CN216198544U

CN216198544U - Combined type air cleaner for diesel engine

Info

Publication number: CN216198544U
Application number: CN202121731193.XU
Authority: CN
Inventors: 张洪宝
Original assignee: Shandong Haoweide Electric Power Technology Co ltd
Current assignee: Shandong Haoweide Electric Power Technology Co ltd
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2022-04-05
Anticipated expiration: 2031-07-28

Abstract

The utility model provides a composite air filter for a diesel engine, which comprises a rotational flow rough filtering component and a fine filtering component; the rotational flow rough filtering component comprises a lower shell and a rotational flow pipe assembly embedded in the lower shell, the upper end and the lower end of the filter element are both provided with a damping device, one side of the lower shell is provided with a first air inlet, the upper end and the lower end of the lower shell are respectively provided with a connecting end cover and a dust collection cover, and the connecting end cover is provided with a first air outlet; the fine filtering component comprises an upper shell, a filter element and a sealing cover, wherein a core pipe is arranged in the middle of the upper shell, the filter element is sleeved on the outer side of the core pipe, a second air inlet connected with a first air outlet is formed in the lower end of the core pipe, the sealing cover is fastened on the outer side of the upper shell, and a second air outlet is formed in one side of the sealing cover. The direct gomphosis of spiral-flow tube subassembly is in the inside of casing down, easy dismounting, and spiral-flow tube subassembly sets up along vertical direction, and the dust is gathering more easily in the dust cage under the effect of gravity and centrifugal force.

Description

Combined type air cleaner for diesel engine

Technical Field

The utility model belongs to the technical field of air filters, and particularly relates to a combined type air filter for a diesel engine.

Background

When the diesel engine is in operation, a large amount of air needs to be sucked, and if the air is not filtered, dust suspended in the air is sucked into the cylinder, so that the abrasion of the piston group and the cylinder is accelerated. Larger particles enter between the piston and the cylinder, causing severe "scuffing" phenomena, which is particularly severe in dry, sandy working environments. The air filter is arranged in front of the carburetor or the air inlet pipe, plays a role in filtering dust and sand grains in air and ensures that sufficient and clean air enters the air cylinder.

The existing air filter mostly adopts a paper dry-type filter element, the filter element has certain mechanical strength and water resistance, and has the advantages of high filtering efficiency, simple structure, light weight, low cost, convenient maintenance and the like, and the filter element has the defects of short service life and unreliable work under severe environmental conditions. Because the diesel engine can produce high frequency vibrations at the during operation, the sealing connection of filter core can produce the gap under long-time vibrations, leads to the filter effect to discount greatly. In order to further promote the filter effect, some filters adopt the combined type filtering method of assembling filter core and cyclone tube together, but this kind of cyclone tube is mostly the level and places, and the installation is inconvenient, still causes easily to arrange the ash unsmooth.

Therefore, how to avoid the problems of unsmooth dust discharge and inconvenient installation of the air filter on the basis of ensuring high-efficiency filtering efficiency becomes an important technical problem to be solved by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide a composite air filter for a diesel engine, which aims to solve the problems of easiness in loosening of a filter element, unsmooth ash discharge and inconvenience in installation.

In order to achieve the purpose, the technical scheme of the utility model is realized as follows:

a composite air cleaner for a diesel engine, comprising: the cyclone rough filtering component comprises a lower shell and a cyclone tube assembly arranged in the lower shell, wherein the inner cavity of the lower shell is sequentially divided into an air outlet cavity, an air inlet cavity and a dust removing cavity from top to bottom, the air outlet cavity is communicated with the air outlet end of the cyclone tube assembly, the air inlet cavity is communicated with the air inlet end of the cyclone tube assembly, the dust removing cavity is communicated with the dust removing end of the cyclone tube assembly, a first air inlet communicated with the air inlet cavity is formed in one side of the lower shell, a connecting end cover and a dust collecting cover used for sealing are respectively arranged at the upper end and the lower end of the lower shell, and a first air outlet communicated with the air outlet cavity is formed in the middle position of the connecting end cover; the fine filtration component comprises an upper shell, a filter element and a sealing cover, wherein a hollow core pipe is arranged at the middle position of the upper shell, the filter element sleeve is arranged on the outer side of the core pipe, a fine filtration cavity is formed between the inner side wall of the upper shell and the outer side wall of the core pipe, the lower end of the core pipe penetrates through the bottom of the upper shell and then continues to extend to form a second air inlet corresponding to the first air outlet, the sealing cover is fastened on the outer side of the upper shell, a relatively closed exhaust cavity is formed between the inner wall of the sealing cover and the outer wall of the upper shell, a plurality of groups of through holes are formed in the pipe wall of the core pipe, a plurality of groups of strip holes are formed in the side wall of the upper shell, and a second air outlet communicated with the exhaust cavity is formed in one side of the sealing cover.

As a preferred technical scheme, the cyclone tube assembly is composed of a lower assembly and an upper assembly sleeved inside the lower assembly, the lower shell is in a step shape, an upper step of transition is arranged at the junction of the air outlet chamber and the air inlet chamber, the upper assembly is in lap joint with the upper step, a lower step of transition is arranged at the junction of the air inlet chamber and the dust removal chamber, and the lower assembly is in lap joint with the lower step.

As a preferred technical scheme, the upper assembly comprises an upper circular plate, the end face of the upper circular plate abuts against the end face of the upper step, the bottom of the upper circular plate is provided with a plurality of groups of upper hollow pipes communicated with the end faces of the upper circular plate, the upper hollow pipes are uniformly distributed in a surrounding manner along the circumferential direction by taking the central axis of the upper circular plate as the center, the middle position of the bottom of the upper circular plate is also provided with the upper hollow pipes communicated with the end faces of the upper circular plate, the lower end of the outer wall of the upper hollow pipe is provided with a plurality of groups of spiral blades, and the spiral blades are uniformly distributed in a surrounding manner along the circumferential direction by taking the central axis of the upper hollow pipe as the center; the lower assembly comprises a lower circular plate, the end face of the lower circular plate abuts against the end face of the lower step, a plurality of groups of lower hollow pipes which are communicated with the end faces of the lower circular plate and correspond to the upper hollow pipes one to one are arranged at the bottom of the lower circular plate, the upper end of each lower hollow pipe is sleeved on the outer side of each spiral blade, and the lower end of each lower hollow pipe gradually shrinks and narrows towards the direction of the central axis of the lower hollow pipe to form a conical cover.

As a preferred technical scheme, a first supporting shaft sleeve is arranged inside the air inlet chamber, two ends of the first supporting shaft sleeve are respectively abutted against the lower circular plate and the upper circular plate, and the side wall of the first supporting shaft sleeve is provided with a plurality of groups of air holes communicated with the air inlet chamber; the utility model discloses a gas outlet cavity, including gas outlet cavity, first support shaft sleeve, first overlap edge, filter screen, second support shaft sleeve, the inside of gas outlet cavity is equipped with amortization sponge layer, filter screen and second support shaft sleeve, the inside radiation of partial inner wall of second support shaft sleeve extends and forms first overlap edge, the filter screen is attached to the bottom of connecting the end cover, amortization sponge layer presss from both sides between filter screen and first overlap edge, the both ends of second support shaft sleeve offset with filter screen and upper plectane respectively.

As a preferred technical scheme, the upper end and the lower end of the filter element are respectively provided with a damping device.

As a preferred technical scheme, the damping device comprises an annular pressure plate sleeved outside the core tube, one end of the annular pressure plate abuts against the end of the filter element, the other end of the annular pressure plate is provided with two groups of first clamping grooves which are concentrically distributed, the bottom of the sealing cover and the bottom of the upper shell are both provided with second clamping grooves corresponding to the first clamping grooves, and springs which are extruded and abutted are arranged between the first clamping grooves and the second clamping grooves.

