CN110056457A - Air cleaner - Google Patents

Abstract

The invention discloses an air filter. A pre-filter assembly is located between a filter element and a dust-collecting cover assembly. Several swirl pipes of the pre-filter assembly are installed under the upper cover. The upper surface of the upper cover is Dust collecting surface with slope or arc, or stepped surface with high and low arrangement. The upper surface of the upper cover of the pre-filter assembly of the present invention is a dust collecting surface with an inclination or a radian, or a stepped surface arranged at high and low levels. The dust, sand and other pollutants falling on the upper surface are under the action of gravity. It can slide down the dust collection surface into the swirl pipe, and then collect from the swirl pipe into the dust collection cover assembly and discharge it from the dust discharge valve in time. The deposition of pollutants is avoided, the maintenance period of the present invention is prolonged, and the maintenance cost is reduced. The invention can make the dust and other pollutants gather and discharge better on the dust collecting surface through backflushing. The distance from the upper surface of the upper cover of the pre-filter assembly to the main filter element is shortened and uniform, which is conducive to the uniform distribution of the gas flow field to the surface of the filter element and achieves a better filtering effect.

Description

air filter

technical field

The invention relates to the field of air filters of an engine air intake system, in particular to an air filter.

Background technique

As the power source of vehicles and construction machinery, the performance of the air intake system directly affects the power output performance of the engine. The intake system of the engine is mainly composed of three components: pre-filter assembly, intake duct and air filter. The air filter is the core component of the engine air intake system. Its main function is to filter out dust, sand and other pollutants in the air to provide clean air for the engine.

Desert air filter is a general term for an air filter that integrates the pre-filter assembly of the intake system and the intake duct into one housing. Therefore, the desert air filter can be regularly used in vehicles in harsh environments such as mines, sand and gravel factories, and desert areas with very large dust concentrations. The working principle of the desert air filter is as follows: the air in the atmospheric environment is driven by the negative pressure of the engine to enter from the air inlet of the desert air filter, and passes through the pre-filter assembly in the housing for primary filtration. Dirty outdoor air containing dust and sand produces swirl in the swirl tube of the pre-filter assembly, and dust and sand with larger particle size and heavier weight are separated from the air; The clean air passes through the main filter element and the safety filter element inside the air filter for secondary filtration, and the dust with smaller particle size and lighter weight is intercepted by the filter element, and finally clean air is obtained. The clean air is discharged from its outlet and enters engine. With the continuous accumulation of working time, the number of pollutants filtered by the outer surface of the filter paper of the main filter element of the air filter continues to increase, and eventually the maximum resistance and dust holding capacity allowed by its design will be reached, that is, the service life of the filter element will be reached. The filter element needs to be replaced.

The existing desert air filter is shown in Figures 1 and 2. The main filter element 2, the pre-filter assembly 3 and the dust collection cover assembly 5 are arranged in the casing 1 in order from top to bottom. The upper part of the pre-filter assembly 3 The cover 31 is provided with a plurality of swirl tubes 32 arranged in an array. The upper surface of the upper cover 31 is a horizontal dust collecting surface 3100, and contaminants such as dust and sand falling on the horizontal dust collecting surface 3100 cannot be sufficiently transferred to the inside of the swirl pipe 32, and then discharged from the dust discharge valve 56 at the bottom. With the accumulation of working time, the pollutants deposited on the horizontal dust collecting surface 3100 increase continuously, and will be adsorbed on the outer surface of the closer main filter element 2 under the action of negative pressure, affecting the service life of the filter element and shortening the air filter. The maintenance cycle of the air filter increases the maintenance cost of the air filter. Since several swirling tubes 32 are arranged in an array at the same level, the horizontal dust collecting surface 3100 and the lower cover 34 are both horizontal planes, and the two planes have large areas. Under the action of the gravity of the swirling tubes 32, a larger Bending deformation, once the plane is deformed, there will be a gap between the plane and the swirl tube 32, which will affect the sealing between the upper cover 31, the lower cover 34 and the swirl tube 32, and the polluted air is prone to short-circuit and directly enter the main filter element 2 cavity chamber, reducing pre-filtration efficiency.

SUMMARY OF THE INVENTION

Aiming at the shortcomings of the above-mentioned horizontal dust collecting surface inside the existing desert air filter that cannot discharge dust in time, resulting in a short maintenance period of the filter element, the applicant provides an air filter with a reasonable structure, the upper cover of the pre-filter assembly The upper surface of the air filter is a dust collecting surface with a slope or radian or a stepped surface arranged in heights, which is conducive to timely dust removal and prolongs the maintenance cycle of the air filter.

