Self-cleaning air filter capable of improving back flushing effect

Abstract

The utility model discloses a self-cleaning air filter capable of improving the blowback effect, belongs to the technical field of filters, and solves the problem that an existing self-cleaning air filter is poor in blowback effect. The first-stage filter comprises a first-stage filter shell and a first-stage filter element, an annular air channel is formed in the bottom of the inner side of the first-stage filter element, a connecting pipe is arranged on the inner side of the annular air channel, a sinking groove is formed in the bottom of a clamping plate between every two adjacent clamping grooves, and a drainage pipe is arranged at the top of the connecting pipe. The drainage tube is a tube body with an annular lower portion, a hollow middle portion and a narrowed upper portion, at least one insertion piece is arranged at the top of the drainage tube, the number of the insertion pieces is smaller than or equal to that of the sinking grooves, and the insertion pieces are inserted into the sinking grooves. According to the self-cleaning air filter, the self-cleaning efficiency can be effectively improved, and the service life of the air filter is further prolonged.

Description

Technical Field

[0001] This utility model relates to filters, and more specifically, to a self-cleaning air filter that improves backflushing performance. Background Technology

[0002] An air filter is an essential component of an engine. Located in front of the intake manifold, it filters out dust and sand particles from the air, ensuring that sufficient clean air enters the cylinders. Traditional air filters, especially those used in high-dust areas, require frequent disassembly and reassembly, resulting in high maintenance costs. With the continuous maturation of air filter technology, the industry has developed self-cleaning air filters, which can automatically remove dust from the air filter element.

[0003] For example, patent application number 202420266825.7 discloses an integrated self-cleaning air filter. This filter utilizes the gas pressure in the air tank; gas instantly passes through a solenoid valve and air pipe, enters the annular air passage and fills the entire annular air passage, and is then released into the air filter element. Under the action of the internal and external pressure difference, the gas inside the air filter element is released from the inside to the outside, forming an instantaneous backflush airflow from the inside to the outside, thereby causing dust on the outer surface of the air filter element to fall off, achieving self-cleaning of the air filter element.

[0004] However, in the aforementioned self-cleaning air filter, the inner tube corresponding to its annular air passage only extends to the lower part of the air filter element. After the backflushing airflow enters the annular air passage, when the airflow rises to the upper part of the air filter element, there is a lack of radial airflow guidance, resulting in an unsatisfactory cleaning effect on the upper part of the air filter element.

[0005] Therefore, there is an urgent need to design a self-cleaning air filter that improves the backflushing effect in order to solve the above-mentioned technical problems. Utility Model Content

[0006] The technical problem to be solved by this utility model is to address the above-mentioned shortcomings of the prior art. Its purpose is to provide a self-cleaning air filter that improves the backflushing effect, effectively improves the self-cleaning efficiency, and further extends the service life of the air filter.

[0007] The technical solution of this utility model is as follows: A self-cleaning air filter with improved backflushing effect includes a primary filter housing and a primary filter element. The primary filter element is inserted into the primary filter housing. A primary filter top cover is detachably installed on the top of the primary filter housing to press the primary filter element into the housing. An annular air passage is provided on the bottom inner side of the primary filter element, and a connecting pipe is provided on the inner side of the annular air passage. A snap-fit ​​plate is embedded and fixed in the middle of the top of the primary filter element. The filter has multiple slots arranged in a quincunx pattern. The bottom center of the top cover of the primary filter has at least one tooth protruding from it. The number of teeth is less than or equal to the number of slots, and the teeth are inserted into the slots. A groove is formed at the bottom of the connecting plate between two adjacent slots. The top of the connecting pipe has a drain pipe. The drain pipe is a tube that is annular at the bottom, hollow in the middle, and narrows at the top. The top of the drain pipe has at least one insert. The number of inserts is less than or equal to the number of grooves, and the inserts are inserted into the grooves.

[0008] As a further improvement, the snap-fit ​​plate includes an inner ring closed at the top and an outer ring open at both the top and bottom. The outer ring is fitted around the inner ring, and the inner ring and the outer ring are sealed together by a connecting plate. Multiple snap-fit ​​grooves are evenly recessed on the top of the connecting plate. The top of the outer ring is also provided with multiple insert pieces, which are embedded in the PU cover on the top of the primary filter element.

[0009] Furthermore, each of the aforementioned embedded chips has a first optical aperture.

