Composite metamaterial silencing device based on perforated plate and slit resonance sound absorption and its preparation and assembly process

Abstract

The present invention discloses a composite metamaterial silencing device based on perforated plate and slit resonance sound absorption and its preparation and assembly process. The device is composed of four metamaterial silencing units connected in pairs to form an airflow channel inside. Each metamaterial silencing unit includes an outer ring silencing structure and an inner ring silencing structure that cooperate with each other. The inner ring silencing structure includes a number of U-shaped rectangular tubes, rectangular tube connectors, inner frame plates, head rectangular materials and inner perforated plates; the outer ring silencing structure includes a corner head, an outer frame plate, an outer perforated plate and a light plate. The present invention designs the metamaterial silencing unit into a modular structure composed of an outer ring silencing structure and an inner ring silencing structure, and the preparation process of each component is simple and novel, and all materials can be fully utilized during the preparation process; at the same time, the assembly between the various components is simple and reliable, and can be completed by simple assembly in actual use, without the need to be fully assembled when leaving the factory, so that the product is light and easy to carry when leaving the factory, reducing transportation costs.

Description

Technical Field

[0001] The invention belongs to the technical field of sound elimination, and in particular relates to a composite metamaterial sound elimination device based on perforated plate and slit resonance sound absorption. Background Art

[0002] Metamaterial silencing devices are mainly used to silence low- and medium-frequency sounds. For example, HVAC inlets and outlets or other equipment with inlets and outlets can play a very good role in silencing after being installed with metamaterial silencing devices.

[0003] However, the manufacturing process of conventional metamaterial silencing devices is limited by the shape and size of the product. It cannot be modularly customized during the manufacturing process. Each component of each product is manufactured in sets according to the shape and size of the product. The manufacturing process is relatively rigid, and a lot of materials will be wasted during the manufacturing process.

[0004] At the same time, the assembly process of conventional metamaterial silencers is also affected by the performance and structure of the product. They are basically fully assembled when leaving the factory, and there is no possibility of self-assembly later. Therefore, each product will be relatively bulky, difficult to carry, and have high transportation costs. Summary of the invention

[0005] In order to solve the defects and shortcomings in the above-mentioned prior art, the present invention provides a metamaterial silencing unit designed as a modular structure consisting of an outer ring silencing structure and an inner ring silencing structure, and the preparation process of each component is simple and novel, and all materials can be fully utilized during the preparation process; at the same time, the assembly between the various components is simple and reliable, and can be completed by simple assembly in actual use situations, without the need to be fully assembled when leaving the factory, so that the product is light and easy to carry when leaving the factory, and the transportation cost is reduced. A composite metamaterial silencing device based on perforated plate and slit resonance sound absorption.

[0006] The technical solution of the present invention is a composite metamaterial silencing device based on perforated plate and slit resonance sound absorption, which is composed of four metamaterial silencing units connected in pairs to form an air flow channel inside, and each metamaterial silencing unit includes an outer ring silencing structure and an inner ring silencing structure that cooperate with each other.

[0007] The inner ring sound-absorbing structure comprises a plurality of U-shaped rectangular tubes, a rectangular tube connector connecting the plurality of U-shaped rectangular tubes, an inner frame plate connecting the rectangular tube connectors, a head rectangular material sealing both ends of the inner frame plate, and an inner perforated plate connected to one side of the inner frame plate, one of the side walls of every two adjacent U-shaped rectangular tubes is clamped by a rectangular tube connector, and one of the side walls of the outermost U-shaped rectangular tube and the inner side wall of the head rectangular material are clamped by a rectangular tube connector;

[0008] The outer ring silencer structure includes four corner heads, four outer frame plates, an outer perforated plate connected to one side of the outer frame plate and a light plate connected to the other side of the outer frame plate. The four outer frame plates are connected end to end through four corner heads to form an outer ring. The two sides of each corner head are respectively clamped with one end of two adjacent outer frame plates. The inner side of the outer frame plate is provided with a card slot and a limiting protrusion that match the corner head. The inner side of the corner head is provided with a card block that matches the card slot, and the card block is provided with a limiting groove that matches the limiting protrusion.

[0009] The present invention designs the metamaterial silencer unit into a modular structure consisting of an outer ring silencer structure and an inner ring silencer structure, and the preparation process of each component is simple and novel, and all materials can be fully utilized during the preparation process; at the same time, the assembly between the various components is simple and reliable, and can be completed by simple assembly in actual use situations, without the need to be fully assembled before leaving the factory, so that the products leaving the factory are light and easy to carry, thereby reducing transportation costs.

