Noise reduction assembly and all-air system

Abstract

The utility model relates to a noise reduction assembly. The noise reduction assembly comprises a noise reduction box and a noise reduction structure. The silencing box is provided with a first air inlet, the first air inlet is communicated and connected with the air outlet end of a cabinet body to be subjected to silencing, and the silencing structure is fixedly arranged in the silencing box; the noise reduction structure comprises a plurality of first noise reduction layers, and a plurality of noise reduction holes are formed in the first noise reduction layers. The noise reduction assembly can effectively reduce noise generated by airflow output by the air outlet end of the cabinet body to be subjected to noise reduction, meanwhile, the airflow speed is reduced, airflow flowing pressure is converted into static pressure, conveying resistance can be better overcome, and the airflow can be conveyed to a farther distance space.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to a noise reduction component and a full air system. Background Art

[0002] In a full-air system, the external airflow is generally transported from the air inlet of the air handling unit cabinet to the inside of the air handling unit cabinet for processing, and the processed airflow is then pumped out by the fan to the external environment. In the past, the pipe interface for conveying airflow was directly connected to the air outlet of the fan. The high-speed wind pumped out by the fan produced a lot of noise, especially when multiple full-air systems were working in the same area, which would inevitably lead to excessive noise, affecting people's lives and even damaging people's health; in addition, the airflow pumped out by the fan was directly transported through the pipeline, and the airflow transportation distance was limited due to the influence of pipeline resistance. Utility Model Content

[0003] Based on this, the purpose of the utility model is to provide a noise reduction component, which can effectively reduce the noise generated by the air flow output from the air outlet end of the cabinet to be silenced by arranging a silencer box at the air outlet end of the cabinet to be silenced, and arranging a silencer structure in the silencer box, and designing the silencer box and the silencer structure; at the same time, the air flow velocity can be reduced, and the air flow pressure can be converted into static pressure, which can better overcome the conveying resistance, enable the airflow to be conveyed to a farther distance space area, and improve the heat exchange rate of the system.

[0004] Another object of the utility model is to provide a full-air system, which can effectively reduce the noise generated by the air flow output from the air outlet of the cabinet to be silenced by arranging a noise reduction component at the air outlet of the cabinet to be silenced; at the same time, it can reduce the air flow speed and convert the air flow pressure into static pressure, so that the air flow can be transported to a farther distance space area, thereby improving the heat exchange rate of the system.

[0005] A noise reduction component, comprising:

[0006] Silence boxes and silencer structures;

[0007] The muffler box is provided with a first air inlet, the first air inlet is conductively connected to the air outlet of the cabinet to be silenced, and the muffler structure is fixedly arranged in the muffler box;

[0008] The sound-absorbing structure comprises a plurality of first sound-absorbing layers, and the first sound-absorbing layers are provided with a plurality of sound-absorbing holes.

[0009] Furthermore, the diameter of the muffler hole is 1 mm to 3 mm;

[0010] The plurality of silencer holes are arranged at equal intervals, and the distance between the centers of every two adjacent silencer holes is greater than 5 times the diameter of the silencer hole.

[0011] Furthermore, the air outlet end of the cabinet to be silenced is provided with a cabinet air outlet, and the total area of ​​the plurality of silencer holes is greater than 1.5 to 2 times the area of ​​the cabinet air outlet.

[0012] Furthermore, the sound-absorbing structure further comprises a second sound-absorbing layer and a third sound-absorbing layer, and the first sound-absorbing layer is sandwiched between the second sound-absorbing layer and the third sound-absorbing layer;

[0013] The thickness of the third sound-absorbing layer is defined as h, and the thickness ratio of the first sound-absorbing layer, the second sound-absorbing layer and the third sound-absorbing layer is (7.5-20)h:(2-4)h:h.

[0014] Furthermore, the diameter of the muffler hole is 1.5 to 2.5 mm;

[0015] The distance between the centers of each two adjacent muffler holes is 7.5 to 12.5 mm;

[0016] The total area of ​​the plurality of silencer holes is 1.8 to 2 times greater than the area of ​​the cabinet air outlet;

[0017] The thickness of the first sound-absorbing layer is 10-15 mm; the thickness of the second sound-absorbing layer is 3-4 mm; and the thickness of the third sound-absorbing layer is 1-2 mm.

[0018] Furthermore, the sound-absorbing structure is attached to the wall surface of the inner cavity of the sound-absorbing box.