[0010] Furthermore, the top of the outer ring is also connected to a tapered ring that is wider at the top and narrower at the bottom. The embedded piece is connected to the tapered ring, and the outer wall of the tapered ring is provided with a plurality of first reinforcing ribs. The two ends of the first reinforcing ribs extend to the junction of the tapered ring, the embedded piece, and the outer ring, respectively.

[0011] Furthermore, a connecting ring is also provided in the middle of the bottom of the top cover of the primary filter, and the retaining teeth are provided at the bottom of the connecting ring.

[0012] Furthermore, the top of the primary filter cover surrounding the connecting ring is provided with multiple intersecting second reinforcing ribs, and the bottom of the primary filter cover inside the connecting ring is also provided with multiple intersecting third reinforcing ribs.

[0013] Furthermore, the upper outer wall of the primary filter housing is provided with multiple air inlets, and the upper part of the primary filter housing is also provided with a rain cap that surrounds the air inlets.

[0014] Furthermore, the lower part of the rain cap is connected to the housing of the primary filter via multiple brackets.

[0015] Furthermore, the drainage tube includes a lower tube body, a hollow tube, and a conical tube, which are connected sequentially from bottom to top. The lower tube body is fixedly installed on the connecting tube, and the insert is fixed to the top of the conical tube.

[0016] Furthermore, the air filter also includes a secondary filter housing and a secondary filter element. The secondary filter element is inserted into the secondary filter housing. A secondary filter top cover is detachably installed on the top of the secondary filter housing to press the secondary filter element into the secondary filter housing. The air outlet of the primary filter element is connected to the air inlet of the secondary filter element.

[0017] Beneficial effects

[0018] Compared with the prior art, this utility model has the following advantages:

[0019] 1. The self-cleaning air filter of this utility model has a slot and tooth engagement structure between the top cover of the filter and the top of the filter element. During maintenance, only original equipment manufacturer (OEM) standard filter elements can be matched with the tooth structure of the top cover of the filter. Filter elements of other manufacturers cannot be matched with the top cover of the filter, thus avoiding the installation of the wrong filter element that does not meet the filtration effect. It can not only effectively position the air filter element for installation, but also prevent the filter element from rotating circumferentially, ensuring the filtration effect of the air filter. At the same time, the PU top cover is embedded with a snap-fit ​​plate, which can effectively improve the structural strength of the filter element.

[0020] 2. The self-cleaning air filter of this utility model has a guide pipe installed on the connecting pipe inside the annular air passage. When the air filter element is back-flushed cleaned, the back-flushing airflow in the annular air passage rises to the upper part of the air filter element. Under the obstruction of the upper part of the guide pipe, it can be radially guided to the upper part of the air filter element, which increases the impact force of the back-flushing airflow on the upper part of the air filter element, effectively improving the self-cleaning efficiency and further extending the service life of the air filter. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0023] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0024] Figure 4 This is an enlarged three-dimensional structural diagram of one side of the top of the card-connecting plate in this utility model;

[0025] Figure 5This is an enlarged three-dimensional structural diagram of one side of the bottom of the card-connecting plate in this utility model;

[0026] Figure 6 This is an enlarged three-dimensional structural diagram of one side of the bottom of the top cover of the primary filter in this utility model;

[0027] Figure 7 This is an enlarged three-dimensional structural diagram of the drainage tube in this utility model.

[0028] The components are: 1-First-stage filter housing, 2-First-stage filter element, 3-First-stage filter top cover, 4-Snap-fit ​​plate, 5-Snap-fit ​​groove, 6-Snap-fit ​​tooth, 7-PU top cover, 8-Connecting ring, 9-Second reinforcing rib, 10-Third reinforcing rib, 11-Air inlet, 12-Rainproof cap, 13-Bracket, 14-Second-stage filter housing, 15-Second-stage filter element, 16-Second-stage filter top cover, 17-Annular air passage, 18-Connecting pipe, 19-Sink, 20-Drainage pipe, 21-Insertion plate, 41-Inner ring, 42-Outer ring, 43-Connecting plate, 44-Embedded plate, 45-First aperture, 46-Conical ring, 47-First reinforcing rib, 48-Second aperture, 201-Lower tube body, 202-Hollow tube, 203-Conical tube. Detailed Implementation

