Sound attenuation, noise reduction and air volume regulation and control device of axial flow fan

Abstract

The utility model discloses a noise reduction and air volume regulation and control device for an axial flow fan, and relates to the technical field of urban area ventilation tests. The noise reduction and air volume regulation and control device for the axial flow fan comprises a noise reduction cylinder and an air volume regulation and control assembly, and one end of the noise reduction cylinder is used for being communicated with an air outlet of the axial flow fan; the air volume regulation and control assembly comprises a fixed petal body, a movable petal body and a driving mechanism which are arranged in the noise reduction cylinder, an air volume regulation and control opening is formed in the fixed petal body, and the driving mechanism is used for driving the movable petal body to rotate around the center line of the noise reduction cylinder so as to open or close the air volume regulation and control opening. According to the application, the air volume regulation and control assembly is arranged in the sound attenuation and noise reduction cylinder, so that the linear regulation of the size of the air volume regulation and control port and the ventilation quantity can be realized, and the ventilation requirements in different test scenes are met. And by arranging the silencing and noise reduction cylinder, noise generated during operation of the axial flow fan can be effectively reduced, and the device can better meet the strict requirements of urban areas for noise control.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of urban area ventilation test, in particular to an axial flow fan noise reduction and air volume regulation device. BACKGROUND

[0002] An axial flow fan is a common ventilation equipment, and its working principle is to make gas flow along the axial direction through the rotation of the impeller, so as to realize the air delivery. The axial flow fan has the advantages of simple structure, convenient installation, obvious ventilation and air exchange effect, and is widely used in the fields of industry, building, transportation and energy.

[0003] In recent years, with the acceleration of urbanization, the ventilation demand of urban areas is increasing. The axial flow fan is widely used in the ventilation test research of urban areas due to its high-efficiency ventilation capacity. These test researches mainly focus on improving the air quality inside urban buildings, reducing indoor temperature and optimizing the design of ventilation systems.

[0004] However, in the process of carrying out the urban area ventilation test research, the axial flow fan also exposes some obvious shortcomings. First, the general axial flow fan adopts a multi-grade regulation mode, which cannot realize linear air volume control. This means that in actual application, it is difficult to accurately adjust the air volume according to the slight changes of the ventilation demand, resulting in unsatisfactory ventilation effect. Secondly, the axial flow fan produces relatively large noise during operation, and the urban area has strict requirements on noise control. Excessive noise not only interferes with the normal life of residents, but also may cause noise pollution to the surrounding environment. CONTENT OF THE INVENTION

[0005] The purpose of the application is to provide an axial flow fan noise reduction and air volume regulation device, which solves the problems of unable to realize linear air volume regulation and easy to produce large noise when using the axial flow fan to carry out ventilation test research in urban areas.

[0006] The technical solution adopted by the application to solve the technical problems is:

[0007] An axial flow fan noise reduction and air volume regulation device, comprising a noise reduction and noise reduction cylinder and an air volume regulation assembly, one end of the noise reduction and noise reduction cylinder is used for communicating with the air outlet of the axial flow fan;

[0008] The air volume regulation assembly comprises a fixed petal body, a movable petal body and a driving mechanism arranged in the noise reduction and noise reduction cylinder. The fixed petal body is provided with an air volume regulation port, and the driving mechanism is used for driving the movable petal body to rotate around the center line of the noise reduction and noise reduction cylinder to open or close the air volume regulation port.

[0009] Further, the fixed petal body is provided with two air volume regulation ports, and the two air volume regulation ports are symmetrically arranged along the center line of the noise reduction and noise reduction cylinder.

[0010] Further, a plurality of fixed flap vents are arranged on the fixed flap, and a plurality of movable flap vents are arranged on the movable flap, and the fixed flap vents and the movable flap vents are arranged along the axial direction of the sound attenuation and noise reduction cylinder.

[0011] Further, when the fixed flap and the movable flap overlap, the fixed flap vents and the movable flap vents on the overlapping part of the fixed flap and the movable flap correspond to each other and are in communication.