[0019] Furthermore, an air inlet box is provided at the air inlet end of the cabinet to be silenced, an air outlet end of the air inlet box is conductively connected to the air inlet end of the cabinet to be silenced, and the silencer structure is attached to the wall surface of the inner cavity of the air inlet box.

[0020] Furthermore, the size of the first air inlet is equal to or larger than the cabinet air outlet, and the cross-sectional area of ​​the muffler box along the air flow direction is larger than the opening area of ​​the cabinet air outlet;

[0021] The air inlet end of the air inlet box is provided with a second air inlet, and the cross-sectional area of ​​the air inlet box along the air flow direction is larger than the opening area of ​​the second air inlet.

[0022] Further, the end surface of the air inlet end of the muffler box is provided with a plurality of card plates, the end surface of the air outlet end of the cabinet to be silenced is provided with a matching card slot, and the card plates are connected to the card slots; or, the end surface of the air outlet end of the cabinet to be silenced is provided with a plurality of card plates, the end surface of the air inlet end of the muffler box is provided with a matching card slot, and the card plates are connected to the card slots;

[0023] A sealing member is provided at the connection between the muffler box and the cabinet to be muffled.

[0024] A full air system comprises the noise reduction component and an air inlet box described in the utility model.

[0025] The beneficial effects of the utility model are:

[0026] (1) By arranging a silencer box at the air outlet of the cabinet to be silenced, arranging a silencer structure in the silencer box, and designing the silencer box and the silencer structure, the noise generated by the airflow output from the air outlet of the cabinet to be silenced can be effectively reduced; at the same time, the airflow velocity can be reduced, and the airflow flow pressure can be converted into static pressure, which can better overcome the conveying resistance, so that the airflow can be conveyed to a farther distance space area, thereby improving the heat exchange rate of the system;

[0027] (2) By adopting a multi-layer sound-absorbing structure, a better sound-absorbing effect is achieved compared with a single layer; at the same time, the parameters of the multi-layer sound-absorbing layer of the sound-absorbing structure are optimized to further improve the sound-absorbing effect of the sound-absorbing structure, thereby further reducing noise;

[0028] (3) By setting a silencer structure in the air inlet box of the full air system, the overall noise of the full air system can be reduced;

[0029] (4) The silencer box is fixed to the cabinet to be silenced by snapping, which can reduce the noise generated by vibration when the unit is working, and silencers of different sizes can be replaced at any time according to actual needs;

[0030] By setting a seal at the connection, it is possible to prevent airflow from flowing out of the gap at the connection to cause airflow loss and noise. It can also further stabilize the connection between the silencer box and the cabinet to be silenced, thereby reducing the noise generated by vibration when the unit in the cabinet to be silenced is running.

[0031] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the installation structure of the noise reduction component provided in an embodiment of the present application;

[0033] Figure 2 An exploded view of the installation structure of the noise reduction component provided in the embodiment of the present application;

[0034] Figure 3 A schematic diagram of a noise reduction structure provided in an embodiment of the present application;

[0035] Figure 4 An enlarged structural diagram of the first sound-absorbing layer provided in an embodiment of the present application;

[0036] Figure 5 A schematic diagram of the structure of the all-air system provided in an embodiment of the present application.

[0037] In the figure: 1-cabinet to be silenced; 1a-cabinet air outlet; 10-silencing box; 11-first air inlet; 12-card plate; 12a-card slot; 20-silencing structure; 21-first sound-absorbing layer, 22-second sound-absorbing layer; 23-third sound-absorbing layer; 21a-silencing hole; 30-air inlet box; 31-second air inlet. DETAILED DESCRIPTION

[0038] 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 in 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.

[0039] In the description of the present invention, it should be noted that the terms "vertical direction", "upper", "lower", "horizontal" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, or a connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Regarding the problem of a large amount of noise generated by the full air system during operation, after analysis, it is found that the noise at the air outlet of the full air system mainly comes from the noise generated by the flow of air, the noise generated by the vibration of the unit during operation, and the noise generated by the friction between the airflow and the pipe wall, etc. The noise generated by the flow of air is related to the airflow velocity. The greater the flow velocity, the greater the noise generated. Therefore, the noise generated by the airflow at the fan outlet is the greatest. If such a high wind speed at the fan outlet is directly guided to the external environment through an external air outlet duct, even if the airflow flowing through the duct will reduce its speed due to the influence of the duct resistance, the flow rate of the airflow coming out of the duct outlet is still relatively large, which will inevitably generate a large noise. Therefore, it is necessary to set up a component that can reduce the airflow velocity to reduce the noise of the air outlet process, and at the same time, absorb the noise by designing an effective silencing structure.