[0029] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0030] See Figure 1-7This utility model discloses a self-cleaning air filter with improved backflushing effect, comprising a primary filter housing 1 and a primary filter element 2. The primary filter element 2 is inserted into the primary filter housing 1. A primary filter top cover 3 is detachably installed on the top of the primary filter housing 1 to press the primary filter element 2 into the housing, thus forming a primary air filter that performs coarse filtration. An annular air passage 17 is provided at the bottom inner side of the primary filter element 2, and a connecting pipe 18 is provided inside the annular air passage 17. A backflushing system communicating with the annular air passage 17 is also provided on the periphery of the primary filter housing 1. The principle of this backflushing system is the same as that of the technical solution system with patent number 202420266825.7, and will not be described in detail here. A snap-fit ​​plate 4 is embedded and fixed in the middle of the top of the primary filter element 2, which can effectively improve the structural strength of the filter element. Multiple slots 5 arranged in a quincunx pattern are formed on the snap-fit ​​plate 4. At least one snap tooth 6 is raised in the middle of the bottom of the primary filter top cover 3. The number of snap teeth 6 is less than or equal to the number of slots 5, ensuring that the snap teeth 6 can be engaged in the slots 5. Only filter elements with snap teeth 5 can cooperate with the primary filter top cover 3 to complete the assembly of the primary filter. In this embodiment, the number of snap teeth 6 is the same as the number of slots 5. In other embodiments, the number of snap teeth 6 is less than the number of slots 5, which makes it easier for users to assemble the primary filter top cover 3 onto the primary filter housing 1. Preferably, the snap-fit ​​plate 4 includes an inner ring 41 that is closed at the top and an outer ring 42 that is open at both the top and bottom. The outer ring 42 is fitted around the inner ring 41, and the inner ring 41 and the outer ring 42 are sealed together by a connecting plate 43, so that the entire snap-fit ​​plate 4 is a closed structure to prevent air leakage and meet the filtration requirements of the filter element. Multiple slots 5 are evenly recessed on the top of the connecting plate 43. The slots 5 can be formed by stamping or integral casting on the connecting plate 43. This forming method can form a recess 19 at the bottom of the snap-fit ​​plate 4 between two adjacent slots 5. Multiple insert pieces 44 are also provided on the top of the outer ring 42. The insert pieces 44 are embedded in the PU cover 7 on the top of the primary filter element 2 to facilitate the fixed connection between the snap-fit ​​plate 4 and the PU cover 7 of the filter element.

[0031] This utility model of an air filter features a structure where a slot 5 and a tooth 6 engage between the top cover and the top of the filter element. During maintenance, only original equipment manufacturer (OEM) standard filter elements can be matched with the tooth structure of the filter top cover; filter elements from other manufacturers cannot be matched with the filter top cover. This prevents the installation of incorrect filter elements that do not meet filtration requirements. It not only effectively positions the air filter element but also prevents the filter element from rotating circumferentially, ensuring the filtration effect of the air filter. At the same time, a snap-fit ​​plate 4 is embedded in the PU top cover 7, which effectively improves the structural strength of the filter element.

[0032] Preferably, a drainage pipe 20 is provided at the top of the connecting pipe 18. The drainage pipe 20 is a tube with a ring-shaped lower part, a hollow middle part, and a narrowing upper part. Air filtered by the primary filter element 2 can be discharged through the hollow hole in the middle of the drainage pipe 20. The top of the drainage pipe 20 is provided with at least one insert 21. The number of inserts 21 is less than or equal to the number of sinks 19, and the inserts 21 are inserted into the sinks 19. The insertion of the inserts 21 into the sinks 19 can further prevent the drainage pipe 20 from rotating circumferentially relative to the primary filter element 2, thereby improving the structural stability of the drainage pipe 20. In this embodiment, the number of inserts 21 is the same as the number of sinks 19. In other embodiments, the number of inserts 21 is less than the number of sinks 19. This makes it easier for workers to assemble the PU cover 7 with the snap-fit ​​plate 4 embedded on the drainage pipe 20, thereby improving assembly efficiency.

[0033] The self-cleaning air filter of this invention has a guide pipe 20 installed on the connecting pipe 18 inside the annular air passage 17. When the air filter element is back-blown cleaned, the back-blowing airflow of the annular air passage 17 rises to the upper part of the air filter element. Under the obstruction of the upper part of the guide pipe 20, it can be radially guided to the upper part of the air filter element, which increases the impact force of the back-blowing airflow on the upper part of the air filter element, effectively improving the self-cleaning efficiency and further extending the service life of the air filter.