[0012] Further, the air volume regulating assembly further comprises a center rod arranged at the center of the sound attenuation and noise reduction cylinder, the fixed flap is fixedly connected with the center rod, the movable flap is rotatably connected with the center rod, and the driving mechanism is connected between the center rod and the movable flap.

[0013] Further, the fixed flap comprises two fixed parts, the two fixed parts are arranged symmetrically with respect to the center line of the sound attenuation and noise reduction cylinder, and two air volume regulating openings are formed between the two fixed parts.

[0014] The movable flap comprises two movable parts, the two movable parts are arranged symmetrically with respect to the center line of the sound attenuation and noise reduction cylinder, and the two movable parts are respectively used for opening or closing the two air volume regulating openings.

[0015] Further, the sound attenuation and noise reduction cylinder comprises a support cylinder and a sound attenuation and noise reduction structure arranged on the inner surface of the support cylinder.

[0016] Further, the sound attenuation and noise reduction structure comprises a sound attenuation and noise reduction plate arranged on the inner surface of the support cylinder, the sound attenuation and noise reduction plate is provided with a wrinkle part away from the inner surface of the support cylinder, a sound attenuation and noise reduction cavity is formed between the wrinkle part and the inner surface of the support cylinder, and the wrinkle part is provided with a communication hole in communication with the inner cavity of the support cylinder and the sound attenuation and noise reduction cavity.

[0017] Further, the sound attenuation and noise reduction plate is in a cylindrical structure, and the sound attenuation and noise reduction cavity comprises at least two sound attenuation and noise reduction cavities arranged along the circumference of the support cylinder.

[0018] Further, the sound attenuation and noise reduction cylinder comprises a plurality of segments connected in series, and the air volume regulating assembly is arranged in each segment of the sound attenuation and noise reduction cylinder.

[0019] The beneficial effects of the present application are as follows:

[0020] The axial flow fan noise reduction and air volume regulation device provided by the embodiment of the application comprises a sound reduction and noise reduction cylinder, a sound reduction and noise reduction plate, a support cylinder, a fixed petal body, a movable petal body and a driving mechanism.BRIEF DESCRIPTION OF DRAWINGS BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 FIG. 1 is a structural schematic diagram of the axial flow fan noise reduction and air volume regulation device provided by the embodiment of the application;

[0023] Figure 2 FIG. 2 is a structural schematic diagram of the connection between the sound reduction and noise reduction cylinder and the air volume regulation assembly;

[0024] Figure 3 FIG. 3 is a sectional view along line A-A in FIG. 2; Figure 2

[0025] Figure 4 FIG. 4 is a structural schematic diagram of the air volume regulation assembly;

[0026] Figure 5 FIG. 5 is a structural schematic diagram of the fixed petal body;

[0027] Figure 6 FIG. 6 is a structural schematic diagram of the movable petal body;

[0028] Figure 7 FIG. 7 is a structural schematic diagram of the support cylinder;

[0029] Figure 8 FIG. 8 is a side view of the support cylinder;

[0030] Figure 9 FIG. 9 is a structural schematic diagram of the sound reduction and noise reduction plate;

[0031] Figure 10 Fig. 1 is a structural schematic diagram of a ventilation protective cover.

[0032] Reference signs:

[0033] 1 - axial flow fan;

[0034] 2 - sound reduction cylinder;

[0035] 21 - support cylinder;

[0036] 211 - positioning clamping block;

[0037] 22 - sound reduction plate;

[0038] 221 - wrinkle part; 2211 - communication hole; 222 - sound reduction cavity; 223 - positioning clamping groove;

[0039] 3 - air volume regulating assembly;

[0040] 31 - fixed petal;

[0041] 311 - fixed part; 3111 - fixed petal ventilation hole; 312 - air volume regulating port;

[0042] 32 - movable petal;

[0043] 321 - movable part; 3211 - movable petal ventilation hole;

[0044] 33 - driving mechanism;

[0045] 34 - center rod;

[0046] 35 - bracket;

[0047] 4 - ventilation protective cover;

[0048] 41 - protective cover flange;

[0049] 42 - protective net. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. The embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0051] In the description of the present application, the terms "upper", "lower", "left", "right", "front", "back", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise specified, the above orientation description can be flexibly arranged in the actual application process under the condition of meeting the relative positional relationship shown in the drawings.

