阅读说明：本技术 导流筒和工程机械 (Draft tube and engineering machinery ) 是由 王晨 黄建华 李海强 温玉霜 于 2019-12-05 设计创作，主要内容包括：本发明涉及工程机械领域,特别涉及一种导流筒和工程机械。本发明所提供的导流筒,包括：第一筒体；第二筒体,设置于第一筒体中；和多个第一导流板,多个第一导流板设置于第一筒体和第二筒体之间,并沿着第一筒体的周向间隔布置,相邻两个第一导流板之间形成导流通道,且第一导流板上设有导流孔,导流孔连通位于第一导流板两侧的导流通道。通过在第一导流板上设置连通两侧导流通道的导流孔,有利于改善气流的均匀性,实现更好的导流效果。(The invention relates to the field of engineering machinery, in particular to a guide cylinder and engineering machinery. The invention provides a guide shell, which comprises: a first cylinder; the second cylinder is arranged in the first cylinder; and the first guide plates are arranged between the first barrel and the second barrel and are arranged at intervals along the circumferential direction of the first barrel, a guide channel is formed between every two adjacent first guide plates, guide holes are formed in the first guide plates, and the guide holes are communicated with the guide channels positioned on two sides of the first guide plates. Through set up the water conservancy diversion hole of intercommunication both sides water conservancy diversion passageway on first guide plate, be favorable to improving the homogeneity of air current, realize better water conservancy diversion effect.)

1. A guide shell (3), comprising:

a first cylinder (31);

a second cylinder (32) provided in the first cylinder (31); and

a plurality of first guide plates (33), a plurality of first guide plates (33) set up in between first barrel (31) and second barrel (32), and along the circumference interval arrangement of first barrel (31), adjacent two form the water conservancy diversion passageway between first guide plate (33), just be equipped with water conservancy diversion hole (331) on first guide plate (33), water conservancy diversion hole (331) intercommunication is located the water conservancy diversion passageway of first guide plate (33) both sides.

2. The guide shell (3) of claim 1, wherein the first guide plate (33) comprises a first plate portion (33a) and a second plate portion (33b) which are sequentially connected from the inlet to the outlet of the first cylinder (31), the guide holes (331) are formed in the first plate portion (33a) and the second plate portion (33b), the number of the guide holes (331) in the first plate portion (33a) is greater than that of the guide holes (331) in the second plate portion (33b), and/or the diameter of the guide holes (331) in the first plate portion (33a) is greater than that of the guide holes (331) in the second plate portion (33 b).

3. The guide shell (3) of claim 2, wherein the first plate portion (33a) and/or the second plate portion (33b) is provided with at least two rows of guide holes (331) arranged in a radial direction of the first cylinder (31).

4. The guide shell (3) of claim 3, wherein the first plate portion (33a) is provided with 4-6 rows of guide holes (331) arranged along the radial direction of the first shell (31); and/or the second plate part (33b) is provided with 3-5 rows of diversion holes (331) which are radially arranged along the first cylinder (31).

5. The guide shell (3) of claim 3, wherein, of the at least two rows of guide holes (331) in the first plate portion (33a), a distance between the row of guide holes (331) farthest from the second cylinder (32) and an end of the first guide plate (33) far from the second cylinder (32) is 15-25 mm; and/or the distance between the guide hole (331) in the row farthest from the second cylinder (32) and the end of the first guide plate (33) far away from the second cylinder (32) in at least two rows of guide holes (331) on the second plate part (33b) is 35-55 mm.

6. Guide shell (3) according to claim 2, wherein on at least one of said first plate portion (33a) and said second plate portion (33b), the distance between the centers of two guide holes (331) axially adjacent along said first shell (31) is 20-35mm, and/or the distance between the centers of two guide holes (331) radially adjacent along said first shell (31) is 25-45 mm.

7. The guide shell (3) of claim 2, wherein the diameter of the guide hole (331) of the first plate portion (33a) is 1-1.5 times the diameter of the guide hole (331) of the second plate portion (33 b); and/or the center distance between the diversion hole (331) on the first plate part (33a) closest to the second plate part (33b) and the diversion hole (331) on the second plate part (33b) closest to the first plate part (33a) is 20-35 mm.