[0034] Preferably, each insert 44 has a first optical hole 45. When the snap-fit ​​plate 4 is connected to the PU cover 7, the PU adhesive of the PU cover 7 can be melted into the first optical hole 45, thereby improving the connection reliability between the insert 44 and the PU cover 7.

[0035] Preferably, a tapered ring 46, wider at the top and narrower at the bottom, is connected to the top of the outer ring 42. The embedded piece 44 is connected to the tapered ring 46. The funnel-shaped tapered ring 46 can guide the locking teeth 6, making it easy to engage the locking teeth 6 into the locking groove 5. Multiple first reinforcing ribs 47 are provided on the outer wall of the tapered ring 46. The two ends of the first reinforcing ribs 47 extend to the connection points of the tapered ring 46, the embedded piece 44, and the outer ring 42, respectively, further improving the structural strength of the locking plate 4.

[0036] Preferably, a plurality of second light holes 48 are provided on the top edge of the conical ring 46, and the PU cover 7 covers the second light holes 48. The PU adhesive of the PU cover 7 can also be melted into the second light holes 48, further improving the connection reliability between the connecting plate 4 and the PU cover 7.

[0037] Preferably, a connecting ring 8 is raised in the middle of the bottom of the top cover 3 of the primary filter, and a retaining tooth 6 is set at the bottom of the connecting ring 8. The retaining tooth 6 is integrally formed on the connecting ring 8, which can effectively improve the structural strength of the retaining tooth 6 and avoid the problem of its breakage.

[0038] Preferably, a plurality of intersecting second reinforcing ribs 9 are provided on the top of the primary filter top cover 3 outside the connecting ring 8. Correspondingly, a plurality of intersecting third reinforcing ribs 10 are also provided on the bottom of the primary filter top cover 3 inside the connecting ring 8. The reinforcing rib structure with the second reinforcing ribs 9 and the third reinforcing ribs 10 can further improve the structural strength of the primary filter top cover 3.

[0039] Preferably, multiple air inlets 11 are provided on the upper outer wall of the primary filter housing 1. A rain cap 12, surrounding the air inlets 11, is also provided on the upper part of the primary filter housing 1. The rain cap 12 is an L-shaped ring structure that blocks the outer side of the air inlets 11, preventing rainwater from being drawn into the filter element along with the air. Furthermore, the lower part of the rain cap 12 is connected to the primary filter housing 1 via multiple supports 13. The supports 13 are evenly distributed, further reinforcing the rain cap 12 and preventing it from loosening due to long-term vibration, effectively extending its service life.

[0040] Preferably, the drainage tube 20 includes a lower tube body 201, a hollow tube 202, and a tapered tube 203. The lower tube body 201, the hollow tube 202, and the tapered tube 203 are connected sequentially from bottom to top and can be manufactured in one piece, resulting in better structural strength. The lower tube body 201 is fixedly installed on the connecting tube 18 and can be fixed by welding. The insert 21 is fixed to the top of the tapered tube 203. The insert 21 can also be set on the top of the tapered tube 203 in one piece, resulting in better structural strength.

[0041] Preferably, the air filter further includes a secondary filter housing 14 and a secondary filter element 15. The secondary filter element 15 is inserted into the secondary filter housing 14. The top of the secondary filter housing 14 is detachably fitted with a secondary filter top cover 16 that presses the secondary filter element 15 into the secondary filter housing 14. The air outlet of the primary filter element 2 is connected to the air inlet of the secondary filter element 15. That is, the connecting pipe 18 corresponding to the primary filter element 2 is connected to the air inlet of the secondary filter element 15, thus forming a secondary air filter that functions as a safety filter. In particular, the structure of the secondary filter element 15 and the secondary filter top cover 16 in this embodiment is different from that of the primary filter element 2 and the primary filter top cover 3 corresponding to the primary filter. It does not have the structure of the slot 5 and the tooth 6. This structural design makes it easier for users to distinguish between the primary air filter and the air filter element corresponding to the secondary air filter, and makes maintenance more convenient.

[0042] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present utility model. These modifications and improvements will not affect the effectiveness of the present utility model or the practicality of the patent.