[0052] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] Referring to Figures 1 to 6 , the present application provides a kind of axial flow fan sound attenuation and noise reduction and air volume regulation and control device, including sound attenuation and noise reduction cylinder 2 and air volume regulation and control component 3, one end of sound attenuation and noise reduction cylinder 2 is used to communicate with the air outlet of axial flow fan 1;Air volume regulation and control component 3 includes fixed petal body 31, movable petal body 32 and drive mechanism 33 arranged in sound attenuation and noise reduction cylinder 2, air volume regulation and control port 312 is provided on fixed petal body 31, drive mechanism 33 is used to drive movable petal body 32 rotates around the center line of sound attenuation and noise reduction cylinder 2, to open or close air volume regulation and control port 312.

[0054] Referring to Figure 1 , Figure 2 , sound attenuation and noise reduction cylinder 2 is the cylindrical structure of both ends opening, one end is used to communicate with the air outlet of axial flow fan 1, so that the airflow discharged from the air outlet of axial flow fan 1 can smoothly enter sound attenuation and noise reduction cylinder 2.In, sound attenuation and noise reduction cylinder 2 has sound attenuation and noise reduction function, can effectively absorb and reflect the sound wave energy in airflow, reduce the noise generated when airflow passes.Through flange bolt structure, sound attenuation and noise reduction cylinder 2 and axial flow fan 1 can be detachably connected together.The installation and disassembly process of flange bolt structure is relatively simple, only need to align the flange, insert bolt and tighten nut to complete the connection;When disassembling, only need to loosen the nut and remove the bolt to separate sound attenuation and noise reduction cylinder 2 from axial flow fan 1.Axial flow fan 1 includes but is not limited to existing multi-grade regulation axial flow fan 1.

[0055] Referring to Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6The air volume regulating assembly 3 is installed in the sound attenuation and noise reduction cylinder 2, and is used to realize linear air volume regulation, and mainly comprises a fixed petal body 31, a movable petal body 32 and a driving mechanism 33. The fixed petal body 31 is fixedly connected with the sound attenuation and noise reduction cylinder 2, and the fixed petal body 31 is provided with an air volume regulating port 312. The size of the air volume regulating port 312 determines the range of air flow regulation, and the shape and size thereof can be designed according to actual requirements, and are not specifically limited here.

[0056] The movable petal body 32 is movably installed in the sound attenuation and noise reduction cylinder 2 and can rotate around the center line of the sound attenuation and noise reduction cylinder 2. The shape and size of the movable petal body 32 are matched with the shape and size of the air volume regulating port 312. The movable petal body 32 adjusts the opening degree of the air volume regulating port 312 by rotating, and then adjusts the amount of air flow passing through the air volume regulating port 312, so as to realize linear air volume regulation.

[0057] The driving mechanism 33 serves as a power source and is used to drive the movable petal body 32 to rotate around the center line of the sound attenuation and noise reduction cylinder 2. The driving mechanism 33 can be realized in various ways, such as a motor, a pneumatic device or a manual adjusting device. For example, the motor is used as the driving mechanism 33, and the motor can be fixedly connected with the fixed petal body 31 or the sound attenuation and noise reduction cylinder 2, and the rotation of the output shaft of the motor drives the rotation of the movable petal body 32. The motor can realize accurate speed and angle control through a control circuit, so as to realize accurate air volume regulation. In addition, the driving mechanism 33 can be provided with a sensor and a feedback system for real-time monitoring of the position and opening angle of the movable petal body 32, so as to further improve the accuracy and reliability of air volume regulation.

