Guide tube and construction machinery

Abstract

The present invention relates to the field of engineering machinery, and in particular to a guide tube and engineering machinery. The guide tube provided by the present invention comprises: a first cylinder; a second cylinder, which is arranged in the first cylinder; and a plurality of first guide plates, which are arranged between the first cylinder and the second cylinder and arranged at intervals along the circumference of the first cylinder, and a guide channel is formed between two adjacent first guide plates, and a guide hole is provided on the first guide plate, and the guide hole connects the guide channels located on both sides of the first guide plate. By providing a guide hole connecting the guide channels on both sides on the first guide plate, it is beneficial to improve the uniformity of the airflow and achieve a better guide effect.

Description

Technical Field

[0001] The invention relates to the field of engineering machinery, and in particular to a guide tube and engineering machinery. Background Art

[0002] In construction machinery such as sprayers, the guide tube is set downstream of the fan and is mainly used to guide the air flow.

[0003] In the related art, the guide tube includes a first cylinder, a second cylinder arranged in the first cylinder, and a guide plate arranged between the first cylinder and the second cylinder. A plurality of guide plates are arranged at intervals along the circumference of the first cylinder, and a guide channel is formed between two adjacent guide plates, and the guide plates isolate the guide channels on both sides. The guide effect of this guide tube is limited, the air energy loss is large, the air delivery distance is short, and the working performance of the engineering machinery is affected (for example, the spraying ability and dust suppression performance of the sprayer), and the high-speed airflow blowing on the guide plate is easy to cause vibration and increase noise. Summary of the invention

[0004] The invention provides a guide tube with better guide effect and an engineering machine with the guide tube.

[0005] The guide tube provided by the present invention comprises:

[0006] A first cylinder;

[0007] A second cylinder is disposed in the first cylinder; and

[0008] Multiple first guide plates are arranged between the first cylinder and the second cylinder, and are arranged at intervals along the circumference of the first cylinder. A guide channel is formed between two adjacent first guide plates, and guide holes are provided on the first guide plates, which connect the guide channels on both sides of the first guide plates.

[0009] In some embodiments, the first guide plate includes a first plate portion and a second plate portion connected in sequence from the inlet to the outlet direction of the first cylinder, and the first plate portion and the second plate portion are both provided with guide holes, and the number of guide holes on the first plate portion is greater than the number of guide holes on the second plate portion, and / or the aperture of the guide holes on the first plate portion is greater than the aperture of the guide holes on the second plate portion.

[0010] In some embodiments, at least two rows of guide holes are provided on the first plate portion and / or the second plate portion and are arranged radially along the first cylinder.

[0011] In some embodiments, the first plate portion is provided with 4-6 rows of guide holes arranged radially along the first cylinder; and / or, the second plate portion is provided with 3-5 rows of guide holes arranged radially along the first cylinder.

[0012] In some embodiments, among the at least two rows of guide holes on the first plate portion, the distance between the row of guide holes farthest from the second cylinder and the end of the first guide plate away from the second cylinder is 15-25 mm; and / or, among the at least two rows of guide holes on the second plate portion, the distance between the row of guide holes farthest from the second cylinder and the end of the first guide plate away from the second cylinder is 35-55 mm.

[0013] In some embodiments, on at least one of the first plate portion and the second plate portion, the center distance between two axially adjacent guide holes along the first cylinder is 20-35 mm, and / or the center distance between two radially adjacent guide holes along the first cylinder is 25-45 mm.

[0014] In some embodiments, the aperture of the guide hole on the first plate portion is 1-1.5 times the aperture of the guide hole on the second plate portion; and / or, the center distance between the guide hole on the first plate portion closest to the second plate portion and the guide hole on the second plate portion closest to the first plate portion is 20-35 mm.

[0015] In some embodiments, the first guide plate further includes a third plate portion, the third plate portion extends from the second plate portion toward the outlet of the first cylinder, and no guide hole is provided on the third plate portion.

[0016] In some embodiments, the first guide plate is a flat plate or a curved plate.

[0017] In some embodiments, the first guide plate is an S-shaped plate.

[0018] In some embodiments, the first guide plates are symmetrically arranged with respect to a diameter of the first cylinder passing through a connection point between the first guide plates and the second cylinder.

