CN210769409U

CN210769409U - Combined case

Info

Publication number: CN210769409U
Application number: CN201921451809.0U
Authority: CN
Inventors: 郭红飞
Original assignee: Foshan City Nanhai Jiuzhou Popula Fan Co Ltd
Current assignee: Foshan City Nanhai Jiuzhou Popula Fan Co Ltd
Priority date: 2019-09-02
Filing date: 2019-09-02
Publication date: 2020-06-16
Anticipated expiration: 2029-09-02

Abstract

The utility model discloses a combined machine case, which comprises a top plate, a bottom plate, a left side board, a right side board, the bottom plate sets up along the horizontal plane, be provided with four vertical boards on the bottom plate, four vertical boards set up in the upper surface of bottom plate, four vertical boards enclose into an opening first standing groove that makes progress with the bottom plate, a left side board, the right side board is parallel to each other, a left side board, the right side board all sets up in the interior bottom surface of first standing groove, a left side board, the left side board of right side board both respectively the left vertical board of fixed connection and the vertical board on right side, the lower surface of roof is provided with four risers, four riser perpendicular roofs, four risers enclose into a second standing groove that opening is decurrent with the roof, the outside at left side board and right side board is overlapped to the second standing groove, the. The utility model provides a combined machine case that the seal is good.

Description

Combined case

Technical Field

The utility model relates to a quick-witted case field, especially a combination machine case.

Background

Axial fan is used for ventilating to indoor, and traditional axial fan mainly adopts welded connection for axial fan's shell and the support direct welded connection of motor become integrative, lead to overall structure heavier, and the welded connected mode leads to the inconvenience of installing and removing moreover. In addition, the shell of the current axial flow fan is often directly connected with four adjacent plates through corner connectors, so that the plates are erected into a frame shape. However, such a connection manner causes a gap to exist on the casing of the axial flow fan, and during the use of the axial flow fan, more wind leaks from the casing shaft of the compressor, which affects the actual use effect of the axial flow fan.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: at least one of the problems set forth above is solved.

The utility model provides a solution of its technical problem is:

a combined machine case comprises a top plate, a bottom plate, a left plate and a right plate, wherein the bottom plate is arranged along a horizontal plane, the bottom plate is provided with four vertical plates which are arranged on the upper surface of the bottom plate, a first placing groove with an upward opening is formed by the four vertical plates and the bottom plate, the left plate and the right plate are parallel to each other, the left plate and the right plate are both arranged on the inner bottom surface of the first placing groove, the left plate and the right plate are respectively and fixedly connected with the left vertical plate and the right vertical plate, the lower surface of the top plate is provided with four vertical plates which are vertical to the top plate, the four vertical plates and the top plate enclose a second placing groove with a downward opening, the second standing groove is sleeved on the outer sides of the left plate and the right plate, the left plate is fixedly connected with the left vertical plate, and the right plate is fixedly connected with the right vertical plate.

As a further improvement of the technical scheme, the bottom plate is rectangular, each edge of the bottom plate is provided with a folded edge, each folded edge is bent upwards to form the vertical plate, and the edges of the adjacent vertical plates are abutted and aligned.

As a further improvement of the technical scheme, the top plate is arranged in a rectangular shape, each edge of the top plate is provided with a bending edge, each bending edge is bent downwards to form the vertical plate, the edges of the vertical plates abut against and are aligned, and the vertical plates are coplanar in one-to-one correspondence.

As a further improvement of the above technical solution, an air collecting plate is arranged between the top plate and the bottom plate, the upper side of the air collecting plate is fixedly connected with the top plate, the lower side of the air collecting plate is fixedly connected with the bottom plate, the air collecting plate is perpendicular to the top plate, the air collecting plate is perpendicular to the left plate, an air collecting port penetrating through the air collecting plate is formed in the air collecting plate, and the air collecting port is provided with an air collecting disc in a surrounding manner.

