CN115539420A - Combined dust suction device - Google Patents

Abstract

The invention discloses a combined dust suction device, which belongs to the technical field of dust suction devices and adopts the main technical scheme that the combined dust suction device comprises: a housing having an air duct; a transition piece mounted on the housing; the driving piece is arranged on the shell and provided with a cutting piece; the combined turbine is arranged on the driving piece and comprises a plurality of axial flow fan blades and a plurality of centrifugal fan blades, and the combined turbine corresponds to the transition piece; a fairing mounted on the transition piece; a dust hood mounted on the housing. The invention integrates the advantages of the axial flow fan and the centrifugal fan, can provide larger air volume to accommodate larger amount of dust on one hand, and can provide large air pressure to resist the resistance in the device, so that the dust can be smoothly and rapidly discharged, and the dust removal effect is better.

Description

Combined dust suction device

Technical Field

The invention relates to the technical field of dust suction devices, in particular to a combined dust suction device.

Background

When boards such as wood boards and composite boards are cut by cutting tools such as a milling cutter rotating at a high speed, a large amount of dust and chips are generated, and if the dust and the chips are not cleaned immediately, a plurality of adverse results can be generated: firstly, environmental pollution is caused, and the health of people is harmed; secondly, the scraps rub with the cutter at a high speed, and the cutter is abraded at an accelerated speed, so that the cutter is frequently replaced, and consumable materials are increased; finally, the friction between the chips and the cutter generates high temperature, which reduces the processing speed of the equipment and reduces the efficiency on one hand, and on the other hand, the high temperature can cause the chips to fire, which causes disastrous accidents. Therefore, timely cleaning of dust and debris is required.

In the prior art, in order to clean dust and debris, a dust suction device with negative pressure is often installed on a cutting tool to achieve the purpose, for example, an automatic dust suction cutting machine disclosed in chinese patent document No. CN103707350B, that is, a dust suction hood with negative pressure is installed on a cutting device to work. Generally, such a dust suction device has a duct and a negative pressure fan connected to the duct, and the existing negative pressure fan generally has two forms:

one is a centrifugal fan, which adopts a centrifugal fan and can provide larger air pressure, but the flow speed of air flow is not fast, so that the air volume is too small to accommodate a large amount of dust and debris, and the centrifugal fan exhausts air along the radial side of a rotating shaft, and when the internal structure of a dust suction pipeline is complicated, the air pressure can be weakened greatly;

the other type is an axial flow fan, which can accelerate the air flow, and the accelerated air flow flows along the axial direction of the rotating shaft, so that a larger air volume can be generated to entrain more dust and debris, however, the air pressure is not as good as that of a centrifugal fan, and when the air flow meets resistance, the air volume can be greatly reduced, so that the air speed is reduced, the dust and debris with larger weight are not easy to suck, and the dust suction effect is not ideal.

In view of the above, there is a need for an improved dust suction device to adapt to the working conditions of the cutting of the sheet material.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a combined dust suction device.

The invention discloses a combined dust suction device, which comprises: a housing having an air duct; a transition piece mounted on the housing; the driving piece is arranged on the shell, and a cutting piece is arranged on the driving piece; the combined turbine is arranged on the driving piece and comprises a plurality of axial flow blades and a plurality of centrifugal blades, and the combined turbine corresponds to the transition piece; a fairing mounted on the transition piece; a dust hood mounted on the housing.

Preferably, the drive member is a dual shaft motor and has a front shaft end on which the cutting member is mounted and a rear shaft end on which the combination turbine is mounted.

Preferably, the housing comprises an outer shell, an inner shell and a plurality of partitions, the inner shell is arranged in the outer shell, the partitions are connected between the outer shell and the inner shell, and the air duct is formed between the adjacent partitions; the driver is mounted in the inner housing.

Preferably, the combined turbine further comprises a rotating part, and the axial flow fan blade and the centrifugal fan blade are both mounted on the rotating part; the rotating part is provided with a shaft hole, and the rear shaft end of the driving part is arranged in the shaft hole.

Preferably, the plurality of centrifugal fan blades are arranged into one layer along the axial direction of the driving member, and the plurality of axial flow fan blades are arranged into two layers along the axial direction of the driving member; the axial flow fan blade is close to the driving piece along the axial direction of the driving piece, and the centrifugal fan blade deviates from the driving piece along the axial direction of the driving piece.