8. The guide shell (3) of claim 2, wherein the first guide plate (33) further comprises a third plate portion (33c), the third plate portion (33c) extends from the second plate portion (33b) to the outlet of the first cylinder (31), and the guide hole (331) is not provided in the third plate portion (33 c).

9. Guide shell (3) according to claim 1, characterized in that the first guide plate (33) is a flat or curved plate.

10. Guide shell (3) according to claim 9, characterized in that the first guide plate (33) is an S-shaped plate.

11. Guide shell (3) according to claim 10, characterized in that the first guide plate (33) is arranged symmetrically with respect to the diameter of the first cylinder (31) passing through the connection point of the first guide plate (33) with the second cylinder (32).

12. The guide shell (3) of any one of claims 1-11, wherein the guide shell (3) further comprises a second guide plate (34), the second guide plate (34) is disposed between the first cylinder (31) and the second cylinder (32) and close to the outlet of the first cylinder (31), and the second guide plate (34) and the first guide plate (33) are sequentially and alternately arranged along the circumference of the first cylinder (31).

13. Guide shell (3) according to one of claims 1 to 11, characterized in that the first cylinder (31) and/or the second cylinder (32) are in the shape of a circular truncated cone.

14. Guide shell (3) according to any one of claims 1 to 11, characterized in that at least one of the two axial ends of the second cylinder (32) is closed by a closing plate (35), the closing plate (35) having a hemispherical shape.

15. A working machine, characterized in that it comprises a guide shell (3) according to any of claims 1-14.

16. A working machine according to claim 15, characterized in that the working machine is a spraying machine.

Technical Field

The invention relates to the field of engineering machinery, in particular to a guide cylinder and engineering machinery.

Background

In engineering machinery such as a spraying machine and the like, a guide cylinder is arranged at the downstream of a fan and is mainly used for guiding airflow to flow.

Disclosure of Invention

The invention provides a guide shell with a better guide effect and an engineering machine with the guide shell.

The invention provides a guide shell, which comprises:

a first cylinder;

the second cylinder is arranged in the first cylinder; and

the first guide plates are arranged between the first barrel and the second barrel and are arranged at intervals along the circumferential direction of the first barrel, a guide channel is formed between every two adjacent first guide plates, guide holes are formed in the first guide plates, and the guide holes are communicated with the guide channels on two sides of the first guide plates.

In some embodiments, the first baffle comprises a first plate part and a second plate part which are sequentially connected from the inlet to the outlet of the first cylinder, wherein the first plate part and the second plate part are both provided with baffle holes, the number of the baffle holes on the first plate part is more than that of the baffle holes on the second plate part, and/or the diameter of the baffle holes on the first plate part is more than that of the baffle holes on the second plate part.

In some embodiments, at least two rows of the diversion holes are arranged on the first plate part and/or the second plate part along the radial direction of the first cylinder.

In some embodiments, the first plate part is provided with 4-6 rows of diversion holes arranged along the radial direction of the first cylinder; and/or the second plate part is provided with 3-5 rows of flow guide holes which are arranged along the radial direction of the first cylinder.

In some embodiments, the distance between the row of the diversion holes farthest from the second cylinder and the end of the first diversion plate far away from the second cylinder in the at least two rows of diversion holes on the first plate portion is 15-25 mm; and/or the distance between the one row of the diversion holes farthest from the second cylinder and one end of the first diversion plate far away from the second cylinder in at least two rows of diversion holes on the second plate part is 35-55 mm.

In some embodiments, a center distance between two baffle holes axially adjacent along the first barrel is 20-35mm and/or a center distance between two baffle holes radially adjacent along the first barrel is 25-45mm on at least one of the first plate portion and the second plate portion.

In some embodiments, the diameter of the diversion holes on the first plate portion is 1-1.5 times the diameter of the diversion holes on the second plate portion; and/or the center distance between the diversion hole on the first plate part closest to the second plate part and the diversion hole on the second plate part closest to the first plate part is 20-35 mm.

In some embodiments, the first baffle further comprises a third plate portion extending from the second plate portion to the outlet of the first cylinder, and the third plate portion is not provided with the baffle hole.

In some embodiments, the first baffle is a flat plate or a curved plate.