As a further improvement of the technical proposal, the left plate and the surface back to the right plate are provided with a first groove, the first groove is arranged along the vertical direction, the bottom surface of the first groove is provided with a plurality of through holes which are linearly arranged along the vertical direction, each through hole is rotatably connected with a rotating shaft, one side of each rotating shaft far away from the right plate is fixedly connected with a connecting rod, the connecting rods are arranged along the radial direction of the rotating shaft, all the connecting rods are parallel to each other, a linkage rod is arranged in the first groove, one end of each connecting rod, which is far away from the rotating shaft, is hinged with the linkage rod, the utility model discloses a set up, including gangbar, left side board, baffle, pivot one-to-one, the gangbar sets up along vertical direction, a left side board with be provided with the baffle that a plurality of set up along left right direction between the board of the right side, a plurality of the baffle is arranged along upper and lower direction, baffle fixed connection the pivot, the baffle with the pivot one-to-one sets up.

As a further improvement of the above technical scheme, the right side board symmetry the left side board sets up, be provided with the second recess on the board of the right side, second recess symmetry first recess sets up, a plurality of trompil has been seted up to the bottom surface of second recess, each the trompil with the through-hole is just to setting up, each the axis of rotation has been inserted to the trompil, the axis of rotation with pivot one-to-one, the axis of rotation with baffle one-to-one rigid coupling, be provided with the connecting rod in the axis of rotation, the connecting rod with the connecting rod one-to-one symmetry sets up, the second recess is provided with the body of rod, the body of rod with the gangbar symmetry sets up, each connecting rod end hinge connection.

The utility model also provides an axial fan, include a combined machine case, be provided with the motor support frame on the interior bottom surface of first standing groove, vertical fixed plate, horizontal fixed plate of motor support frame package, vertical fixed plate fixed connection the interior bottom surface of first standing groove, horizontal fixed plate is perpendicular vertical fixed plate, the middle part fixed connection of horizontal fixed plate vertical fixed plate, the both ends difference fixed connection of horizontal fixed plate left side board with right side board, the top surface of horizontal fixed plate is provided with driving motor, driving motor's output shaft drive connects the fan blade, driving motor's output shaft sets up along the fore-and-aft direction, the air-out direction of fan blade is just right the setting of collection wind dish.

As a further improvement of the above technical solution, two vertical plates perpendicular to the left plate have upper ends respectively oriented to each other and extend a first horizontal plate along a horizontal direction, two ends of the first horizontal plates close to each other respectively extend vertically and upwardly to form a first plate body, the height of the first plate body is lower than the height of the lowest position of the wind collecting plate, and the wind collecting plate is arranged between the two first plate bodies.

As a further improvement of the above technical solution, the vertical plates are coplanar with the vertical plates in a one-to-one correspondence manner, a second horizontal plate is extended from the lower end of the vertical plate perpendicular to the left plate toward the horizontal direction of the other vertical plate, a second plate body is vertically extended downwards from the end of the second horizontal plate, the height of the lowest position of the second plate body is higher than the height of the highest position of the wind collecting plate, and the second plate body is coplanar with the corresponding first plate body.

As a further improvement of the above technical solution, with the air outlet direction of the fan blade as the front, the rear side edges of the left plate and the right plate are bent toward each other to form a limiting edge, each limiting edge is flush with the plates at the rear sides of the top plate and the bottom plate, the rear side of the top plate is provided with a protective net, the protective net abuts against the first plate body, the second plate body and the limiting edges, the protective net is fixedly connected with the first plate body, the second plate body and the limiting edges, and the upper side and the lower side of the protective net are respectively abutted against the second horizontal plate and the first horizontal plate.

The utility model has the advantages that: through the arrangement of the first placing groove and the second placing groove, the upper side edge and the lower side edge of the left plate and the right plate are enclosed between the vertical plate and the vertical plate, so that the air tightness of the case is effectively improved, in addition, the left plate is fixedly connected with the left vertical plate, the right plate is fixedly connected with the right vertical plate, the left plate and the right plate are respectively and fixedly connected with the left vertical plate and the right vertical plate, so that the connection between the top plate, the left plate, the right plate and the bottom plate is more stable, in the practical use, a technical worker in the field can install a driving motor between the top plate, the bottom plate, the left plate and the right plate, the fan blade is driven to rotate through the driving motor, and the air outlet direction of the fan blade is parallel to the top plate, the bottom plate, the left; the air tightness of the case is more excellent.

Drawings

In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures represent only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from these figures without inventive effort.

Fig. 1 is an exploded view of an axial flow fan according to the present invention;

fig. 2 is an exploded view of a combination case of the present invention;

fig. 3 is an isometric view of the top plate of the present invention;

fig. 4 is an isometric view of a combination case of the present invention.