Preferably, the transition piece comprises an acceleration section and a pressurization section, wherein the acceleration section has a straight cylinder structure, the acceleration section is connected with the shell, the pressurization section is connected to the acceleration section, and the pressurization section has an arc-shaped side wall; the axial flow fan blade corresponds to the accelerating section, and the centrifugal fan blade corresponds to the pressurizing section.

Preferably, the fairing comprises a wind bowl and a guide vane, the wind bowl comprises a rectifying part and a connecting part, the rectifying part is connected with the pressurizing section, and the connecting part is connected with the rectifying part; the guide vanes are connected to the rectifying part.

Preferably, the fairing further comprises a matching part, the matching part is arranged in the wind bowl, and the guide vanes are connected between the wind bowl and the matching part.

Preferably, the fitting portion is provided with a fitting surface that faces the combined turbine; the combination turbine further includes a guide portion mounted on the rotation portion, the guide portion corresponding to a mating face of the mating portion.

Preferably, the dust hood comprises a connecting frame body, a telescopic cavity and an air inlet hood, the connecting frame body is connected with the shell, the telescopic cavity is connected to the connecting frame body, and the air inlet hood is installed on the telescopic cavity; the rear shaft end and the cutting piece correspond to the dust hood.

The beneficial effect of this application lies in:

on the one hand, axial fan and centrifugal fan's advantage has been fused, in the combination turbine of double-deck axial fan blade and individual layer centrifugal fan blade, double-deck axial fan blade can be with the air current acceleration, thereby provide bigger amount of wind in order to hold a larger amount of dust, and individual layer centrifugal fan blade can provide big wind pressure, the resistance inside the resistance of resistance device, thereby for smuggleing dust and clastic air current and providing powerful power and come to pass through pipeline secretly, the wind pressure is not enough when having solved the exclusive use axial fan dust absorption, the not good problem of produced dust removal effect of the insufficient amount of wind when the exclusive use centrifugal fan.

On the other hand, dust and piece on the counter plate carry out the in-process of collecting, and the air current is at first through the straight portion guide of inlet air channel, through the guide of flexion again, can produce ascending whirlwind in the suction hood, and the middle part vacuum of whirlwind is higher to be favorable to raising the piece of static state on the panel, make it get into the wind channel smoothly in order to be collected, remove dust more fast, high-efficient.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic overall structure diagram of a first perspective of the present invention;

FIG. 2 is a schematic overall structure diagram of a second perspective of the present invention;

FIG. 3 is an exploded view of the present invention from a first perspective;

fig. 4 is an exploded view from a second perspective of the present invention.

Description of reference numerals:

1. a housing; 11. a housing; 111. mounting holes; 12. an inner shell; 13. a partition portion; 131. an air duct;

2. a transition piece; 21. an acceleration section; 22. a pressurizing section; 221. fitting the projection;

3. a drive member; 31. a front shaft end; 32. a rear shaft end; 33. cutting the piece;

4. a combined turbine; 41. a rotating part; 411. a shaft hole; 42. axial-flow fan blades; 43. a centrifugal fan blade; 44. a guide section;

5. a cowling; 51. a wind bowl; 511. a rectifying section; 5111. a connection bump; 512. a connecting portion; 52. a guide vane; 53. a fitting portion; 531. a mating surface; 532. a dome;

6. a dust hood; 61. connecting the frame body; 611. installing a notch; 62. a telescopic cavity; 621. a connecting top surface; 622. a connecting bottom surface; 623. an arc-shaped edge; 624. an air inlet; 63. an air inlet cover; 631. a binding face; 632. an air inlet channel; 6321. a straight portion; 6322. a curved portion.

Detailed Description

In the following description, for purposes of explanation, numerous implementation details are set forth in order to provide a thorough understanding of various embodiments of the present invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such implementation details are not necessary. In addition, for the purpose of simplifying the drawings, certain well-known and conventional structures and components are shown in the drawings in a simplified schematic manner.