As a preferred technical scheme, the dust hood is connected with the lower housing through a plurality of sets of lower latches distributed in a surrounding manner, a dust exhaust valve is arranged at the bottom of the dust hood, latch bodies of the lower latches are fixedly mounted at the lower end of the lower housing, latch hooks of the lower latches are fixedly mounted at the upper end of the dust hood, the connecting end cover is connected with the lower housing through a plurality of sets of upper latches distributed in a surrounding manner, latch bodies of the upper latches are fixedly mounted at the upper end of the lower housing, and latch hooks of the upper latches are fixedly mounted at the lower end of the connecting end cover.

As a preferred technical scheme, the lower extreme of sealed lid is equipped with the second overlap edge that the external radiation extends, the outer wall of going up the casing is equipped with the third overlap edge corresponding with the second overlap edge, third overlap edge and second overlap edge adopt bolted connection, the upper end of going up the casing is equipped with the fourth overlap edge that the internal radiation extends, the fourth overlap edge offsets with the bottom of sealed lid.

As a preferred technical scheme, rubber sealing gaskets are arranged between the second overlapping edge and the third overlapping edge and between the fourth overlapping edge and the sealing cover.

After the technical scheme is adopted, the utility model has the beneficial effects that:

1. the upper end and the lower end of the filter element are respectively provided with a damping device which is dominant to the spring, the vibration generated when the diesel engine works is buffered and absorbed by the spring as elastic potential energy, and after the energy is released, the spring in the damping device firmly supports the filter element all the time, so that the looseness of the filter element is avoided, and the filtering effect is ensured.

2. The direct gomphosis of spiral-flow tube subassembly is in the inside of casing down, easy dismounting, and spiral-flow tube subassembly sets up along vertical direction, and the dust is gathering more easily in the dust cage under the effect of gravity and centrifugal force, and the dust cage is equipped with the dust exhaust valve of convenient dust exhaust.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of a cyclone coarse filtration part.

Fig. 3 is a schematic structural diagram of the fine filter member.

Fig. 4 is an enlarged schematic view of a portion a in fig. 3.

FIG. 5 is a schematic structural view of a cyclone tube assembly.

In the figure: 1. a first air inlet, 2, a lower shell, 3, a cyclone tube component, 4, a dust exhaust valve, 5, a dust collection cover, 6, a lower lock catch, 7, a silencing sponge layer, 8, an upper lock catch, 9, a connecting end cover, 10, a first air outlet, 11, an upper shell, 12, a core tube, 13, a filter element, 14, a sealing cover, 15, a second air outlet, 16, an air outlet cavity, 17, an air inlet cavity, 18, a dust removing cavity, 19, a lower circular plate, 20, an upper circular plate, 21, a lower step, 22, an upper step, 23, a first supporting shaft sleeve, 24, an air hole, 25, a filter screen, 26, a second supporting shaft sleeve, 27, a first overlapping edge, 28, a second overlapping edge, 29, a third overlapping edge, 30, a second air inlet, 31, a strip hole, 32, a fourth overlapping edge, 33, an annular pressure plate, 34, a first clamping groove, 35, a second clamping groove, 36, a spring, 37, a through hole, 38, An upper hollow pipe 39, a spiral blade 40, a lower hollow pipe 41 and a conical cover.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not to be construed as limiting the utility model. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.

The following description is given with reference to the orientation words as shown in the drawings, and is not intended to limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as either a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

Referring to fig. 1 to 4, an embodiment of the present invention illustrates a composite air filter for a diesel engine, including a cyclone rough filtering component and a fine filtering component, where the fine filtering component is located above the cyclone rough filtering component, and the composite air filter can solve the problems of easy looseness, unsmooth dust discharge, and inconvenient installation of a filter element of the air filter on the basis of ensuring high filtering efficiency.