[0019] In some embodiments, the guide tube further includes a second guide plate, which is disposed between the first tube body and the second tube body and close to the outlet of the first tube body, and the second guide plate and the first guide plate are alternately arranged in sequence along the circumference of the first tube body.

[0020] In some embodiments, the first cylinder and / or the second cylinder is in a truncated cone shape.

[0021] In some embodiments, at least one of the two axial ends of the second cylinder is closed by a sealing plate, and the sealing plate is hemispherical.

[0022] The engineering machinery provided by the present invention comprises the guide tube of the present invention.

[0023] In some embodiments, the construction machine is a sprayer.

[0024] By providing guide holes connecting the guide channels on both sides on the first guide plate, it is beneficial to improve the uniformity of the airflow and achieve a better guide effect.

[0025] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 The schematic diagram of the structure of the spray device of the spray machine provided by the present invention is shown.

[0028] Figure 2 Show Figure 1 Schematic diagram of the internal structure of the middle guide tube.

[0029] Figure 3 Show Figure 1 Left view of the center guide tube.

[0030] Figure 4 Show Figure 2 Schematic diagram of the structure of the first guide plate.

[0031] Figure 5 A simplified structural diagram of the guide tube is shown when the first guide plate is an S-shaped plate.

[0032] In the figure:

[0033] 1. Current collector;

[0034] 2. Fan device;

[0035] 3. guide tube; 31. first cylinder; 32. second cylinder; 33. first guide plate; 331. guide hole; 33a. first plate portion; 33b. second plate portion; 33c. third plate portion; 34. second guide plate; 35. sealing plate;

[0036] 4. Nozzle device. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without carrying out creative work are within the scope of protection of the present invention.

[0038] Technologies, methods, and apparatus known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, such technologies, methods, and apparatus should be considered part of the authorization specification.

[0039] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0040] In the description of the present invention, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0041] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] The guide tube 3 of the present invention is applicable to various engineering machines, but for the convenience of description, only a sprayer is used as an example for explanation below.

[0043] A sprayer is a dust suppression device, which generally disperses water into mist through a spray device and sprays it into the air. The water mist collides, adsorbs and condenses with the dust in the air to form dust clumps, which fall under the action of gravity, thereby achieving the purpose of dust suppression and reduction.

[0044] Air-assisted sprayer is a type of sprayer. Figure 1The spray device generally includes an air delivery device and a nozzle device 4. Along the flow direction of the air flow, the air delivery device is connected to the upstream of the spray follower device 4 to provide air flow to blow the water droplets sprayed by the nozzle device 4 into the air to increase the spray distance of the water mist.

[0045] Reference Figure 1 The air delivery device includes a collector 1, a fan device 2 and a guide tube 3, etc. The collector 1, the fan device 2 and the guide tube 3 are arranged in sequence along the air flow direction, and the three are coaxially welded or connected by flanges.

[0046] During operation, under the action of the fan device 2, the air flow enters the guide tube 3 from the collector 1, and flows out at high speed from the outlet of the guide tube 3 under the guidance of the guide tube 3, and contacts the water mist sprayed by the nozzle device 4 at the outlet of the guide tube 3, and transports the water mist to a distant place to perform dust reduction operations.

[0047] It can be seen from the above working process that the guiding effect of the guide tube 3 will directly affect the dust suppression effect and efficiency of the sprayer. For example, if the axial velocity of the airflow flowing out of the guide tube 3 is low and the air delivery distance of the guide tube 3 is short, the water mist cannot obtain the maximum axial velocity and is easy to fall to the ground within a short distance. Since the water droplets stay in the air for a short time at this time, they are not in sufficient contact with the dust in the air, so the dust suppression effect is poor and the dust suppression efficiency is low.

[0048] In order to improve the flow guiding effect of the flow guide tube 3 , and further improve the dust suppression effect of the sprayer, and enhance the dust suppression efficiency of the sprayer, the present invention improves the structure of the flow guide tube 3 .

[0049] Figure 1-5 The structure of the guide tube 3 of the present invention is shown as an example.