The technical scheme adopted in the present invention is as follows:

An air filter, the pre-filter assembly is located between the filter element and the dust-collecting cover assembly, several swirl tubes of the pre-filter assembly are installed under the upper cover, and the upper surface of the upper cover is inclined or Arc dust collecting surface.

An air filter, the pre-filter assembly is located between the filter element and the dust-collecting cover assembly, a plurality of swirl tubes of the pre-filter assembly are installed under the upper cover, and the upper surface of the upper cover is a high-low arrangement of steps noodle.

As a further improvement of the above technical solution:

The cross section of the upper surface of the upper cover is V-shaped, inverted trapezoidal, arc-shaped, or a combination of the above shapes.

The upper surface of the upper cover is an inclined surface, a curved surface or a composite surface formed by splicing them.

The upper surface of the upper cover of the pre-filter assembly of the present invention is a dust collecting surface with an inclination or radian, or a stepped surface arranged at high and low levels; the dust collecting surface can be an inclined plane with a slope, a stepped surface or a concave curved surface , under the action of gravity, the dust, sand and other pollutants falling on the upper surface can slide down the dust collecting surface into the swirl tube, and then collect from the swirl tube into the dust collection cover assembly in time from the dust discharge valve discharge. The deposition of pollutants is avoided, the maintenance period of the present invention is prolonged, and the maintenance cost is reduced. The invention can make the dust and other pollutants gather and discharge better on the dust collecting surface through backflushing. The distance from the upper surface of the upper cover of the pre-filter assembly to the main filter element is shortened and uniform, which is conducive to the uniform distribution of the gas flow field to the surface of the filter element and achieves a better filtering effect. The upper cover adopts two inclined dust collecting surfaces to dispersely bear the gravity of the swirl tube, reduce the bending deformation of the upper surface of the upper cover, and ensure the sealing between the swirl tube and the upper cover.

The swirl tube sleeve is arranged on the lower cover, and the top surface of the lower cover substantially corresponds to the undulating shape of the upper cover in cross section.

The top surface of the lower cover is a stepped surface with multiple steps.

The lower cover of the pre-filter assembly adopts a undulating design corresponding to the upper cover, which reduces the space size of the pre-filter assembly, thereby reducing the overall space size of the entire product, which can meet the requirements of a small installation space and save energy at the same time. raw material cost. The section of the cover body of the dust collecting cover assembly is trapezoidal, and the stepped surface at the bottom of the lower cover matches the shape of the cover body. , improve the filtration efficiency, on the other hand, the lower cover is located in the cover body, the structure is compact, and the volume of the present invention is reduced.

The two sides of the cover body of the dust collecting cover assembly are provided with inclined dust discharge surfaces.

The top surface of the lower cover or the ash discharge surface of the cover body is an inclined surface, a curved surface or a composite surface formed by splicing them.

The dust discharge surface of the dust collecting cover assembly of the present invention is an inclined plane with an inclination angle, a stepped surface or a concave curved surface, which is conducive to the accumulation and discharge of dust, prolongs the maintenance cycle of the present invention, and reduces maintenance costs; Especially in back blowing, it has better dust discharge effect. The upper port of the dust discharge valve of the dust cover adopts a racetrack-shaped oval structure, with a large cross-sectional flow area, a large dust holding capacity, and a large amount of dust flowing in a unit time, which improves the dust discharge capacity and prolongs the maintenance cycle of the present invention. , reducing maintenance costs.

The inclination of the dust collecting surface having the inclination is 5 to 60 degrees.

The inclination angle of the tangent plane of any point on the curved surface of the dust collecting surface with radian is 0-90 degrees.

The upper surface of the upper cover and the top surface of the lower cover of the present invention are provided with inclined surfaces, stepped surfaces or curved surfaces, which improves the rigidity, avoids the defect that a single plane is prone to warping and cannot guarantee the flatness, and has better strength and sealing performance.

The beneficial effects of the present invention are as follows:

The upper surface of the upper cover of the pre-filter assembly of the present invention is a dust collecting surface with an inclination or radian, or a stepped surface arranged at high and low levels; the dust collecting surface can be an inclined plane with a slope, a stepped surface or a concave curved surface , under the action of gravity, the dust, sand and other pollutants falling on the upper surface can slide down the dust collecting surface into the swirl tube, and then collect from the swirl tube into the dust collection cover assembly in time from the dust discharge valve discharge. The deposition of pollutants is avoided, the maintenance period of the present invention is prolonged, and the maintenance cost is reduced. The invention can make the dust and other pollutants gather and discharge better on the dust collecting surface through backflushing. The distance from the upper surface of the upper cover of the pre-filter assembly to the main filter element is shortened and uniform, which is conducive to the uniform distribution of the gas flow field to the surface of the filter element and achieves a better filtering effect. The upper cover adopts two inclined dust collecting surfaces to dispersely bear the gravity of the swirl tube, reduce the bending deformation of the upper surface of the upper cover, and ensure the sealing between the swirl tube and the upper cover.