[0058] The axial flow fan sound attenuation and noise reduction and air volume regulating device provided by the embodiment of the application comprises the air volume regulating assembly 3 mainly composed of the fixed petal body 31, the movable petal body 32 and the driving mechanism 33, the driving mechanism 33 drives the movable petal body 32 to rotate around the center line of the sound attenuation and noise reduction cylinder 2, the air volume regulating port 312 can be gradually opened or closed, the linear regulation of the size of the air volume regulating port 312 and the ventilation volume is realized, the linear regulation mode makes the axial flow fan be able to accurately regulate the air volume linearly according to the specific requirements in the urban area ventilation test research, meets the ventilation requirements in different scenes, and improves the applicability and flexibility of the axial flow fan in the urban ventilation test research. The sound attenuation and noise reduction cylinder 2 is arranged, the noise generated during the operation of the axial flow fan can be effectively reduced, the device is better adapted to the strict requirements of noise control in the urban area, a more quiet and comfortable living environment is created for urban residents, and the application value and acceptability of the axial flow fan in the urban ventilation test research are improved.

[0059] Compared with the existing multi-stage adjustment axial flow fan, the application installs the sound attenuation and noise reduction cylinder 2 at the air outlet of the axial flow fan 1, and installs the air volume regulation assembly 3 in the sound attenuation and noise reduction cylinder 2. Under the synergistic effect of the sound attenuation and noise reduction cylinder 2 and the air volume regulation assembly 3, not only the linear regulation of the air volume can be realized, but also the noise generated during the operation of the axial flow fan can be reduced, thereby meeting the dual needs of ventilation effect and noise control in urban area ventilation test research.

[0060] In some embodiments, referring to Figure 5 , the fixed petal body 31 is provided with two air volume regulation openings 312, which are symmetrically arranged along the center line of the sound attenuation and noise reduction cylinder 2. Correspondingly, the two air volume regulation openings 312 are symmetrically arranged along the center line of the sound attenuation and noise reduction cylinder 2, which can make the airflow more evenly distributed when passing through the sound attenuation and noise reduction cylinder 2. This symmetrical design not only can avoid the airflow deflection or vortex field caused by unilateral opening, thereby improving the stability and smoothness of the airflow, but also can avoid the structural deformation or damage caused by unilateral stress, thereby improving the service life of the air volume regulation assembly 3.

[0061] In some embodiments, referring to Figure 3 , Figure 4 , Figure 5 , Figure 6 , the fixed petal body 31 is provided with a plurality of fixed petal body ventilation holes 3111 arranged in an array, and the movable petal body 32 is provided with a plurality of movable petal body ventilation holes 3211 arranged in an array. The fixed petal body ventilation hole 3111 and the movable petal body ventilation hole 3211 are both arranged along the axial direction of the sound attenuation and noise reduction cylinder 2. Exemplarily, the fixed petal body ventilation hole 3111 and the movable petal body ventilation hole 3211 each include a plurality of groups arranged along the radial direction of the sound attenuation and noise reduction cylinder 2, and each group includes a plurality of holes uniformly distributed along the circumferential direction of the sound attenuation and noise reduction cylinder 2. These ventilation holes can also be designed to be of different sizes or spacings as needed, thereby realizing hierarchical air volume control; for example, the ventilation holes close to the center of the sound attenuation and noise reduction cylinder 2 can be designed to be smaller for low air volume adjustment, and the ventilation holes close to the edge can be designed to be larger for high air volume adjustment.

[0062] Correspondingly, by arranging the fixed petal body ventilation hole 3111 and the movable petal body ventilation hole 3211 in an array, a plurality of airflow channels can be provided, so that the airflow can be uniformly distributed through a plurality of small holes instead of only through one or a few large holes, thereby improving the uniformity and stability of the airflow. Since these ventilation holes are arranged along the axial direction of the sound attenuation and noise reduction cylinder 2, i.e., the airflow flows along the axial direction when passing through these ventilation holes, which helps to reduce the diffusion of the airflow in the radial direction, avoid the increase of turbulence and noise caused by airflow diffusion, and also helps to maintain the directional flow of the airflow, thereby improving the ventilation efficiency.