In the drawings: 1-top plate, 2-bottom plate, 3-left plate, 4-right plate, 5-vertical plate, 6-vertical plate, 7-wind collecting plate, 8-wind collecting opening, 9-wind collecting disc, 10-first groove, 11-second groove, 12-connecting rod, 13-rotating shaft, 14-linkage rod, 15-rotating shaft, 16-connecting rod, 17-rod body, 18-vertical fixing plate, 19-horizontal fixing plate, 20-driving motor, 21-fan blade, 22-first horizontal plate, 23-first plate body, 24-second horizontal plate, 25-second plate body, 26-limiting edge, 27-protective net and 28-baffle.

Detailed Description

The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention. In addition, all the coupling/connection relationships mentioned herein do not mean that the components are directly connected, but mean that a better coupling structure can be formed by adding or reducing coupling accessories according to specific implementation conditions. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.

Referring to fig. 1 to 4, a combined chassis comprises a top plate 1, a bottom plate 2, a left plate 3 and a right plate 4, wherein the bottom plate 2 is arranged along a horizontal plane, the bottom plate 2 is provided with four vertical plates 5, the four vertical plates 5 are arranged on the upper surface of the bottom plate 2, the four vertical plates 5 and the bottom plate 2 enclose a first placing groove with an upward opening, the left plate 3 and the right plate 4 are parallel to each other, the left plate 3 and the right plate 4 are both arranged on the inner bottom surface of the first placing groove, the left plate 3 and the right plate 4 are respectively and fixedly connected with the left vertical plate 5 and the right vertical plate 5, the lower surface of the top plate 1 is provided with four vertical plates 6, the four vertical plates 6 are perpendicular to the top plate 1, the four vertical plates 6 and the top plate 1 enclose a second placing groove with a downward opening, and the second placing groove is sleeved on the outer sides of the left plate 3 and the right plate 4, the left side of the left plate 3 is fixedly connected with the vertical plate 6, and the right side of the right plate 4 is fixedly connected with the vertical plate 6.

In this embodiment, the first and second placing grooves are arranged to surround the upper and lower edges of the left and

right plates

3 and 4 between the vertical plates 6 and the vertical plates, so as to effectively improve the air tightness of the chassis, in addition, the left plate 3 is fixedly connected to the left vertical plate 6, the right plate 4 is fixedly connected to the right vertical plate 6, and the left plate 3 and the right plate 4 are respectively fixedly connected to the left vertical plate 5 and the right vertical plate 5, so that the connection between the top plate 1, the left plate 3, the right plate 4 and the bottom plate 2 is more stable, in actual use, a person skilled in the art can install a driving motor 20 between the top plate 1, the bottom plate 2, the left plate 3 and the right plate 4, and drive the fan blade 21 to rotate through the driving motor 20, and the air outlet direction of the fan blade 21 is parallel to the top plate 1, the bottom plate 2, the left plate 3 and the right plate 4; the air tightness of the case is more excellent.

In actual use, the left plate 3 and the right plate 4 are connected with the corresponding vertical plate and the vertical plate 6 through screws or rivets.

Further as a preferred embodiment, the bottom plate 2 is rectangular, each side of the bottom plate 2 is provided with a folded edge, each folded edge is bent upwards to form the vertical plate 5, and the edges of the adjacent vertical plates 5 are abutted and aligned. The structure is simple, the setting is convenient, and the processing can be conveniently carried out.

Further as preferred embodiment, roof 1 is the rectangle setting, every limit of roof 1 all is provided with the limit of bending, every the limit of bending is bent downwards and is formed riser 6, and is adjacent the edge of riser 6 offsets and aligns, riser 6 with vertical board 5 one-to-one coplane. This simple structure, set up conveniently, can be convenient process to the processing that bottom plate 2 and bottom plate 2 can general match.

As a preferred embodiment, an air collecting plate 7 is arranged between the top plate 1 and the bottom plate 2, the upper edge of the air collecting plate 7 is fixedly connected to the top plate 1, the lower edge of the air collecting plate 7 is fixedly connected to the bottom plate 2, the air collecting plate 7 is perpendicular to the top plate 1, the air collecting plate 7 is perpendicular to the left plate 3, an air collecting port 8 penetrating through the air collecting plate 7 is formed in the air collecting plate 7, and an air collecting disc 9 is arranged around the air collecting port 8. This simple structure, setting are convenient, and 7 fixed connection roof 1, bottom plate 2 of wind-collecting plate, this connected mode are convenient, and the accessible screw is connected, through the setting of wind-collecting opening 8, wind-collecting ware, during the use, all install fan to quick-witted incasement back, can make the air-out more stable.