The lower cover of the pre-filter assembly adopts a undulating design corresponding to the upper cover, which reduces the space size of the pre-filter assembly, thereby reducing the overall space size of the entire product, which can meet the requirements of a small installation space and save energy at the same time. raw material cost. The section of the cover body of the dust collecting cover assembly is trapezoidal, and the stepped surface at the bottom of the lower cover matches the shape of the cover body. , improve the filtration efficiency, on the other hand, the lower cover is located in the cover body, the structure is compact, and the volume of the present invention is reduced.

The dust discharge surface of the dust collecting cover assembly of the present invention is an inclined plane with an inclination angle, a stepped surface or a concave curved surface, which is conducive to the accumulation and discharge of dust, prolongs the maintenance cycle of the present invention, and reduces maintenance costs; Especially in back blowing, it has better dust discharge effect. The upper port of the dust discharge valve of the dust cover adopts a racetrack-shaped oval structure, with a large cross-sectional flow area, a large dust holding capacity, and a large amount of dust flowing in a unit time, which improves the dust discharge capacity and prolongs the maintenance cycle of the present invention. , reducing maintenance costs.

The upper surface of the upper cover and the top surface of the lower cover of the present invention are provided with inclined surfaces, stepped surfaces or curved surfaces, which improves the rigidity, avoids the defect that a single plane is prone to warping and cannot guarantee the flatness, and has better strength and sealing performance.

Description of drawings

FIG. 1 is a perspective cross-sectional view of a conventional desert air filter.

FIG. 2 is an enlarged view of part H in FIG. 1 .

FIG. 3 is a perspective view of the present invention.

FIG. 4 is an exploded view of FIG. 3 .

FIG. 5 is a cross-sectional view of FIG. 3 .

FIG. 6 is a cross-sectional view taken along line A-A in FIG. 5 .

FIG. 7 is an enlarged view of part B in FIG. 5 .

FIG. 8 is an enlarged view of part C in FIG. 5 .

Figure 9 is an exploded view of the pre-filter assembly.

FIG. 10 is a top view of the upper cover.

FIG. 11 is a cross-sectional view of F-F in FIG. 10 .

FIG. 12 is an enlarged view of part D in FIG. 11 .

Fig. 13 is a front view of the swirl pipe.

FIG. 14 is an enlarged view of part E in FIG. 13 .

FIG. 15 is a top view of the lower cover.

FIG. 16 is a cross-sectional view along G-G in FIG. 15 .

Figure 17 is a perspective view of the dust cover assembly.

FIG. 18 is a cross-sectional view of FIG. 17 .

Fig. 19 is a perspective view of the dust discharge valve.

In the figure: 1. Shell; 2. Main filter element; 3. Pre-filter assembly; 31. Top cover; 3100, Horizontal dust collecting surface; 310, Flat bottom surface; 311, Dust collecting surface; 313, Hollow pipe; Flange; 315, guide positioning part one; 316, inner wall; 317, upside down one; 319, bottom surface; 32, swirl pipe; 321, swirl sheet; 323, limit boss; 324, upside down two; 325 , outer wall; 33, special-shaped sealing ring; 331, raised part one; 332, raised part two; 34, lower cover; 341, swirl tube sleeve; 342, installation groove; 344, reinforcing ribs; ; 346, outer edge; 349, guide positioning part two; 4, seal part one; 5, dust collection cover assembly; 51, cover body; 53, dust discharge surface; 55, dust discharge ejection pipe; 56, dust discharge Valve; 57, dust lip; 58, long groove; 6, outer end cover; 7, air inlet; 8, air outlet; 9, seal two; 10, safety filter element; 11, filter element cavity; 12, set Dust chamber; 13. Intake chamber; 14. Dust chamber; ɑ ₁ , ɑ ₂ : inclination angle.