[0010] Preferably, every two adjacent metamaterial sound-absorbing units are connected by a plurality of corner pieces and clamping bolts, and bolt holes matching the clamping bolts are provided on both sides of the corner pieces, and the bolt heads of the clamping bolts are clamped on the outer frame plates of the corresponding metamaterial sound-absorbing units, and the threaded sections of the clamping bolts are passed through the bolt holes and locked by locking nuts.

[0011] This structure ensures the convenience and reliability of assembling two adjacent metamaterial silencer units, and can also realize the combination of multiple metamaterial silencer devices, so that the metamaterial silencer device can be continuously lengthened and widened; only by slightly adjusting the connection angle of the corner piece and the clamping bolt, the connection angle of two adjacent metamaterial silencer units can be adjusted to realize vertical angle connection, horizontal connection and other connection methods.

[0012] Preferably, two lifting ears are provided on both sides of the above metamaterial sound-absorbing unit, each lifting ear is connected to a suspension rod, and each lifting ear is installed on the outer frame plate through a plurality of clamping bolts, and the rear ends of at least one pair of relatively arranged metamaterial sound-absorbing units are provided with clamping bolts for connecting the air duct.

[0013] On the one hand, this structure facilitates hoisting during overall installation, eliminating the bottom support cross bar required for the original hoisting; on the other hand, it facilitates the connection between the metamaterial silencer and the air duct (only the clamping bolts need to be connected to the connecting lugs on the air duct), eliminating the connection flange of the original metamaterial silencer.

[0014] Preferably, two symmetrical U-shaped clamps are provided on the inner side of the rectangular tube connector, a vertical partition bar is provided in the middle of the two U-shaped clamps, the width of each U-shaped clamp ring matches half the width of the U-shaped rectangular tube, and the distance between the vertical partition bar and the U-shaped clamp ring matches the side wall thickness of the U-shaped rectangular tube; the height of the rectangular tube connector is higher than the height of the U-shaped rectangular tube, and a reinforcement step is provided on the upper part of the rectangular tube connector, and the thickness of the reinforcement step is greater than the thickness of the U-shaped clamp ring.

[0015] This structure facilitates the connection of the U-shaped rectangular tubes and ensures the connection reliability of the U-shaped rectangular tubes; ensures the strength of the rectangular tube connectors and further ensures the connection reliability of the U-shaped rectangular tubes.

[0016] Preferably, the inner frame plate is provided with a connector mounting groove that matches the rectangular tube connector, and the depth of the connector mounting groove matches the thickness of the rectangular tube connector; the inner side of the head rectangular material is provided with a U-shaped groove that matches the U-shaped clamping ring, and the outer side of the head rectangular material is provided with a corner head connecting column for connecting the corner head, and the corner head connecting column has a threaded connecting hole.

[0017] This structure ensures the convenience and reliability of assembling the rectangular tube connector and the inner frame plate; ensures that the sealing of the head rectangular material is firm and reliable, and facilitates its connection with the corner.

[0018] Preferably, a clamping groove for installing a clamping bolt is provided on the outer side of the outer frame plate, and screw grooves for installing screws are provided on both sides of the clamping groove. The position of the clamping groove corresponds to the position of the limiting protrusion, and the depth of the clamping groove is greater than the depth of the screw groove; threaded holes matching the screw grooves are provided on both sides of the clamping block, and after the outer frame plate is clamped on the corner head, the fastening screws penetrate the screw grooves and are screwed into the threaded holes to further reinforce the outer frame plate and the corner head.

[0019] This structure allows the outer frame plate to be installed with slidable clamping bolts, facilitating the assembly between the outer frame plate and other components, and facilitating the installation of screws on the outer frame plate; further ensuring the assembly reliability between the outer frame plate and the corner.

[0020] Preferably, an inner ring assembly groove matching the inner ring is provided on the inner side of the block, and a limiting step is provided on the inner side of the inner ring assembly groove, wherein a countersunk hole is provided on the limiting groove on one side, and the position of the countersunk hole corresponds to the position of the limiting step. The countersunk screw passes through the countersunk hole and is screwed into the corresponding threaded hole on the inner ring to further reinforce the corner head and the inner ring; an arc chamfer and a bevel are provided on the outer side of the corner head, and a bevel groove is provided on the bevel, and the bevel is connected with the corresponding bevel on the outer frame plate to form a decorative bevel, and the bevel groove is connected with the corresponding bevel groove on the outer frame plate to form a decorative groove.

[0021] This structure can further ensure the assembly reliability between the corner and the inner ring; and ensure that the entire outer ring has good streamline and beautiful appearance.

