Airflow silencing and guiding device for air power equipment

Abstract

The present invention discloses an airflow silencer and guide device for air power equipment, comprising a flow guide mechanism and a silencer mechanism, wherein the flow guide mechanism comprises a multi-stage flow guide silencer cone, a positioning bracket assembly, a protective cover and a docking flange, wherein the multi-stage flow guide silencer cone is stacked up and down and distributed in a gap-like manner, the positioning bracket assembly comprises a plurality of support rods and a connecting ring, the protective cover is arranged on the multi-stage flow guide silencer cone, the lower end of the docking flange is connected to the silencer mechanism, the silencer mechanism comprises a silencer body and a silencer cylinder, the silencer body is located inside the silencer cylinder, and a gap is provided between the silencer bodies, and the gap constitutes a ventilation duct; the airflow is poured into the inside of the protective cover from all sides through the ventilation holes on the protective cover, and after the airflow passes through the flow guide cone, an annular airflow is formed, and the airflow quickly enters the ventilation duct, and while the airflow passes through the ventilation duct, the noise is efficiently reduced by relying on the silencer cylinder and the silencer body constituting the two sides of the ventilation duct.

Description

Technical Field

[0001] The present invention relates to the technical field of aerodynamic noise prevention and control, and in particular to an airflow silencer and guide device for aerodynamic equipment. Background Art

[0002] With the development of industry, the creation and use of various mechanical equipment have brought prosperity and progress to mankind, and the material living standards of mankind have been greatly improved and enhanced, but at the same time, more and more and stronger noise has been generated. Long-term exposure to noise can cause deafness and may also cause high blood pressure, heart disease and other diseases; seriously affecting people's physical and mental health, increasing people's troubles, and reducing people's quality of life and work efficiency.

[0003] At present, in the fields of subways, tunnels, mining, etc., in order to eliminate harmful gases, most of the high-power fans are used, which generates a lot of noise. Therefore, it is necessary to use a muffler to eliminate this noise.

[0004] Air dynamic equipment will generate a lot of ventilation noise when it is running. Existing silencers are divided into high-end silencers and low-end silencers. Among them, high-end products have better silencer effect, but the structure design is complex, the manufacturing and debugging requirements are high, and the size is also relatively large, which makes the silencer expensive and inconvenient to install, and it cannot be widely popularized in actual use.

[0005] Low-end products of silencers have simple design and structure and are cheap, but they have poor durability and poor silencer effect. At the same time, the fan will generate extra noise, and will also generate extra energy consumption and maintenance costs for the fan. Summary of the invention

[0006] The purpose of the present invention is to provide an airflow silencer and guide device for aerodynamic equipment, which, after being guided by a guide mechanism and subjected to a first-stage noise reduction treatment, is then directed to a silencer mechanism for efficient noise reduction treatment, thereby greatly reducing the noise generated by the aerodynamic equipment and creating a good working environment.

[0007] The technical solution adopted by the present invention is:

[0008] An airflow silencer and guide device for air dynamic equipment comprises a flow guide mechanism and a silencer mechanism, wherein the flow guide mechanism comprises a multi-stage flow guide and silencer cone, a positioning bracket assembly, a protective cover and a docking flange, wherein the multi-stage flow guide and silencer cones are stacked up and down and distributed in a gap manner, wherein each stage comprises a flow guide cone with an inverted cone structure, wherein the upper edge of the flow guide cone extends outward in parallel to form an annular support platform, wherein the tip of the flow guide cone is provided with an opening, and a flow guide tube is connected to the opening; the flow guide cone opening of each stage of the flow guide and silencer cone gradually increases, and the diameter of the flow guide tube gradually increases; the inner and outer surfaces of the flow guide cone and the flow guide tube are paved with sound insulation felt; the positioning bracket assembly comprises a plurality of support rods and a connecting ring, wherein the support rods are arranged between the supporting platforms of each stage of the flow guide and silencer cone, and the lower ends of the support rods below the supporting platforms of the last stage of the flow guide and silencer cone are fixed to the upper end surface of the connecting ring , the connecting ring is connected to the upper end face of the docking flange; the protective cover is a cylindrical structure with an opening at the lower end, and a plurality of ventilation holes are evenly opened on the protective cover. The protective cover is arranged on the multi-stage flow-guiding silencer cone, and the lower end of the protective cover is fixed to the upper end face of the connecting ring; the lower end of the docking flange is connected to the silencer mechanism; the silencer mechanism includes a silencer body and a silencer cylinder, and the silencer body is located inside the silencer cylinder, and there is a gap between them; the silencer cylinder includes a cylindrical bracket, the inside of the cylindrical bracket is filled with sound-absorbing material, the outer periphery of the cylindrical bracket is wrapped with a flexible sound insulation board, and connecting flanges are respectively installed at both ends of the cylindrical bracket, and the connecting flange at the upper end is matched and connected with the docking flange of the flow-guiding mechanism; the silencer body is an ellipsoidal structure with a width in the middle and a narrowness at both ends, and the two ends of the silencer body are respectively connected to a support frame, and the support frame is connected to the inner cylinder wall; the silencer body is made of silencer material.

