CN107761620B

CN107761620B - Air duct piece and road cleaning vehicle

Info

Publication number: CN107761620B
Application number: CN201710996393.XA
Authority: CN
Inventors: 刘汉光; 倪翔宇; 高磊磊
Original assignee: Jiangsu XCMG Guozhong Laboratory Technology Co Ltd
Current assignee: Jiangsu XCMG Guozhong Laboratory Technology Co Ltd
Priority date: 2017-10-24
Filing date: 2017-10-24
Publication date: 2023-05-30
Anticipated expiration: 2037-10-24
Also published as: CN107761620A

Abstract

The invention relates to the technical field of sanitation machinery, in particular to an air duct piece and a road cleaning vehicle. The air duct piece comprises an air duct piece body, wherein the air duct piece body comprises an air duct, an air duct inlet and an air duct outlet, the air duct is arranged in the air duct piece body, the air duct inlet and the air duct outlet are respectively communicated with the air duct, air flows into the air duct from the air duct inlet and flows out of the air duct outlet, and the air duct piece further comprises a silencing and noise-reducing structure for reducing air flow noise flowing through the air duct. According to the invention, the noise elimination and reduction structure is arranged on the air duct piece, so that the noise of the air flow flowing through the air duct can be reduced, and the noise intensity at the air duct piece can be effectively reduced. In addition, the invention can also improve the pressure distribution in the air duct piece, improve the operation efficiency, reduce the energy consumption and effectively improve the reliability and the durability of the air duct piece and accessory parts thereof.

Description

Air duct piece and road cleaning vehicle

Technical Field

The invention relates to the technical field of sanitation machinery, in particular to an air duct piece and a road cleaning vehicle.

Background

The air duct piece is an important component of a pneumatic conveying system of sanitation machines such as a road cleaning vehicle, and when the road cleaning vehicle works, air flow generated by a power source (a fan) of the pneumatic conveying system flows through the air duct piece and flows to a blowing port of the pneumatic conveying system. The air flow generates pressure loss in the process of flowing through the air duct piece, and forms larger noise.

Taking a road cleaning vehicle as an example, the air duct member is generally a square pipeline and has a larger diameter, when air passes through a curve of the air duct member, energy loss is caused by flow direction change and uneven fluid distribution, so that the flow resistance of the pipeline is increased, and fluid is easy to form turbulence, which is an important cause of vortex noise formation of the air duct member.

However, no special noise elimination and reduction structure is arranged on the air duct piece of the road cleaning vehicle at present, and noise at the air duct piece cannot be effectively controlled.

Disclosure of Invention

The invention aims to solve the technical problems that: noise at the duct member is reduced.

In order to solve the technical problems, the invention provides an air duct piece. The air duct piece comprises an air duct piece body, wherein the air duct piece body comprises an air duct, an air duct inlet and an air duct outlet, the air duct is arranged inside the air duct piece body, the air duct inlet and the air duct outlet are respectively communicated with the air duct, and air flows into the air duct from the air duct inlet and flows out from the air duct outlet.

Optionally, the noise elimination and reduction structure comprises a turbulence fin, and the turbulence fin is arranged in the air duct and used for reducing vortex generated by air flow flowing through the air duct.

Optionally, the turbulence fins are connected to the inner wall of the air duct and are provided with a first end and a second end which are sequentially arranged along the airflow flowing direction; the turbulent fin comprises at least one guide surface connected with the inner wall, the at least one guide surface comprises a first guide surface, the first guide surface is positioned at the first end of the turbulent fin, the bottom end of the first guide surface is connected with the inner wall, and the first guide surface is gradually far away from the inner wall from the bottom end of the first guide surface and obliquely extends towards the second end of the turbulent fin.

Optionally, the middle portion of the first flow guiding surface protrudes away from the inner wall with respect to both side edges in the width direction of the first flow guiding surface, and/or the width of the first flow guiding surface gradually narrows along the airflow flowing direction.

Alternatively, the widthwise middle portion of the first guide surface is projected in a direction away from the inner wall with respect to both widthwise side edges of the first guide surface.

Optionally, the profile of the bottom end of the first diversion surface is arc-shaped or arc-like.

Optionally, the at least one guiding surface further comprises two second guiding surfaces, the two second guiding surfaces are respectively connected to two sides of the first guiding surface and located between the first end of the turbulent fin and the second end of the turbulent fin, the bottom ends of the second guiding surfaces are connected with the inner wall, and the two second guiding surfaces are gradually far away from the inner wall from the respective bottom ends and gradually close to each other.

Optionally, the bottom ends of the two second diversion surfaces are gradually far away from each other along the airflow flowing direction.

Optionally, the at least one flow guiding surface further comprises a third flow guiding surface, the third flow guiding surface is arranged at the second end of the turbulent fin and connected with the first flow guiding surface, the bottom end of the third flow guiding surface is connected with the inner wall, and the third flow guiding surface is gradually far away from the inner wall from the bottom end of the third flow guiding surface and extends obliquely towards the first end of the turbulent fin.

Optionally, the third flow guiding surface is inclined from its bottom end towards the first end of the spoiler at an angle of 5-25 °.

Alternatively, the third flow guiding surface has a triangular cross-sectional shape.

Optionally, the fin further includes a bottom surface, at least one of the flow guiding surfaces is connected to the inner wall through the bottom surface, and a width of the bottom surface gradually widens along a flow direction of the air flow.

Optionally, the spoiler fin sets up in the turn of wind channel.