Detailed ways

The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in Fig. 3 and Fig. 4, the present invention consists of a casing 1, a pre-filter assembly 3 and a dust collecting cover assembly 5 in order from top to bottom. One side of the casing 1 is provided with an air outlet 8, and the opposite side is provided with an air outlet 8. The outer end cover 6 is fixed by the buckle, and a sealing member 2 9 is arranged between the outer casing 1 and the outer end cover 6; the outer casing 1 and the outer end cover 6 are provided with a horizontal cylindrical main filter element 2. A concentric safety filter element 10 is provided inside, and a filter element cavity 11 inside the safety filter element 10 communicates with the air outlet 8 . The lower end of the casing 1 is fixed to the pre-filter assembly 3 by fasteners, and a special-shaped sealing ring 33 is arranged between the pre-filter assembly 3 and the casing 1; Air port 7. The lower end of the pre-filter assembly 3 is fixed to the dust collecting cover assembly 5 by means of a buckle, and a sealing member 1 4 is arranged between the two.

As shown in FIG. 5 , the pre-filter assembly 3 is located below the main filter element 2 , and the cavity space between the pre-filter assembly 3 and the outer surface of the main filter element 2 is the dust collection chamber 12 , the dust collection chamber 12 and the swirl pipe 32 connected to the upper port. The upper cover 31 of the pre-filter assembly 3 is placed above the lower cover 34 through the special-shaped sealing ring 33 , the upper surface of the upper cover 31 is provided with a hole and a hollow tube 313 extends downward, and the upper end of the swirl tube 32 is inserted into the In the empty pipe 313, a plurality of swirl pipes 32 arranged in an array are arranged in steps, so that the cross section of the pre-filter assembly 3 is approximately V-shaped; the cavity space between the outer wall of the swirl pipe 32, the upper cover 31 and the lower cover 34 It is the intake chamber 13 , and the intake chamber 13 communicates with the intake port 7 . As shown in FIGS. 9 and 10 , a vertical hollow tube 313 is provided inside the upper cover 31 corresponding to each swirl tube 32 , and a vertical swirl tube sleeve is integrated on the lower cover 34 corresponding to the swirl tube 32 341, the lower outer periphery of the swirl tube 32 is provided with a swirl sheet 321, the swirl sheet 321 can be integrated on the swirl pipe 32, and the swirl sheet 321 can also be manufactured independently, and is sleeved on the outer periphery of the swirl pipe 32 by assembling ; The lower part of the swirl tube 32 containing the swirl piece 321 is located in the swirl tube sleeve 341, and the swirl piece 321 is located at the mouth of the swirl tube sleeve 341. The inner diameter of the flow tube sleeve 341 is matched to ensure the coaxiality requirement between the outer wall of the swirl tube 32 and the inner wall of the swirl tube sleeve 341 . In this embodiment, the multiple swirl tube sleeves 341 and the lower cover 34 are integrally injection-molded, and each swirl tube 32 is integrally injection-molded with its outer peripheral swirl sheet 321, which not only eliminates the installation step of the swirl tube sleeve 341, Eliminate the installation gap, save the installation cost, and prevent the problem of dislocation or missing installation of the swirl sheet 321, ensure the concentricity and verticality requirements between the components, improve the sealing between the components, and further improve the pre-conditioning. Filtration efficiency. As shown in FIG. 11 , the center part of the upper cover 31 is provided with a guide positioning part 1 315 that protrudes downward. As shown in FIG. 16 , correspondingly, a guide positioning part 2 349 is installed on the center part of the lower cover 34 to protrude upward, as shown in FIG. 16 . As shown in Fig. 6, the upper cover 31 and the lower cover 34 cooperate with each other through the guide positioning part 1 315 and the guide positioning part 2 349 and are fixed by fasteners.