In some embodiments, the first baffle is an S-shaped plate.

In some embodiments, the first baffle is symmetrically disposed about a diameter of the first cylinder passing through a connection point of the first baffle to the second cylinder.

In some embodiments, the guide cylinder further comprises a second guide plate, the second guide plate is arranged between the first cylinder and the second cylinder and close to the outlet of the first cylinder, and the second guide plate and the first guide plate are sequentially and alternately arranged along the circumferential direction of the first cylinder.

In some embodiments, the first cylinder and/or the second cylinder are in the shape of a truncated cone.

In some embodiments, at least one of the axial ends of the second cylinder is closed by a sealing plate, the sealing plate being hemispherical.

The engineering machine provided by the invention comprises the guide cylinder.

In some embodiments, the work machine is a sprayer.

Through set up the water conservancy diversion hole of intercommunication both sides water conservancy diversion passageway on first guide plate, be favorable to improving the homogeneity of air current, realize better water conservancy diversion effect.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

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 shows a schematic structural diagram of a spraying device of a sprayer provided by the invention.

Fig. 2 shows a schematic view of the internal structure of the guide shell of fig. 1.

Fig. 3 shows a left side view of the guide shell of fig. 1.

Fig. 4 shows a schematic view of the first baffle of fig. 2.

Fig. 5 shows a schematic structure of the guide shell when the first guide plate is an S-shaped plate.

In the figure:

1. a current collector;

2. a fan device;

3. a draft tube; 31. a first cylinder; 32. a second cylinder; 33. a first baffle; 331. a flow guide hole; 33a, a first plate portion; 33b, a second plate portion; 33c, a third plate portion; 34. a second baffle; 35. closing the plate;

4. a nozzle arrangement.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

In the description of the present invention, it should be understood that the terms "first", "second", etc. are used to define the components, and are used only for the convenience of distinguishing the corresponding components, and if not otherwise stated, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present invention.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The guide shell 3 of the present invention is applicable to various construction machines, but for convenience of description, the following description will be given only by taking a spraying machine as an example.

The sprayer is a dust suppression device, generally, water is dispersed into mist by a spraying device and sprayed into the air, dust clusters are formed by collision, adsorption and condensation of the water mist and dust in the air, and the formed dust clusters fall under the action of gravity, so that the purposes of dust suppression and dust reduction are achieved.

The air-assisted sprayer is one of the sprayers, and referring to fig. 1, the spraying device generally comprises an air-assisted device and a nozzle device 4, wherein the air-assisted device is connected to the upstream of the spraying device 4 along the flowing direction of the air flow and is used for providing the air flow and spraying water drops sprayed from the nozzle device 4 into the air so as to increase the spraying distance of the water mist.

Referring to fig. 1, the air supply device includes a current collector 1, a fan device 2, a guide cylinder 3, and the like, the current collector 1, the fan device 2, and the guide cylinder 3 are sequentially arranged along the airflow direction, and the three are coaxially welded or connected by a flange, and the like.

When the dust-settling device works, under the action of the fan device 2, airflow enters the guide cylinder 3 through the flow collector 1, flows out of the outlet of the guide cylinder 3 at a high speed under the guiding action of the guide cylinder 3, is contacted with water mist sprayed out of the nozzle device 4 at the outlet of the guide cylinder 3, and is conveyed to a remote place to perform dust-settling operation.

According to the working process, the flow guide effect of the flow guide cylinder 3 directly influences the dust suppression effect and the dust suppression efficiency of the sprayer. For example, if the axial velocity of the air flow flowing out of the guide cylinder 3 is low and the air flow distance of the guide cylinder 3 is short, the mist cannot obtain the velocity in the axial direction to the maximum extent and easily falls to the ground within a short distance, and at this time, the water droplets stay in the air for a short time and are not sufficiently in contact with dust in the air, so that the dustfall effect is poor and the dustfall efficiency is low.

In order to improve the flow guide effect of the flow guide cylinder 3, further improve the dust suppression effect of the spraying machine and improve the dust suppression efficiency of the spraying machine, the structure of the flow guide cylinder 3 is improved.

Fig. 1 to 5 show an exemplary configuration of the guide shell 3 according to the invention.