Optionally, the sound attenuation and noise reduction structure comprises a variable cross-section sound attenuation structure having a sound attenuation chamber in communication with the air duct, the sound attenuation chamber having a varying cross-section along a direction of airflow through the sound attenuation chamber.

Optionally, the muffling chamber comprises at least two hollow chambers in communication with each other, at least one of the at least two hollow chambers having a varying cross-section.

Optionally, the at least two hollow chambers include a first hollow chamber and a second hollow chamber which are sequentially disposed along a direction in which the airflow flows through the muffling chamber and are communicated with each other, the first hollow chamber and the second hollow chamber each have a variable cross section, and the cross section change rates of the first hollow chamber and the second hollow chamber are different.

Alternatively, one of the first hollow chamber and the second hollow chamber has a cross section that gradually becomes larger in the direction of the flow of the air through the muffling chamber and the other has a cross section that gradually becomes smaller in the direction of the flow of the air through the muffling chamber.

Alternatively, the first hollow chamber has a cross section that gradually becomes smaller in the direction of the air flow through the muffling chamber, and the second hollow chamber has a cross section that gradually becomes larger in the direction of the air flow through the muffling chamber.

Optionally, the first hollow chamber and/or the second hollow chamber is conical.

Optionally, the at least two hollow chambers further comprise a third hollow chamber, the third hollow chamber is disposed between and communicates with the first hollow chamber and the second hollow chamber, and the third hollow chamber has an equal cross section or a variable cross section.

Optionally, the third hollow chamber is cylindrical.

Optionally, the variable cross-section silencing structure further comprises a perforated plate, and the perforated plate is arranged at the outlet of the silencing chamber.

Optionally, the variable cross-section silencing structure is arranged at an air duct outlet of the air duct.

Optionally, the silencing and noise reducing structure further comprises a flow guiding part arranged in the silencing chamber, the flow guiding part comprises a flow guiding part which is rotatably arranged, the flow guiding part comprises at least two blades which are arranged at intervals around the rotation axis of the flow guiding part, and the flow guiding part can rotate under the action of air flow flowing through the silencing chamber.

Alternatively, the cross-sectional area of the flow guide portion becomes gradually larger in the direction in which the air flow flows through the muffling chamber.

Optionally, the maximum cross-sectional area of the flow guiding portion is greater than or equal to the minimum cross-sectional area of the portion of the muffling chamber located above the flow guiding portion in the direction of airflow through the muffling chamber.

Alternatively, the flow guiding portion is conical or conical-like.

Optionally, the flow guiding piece further comprises a supporting portion, the flow guiding portion is arranged on the supporting portion, and a gap is formed between the supporting portion and the perforated plate of the variable-section silencing structure.

Optionally, the flow guide is disposed in a second hollow chamber of the muffling chamber.

On the other hand, the invention also provides a road cleaning vehicle which comprises the air duct piece.

According to the invention, the noise elimination and reduction structure is arranged on the air duct piece, so that the noise of the air flow flowing through the air duct can be reduced, and the noise intensity at the air duct piece can be effectively reduced. And the noise elimination and reduction structure is arranged, sound energy attenuation can be accelerated by reflecting, interfering and the like sound waves in the air duct piece transmitted from the outside, noise in the air duct piece transmitted from the outside is reduced, and the noise intensity at the air duct piece is reduced.

In addition, the noise elimination and reduction structure can comprise at least one of a turbulence fin variable-section noise elimination and reduction structure and a flow guide piece, so that the noise level at the air duct piece can be improved more effectively, the pressure loss caused by disordered air flow can be reduced, the energy consumption is reduced, and the purposes of energy conservation and noise reduction are achieved. In addition, the silencing and noise reducing structure can enable the air flow in the air duct of the air duct piece to be more stable, is beneficial to reducing the stress variation of the air duct piece and the auxiliary structural components thereof, and improves the reliability and durability of products.

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

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

Fig. 1 is a schematic view showing the overall structure of an air duct member according to an embodiment of the present invention.

Fig. 2 shows a schematic perspective view of the spoiler of fig. 1.

Fig. 3 shows a partial cross-sectional view of the air duct member of fig. 1 at a variable cross-section sound attenuating structure.

Fig. 4 shows a schematic perspective view of the variable cross-section sound damping structure of fig. 3.

Fig. 5 shows a perspective view from another perspective (top view) of fig. 4.

Fig. 6 shows a cross-sectional view of fig. 4.

Fig. 7 shows a schematic perspective view of the deflector in fig. 6.

In the figure:

1. an air duct member body; 10. an air duct;

3. turbulence fins; 31. a bottom surface; 32. a first guide surface; 33. a second guide surface; 34. a third guide surface;

5. a variable cross-section sound attenuation structure; 51. a first lumen structure; 52. a second lumen structure; 53. a perforated plate; 510. a first hollow chamber; 521. a second hollow chamber; 511. a third hollow chamber;

6. a flow guide; 61. a flow guiding part; 611. a blade; 62. a support plate; 63. and (3) rotating the shaft.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on embodiments of the present invention, are within the scope of the present invention.

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

In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for defining the components, and are merely for convenience in distinguishing the corresponding components, and the terms are not meant to have any special meaning unless otherwise indicated, so that the scope of the present invention is not to be construed as being limited.

Figures 1-7 illustrate one embodiment of a tunnel member of the present invention. Referring to fig. 1 to 7, the air duct member provided by the present invention includes an air duct member body 1, the air duct member body 1 includes an air duct 10, an air duct inlet and an air duct outlet, the air duct 10 is disposed inside the air duct member body 1, the air duct inlet and the air duct outlet are respectively communicated with the air duct 10, and air flows into the air duct 10 from the air duct inlet and flows out from the air duct outlet, and the air duct member further includes a noise-damping and noise-reducing structure for reducing noise of air flowing through the air duct 10.