Referring to fig. 2 and 4, the cyclone coarse filter element of the air cleaner includes a lower housing 2 and a cyclone tube assembly 3 embedded in the lower housing 2. The inner cavity of the lower shell 2 is sequentially divided into an air outlet cavity 16, an air inlet cavity 17 and a dust removing cavity 18 from top to bottom, the lower shell 2 is in a step shape, an upper transition step 22 is arranged at the junction of the air outlet cavity 16 and the air inlet cavity 17, and a lower transition step 21 is arranged at the junction of the air inlet cavity 17 and the dust removing cavity 18. Swirl tube subassembly 3 comprises lower subassembly and cup joints the upper subassembly of lower subassembly inside, and upper subassembly is located upper step 22 department overlap joint installation, and lower subassembly is located lower step 21 department overlap joint installation, and the lower extreme of lower subassembly is swirl tube subassembly 3's dust removal end, and upper subassembly upper end is the end of giving vent to anger of swirl tube subassembly 3, and the lower subassembly is located the air inlet end of swirl tube subassembly 3 with cup jointing of upper subassembly. The air outlet cavity 16 is communicated with the air outlet end of the cyclone tube component 3, the air inlet cavity 17 is communicated with the air inlet end of the cyclone tube component 3, the dust removing cavity 18 is communicated with the dust removing end of the cyclone tube component 3, one side of the lower shell 2 is provided with a first air inlet 1 communicated with the air inlet cavity 17, the upper end of the lower shell 2 is connected with a connecting end cover 9 used for sealing the port of the air outlet cavity 16, the lower end of the lower shell 2 is connected with a dust collection cover 5 used for sealing the port of the dust removing cavity 16, the bottom of the dust collection cover 5 is provided with a dust exhaust valve 4, and the middle position of the connecting end cover 9 is provided with a first air outlet 10 communicated with the air outlet cavity 16. The inside of spiral-flow tube assembly 3 direct gomphosis casing 2 under, easy dismounting, spiral-flow tube assembly 3 sets up along vertical direction, and the dust is gathering more easily in dust cage 5 under the effect of gravity and centrifugal force, and dust exhausting valve 4 that the dust cage was equipped with can in time clear up the dust of accumulation.

Referring to fig. 2, the dust hood 5 is connected to the lower housing 2 through a plurality of sets of lower latches 6 distributed around the lower housing, the latch bodies of the lower latches 6 are fixedly mounted to the lower end of the lower housing 2, and the latch hooks of the lower latches 6 are fixedly mounted to the upper end of the dust hood 5. Connecting end cover 9 is connected the installation with casing 2 down through the upper hasp 8 that the multiunit encircleed the distribution, and the hasp main part fixed mounting of upper hasp 8 is in the upper end of casing 2 down, and the latch hook fixed mounting of upper hasp 8 is in the lower extreme of connecting end cover 9. The connecting and mounting mode of the lock catch can meet the requirement of quick disassembly and assembly, and the bolt is not needed for fixing, so that the operation is convenient and fast.

Referring to fig. 2 and 4, the upper assembly includes an upper circular plate 20, an end surface of the upper circular plate 20 is mounted against an end surface of an upper step 22, the lower assembly includes a lower circular plate 19, and an end surface of the lower circular plate 19 is mounted against an end surface of a lower step 21. The bottom of the upper circular plate 20 is provided with a plurality of groups of upper hollow pipes 38 communicated with the end faces of the upper circular plate, the upper hollow pipes 38 are uniformly distributed around the central axis of the upper circular plate 20 in the circumferential direction, the middle position of the bottom of the upper circular plate 20 is also provided with the upper hollow pipes 38 communicated with the end faces of the upper circular plate, the lower end of the outer wall of each upper hollow pipe 38 is provided with a plurality of groups of spiral blades 39, and the spiral blades 39 are uniformly distributed around the central axis of the upper hollow pipe 38 in the circumferential direction. The bottom of the lower circular plate 19 is provided with a plurality of groups of lower hollow pipes 40 which are communicated with the end surfaces of the lower circular plate and correspond to the upper hollow pipes 38 one by one, the upper ends of the lower hollow pipes 40 are sleeved outside the spiral blades 39, and the lower ends of the lower hollow pipes 40 gradually shrink to narrow towards the direction of the central axis thereof to form a conical cover 41. The outer wall of the upper hollow pipe 38 and the inner wall of the lower hollow pipe 40 form a spiral air inlet channel with a plurality of groups of spiral blades 39, large granular substances in the air rotate in the air inlet channel, and the large granular substances are thrown to the conical cover 41 under the action of centrifugal force and gravity.