As a preferred embodiment, a first groove 10 is provided on the surface of the left plate 3 facing away from the right plate 4, the first groove 10 is disposed along the vertical direction, a plurality of through holes are provided on the bottom surface of the first groove 10, the through holes are linearly arranged along the vertical direction, each through hole is rotatably connected with a rotating shaft 13, one side of each rotating shaft 13 away from the right plate 4 is fixedly connected with a connecting rod 12, the connecting rods 12 are disposed along the radial direction of the rotating shaft 13, all the connecting rods 12 are parallel to each other, a linkage rod 14 is provided in the first groove 10, one end of each connecting rod 12 away from the rotating shaft 13 is hinged with the linkage rod 14, the linkage rod 14 is disposed along the vertical direction, a plurality of baffles 28 disposed along the left-right direction are provided between the left plate 3 and the right plate 4, and a plurality of the baffles 28 are arranged along the up-down direction, the baffle 28 is fixedly connected with the rotating shaft 13, and the baffle 28 and the rotating shaft 13 are arranged in a one-to-one correspondence manner. This simple structure, it is convenient to set up, setting through this structure, thereby a plurality of baffle 28 combination forms a shutter, when using, the field technical staff can install the fan in the quick-witted case, the upset of baffle 28 is driven to the wind that blows off through the fan, the through-hole rotates and connects pivot 13, when one of them baffle 28 method upset, it takes place pivot 13 to drive pivot 13, pivot 13 drives connecting rod 12 swing, thereby drive the motion of gangbar 14, and then drive other connecting rod 12 motions and make all pivot 13 take place to rotate simultaneously, thereby make all baffle 28 simultaneous movement.

Further as preferred embodiment, the right side board 4 symmetry the left side board 3 sets up, be provided with second recess 11 on the board 4 of the right side, second recess 11 symmetry first recess 10 sets up, a plurality of trompil has been seted up to the bottom surface of second recess 11, each the trompil with the through-hole is just to setting up one by one, each the axis of rotation 15 has been inserted to the trompil, axis of rotation 15 with pivot 13 one-to-one, axis of rotation 15 with baffle 28 one-to-one rigid coupling, be provided with connecting rod 16 on the axis of rotation 15, connecting rod 16 with connecting rod 12 one-to-one sets up, second recess 11 is provided with the body of rod 17, the body of rod 17 with the 14 symmetry of gangbar sets up, each 16 terminal hinged joints of connecting rod the body of rod 17. The structure is simple, the arrangement is convenient, and the left side and the right side of the rotating structure of the baffle 28 are more stable through the arrangement of the structure.

The utility model provides an axial fan, include a combination machine case, be provided with the motor support frame on the interior bottom surface of first standing groove, motor support frame package vertical fixed plate 18, horizontal

fixed plate

19, 18 fixed connection of vertical fixed plate the interior bottom surface of first standing groove, horizontal fixed plate 19 is perpendicular vertical fixed plate 18, horizontal fixed plate 19's middle part fixed connection vertical fixed plate 18, horizontal fixed plate 19's both ends difference fixed connection left side board 3 with right side board 4, horizontal fixed plate 19's top surface is provided with driving motor 20, driving motor 20's output shaft drive connects fan blade 21, driving motor 20's output shaft sets up along the fore-and-aft direction, the air-out direction of fan blade 21 is just right the setting of collection wind dish 9. This simple structure, setting are convenient, through the setting of this structure to more convenient installation driving motor 20 and fan blade 21, driving motor 20 forms the fan with the combination of fan blade 21.

As a further preferred embodiment, two vertical plates 5 perpendicular to the left plate 3 have upper ends respectively extending in a horizontal direction toward each other to form a first horizontal plate 22, one end of each of the two first horizontal plates 22 close to each other vertically extends upward to form a first plate body 23, the height of the first plate body 23 is lower than the height of the lowest position of the wind collecting plate 9, and the wind collecting plate 7 is disposed between the two first plate bodies 23. This simple structure, setting are convenient to the effectual position of avoiding the air-out, in addition, through the setting of first horizontal plate 22, first plate body 23, the board-like structure of utilization first horizontal plate 22, first plate body 23 installation that can be convenient is to quick-witted case.