Because the noise elimination and reduction structure is arranged, the noise elimination and reduction structure can be used for reducing the noise of the air flow flowing through the air duct 10, effectively controlling the noise generated by the air flow at the air duct, weakening the outward transmission of the noise and reducing the noise pollution.

The sound damping and noise reducing structure of the present invention may comprise the spoiler 3 and/or the variable cross-section sound damping structure 5.

The fin 3 is disposed in the air duct 10, and is used for reducing vortex generated by air flowing through the air duct 10. The turbulence fin 3 can reduce the vortex in the air duct 10 and change the flow state of the air flow with disorder, so the turbulence fin 3 can effectively reduce the vortex noise in the air duct 10, reduce the noise intensity, and avoid the pressure loss caused by the disorder of the air flow. Wherein preferably the spoiler 3 is arranged at the turn of the air duct 10. Since the air flow is more likely to generate vortex when passing through the turning point, the vortex fin 3 is arranged at the turning point of the air duct 10, so that the vortex can be more fully reduced, and the vortex noise can be more effectively reduced.

As an embodiment of the fin 3 of the present invention, the fin 3 may be attached to the inner wall of the duct 10 and have a first end and a second end disposed along the flow direction of the air flow; the turbulent fin 3 comprises at least one guide surface connected with the inner wall, and the air flow is guided by the at least one guide surface, so that the disordered flow state of the air flow when the air flow passes through a curve or the like is changed, and the vortex is reduced.

The variable cross-section sound damping structure 5 has a sound damping chamber in communication with the air duct 10, and the sound damping chamber has a varying cross-section in the direction of the airflow through the sound damping chamber. By providing a variable cross-section sound attenuating structure 5, the refraction and reflection of the airflow back and forth in the sound attenuating chamber due to sudden contraction and/or expansion of the cross-section can be caused, so that sound energy can be consumed and noise can be reduced. The variable cross-section sound attenuating structure 5 of the present invention is preferably disposed at the outlet of the duct 10 so as to further reduce the noise before the airflow exits the duct member, and to more effectively reduce the outward propagation of the noise.

Furthermore, the noise elimination and reduction structure of the present invention further includes a guide member 6 disposed in the noise elimination chamber, the guide member 6 includes a guide portion 61 rotatably disposed, the guide portion 61 includes at least two blades 611 spaced apart from each other around a rotation center of the guide portion 523, and the guide portion 61 can rotate under the action of the air flow flowing through the noise elimination chamber. Since the flow guiding element 6 can refract and reflect the sound wave in the process that the air flow flows through the silencing chamber, the air flow noise can be further reduced by arranging the flow guiding element 6. Moreover, when the air flow flows through the muffling chamber, the flow guiding part 61 can rotate under the action of the air flow, and in the rotating process of the flow guiding part 61, the space formed by the interval between the adjacent blades 611 can generate suction force along with the rotation, so that the air flow in the air duct 10 is more smoothly discharged to the outside of the air duct piece under the suction effect, thereby not only improving the discharge efficiency of the air flow, but also being beneficial to reducing the pressure loss in the air duct 10.

The invention will be further described with reference to the embodiments shown in fig. 1-7. This embodiment takes the air duct member of the road cleaning vehicle as an example.

As shown in fig. 1 to 7, in this embodiment, the air duct member includes an air duct member body 1, a spoiler 3, a variable cross-section noise reducing structure 5, and a deflector 6, wherein the spoiler 3, the variable cross-section noise reducing structure 5, and the deflector 6 serve as noise reducing structures for reducing noise generated by an air flow flowing through the air duct member.

The direction of the arrows in fig. 1 represent the direction of airflow in the tunnel member. As can be seen in fig. 1, in this embodiment, the air duct member body 1 includes an

air duct

10, 1 air duct inlet and four air duct outlets, wherein both the air duct inlet and the air duct outlet are in fluid communication with the air duct 10. The air flow generated by the power sources such as a fan flows into the air duct 10 from the air duct inlet and flows to each air duct outlet through the air duct 10, and each air duct outlet is communicated with the external environment or the corresponding back blowing air inlet of the dust suction device of the road cleaning vehicle, so that the pneumatic conveying system of the road cleaning vehicle can carry out garbage cleaning operation in an air circulation mode.

The spoiler 3 of this embodiment will be first described with reference to fig. 1 and 2.

As can be seen from fig. 1, in this embodiment, the spoiler 3 is disposed in the duct 10 for reducing noise generated in the duct 10 by low air flow.

As shown in fig. 1, the turbulence fins 3 are disposed at the corners of the air duct 10, so that the turbulence generated by the air flow in the air duct 10 can be reduced more effectively, noise is reduced, and pressure loss is reduced. The spoiler fins 3 may be arranged singly or in rows. As can be seen from fig. 1, in this embodiment, the plurality of turbulence fins 3 are disposed at intervals along the height direction of the duct 10 at the turning point of the duct 10, and break up the airflow vortex over the entire longitudinal section of the turning point of the duct 10. Also, as shown in fig. 1, in this embodiment, each of the spoiler fins 3 is provided at a side having a smaller radius of curvature (i.e., left side in fig. 1) at the turn of the air duct 10, so that the vortex can be reduced more effectively.