Referring to fig. 2, in order to ensure the reliability of the upper module and the lower module and avoid loosening and falling off, a first supporting shaft sleeve 23 is arranged inside the air inlet chamber 17, and a second supporting shaft sleeve 26 is arranged inside the air outlet chamber 16. The two ends of the first supporting shaft sleeve 23 are respectively abutted against the lower circular plate 19 and the upper circular plate 20, and the side wall of the first supporting shaft sleeve 23 is provided with a plurality of groups of air holes 24 communicated with the air inlet chamber 17. The inside of air outlet chamber 16 still is equipped with amortization sponge layer 7 and filter screen 25, and the inside radiation of part inner wall of second support shaft sleeve 26 extends and forms first overlap edge 27, and filter screen 25 is attached to the bottom of connecting end cover 9, and amortization sponge layer 7 presss from both sides between filter screen 25 and first overlap edge 27, and the both ends of second support shaft sleeve 26 offset with filter screen 25 and upper circular plate 20 respectively.

Referring to fig. 3 and 4, the fine filter element of the air cleaner includes an upper housing 11, a filter element 13, and a sealing cover 14. A hollow core tube 12 is arranged in the middle of the upper shell 11, the filter element 13 is sleeved on the outer side of the core tube 12, a fine filter cavity is formed between the inner side wall of the upper shell 11 and the outer side wall of the core tube 12, and the lower end of the core tube 12 passes through the bottom of the upper shell 11 and then extends continuously to form a second air inlet 30 corresponding to the first air outlet 10. The sealing cover 14 is fastened on the outer side of the upper shell 11, a relatively closed exhaust cavity is formed between the inner wall of the sealing cover 14 and the outer wall of the upper shell 11, a plurality of groups of through holes 37 are formed in the tube wall of the core tube 12, a plurality of groups of strip holes 31 are formed in the side wall of the upper shell 11, and a second air outlet 15 communicated with the exhaust cavity is formed in one side of the sealing cover 14. In order to avoid the filter element 13 from loosening, the upper end and the lower end of the filter element 13 are respectively provided with a damping device. The damping device comprises an annular pressing plate 33 sleeved outside the core tube 12, one end of the annular pressing plate 33 abuts against the end of the filter element 13, two groups of first clamping grooves 34 which are concentrically distributed are formed in the other end of the annular pressing plate 33, second clamping grooves 35 corresponding to the first clamping grooves 34 are formed in the bottom of the sealing cover 14 and the bottom of the upper shell 11, and springs 36 which are extruded and abutted are arranged between the first clamping grooves 34 and the second clamping grooves 35. The upper end and the lower end of the filter element 13 are respectively provided with a damping device which is dominant to the spring 36, the vibration generated when the diesel engine works is buffered and absorbed by the spring 36 as elastic potential energy, and after the energy is released, the spring 36 in the damping device always firmly supports the filter element 13, so that the looseness of the filter element 13 is avoided, and the filtering effect is ensured. The lower extreme of sealed lid 14 is equipped with the second overlap edge 28 that the external radiation extends, and the outer wall of going up casing 11 is equipped with the third overlap edge 29 corresponding with second overlap edge 28, and third overlap edge 29 adopts bolted connection with second overlap edge 28, and the upper end of going up casing 11 is equipped with the fourth overlap edge 32 that the internal radiation extends, and fourth overlap edge 32 offsets with the bottom of sealed lid 14. Rubber sealing gaskets are arranged between the second overlapping edge 28 and the third overlapping edge 29 and between the fourth overlapping edge 32 and the sealing cover 14, so that the sealing effect is greatly improved by the rubber sealing gaskets, and the filtering effect is ensured.