[0063] In some embodiments, referring to Figure 3 , Figure 4 ,Figure 5 、 Figure 6 When the fixed flap 31 and the movable flap 32 overlap, the fixed flap vents 3111 and the movable flap vents 3211 on the overlapping part are one-to-one corresponding and communicating. Correspondingly, when the movable flap 32 rotates to gradually open the air volume regulating port 312, the movable flap 32 will partially overlap the fixed flap 31. By one-to-one corresponding and communicating the fixed flap vents 3111 and the movable flap vents 3211 on the overlapping part, the movable flap 32 can avoid blocking the fixed flap vents 3111 on the fixed flap 31, and ensure the ventilation area of the fixed flap vents 3111 on the fixed flap 31.

[0064] Referring to Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 In the embodiment, the ventilation area S0 in the sound attenuation and noise reduction cylinder 2 is S1+S2+S3+S4; wherein S1 refers to the area between the outer circle of the fixed flap 31 and the movable flap 32 and the inner wall of the sound attenuation and noise reduction cylinder 2, S2 refers to the sum of the areas of all the fixed flap vents 3111 on the fixed flap 31, S3 refers to the sum of the areas of all the movable flap vents 3211 on the movable flap 32 which do not overlap with the fixed flap 31; and S4 refers to the area of the air volume regulating port 312. Among them, the larger the ventilation area S0 in the sound attenuation and noise reduction cylinder 2 is, the larger the ventilation volume is. In use, the movable flap 32 is driven to rotate by the driving mechanism 33 to linearly control the size of the air volume regulating port 312, so as to linearly adjust the ventilation area in the sound attenuation and noise reduction cylinder 2, and achieve the purpose of linear air volume regulation.

[0065] In some embodiments, referring to Figure 3 、 Figure 4 、 Figure 5 The air volume regulating assembly 3 further comprises a center rod 34 arranged at the center of the sound attenuation and noise reduction cylinder 2, the fixed flap 31 is fixedly connected with the center rod 34, the movable flap 32 is rotatably connected with the center rod 34, and the driving mechanism 33 is connected between the center rod 34 and the movable flap 32.

[0066] Specifically, the center rod 34 is arranged in the center of the sound reduction and noise reduction cylinder 2, and the two ends thereof are fixedly connected with the inner wall of the sound reduction and noise reduction cylinder 2 through the supports 35. Exemplarily, the support 35 is a cross-shaped structure supported on the inner wall of the sound reduction and noise reduction cylinder 2, and the center rod 34 is connected with the center of the cross-shaped structure. The fixed petal body 31 is fixedly connected with the center rod 34, thereby keeping a stable position in the sound reduction and noise reduction cylinder 2 and providing a rotating center shaft for the movable petal body 32. The driving mechanism 33 can include a hollow motor, the hollow motor is sleeved on the center rod 34, the stator of the hollow motor is connected with the center rod 34, and the rotor of the hollow motor is connected with the movable petal body 32. Power is provided by the hollow motor to drive the rotation around the center rod 34.

[0067] In some embodiments, referring to Figure 6 、 Figure 4 , the fixed petal body 31 includes two fixed parts 311, the two fixed parts 311 are symmetrically arranged with the center line of the sound reduction and noise reduction cylinder 2, and two air volume regulating openings 312 are formed between the two fixed parts 311; the movable petal body 32 includes two movable parts 321, the two movable parts 321 are symmetrically arranged with the center line of the sound reduction and noise reduction cylinder 2, and the two movable parts 321 are respectively used to open or close the two air volume regulating openings 312.