Specifically, as shown in fig. 2, the spoiler 3 of this embodiment includes a bottom surface 31 and a first guide surface 32, a second guide surface 33 and a third guide surface 34 serving as guide surfaces, wherein the bottom surface 31 is connected to an inner wall of the air duct 10, and bottom ends of the first guide surface 32, the second guide surface 33 and the third guide surface 34 are all connected to the bottom surface 31, that is, the first guide surface 32, the second guide surface 33 and the third guide surface 34 are all connected to the inner wall of the air duct 10 through the bottom surface 31, so as to realize the installation of the spoiler 3 in the air duct 10.

For convenience of description, an upstream end of the both ends of the bottom surface 31 in the airflow direction is hereinafter referred to as a "first end of the bottom surface 31", and a downstream end of the both ends of the bottom surface 31 in the airflow direction is hereinafter referred to as a "second end of the bottom surface 31", that is, the first end of the bottom surface 31 and the second end of the bottom surface 31 refer to both ends of the bottom surface 31 sequentially arranged in the airflow direction, respectively, while it is to be understood that the first end of the bottom surface 31 is the first end of the aforementioned spoiler 3, and the second end of the bottom surface 31 is the second end of the aforementioned spoiler 3.

The first guiding surface 32 is disposed at a first end of the bottom surface 31, and is used for guiding the air flow to smoothly flow into the spoiler 3. As shown in fig. 2, in this embodiment, the bottom end of the first flow guiding surface 32 is connected to the inner wall of the air duct 10 by being connected to the first end of the bottom surface 31, and the first flow guiding surface 32 extends from the bottom end thereof gradually away from the bottom surface 31 (i.e., gradually away from the inner wall) and obliquely toward the second end of the bottom surface 31 (i.e., downstream in the air flow direction). Based on the arrangement, the top end of the first guiding surface 32 is inclined upwards and backwards relative to the bottom end of the first guiding surface 32, so that part of air flow can be guided to flow upwards and backwards smoothly and orderly, the risk of rapid change of wind speed or wind pressure caused by abrupt change of a flow path of the air flow is reduced, the air flow can flow through places where turbulence is easy to occur, such as a turning place of the air duct 10, more smoothly and orderly, the flow speed of the air flow when the air flow flows through the turning place is slowed down, vortex flow can be effectively reduced, and noise level in the air duct 10 is reduced.

In the present invention, the upstream in the air flow direction is the front, the downstream in the air flow direction is the rear, the position of the inner wall is the bottom, the direction of the inner wall is the upward direction of the inner wall.

Further, as can be seen from fig. 2, in this embodiment, the width of the first flow guiding surface 32 gradually narrows along the flow direction of the air flow. Therefore, the front of the first guide surface 32 is wide and the rear of the first guide surface is narrow, so that the airflow can be guided to flow backwards more stably and orderly, the generation of vortex is reduced, and the noise intensity is effectively reduced.

In addition, as shown in fig. 2, in this embodiment, the widthwise middle portion of the first flow guiding surface 32 is projected in a direction away from the inner wall with respect to both widthwise side edges of the first flow guiding surface 32. The first diversion surface 32 is wide in the lower part and narrow in the upper part, can guide the airflow to flow upwards and to the middle, has a certain diversion effect on the airflow, and is more beneficial to guiding the airflow to flow stably. Moreover, this arrangement also helps to increase the velocity of the airflow exiting the first guide surface 32, facilitating continued rearward flow of the airflow along the second guide surface 33.

Specifically, in fig. 2, the middle part of the first flow guiding surface 32 opposite in width protrudes in a direction away from the inner wall to form a high-rise part with a middle ridge line, and the high-rise part divides the first flow guiding surface 32 into two inwardly inclined sub-surfaces located at both sides of the middle ridge line, which makes the air flow in the process of flowing upward and backward along the first flow guiding surface 32, and makes the air flow flowing along the two sub-surfaces flow toward the middle, so that the air flow distribution is more uniform, thereby further enhancing the flow guiding effect of the first flow guiding surface 32 and more sufficiently reducing the vortex.

As can be seen from fig. 2, the contour of the bottom end of the first guide surface 32 in this embodiment is circular. The first guide surface 32 having the shape profile can smoothly guide the airflow, so that the airflow is diffused from the bottom end of the first guide surface 32 to the periphery of the top end, the two sides and the like in a conical shape, the airflow velocity is reduced, and the disordered flow state of the airflow is changed more effectively. Of course, the bottom end profile of the first flow guiding surface 32 may be shaped like an arc, in which case the first flow guiding surface 32 may guide the airflow to spread from its bottom end to the top end, both sides, and the like. Accordingly, the contour of the first end of the bottom surface 31 connected to the bottom end of the first flow guiding surface 32 is also preferably set to be arc-shaped or arc-like.

The second diversion surface 33 is disposed at a side of the first diversion surface 32 and located between the first end of the bottom surface 31 and the second end of the bottom surface 31, and is used for diversion of the air flow at the side of the first diversion surface 32. As shown in fig. 3, in this embodiment, two second guide surfaces 33 are respectively connected to two sides of the first guide surface 32, and a bottom end of each second guide surface 31 is connected between a first end of the bottom surface 31 and a second end of the bottom surface 31, and the two second guide surfaces 33 gradually move away from the inner wall from the respective bottom ends and gradually approach each other, that is, top ends of the two second guide surfaces 33 are inclined upward and inward relative to the bottom ends of the second guide surfaces 33. The second guiding surface 33 thus arranged can guide the airflow which is not guided by the first guiding surface 32 to flow, and can continuously guide the airflow to flow to the third guiding surface 34, so that the second guiding surface 33 is matched with the first guiding surface 32, and more airflows are guided to smoothly and orderly flow from the first end of the bottom surface 31 to the second end of the bottom surface 31, thereby being capable of reducing vortex more sufficiently, and further being capable of reducing noise more effectively.