When the air cleaner during operation, the air gets into down casing 2's air inlet chamber 17 from first air inlet 1 under the suction of diesel engine, air admission whirl pipe assembly 3 in the air inlet chamber 17, because whirl pipe assembly 3 has countercurrent structure, the air that gets into along the downward direction can be at whirl pipe assembly 3 adversion and upwards discharge, the air that is discharged by whirl pipe assembly 3 filters behind the amortization through amortization sponge layer 7 and discharges from first gas outlet 10, in-process, the large granule material in the air is thrown into in dust cage 5 under the effect of centrifugal force and gravity, prefilter's air gets into second air inlet 30 by first gas outlet 10, prefilter's air passes through-hole 37 entering filter core 13 and carries out secondary filter, final clean air passes through second gas outlet 15 and gets into in the engine.

In accordance with the above embodiments of the utility model, these embodiments are not exhaustive and do not limit the utility model to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best utilize the utility model and various embodiments with various modifications as are suited to the particular use contemplated. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite air cleaner for a diesel engine, comprising:

a rotational flow rough filtering part which comprises a lower shell (2) and a rotational flow pipe component (3) arranged in the lower shell (2), the inner cavity of the lower shell (2) is divided into an air outlet chamber (16), an air inlet chamber (17) and a dust removing chamber (18) from top to bottom in sequence, the air outlet chamber (16) is communicated with the air outlet end of the cyclone tube component (3), the air inlet chamber (17) is communicated with the air inlet end of the cyclone tube component (3), the dust removing chamber (18) is communicated with the dust removing end of the cyclone tube component (3), one side of the lower shell (2) is provided with a first air inlet (1) communicated with an air inlet chamber (17), the upper end and the lower end of the lower shell (2) are respectively provided with a connecting end cover (9) and a dust collecting cover (5) for sealing, a first air outlet (10) communicated with the air outlet chamber (16) is formed in the middle of the connecting end cover (9);

the fine filtration component comprises an upper shell (11), a filter element (13) and a sealing cover (14), wherein a hollow core pipe (12) is arranged at the middle position of the upper shell (11), the filter element (13) is sleeved on the outer side of the core pipe (12), a fine filtration cavity is formed between the inner side wall of the upper shell (11) and the outer side wall of the core pipe (12), the lower end of the core pipe (12) penetrates through the bottom of the upper shell (11) and then continues to extend to form a second air inlet (30) corresponding to the first air outlet (10), the sealing cover (14) is buckled on the outer side of the upper shell (11), a relatively closed exhaust cavity is formed between the inner wall of the sealing cover (14) and the outer wall of the upper shell (11), a plurality of groups of through holes (37) are formed in the pipe wall of the core pipe (12), a plurality of groups of long holes (31) are formed in the side wall of the upper shell (11), and a second air outlet (15) communicated with the exhaust cavity is formed in one side of the sealing cover (14).

2. The composite air cleaner as claimed in claim 1, wherein: the cyclone tube component (3) is composed of a lower component and an upper component sleeved inside the lower component, the lower shell (2) is in a step shape, an upper step (22) for transition is arranged at the junction of the air outlet chamber (16) and the air inlet chamber (17), the upper component and the upper step (22) are installed in a lap joint mode, a lower step (21) for transition is arranged at the junction of the air inlet chamber (17) and the dust removal chamber (18), and the lower component and the lower step (21) are installed in a lap joint mode.