It should be noted that all the directional indicators in the embodiments of the present invention, such as up, down, left, right, front, and back, 8230, are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture as shown in the drawings, and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to the first, the second, etc. in the present invention are only used for description purposes, do not particularly refer to order or sequence, and do not limit the present invention, but only distinguish the elements or operations described in the same technical terms, and are not understood to indicate or imply relative importance or implicitly indicate the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:

referring to fig. 1-4, a combined dust suction device disclosed by the invention comprises a housing 1, a transition piece 2, a driving piece 3, a combined turbine 4, a fairing 5 and a dust hood 6, wherein the driving piece 3 is installed in the housing 1, the combined turbine 4 is installed on the driving piece 3, the fairing 5 is installed on the housing 1 through the transition piece 2, the combined turbine 4 is wrapped in the transition piece 2 and the fairing 5, the dust hood 6 is also installed on the housing 1, when the device is in operation, the driving piece 3 is powered on to start, the combined turbine 4 is operated to enable an airflow carrying dust and debris to enter the housing 1 through the dust hood 6, the airflow is guided, guided and rectified through the transition piece 2 and the fairing 5 and finally flows out from the end of the fairing 5, and the dust and debris carried in the airflow is collected and processed. The invention can be used for the use scene of plate cutting, but is not limited to plate cutting, and can be used for refitting on any equipment generating dust or scraps.

Referring to fig. 1 to 4, the housing 1 includes an outer shell 11, an inner shell 12 and a partition 13, wherein the outer shell 11 is a cylindrical structure with two open ends, the cross section of the outer shell 11 is rectangular, the inner shell 12 is installed inside the outer shell 11, the inner shell 12 is a cylindrical structure, the two ends of the inner shell 12 are both provided with openings, and a gap is formed between the inner shell 12 and the outer shell 11; the partition parts 13 are provided in plurality, the partition parts 13 are elongated plates, the partition parts 13 are disposed in a gap between the inner shell 12 and the outer shell 11 and arranged along the length direction of the inner shell 12 and the outer shell 11, the partition parts 13 and the inner shell 12 and the outer shell 11 are both fixedly connected, so that the inner shell 12 can be kept fixed relative to the outer shell 11 in position, and an air duct 131 is formed between adjacent partition parts 13 for allowing air flow to pass through.

Referring to fig. 1-4, the transition piece 2 includes an accelerating section 21 and a pressurizing section 22, the accelerating section 21 is installed at an opening at one end of the housing 11, and the accelerating section 21 is a long and straight cylinder with openings at two ends and used for guiding high-speed airflow; the pressurizing section 22 is a flared bowl-shaped structure, the side wall of the pressurizing section is an arc-shaped structure protruding outwards, two ends of the pressurizing section 22 are provided with round openings, a small end opening of the pressurizing section 22 is integrally connected to an opening of the accelerating section 21 deviating from the shell 11, the edge of a large end opening of the pressurizing section 22 is provided with a plurality of matching bumps 221, through holes are formed in the matching bumps 221 and used for connecting the fairing 5, the airflow direction in the pressurizing section 22 is changed, and higher air pressure is generated.

Referring to fig. 1 to 4, the driving member 3 is a dual-shaft motor, the driving member 3 is fixedly installed in the inner shell 12, a shaft of the driving member 3 is arranged along an axial direction of the inner shell 12, an end of the shaft of the driving member 3, which is away from the transition piece 2, is a front shaft end 31, an end of the shaft of the driving member 3, which is close to the transition piece 2, is a rear shaft end 32, and the front shaft end 31 of the driving member 3 is provided with a cutting piece 33, in this embodiment, the cutting piece 33 is a milling cutter, and the driving member 3 can drive the milling cutter to rotate when working, so as to cut a wood board; the rear shaft end 32 of the drive element 3 is connected to the compound turbine 4.

Referring to fig. 1-4, the combined turbine 4 includes a rotating portion 41, an axial flow fan blade 42, a centrifugal fan blade 43 and a guiding portion 44, wherein the rotating portion 41 is of a rod-shaped structure, an axial hole 411 is formed in an axial line of the rotating portion 41, a rear shaft end 32 of the driving member 3 is inserted into the axial hole 411 and coaxially and fixedly connected with the rotating portion 41, a side wall of the rotating portion 41 is obliquely arranged, the axial flow fan blade 42 and the centrifugal fan blade 43 are fixedly connected to the side wall of the rotating portion 41, the axial flow fan blade 42 is relatively closer to the driving member 3 along an axial direction, the centrifugal fan blade 43 is relatively farther from the driving member 3 along the axial direction, the axial flow fan blade 42 and the centrifugal fan blade 43 are respectively provided with a plurality of blades, an air exhaust direction of the axial flow fan blade 42 is along the axial direction and is used for increasing a flow velocity of an air flow, and an air exhaust direction of the centrifugal fan blade 43 is perpendicular to the axial direction and is used for pressurizing the air flow to resist resistance generated inside the device; the guiding portion 44 is a circular plate, the guiding portion 44 is disposed at an end of the rotating portion 41 away from the driving member 3 and is coaxially fixed with the rotating portion 41, and the guiding portion 44 is used for providing a guiding function for the airflow, so that the pressurized airflow can bypass the guiding portion 44 and then flow through the outside of the guiding portion 44.

