31 corresponding to the isolation groove 30. The isolation ring 31 divides the space between the lifting ring 28 and the cap 15 into a lower inner cavity 42 and a lower outer cavity 43. The lower inner cavity 42 is connected to the inner cavity 21 of the filter element, and the lower outer cavity 43 is connected to the external atmosphere. The cleaning device is located in the lower outer cavity 43, and the preload spring 32 is located in the lower inner cavity 42. Its upper end presses against the lower end face of the lifting ring 28, and its lower end presses against the cap. The lifting burst device can effectively increase the speed of the cleaning device's rotational descent and rotational ascent during self-cleaning, effectively improving the cleaning efficiency.

[0031] In this embodiment, the lifting ring 28 is provided with an inclined guide surface 38 near the piston disc. When the lifting ring is in its initial position, the inclined guide surface 38 and the upper end of the cap form a recoil chamber 41, improving the movement efficiency of the lifting ring 28. A one-way valve 29 is provided at the upper end of the cap 15 corresponding to the position of the lifting ring 28. When the lifting ring 28 is reset, the air that has been compressed in the lifting ring 28 can be discharged, preventing jamming.

[0032] The air filter in this embodiment operates as follows:

[0033] As more and more impurities, dust, and particulate matter are adsorbed onto the outer surface of the filter element 4, the flow rate of external air into the inner cavity decreases, creating negative pressure in the inner cavity 21. The difference between the medium pressure in the inner cavity 21 and the air pressure outside the filter element 4 increases. Simultaneously, since the air inlet 14 connects to the external air, when the pressure difference between the air inlet 14 and the inner cavity 21 reaches the preset pressure value of the adjusting spring 11, the piston disc 12 moves downward, and the lower sealing surface 40 of the piston disc 12 disengages from the upper sealing surface 39 of the cap 15. External air enters the backflow chamber 41 through the air inlet 14. Due to the lower part of the lifting ring 28... Cavity 42 is connected to inner cavity 21, so the medium pressure in lower cavity 42 is the same as that in inner cavity 21. As the air medium in backwash cavity 41 increases, the upper part of lifting ring 28 detaches from the upper top surface inside cap 15, and a lifting cavity 37 is formed between lifting ring 28 and the upper top surface inside cap 15. Air in backwash cavity 41 enters lifting cavity 37, and the pressure difference between the upper and lower parts of lifting ring 28 increases instantaneously. Lifting ring 28 and piston disc 12 move downward rapidly. At the same time, under the action of spiral groove 6 and horizontal guide rod 7, the cleaning device is driven to rotate and move downward, scraping off impurities, dust, particles and other substances from the outer surface of the filter element. As impurities, dust, and particulate matter on the outer surface of the filter element are removed, the flow rate of external air entering the inner cavity 21 through the filter element increases, the medium pressure in the inner cavity 21 rises, and the pressure difference between the piston disc 12 and the upper part of the lifting ring 28 and the inner cavity decreases. Under the action of the adjusting spring 11, the piston disc 12 and the lifting ring 28 move upward, driving the cleaning device back to its initial position. At the same time, the lower sealing surface 40 presses against the upper sealing surface 39, and the lifting ring continues to rise under the action of the pre-compression spring 32. The medium in the lifting cavity 37 is discharged through the one-way valve 29, and the upper part of the lifting ring 28 presses against the upper top surface inside the cap again.

[0034] Furthermore, the piston disc 12 extends downward at both ends to form guide rings 8. The guide rings 8 and the lifting ring 28 form a sliding seal fit. The upper end of the guide ring 8 is provided with an upper vent hole 27, and a venting chamber 44 is provided between the guide ring 8 and the lifting ring 28. The lower end of the lifting ring 28 is provided with a lower vent hole 35. The fit between the vent hole and the venting chamber ensures that the piston disc 12 and the lifting ring 28 can form flexible upper and lower relative movements, preventing the piston disc 12 from being unable to continue rising when the lifting ring 28 rises to the initial position. This ensures that when the lifting device returns to the initial position, the upper and lower sealing surfaces can fully contact and form a seal.