3. The composite air cleaner as claimed in claim 2, wherein: the upper assembly comprises an upper circular plate (20), the end face of the upper circular plate (20) is abutted against the end face of an upper step (22), a plurality of groups of upper hollow pipes (38) communicated with the end face of the upper circular plate are arranged at the bottom of the upper circular plate (20), the upper hollow pipes (38) are uniformly distributed in a surrounding manner along the circumferential direction by taking the central axis of the upper circular plate (20) as the center, the upper hollow pipes (38) communicated with the end face of the upper circular plate are also arranged at the middle position of the bottom of the upper circular plate (20), a plurality of groups of spiral blades (39) are arranged at the lower end of the outer wall of the upper hollow pipe (38), and the spiral blades (39) are uniformly distributed in a surrounding manner along the circumferential direction by taking the central axis of the upper hollow pipes (38) as the center;

the lower assembly comprises a lower circular plate (19), the end face of the lower circular plate (19) is abutted against the end face of the lower step (21), a plurality of groups of lower hollow pipes (40) which are communicated with the end faces of the lower circular plate (19) and correspond to the upper hollow pipes (38) one by one are arranged at the bottom of the lower circular plate (19), the upper ends of the lower hollow pipes (40) are sleeved on the outer sides of the spiral blades (39), and the lower ends of the lower hollow pipes (40) gradually shrink to narrow towards the direction of the central axis of the lower circular pipes to form a conical cover (41).

4. A composite air cleaner for a diesel engine as set forth in claim 3, wherein: a first supporting shaft sleeve (23) is arranged inside the air inlet chamber (17), two ends of the first supporting shaft sleeve (23) are respectively abutted against the lower circular plate (19) and the upper circular plate (20), and a plurality of groups of air holes (24) communicated with the air inlet chamber (17) are formed in the side wall of the first supporting shaft sleeve (23);

go out the inside of air cavity (16) and be equipped with amortization sponge layer (7), filter screen (25) and second support shaft sleeve (26), the inside radiation of partial inner wall of second support shaft sleeve (26) extends and forms first overlap edge (27), the bottom of connecting end cover (9) is attached to filter screen (25), amortization sponge layer (7) clamp is between filter screen (25) and first overlap edge (27), the both ends of second support shaft sleeve (26) offset with filter screen (25) and last plectane (20) respectively.

5. The composite air cleaner as claimed in claim 1, wherein: and the upper end and the lower end of the filter element (13) are respectively provided with a damping device.

6. The composite air cleaner as claimed in claim 5, wherein: damping device is including the annular pressure plate (33) of cover in core pipe (12) outside, the one end of annular pressure plate (33) offsets with the tip of filter core (13), the other end of annular pressure plate (33) is equipped with two sets of first draw-in grooves (34) that distribute with one heart, the bottom of sealed lid (14) and last casing (11) all is equipped with second draw-in groove (35) corresponding with first draw-in groove (34), be equipped with spring (36) that the extrusion was offset between first draw-in groove (34) and second draw-in groove (35).

7. The composite air cleaner as claimed in claim 1, wherein: dust cage (5) are connected the installation through the lower hasp (6) that the multiunit encircleed the distribution and lower casing (2), the bottom of dust cage (5) is equipped with dust exhaust valve (4), the hasp main part fixed mounting of lower hasp (6) is to the lower extreme of casing (2) down, the latch hook fixed mounting of lower hasp (6) is to the upper end of dust cage (5), connect end cover (9) and encircle the upper hasp (8) that distributes through the multiunit and be connected the installation with lower casing (2), the hasp main part fixed mounting of upper hasp (8) is to the upper end of casing (2) down, the latch hook fixed mounting of upper hasp (8) is to the lower extreme of connecting end cover (9).

8. The composite air cleaner as claimed in claim 1, wherein: the lower extreme of sealed lid (14) is equipped with second overlap edge (28) that the external radiation extends, the outer wall of going up casing (11) is equipped with third overlap edge (29) corresponding with second overlap edge (28), third overlap edge (29) adopt bolted connection with second overlap edge (28), the upper end of going up casing (11) is equipped with fourth overlap edge (32) that the internal radiation extends, fourth overlap edge (32) offset with the bottom of sealed lid (14).

9. The composite air cleaner as claimed in claim 8, wherein: rubber sealing gaskets are arranged between the second overlapping edge (28) and the third overlapping edge (29) and between the fourth overlapping edge (32) and the sealing cover (14).