[0050] Reference Figure 1-5 The guide tube 3 provided by the present invention includes:

[0051] A first cylinder 31;

[0052] The second cylinder 32 is disposed in the first cylinder 31; and

[0053] A plurality of first guide plates 33 are provided between the first cylinder 31 and the second cylinder 32 and are arranged at intervals along the circumference of the first cylinder 31. A guide channel is formed between two adjacent first guide plates 33, and a guide hole 331 is provided on the first guide plate 33. The guide hole 331 connects the guide channels on both sides of the first guide plate 33.

[0054] By providing guide holes 331 on the first guide plate 33 that are connected to the guide channels on both sides of the first guide plate 33, the airflows with uneven speed and / or pressure on both sides of the first guide plate 33 can compensate each other through the guide holes 331. At this time, when the airflow passes through the guide tube 3, the velocity gradient becomes smaller, the turbulent pulsation becomes less, and the energy loss is reduced. Therefore, compared with the situation where the guide channels on both sides of the first guide plate 33 are not connected by the guide holes 331, the guide effect of the guide tube 3 can be effectively improved, the axial speed of the airflow at the outlet of the guide tube 3 is increased, and the wind delivery distance of the guide tube 3 is increased, thereby effectively improving the dust suppression effect of the sprayer and improving the dust suppression efficiency of the sprayer.

[0055] Moreover, due to the action of the guide hole 331, the uneven airflow can be quickly balanced, so that a flow field with uniform axial flow velocity is formed at the outlet of the guide tube 3 (i.e., the outlet of the first cylinder 31). Therefore, the impact of the high-speed airflow on the first guide plate 33 can be reduced, thereby reducing the noise intensity of the guide tube 3 when it is working.

[0056] It can be seen that, based on the provided guide holes 331 , the guide tube 3 of the present invention can realize a long-distance and low-noise air delivery process.

[0057] Reference Figure 2 and Figure 4 In some embodiments, the first guide plate 33 includes a first plate portion 33a and a second plate portion 33b connected in sequence from the inlet to the outlet direction of the first cylinder 31, and the first plate portion 33a and the second plate portion 33b are both provided with guide holes 331, and the number of guide holes 331 on the first plate portion 33a is greater than the number of guide holes 331 on the second plate portion 33b, and / or the aperture of the guide hole 331 on the first plate portion 33a is greater than the aperture of the guide hole 331 on the second plate portion 33b. Based on this, the guide holes 331 are not evenly distributed on the first guide plate 33, but are distributed from more to less, and / or from large to small along the airflow direction. This makes the commutation effect of the first guide plate 33 change from strong to weak, and the rectification effect changes from weak to strong in the airflow outflow direction. At this time, the first guide plate 33 provides more targeted commutation and rectification effects for the airflow according to the different characteristics and different requirements of the airflow in the flow process. Therefore, it is beneficial to make fuller use of the energy of the airflow and achieve a more low-noise and stable long-distance wind delivery process.

[0058] Among them, the number of guide holes 331 on the first plate portion 33a is large and / or the hole diameter is large, which can achieve a more sufficient commutation effect. Therefore, the area corresponding to the first plate portion 33a can be called a strong commutation area.

[0059] However, the number of the guide holes 331 on the second plate portion 33b is small and / or the aperture is small, so the commutation effect is weakened and the rectification effect is enhanced. Therefore, the area corresponding to the second plate portion 33 can be called a weak commutation area.

[0060] And, refer to Figure 2 and Figure 4 In some embodiments, on the basis of the first plate portion 33a and the second plate portion 33b, the first guide plate 33 further includes a third plate portion 33c, which extends from the second plate portion 33b to the outlet of the first cylinder 31, and the third plate portion 33c is not provided with a guide hole 331. In this way, the first guide plate 33 not only has a strong commutation area corresponding to the first plate portion 33a and a weak commutation area corresponding to the second plate portion 33b, but also has a rectification area corresponding to the third plate portion 33c, so that the airflow can successively experience strong commutation and strong rectification in the process of flowing through the guide cylinder 3, thereby not only improving the uniformity of the outlet airflow and reducing the airflow impact noise, but also obtaining an outlet airflow that is more consistent with the required airflow direction.