As shown in FIG. 5 , the upper surface of the upper cover 31 is an inverted trapezoid formed by two dust collecting surfaces 311 and a flat bottom surface 310 . In other embodiments, the upper surface of the upper cover 31 may also be V-shaped formed by two dust collecting surfaces 311 ; the upper surface of the upper cover 31 may also be a concave arc-shaped curved surface. As shown in FIG. 11 , the dust collecting surface 311 is an inclined plane having an inclination angle, the inclination angle of the dust collecting surface 311 is α ₁ , and the inclination angle α ₁ is 5 to 60 degrees, preferably 45 degrees. In other embodiments, the dust collecting surface 311 may be a multi-step stepped surface with two sides higher than the middle, and the inclination angle of each stepped surface is 5-60 degrees, preferably 45 degrees. The dust collecting surface 311 may also be a downward curved surface, and the inclination angle of the tangent plane at any point on the curved surface is 0 to 90 degrees. The dust collecting surface 311 may also be a composite surface combining any two or three of an inclined plane, a curved surface and a stepped surface. The two dust collecting surfaces 311 can be the same as any one of the surfaces described above or different surfaces. When the dust collecting surface 311 of the upper cover 31 is an inclined plane, a stepped surface or a downward curved surface, the contaminants such as dust and sand particles falling on the dust collecting surface 311 will fall down under the action of gravity and flow from the swirl tube 32 in time. discharge, avoid the deposition of pollutants on the dust collecting surface 311, avoid the influence of pollutants on the filter element, prolong the maintenance cycle of the filter element, and reduce the maintenance cost. As shown in FIG. 5 , the distance between the inverted trapezoidal upper surface of the upper cover 31 and the main filter element 2 is reduced, and the vertical distance corresponding to each point on the upper surface of the upper cover 31 and the outer surface of the main filter element 2 is similar, which is conducive to gas The flow field is evenly distributed between the dust collecting surface 311 and the main filter element 2, so that the air flow filtered on the surface of the filter element is uniform, and each part of the main filter element 2 is fully utilized to improve the utilization rate of the filter element. Of course, the upper cover 31 can also be a multi-step stepped surface with high sides and a low center, which is similar to the top surface shape of the lower cover 34 in FIG. 16 .

As shown in FIGS. 11 and 12 , the inner hole of the hollow tube 313 is an inner wall 316 and an inwardly protruding circle 317 in order from top to bottom, and the bottom surface 319 of the hollow tube 313 is a horizontal plane. As shown in FIG. 13 , the upper part of the swirl tube 32 is a cylindrical part, and the lower part is a conical part. As shown in FIG. 13 and FIG. 14 , the outer wall 325 of the upper end of the cylindrical portion of the swirl tube 32 protrudes outward with a circle of undercuts 324 , and a circle of limiters is set on the outer periphery of the swirl tube 32 located below the undercuts 324 . The top surface of the boss 323 and the limiting boss 323 is a horizontal plane; As shown in FIG. 13 , the swirl sheet 321 is a curved swirl sheet, and the angle between the tangent plane of the curved surface of the swirl sheet 321 and the horizontal line is 15-60 degrees, which ensures that the best air intake can be obtained without increasing the air intake resistance. Swirl effect; the small diameter end of the conical part is 0.5mm~5mm smaller than the large diameter end, which can not only play a guiding role when inserting the swirl tube sleeve 341, but also offset the molding and assembly tolerances of plastic parts while ensuring that The concentricity and verticality requirements between the swirl tube 32 and the swirl tube sleeve 341 improve the sealing between the components, thereby improving the pre-filtration efficiency.

As shown in FIG. 8 , the inverted first 317 of the hollow tube 313 and the inverted second 324 of the swirl tube 32 are arranged in a staggered height. The inversion two 324 of 32 is in interference fit with the inner wall 316 of the hollow tube 313, and the inversion one 317 of the hollow tube 313 is in interference fit with the outer cylindrical surface of the cylindrical portion of the swirl tube 32, which ensures that the swirling tube 32 and the upper The tightness between the covers 31 prevents gas leakage; the interlocking of the inverted button 1 317 and the inverted button 2 324 can ensure that each swirl tube 32 is installed in place, and prevent the swirl tube 32 from coming out of the hole of the hollow tube 313, Make the installation of the swirl pipe 32 firmer; the outer wall 325 of the swirl pipe 32 is matched with the inner wall 316 of the hollow pipe 313; , to achieve the limit in the vertical direction and prevent the swirl pipe 32 from being installed misaligned due to overpressure.

As shown in Fig. 5 and Fig. 7 , there is a mounting groove 342 on the outer peripheral flange of the upper end of the lower cover 34. The height of the inner edge 345 of the mounting groove 342 close to the interior of the filter is relatively low, and the height of the outer edge 346 is relatively high; the corresponding mounting groove At the position of 342 , a flange 314 protrudes outward from the outer circumference of the lower end of the upper cover 31 , and the lower end surface of the housing 1 contacts the flange 314 of the upper cover 31 and the outer edge 346 of the installation groove 342 . The special-shaped sealing ring 33 is placed in the installation groove 342, and the special-shaped sealing ring 33 has a special-shaped cross section. Raised part one 331; the upper end face of the raised part 2 332 is in pressing contact with the lower end face of the housing 1, and the lower end face of the housing 1 has a raised ring protruding downward, and the raised ring further squeezes the upper end face of the raised part 2 332; The upper end surface of the raised part 332 produces a certain elastic deformation, so as to realize the sealing in the up-down direction between the casing 1, the upper cover 31 and the lower cover 34; the inner peripheral surface of the raised part 331 is below the flange 314 of the upper cover 31 The outer peripheral wall surface of the convex part 1 331 is pressed and contacted, and the inner peripheral surface of the raised part 331 produces a certain elastic deformation, so as to realize the sealing in the horizontal direction between the outer casing 1 , the upper cover 31 and the lower cover 34 . The present invention realizes the two-to-two sealing between the upper cover 31 , the lower cover 34 and the surfaces of the casing 1 simultaneously through a special-shaped sealing ring 33 , which simplifies the structure, reduces the number of sealing components, reduces the production cost, and ensures that the components improve the airtightness and improve the pre-filtration efficiency at the same time.

