Sound-absorbing and heat-insulating structure, internal unit of wind cabinet and air supply duct

Abstract

The utility model discloses a sound-absorbing and heat-insulating structure, an inner unit of a wind cabinet, and an air supply duct. The sound-absorbing and heat-insulating structure comprises a low-frequency noise reduction layer group and a high-frequency noise reduction layer group. The low-frequency noise reduction layer group is located on the side of the high-frequency noise reduction layer group close to the noise source, and the surface of the low-frequency noise reduction layer group close to the noise source has a plurality of noise reduction holes. The low-frequency noise reduction layer group has a large number of tiny interconnected pores inside, and has a plurality of noise reduction holes on the surface close to the noise source. Sound waves can penetrate into the structure along the plurality of noise reduction holes, and undergo friction with the structure to convert sound energy into heat energy. The low-frequency noise reduction layer group and the high-frequency noise reduction layer group cooperate with each other and play a role in turn. On the basis of taking into account the sound-absorbing, the design needs of heat preservation are taken into account, and the sound waves during airflow delivery are silenced to a greater extent, especially for low-frequency noise with a frequency lower than 400Hz, and the noise reduction effect in the process of large air volume delivery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of composite boards, in particular to a sound-absorbing and heat-insulating structure, an air cabinet inner unit and an air supply duct. Background Art

[0002] At present, air duct systems are increasingly used in daily engineering applications, and users are also paying more attention to indoor noise. How to deal with the hidden noise generated by large air volume during the delivery process, especially the low-frequency wind noise that is easily ignored, has put forward higher requirements for noise reduction structures and materials. At present, the materials used in the air duct walls of most products or engineering designs on the market have poor silencing effects on low-frequency noise. Utility Model Content

[0003] The embodiments of the utility model provide a sound-absorbing and heat-insulating structure, an inner unit of an air cabinet and an air supply duct, which solve the problem of poor sound-absorbing performance of low-frequency noise during the transportation of large air volumes.

[0004] In a first aspect, an embodiment of the utility model provides a sound-absorbing and heat-insulating structure, comprising a low-frequency noise reduction layer group and a high-frequency noise reduction layer group, wherein the low-frequency noise reduction layer group is located on the side of the high-frequency noise reduction layer group close to the noise source, and the surface of the low-frequency noise reduction layer group close to the noise source has multiple noise reduction holes.

[0005] According to the sound-absorbing and heat-insulating structure of the embodiment of the utility model, it includes a low-frequency noise reduction layer group and a high-frequency noise reduction layer group, wherein the low-frequency noise reduction layer group is located on the side of the high-frequency noise reduction layer group close to the noise source, and the surface of the low-frequency noise reduction layer group close to the noise source has a plurality of noise reduction holes. The low-frequency noise reduction layer group has a large number of tiny interconnected pores inside, and has a plurality of noise reduction holes on the surface close to the noise source. Sound waves can penetrate into the structure along the plurality of noise reduction holes, and the friction with the structure converts the sound energy into heat energy, thereby causing the sound wave attenuation, playing the role of low-frequency noise reduction and silencing; the high-frequency noise reduction layer group includes a high-density material, which can play the dual role of isolating high-frequency sound and heat preservation. Through the mutual cooperation of the low-frequency noise reduction layer group and the high-frequency noise reduction layer group, they play their roles in turn, and on the basis of taking into account the sound elimination, the design requirements of heat preservation are taken into account, and the sound waves during airflow transportation are silenced to a greater extent, especially for low-frequency noise with a frequency below 400Hz, and the noise reduction effect in the process of large air volume transportation is improved.

[0006] According to the aforementioned implementation of the first aspect of the utility model, the low-frequency noise reduction layer group includes a first sheet metal layer, a non-woven fabric layer and a polyester fiber layer arranged in sequence from the side close to the noise source toward the high-frequency noise reduction layer group, and the multiple noise reduction holes include a plurality of through holes arranged in the first sheet metal layer; the high-frequency noise reduction layer group includes a second sheet metal layer and a foaming layer located on the side of the second sheet metal layer close to the low-frequency noise reduction layer group.

[0007] According to any of the aforementioned implementations of the first aspect of the utility model, the thickness of the first sheet metal layer is less than the thickness of the second sheet metal layer.