In addition, as can be seen from fig. 2, in this embodiment, the width of the bottom surface 31 gradually widens along the flow direction of the air flow. This arrangement makes the bottom ends of the two second guide surfaces 33 connected to both sides of the bottom surface 31 gradually separate from each other along the airflow flowing direction, and can guide the airflow to flow through the shape mutation more smoothly, so that the airflow can flow more orderly, and the noise can be reduced more effectively.

The third guiding surface 34 is disposed at the second end of the bottom surface 31, and forms a leeward surface for guiding the air flow smoothly out of the spoiler 3. In this embodiment, as shown in fig. 2, the third guide surface 34 is connected to the first guide surface 34, and the bottom end of the third guide surface 34 is connected to the inner wall of the air duct 10 by being connected to the second end of the bottom surface 31, and the third guide surface 34 gradually extends away from the inner wall from the bottom end thereof and is inclined toward the first end of the bottom surface 31. In this way, the top end of the third guiding surface 34 is inclined upwards and forwards relative to the bottom end of the third guiding surface 34, so that the third guiding surface 34 can guide the air flow to smoothly and orderly flow out of the turbulence fins 3, and the backflow of the air flow at the second end of the turbulence fins 3 can be effectively reduced, and the wind resistance is reduced. Specifically, the third flow guiding surface 34 of this embodiment is inclined from the bottom end toward the first end of the bottom surface 31 (i.e., the first end of the spoiler 3) by an angle of 5-25 °, that is, the top end of the third flow guiding surface 34 is inclined upward and forward relative to the bottom end of the third flow guiding surface 34 by an angle of 5-25 °, and the third flow guiding surface 34 having this inclined angle can more effectively improve the air flow smoothness and reduce the backflow, and has smaller wind resistance.

As can be seen from fig. 2, the third flow guiding surface 34 of this embodiment has a triangular cross-sectional shape. The triangular section can guide the air flow to diffuse from the middle part to the two sides when the air flow flows out of the turbulent fin 3, so that the stable order of the air flow in the subsequent flowing process is enhanced, and the third flow guiding surface 34 with the sectional shape can better play a role in guiding and reducing noise.

As is clear from the above analysis, in the fin 3 of this embodiment, by providing the bottom surface 31, the first guide surface 32, the second guide surface 33, and the third guide surface 34, and reasonably designing the shapes and positions of the bottom surface 31, the first guide surface 32, the second guide surface 33, and the third guide surface 34, the flow velocity and the pressure distribution when the high-speed air flows through the positions such as the turning positions in the air duct 10 can be improved, so that the air flow is distributed more uniformly at the positions, thereby more effectively reducing turbulence formation, more fully reducing noise intensity, and reducing pressure loss.

Of course, in other embodiments of the present invention, the bottom surface 31 may be omitted, and the bottom ends of the first guide surface 32, the second guide surface 33 and the third guide surface 34 may be directly connected to the inner wall of the air duct 10 or connected to the bottom surface by other structures, and the advantage of providing the bottom surface 31 in this embodiment is that the installation of the spoiler 3 in the air duct 10 is facilitated.

The variable cross-section sound damping structure 5 and the flow guide 6 of this embodiment will be described below mainly with reference to fig. 1 and fig. 3 to 7.

In this embodiment, a variable cross-section sound attenuating structure 5 is provided at the duct outlet for further reducing the noise of the airflow before it exits the duct member, as shown in fig. 1. Wherein the variable cross-section sound damping structure 5 may be provided at one or several of the four air duct outlets of the air duct member. Further, as can be seen in connection with fig. 3 to 6, the variable cross-section sound damping structure 5 of this embodiment includes a perforated plate 53 and a first lumen structure 51 and a second lumen structure 52 that are disposed in order along the direction of the airflow through the variable cross-section sound damping structure 5 and communicate with each other. The second lumen structure 52 is connected to the air channel member body 1 through the first lumen structure 51.

Wherein the first lumen structure 51 has a first hollow chamber 510 having a conical shape and a third hollow chamber 511 having a cylindrical shape; the second lumen structure 52 has a second hollow chamber 521 having a conical shape. The third hollow chamber 511 is provided between the first hollow chamber 510 and the second hollow chamber 521 and communicates the first hollow chamber 510 and the second hollow chamber 521. And, the cross section of the first hollow chamber 510 becomes gradually smaller along the direction in which the air flow passes through the variable cross section sound deadening structure 5; the cross-section of the second hollow chamber 521 becomes gradually larger; the third hollow chamber 511 has an equal cross section.