Referring to fig. 1 to 4, specifically, the axial flow fan blades 42 are provided in two layers, each layer of axial flow fan blades 42 is provided with a plurality of axial flow fan blades, each layer of axial flow fan blades 42 is uniformly arranged along the circumferential direction of the outer wall of the rotating portion 41 at equal intervals, and an interval is provided between two adjacent layers of axial flow fan blades 42; the centrifugal fan blades 43 are provided with a layer, and the plurality of centrifugal fan blades 43 are uniformly arranged at equal intervals along the circumferential direction of the outer wall of the rotating part 41; two-layer axial fan blade 42 all corresponds the setting in the acceleration section 21 of transition piece 2, and centrifugal fan blade 43 corresponds the setting in the pressurization section 22 of transition piece 2, and the air current can produce bigger amount of wind in suction hood 6 department after the acceleration of axial fan blade 42, improves the effect scope of device when absorbing dust and piece, and the air current can make the pressure increase of air current after through centrifugal fan blade 43 to be favorable to the device to absorb a larger amount of dust and piece.

Referring to fig. 1 to 4, the fairing 5 includes a wind bowl 51, a guide vane 52 and a matching portion 53, wherein the wind bowl 51 includes a rectifying portion 511 and a connecting portion 512, the rectifying portion 511 is of a horn-shaped structure, openings are provided at both ends of the rectifying portion 511, a large end opening of the rectifying portion 511 is connected to an opening of the pressurizing section 22 of the transition piece 2, a connecting protrusion 5111 is provided at an edge of the large end opening of the rectifying portion 511, a through hole is provided on the connecting protrusion 5111, the rectifying portion 511 is connected to the pressurizing section 22 through a connecting member (not shown in the figure) penetrating between the connecting protrusion 5111 and the matching protrusion 221, the connecting portion 512 is integrally connected to a small end opening of the rectifying portion 511, the connecting portion 512 is of a cylindrical structure, and the connecting portion 512 can be connected to a pipeline for collecting dust and debris, so that dust and debris are finally collected.

Referring to fig. 1 to 4, the fitting portion 53 of the fairing 5 is a rotating body, the fitting portion 53 is coaxially disposed inside the wind bowl 51, a gap is disposed between the fitting portion 53 and an inner wall of the wind bowl 51, the fitting portion 53 is provided with a fitting surface 531 facing the combined turbine 4 along an axial direction, the fitting portion 53 is further provided with a dome 532 departing from the combined turbine 4 along the axial direction, wherein the fitting surface 531 is a plane, a size and a dimension of the fitting surface 531 are the same as a size and a dimension of the guide portion 44, the fitting portion 53 has an arc-shaped outer wall, and the fitting surface 531 and the guide portion 44 are matched to provide a guide for an air flow, so that the pressurized air flow can flow through the gap between the fitting portion 53 and the wind bowl 51, and the rectification is facilitated.

Referring to fig. 1 to 4, a plurality of guide vanes 52 of the fairing 5 are provided, each guide vane 52 is an arc-shaped vane, each guide vane 52 is provided at a gap between the matching portion 53 and the fairing portion 511, each guide vane 52 is fixedly connected with the matching portion 53 and the fairing portion 511, the plurality of guide vanes 52 are uniformly spaced at equal intervals around the axial direction of the matching portion 53, a channel is formed between the guide vanes 52, one end of the channel leads to the pressurizing section 22 of the transition piece 2, the other end of the channel leads to the connecting portion 512 of the fairing 5, the guide vanes 52 can guide the direction of the pressurized airflow, the turbulent flow is arranged into a laminar flow, and finally the airflow flowing out of the connecting portion 512 enters the connecting portion 512 along the axial direction, so that the airflow is convenient to be transmitted and collected.