[0008] According to any of the aforementioned embodiments of the first aspect of the utility model, the hole spacing of the plurality of through holes is 1.2 to 2 times of the hole diameter; the hole diameter of each through hole is 1 to 5 mm. The hole spacing is determined by the hole diameter of the through hole, and sound waves of different frequencies are absorbed to meet the silencing requirements of different environments.

[0009] According to any of the aforementioned embodiments of the first aspect of the utility model, the foaming layer includes a rubber-plastic foaming layer or an extruded polystyrene foam plastic layer. Since the foaming layer has pores inside, it can block noise for a second time and has a heat preservation effect, thereby achieving the dual effects of heat preservation and noise reduction.

[0010] According to any of the above embodiments of the first aspect of the utility model, the non-woven fabric layer is a polylactic acid layer, and the weight of the non-woven fabric layer per square meter is 20 to 100 g. Since the polylactic acid layer itself has good mechanical properties and tiny pores, when sound waves enter the polylactic acid layer, it is beneficial to improve the effect of silencing low-frequency noise.

[0011] According to any of the above embodiments of the first aspect of the utility model, the density of the polyester fiber layer is 120 to 200 kg / m 3 Since the polyester fiber layer has a porous structure, it has a good effect on high-frequency sound insulation.

[0012] According to any of the aforementioned embodiments of the first aspect of the utility model, the total thickness of the sound-absorbing and heat-insulating structure is 30 to 50 mm; the thickness of the first sheet metal layer is 0.5 to 1.2 mm, the thickness of the foaming layer is 10 to 25 mm, the thickness of the polyester fiber layer is 10 to 25 mm, and the thickness of the second sheet metal layer is 0.8 to 2 mm.

[0013] In a second aspect, an embodiment of the utility model provides an indoor unit of a wind cabinet, comprising a sound-absorbing and heat-insulating structure according to any of the aforementioned embodiments of the first aspect of the utility model.

[0014] In a third aspect, an embodiment of the utility model provides an air supply duct, comprising a sound-absorbing and heat-insulating structure according to any of the aforementioned embodiments of the first aspect of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with the embodiments with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the disassembly of an embodiment of the sound-absorbing and heat-insulating structure of the utility model;

[0018] Figure 2 It is a three-dimensional schematic diagram of the first sheet metal layer in an embodiment of the sound-absorbing and heat-insulating structure of the utility model;

[0019] Figure 3 It is a schematic front view of the first sheet metal layer in an embodiment of the sound-absorbing and heat-insulating structure of the utility model;

[0020] Figure 4 for Figure 3 A partial enlarged schematic diagram of area A in the middle.

[0021] Description of reference numerals:

[0022] 100-low frequency noise reduction layer group; 110-first sheet metal layer; 111-through hole; 120-non-woven fabric layer; 130-polyester fiber layer;

[0023] 200-high frequency noise reduction layer group; 210-second sheet metal layer; 220-foaming layer. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0027] The embodiment of the utility model provides a sound-absorbing and heat-insulating structure, which can be used in an air cabinet internal unit or an air supply duct to solve the problem of poor sound-absorbing performance of low-frequency noise during the transportation of large air volumes.

[0028] like Figure 1 As shown, the sound-absorbing and heat-insulating structure of this embodiment includes a low-frequency noise reduction layer group 100 and a high-frequency noise reduction layer group 200. The low-frequency noise reduction layer group 100 is located on the side of the high-frequency noise reduction layer group 200 close to the noise source, and the surface of the low-frequency noise reduction layer group 100 close to the noise source has multiple noise reduction holes.

[0029] According to the sound-absorbing and heat-insulating structure of the embodiment of the utility model, it includes a low-frequency noise reduction layer group 100 and a high-frequency noise reduction layer group 200. The low-frequency noise reduction layer group 100 is located on the side of the high-frequency noise reduction layer group 200 close to the noise source, and the surface of the low-frequency noise reduction layer group 100 close to the noise source has multiple noise reduction holes. There are a large number of tiny interconnected pores inside the low-frequency noise reduction layer group 100, and a plurality of noise reduction holes are provided on the surface close to the noise source. Sound waves can penetrate into the structure along the plurality of noise reduction holes, and convert sound energy into heat energy by friction with the structure, thereby causing sound wave attenuation, and playing a role in low-frequency noise reduction and silencing; the high-frequency noise reduction layer group 200 includes high-density materials, which can play a dual role of isolating high-frequency sounds and heat preservation. The low-frequency noise reduction layer group 100 and the high-frequency noise reduction layer group 200 cooperate with each other and play their roles in turn. On the basis of taking into account the sound insulation, the design needs of heat preservation are taken into account, and the sound waves during airflow transportation are silenced to a greater extent, especially for low-frequency noise with a frequency below 400Hz, which improves the noise reduction effect during large air volume transportation.