Further as a preferred embodiment, the vertical plates 6 and the vertical plates 5 are coplanar in a one-to-one correspondence manner, a second horizontal plate 24 extends from the lower end of one vertical plate 6 of the left plate 3 towards the horizontal direction of the other vertical plate 6, a second plate body 25 vertically extends downwards from the end of the second horizontal plate 24, the height of the lowest position of the second plate body 25 is higher than the height of the highest position of the wind collecting plate 9, and the second plate body 25 is coplanar with the corresponding first plate body 23. This simple structure, setting are convenient to the effectual position of avoiding the air-out, in addition, through the setting of second horizontal plate 24, second plate body 25, the board-like structure is installed to first horizontal plate 22, first plate body 23 installation that can be convenient utilization to quick-witted case.

Further, as a preferred embodiment, with the air outlet direction of the fan blade 21 as the front, the rear sides of the left plate 3 and the right plate 4 are bent toward each other to form a limiting edge 26, each limiting edge 26 is flush with the plates at the rear sides of the top plate 1 and the bottom plate 2, a protective net 27 is arranged at the rear side of the top plate 1, the protective net 27 abuts against the first plate 23, the second plate 25 and the limiting edge 26, the protective net 27 is fixedly connected with the first plate 23, the second plate 25 and the limiting edge 26, and the upper and lower sides of the protective net 27 abut against the second horizontal plate 24 and the first horizontal plate 22 respectively. This simple structure, set up conveniently, through the setting of spacing limit 26, second horizontal plate 24, first horizontal plate 22, first plate body 23, second plate body 25 to can be convenient install fixed to protection network 27.

While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the details of the embodiments shown, but is capable of various modifications and substitutions without departing from the spirit of the invention.

Claims

1. The utility model provides a combination machine case, includes roof (1), bottom plate (2), left board (3), right board (4), its characterized in that: the bottom plate (2) is arranged along a horizontal plane, four vertical plates (5) are arranged on the bottom plate (2), the four vertical plates (5) are arranged on the upper surface of the bottom plate (2), a first placing groove with an upward opening is enclosed by the four vertical plates (5) and the bottom plate (2), the left plate (3) and the right plate (4) are parallel to each other, the left plate (3) and the right plate (4) are both arranged on the inner bottom surface of the first placing groove, the left plate (3) and the right plate (4) are respectively and fixedly connected with the left vertical plate (5) and the right vertical plate (5), the lower surface of the top plate (1) is provided with four vertical plates (6), the four vertical plates (6) are vertical to the top plate (1), and the four vertical plates (6) and the top plate (1) enclose into a second placing groove with a downward opening, the second placing groove is sleeved on the outer sides of the left plate (3) and the right plate (4), the left plate (3) is fixedly connected with the left vertical plate (6), and the right plate (4) is fixedly connected with the right vertical plate (6).

2. A combined chassis according to claim 1, wherein: the bottom plate (2) is rectangular, each edge of the bottom plate (2) is provided with a folded edge, each folded edge is bent upwards to form the vertical plate (5), and the edges of the adjacent vertical plates (5) are abutted and aligned.

3. A combined chassis according to claim 2, wherein: roof (1) is the rectangle setting, every limit of roof (1) all is provided with the limit of bending, every the limit of bending downwards bend and form riser (6), it is adjacent the edge of riser (6) offsets and aligns, riser (6) with vertical board (5) one-to-one coplane.

4. A combined chassis according to claim 2, wherein: roof (1) with be provided with between bottom plate (2) wind-collecting plate (7), the higher authority fixed connection of wind-collecting plate (7) roof (1), the lower authority fixed connection of wind-collecting plate (7) bottom plate (2), wind-collecting plate (7) are perpendicular roof (1), wind-collecting plate (7) are perpendicular left side board (3), set up on wind-collecting plate (7) and run through wind-collecting opening (8) of wind-collecting plate (7), wind-collecting opening (8) set up to encircle and are provided with wind-collecting plate (9).