Based on the above arrangement, the sound damping chamber of the variable cross-section sound damping structure 5 includes three hollow chambers, and two variable cross-section hollow chambers (i.e., the first hollow chamber 510 and the second hollow chamber 521) and one constant cross-section hollow chamber (i.e., the third hollow chamber 511) located in the middle of the two variable cross-section sound damping chambers are included in the three hollow chambers. Since each of the first hollow chamber 510 and the second hollow chamber 521 has a variable cross section, reflection and refraction can repeatedly occur in the corresponding hollow chamber when an air flow passes through either of the two hollow chambers, and noise can be reduced since a part of acoustic energy can be dissipated during reflection and refraction. Moreover, since there is a sudden change in the cross-section of the sound-damping chamber at the junction of the first hollow chamber 510 with the outlet of the air duct 10, the junction of the first hollow chamber 510 with the third hollow chamber 511, and the junction of the third hollow chamber 511 with the second hollow chamber 521, for example, there is a sudden expansion in the cross-section at the junction of the third hollow chamber 511 with the second hollow chamber 521, this allows the sound waves to also be refracted and reflected back and forth at each respective junction region, thereby dissipating sound energy and reducing noise. In addition, in this embodiment, along the direction of the airflow flowing through the muffling chamber, the first hollow chamber 510 gradually contracts, and the second hollow chamber 521 gradually expands, so that noise can be effectively reduced, and the airflow can be more effectively guided to flow, so that the airflow flows out of the air duct member more smoothly and orderly, and wind resistance is reduced.

The perforated plate 53 is arranged at the outlet of the second hollow chamber 521, i.e. at the outlet of the sound-damping chamber. The perforated plate 53 may have a plurality of through holes uniformly or non-uniformly formed therein, and the through holes communicate the muffling chamber with the external environment. Based on this, when the sound wave passes through the perforated plate 53, part of the sound energy is converted into heat energy to be dissipated due to the friction resistance and viscous resistance, so that the noise can be further reduced, and the outward propagation of the noise can be reduced.

In addition, as can be seen from fig. 3 to 7, in this embodiment, the silencing chamber of the variable cross-section silencing structure 5 is also provided inside with a flow guide 6. As can be seen from fig. 6 and 7, the flow guide member 6 of this embodiment is disposed in the second hollow chamber 521, and includes a rotatably disposed flow guide portion 61, where the flow guide portion 61 includes a plurality of blades 611 spaced apart from each other about the rotation axis of the flow guide portion 523, and the flow guide portion 61 can rotate under the action of the air flow flowing through the muffling chamber. By providing the flow guiding member 6, when the air flow passes through the muffling chamber, the flow guiding portion 61 can rotate under the action of the air flow, so that the interval between the adjacent blades 611 generates a suction force along with the rotation, and the air flow in the air duct 10 is sucked out of the air duct member, thereby improving the air flow discharging efficiency and effectively reducing the pressure loss. In addition, the rotating guide part 61 can reflect and refract sound waves more effectively, and plays a role in silencing and reducing noise. Of course, the number of blades 611 may be two; and the flow guide 6 may be provided in the first hollow chamber 510 or the third hollow chamber 511.

Specifically, as shown in fig. 6, the flow guide 6 of this embodiment further includes a support portion, specifically a support plate 62, disposed concentrically with the perforated plate 53 upstream of the perforated plate 53 in the direction in which the airflow flows through the muffling chamber, and a flow guide 61 disposed on the support portion. The support part can more conveniently realize the rotatable arrangement of the flow guiding part 61 in the silencing cavity, and the support part can seal the bottom ends of the intervals between the adjacent blades 611 to form a flow guiding cavity with an open top, which is more beneficial to sucking air flow and rebounding noise. More specifically, as can be seen from fig. 6, in this embodiment, the support plate 62 and the perforated plate 53 are disposed upstream of the perforated plate 53 with a gap therebetween, so that a space is left between the flow guide 6 and the perforated plate 53, facilitating the flow of the air stream, and facilitating the perforated plate 53 to function to reduce the noise of the air stream. And, the rotation shaft 63 passes through the support plate 62 and is connected to the perforated plate 53, and each blade 611 is disposed at intervals around the rotation shaft 63. On the one hand, the rotating shaft 63 forms a rotating axis of the flow guiding part 62, so that the flow guiding part 62 can rotate conveniently; on the other hand, the rotation shaft 63 also plays a certain supporting role, which facilitates the reliable installation of the flow guide 6 in the muffling chamber.

In addition, as shown in fig. 7, in this embodiment, the cross section of the blade 611 gradually increases along the direction of the airflow flowing through the muffling chamber, so that the cross sectional area of the flow guiding portion 61 gradually increases along the direction of the airflow flowing through the muffling chamber, which is convenient for guiding the airflow out of the muffling chamber, has smaller resistance, and is more beneficial for rebounding sound waves and reducing noise. Moreover, as can be seen from fig. 6, the maximum cross-sectional area of the flow guiding portion 61 of this embodiment is larger than the cross-sectional area of the outlet end of the third hollow chamber 511 (i.e. the minimum cross-sectional area of the portion of the muffling chamber located above the flow guiding portion 61 along the direction of the airflow flowing through the muffling chamber), so that the flow guiding member 6 can better play a role of bouncing sound waves and reducing noise. Wherein, alternatively, the maximum cross-sectional area of the flow guiding portion 61 may also be equal to the minimum cross-sectional area of the portion of the muffling chamber located above the flow guiding portion 61 in the direction of the air flow through the muffling chamber. And, the end of blade 611 far away from the axis of rotation is curved, is specific to arc in fig. 6, and windage is less, and the suction effect is better in the rotation process, is more favorable to ventilation and noise reduction.

As can be seen from fig. 6 and 7, the flow guiding portion 61 of this embodiment has a conical shape, specifically, a conical shape with a smaller upper part and a larger lower part. Based on this, the flow guiding part 61 can more effectively suck and guide the airflow to flow out of the silencing chamber, can also more effectively rebound noise, and has a simpler and more attractive structure, thereby being convenient for processing. Of course, the flow guiding portion 61 may have other shapes such as a conical shape.