[0068] Exemplarily, the projections of the two fixed parts 311 and the two movable parts 321 on the plane perpendicular to the center line of the sound reduction and noise reduction cylinder 2 are 90° sector structures; the two fixed parts 311 are fixedly connected with the center rod 34, the two movable parts 321 are connected together and rotatably connected with the center rod 34 through a bearing, and the driving mechanism 33 is used to drive the two movable parts 321 to rotate simultaneously; a plurality of fixed petal body ventilation holes 3111 are arranged on each of the two fixed parts 311, and a plurality of movable petal body ventilation holes 3211 are arranged on each of the two movable parts 321.

[0069] Correspondingly, the symmetrically arranged fixed parts 311 and the symmetrically arranged movable parts 321 can make the airflow more uniformly distributed, reduce the turbulence and vortex phenomena of the airflow, thereby reducing the noise and improving the ventilation efficiency. The symmetric arrangement also makes the fixed petal body 31 and the movable petal body 32 more uniform when stressed, reduces the structural deformation or damage caused by asymmetric stress, thereby prolonging the service life of the device.

[0070] In some embodiments, referring to Figure 5 、 Figure 6 、 Figure 5 、 Figure 6 , the sound reduction and noise reduction cylinder 2 includes a support cylinder 21 and a sound reduction and noise reduction structure arranged on the inner surface of the support cylinder 21.

[0071] Correspondingly, the support cylinder 21 is a cylindrical structure with both ends open, which plays a supporting and fixing role. The support cylinder 21 can be made of high-strength metal material or composite material to ensure the stability and durability of its structure. For example, the support cylinder 21 is made of carbon steel or stainless steel. The two ends of the support cylinder 21 can be respectively provided with flanges, and one end is communicated with the air outlet of the axial flow fan 1 through a flange bolt structure. The sound-absorbing and noise-reducing structure is arranged on the inner surface of the support cylinder 21 and directly contacts the airflow, which can effectively absorb and reflect the sound wave energy in the airflow to reduce the noise. For example, the sound-absorbing and noise-reducing structure can include sound-absorbing materials or sound-absorbing plates arranged on the inner surface of the support cylinder 21.

[0072] In some embodiments, referring to Figure 2 、 Figure 3 、 Figure 7 The sound-absorbing and noise-reducing structure includes a sound-absorbing and noise-reducing plate 22 arranged on the inner surface of the support cylinder 21, the sound-absorbing and noise-reducing plate 22 is provided with a wrinkle part 221 away from the inner surface of the support cylinder 21, and a sound-absorbing and noise-reducing cavity 222 is formed between the wrinkle part 221 and the inner surface of the support cylinder 21, and the wrinkle part 221 is provided with a plurality of communication holes 2211 communicating the inner cavity of the support cylinder 21 and the sound-absorbing and noise-reducing cavity 222.

[0073] Correspondingly, by arranging the sound-absorbing and noise-reducing plate 22 on the inner surface of the support cylinder 21, the sound-absorbing and noise-reducing plate 22 can effectively absorb and reflect the sound wave energy in the airflow to reduce the propagation of noise; by arranging the wrinkle part 221 away from the inner surface of the support cylinder 21 on the sound-absorbing and noise-reducing plate 22, the surface area of the sound-absorbing and noise-reducing plate 22 is increased by the wrinkle part 221, which further improves the sound-absorbing and noise-reducing effect. The cross-sectional shape of the wrinkle part 221 can be wave-shaped, zigzag-shaped or trapezoidal-shaped, etc. By forming the sound-absorbing and noise-reducing cavity 222 between the wrinkle part 221 and the inner surface of the support cylinder 21, and arranging the communication holes 2211 on the wrinkle part 221, when the airflow flows in the sound-absorbing and noise-reducing cylinder 2, the sound wave energy in the airflow will enter the sound-absorbing and noise-reducing cavity 222 through the communication holes 2211 and be reflected and absorbed multiple times in the sound-absorbing and noise-reducing cavity 222, thereby significantly reducing the noise.