[0009] The multi-stage guide silencer cone adopts three stages, including an upper-stage guide silencer cone, an intermediate-stage guide silencer cone and a final-stage guide silencer cone. The guide tube suspension of the upper-stage guide silencer cone is located in the guide cone of the intermediate-stage guide silencer cone, the guide tube suspension of the intermediate-stage guide silencer cone is located in the guide cone of the final-stage guide silencer cone, and the lower end of the guide tube of the final-stage guide silencer cone is located above the connecting ring.

[0010] The upper-stage flow-guiding silencer cone, the middle-stage flow-guiding silencer cone and the final-stage flow-guiding silencer cone are all made of metal plates or rubber or plastic.

[0011] The protective cover is made of a porous plate; the top of the protective cover is welded to the support platform of the upper guide silencer cone, and the inner side wall of the protective cover is welded and fixed to the outer edge of the support platform of the third guide silencer cone; the lower edge of the protective cover is fixed to the upper end face of the connecting ring.

[0012] The cylindrical bracket includes shaping rings at both ends and four supporting columns. The four supporting columns are arranged in a regular quadrilateral structure, and the two ends of the four supporting columns are inscribed and fixed with the corresponding shaping rings. A plurality of reinforcing rings are distributed between the two shaping rings. The four supporting columns form a cubic inner frame. Resistive sound-absorbing strips are installed at the four corners of the cubic inner frame. The inner tangent surface of the resistive sound-absorbing strip is an arc surface protruding outward. The two shaping rings and the reinforcing ring form a cylindrical outer frame. The gap between the inner frame and the outer frame is filled with sound-absorbing material, and the outer frame is wrapped with a flexible sound insulation board. A sound-absorbing protective cloth is provided on the inner side wall of the sound-absorbing material.

[0013] The flexible sound insulation board comprises a sound-absorbing layer of a central layer, the outer periphery of the sound-absorbing layer is covered with a waterproof and antistatic fiber protective layer, and the outer layer of the waterproof and antistatic fiber protective layer is covered with a flexible antistatic and flame-retardant layer; the sound-absorbing layer adopts a fiber-type, foam-type or granular material with sound-absorbing function, and the corresponding sound-absorbing material is selected according to the wavelength and frequency of the sound wave; the waterproof and antistatic fiber protective layer adopts a non-woven fabric with waterproof and antistatic functions; the flexible antistatic and flame-retardant layer is composed of a flexible flame-retardant and antistatic non-woven fabric coated with an elastic environmentally friendly damping material.

[0014] The muffler comprises a muffler shell, which is made of a porous plate. A sound-absorbing protective cloth is laid on the inner wall of the muffler shell, and a sound-absorbing material is wrapped in the sound-absorbing protective cloth.

[0015] The support frame adopts four support rods, one end of the four support rods is fixed to the tip of the muffler, and the other end is fixed to four right angles of the inner tube respectively.

[0016] The sound absorbing material is one or more of organic fiber material, inorganic fiber material, glass fiber wool, rock wool, mineral wool or granular sound absorbing material.