[0061] In addition, refer to Figure 2 and Figure 3 In some embodiments, the guide tube 3 includes a second guide plate 34 in addition to the first guide plate 33. The second guide plate 34 is arranged between the first cylinder 31 and the second cylinder 32 and close to the outlet of the first cylinder 31. The second guide plate 34 and the first guide plate 33 are arranged alternately in sequence along the circumference of the first cylinder 31.

[0062] Based on the above arrangement, the second guide plate 34 can cooperate with the first guide plate 33 to better rectify the airflow before it flows out of the guide tube 3, thereby obtaining a more uniform and stable exhaust airflow.

[0063] Below Figure 1-5 The illustrated embodiment is further described.

[0064] First of all Figure 1-4 The embodiment shown is explained.

[0065] like Figure 1 As shown, in this embodiment, the guide tube 3 is arranged between the fan device 2 and the nozzle device 4, and is used to guide the airflow flowing in under the action of the fan device 2 to flow to the nozzle device 4, so as to transport the water mist sprayed by the nozzle device 4.

[0066] The fan device 2 includes an axial flow fan. The nozzle device 4 is configured as a nozzle ring, including a support ring and a plurality of nozzles arranged on the support ring.

[0067] like Figure 2As shown, the guide cylinder 3 includes a first cylinder body 31 , a second cylinder body 32 , a first guide plate 33 , a second guide plate 34 and a sealing plate 35 .

[0068] The first cylinder 31 is sleeved on the outside of the second cylinder 32 to form the outer shell of the guide cylinder 3. Specifically, a hollow chamber with two ends open is provided in the first cylinder 31. The two ends of the hollow chamber are respectively connected to the fan device 2 and the nozzle device 4, which serve as the inlet and outlet of the first cylinder 31, that is, the inlet and outlet of the guide cylinder 3. Figure 1 and Figure 2 It can be seen that in this embodiment, the first cylinder 31 is in a truncated cone shape and gradually narrows from the inlet to the outlet.

[0069] 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, a mounting space for the first guide plate 33 and the second guide plate 34 is formed. Figure 1 and Figure 2 It can be seen that in this embodiment, the second cylinder 32 is also truncated cone-shaped, and the taper of the second cylinder 32 is consistent with that of the first cylinder 31. At the same time, both axial ends of the second cylinder 32 are closed by the sealing plate 35, and the sealing plate 35 is hemispherical.

[0070] The first cylinder 31 and the second cylinder 32 in a truncated cone structure can play a certain role in rectifying the flow. The shape characteristics of the first cylinder 31 and the second cylinder 32 gradually narrowing along the flow direction of the airflow are conducive to guiding the airflow to converge at the center of the guide cylinder 3 when it flows out. As an alternative, only one of the first cylinder 31 and the second cylinder 32 can be truncated cone-shaped.

[0071] The hemispherical sealing plates 35 disposed at both axial ends of the second cylinder 32 are beneficial to improving airflow and reducing airflow resistance. In other embodiments, the hemispherical sealing plates 35 may be disposed at only one of the two axial ends of the second cylinder 32 .

[0072] The first guide plate 33 and the second guide plate 34 are both disposed between the first cylinder 31 and the second cylinder 32 , and are used to guide the airflow when the airflow passes through the guide cylinder 3 .

[0073] like Figure 2 and Figure 4 As shown, in this embodiment, 6-10 first guide plates 33 are arranged at intervals along the circumference of the first cylinder 31, so that a guide channel is formed between two adjacent first guide plates 33. The airflow flowing into the guide cylinder 3 from the fan device 2 is dispersed into each guide channel and flows toward the nozzle device 4 along each guide channel.

[0074] Depend on Figure 2 and Figure 4It can be seen that in this embodiment, each first guide plate 33 has the same structure, extends from the second cylinder 32 to the first cylinder 31, and includes a first plate portion 33a, a second plate portion 33b, and a third plate portion 33c connected in sequence along the airflow direction. The first plate portion 33a and the second plate portion 33b are both provided with guide holes 331 penetrating the first guide plate 33 along the thickness direction of the first guide plate 33, while the third plate portion 33c is not provided with guide holes 331, and the number and aperture of the guide holes 331 on the first plate portion 33a are greater than the guide holes 331 on the second plate portion 33b, so that the first guide plate 33 is divided into three areas according to its function, namely, a strong commutation area close to the fan device 2 corresponding to the first plate portion 33a, a weak commutation area in the middle corresponding to the second plate portion 33b, and a rectification area close to the outlet of the guide cylinder 3 corresponding to the third plate portion 33c.