Referring to fig. 1 to 4, the dust hood 6 is installed at an opening of the housing 11 close to the front shaft end 31, the dust hood 6 is made of an elastic material, which is rubber in this embodiment, the dust hood 6 includes a connecting frame 61, a telescopic cavity 62 and an air inlet cover 63, wherein the connecting frame 61 is a cylindrical structure with a rectangular cross section, openings are provided at both ends of the connecting frame 61, the connecting frame 61 is sleeved at the opening of the housing 11, an installation notch 611 is provided at an edge of the connecting frame 61 close to the opening of the rear shaft end 32, correspondingly, the housing 11 is provided with an installation hole 111, and the connecting frame 61 is connected to the housing 11 through a connecting member (not shown in the figure) penetrating through the installation notch 611 and the installation hole 111.

Referring to fig. 1-4, the whole ring-shaped telescopic cavity 62, telescopic cavity 62 is connected at the opening part that connects frame 61 and deviates from back axle head 32, telescopic cavity 62 has connection top surface 621 and connection bottom surface 622, wherein connect top surface 621 and be close to back axle head 32 up, connect bottom surface 622 and deviate from back axle head 32 down, connect top surface 621 and be connected frame 61 body coupling, connect top surface 621 and be connected with arc limit 623 between the bottom surface 622, make telescopic cavity 62 can form flat cavity structure, air intake 624 has been seted up at telescopic cavity 62's middle part, air intake 624 is circular through-hole, back axle head 32 and the cutting member 33 of driving piece 3 all pass air intake 624 and stretch to the below of shell 11.

Referring to fig. 1 to 4, the air inlet cover 63 is a flared circular cover, the middle of the air inlet cover 63 protrudes upwards, the small end of the air inlet cover 63 is opened upwards and is fixedly connected with the edge of the air inlet 624, the large end of the air inlet cover 63 is opened downwards, the edge of the large end of the air inlet cover 63 is provided with an attachment surface 631, the attachment surface 631 is a plane, and the attachment surface 631 is used for attaching to a panel to be cleaned, so as to provide a semi-closed space for generating air pressure; be provided with a plurality of inlet air duct 632 on binding face 631, inlet air duct 632 is the sunken passageway that forms on binding face 631, a plurality of inlet air duct 632 along the equidistant evenly distributed of the axis direction of driving piece 3, inlet air duct 632 includes straight portion 6321 and flexion 6322, straight portion 6321 sets up the outside edge at binding face 631, flexion 6322 inwards extends to the middle part of air inlet cover 63, flexion 6322 is the arc structure, when the air current got into air inlet cover 63, at first through straight portion 6321 guide, through the guide of flexion 6322, and then can produce ascending whirlwind in suction hood 6, the middle part vacuum of whirlwind is higher, thereby be favorable to raising the piece of static on the panel, make it smoothly get into wind channel 131 in order to be collected.

The implementation principle of the invention is as follows: when the dust collector is used, the attaching surface 631 of the air inlet cover 63 is attached to a panel to be used for collecting dust and debris, the driving part 3 is powered on, the driving part 3 drives the cutting part 33 to work to cut a wood board, the debris and the dust are generated, meanwhile, the driving part 3 can drive the combined turbine 4 to work, the combined turbine 4 rotates at a high speed, the axial flow fan blade 42 and the centrifugal fan blade 43 of the combined turbine 4 can generate airflow with large air volume and high air pressure, and therefore the dust and the debris on the panel can enter the air duct 131 of the shell 1 through the air inlet channel 632 on the dust collection cover 6 along with the airflow, and then the airflow passes through the transition piece 2 and the fairing 5 and is collected and processed through the conveying pipeline connected to the transition piece 2.

The beneficial effects of the invention are:

on the one hand, the advantages of the axial flow fan and the centrifugal fan are fused, in the combined turbine 4 of the double-layer axial flow fan blades 42 and the single-layer centrifugal fan blades 43, the double-layer axial flow fan blades 42 can accelerate air flow, so that larger air volume is provided to accommodate larger amount of dust, the single-layer centrifugal fan blades 43 can provide large air pressure, resistance inside the device is resisted, so that strong power is provided for air flow carrying dust and scraps to pass through a conveying pipeline, and the problems that the air pressure is insufficient when the axial flow fan is used alone for dust collection, and the dust collection effect is poor due to insufficient air volume when the centrifugal fan is used alone are solved.