[0035] The embodiments should not be construed as limiting the present invention, and any non-creative improvements made based on the spirit of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A self-cleaning air filter for automotive engines, comprising a cap, a filter element, and a base, wherein the cap and base are respectively disposed above and below the filter element, the cap having an air inlet, and the base having an air outlet connected to the engine, characterized in that: The cap is provided with a piston flap, and an adjusting spring is provided between the piston flap and the lower end of the cap. A cleaning device is provided on the outer edge of the filter element, and a transmission mechanism is provided inside the filter element. The piston flap moves up and down and is driven by the transmission mechanism, thereby driving the cleaning device to rotate and move up and down along the outer edge of the filter element.

2. The self-cleaning air filter for an automotive engine according to claim 1, characterized in that: The cap has several fan-shaped holes at its lower end. The number of cleaning devices is matched with the number of fan-shaped holes. Each cleaning device includes a connecting rod, a bracket, and a cleaning strip. The upper end of the connecting rod is connected to a piston flap, and the lower end passes through the fan-shaped holes and is connected to the bracket. The inner side of the cleaning strip is fixed to the bracket, and the outer side is attached to the outer edge of the filter element.

3. The self-cleaning air filter for an automotive engine according to claim 1, characterized in that: The transmission mechanism includes a vertical plate, a spiral groove, a horizontal guide rod, and a vertical guide rod. The lower end of the vertical plate is connected to the base. The spiral groove is located at the upper end of the vertical plate. One end of the horizontal guide rod is provided with a guide post, and the other end is connected to the lower end of the vertical guide rod. The guide post is located in the spiral groove. The upper end of the vertical guide rod is connected to the piston disc.

4. A self-cleaning air filter for an automotive engine according to claim 1, characterized in that: The piston disc is equipped with an adjustment device for adjusting the cleaning frequency of the cleaning device.

5. A self-cleaning air filter for an automotive engine according to claim 4, characterized in that: The adjusting device includes a top rod, a pressure sleeve, an adjusting sleeve, an adjusting rod, and a spring ring. The adjusting rod is integrally formed with the piston disc, and the piston disc has a through hole. The lower end of the spring ring abuts against the adjusting spring. The lower end of the top rod abuts against the spring ring, and the upper end passes through the through hole. A sealing ring is provided between the top rod and the through hole. The pressure sleeve is located above the top rod, and the adjusting sleeve is located above the pressure sleeve and is threadedly connected to the adjusting rod.

6. A self-cleaning air filter for an automotive engine according to claim 1, characterized in that: The cap contains a lift-generating device to improve the cleaning efficiency of the cleaning device.

7. A self-cleaning air filter for an automotive engine according to claim 6, characterized in that: The lifting device includes a lifting ring and a preload spring. The lifting ring is located outside the piston disc and is linked to the piston disc. An isolation groove is provided on the lower side of the lifting ring, and an isolation ring is provided on the cap corresponding to the isolation groove. The isolation ring divides the space between the lifting ring and the cap into a lower inner cavity and a lower outer cavity. The lower inner cavity is connected to the inner cavity of the filter element, and the lower outer cavity is connected to the outside atmosphere. The preload spring is located in the lower inner cavity, with its upper end pressing against the lower end face of the lifting ring and its lower end pressing against the cap.

8. A self-cleaning air filter for an automotive engine according to claim 7, characterized in that: The lifting ring has an inclined guide surface near the piston disc.

9. A self-cleaning air filter for an automotive engine according to claim 7, characterized in that: The piston disc extends downward at both ends to form a guide ring, which forms a sliding seal with the lifting ring. A breathing chamber is provided between the guide ring and the lifting ring.

10. A self-cleaning air filter for an automotive engine according to claim 7, characterized in that: A one-way valve is provided at the upper end of the cap corresponding to the position of the lifting ring.

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