[0075] Since the guide hole 331 penetrates the first guide plate 33 separating two adjacent guide channels along the thickness direction of the first guide plate 33, the guide hole 331 can connect the two guide channels located on both sides of the same first guide plate 33, so that the airflow in the two adjacent guide channels can compensate each other when the distribution is uneven and there is a speed and pressure difference, thereby reducing the velocity gradient, reducing turbulent pulsation, and reducing energy loss, thereby effectively reducing the unevenness of the outlet wind speed, increasing the axial speed of the outlet airflow, and reducing the noise intensity generated by the airflow impact.

[0076] During operation, the uneven airflow flowing out of the fan device 2 first flows through the strong exchange area at the first plate portion 33a, and while flowing forward in the axial direction, forms a circumferential flow through the guide holes 331 on the first plate portion 33a, and compensates for each other, quickly achieving a preliminary balance of the uneven airflow. Then the airflow enters the weak exchange area at the second plate portion 33b, and the second plate portion 33b further balances the uneven airflow. At the same time, the second plate portion 33b also plays a certain rectifying role. Finally, the airflow flows through the rectifying area at the third plate portion 33c, and after further rectification by the third plate portion 33c, it flows out of the guide tube 3 stably and with low noise.

[0077] Among them, Figure 4 As shown, in this embodiment, a plurality of circular guide holes 331 are provided on the first plate portion 33a and the second plate portion 33b, the apertures of the guide holes 331 on the first plate portion 33a are the same, the apertures of the guide holes 331 on the second plate portion 33b are the same, and the apertures of the guide holes 331 on the first plate portion 33a are The diameter of the guide hole 331 on the second plate portion 33b is 1-1.5 times of.

[0078] In addition, in this embodiment, the distribution of the guide holes 331 on the first plate portion 33 a and the second plate portion 33 b is different.

[0079] like Figure 4 As shown, in this embodiment, on the first plate portion 33a, the center distance a1 between two adjacent flow guide holes 331 along the axial direction of the first cylinder 31 is 20-35mm; at the same time, the center distance b1 between two adjacent flow guide holes 331 along the radial direction of the first cylinder 31 is 25-45mm. In addition, the flow guide holes 331 on the first plate portion 33a are arranged in at least two rows (for example, 4-6 rows) arranged along the radial direction of the first cylinder 31, and in the at least two rows of flow guide holes 331, the distance between the row of flow guide holes 331 farthest from the second cylinder 32 and the end of the first flow guide plate 33 farthest from the second cylinder 32 is 15-25mm, that is, Figure 4 In the embodiment, the distance c1 between the top row of guide holes 331 and the top of the first guide plate 33 is 15-25 mm.

[0080] On the second plate portion 33b, the center distance a2 between two adjacent flow guide holes 331 along the axial direction of the first cylinder 31 is 20-35mm; at the same time, the center distance b2 between two adjacent flow guide holes 331 along the radial direction of the first cylinder 31 is 25-45mm. In addition, the flow guide holes 331 on the second plate portion 33b are arranged in at least two rows (for example, 3-5 rows) arranged along the radial direction of the first cylinder 31, and among the at least two rows of flow guide holes 331, the distance between the row of flow guide holes 331 farthest from the second cylinder 32 and the end of the first flow guide plate 33 farthest from the second cylinder 32 is 35-55mm, that is, Figure 4 In the embodiment, the distance c2 between the top row of guide holes 331 and the top of the first guide plate 33 is 35-55 mm.