Referring to fig. 1 to 5, the guide shell 3 provided by the present invention includes:

a first cylinder 31;

a second cylinder 32 disposed in the first cylinder 31; and

the first guide plates 33 are arranged between the first cylinder 31 and the second cylinder 32 and are circumferentially spaced along the first cylinder 31, a guide channel is formed between two adjacent first guide plates 33, guide holes 331 are formed in the first guide plates 33, and the guide holes 331 are communicated with the guide channels on two sides of the first guide plates 33.

The guide holes 331 which are communicated with the guide channels on the two sides of the first guide plate 33 are arranged on the first guide plate 33, so that the air flow with uneven speed and/or pressure on the two sides of the first guide plate 33 can be compensated by the guide holes 331, because at the moment, the speed gradient of the air flow is reduced in the process of flowing through the guide cylinder 3, turbulence pulsation is reduced, and energy loss is reduced, therefore, compared with the condition that the guide channels on the two sides of the first guide plate 33 are not communicated by the guide holes 331, the guide effect of the guide cylinder 3 can be effectively improved, the axial speed of the air flow at the outlet of the guide cylinder 3 is increased, the air delivery distance of the guide cylinder 3 is increased, the dust suppression effect of the sprayer is effectively improved, and the dust suppression efficiency of the.

In addition, due to the effect of the diversion holes 331, rapid balance of the non-uniform airflow can be achieved, so that a flow field with uniform speed flowing along the axial direction is formed at the outlet of the diversion cylinder 3 (i.e. the outlet of the first cylinder 31), and therefore, the impact of the high-speed airflow on the first diversion plate 33 can be reduced, and the noise intensity of the diversion cylinder 3 during operation is further reduced.

As can be seen, based on the flow guide holes 331, the flow guide cylinder 3 of the present invention can realize a long-distance and low-noise air supply process.

Referring to fig. 2 and 4, in some embodiments, the first flow guiding plate 33 includes a first plate portion 33a and a second plate portion 33b sequentially connected from the inlet to the outlet of the first cylinder 31, flow guiding holes 331 are formed in both the first plate portion 33a and the second plate portion 33b, the number of flow guiding holes 331 in the first plate portion 33a is greater than the number of flow guiding holes 331 in the second plate portion 33b, and/or the diameter of the flow guiding holes 331 in the first plate portion 33a is greater than the diameter of the flow guiding holes 331 in the second plate portion 33 b. Based on this, the diversion holes 331 are not uniformly distributed on the first diversion plate 33, but are distributed from at least more along the airflow flowing direction and/or from large to small, which makes the current conversion effect of the first diversion plate 33 from strong to weak and the rectification effect from weak to strong in the airflow flowing direction, and because the first diversion plate 33 at this time provides more targeted current conversion and rectification effects for the airflow according to different characteristics and different requirements of the airflow in the flowing process, thereby facilitating more fully utilizing the energy of the airflow and realizing a more low-noise and stable remote air delivery process.

The flow guiding holes 331 on the first plate portion 33a are larger in number and/or larger in diameter, so that a more sufficient commutation effect can be achieved, and therefore, the area corresponding to the first plate portion 33a may be referred to as a strong commutation area.

And the flow guiding holes 331 of the second plate portion 33b are smaller in number and/or smaller in diameter, the commutation function is weakened while the commutation function is strengthened, and therefore, the area corresponding to the second plate portion 33 may be referred to as a weak commutation area.

Further, referring to fig. 2 and 4, in some embodiments, the first baffle 33 further includes a third plate portion 33c in addition to the first plate portion 33a and the second plate portion 33b, the third plate portion 33c extends from the second plate portion 33b to the outlet of the first cylinder 31, and the baffle hole 331 is not provided in the third plate portion 33 c. Thus, the first flow guiding plate 33 not only has a strong flow conversion area corresponding to the first plate portion 33a and a weak flow conversion area corresponding to the second plate portion 33b, but also has a flow conversion area corresponding to the third plate portion 33c, so that the airflow can successively undergo strong flow conversion and strong flow conversion in the process of flowing through the flow guiding cylinder 3, thereby not only improving the uniformity of the outlet airflow and reducing the impact noise of the airflow, but also obtaining the outlet airflow with a more consistent direction with the required airflow.