[0017] The sound-absorbing protective cloth is made of sound-insulating felt or supramolecular sound-absorbing film.

[0018] The present invention utilizes three-stage flow-guiding silencer cones, which are stacked up and down and distributed in a gap-like manner. The opening of the flow-guiding silencer cone of each stage gradually increases, and the diameter of the flow-guiding tube gradually increases. The three-stage flow-guiding silencer cone is coaxially installed and fixed from top to bottom, and an air flow channel of a gradually expanding flow-guiding tube connected to an air inlet port is formed in the flow-guiding cone, and an annular air inlet is formed at the air inlet port, so that gas can enter the multi-stage flow-guiding silencer cone along the radial direction and the annular air inlet, and the air flow can enter the multi-stage flow-guiding silencer cone from the circumferential direction, thereby reducing the air flow noise from the source of the air intake, and minimizing the air flow noise while ensuring the ventilation efficiency.

[0019] At the same time, the inner and outer surfaces of the guide cone and guide tube are covered with sound insulation felt. When the wind enters the protective cover, it collides and impacts the inner and outer surfaces of the guide cone and guide tube. The noise carried by the wind itself and the noise generated by the collision are absorbed by the sound insulation felt, thereby reducing noise for the first time.

[0020] Furthermore, a silencer mechanism is used to achieve efficient noise reduction, mainly using a silencer and a silencer tube. The silencer tube is filled with sound-absorbing materials to facilitate noise absorption. The silencer is an ellipsoidal structure that is wide in the middle and narrow at both ends. The silencer shell is made of a porous plate and is filled with sound-absorbing materials. The gap between the silencer tube and the silencer body forms an annular ventilation duct. While the airflow passes through the ventilation duct, the noise is efficiently reduced by the silencer tube and the silencer body on both sides of the ventilation duct. Among them, the silencer body adopts an ellipsoidal structure with a certain arc shape, which can make the air flow smooth, ensure the air intake of the fan, and meet the use requirements of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a perspective structural schematic diagram of the flow guiding mechanism of the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the flow-guiding and muffler cone of the flow-guiding mechanism of the present invention;

[0024] Figure 4 It is a perspective structural schematic diagram of the muffler mechanism of the present invention;

[0025] Figure 5 is a cross-sectional view of the muffler mechanism of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the flexible sound insulation board of the present invention. DETAILED DESCRIPTION

[0027] like Figure 1-6 As shown, Figure 1-5As shown, the present invention includes a guide mechanism A and a silencer mechanism B, wherein the guide mechanism A includes a multi-stage guide silencer cone 1, a positioning bracket assembly, a protective cover 2 and a docking flange 3, wherein the multi-stage guide silencer cone 1 is stacked up and down and distributed in a gap manner, wherein each stage includes a guide cone 4 with an inverted cone structure, wherein the upper edge of the guide cone 4 extends outward in parallel to form an annular support platform 5, wherein an opening is provided at the tip of the guide cone 4, and a guide tube 6 is connected to the opening; wherein the opening of the guide cone 4 of each stage of the guide silencer cone 1 gradually decreases, and the diameter of the guide tube 6 gradually increases; and the inner surface of the guide cone 4 and the guide tube 6 The inner and outer surfaces are paved with sound insulation felt 7; the positioning bracket assembly includes multiple support rods 8 and connecting rings 9, the support rods 8 are arranged between the support platforms 5 of each stage of the guide silencer cone 1, the lower ends of the support rods 8 below the support platforms 5 of the last stage of the guide silencer cone are fixed to the upper end surface of the connecting ring 9, and the connecting ring 9 is connected to the upper end surface of the docking flange 3; the protective cover 2 is a cylindrical structure with an open lower end, and a plurality of ventilation holes are evenly opened on the protective cover 2. The protective cover 2 is arranged on the multi-stage guide silencer cone 1, and the lower end of the protective cover 2 is fixed to the upper end surface of the connecting ring 9; the lower end of the docking flange 3 is connected to the silencer mechanism B.