[0081] Specifically, by Figure 4 It can be seen that in this embodiment, 24 guide holes 331 are provided on the first plate portion 33a, and these 24 guide holes 331 are arranged in a matrix of 4 rows and 6 columns, while 15 guide holes 331 are provided on the second plate portion 33b, and these 15 guide holes 331 are arranged in a matrix of 3 rows and 5 columns. In addition, on the first plate portion 33a and the second plate portion 33b, the row spacing (b1 and b2) and the column spacing (a1 and a2) are 20-35mm and 25-45mm respectively. The center distance d between the guide hole 331 on the first plate portion 33a closest to the second plate portion 33b and the guide hole 331 on the second plate portion 33b closest to the first plate portion 33a is 20-35mm. Meanwhile, the distance c1 between the top row of guide holes 331 on the first plate portion 33a and the top of the first plate portion 33a is 15-25 mm, while the distance c2 between the top row of guide holes 331 on the second plate portion 33b and the top of the second plate portion 33b is 35-55 mm.

[0082] Based on the above configuration, the number of the guide holes 331 on the first plate 33a is greater than the number of the guide holes 331 on the second plate 33b, and the aperture of the guide holes 331 on the first plate 33a is greater than the aperture of the guide holes 331 on the second plate 33b. In this way, the first plate 33a can achieve a faster and more complete flow conversion process compared to the second plate 33b, and the second plate 33b can have both the flow conversion and rectification functions, so that the first guide plate 33 can better adapt to the flow characteristics of the airflow, more fully utilize the airflow energy generated by the axial flow fan, and achieve a more low-noise and stable long-distance air delivery process. In addition, the size and distribution parameters of the guide holes 331 on the first plate 33a and the second plate 33b are more in line with the distribution characteristics of the airflow pressure difference on both sides of the first guide plate 33, which is conducive to more fully increasing the speed and reducing the noise.

[0083] like Figure 2 and Figure 3 As shown, in this embodiment, the second guide plate 34 is not provided with guide holes 331, and it is arranged alternately with the first guide plate 33 in the circumferential direction, and corresponds to the position of the third plate portion 33c in the axial direction. In this way, the second guide plate 34 can play a role in strengthening the rectification, cooperate with the first guide plate 33, especially cooperate with the third plate portion 33c, to fully rectify the outlet airflow, and realize a more uniform and stable airflow discharge process.

[0084] It can be seen that the first embodiment sets guide holes 331 on the first guide plate 33 so that uneven high-speed airflows can compensate each other through the guide holes 331, forming a flow field with uniform axial flow speed at the outlet of the guide tube 3, thereby greatly improving the air delivery distance of the guide tube 3 and reducing the airflow impact noise.

[0085] exist Figure 1-4 In the illustrated embodiment, the first guide plate 33 is a flat plate, but in other embodiments, the first guide plate 33 may also be a curved plate to increase the contact area between the first guide plate 33 and the airflow, further improving the flow balancing and speed increasing effect.

[0086] Figure 5 That is, it shows an embodiment in which the first guide plate 33 is a curved plate.

[0087] like Figure 5 As shown, in this embodiment, the first guide plate 33 is no longer a flat plate, but an S-shaped plate, and the first guide plate 33 which is an S-shaped plate is symmetrically arranged about the diameter of the first cylinder 31 passing through the connection point between the first guide plate 33 and the second cylinder 32.

[0088] Specifically, Figure 5As shown, on the cross section of the guide tube 3, the intersection point of the first guide plate 33 and the first cylinder 31 is A, the intersection point with the second cylinder 32 is B, and the intersection point with the diameter of the first cylinder 31 passing through point B is C, A, B, and C are collinear, the length of the AC straight line segment is equal to the length of the BC straight line segment, and the convex direction of the AC segment curve is consistent with the rotation direction of the axial flow fan, and the convex direction of the BC segment curve is opposite to the convex direction of the AC segment curve. At the same time, the maximum distance L2 between the AC segment curve and the AC segment straight line and the maximum distance L1 between the BC segment curve and the BC segment straight line are equal, both of which are 1 / 20-1 / 10 of the diameter of the axial flow fan.

[0089] Based on the above arrangement, the first guide plate 33 is more adapted to the characteristics of the airflow provided by the axial flow fan, and can provide a larger relief space for the airflow with a higher wind speed on the outside, thereby more effectively improving the air outlet stability.