In addition, referring to fig. 2 and 3, in some embodiments, the guide cylinder 3 further includes a second guide plate 34 on the basis of the first guide plate 33, the second guide plate 34 is disposed between the first cylinder 31 and the second cylinder 32 and near the outlet of the first cylinder 31, and the second guide plate 34 and the first guide plate 33 are sequentially and alternately arranged along the circumferential direction of the first cylinder 31.

Based on above-mentioned setting, second guide plate 34 can cooperate with first guide plate 33, carries out the rectification to the air current better before airflow outflow draft tube 3, obtains more even stable exhaust air current.

The embodiments shown in fig. 1-5 are further described below.

The embodiment shown in fig. 1-4 will first be described.

As shown in fig. 1, in this embodiment, a guide cylinder 3 is disposed between the fan device 2 and the nozzle device 4 for guiding the air flow flowing in by the fan device 2 to the nozzle device 4 to deliver the water mist sprayed from the nozzle device 4.

Wherein the fan device 2 comprises an axial fan. The nozzle device 4 is configured as a nozzle ring, comprising a support ring and a plurality of nozzles arranged on the support ring.

As shown in fig. 2, the guide cylinder 3 includes a first cylinder 31, a second cylinder 32, a first guide plate 33, a second guide plate 34, and a sealing plate 35.

The first cylinder 31 is sleeved outside the second cylinder 32 to form a shell of the draft tube 3. Specifically, a hollow cavity with two open ends is arranged in the first cylinder 31, and two open ends of the hollow cavity are respectively connected with the blower device 2 and the nozzle device 4 and used as an inlet and an outlet of the first cylinder 31, that is, as an inlet and an outlet of the guide cylinder 3. As can be seen from fig. 1 and 2, in this embodiment, the first cylinder 31 has a truncated cone shape and gradually narrows from the inlet to the outlet.

The second cylinder 32 is disposed in the hollow chamber of the first cylinder 31 and is coaxially arranged with the first cylinder 31. Between the outer wall of the second cylinder 32 and the inner wall of the first cylinder 31, an installation space of a first guide plate 33 and a second guide plate 34 is formed. As can be seen from fig. 1 and 2, in this embodiment, the second cylinder 32 is also in a truncated cone shape, and the taper of the second cylinder 32 is identical to that of the first cylinder 31. Meanwhile, both axial ends of the second cylinder 32 are closed by the closing plates 35, and the closing plates 35 are hemispherical.

The first cylinder 31 and the second cylinder 32 which are in the truncated cone-shaped structure can play a certain role in rectifying. The shape characteristics that the first cylinder 31 and the second cylinder 32 are gradually narrowed along the airflow direction are beneficial to guiding the airflow to converge towards the center of the guide shell 3 when the airflow flows out. Alternatively, only one of the first cylinder 31 and the second cylinder 32 may have a truncated cone shape.

The hemispherical seal plates 35 disposed at the two axial ends of the second cylinder 32 are favorable for improving the air flow and reducing the air flow resistance. In other embodiments, the sealing plate 35 may be provided in a hemispherical shape at only one of the two axial ends of the second cylinder 32.

The first guide plate 33 and the second guide plate 34 are disposed between the first cylinder 31 and the second cylinder 32, and are used for guiding the airflow during the airflow flowing through the guide cylinder 3.

As shown in fig. 2 and 4, in this embodiment, 6 to 10 first baffles 33 are arranged at intervals along the circumference of the first cylinder 31, so that a flow guide channel is formed between two adjacent first baffles 33. The air flow from the fan device 2 into the guide shell 3 is dispersed into each guide channel and flows to the nozzle device 4 along each guide channel.

As can be seen from fig. 2 and 4, in this embodiment, each first baffle 33 has the same structure, extends from the second cylinder 32 to the first cylinder 31, and includes a first plate 33a, a second plate 33b, and a third plate 33c connected in sequence along the airflow direction. The first plate part 33a and the second plate part 33b are both provided with a diversion hole 331 penetrating the first diversion plate 33 along the thickness direction of the first diversion plate 33, the third plate part 33c is not provided with the diversion hole 331, and the number and the aperture of the diversion holes 331 on the first plate part 33a are larger than those of the diversion holes 331 on the second plate part 33b, so that the first diversion plate 33 is divided into three areas according to functions, namely a strong flow change area close to the fan device 2 corresponding to the first plate part 33a, a weak flow change area in the middle corresponding to the second plate part 33b, and a flow change area close to the outlet of the diversion cylinder 3 corresponding to the third plate part 33 c.