[0042] Based on this, the utility model provides a noise reduction component, which reduces the airflow velocity by setting a silencer box at the air outlet end of the cabinet to be silenced and converts the airflow flow pressure into static pressure. At the same time, a silencer structure is set in the silencer box, and the silencer structure is designed and its various parameters are optimized so that the silencer structure can effectively absorb the noise generated during the airflow output from the air outlet end of the cabinet to be silenced.

[0043] Please also see Figure 1 and Figure 2 The embodiment of the present application provides a noise reduction component, which involves a cabinet 1 to be silenced. The cabinet 1 to be silenced is a full air handling equipment cabinet, which is equipped with a surface cooler and a fan (not shown in the figure). The surface cooler processes the airflow entering the full air handling equipment cabinet, and then draws the airflow to the outside of the full air handling equipment cabinet through the fan. The noise reduction component includes a silencer box 10 and a silencer structure 20. The silencer box 10 is provided with a first air inlet 11, and the first air inlet 11 is conductively connected to the air outlet end of the cabinet 1 to be silenced, and the silencer structure 20 is fixed in the silencer box 10.

[0044] Specifically, the air outlet end of the cabinet 1 to be silenced is provided with a cabinet air outlet 1a, and the connection position of the silencer box 10 and the cabinet 1 to be silenced is determined by the opening position of the cabinet air outlet 1a. In this embodiment, since the cabinet air outlet 1a and the fan air outlet are arranged opposite to each other, and the fan is fixedly arranged on the top of the cabinet 1 to be silenced, the silencer box 10 is fixedly arranged on the top outer wall of the cabinet 1 to be silenced. The first air inlet 11 is opened on one side of the silencer box 10, and the first air inlet 11 is conductively connected with the cabinet air outlet 1a, so that the airflow enters the silencer box 10 from the cabinet air outlet 1a, and then flows from the air outlet end of the silencer box 10 to the external area through the external air outlet duct. The air outlet end of the silencer box 10 can be arranged on any surface of the silencer box 10 where the first air inlet 11 is not provided. Preferably, the air outlet end of the silencer box 10 is arranged on a surface opposite to the first air inlet 11, and the first air inlet 11 is opposite to the cabinet air outlet 1a to avoid additional wind resistance caused by bending of the airflow in the silencer box 10.

[0045] It can be understood that according to the formula: air volume = wind speed × cross-sectional area, it can be known that when the air volume is constant, the wind speed is inversely proportional to the cross-sectional area flowing through. In this embodiment, since the cabinet air outlet 1a is arranged at the air outlet end of the fan, when the power of the fan is constant, the air volume at the cabinet air outlet 1a is rated. As an exemplary embodiment, the silencer box 10 is a square column box with the same cross-section along the air flow direction. The size of the first air inlet 11 is equal to or larger than the cabinet air outlet 1a. The cross-sectional area of ​​the cabinet air outlet 1a is 495mm×245mm, and the cross-sectional area of ​​the internal cavity of the silencer box 10 is 642mm×600mm. Assume that the rated air volume of the wind from the cabinet air outlet 1a is 3000m 3 / h, it can be concluded that the wind speed of the cabinet air outlet 1a is 6.8m / h, and the wind speed when the wind flows to the internal cavity of the muffler 10 is reduced to 2.1m / s. It can be seen that the airflow enters the interior of the muffler 10 from the cabinet air outlet 1a, the speed decreases, and the noise also decreases at this time. In addition, the airflow in this embodiment can be regarded as an ideal fluid. According to the principle of energy conservation when the ideal fluid is in steady flow, when the airflow speed becomes smaller, the dynamic pressure inside the muffler 10 becomes smaller, the dynamic pressure is converted into static pressure, and the static pressure increases. The ability of large static pressure to overcome the transportation resistance is stronger, which means that when the length of the external air outlet duct is the same, the airflow loss of the static pressure airflow is smaller. Therefore, when the cross-sectional area of ​​the muffler 10 along the airflow direction is larger than the opening area of ​​the cabinet air outlet 1a, it can not only reduce the airflow velocity and thus reduce the noise, but also at this time the dynamic pressure is converted into static pressure, and the airflow can be transported to a farther space area. It should be noted that when the opening of the first air inlet 11 is smaller than the cabinet air outlet 1a, when the air flow flows through the connection between the cabinet air outlet 1a and the first air inlet 11, the air flow velocity will increase sharply due to the air flow flowing from a large cross-section to a small cross-section. Therefore, it is necessary to ensure that the size of the first air inlet 11 is equal to or larger than the cabinet air outlet 1a.