[0090] The above description is only an exemplary embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A guide tube (3), characterized in that: include: A first cylinder (31); a second cylinder (32) disposed in the first cylinder (31) and arranged coaxially with the first cylinder (31); and a plurality of first guide plates (33), the plurality of first guide plates (33) being arranged between the first cylinder (31) and the second cylinder (32), and being arranged at intervals along the circumference of the first cylinder (31), a guide channel being formed between two adjacent first guide plates (33), and a guide hole (331) being provided on the first guide plate (33), the guide hole (331) being connected to the guide channels located on both sides of the first guide plate (33); The first guide plate (33) comprises a first plate portion (33a) and a second plate portion (33b) which are connected in sequence from the inlet to the outlet direction of the first cylinder (31); the first plate portion (33a) and the second plate portion (33b) are both provided with the guide holes (331); the number of the guide holes (331) on the first plate portion (33a) is greater than the number of the guide holes (331) on the second plate portion (33b); and / or the aperture of the guide holes (331) on the first plate portion (33a) is greater than the aperture of the guide holes (331) on the second plate portion (33b).

2. The guide tube (3) according to claim 1, characterized in that: The first plate portion (33a) and / or the second plate portion (33b) are provided with at least two rows of guide holes (331) arranged radially along the first cylinder (31).

3. The guide tube (3) according to claim 2, characterized in that: The first plate portion (33a) is provided with 4 to 6 rows of flow guide holes (331) arranged radially along the first cylinder (31); and / or the second plate portion (33b) is provided with 3 to 5 rows of flow guide holes (331) arranged radially along the first cylinder (31).

4. The guide tube (3) according to claim 2, characterized in that: Among the at least two rows of guide holes (331) on the first plate portion (33a), the distance between the row of guide holes (331) farthest from the second cylinder (32) and the end of the first guide plate (33) farthest from the second cylinder (32) is 15-25 mm; and / or, among the at least two rows of guide holes (331) on the second plate portion (33b), the distance between the row of guide holes (331) farthest from the second cylinder (32) and the end of the first guide plate (33) farthest from the second cylinder (32) is 35-55 mm.

5. The guide tube (3) according to claim 1, characterized in that: On at least one of the first plate portion (33a) and the second plate portion (33b), a center distance between two adjacent flow guide holes (331) along the axial direction of the first cylinder (31) is 20-35 mm, and / or a center distance between two adjacent flow guide holes (331) along the radial direction of the first cylinder (31) is 25-45 mm.

6. The guide tube (3) according to claim 1, characterized in that: The aperture of the guide hole (331) on the first plate portion (33a) is 1-1.5 times the aperture of the guide hole (331) on the second plate portion (33b); and / or the center distance between the guide hole (331) on the first plate portion (33a) closest to the second plate portion (33b) and the guide hole (331) on the second plate portion (33b) closest to the first plate portion (33a) is 20-35 mm.

7. The guide tube (3) according to claim 1, characterized in that: The first guide plate (33) further comprises a third plate portion (33c), the third plate portion (33c) extending from the second plate portion (33b) towards the outlet of the first cylinder (31), and the guide hole (331) is not provided on the third plate portion (33c).

8. The guide tube (3) according to claim 1, characterized in that: The first guide plate (33) is a flat plate or a curved plate.

9. The guide tube (3) according to claim 8, characterized in that: The first guide plate (33) is an S-shaped plate.

10. The guide tube (3) according to claim 9, 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 between the first guide plate (33) and the second cylinder (32).

11. The guide tube (3) according to any one of claims 1 to 10, characterized in that: The guide tube (3) further comprises a second guide plate (34), the second guide plate (34) being arranged between the first tube (31) and the second tube (32) and close to the outlet of the first tube (31), and the second guide plate (34) and the first guide plate (33) being arranged alternately in sequence along the circumference of the first tube (31).

12. The guide tube (3) according to any one of claims 1 to 10, characterized in that: The first cylinder (31) and / or the second cylinder (32) are in a truncated cone shape.

13. The guide tube (3) according to any one of claims 1 to 10, characterized in that: At least one of the two axial ends of the second cylinder (32) is closed by a sealing plate (35), and the sealing plate (35) is hemispherical.

14. An engineering machine, characterized in that: It comprises a guide tube (3) as described in any one of claims 1 to 13.

15. The construction machine according to claim 14, characterized in that: The engineering machinery is a sprayer.

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