[0022] Preferably, sealing materials are provided at the joints between the U-shaped rectangular tube and the rectangular tube connector, between the rectangular tube connector and the inner frame plate, between the head rectangular material and the rectangular tube connector, between the inner frame plate and the head rectangular material, and between the outer frame plate and the corner head, and the sealing material is one or more of nitrile rubber, polyurethane rubber, polypropylene rubber, silicone rubber, fluororubber, butyl rubber, ethylene propylene rubber, and chloroprene rubber.

[0023] This structure ensures its sealing effect and further ensures its sound-absorbing effect.

[0024] Preferably, the size of the upper and lower metamaterial sound-absorbing units is larger than that of the left and right metamaterial sound-absorbing units, and two metamaterial sound-absorbing units arranged back to back are provided between the middle parts of the upper and lower metamaterial sound-absorbing units, the size of the two middle metamaterial sound-absorbing units matches the size of the left and right metamaterial sound-absorbing units, and the lower middle side of the upper metamaterial sound-absorbing unit and the upper middle side of the lower metamaterial sound-absorbing unit are both provided with blocks with slide grooves that match the metamaterial sound-absorbing units, and the front ends of the two middle metamaterial sound-absorbing units are provided with wind guide wedges.

[0025] This structure makes it more suitable for use on wide-mouth air ducts, ensuring its supporting strength and sound-absorbing effect.

[0026] A preparation and assembly process of a composite metamaterial silencing device based on perforated plate and slit resonance sound absorption as claimed in claim 1, wherein the preparation process steps are as follows:

[0027] 1) The metamaterial silencing unit assembled into the metamaterial silencing device is designed into a modular structure;

[0028] 2) All components in each metamaterial silencing unit are formed in one process;

[0029] 3) cutting and polishing the components obtained in step 2) according to the size of the modular structure designed in step 1);

[0030] 4) The metamaterial silencing unit can be obtained by simply assembling the components obtained in step 3);

[0031] 5) randomly taking four metamaterial silencing units obtained in step 4) and performing simple assembly to obtain a metamaterial silencing device;

[0032] In step 1), the size of the metamaterial silencing unit designed into a modular structure is designed or adjusted according to the size of the installation site of the metamaterial silencing device;

[0033] The one-time processing and molding in step 2) mainly includes die casting or injection molding; the assembly of the metamaterial silencing unit in step 4) and the assembly of the metamaterial silencing device in step 5) are both performed manually;

[0034] The steps of the assembly process are as follows:

[0035] a) First, multiple U-shaped rectangular tubes are connected between two inner frame plates through rectangular tube connectors, and two ends of the two inner frame plates are sealed with two end-sealing rectangular materials to obtain an inner ring silencer structure, and sealing materials are installed at all joints of the inner ring silencer structure;

[0036] b) installing corner heads on the four corners of the inner ring noise reduction structure, then installing an outer frame plate between every two adjacent corner heads, and then installing a porous plate on one side of the four outer frame plates to form a complete metamaterial noise reduction unit, wherein the four outer frame plates and the porous plate constitute an outer ring noise reduction structure, and sealing materials are installed at all joints of the outer ring noise reduction structure;

[0037] c) four metamaterial silencing units are assembled end to end to form a complete composite metamaterial silencing device;

[0038] d) Use the hoisting equipment to lift the entire composite metamaterial silencing device through the lifting rod and the lifting lug, and then align it with the air duct and clamp it with the clamping bolts to complete the overall installation;

[0039] The size and quantity of the U-shaped rectangular tubes in step a) are selected according to the modular structure size of the ultrasonic material silencing unit;

[0040] The materials of the components in step a) and step b) are one or more of stainless steel profiles, aluminum alloy profiles, aluminum profiles, and hard plastic profiles;

[0041] In step a), the connections between the various components of the inner ring silencer structure are all made by snap-fitting, and in step b), the connections between the various components of the outer ring silencer structure are also made by snap-fitting.

[0042] The corner head is clamped with the inner ring sound-absorbing structure and then fastened with the rectangular head material by fastening screws. The outer frame plate is clamped on both sides of the outer ring of the corner head so that the outer ring end of the corner head is exposed to form the wrapping angle of the metamaterial sound-absorbing unit.

[0043] In step c), every two adjacent metamaterial silencer units are assembled and connected by three corner pieces and six clamping bolts. The bolt heads of the clamping bolts are clamped in the clamping grooves of the outer frame plate, and the threaded sections of the clamping bolts are passed through the bolt holes on one side of the corner pieces and are locked by locking nuts. The bolt heads of the clamping bolts can rotate in the clamping grooves so that the direction of the corner pieces can be adjusted, so that two adjacent metamaterial silencer units can be connected not only vertically but also horizontally. The vertical connection can form a composite metamaterial silencer device. If connected horizontally, multiple metamaterial silencer units can be spliced ​​to widen or lengthen the length or width of the composite metamaterial silencer device.