[0028] like Figure 3 As shown, the multi-stage flow guide silencer cone 1 adopts three stages, including an upper-stage flow guide silencer cone, an intermediate-stage flow guide silencer cone and a final-stage flow guide silencer cone. The flow guide tube 6 of the upper-stage flow guide silencer cone is suspended in the flow guide cone 4 of the intermediate-stage flow guide silencer cone, and the flow guide tube 6 of the intermediate-stage flow guide silencer cone is suspended in the flow guide cone 4 of the final-stage flow guide silencer cone. The lower end of the flow guide tube 6 of the final-stage flow guide silencer cone is located above the connecting ring 9. The present invention is not limited to three stages, and one, two, four, five, etc. stages can be adopted according to the environmental use conditions.

[0029] The upper-stage flow-guiding silencer cone, the middle-stage flow-guiding silencer cone and the final-stage flow-guiding silencer cone are all made of metal plates or rubber or plastic.

[0030] like Figure 2 As shown, the protective cover 2 is made of a porous plate; the top of the protective cover 2 is welded to the support platform 5 of the upper guide silencer cone, and the inner side walls of the protective cover 2 are respectively welded and fixed to the outer edges of the support platform 5 of the third-level guide silencer cone 1; the lower edge of the protective cover 2 is fixed to the upper end face of the connecting ring 9.

[0031] like Figure 4-5As shown, the silencer mechanism includes a silencer body and a silencer tube, the silencer body is located inside the silencer tube with a gap therebetween; the silencer tube includes a cylindrical bracket, the inside of the cylindrical bracket is filled with sound-absorbing material, the outer periphery of the cylindrical bracket is wrapped with a flexible sound insulation board 13, connecting flanges 12 are respectively installed at both ends of the cylindrical bracket, and the connecting flange 12 at the upper end is matched and connected with the docking flange 3 of the guide mechanism; the silencer body is an ellipsoidal structure that is wide in the middle and narrow at both ends, and the two ends of the silencer body are respectively connected to a support frame, and the support frame is connected to the inner tube wall; the silencer body is made of silencer material.

[0032] The cylindrical bracket includes shaping rings 18 at both ends and four support columns 14. The four support columns 14 are arranged in a regular quadrilateral structure, and the two ends of the four support columns are inscribed and fixed with the corresponding shaping rings 18. A plurality of reinforcing rings 19 are distributed between the two shaping rings 18. The four support columns 14 form a cubic inner frame. Resistive sound absorbing strips 23 are installed at the four corners of the cubic inner frame. The inner side surface of the resistive sound absorbing strip 23 is an arc surface protruding outward, and the two right-angled surfaces of the resistive sound absorbing strip 23 fit the corners; the two shaping rings 18 and the reinforcing rings 19 form a cylindrical outer frame, the gap between the inner frame and the outer frame is filled with sound absorbing material, and the outer frame is wrapped with a flexible sound insulation board 13; the inner wall of the sound absorbing material is provided with a sound absorbing protective cloth 15.

[0033] like Figure 6 As shown, the flexible sound insulation board includes a sound-absorbing layer 20 of a central layer, a waterproof and antistatic fiber protective layer 21 wrapped around the sound-absorbing layer, and a flexible antistatic and flame-retardant layer 22 covered on the outer layer of the waterproof and antistatic fiber protective layer; the sound-absorbing layer adopts a fiber-type, foam-type or granular material with sound-absorbing function, and the corresponding sound-absorbing material is selected according to the wavelength and frequency of the sound wave; the waterproof and antistatic fiber protective layer adopts a non-woven fabric with waterproof and antistatic functions; the flexible antistatic and flame-retardant layer is composed of a flexible flame-retardant and antistatic non-woven fabric coated with an elastic environmentally friendly damping material.

[0034] The muffler body comprises a muffler shell 16 which is made of a porous plate. A sound-absorbing protective cloth 15 is laid on the inner wall of the muffler shell 16 and a sound-absorbing material is wrapped in the sound-absorbing protective cloth 15 .

[0035] The support frame 17 is composed of four support rods, one end of which is fixed to the tip of the muffler, and the other end is fixed to four right angles of the inner tube 11 .