5. A combined chassis according to claim 1, wherein: a first groove (10) is formed in the surfaces of the left plate (3) and the right plate (4) which face away from the left plate, a plurality of through holes are formed in the bottom surface of the first groove (10), the through holes are linearly arranged in the vertical direction, each through hole is rotatably connected with a rotating shaft (13), one side, far away from the right plate (4), of each rotating shaft (13) is fixedly connected with a connecting rod (12), the connecting rods (12) are arranged in the radial direction of the rotating shafts (13), all the connecting rods (12) are parallel to each other, a linkage rod (14) is arranged in the first groove (10), one end, far away from the rotating shafts (13), of each connecting rod (12) is hinged to the linkage rod (14), the linkage rod (14) is arranged in the vertical direction, a plurality of baffle plates (28) arranged in the left-right direction are arranged between the left plate (3) and the right plate (4), the plurality of baffle (28) are arranged along the up-down direction, baffle (28) fixed connection pivot (13), baffle (28) with pivot (13) one-to-one sets up.

6. The chassis assembly of claim 5, wherein: the right plate (4) is arranged symmetrically to the left plate (3), a second groove (11) is arranged on the right plate (4), the second groove (11) is arranged symmetrically to the first groove (10), a plurality of openings are arranged on the bottom surface of the second groove (11), each opening is arranged opposite to the through hole one by one, a rotating shaft (15) is inserted into each opening, the rotating shafts (15) and the rotating shafts (13) are symmetrical one by one, the rotating shafts (15) are fixedly connected with the baffles (28) in a one-to-one corresponding mode, the rotating shaft (15) is provided with connecting rods (16), the connecting rods (16) and the connecting rods (12) are symmetrically arranged one by one, the second groove (11) is provided with a rod body (17), the rod body (17) and the linkage rod (14) are symmetrically arranged, and each tail end of the connecting rod (16) is hinged with the rod body (17).

7. The utility model provides an axial fan which characterized in that: the combined machine case comprises the combined machine case as claimed in claim 4, wherein a motor supporting frame is arranged on the inner bottom surface of the first placing groove, the motor supporting frame comprises a vertical fixing plate (18) and a horizontal fixing plate (19), the vertical fixing plate (18) is fixedly connected with the inner bottom surface of the first placing groove, the horizontal fixing plate (19) is vertical to the vertical fixing plate (18), the middle part of the horizontal fixing plate (19) is fixedly connected with the vertical fixing plate (18), the two ends of the horizontal fixing plate (19) are respectively fixedly connected with the left plate (3) and the right plate (4), a driving motor (20) is arranged on the top surface of the horizontal fixing plate (19), an output shaft of the driving motor (20) is connected with a fan blade (21) in a driving way, the output shaft of the driving motor (20) is arranged along the front-back direction, and the air outlet direction of the fan blade (21) is arranged right opposite to the air collecting disc (9).

8. The axial flow fan of claim 7, wherein: perpendicular to two of left board (3) the upper end of vertical board (5) is respectively extended a first horizontal plate (22), two along the horizontal direction of the upper end of being close to each other first horizontal plate (22) is vertical upwards to extend respectively has a first plate body (23), highly being less than of first plate body (23) the height of wind-collecting plate (9) minimum, wind-collecting plate (7) set up in two between first plate body (23).

9. The axial flow fan of claim 8, wherein: the riser (6) with vertical board (5) one-to-one coplane, perpendicular to one of left side board (3) the lower extreme of riser (6) extends a second horizontal plate (24) towards the horizontal direction of another riser (6), the vertical downwardly extending second plate body (25) of tip of second horizontal plate (24), the height of the shortest department of second plate body (25) is higher than the height of wind-collecting dish (9) highest department, second plate body (25) and one that corresponds first plate body (23) coplane.

10. The axial flow fan of claim 9, wherein: use the air-out direction of fan blade (21) is the place ahead, left side board (3), the back side of right side board (4) is bent towards each other and is formed a spacing limit (26), each spacing limit (26) and roof (1), the board parallel and level of bottom plate (2) rear side, the rear side of roof (1) is provided with protection network (27), protection network (27) first plate body (23), second plate body (25), spacing limit (26) offset, protection network (27) fixed connection first plate body (23), second plate body (25), spacing limit (26), the upper and lower both sides of protection network (27) butt respectively second horizontal plate (24), first horizontal plate (22).