[0044] The present invention designs the metamaterial silencer unit into a modular structure consisting of an outer ring silencer structure and an inner ring silencer structure, and the preparation process of each component is simple and novel, and all materials can be fully utilized during the preparation process; at the same time, the assembly between the various components is simple and reliable, and can be completed by simple assembly in actual use situations, without the need to be fully assembled before leaving the factory, so that the products leaving the factory are light and easy to carry, thereby reducing transportation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the structure of the metamaterial silencing device of the present invention;

[0046] Figure 2 This is a schematic diagram of the structure of the metamaterial silencing unit of the present invention after the orifice plate is removed;

[0047] Figure 3 It is a schematic diagram of an explosion of the metamaterial silencing unit of the present invention;

[0048] Figure 4 It is an exploded schematic diagram of the inner ring noise reduction structure in the present invention;

[0049] Figure 5 It is a structural schematic diagram of the inner ring noise reduction structure in the present invention;

[0050] Figure 6 It is a schematic structural diagram of the rectangular tube connector in the present invention;

[0051] Figure 7 This is a schematic diagram of the structure of the rectangular head material in the present invention;

[0052] Figure 8 It is an explosion schematic diagram of the outer ring noise reduction structure in the present invention;

[0053] Fig. 9 It is a structural schematic diagram of the outer ring noise reduction structure in the present invention;

[0054] Fig.10 It is a structural schematic diagram of the corner head in the present invention;

[0055] Fig.11 It is a schematic diagram of the structure of the outer frame plate in the present invention;

[0056] Fig.12 This is a schematic diagram of the structure of the present invention after the suspension rod is removed;

[0057] Fig.13 It is a schematic diagram of the structure of the corner piece and the clamping bolt in the present invention;

[0058] In the figure, 1. metamaterial silencing unit, 2. U-shaped rectangular tube, 3. rectangular tube connector, 4. inner frame plate, 5. head rectangular material, 6. corner head, 7. outer perforated plate, 8. corner sheet, 9. clamping bolt, 10. lifting ear, 11. hanging rod, 12. outer frame plate, 13. clamping groove, 14. limiting protrusion, 15. clamping block, 16. limiting groove, 17. clamping slide groove, 18. screw groove, 19. screw Perforations, 20. Inner ring assembly groove, 21. Limiting step, 22. Countersunk hole, 23. Arc chamfer, 24. Decorative bevel, 25. U-shaped clamping ring, 26. Vertical spacer, 27. Reinforcement step, 28. Connector installation groove, 29. U-shaped clamping groove, 30. Corner head connecting column, 31. Threaded connection hole, 32. Block with slide groove, 33. Wind guide wedge, 34. Light plate, 35. Decorative groove. DETAILED DESCRIPTION

[0059] The present invention will be further described in detail below in conjunction with the accompanying drawings, but this does not limit the protection scope of the present invention.

[0060] like Figure 1-13 As shown, a composite metamaterial silencing device based on perforated plate and slit resonance sound absorption is formed by four metamaterial silencing units 1 connected in pairs to form an air flow channel inside. Each metamaterial silencing unit includes an outer ring silencing structure and an inner ring silencing structure that cooperate with each other. Every two adjacent metamaterial silencing units are connected by three corner pieces 8 and six clamping bolts 9. Bolt holes for matching clamping bolts 9 are provided on both sides of the corner pieces 8. The bolt heads of the clamping bolts 9 are clamped on the outer frame plate of the corresponding metamaterial silencing unit 1. Two lifting ears 10 are provided on both sides of the above metamaterial silencing unit, each of which is connected to a suspension rod 11, and each lifting ear 10 is installed on the outer frame plate through a number of clamping bolts. The rear ends of at least one pair of relatively arranged metamaterial silencing units are provided with clamping bolts for connecting air ducts. The size of the upper and lower metamaterial sound-absorbing units is larger than that of the left and right metamaterial sound-absorbing units, and two metamaterial sound-absorbing units arranged back to back are arranged between the middle parts of the upper and lower metamaterial sound-absorbing units, the size of the two middle metamaterial sound-absorbing units matches the size of the left and right metamaterial sound-absorbing units, and the middle lower side of the upper metamaterial sound-absorbing unit and the middle upper side of the lower metamaterial sound-absorbing unit are both provided with a block 32 with a slide groove that matches the metamaterial sound-absorbing unit, and the front ends of the two middle metamaterial sound-absorbing units are provided with a wind guide wedge 33.