[0074] In some embodiments, the sound-absorbing and noise-reducing plate 22 is a cylindrical structure, and the sound-absorbing and noise-reducing cavity 222 includes at least two sound-absorbing and noise-reducing cavities 222 arranged along the circumference of the support cylinder 21. Each sound-absorbing and noise-reducing cavity 222 is a long strip-shaped structure extending along the axial direction of the support cylinder 21.

[0075] Correspondingly, the sound attenuation and noise reduction plate 22 adopts a cylindrical structure to form a sound attenuation and noise reduction lining. This structure not only increases the surface area of the sound attenuation and noise reduction plate 22, but also ensures its uniform distribution in the support cylinder 21. At least two sound attenuation and noise reduction cavities 222 are evenly distributed along the circumference of the support cylinder 21, which can guide the smooth flow of airflow and reduce the turbulence and vortex phenomenon of airflow. The pleat part 221 cooperates with the sound attenuation and noise reduction cavity 222 to form a multi-stage noise reduction structure, which can absorb sound waves of different frequencies, especially medium and high frequency sound waves. At the same time, multiple sound attenuation and noise reduction cavities 222 can further absorb low frequency sound waves, thereby achieving a wide frequency band noise reduction effect.

[0076] In order to facilitate the installation of the sound attenuation and noise reduction plate 22, the inner surface of the support cylinder 21 is provided with four positioning clamping blocks 211, each of which is a long strip structure extending along the axial direction of the support cylinder 21. The outer surface of the sound attenuation and noise reduction plate 22 is provided with four positioning clamping grooves 223, each of which is a long strip structure extending along the axial direction of the sound attenuation and noise reduction plate 22. The four positioning clamping blocks 211 correspond to the four positioning clamping grooves 223 respectively and form a positioning and fitting structure. During installation, the positioning clamping grooves 223 on the sound attenuation and noise reduction plate 22 are aligned with the positioning clamping blocks 211 on the support cylinder 21, and then the sound attenuation and noise reduction plate 22 is inserted into the support cylinder 21. The four positioning clamping blocks 211 are positioned and fitted in the four positioning clamping grooves 223 respectively, thereby installing the sound attenuation and noise reduction plate 22 in the support cylinder 21.

[0077] In some embodiments, referring to Figure 8 , the sound attenuation and noise reduction cylinder 2 includes multiple sections connected head to tail, and each section of the sound attenuation and noise reduction cylinder 2 is provided with a wind volume control assembly 3. Exemplarily, two adjacent sections of the sound attenuation and noise reduction cylinder 2 are connected through a flange bolt structure. Correspondingly, this structure can realize a wider range of adjustment of the ventilation volume through the series connection of multiple wind volume control assemblies 3, and meet the ventilation test research under more scenes or working conditions. The sound attenuation and noise reduction cylinder 2 is provided with a ventilation protective cover 4 at the end away from the axial flow fan 1. By providing the ventilation protective cover 4, foreign matters can be prevented from entering the sound attenuation and noise reduction cylinder 2, and accidental injuries can be avoided. At the same time, the ventilation protective cover 4 can also prevent the elements inside the sound attenuation and noise reduction cylinder 2 from flying out and injuring people in case of failure, thereby improving safety. Figure 2 Figure 3 Figure 9 Figure 1 Figure 10 , the ventilation protective cover 4 includes a protective cover flange 41 and a protective net 42 fixed in the protective cover flange 41. The protective cover flange 41 is used to connect with the flange at the end of the sound attenuation and noise reduction cylinder 2 through bolts.

[0078] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the present application can be easily thought of by those skilled in the art, which shall be covered within the protection scope of the present application.