Because the diversion hole 331 runs through the first diversion plate 33 that separates two adjacent diversion channels along the thickness direction of first diversion plate 33, consequently, diversion hole 331 can communicate two diversion channels that are located same first diversion plate 33 both sides, make the air current in two adjacent diversion channels distribute inhomogeneously, when having speed and pressure differential, can compensate each other, reduce the velocity gradient, reduce the turbulence pulsation, reduce energy loss, thereby effectively alleviate the inhomogeneity of export wind speed, increase the axial velocity of export air current, and reduce the produced noise intensity of air current striking.

During operation, the uneven airflow flowing out of the fan device 2 firstly flows through the strong flow change area at the first plate portion 33a, flows forward along the axial direction, and simultaneously flows in the circumferential direction through the flow guide hole 331 on the first plate portion 33a, so as to compensate each other, so that preliminary balance of the uneven airflow is rapidly realized, then the airflow enters the weak flow change area at the second plate portion 33b, the uneven airflow is further balanced by the second plate portion 33b, meanwhile, the second plate portion 33b also plays a certain role in rectification, finally, the airflow flows through the rectification area at the third plate portion 33c, and flows out of the flow guide cylinder 3 stably and with low noise after being further rectified by the third plate portion 33 c.

In the embodiment, as shown in fig. 4, a plurality of circular diversion holes 331 are formed in the first plate portion 33a and the second plate portion 33b, the diameter of each diversion hole 331 in the first plate portion 33a is the same, the diameter of each diversion hole 331 in the second plate portion 33b is the same, and the diameter of each diversion hole 331 in the first plate portion 33a is the same

The diameter of the flow guiding hole 331 on the second plate portion 33b

1-1.5 times of the total weight of the composition.

In addition, in this embodiment, the distribution of the flow guide holes 331 on the first plate portion 33a and the second plate portion 33b is different.

As shown in fig. 4, in this embodiment, on the first plate portion 33a, the center distance a1 between two flow guide holes 331 adjacent in the axial direction of the first barrel 31 is 20 to 35 mm; meanwhile, the center distance b1 between two guide holes 331 adjacent in the radial direction of the first barrel 31 is 25-45 mm. In addition, the guide holes 331 on the first plate portion 33a are arranged in at least two rows (for example, 4 to 6 rows) arranged in the radial direction of the first cylinder 31, and among the at least two rows of guide holes 331, the row of guide holes 331 farthest from the second cylinder 32 is 15 to 25mm from the end of the first guide plate 33 far from the second cylinder 32, that is, in fig. 4, the distance c1 between the uppermost row of guide holes 331 and the top end of the first guide plate 33 is 15 to 25 mm.

On the second plate part 33b, the center distance a2 between two flow guide holes 331 adjacent in the axial direction of the first cylinder 31 is 20-35 mm; meanwhile, the center distance b2 between two guide holes 331 adjacent in the radial direction of the first barrel 31 is 25-45 mm. In addition, the guide holes 331 on the second plate portion 33b are arranged in at least two rows (for example, 3 to 5 rows) arranged in the radial direction of the first cylinder 31, and among the at least two rows of guide holes 331, the row of guide holes 331 farthest from the second cylinder 32 is 35 to 55mm from the end of the first guide plate 33 far from the second cylinder 32, that is, in fig. 4, the distance c2 between the uppermost row of guide holes 331 and the top end of the first guide plate 33 is 35 to 55 mm.