On the other hand, the in-process of collecting is carried out with the piece to the dust on the panel, and the air current is at first through straight portion 6321 guide of inlet air channel 632, through the guide of flexion 6322 again, can produce ascending whirlwind in suction hood 6, and the middle part vacuum of whirlwind is higher to be favorable to raising the piece of static state on the panel, make it get into wind channel 131 smoothly in order to be collected, remove dust more fast, high-efficient.

The above is merely an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (10)

1. A combined dust suction device is characterized by comprising:

a housing (1), the housing (1) having an air duct (131);

a transition piece (2), the transition piece (2) being mounted on the housing (1);

the driving piece (3) is installed on the shell (1), and a cutting piece (33) is installed on the driving piece (3);

the combined turbine (4) is installed on the driving piece (3), the combined turbine (4) comprises a plurality of axial flow fan blades (42) and a plurality of centrifugal fan blades (43), and the combined turbine (4) corresponds to the transition piece (2);

a fairing (5), said fairing (5) mounted on said transition piece (2);

the dust hood (6), dust hood (6) install on casing (1).

2. A combined suction device according to claim 1, c h a r a c t e r i z e d in that the drive member (3) is a two-shaft motor and has a front shaft end (31) and a rear shaft end (32), the cutting member (33) being mounted on the front shaft end (31) and the combined turbine (4) being mounted on the rear shaft end (32).

3. The combined vacuum cleaner as claimed in claim 2, wherein the housing (1) comprises an outer casing (11), an inner casing (12) and a plurality of partitions (13), the inner casing (12) is disposed in the outer casing (11), the partitions (13) are connected between the outer casing (11) and the inner casing (12), and the air channels (131) are formed between the adjacent partitions (13);

the drive element (3) is mounted in the inner housing (12).

4. A combined suction device according to claim 3, characterised in that said combined turbine (4) further comprises a rotating portion (41), said axial blades (42) and said centrifugal blades (43) being mounted on said rotating portion (41);

the rotating part (41) is provided with a shaft hole (411), and the rear shaft end (32) of the driving part (3) is installed in the shaft hole (411).

5. A combined suction device according to claim 4, characterised in that a plurality of said centrifugal blades (43) are arranged in one layer along the axial direction of said driving member (3), and a plurality of said axial blades (42) are arranged in two layers along the axial direction of said driving member (3);

the axial flow fan blade (42) is close to the driving piece (3) along the axial direction of the driving piece (3), and the centrifugal fan blade (43) deviates from the driving piece (3) along the axial direction of the driving piece (3).

6. Combined suction unit according to any one of claims 1-5, c h a r a c t e r i z e d in that the transition piece (2) comprises an acceleration section (21) and a pressure section (22), the acceleration section (21) having a straight-tube construction, the acceleration section (21) being connected to the housing (1), the pressure section (22) being connected to the acceleration section (21), the pressure section (22) having curved side walls;

the axial flow fan blade (42) corresponds to the acceleration section (21), and the centrifugal fan blade (43) corresponds to the pressurization section (22).

7. The combined vacuum cleaner as claimed in claim 6, wherein the fairing (5) comprises a wind bowl (51) and a guide vane (52), the wind bowl (51) comprises a fairing section (511) and a connecting section (512), the fairing section (511) is connected with the pressurizing section (22), and the connecting section (512) is connected with the fairing section (511); the flow guide vane (52) is connected to the rectifying part (511).

8. A combined suction device according to claim 7, characterised in that the fairing (5) further comprises an engagement portion (53), the engagement portion (53) being arranged inside the wind bowl (51), the guide vane (52) being connected between the wind bowl (51) and the engagement portion (53).

9. Combined suction cleaner according to claim 8, characterized in that the fitting part (53) is provided with a fitting surface (531), the fitting surface (531) facing the combined turbine (4);

the combination turbine (4) further includes a guide portion (44), the guide portion (44) being mounted on the rotating portion (41), the guide portion (44) corresponding to a mating face (531) of the mating portion (53).

10. The combined dust collector of any one of claims 2-5, wherein the dust collection cover (6) comprises a connecting frame (61), a telescopic cavity (62) and an air inlet cover (63), the connecting frame (61) is connected with the housing (1), the telescopic cavity (62) is connected with the connecting frame (61), and the air inlet cover (63) is mounted on the telescopic cavity (62);

the rear shaft end (32) and the cutting piece (33) correspond to the dust hood (6).

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