[0061] The inner ring sound-absorbing structure includes a plurality of U-shaped rectangular tubes 2, a rectangular tube connector 3 connecting the plurality of U-shaped rectangular tubes 2, an inner frame plate 4 connecting the rectangular tube connector 3, a head rectangular material 5 sealing both ends of the inner frame plate 4, and an inner perforated plate connected to one side of the inner frame plate 4. One of the side walls of every two adjacent U-shaped rectangular tubes is clamped by a rectangular tube connector, and one of the side walls of the outermost U-shaped rectangular tube and the inner side wall of the head rectangular material 5 are clamped by a rectangular tube connector. Two mutually symmetrical U-shaped clamps 25 are provided on the inner side of the rectangular tube connector 3, and a vertical partition bar 26 is provided in the middle of the two U-shaped clamps. The width of each U-shaped clamp is matched with the width of half of the U-shaped rectangular tube 2, and the distance between the vertical partition bar 26 and the U-shaped clamp 25 is matched with the thickness of the side wall of the U-shaped rectangular tube 2. The height of the rectangular tube connector 3 is higher than that of the U-shaped rectangular tube 2, and a reinforcement step 27 is provided on the upper part of the rectangular tube connector 3, and the thickness of the reinforcement step 27 is greater than the thickness of the U-shaped clamping ring 25. The inner frame plate 4 is provided with a connector installation groove 28 that matches the rectangular tube connector 3, and the depth of the connector installation groove 28 matches the thickness of the rectangular tube connector 4. The inner side of the head rectangular material 5 is provided with a U-shaped clamping groove 29 that matches the U-shaped clamping ring 25, and the outer side of the head rectangular material 5 is provided with a corner head connection column 30 for connecting the corner head, and the corner head connection column 30 has a threaded connection hole 31.

[0062] The outer ring muffler structure includes four corner heads 6, four outer frame plates 12, an outer perforated plate 7 connected to one side of the outer frame plate, and a light plate 34 connected to the other side of the outer frame plate. The four outer frame plates are connected end to end through the four corner heads to form an outer ring. The two sides of each corner head are respectively clamped with one end of two adjacent outer frame plates. The inner side of the outer frame plate is provided with a clamping groove 13 and a limiting protrusion 14 that match the corner head 6. The inner side of the corner head 6 is provided with a clamping block 15 that matches the clamping groove 13. The clamping block 15 is provided with a limiting groove 16 that matches the limiting protrusion 14. The outer side of the outer frame plate 12 is provided with a clamping groove 17 for installing the clamping bolt 9. The two sides of the clamping groove 17 are provided with screw grooves 18 for installing screws. The position of the clamping groove 17 corresponds to the position of the limiting protrusion 14. The depth of the clamping groove 17 is greater than the depth of the screw groove 18. The two sides of the block 15 are provided with threaded holes 19 that match the screw grooves 18. After the outer frame plate 12 is clamped on the corner head 6, the fastening screws penetrate the screw grooves 18 and are screwed into the threaded holes 19 to further reinforce the outer frame plate 12 and the corner head 6. The inner side of the block 15 is provided with an inner ring assembly groove 20 that matches the inner ring. The inner side of the inner ring assembly groove 20 is provided with a limiting step 21. The limiting groove 16 on one side is provided with a countersunk hole 22. The position of the countersunk hole 22 corresponds to the position of the limiting step 21. The countersunk screw passes through the countersunk hole 22 and is screwed into the corresponding threaded hole on the inner ring to further reinforce the corner head 6 and the inner ring. The outer side of the corner head 6 is provided with an arc chamfer 23 and a bevel. The bevel is provided with a bevel groove. The bevel is connected with the corresponding bevel on the outer frame plate 12 to form a decorative bevel 24. The bevel groove is connected with the bevel groove on the corresponding part of the outer frame plate 12 to form a decorative groove 35.

[0063] Sealing materials are provided at the joints between the U-shaped rectangular tube 2 and the rectangular tube connector 3, between the rectangular tube connector 3 and the inner frame plate 4, between the head rectangular material 5 and the rectangular tube connector 3, between the inner frame plate 4 and the head rectangular material 5, and between the outer frame plate 12 and the corner head 6. The sealing materials are one or more of nitrile rubber, polyurethane rubber, polypropylene rubber, silicone rubber, fluororubber, butyl rubber, ethylene propylene rubber, and chloroprene rubber.