It can be seen that, in this embodiment, by arranging the turbulence fins 3 located inside the air duct 10, the variable cross-section silencing structure 5 located at the outlet of the air duct, the flow guiding member 6, and the like, noise generated by the air flow can be effectively inhibited in the whole process from entering the air duct 10 to flowing out of the air duct 10, and the noise can be effectively reduced on the flow path of the whole air duct member, so that the silencing and noise reducing effects are obvious; in addition, the embodiment can effectively improve the pressure distribution in the air duct piece, is beneficial to improving the operation efficiency of the road cleaning vehicle applying the air duct piece and reducing the operation oil consumption while reducing the noise intensity.

In addition, noise at the duct member may originate from noise generated by the air flow through the duct 10 under the influence of the fan on the one hand, and may also originate from noise from the outside into the duct member on the other hand. The noise elimination and reduction structure provided in this embodiment can reduce noise of air flowing through the air duct 10, and simultaneously, can accelerate attenuation of acoustic energy by reflecting and interfering acoustic waves and the like in the air duct member externally introduced, and reduce noise in the air duct member externally introduced, which also helps to reduce noise intensity at the air duct member.

In addition, due to the arrangement of the turbulence fins 3, the flow guiding members 6 and the like, the air flow in the air duct 10 of the air duct member can be more stable, and the stress variation of the air duct member and the auxiliary structural components thereof is reduced, so that the embodiment is also beneficial to improving the reliability and the durability of the air duct member and the auxiliary structural components thereof.

It should be noted that, in other embodiments of the present invention, the sound-deadening chamber is not limited to include the first hollow chamber 510, the second hollow chamber 521, and the third hollow chamber 511 at the same time, but may include only one or two of the three. In practice, the variable-section sound-deadening structure 5 can be made to perform a certain sound-deadening and noise-reducing function as long as the sound-deadening chamber includes at least two hollow chambers communicating with each other, and at least one of the at least two hollow chambers has a varying cross section.

Moreover, the shape of the first hollow chamber 510 and the second hollow chamber 521 is not limited to conical, and other shapes having a variable cross-section may be adopted for both. Also, while the illustrated embodiment provides for the first hollow chamber 510 to be tapered and the second hollow chamber 521 to be tapered, it should be appreciated that the variation in cross-section of the first hollow chamber 510 and the second hollow chamber 521 is not limited in this manner as well, along the direction of airflow through the muffling chamber. For example, the cross-section of the first hollow chamber 510 may be gradually increased while the cross-section of the second hollow chamber 521 is gradually decreased along the direction of the airflow flowing through the muffling chamber. That is, in the present invention, one of the first hollow chamber 511 and the second hollow chamber 521 may have a cross section that gradually increases in the direction of the air flow through the muffling chamber and the other one has a cross section that gradually decreases in the direction of the air flow through the muffling chamber, so that the structure is simpler, the appearance is more attractive, the strength is higher, and it is advantageous to make the air flow more effectively due to the abrupt change of the cross section in the process of flowing from the first hollow chamber 510 to the second hollow chamber 521, thereby more effectively reducing noise. Alternatively, for another example, the cross section of the first hollow chamber 521 and the cross section of the second hollow chamber 521 may be gradually increased or gradually decreased along the direction of the airflow flowing through the silencing chamber, so long as the change rates of the cross sections of the first hollow chamber 521 and the second hollow chamber are different, the cross section abrupt change may be formed, and the effect of reducing noise is better.

The shape of the third hollow chamber 510 is not limited to a cylindrical shape, and it may also take other uniform cross-sectional shapes, and even it may take a variable cross-sectional shape. The cylindrical shape has the advantages of simple structure, convenient processing, and convenient cooperation with the first hollow chamber 510 or the second hollow chamber 521 to form abrupt cross section changes, thereby reducing noise.

The air duct piece is applied to the road cleaning vehicle, so that the problems of large noise and large operation oil consumption of a pneumatic conveying system of the diversion cleaning vehicle can be effectively solved. The invention also provides a road cleaning vehicle comprising the air duct member of the invention.

The foregoing description of the exemplary embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims

1. The air duct piece comprises an air duct piece body (1), wherein the air duct piece body (1) comprises an air duct (10), an air duct inlet and an air duct outlet, the air duct (10) is arranged in the air duct piece body (1), the air duct inlet and the air duct outlet are respectively communicated with the air duct (10), air flows into the air duct (10) from the air duct inlet and flows out from the air duct outlet, the air duct piece is characterized by further comprising a silencing and noise-reducing structure, the silencing and noise-reducing structure is used for reducing noise of air flow flowing through the air duct (10), the silencing and noise-reducing structure comprises a turbulence fin (3), the turbulence fin (3) is arranged in the air duct (10) and is used for reducing vortex generated by the air flow flowing through the air duct (10), the turbulence fin (3) is connected to the inner wall of the air duct (10) and is provided with a first end and a second end which are sequentially arranged along the air flow direction, the turbulence fin (3) comprises at least one flow guide surface connected with the inner wall, the at least one flow guide surface comprises a first flow guide surface and a second flow guide surface (32) which is connected with the first flow guide surface and the second flow guide surface (32) and the first flow guide surface (32) is located at the end (32) of the first flow guide surface and the second flow guide surface (32) is gradually away from the first flow guide surface (32), the middle part of first guide surface (32) is relative first guide surface (32) width direction both sides edge is towards keeping away from the direction of inner wall protrusion, along air current flow direction, the width of first guide surface (32) narrows gradually, and two second guide surface (33) are connected respectively first guide surface (32) both sides and are located between the first end of vortex fin (3) and the second end of vortex fin (3), the bottom of second guide surface (33) with the inner wall connection, two second guide surface (33) are kept away from each bottom gradually the inner wall and draw close each other gradually.