As shown in FIG. 5 , FIG. 15 and FIG. 16 , the outer surfaces of the adjacent swirl tube sleeves 341 of the lower cover 34 are connected and strengthened by reinforcing ribs 344 , which ensure the lower cover 34 and the swirl tube sleeves 341 The overall strength improves the stability and reliability of the product. The cross section of the top surface of the lower cover 34 is in a shape with high sides and a low center, which basically corresponds to the undulating shape of the upper cover 31. The top surface of the lower cover 34 can be an inclined plane with an inclination angle, and the inclination angle is 5-60 degrees. is 45 degrees; it can also be a multi-step stepped surface (as shown in Figure 16), a downward curved surface, or a composite surface that is arbitrarily combined with an inclined plane, a stepped surface and a curved surface. The inclination of the tangent plane at any point on the curved surface is 0 to 90 degrees; the top surfaces on the left and right sides of the lower cover 34 may be any of the surfaces described above, or may be a combination of two different surfaces. The shape of the lower cover 34 is designed to be undulating according to the geometry of the upper cover 31, which can reduce the space size of the pre-filter assembly 3, thereby reducing the overall space size of the present invention and saving the cost of raw materials. As shown in FIG. 5 , since the swirling tube sleeve 341 is set in accordance with the height of the swirling tube 32 , the bottom of the lower cover 34 is also a stepped surface, and the cross section of the cover body 51 of the dust collecting cover The shape of the bottom of the cover 34 matches the shape of the cover body 51. On the one hand, the pollutants such as dust fall from the swirl tube sleeve 341 until it is discharged from the dust discharge valve 56. The distance is short, which improves the filtration efficiency. On the other hand, the lower cover 34 is just located in the cover body 51, the structure is compact, and the volume of the whole product is reduced. The cavity space between the lower cover 34 and the cover body 51 is the dust discharge cavity 14 , and the dust discharge cavity 14 communicates with the lower port of the swirl pipe 32 through the swirl pipe sleeve 341 .

As shown in Fig. 17 and Fig. 18 , a dust discharge ejection pipe 55 is arranged at the inner bottom of the cover body 51 of the dust collecting cover assembly 5, and the end of the dust discharge ejection pipe 55 located outside the cover body 51 can be externally ejected air flow, It is used for efficient dust discharge; the outside of the cover body 51 is located below the dust discharge ejection pipe 55 and a long strip of dust discharge valve 56 is fixed. The dust discharge valve 56 and the cover body 51 can also adopt an integral molding structure. Installation costs are reduced, assembly work is reduced, installation gaps between components are avoided, and sealing is improved, thereby ensuring pre-filtration efficiency in the system. As shown in Figure 18, the inner surface of the cover body 51 is provided with a symmetrical ash discharge surface 53, the ash discharge surface 53 is an inclined plane with an inclination angle, the inclination angle of the ash discharge surface 53 is ɑ ₂ , and the inclination angle ɑ ₂ is 5-60 degrees, Preferably 45 degrees. In other embodiments, the ash discharge surface 53 may be a multi-step stepped surface, a downward curved surface, or a composite surface arbitrarily combined by an inclined plane, a stepped surface and a curved surface, and the inclination of the tangent plane at any point on the curved surface is 0~ 90 degrees; the two ash discharge surfaces 53 can be the same as any of the surfaces described above, or can be a combination of two different surfaces. The dust discharge surface 53 of the dust collecting cover is set as an inclined plane, a stepped surface, and a downward curved surface with a large inclination angle. The dust, sand and other pollutants falling on the dust discharge surface 53 slide down in time under the action of gravity. Timely discharge to avoid the deposition of pollutants.