[0064] The efficient and convenient preparation process of the composite metamaterial silencing device is as follows:

[0065] 1) The metamaterial silencing unit assembled into the metamaterial silencing device is designed into a modular structure;

[0066] 2) All components in each metamaterial silencing unit are formed in one process;

[0067] 3) cutting and polishing the components obtained in step 2) according to the size of the modular structure designed in step 1);

[0068] 4) The metamaterial silencing unit can be obtained by simply assembling the components obtained in step 3);

[0069] 5) Take any four metamaterial silencing units obtained in step 4) and simply assemble them to obtain a metamaterial silencing device.

[0070] In step 1), the size of the metamaterial silencing unit designed into a modular structure is designed or adjusted according to the size of the installation site of the metamaterial silencing device.

[0071] The one-time processing and molding in step 2) mainly includes die casting or injection molding; the assembly of the metamaterial silencing unit in step 4) and the assembly of the metamaterial silencing device in step 5) are both performed manually.

[0072] The efficient and convenient assembly process of the composite metamaterial silencing device has the following specific steps: first assemble the inner ring silencing structure of the metamaterial silencing unit, then install the outer ring silencing structure on the inner ring silencing structure, and install sealing materials at all joints between the inner ring silencing structure and the outer ring silencing structure; finally, assemble the four metamaterial silencing units end to end to obtain a complete circle of composite metamaterial silencing device. The specific steps are as follows:

[0073] a) First, multiple U-shaped rectangular tubes 2 are connected between two inner frame plates 4 through rectangular tube connectors 3, and two ends of the two inner frame plates 4 are sealed with two end-sealing rectangular materials 5 to obtain an inner ring sound-absorbing structure, and sealing materials are installed at all joints of the inner ring sound-absorbing structure;

[0074] b) installing corner heads 6 at the four corners of the inner ring sound-absorbing structure, and then installing an outer frame plate 12 between every two adjacent corner heads 6, and then installing a porous plate on one side of the four outer frame plates 12 to form a complete metamaterial sound-absorbing unit 1, wherein the four outer frame plates and the porous plate constitute an outer ring sound-absorbing structure, and sealing materials are installed at all joints of the outer ring sound-absorbing structure;

[0075] c) four metamaterial silencing units are assembled end to end to form a complete composite metamaterial silencing device;

[0076] d) Use lifting equipment to lift the entire composite metamaterial silencer through the lifting rod and the lifting lug, and then align it with the air duct and clamp it with the clamping bolts to complete the overall installation.

[0077] The size and quantity of the U-shaped rectangular tubes in step a) are selected according to the modular structure size of the ultrasonic material silencing unit.

[0078] The materials of the components in step a) and step b) are one or more of stainless steel profiles, aluminum alloy profiles, aluminum profiles, and hard plastic profiles, and the sealing materials in step a) and step b) are one or more of nitrile rubber, polyurethane rubber, polypropylene rubber, silicone rubber, fluororubber, butyl rubber, ethylene propylene rubber, and chloroprene rubber.

[0079] In step a), the connections between the various components of the inner ring silencer structure are all made by snap-fitting, and in step b), the connections between the various components of the outer ring silencer structure are also made by snap-fitting.

[0080] The corner head is clamped with the inner ring silencer structure and then fastened to the rectangular head member by fastening screws. The outer frame plate is clamped on both sides of the outer ring of the corner head so that the outer ring end of the corner head is exposed to form the wrap angle of the metamaterial silencer unit.

[0081] In step c), every two adjacent metamaterial silencer units are assembled and connected by three corner pieces and six clamping bolts. The bolt heads of the clamping bolts are clamped in the clamping grooves of the outer frame plate, and the threaded sections of the clamping bolts are passed through the bolt holes on one side of the corner pieces and are locked by locking nuts. The bolt heads of the clamping bolts can rotate in the clamping grooves so that the direction of the corner pieces can be adjusted, so that two adjacent metamaterial silencer units can be connected not only vertically but also horizontally. The vertical connection can form a composite metamaterial silencer device. If connected horizontally, multiple metamaterial silencer units can be spliced ​​to widen or lengthen the length or width of the composite metamaterial silencer device.

[0082] The present invention designs the metamaterial silencer unit into a modular structure consisting of an outer ring silencer structure and an inner ring silencer structure, and the preparation process of each component is simple and novel, and all materials can be fully utilized during the preparation process; at the same time, the assembly between the various components is simple and reliable, and can be completed by simple assembly in actual use situations, without the need to be fully assembled before leaving the factory, so that the products leaving the factory are light and easy to carry, thereby reducing transportation costs.