Specifically, as can be seen from fig. 4, in this embodiment, 24 flow guide holes 331 are provided in the first plate portion 33a, the 24 flow guide holes 331 are arranged in a matrix of 4 rows and 6 columns, and 15 flow guide holes 331 are provided in the second plate portion 33b, the 15 flow guide holes 331 are arranged in a matrix of 3 rows and 5 columns. Further, on the first plate portion 33a and the second plate portion 33b, the row pitch (b1 and b2) and the column pitch (a1 and a2) are each 20 to 35mm and 25 to 45mm, respectively. The center distance d between the guide hole 331 of the first plate portion 33a closest to the second plate portion 33b and the guide hole 331 of the second plate portion 33b closest to the first plate portion 33a is 20 to 35 mm. Meanwhile, the distance c1 from the top of the first plate 33a to the top of the first plate 33a is 15-25mm for the uppermost row of the guide holes 331 on the first plate 33a, and the distance c2 from the top of the second plate 33b is 35-55mm for the uppermost row of the guide holes 331 on the second plate 33 b.

Based on the above arrangement, the number of the flow guiding holes 331 on the first plate portion 33a is greater than the number of the flow guiding holes 331 on the second plate portion 33b, and the aperture of the flow guiding holes 331 on the first plate portion 33a is greater than the aperture of the flow guiding holes 331 on the second plate portion 33b, so that the first plate portion 33a can achieve a more rapid and sufficient commutation process compared with the second plate portion 33b, and the second plate portion 33b can have both a commutation function and a rectification function, so that the first flow guiding plate 33 can better adapt to the flow characteristics of the air flow, the air flow energy generated by the axial flow fan is more fully utilized, and a more low-noise and stable remote air supply process is achieved. In addition, the size and distribution parameters of the diversion holes 331 on the first plate portion 33a and the second plate portion 33b are more consistent with the distribution characteristics of the airflow pressure difference at the two sides of the first diversion plate 33, which is beneficial to more fully increasing the speed and reducing the noise.

As shown in fig. 2 and 3, in this embodiment, the second baffle 34 is not provided with baffle holes 331 which are alternately arranged in sequence with the first baffles 33 in the circumferential direction and correspond to the positions of the third plate portions 33c in the axial direction. Thus, the second guide plate 34 can play a role in strengthening rectification, and is matched with the first guide plate 33, particularly matched with the third plate part 33c, so that outlet airflow is fully rectified, and a more uniform and stable airflow discharge process is realized.

It can be seen that, in the first embodiment, the diversion holes 331 are formed in the first diversion plate 33, so that uneven high-speed air flows can compensate each other through the diversion holes 331, and a flow field with uniform speed flowing along the axial direction is formed at the outlet of the diversion cylinder 3, thereby greatly increasing the air delivery distance of the diversion cylinder 3 and reducing the impact noise of the air flows.

In the embodiment shown in fig. 1 to 4, the first flow guiding plate 33 is a flat plate, but in other embodiments, the first flow guiding plate 33 may also be a curved plate, so as to increase the contact area between the first flow guiding plate 33 and the airflow, and further improve the flow equalizing and speed increasing effect.

Fig. 5 shows an embodiment in which the first baffle 33 is a curved plate.

As shown in fig. 5, in this embodiment, the first baffle 33 is not a flat plate but an S-shaped plate, and the first baffle 33, which is an S-shaped plate, is arranged symmetrically with respect to the diameter of the first cylinder 31 passing through the connection point of the first baffle 33 and the second cylinder 32.

Specifically, as shown in fig. 5, on the cross section of the guide cylinder 3, an intersection point of the first guide plate 33 and the first cylinder 31 is a, an intersection point of the first guide plate and the second cylinder 32 is B, an intersection point of the first guide plate and the diameter of the first cylinder 31 passing through the point B is C, A, B, C is collinear, the length of the AC straight line segment is equal to that of the BC straight line segment, the protruding direction of the AC section curve is consistent with the rotation direction of the axial flow fan, the protruding direction of the BC section curve is opposite to that of the AC section curve, and meanwhile, the maximum distance L2 between the AC section curve and the AC section straight line and the maximum distance L1 between the BC section curve and the BC section straight line are equal to each other and are 1/20-1/10 of the diameter of the axial flow fan.

Based on the above arrangement, the first guide plate 33 is more adapted to the characteristics of the air flow provided by the axial flow fan, and can provide a larger slow release space for the air flow with higher air speed at the outer side, thereby more effectively improving the air outlet stability.

The above description is only exemplary of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.