Claims

1. A self-cleaning air filter with improved backflushing effect, comprising a primary filter housing (1) and a primary filter element (2), wherein the primary filter element (2) is inserted into the primary filter housing (1), and a primary filter top cover (3) is detachably installed on the top of the primary filter housing (1) to press the primary filter element (2) into the primary filter housing (1), wherein an annular air passage (17) is provided on the inner bottom of the primary filter element (2), and a connecting pipe (18) is provided on the inner side of the annular air passage (17), characterized in that, A snap-fit ​​plate (4) is embedded and fixed in the middle of the top of the primary filter element (2). The snap-fit ​​plate (4) has multiple slots (5) arranged in a plum blossom pattern. The bottom of the primary filter top cover (3) has at least one snap tooth (6) protruding in the middle. The number of snap teeth (6) is less than or equal to the number of slots (5), and the snap teeth (6) are inserted into the slots (5). A recessed groove (19) is formed at the bottom of the snap-fit ​​plate (4) between two adjacent slots (5). A drain pipe (20) is provided at the top of the connecting pipe (18). The drain pipe (20) is a tube with a ring shape at the bottom, a hollow shape in the middle, and a narrowing shape at the top. At least one insert (21) is provided at the top of the drain pipe (20). The number of inserts (21) is less than or equal to the number of recessed grooves (19), and the inserts (21) are inserted into the recessed grooves (19).

2. A self-cleaning air filter with improved backflushing effect according to claim 1, characterized in that, The snap-fit ​​plate (4) includes an inner ring (41) closed at the top and an outer ring (42) open at both ends. The outer ring (42) is fitted around the inner ring (41). The inner ring (41) and the outer ring (42) are sealed together by a connecting plate (43). Multiple snap-fit ​​grooves (5) are evenly recessed on the top of the connecting plate (43). The top of the outer ring (42) is also provided with multiple insert pieces (44). The insert pieces (44) are embedded in the PU cover (7) on the top of the primary filter element (2).

3. A self-cleaning air filter with improved backflushing effect according to claim 2, characterized in that, Each of the aforementioned embedded pieces (44) has a first optical aperture (45).

4. A self-cleaning air filter with improved backflushing effect according to claim 2, characterized in that, The top of the outer ring (42) is also connected to a tapered ring (46) that is wider at the top and narrower at the bottom. The embedded piece (44) is connected to the tapered ring (46). The outer wall of the tapered ring (46) is provided with a plurality of first reinforcing ribs (47). The two ends of the first reinforcing ribs (47) extend to the junction of the tapered ring (46) with the embedded piece (44) and the outer ring (42).

5. A self-cleaning air filter for improving backflushing effect according to claim 2, characterized in that, The bottom center of the top cover (3) of the primary filter is provided with a connecting ring (8), and the locking teeth (6) are provided at the bottom of the connecting ring (8).

6. A self-cleaning air filter with improved backflushing effect according to claim 5, characterized in that, The top of the primary filter cover (3) surrounding the connecting ring (8) is provided with multiple intersecting second reinforcing ribs (9), and the bottom of the primary filter cover (3) inside the connecting ring (8) is also provided with multiple intersecting third reinforcing ribs (10).

7. A self-cleaning air filter for improving backflushing effect according to claim 1, characterized in that, The upper outer wall of the primary filter housing (1) is provided with multiple air inlets (11), and the upper part of the primary filter housing (1) is also provided with a rain cap (12) that surrounds the air inlets (11).

8. A self-cleaning air filter with improved backflushing effect according to claim 7, characterized in that, The lower part of the rain cap (12) is connected to the primary filter housing (1) via multiple brackets (13).

9. A self-cleaning air filter for improving backflushing effect according to claim 1, characterized in that, The drainage tube (20) includes a lower tube body (201), a hollow tube (202), and a conical tube (203). The lower tube body (201), the hollow tube (202), and the conical tube (203) are connected in sequence from bottom to top. The lower tube body (201) is fixedly installed on the connecting tube (18), and the insert (21) is fixed on the top of the conical tube (203).

10. A self-cleaning air filter for improving backflushing effect according to any one of claims 1-9, characterized in that, The air filter also includes a secondary filter housing (14) and a secondary filter element (15). The secondary filter element (15) is inserted into the secondary filter housing (14). The top of the secondary filter housing (14) is detachably fitted with a secondary filter top cover (16) that presses the secondary filter element (15) into the secondary filter housing (14). The air outlet of the primary filter element (2) is connected to the air inlet of the secondary filter element (15).

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