[0036] The sound absorbing material is one or more of organic fiber material, inorganic fiber material, glass fiber wool, rock wool, mineral wool or granular sound absorbing material.

[0037] The sound absorbing protective cloth 15 is made of sound insulation felt or supramolecular sound absorbing film.

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The present invention is assembled from two parts, including a flow guide mechanism A and a silencer mechanism B, which are butt-jointed via a flange. The specific structure is as follows:

[0040] The flow guiding mechanism A mainly relies on the three-stage flow guiding and silencer cone 1 to guide and smooth the flow of the air. The three-stage flow guiding and silencer cone 1 is stacked up and down and distributed in a gap-like manner. The opening of the flow guiding cone 4 of each level of the flow guiding and silencer cone 1 gradually decreases, and the diameter of the flow guiding tube 6 gradually increases. Of course, not only three levels can be used, but also two, four, and five levels can be set according to the use environment. The opening of the flow guiding cone 4 gradually decreases, and the diameter of the flow guiding tube 6 gradually increases. On the one hand, it ensures that the airflow discharged from the upper level flow guiding tube 6 can be smoothly introduced into the air inlet of the ventilator, and on the other hand, it ensures that the airflow of this level can smoothly pass through the flow guiding tube 6 of this level. The three-stage flow guide and silencer cone 1 is coaxially installed and fixed from top to bottom, and an air flow channel of a gradually expanding flow guide tube 6 connected to the air inlet port is formed in the flow guide cone 4, and an annular air inlet is formed at the air inlet port, which can enable the gas to enter the multi-stage flow guide and silencer cone 1 along the axial direction and the annular air inlet, and enable the airflow to enter the multi-stage flow guide and silencer cone 1 from the circumferential direction, thereby reducing the airflow noise from the source of the air intake, and minimizing the airflow noise while ensuring the ventilation efficiency.

[0041] In addition, the three-stage guide silencer cone 1 is made of metal plates or rubber or plastic molding, and uses lightweight alloy plates. The alloy plates can prevent corrosion in humid environments on the one hand, and on the other hand, they are lightweight, reducing the installation effort and the weight of the overall equipment, and reducing the pressure on the main equipment.

[0042] At the same time, since the inner and outer surfaces of the guide cone 4 and the guide tube 6 are covered with sound insulation felt 7, when the airflow enters the protective cover 2, it collides and impacts with the inner and outer surfaces of the guide cone 4 and the guide tube 6, and the noise carried by the airflow itself and the noise generated by the collision are absorbed by the sound insulation felt 7, thereby reducing the noise.

[0043] When designing the construction, the device uses a positioning bracket assembly for support and positioning. The support rod 8 is arranged between the support platforms 5 of each level of the guide silencer cone 1. The function of the support rod 8 is to support the guide silencer cone 1 of each level, so that there is a certain space between the upper and lower levels of the guide silencer cone 1 to facilitate the entry of airflow. It not only plays a supporting role, but also plays a certain limiting positioning role, controlling the spacing between the upper and lower guide silencer cones 1 at a certain distance, which ensures high ventilation volume and good noise reduction effect. After repeated experiments, it was found that the best effect is to set the lower end of the upper guide tube 6 1-3cm above the next level guide tube 6.

[0044] When connected with the muffler mechanism B, the present invention designs a docking flange 3, through which a firm connection is achieved, and disassembly and installation are convenient, saving time and effort.