2. The air duct member of claim 1, wherein,

the middle part of the first diversion surface (32) in the width direction is protruded towards the direction away from the inner wall relative to the two side edges of the first diversion surface (32) in the width direction.

3. The air duct member according to claim 1, wherein the profile of the bottom end of the first flow guiding surface (32) is circular or arc-like.

4. A tunnel element according to claim 1, characterized in that the bottom ends of the two second guide surfaces (33) are gradually distanced from each other in the direction of the airflow.

5. The air duct piece according to claim 1, characterized in that the at least one flow guiding surface further comprises a third flow guiding surface (34), the third flow guiding surface (34) is arranged at the second end of the turbulence fin (3) and is connected with the first flow guiding surface (32), and the bottom end of the third flow guiding surface (34) is connected with the inner wall, and the third flow guiding surface (34) gradually extends away from the inner wall from the bottom end thereof and is inclined towards the first end of the turbulence fin (3).

6. A tunnel element according to claim 5, characterized in that the third flow guiding surface (34) is inclined from its bottom end towards the first end of the fin (3) at an angle of 5-25 °.

7. The air duct member according to claim 5, wherein the third flow guiding surface (34) has a triangular cross-sectional shape.

8. The tunnel element according to claim 1, characterized in that the spoiler fins (3) further comprise a bottom surface (31), the at least one flow guiding surface being connected to the inner wall by means of the bottom surface (31), the width of the bottom surface (31) widening gradually in the direction of the airflow.

9. The air duct piece according to claim 1, characterized in that the spoiler fins (3) are arranged at turns of the air duct (10).

10. A duct piece according to any one of claims 1-9, characterized in that the sound-damping and noise-reducing structure comprises a variable cross-section sound-damping structure (5), the variable cross-section sound-damping structure (5) having a sound-damping chamber in communication with the duct (10), the sound-damping chamber having a varying cross-section in the direction of the air flow through the sound-damping chamber.

11. The air duct member of claim 10, wherein the muffling chamber includes at least two hollow chambers in communication with each other, at least one of the at least two hollow chambers having a varying cross-section.

12. The air duct member according to claim 11, wherein the at least two hollow chambers include a first hollow chamber (510) and a second hollow chamber (521) which are disposed in order along a direction in which the air flow passes through the muffling chamber and are communicated with each other, the first hollow chamber (510) and the second hollow chamber (521) each have a variable cross section, and the rates of change of the cross sections of the first hollow chamber (510) and the second hollow chamber (521) are different.

13. The air duct member of claim 12, wherein one of the first hollow chamber (510) and the second hollow chamber (521) has a cross section that gradually increases in the direction of airflow through the sound-deadening chamber and the other has a cross section that gradually decreases in the direction of airflow through the sound-deadening chamber.

14. The air duct member according to claim 13, wherein the first hollow chamber (510) has a cross section that gradually becomes smaller in a direction in which the air flow passes through the sound-deadening chamber, and the second hollow chamber (521) has a cross section that gradually becomes larger in a direction in which the air flow passes through the sound-deadening chamber.

15. The air duct piece according to claim 12, characterized in that the first hollow chamber (510) and/or the second hollow chamber (521) are conical.

16. The air duct piece according to claim 12, wherein the at least two hollow chambers further comprise a third hollow chamber (511), the third hollow chamber (511) being arranged between the first hollow chamber (510) and the second hollow chamber (521) and communicating the first hollow chamber (510) and the second hollow chamber (521), the third hollow chamber (511) having an equal or varying cross section.

17. A tunnel according to claim 16, wherein the third hollow chamber (511) is cylindrical.

18. The air duct piece according to claim 10, characterized in that the variable cross-section sound damping structure (5) further comprises a perforated plate (53), which perforated plate (53) is arranged at the outlet of the sound damping chamber.

19. A duct piece according to claim 10, characterized in that the variable cross-section sound damping structure (5) is arranged at the duct outlet of the duct (10).

20. The air duct member according to claim 10, wherein the sound-damping and noise-reducing structure further comprises a flow guiding member (6) provided in the sound-damping chamber, the flow guiding member (6) comprising a rotatably provided flow guiding portion (61), the flow guiding portion (61) comprising at least two blades (611) provided at a distance from each other around a rotational axis of the flow guiding portion (61), the flow guiding portion (61) being rotatable under the influence of an air flow flowing through the sound-damping chamber.

21. A duct member according to claim 20, wherein the cross-sectional area of the flow guiding portion (61) becomes gradually larger in the direction of the air flow through the muffling chamber.

22. A duct piece according to claim 21, characterized in that the largest cross-sectional area of the flow guiding portion (61) is larger than or equal to the smallest cross-sectional area of the part of the muffling chamber located above the flow guiding portion (61) in the direction of the air flow through the muffling chamber.

23. A duct member according to claim 20, characterized in that the flow guiding portion (61) is conical or conical-like.

24. The air duct piece according to claim 20, characterized in that the flow guiding piece (6) further comprises a supporting part, the flow guiding part (61) is arranged on the supporting part, and a gap is arranged between the supporting part and the perforated plate (53) of the variable cross-section silencing structure (5).

25. A duct element according to claim 20, characterized in that the flow guide element (6) is arranged in the second hollow chamber (521) of the sound-damping chamber.

26. A road cleaning vehicle comprising a tunnel member as claimed in any one of claims 1 to 25.