As shown in FIGS. 18 and 19 , an oval long groove 58 is opened in the dust discharge valve 56 , and the cross section of the long groove 58 is triangular. In other embodiments, the cross section of the long groove 58 can also be U-shaped. Or arc-shaped; the bottom of the long groove 58 is open and is provided with two vertical and parallel long strip-shaped dust removal lips 57, and the dust removal lips 57 are made of rubber, thermoplastic elastomer flexible material; two dust removal lips There is a certain gap between 57, the gap value is about 0.5mm ~ 2mm, when there is negative pressure inside the air filter, under the action of negative pressure, the two dust discharge lips 57 will close and close to realize the protection of the internal system. seal. The upper port of the long groove 58 is in the shape of a racetrack, and the dimension in the length direction is 1.5 to 50 times the dimension in the width direction. The upper port of the long groove 58 has a large flow area and a large dust holding capacity. Ash discharge capacity. The length of the dust discharge lip 57 is greater than the length of the opening of the long groove 58, and the two outer ends of the dust discharge lip 57 extend outward for a certain length along the length of the long groove 58, so as to ensure that the dust discharge lip 57 is opposite to the long groove 58. The end is sealed, the length of the dust lip 57 is longer, and the opening of the dust lip 57 is larger when it is opened, which improves the dust discharge capacity; the height of the dust lip 57 is 5mm to 50mm, and the The thickness of the two lips is 0.5mm to 5mm. The dust discharge lip 57 has a large height and a relatively thin thickness, which can make the dust discharge lip 57 close more tightly and improve the stability and reliability of the internal system seal.

When the present invention works, the air inlet 7 is connected with the high-level air bleed pipeline or other pipelines, and the air outlet 8 is connected with the engine air intake pipeline. The dust discharge lip 57 is in close contact, so that the interior of the filter system of the present invention is in a hermetic state. As shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, the externally polluted air containing various particle sizes and types of dust pollutants is introduced into the air inlet 7 of the present invention through the air bleed pipeline, and enters from the air inlet 7 Inside the pre-filter assembly 3, the air first enters the air intake cavity 13 between the outer wall of each swirl tube 32, the upper cover 31 and the lower cover 34, and under the action of the internal negative pressure, the air fluid enters the swirl tube downward. In the sleeve 341 and through the area of the swirl sheet 321, the cyclone is generated by high-speed rotation under the diversion of the swirl sheet 321, and the dust pollutants with larger particle size and heavier mass in the air fluid are concentrated to the cyclone under the action of centrifugal force. On the inner circumferential surface of the flow tube sleeve 341, since the fluid velocity at the wall boundary of the inner circumferential surface approaches zero, the dust pollutants with larger particle size and heavier weight near the wall surface are separated and slipped off under the action of gravity. After the pre-filter assembly 3 separates the dust pollutants with larger particle size and heavier mass, a relatively clean pre-filtered air fluid is obtained, and the pre-filtered air fluid turns upward from the opening at the bottom end of the swirl pipe 32 and enters the swirl pipe 32, From the opening at the upper end of the swirl tube 32, it flows into the dust collection chamber 12, reaches the outer surface of the main filter element 2, and then passes through the main filter element 2 and the safety filter element 10 and enters the filter element chamber 11. The dust pollutants with smaller particle size and lighter weight It is further filtered by the main filter element 2 to finally obtain clean air that meets the cleanliness requirements of the engine. The clean air passes through the safety filter element 10 and enters the engine intake pipe through the air outlet 8 .

The dust pollutants with larger particle size and heavier mass that are separated and slipped in the swirl tube sleeve 341 are discharged from the lower part of the swirl tube sleeve 341 into the dust chamber 14 and fall to the dust collection cover assembly 5 Since the ash discharge surface 53 is an inclined surface, the dust pollutants falling on the ash discharge surface 53 fall into the dust discharge valve 56 under the action of gravity. When the dust pollutants in the dust discharge valve 56 are deposited to a certain amount, the dust discharge lip 57 is opened under the action of the gravity of the dust pollutants, and the dust discharge lip 57 is discharged from the opening of the dust discharge lip 57 . The dust discharge ejection pipe 55 is connected to the ejection fan. When the amount of dust deposited in the dust discharge valve 56 reaches a certain amount and cannot be discharged in time, the ejection fan can be turned on to discharge the dust. The pressure of the injection pipe 55 is equal to the pressure in the dust cover assembly 5 .