[0045] The silencer mechanism B of the present invention mainly adopts a silencer body and a silencer tube, and the silencer body is suspended in the center of the silencer tube; the silencer tube includes a cylindrical bracket, the inside of the cylindrical bracket is filled with sound-absorbing material, and the outer periphery of the cylindrical bracket is wrapped with a flexible sound insulation board 13, and connecting flanges 12 are respectively installed at both ends of the cylindrical bracket, the connecting flange 12 at the upper end is matched and connected with the docking flange 3 of the guide mechanism, and the connecting flange at the lower end is used to connect to the air inlet of the ventilator. Among them, the cylindrical bracket includes shaping rings 18 at both ends and four support columns 14, the four support columns 14 are arranged in a regular quadrilateral structure, and the two ends of the support columns 14 are inscribed and fixed with the corresponding shaping rings 18, and multiple reinforcement rings 19 are distributed between the two shaping rings 18. The four support columns 14 form a cubic inner frame, and resistive sound-absorbing strips 23 are installed at the four corners of the cubic inner frame. The inner section of the resistive sound-absorbing strip 23 is an arc surface protruding outward. The two shaping rings 18 and the reinforcement rings 19 form a cylindrical outer frame, and the gap between the inner frame and the outer frame is filled with sound-absorbing material. The outer frame is wrapped with a flexible sound insulation board 13; a sound-absorbing protective cloth 15 is provided on the inner side wall of the sound-absorbing material. The four support columns 14 are made of angle steel, and the shaping ring 18 is made of stainless steel ring. The metal material with certain hardness and rigidity is used to protect and support. The inner wall of the sound-absorbing material forms a square structure, combined with the resistive sound-absorbing strip 23 installed at the corner of the square structure. Since the inner side of the resistive sound-absorbing strip 23 is an arc surface protruding outward, it interferes with the airflow direction and is used to overcome the vortex effect of the power equipment. The diameter of the outer frame is similar to that of the air power equipment, which is convenient for matching the existing fan model and easy to install. The inner wall of the sound-absorbing material is provided with a sound-absorbing protective cloth 15, which is made of sound insulation felt or supramolecular sound-absorbing film to absorb noise.

[0046] It is not enough to only use sound-absorbing materials and flexible sound insulation boards to absorb sound, so the present invention designs a silencer structure. The silencer is an ellipsoidal structure that is wide in the middle and narrow at both ends. The silencer shell 16 is made of a porous plate. A sound-absorbing protective cloth 15 is laid on the inner wall of the silencer shell 16, and the sound-absorbing protective cloth 15 is wrapped with sound-absorbing material. The support frames 17 at both ends are then used to suspend in the center of the silencer. The support frame 17 uses four support rods 8, one end of the four support rods 8 is centrally fixed to the tip of the silencer, and the other end is respectively fixed to the four right angles of the inner tube 11. The support frame 17 is in the shape of a four-sided cone, which is more solid. During the high-speed impact of the airflow, the frontal impact force of the airflow is reduced to achieve the effect of reducing pressure, which is more solid and reliable.

[0047] The flexible sound insulation board is mainly composed of a sound-absorbing layer 20 in the center layer. The sound-absorbing layer 20 is made of fiber-type, foam-type or granular material with sound-absorbing function. Different sound-absorbing materials can be configured according to different external environments to meet multi-environment and multi-condition applications. In order to further achieve the waterproof and anti-static effect, a waterproof and anti-static fiber protective layer 21 is wrapped around the outer periphery of the sound-absorbing layer. A non-woven fabric with waterproof and anti-static function is used. The sound-absorbing layer is fully wrapped by the waterproof and anti-static fiber protective layer to prevent leakage of the sound-absorbing layer material. Finally, a flexible antistatic flame retardant layer 22 is covered on the outer layer of the waterproof and antistatic fiber protective layer. The flexible flame retardant antistatic non-woven fabric is coated with an elastic environmentally friendly damping material. The air duct cloth or silicone cloth, the elastic environmentally friendly damping material or the environmentally friendly damping material with a polymer can be used. On the one hand, the elasticity and waterproofness of the flexible flame retardant antistatic non-woven fabric are enhanced. On the other hand, it has a solid shaping effect on the flame retardant antistatic non-woven fabric, so that the flame retardant antistatic non-woven fabric has a certain flexibility and plasticity, and can enhance the toughness and wear resistance of the flame retardant antistatic non-woven fabric.

[0048] The gap between the silencer and the silencer body forms a circular ventilation duct. When the airflow passes through the ventilation duct, the silencer and the silencer body on both sides of the ventilation duct are used to effectively reduce the noise. Among them, the silencer body adopts an ellipsoidal structure with a certain arc shape, which can reduce the airflow resistance and smooth the flow, ensure the air intake of the fan, and meet the requirements of the fan. Not only the ellipsoidal structure, but also the structure of two symmetrical cones can be used, and any structure with a certain arc shape can be used.