Claims

1. A composite metamaterial silencing device based on perforated plate and slit resonance sound absorption, Features: It is formed by four metamaterial silencing units connected in pairs, forming an airflow channel inside, each metamaterial silencing unit includes an outer ring silencing structure and an inner ring silencing structure that cooperate with each other, the inner ring silencing structure includes a plurality of U-shaped rectangular tubes, a rectangular tube connector connecting the plurality of U-shaped rectangular tubes, an inner frame plate connecting the rectangular tube connectors, a head rectangular material sealing both ends of the inner frame plate, and an inner perforated plate connected to one side of the inner frame plate, one of the side walls of every two adjacent U-shaped rectangular tubes is clamped by a rectangular tube connector, and one of the side walls of the outermost U-shaped rectangular tube and the inner side wall of the head rectangular material are clamped by a rectangular tube connector; Two mutually symmetrical U-shaped collars are arranged on the inner side of the rectangular tube connector, a vertical spacer is arranged in the middle of the two U-shaped collars, the width of each U-shaped collar matches the width of half the U-shaped rectangular tube, and the distance between the vertical spacer and the U-shaped collar matches the thickness of the side wall of the U-shaped rectangular tube; the height of the rectangular tube connector is higher than the height of the U-shaped rectangular tube, and a reinforcement step is arranged on the upper part of the rectangular tube connector, and the thickness of the reinforcement step is greater than the thickness of the U-shaped collar; The outer ring silencer structure includes four corner heads, four outer frame plates, an outer perforated plate connected to one side of the outer frame plate and a light plate connected to the other side of the outer frame plate. The four outer frame plates are connected end to end through four corner heads to form an outer ring. The two sides of each corner head are respectively clamped with one end of two adjacent outer frame plates. The inner side of the outer frame plate is provided with a card slot and a limiting protrusion that match the corner head. The inner side of the corner head is provided with a card block that matches the card slot, and the card block is provided with a limiting groove that matches the limiting protrusion.

2. A composite metamaterial silencing device based on perforated plate and slit resonance sound absorption according to claim 1, Features: Every two adjacent metamaterial sound-absorbing units are connected by a number of corner pieces and clamping bolts. Bolt holes matching the clamping bolts are provided on both sides of the corner pieces. The bolt heads of the clamping bolts are clamped on the outer frame plates of the corresponding metamaterial sound-absorbing units. The threaded sections of the clamping bolts pass through the bolt holes and are locked by locking nuts.

3. A composite metamaterial silencing device based on perforated plate and slit resonance sound absorption according to claim 2, Features: Two lifting ears are provided on both sides of the above metamaterial silencer unit, each lifting ear is connected to a suspension rod, and each lifting ear is installed on the outer frame plate through a plurality of clamping bolts, and the rear ends of at least one pair of relatively arranged metamaterial silencer units are provided with clamping bolts for connecting the air duct.

4. A composite metamaterial silencing device based on perforated plate and slit resonance sound absorption according to claim 1, Features: The inner frame plate is provided with a connector installation groove that matches the rectangular tube connector, and the depth of the connector installation groove matches the thickness of the rectangular tube connector; the inner side of the head rectangular material is provided with a U-shaped groove that matches the U-shaped clamping ring, and the outer side of the head rectangular material is provided with a corner head connecting column for connecting the corner head, and the corner head connecting column has a threaded connection hole.

5. A composite metamaterial silencing device based on perforated plate and slit resonance sound absorption according to claim 2, Features: The outer side of the outer frame plate is provided with a clamping groove for installing a clamping bolt, and screw grooves for installing screws are provided on both sides of the clamping groove. The position of the clamping groove corresponds to the position of the limiting protrusion, and the depth of the clamping groove is greater than the depth of the screw groove; threaded holes matching the screw grooves are provided on both sides of the clamping block. After the outer frame plate is clamped on the corner head, the fastening screws penetrate the screw grooves and are screwed into the threaded holes to further reinforce the outer frame plate and the corner head.

6. A composite metamaterial silencing device based on perforated plate and slit resonance sound absorption according to claim 1, Features: An inner ring assembly groove matching the inner ring is provided on the inner side of the clamping block, and a limiting step is provided on the inner side of the inner ring assembly groove, wherein a countersunk hole is provided on the limiting groove on one side, and the position of the countersunk hole corresponds to the position of the limiting step. The countersunk screw passes through the countersunk hole and is screwed into the corresponding threaded hole on the inner ring to further reinforce the corner head and the inner ring; an arc chamfer and a bevel are provided on the outer side of the corner head, and a bevel groove is provided on the bevel, and a decorative bevel is formed when the bevel is connected with the corresponding bevel on the outer frame plate, and a decorative groove is formed when the bevel groove is connected with the corresponding bevel groove on the outer frame plate.