[0030] like Figures 2 to 4As shown, in some embodiments, the low-frequency noise reduction layer group 100 includes a first sheet metal layer 110, a non-woven fabric layer 120 and a polyester fiber layer 130 which are arranged in sequence from the side close to the noise source to the high-frequency noise reduction layer group 200, and the multiple noise reduction holes include a plurality of through holes 111 arranged in the first sheet metal layer 110; the high-frequency noise reduction layer group 200 includes a second sheet metal layer 210 and a foaming layer 220 located on the side of the second sheet metal layer 210 close to the low-frequency noise reduction layer group 100, wherein the foaming layer 220 has pores inside. The noise reduction holes also include pores in the non-woven fabric layer 120 and the polyester fiber layer 130. When the sound waves penetrate into the structure along the multiple through holes 111 of the first sheet metal layer 110, the pores in the non-woven fabric layer 120 and the polyester fiber layer 130 are connected with the multiple through holes 111 of the first sheet metal layer 110, and these large number of tiny connected pores of the low-frequency noise reduction layer group 100 are connected with the pores of the foaming layer 220 of the high-frequency noise reduction layer group 200. The sound waves enter the high-frequency noise reduction layer group 200 from the low-frequency noise reduction layer group 100 in turn, and rub against the structure to convert sound energy into heat energy, thereby causing sound wave attenuation, which has the advantage of better noise reduction performance.

[0031] In the above embodiment, the through hole 111 is a circular hole. In some other embodiments, the through hole 111 may also be a hole of other shapes such as a polygonal hole or an elliptical hole.

[0032] In some embodiments, the thickness of the first sheet metal layer 110 is less than the thickness of the second sheet metal layer 210. Since the second sheet metal layer 210 is a high-density material and is the side away from the noise source, a certain thickness setting can more effectively block high-frequency sounds and keep warm, and ensure the structural strength of the sound-absorbing and heat-insulating structure.

[0033] In some embodiments, the edges of the first sheet metal layer 110 and the second sheet metal layer 210 are respectively provided with side walls, and the side walls of the first sheet metal layer 110 and the second sheet metal layer 210 are correspondingly connected to form a box structure, wherein the non-woven fabric layer 120, the polyester fiber layer 130, and the foam layer 220 are sandwiched in the box structure.

[0034] In some embodiments, the first sheet metal layer 110 and the second sheet metal layer 210 are fixedly connected. In some embodiments, the first sheet metal layer 110 and the second sheet metal layer 210 are detachably connected. The detachable connection method can be a bolt connection or a rivet connection.

[0035] In some embodiments, the hole pitch of the plurality of through holes 111 is 1.2 to 2 times the hole diameter; the hole diameter of each through hole 111 is 1 to 5 mm. For example, the hole diameter of the through hole 111 is 1 mm, 2 mm, or 5 mm. The hole pitch is determined by the hole diameter of the through hole 111 to absorb sound waves of different frequencies to meet the silencing requirements of different environments.

[0036] In some embodiments, the foam layer 220 includes a rubber foam layer or an extruded polystyrene foam layer.

[0037] The rubber-plastic foam layer 220 is a rubber-plastic sponge. Since the rubber-plastic sponge is an elastic foam material, it has the characteristics of heat preservation, flame retardancy, shock absorption and noise reduction. Therefore, when the sound wave enters the second sheet metal layer 210 from the air, the noise reduction effect is reduced. When the noise passes through the foam layer 220, since the foam layer 220 has pores inside, it can block the noise for a second time and has a heat preservation effect, thereby achieving the dual effects of heat preservation and noise reduction.

[0038] The extruded polystyrene foam plastic (Extruded Polystyrene Board, XPS) layer is a foam board. Since it has low thermal conductivity and a tight honeycomb structure, it can more effectively prevent heat conduction and is very suitable as the foaming layer 220 for the air duct wall.

[0039] In some embodiments, the non-woven fabric layer 120 is a polylactic acid layer, and the weight of each square meter of the non-woven fabric layer 120 is 20 to 100 grams. Since the polylactic acid (PLA) layer itself has good mechanical properties, it can play a role of not being easily deformed, and the non-woven fabric layer 120 has tiny pores, when sound waves enter the polylactic acid layer, it is beneficial to improve the effect of silencing low-frequency noise.