[0049] The sound absorbing material is one or more of organic fiber material, inorganic fiber material, glass fiber wool, rock wool, mineral wool or granular sound absorbing material. The sound absorbing material can select different structural factors and different types and densities of sound absorbing materials according to the spectrum characteristics of the noise source; all have good sound absorbing effects, and different materials can be filled according to different use environments to achieve the best sound absorbing effect.

[0050] The working principle of the present invention is as follows: first, the guide mechanism A and the silencer mechanism B are connected through the docking flange 3, and then connected to the air inlet of the ventilator through the connecting flange 12 of the silencer mechanism B. When the ventilator is started, the airflow is poured into the interior of the protective cover 2 from all sides through the ventilation holes on the protective cover 2, and the airflow entering the upper end of the interior of the protective cover 2 enters through the large mouth of the guide cone 4 of the conical structure of the upper guide and silencer cone. After the airflow passes through the guide cone 4, an annular airflow is formed, and then the airflow enters the guide cone 4 of the intermediate guide and silencer cone through the guide tube 6 of the upper guide and silencer cone; the airflow entering from the middle part of the protective cover 2 directly enters the guide cone 4 of the conical structure of the intermediate guide and silencer cone, and passes through the guide cone 4. After that, an annular airflow is formed, and then enters the guide cone 4 of the final guide silencer cone through the guide tube 6 of the intermediate guide silencer cone 1; similarly, the airflow entering from the lower part of the protective cover 2 directly enters the guide cone 4 of the conical structure of the final guide silencer cone, and after passing through the guide cone 4, an annular airflow is formed, and then enters the ventilation duct of the silencer mechanism B through the guide tube 6 of the final guide silencer cone. When the airflow passes through the ventilation duct, the silencer tubes and silencers on both sides of the ventilation duct perform efficient noise reduction processing on the noise.

[0051] The invention is easy to install and has a good noise reduction effect; it is installed on the air flow channel or the intake and exhaust system of the air power equipment and can effectively reduce the ventilation noise.

[0052] The present invention adopts a radial annular air inlet method and uses a conical structure at the front air inlet to reduce the propagation of noise in the axial direction. Through the guidance of the guide cone and the guide tube, the propagation path of the noise is changed, and the noise is absorbed and attenuated. At the same time, the aerodynamic performance of the fan is also improved.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An airflow silencing and guiding device for aerodynamic equipment, characterized in that: It includes a guide mechanism and a silencer mechanism, the guide mechanism includes a multi-stage guide silencer cone, a positioning bracket assembly, a protective cover and a docking flange, the multi-stage guide silencer cone is stacked up and down and distributed in a gap manner, each stage includes an inverted cone structure guide cone, the upper edge of the guide cone extends outward in parallel to form an annular support platform, the tip of the guide cone is provided with an opening, and a guide tube is connected to the opening; the guide cone opening of each stage of the guide silencer cone gradually increases, and the diameter of the guide tube gradually increases; the inner and outer surfaces of the guide cone and the guide tube are paved with sound insulation felt; the positioning bracket assembly includes a plurality of support rods and a connecting ring, the support rods are arranged between the support platforms of each stage of the guide silencer cone, the lower end of the support rod below the support platform of the last stage of the guide silencer cone is fixed to the upper end face of the connecting ring, and the connecting ring is connected to the docking flange The upper end face is connected; the protective cover is a cylindrical structure with an opening at the lower end, and a plurality of ventilation holes are evenly opened on the protective cover. The protective cover is arranged on the multi-stage flow-guiding silencer cone, and the lower end of the protective cover is fixed to the upper end face of the connecting ring; the lower end of the docking flange is connected to the silencer mechanism; the silencer mechanism includes a silencer body and a silencer tube, and the silencer body is located inside the silencer tube, and there is a gap between them; the silencer tube includes a cylindrical bracket, the inside of the cylindrical bracket is filled with sound-absorbing material, the outer periphery of the cylindrical bracket is wrapped with a flexible sound insulation board, and connecting flanges are respectively installed at both ends of the cylindrical bracket, and the connecting flange at the upper end is matched and connected with the docking flange of the flow-guiding mechanism; the silencer body is an ellipsoidal structure with a width in the middle and a narrowness at both ends, and the two ends of the silencer body are respectively connected to a support frame, and the support frame is connected to the inner tube wall; the silencer body is made of silencer material; The multi-stage flow-guiding silencer cone adopts three stages, including an upper-stage flow-guiding silencer cone, an intermediate-stage flow-guiding silencer cone and a final-stage flow-guiding silencer cone. The flow-guiding tube suspension of the upper-stage flow-guiding silencer cone is located in the flow-guiding cone of the intermediate-stage flow-guiding silencer cone, the flow-guiding tube suspension of the intermediate-stage flow-guiding silencer cone is located in the flow-guiding cone of the final-stage flow-guiding silencer cone, and the lower end of the flow-guiding tube of the final-stage flow-guiding silencer cone is located above the connecting ring. The muffler comprises a muffler shell, which is made of a porous plate. A sound-absorbing protective cloth is laid on the inner wall of the muffler shell, and a sound-absorbing material is wrapped in the sound-absorbing protective cloth.