7. A composite metamaterial silencing device based on perforated plate and slit resonance sound absorption according to claim 1, Features: Sealing materials are provided at the joints between the U-shaped rectangular tube and the rectangular tube connector, between the rectangular tube connector and the inner frame plate, between the head rectangular material and the rectangular tube connector, between the inner frame plate and the head rectangular material, and between the outer frame plate and the corner head. The sealing material is one or more of nitrile rubber, polyurethane rubber, polypropylene rubber, silicone rubber, fluororubber, butyl rubber, ethylene propylene rubber, and chloroprene rubber.

8. A composite metamaterial silencing device based on perforated plate and slit resonance sound absorption according to claim 1, Features: The size of the upper and lower metamaterial sound-absorbing units is larger than that of the left and right metamaterial sound-absorbing units, and two metamaterial sound-absorbing units arranged back to back are arranged between the middle parts of the upper and lower metamaterial sound-absorbing units, the size of the two middle metamaterial sound-absorbing units matches the size of the left and right metamaterial sound-absorbing units, and the middle lower side of the upper metamaterial sound-absorbing unit and the middle upper side of the lower metamaterial sound-absorbing unit are both provided with blocks with slide grooves that match the metamaterial sound-absorbing units, and the front ends of the two middle metamaterial sound-absorbing units are provided with wind guide wedges.

9. A preparation and assembly process of a composite metamaterial silencing device based on perforated plate and slit resonance sound absorption as claimed in claim 1, Features: The preparation process steps are as follows: 1) The metamaterial silencing unit assembled into the metamaterial silencing device is designed into a modular structure; 2) All components in each metamaterial silencing unit are formed in one process; 3) cutting and polishing the components obtained in step 2) according to the size of the modular structure designed in step 1); 4) The metamaterial silencing unit can be obtained by simply assembling the components obtained in step 3); 5) randomly taking four metamaterial silencing units obtained in step 4) and performing simple assembly to obtain a metamaterial silencing device; In step 1), the size of the metamaterial silencing unit designed into a modular structure is designed or adjusted according to the size of the installation site of the metamaterial silencing device; The one-time processing and molding in step 2) mainly includes die casting or injection molding; the assembly of the metamaterial silencing unit in step 4) and the assembly of the metamaterial silencing device in step 5) are both performed manually; The steps of the assembly process are as follows: a) First, multiple U-shaped rectangular tubes are connected between two inner frame plates through rectangular tube connectors, and two ends of the two inner frame plates are sealed with two end-sealing rectangular materials to obtain an inner ring silencer structure, and sealing materials are installed at all joints of the inner ring silencer structure; b) installing corner heads on the four corners of the inner ring noise reduction structure, then installing an outer frame plate between every two adjacent corner heads, and then installing a porous plate on one side of the four outer frame plates to form a complete metamaterial noise reduction unit, wherein the four outer frame plates and the porous plate constitute an outer ring noise reduction structure, and sealing materials are installed at all joints of the outer ring noise reduction structure; c) four metamaterial silencing units are assembled end to end to form a complete composite metamaterial silencing device; d) Use the hoisting equipment to lift the entire composite metamaterial silencing device through the lifting rod and the lifting lug, and then align it with the air duct and clamp it with the clamping bolts to complete the overall installation; The size and quantity of the U-shaped rectangular tubes in step a) are selected according to the modular structure size of the ultrasonic material silencing unit; The materials of the components in step a) and step b) are one or more of stainless steel profiles, aluminum alloy profiles, aluminum profiles, and hard plastic profiles; In step a), the connections between the various components of the inner ring muffler structure are all made by snap-fitting, and in step b), the connections between the various components of the outer ring muffler structure are also made by snap-fitting; The corner head is clamped with the inner ring sound-absorbing structure and then fastened with the rectangular head material by fastening screws. The outer frame plate is clamped on both sides of the outer ring of the corner head so that the outer ring end of the corner head is exposed to form the wrapping angle of the metamaterial sound-absorbing unit. In step c), every two adjacent metamaterial silencer units are assembled and connected by three corner pieces and six clamping bolts. The bolt heads of the clamping bolts are clamped in the clamping grooves of the outer frame plate, and the threaded sections of the clamping bolts are passed through the bolt holes on one side of the corner pieces and are locked by locking nuts. The bolt heads of the clamping bolts can rotate in the clamping grooves so that the direction of the corner pieces can be adjusted, so that two adjacent metamaterial silencer units can be connected not only vertically but also horizontally. The vertical connection can form a composite metamaterial silencer device. If connected horizontally, multiple metamaterial silencer units can be spliced ​​to widen or lengthen the length or width of the composite metamaterial silencer device.

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