[0040] In some embodiments, the density of the polyester fiber layer 130 is 120 to 200 kg / m3. Since the polyester fiber layer 130 is a porous structure, it has a good effect on high-frequency sound insulation. When facing the air duct wall, sound waves enter the polyester fiber layer 130 from the air in sequence. Since the first sheet metal layer 110, the non-woven fabric layer 120, the polyester fiber layer 130 and the foaming layer 220 all have porous pores, the sound waves are attenuated when passing through different media, which can achieve the effect of layer-by-layer sound insulation.

[0041] In some embodiments, the total thickness of the sound-absorbing and heat-insulating structure is 30 to 50 mm. For example, the total thickness of the sound-absorbing and heat-insulating structure is 30 mm, 40 mm, or 50 mm. Herein, the total thickness of the sound-absorbing and heat-insulating structure refers to the distance from the surface of the first sheet metal layer 110 close to the noise source to the surface of the second sheet metal layer 210 away from the noise source.

[0042] In some embodiments, the thickness of the first sheet metal layer 110 is 0.5 to 1.2 mm. For example, the thickness of the first sheet metal layer 110 is 0.5 mm, 0.8 mm, or 1.2 mm.

[0043] In some embodiments, the thickness of the foaming layer 220 is 10 to 25 mm. For example, the thickness of the foaming layer 220 is 10 mm, 15 mm, or 25 mm.

[0044] In some embodiments, the thickness of the polyester fiber layer 130 is 10 to 25 mm. For example, the thickness of the polyester fiber layer 130 is 10 mm, 15 mm, or 25 mm.

[0045] In some embodiments, the thickness of the second sheet metal layer 210 is 0.8 to 2 mm. For example, the thickness of the second sheet metal layer 210 is 0.8 mm, 1 mm, or 2 mm.

[0046] The sound-absorbing and heat-insulating structure of the embodiment of the utility model has a 30% lower wind resistance on the windward surface after special parameter design and array arrangement than the windward surface wind resistance of the sound-absorbing structure made of foamed polypropylene material, and the service life of the inner windward surface is long without the hidden danger of aging and impurities.

[0047] The embodiment of the utility model also provides an indoor unit in a wind cabinet. The indoor unit in a wind cabinet includes the sound-absorbing and heat-insulating structure of any of the aforementioned embodiments of the utility model. The sound-absorbing and heat-insulating structure includes a low-frequency noise reduction layer group 100 and a high-frequency noise reduction layer group 200. The low-frequency noise reduction layer group 100 is located on the side of the high-frequency noise reduction layer group 200 close to the noise source, and the surface of the low-frequency noise reduction layer group 100 close to the noise source has a plurality of noise reduction holes. There are a large number of tiny interconnected pores inside the low-frequency noise reduction layer group 100, and a plurality of noise reduction holes are provided on the surface close to the noise source. Sound waves can penetrate into the structure along the plurality of noise reduction holes, and convert sound energy into heat energy by friction with the structure, thereby causing sound wave attenuation, and playing a role in low-frequency noise reduction and silencing; the high-frequency noise reduction layer group 200 is a high-density material, which can play a dual role of isolating high-frequency sounds and heat preservation. The low-frequency noise reduction layer group 100 and the high-frequency noise reduction layer group 200 cooperate with each other and play their roles in turn. On the basis of taking into account the sound insulation, the design needs of heat preservation are taken into account, and the sound waves during airflow transportation are silenced to a greater extent, especially for low-frequency noise with a frequency below 400Hz, which improves the noise reduction effect during large air volume transportation.

[0048] The embodiment of the utility model further provides an air supply duct. The air supply duct includes the sound-absorbing and heat-insulating structure of any of the aforementioned embodiments of the utility model. The sound-absorbing and heat-insulating structure includes a low-frequency noise reduction layer group 100 and a high-frequency noise reduction layer group 200. The low-frequency noise reduction layer group 100 is located on the side of the high-frequency noise reduction layer group 200 close to the noise source, and the surface of the low-frequency noise reduction layer group 100 close to the noise source has a plurality of noise reduction holes. There are a large number of tiny interconnected pores inside the low-frequency noise reduction layer group 100, and a plurality of noise reduction holes are provided on the surface close to the noise source. Sound waves can penetrate into the structure along the plurality of noise reduction holes, and convert sound energy into heat energy by friction with the structure, thereby causing sound wave attenuation, and playing a role in low-frequency noise reduction and silencing; the high-frequency noise reduction layer group 200 is a high-density material, which can play a dual role of isolating high-frequency sounds and heat preservation. The low-frequency noise reduction layer group 100 and the high-frequency noise reduction layer group 200 cooperate with each other and play their roles in turn. On the basis of taking into account the sound insulation, the design needs of heat preservation are taken into account, and the sound waves during airflow transportation are silenced to a greater extent, especially for low-frequency noise with a frequency below 400Hz, which improves the noise reduction effect during large air volume transportation.