2. The airflow silencing and guiding device for aerodynamic equipment according to claim 1, characterized in that: The upper-stage flow-guiding silencer cone, the middle-stage flow-guiding silencer cone and the final-stage flow-guiding silencer cone are all made of metal plates or rubber or plastic.

3. The airflow silencing and guiding device for aerodynamic equipment according to claim 1, characterized in that: The protective cover is made of a porous plate; the top of the protective cover is welded to the support platform of the upper guide silencer cone, and the inner side wall of the protective cover is welded and fixed to the outer edge of the support platform of the third guide silencer cone; the lower edge of the protective cover is fixed to the upper end face of the connecting ring.

4. The airflow silencing and guiding device for aerodynamic equipment according to claim 1, characterized in that: The cylindrical bracket includes shaping rings at both ends and four supporting columns. The four supporting columns are arranged in a regular quadrilateral structure, and the two ends of the four supporting columns are inscribed and fixed with the corresponding shaping rings. A plurality of reinforcing rings are distributed between the two shaping rings. The four supporting columns form a cubic inner frame. Resistive sound-absorbing strips are installed at the four corners of the cubic inner frame, and the inner side of the resistive sound-absorbing strip is an arc surface protruding outward; the two shaping rings and the reinforcing ring form a cylindrical outer frame, the gap between the inner frame and the outer frame is filled with sound-absorbing material, and the outer frame is wrapped with a flexible sound insulation board; the inner side wall of the sound-absorbing material is provided with a sound-absorbing protective cloth.

5. The airflow silencing and guiding device for aerodynamic equipment according to claim 1 or 4, characterized in that: The flexible sound insulation board comprises a sound-absorbing layer of a central layer, the outer periphery of the sound-absorbing layer is covered with a waterproof and antistatic fiber protective layer, and the outer layer of the waterproof and antistatic fiber protective layer is covered with a flexible antistatic and flame-retardant layer; the sound-absorbing layer adopts a fiber-type, foam-type or particle-type material with sound-absorbing function, and the corresponding sound-absorbing material is selected according to the wavelength and frequency of the sound wave; the waterproof and antistatic fiber protective layer adopts a non-woven fabric with waterproof and antistatic functions; the flexible antistatic and flame-retardant layer is composed of a flexible flame-retardant and antistatic non-woven fabric coated with an elastic environmentally friendly damping material.

6. The airflow silencing and guiding device for aerodynamic equipment according to claim 1, characterized in that: The support frame adopts four support rods, one end of the four support rods is fixed to the tip of the muffler, and the other end is fixed to four right angles of the inner tube respectively.

7. The airflow silencing and guiding device for aerodynamic equipment according to claim 1 or 4, characterized in that: The sound absorbing material is made of organic fiber material or inorganic fiber material.

8. The airflow silencing and guiding device for aerodynamic equipment according to claim 4, characterized in that: The sound-absorbing protective cloth is made of sound-insulating felt or supramolecular sound-absorbing film.

Images