[0046] The end face of the air inlet end of the muffler box 10 is provided with a plurality of card plates 12, and the end face of the air outlet end of the cabinet body 1 to be silenced is provided with a matching card slot 12a, and the card plates 12 are snapped into the card slots 12a, so that the end face of the air inlet end of the muffler box 10 is in contact with the end face of the air outlet end of the cabinet body 1 to be silenced. Alternatively, the end face of the air outlet end of the cabinet body 1 to be silenced is provided with a plurality of card plates 12, and the end face of the air inlet end of the muffler box 10 is provided with a matching card slot 12a, and the card plates 12 are snapped into the card slots 12a. It can be understood that when the opening size of the first air inlet 11 is equal to or larger than the cabinet air outlet 1a and smaller than the end face of the air inlet end of the muffler box 10, the card plates 12 can be set at any position of the end face of the air inlet end of the muffler box 10. The silencer box 10 is fixedly connected to the cabinet 1 to be silenced by this plug-in method, which facilitates the connection and ensures the stability of the connection to reduce the noise caused by vibration when the unit is working. The silencer box 10 of different sizes can be replaced at any time according to actual needs.

[0047] In other embodiments, a connector is provided around the edge of the first air inlet 11, the connector protrudes from the outer wall of the sound-absorbing box 10, and the shape and size of the connector match the cabinet air outlet 1a, so that the connector is firmly inserted into the cabinet air outlet 1a. Alternatively, a connector is provided around the edge of the cabinet air outlet 1a, the connector protrudes from the outside of the cabinet 1 to be silenced, and the shape and size of the connector match the first air inlet 11, so that the connector is firmly inserted into the first air inlet 11.

[0048] As a further embodiment, a seal is provided at the connection between the silencer box 10 and the cabinet 1 to be silenced. Specifically, the seal is arranged around the outer surface of the connection between the silencer box 10 and the cabinet 1 to be silenced. In other embodiments, the seal is clamped between the connector and the cabinet air outlet 1a or between the connector and the first air inlet 11. The seal is made of a material with good sealing and buffering properties, preferably a rubber seal. By providing the seal, on the one hand, it can prevent the airflow from flowing out of the gap at the connection between the silencer box 10 and the cabinet 1 to be silenced, causing airflow loss, and the noise generated at the same time. On the other hand, it can further stabilize the connection between the silencer box 10 and the cabinet air outlet 1a, thereby reducing the noise generated by the vibration when the internal unit of the cabinet 1 to be silenced is running.

[0049] Please also see Figure 3 and Figure 4The sound-absorbing structure 20 includes a plurality of first sound-absorbing layers 21, a second sound-absorbing layer 22 and a third sound-absorbing layer 23. The first sound-absorbing layer 21 is provided with a plurality of sound-absorbing holes 21a, and is sandwiched between the second sound-absorbing layer 22 and the third sound-absorbing layer 23. The first sound-absorbing layer 21, the second sound-absorbing layer 22 and the third sound-absorbing layer 23 are tightly fitted to form an integral structure. The first sound-absorbing layer 21 is a sound-absorbing layer made of noise-reducing and sound-absorbing material, and can be specifically made of sound-insulating material, sound-absorbing material or a material with good sound-reflecting performance for sound waves, preferably a sound-absorbing material, which has a good sound-absorbing effect on noise. The second sound-absorbing layer 22 is a sound-absorbing layer made of shock-absorbing and noise-reducing material, and can be specifically made of rubber, damping rubber and other materials, preferably damping rubber. The damping rubber layer not only has a good sound-absorbing effect, but also has a vibration reduction function, so as to achieve noise reduction by reducing the vibration of the sound-absorbing box 10. The third sound-absorbing layer 23 is a sound-absorbing layer made of a metal material, which can be a zinc foil layer, an aluminum foil layer, etc., preferably an aluminum foil layer. The aluminum foil layer has good reflection and blocking effects on noise, can reflect and block sound waves, and also has good heat insulation effects to prevent the hot air or cold air flowing out of the cabinet air outlet 1a from transferring heat in the sound-absorbing box 10 and causing heat loss.