[0049] When the sound-absorbing and heat-insulating structure of the utility model is in use, through the setting of multiple noise-absorbing holes of the low-frequency noise-absorbing layer group 100 and the pore setting of the foam layer 220 of the high-frequency noise-absorbing layer group 200, when the sound waves sequentially pass through the low-frequency noise-absorbing layer group 100 and enter the high-frequency noise-absorbing layer group 200, resonance will be formed in the air, and the friction of the air in the micropores will be strengthened, so that the sound energy of the noise is converted into heat energy and dissipated, which can effectively block the noise. Among them, through the pores on the non-woven fabric layer 120, the polyester fiber layer 130 and the foam layer 220, the noise can be blocked and silenced for a second time, especially for the effect of low-frequency silencing. Then, the second sheet metal layer 210 on the side away from the noise source cooperates with the foam layer 220 to play the dual role of isolating high-frequency sound and heat preservation. According to the multi-layer composite structure of this embodiment, on the basis of considering the sound insulation and thermal insulation design, other design requirements such as the service life of the air supply duct are taken into account. Therefore, the problem of poor low-frequency sound insulation performance and inability to effectively block noise in the existing large air volume delivery process, which affects the daily living environment, can be effectively solved.

[0050] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A sound-absorbing and heat-insulating structure, characterized in that: It comprises a low-frequency noise reduction layer group and a high-frequency noise reduction layer group. The low-frequency noise reduction layer group is located on a side of the high-frequency noise reduction layer group close to a noise source. The surface of the low-frequency noise reduction layer group close to the noise source has a plurality of noise reduction holes.

2. The sound-absorbing and heat-insulating structure according to claim 1, characterized in that: The low-frequency noise reduction layer group includes a first sheet metal layer, a non-woven fabric layer and a polyester fiber layer which are arranged in sequence from a side close to the noise source toward the high-frequency noise reduction layer group; the multiple noise reduction holes include a plurality of through holes arranged in the first sheet metal layer; the high-frequency noise reduction layer group includes a second sheet metal layer and a foaming layer located on a side of the second sheet metal layer close to the low-frequency noise reduction layer group.

3. The sound-absorbing and heat-insulating structure according to claim 2, characterized in that: The thickness of the first sheet metal layer is smaller than the thickness of the second sheet metal layer.

4. The sound-absorbing and heat-insulating structure according to claim 2, characterized in that: The hole pitch of the plurality of through holes is 1.2 to 2 times of the hole diameter; the hole diameter of each through hole is 1 to 5 mm.

5. The sound-absorbing and heat-insulating structure according to claim 2, characterized in that: The foaming layer comprises a rubber-plastic foaming layer or an extruded polystyrene foam plastic layer.

6. The sound-absorbing and heat-insulating structure according to claim 2, characterized in that: The non-woven fabric layer is a polylactic acid layer, and the weight of the non-woven fabric layer per square meter is 20 to 100 g.

7. The sound-absorbing and heat-insulating structure according to claim 2, characterized in that: The density of the polyester fiber layer is 120 to 200 kg / m 3 .

8. The sound-absorbing and heat-insulating structure according to claim 2, characterized in that: The total thickness of the sound-absorbing and heat-insulating structure is 30 to 50 mm; The thickness of the first sheet metal layer is 0.5 to 1.2 mm, the thickness of the foaming layer is 10 to 25 mm, the thickness of the polyester fiber layer is 10 to 25 mm, and the thickness of the second sheet metal layer is 0.8 to 2 mm.

9. A machine inside a wind cabinet, characterized in that: It comprises the sound-absorbing and heat-insulating structure as described in any one of claims 1 to 8.

10. An air supply duct, characterized in that: It comprises the sound-absorbing and heat-insulating structure as described in any one of claims 1 to 8.

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