The present invention is also applicable to a backflushing system. When the present invention is applied to a backflushing system, the air outlet 8 is connected to a three-way pipeline, one interface of the three-way pipeline is connected to the engine intake pipeline, and the other interface is connected to the backflushing system. When the backflushing system is running, the backflushing system blows clean compressed air into the filter element cavity 11 inside the safety filter element 10 from the air outlet 8, and the compressed air passes through the safety filter element 10 and the main filter element 2, and will deposit on the outer surface of the main filter element 2. The dust pollutants are stripped to the dust collection chamber 12; under the combined action of gravity and the compressed air fluid, a part of the dust pollutants in the dust collection chamber 12 flows directly from the swirl pipe 32 to the dust discharge valve 56 along with the compressed air fluid. In the dust chamber 14, the other part falls on the dust collecting surface 311 of the upper cover 31 of the pre-filter assembly 3. Since the dust collecting surface 311 has an inclination, the dust pollutants descend along the inclined surface under the action of gravity and gather to the dust collecting surface 311. The swirl pipe 32 flows out from the swirl pipe 32 into the dust discharge chamber 14 of the dust discharge valve 56 . Under the pressure of the compressed air, the dust discharge lip 57 of the dust discharge valve 56 is opened, and most of the dust pollutants in the dust discharge chamber 14 of the dust discharge valve 56 are directly discharged from the dust discharge lip 57; A part of the dust pollutants in 14 falls on the dust discharge surface 53, and under the action of gravity, slides down along the dust discharge surface and is discharged from the dust discharge lip 57.

In the present invention, the dust collecting surface 311 of the upper cover 31 of the pre-filter assembly 3 and the dust discharging surface 53 of the cover body 51 of the dust collecting cover assembly 5 are inclined planes with inclined angles, stepped inclined planes or downward curved surfaces, which fall on the Under the action of gravity, the above pollutants such as dust and sand can slide down into the swirl pipe 32, and then enter the dust collection cover assembly 5, and be discharged from the dust discharge valve 56 in time. The pollutants are discharged in time, the deposition of pollutants is avoided, the maintenance period of the present invention is prolonged, and the maintenance cost is reduced.

The above description is an explanation of the present invention, not a limitation of the present invention. The present invention may be modified in any form without departing from the spirit of the present invention. For example, on the dust collecting surface 311 , a small conical dust collecting surface is further provided at the upper end of the hollow tube 313 , so that the dust can more easily fall into the swirl tube 32 . The upper surface of the upper cover 31, the top surface of the lower cover 34 or the ash discharge surface 53 of the cover body 51 are high on both sides and low in the middle. When the air cleaner contains two side-by-side filter elements, the upper surface of the upper cover 31 is "W" shaped, and each V-shaped surface corresponds to a filter element; when the air cleaner contains more than two filter elements, The upper surface of the upper cover 31 is in the zigzag shape of "VV...V", and each V-shaped surface corresponds to a filter element.

Claims (10)

1. An air filter, the pre-filter assembly (3) is located between the filter element and the dust collection cover assembly (5), characterized in that: a plurality of swirl tubes ( 32) It is installed under the upper cover (31), and the upper surface of the upper cover (31) is a dust collecting surface (311) with a slope or arc. 2. An air filter, the pre-filter assembly (3) is located between the filter element and the dust collection cover assembly (5), characterized in that: a plurality of swirl tubes ( 32) It is installed under the upper cover (31), and the upper surface of the upper cover (31) is a stepped surface arranged at high and low levels. 3. The air cleaner according to claim 1, characterized in that: the cross section of the upper surface of the upper cover (31) is V-shaped, inverted trapezoidal, arc-shaped, or a combination of the above shapes. 4 . The air cleaner according to claim 1 , wherein the upper surface of the upper cover ( 31 ) is an inclined surface, a curved surface or a composite surface formed by splicing the same. 5 . 5. The air cleaner according to claim 1 or 2, characterized in that: the swirl tube sleeve (341) is arranged on the lower cover (34), and the top surface of the lower cover (34) is in cross section with the upper The undulating shape of the cover (31) corresponds substantially. 6 . The air cleaner according to claim 5 , wherein the top surface of the lower cover ( 34 ) is a multi-step stepped surface. 7 . 7 . The air cleaner according to claim 1 or 2 , characterized in that: two sides of the cover body ( 51 ) of the dust collecting cover assembly ( 5 ) are provided with inclined dust discharge surfaces ( 53 ). 8 . 8. The air cleaner according to claim 1 or 2, characterized in that: the top surface of the lower cover (34) or the ash discharge surface (53) of the cover body (51) is an inclined surface, a curved surface, or a spliced surface thereof. formed composite surface. 9 . The air cleaner according to claim 1 , wherein the inclination of the dust collecting surface ( 311 ) having an inclination is 5 to 60 degrees. 10 . 10 . The air cleaner according to claim 1 , wherein the inclination angle of the tangent plane at any point on the curved surface of the dust collecting surface ( 311 ) having an arc is 0 to 90 degrees. 11 .