Claims

1. A kind of axial flow fan sound attenuation noise reduction and air volume regulation device, it is characterized in that, The device comprises a silencing and noise reduction cylinder (2) and a wind volume regulating assembly (3), one end of the silencing and noise reduction cylinder (2) is used for communicating with the air outlet of the axial flow fan (1); The wind volume regulating assembly (3) comprises a fixed petal (31), a movable petal (32) and a driving mechanism (33) arranged in the silencing and noise reduction cylinder (2), the fixed petal (31) is provided with a wind volume regulating port (312), and the driving mechanism (33) is used for driving the movable petal (32) to rotate around the center line of the silencing and noise reduction cylinder (2) to open or close the wind volume regulating port (312).

2. The axial flow fan noise reduction and air volume regulation device according to claim 1, characterized in that, The fixed petal (31) is provided with two wind volume regulating ports (312), and the two wind volume regulating ports (312) are symmetrically arranged along the center line of the silencing and noise reduction cylinder (2).

3. The axial flow fan noise reduction and air volume regulation device according to claim 1 or 2, characterized in that, The fixed petal (31) is provided with a plurality of fixed petal ventilation holes (3111) arranged in an array, the movable petal (32) is provided with a plurality of movable petal ventilation holes (3211) arranged in an array, and the fixed petal ventilation holes (3111) and the movable petal ventilation holes (3211) are both arranged in the axial direction of the silencing and noise reduction cylinder (2).

4. The axial flow fan noise reduction and air volume control device according to claim 3, characterized in that, When the fixed petal (31) and the movable petal (32) overlap, the fixed petal ventilation holes (3111) and the movable petal ventilation holes (3211) on the overlapping part of the fixed petal (31) and the movable petal (32) correspond to each other and communicate.

5. The axial flow fan silencer, noise reducer and air volume regulator device according to claim 3, characterized in that, The wind volume regulating assembly (3) further comprises a center rod (34) arranged at the center of the silencing and noise reduction cylinder (2), the fixed petal (31) is fixedly connected with the center rod (34), the movable petal (32) is rotatably connected with the center rod (34), and the driving mechanism (33) is connected between the center rod (34) and the movable petal (32).

6. The axial flow fan silencer, noise reducer and air volume regulator device according to claim 3, characterized in that, The fixed petal (31) comprises two fixed parts (311), the two fixed parts (311) are symmetrically arranged along the center line of the silencing and noise reduction cylinder (2), and two wind volume regulating ports (312) are formed between the two fixed parts (311); The movable petal (32) comprises two movable parts (321), the two movable parts (321) are symmetrically arranged along the center line of the silencing and noise reduction cylinder (2), and the two movable parts (321) are respectively used for opening or closing the two wind volume regulating ports (312).

7. The axial flow fan silencer, noise reducer and air volume regulator device according to claim 1, characterized in that, The silencing and noise reduction cylinder (2) comprises a support cylinder (21) and a silencing and noise reduction structure arranged on the inner surface of the support cylinder (21).

8. The axial flow fan noise reduction and air volume regulation device according to claim 7, characterized in that, The silencing and noise reduction structure comprises a silencing and noise reduction plate (22) arranged on the inner surface of the support cylinder (21), the silencing and noise reduction plate (22) is provided with a wrinkle part (221) away from the inner surface of the support cylinder (21), a silencing and noise reduction cavity (222) is formed between the wrinkle part (221) and the inner surface of the support cylinder (21), and the wrinkle part (221) is provided with a communication hole (2211) communicating the inner cavity of the support cylinder (21) and the silencing and noise reduction cavity (222).

9. The axial flow fan noise reduction and air volume control device according to claim 8, characterized in that, The sound attenuation and noise reduction plate (22) is a cylindrical structure, and the sound attenuation and noise reduction cavities (222) are at least two, and the at least two sound attenuation and noise reduction cavities (222) are uniformly arranged along the circumference of the support cylinder (21).

10. The axial flow fan silencer, noise reducer and air volume regulator device according to claim 1, characterized in that, The sound attenuation and noise reduction cylinder (2) comprises multiple sections connected in a head-to-tail mode, and each section of the sound attenuation and noise reduction cylinder (2) is provided with the air volume regulation and control assembly (3).

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