[0050] In order to further enhance the sound absorption effect, the size of the sound-absorbing hole 21a, the distance between the centers of each two adjacent sound-absorbing holes 21a, the thickness of each sound-absorbing layer and other parameters are optimized and designed. In this embodiment, in order to ensure that the maximum friction force is generated between the sound wave with the shortest wavelength within the hearing range of the human ear and the sound-absorbing hole 21a to obtain the maximum sound-absorbing coefficient, the diameter of the sound-absorbing hole 21a is 1mm to 3mm. At the same time, multiple sound-absorbing holes 21a are evenly arranged at equal intervals. When the distance between the centers of two adjacent sound-absorbing holes 21a is too close, the number of sound-absorbing holes 21a is arranged more, and the area of ​​the sound-absorbing cotton is correspondingly smaller. The sound-absorbing cotton originally has a higher sound-absorbing coefficient, which will reduce the sound-absorbing coefficient of the entire sound-absorbing layer. Therefore, the distance between the centers of each two adjacent sound-absorbing holes 21a is greater than 5 times the diameter of the sound-absorbing hole 21a. In addition, in order to ensure a sufficiently large area of ​​the sound-absorbing layer, the total area of ​​the multiple sound-absorbing holes 21a is greater than 1.5 to 2 times the area of ​​the cabinet air outlet 1a. It should be noted that the total area of ​​the sound-absorbing holes 21a cannot be increased simply by reducing the distance between the centers of adjacent sound-absorbing holes 21a. As mentioned above, the distance between the centers of adjacent sound-absorbing holes 21a must ensure that the sound-absorbing layer has a large sound-absorbing coefficient. Therefore, when the distance between the centers of adjacent sound-absorbing holes 21a is constant, it is necessary to increase the total area of ​​the sound-absorbing holes 21a by increasing the laying area of ​​the entire sound-absorbing structure 20. Furthermore, the thickness of the first sound-absorbing layer 21, the second sound-absorbing layer 22 and the third sound-absorbing layer 23 is designed. When the sound-absorbing coefficient is improved, the total thickness of the three sound-absorbing layers is not the thicker the better. Too thick sound-absorbing layers attached to the sound-absorbing box 10 will cause greater wind resistance, and as mentioned above, will also reduce the cross-sectional area of ​​the sound-absorbing box 10, which is not conducive to reducing the wind speed and the pressure conversion of the airflow. Therefore, the thickness ratio of the first sound-absorbing layer 21, the second sound-absorbing layer 22 and the third sound-absorbing layer 23 is (7.5~20)h:(2~4)h:h, where h is the thickness of the third sound-absorbing layer 23. Preferably, the diameter of the muffler hole 21a is 1.5-2.5 mm, the distance between the centers of each two adjacent muffler holes 21a is 7.5-12.5 mm, the total area of ​​the multiple muffler holes 21a is greater than 1.8-2 times the area of ​​the cabinet air outlet 1a, the thickness of the first muffler layer 21 is 10-15 mm, the thickness of the second muffler layer 22 is 3-4 mm, and the thickness of the third muffler layer 23 is 1-2 mm. Most preferably, the diameter of the muffler hole 21a is 2 mm, the distance between the centers of each two adjacent muffler holes 21a is 10 mm, the total area of ​​the multiple muffler holes 21a is greater than 2 times the area of ​​the cabinet air outlet 1a, the thickness of the first muffler layer 21 is 15 mm, the thickness of the second muffler layer 22 is 2 mm, and the thickness of the third muffler layer 23 is 1 mm.

[0051] The sound-absorbing structure 20 is attached to the inner cavity wall of the sound-absorbing box 10. Specifically, the second sound-absorbing layer 22 abuts against the inner cavity wall of the sound-absorbing box 10, or the third sound-absorbing layer 23 abuts against the inner cavity wall of the sound-absorbing box 10. In this embodiment, the second sound-absorbing layer 22 abuts against the inner cavity wall of the sound-absorbing box 10. Compared with a single-layer sound-absorbing layer, the multi-layer sound-absorbing structure 20 has a better noise reduction effect. The specific sound-absorbing process is as follows: when the noise reaches the third sound-absorbing layer 23, a part of the sound waves is reflected and blocked by the third sound-absorbing layer 23, and returns to the inside of the sound-absorbing box 10, reducing the noise intensity. The remaining part of the noise penetrates the third sound-absorbing layer 23 and enters the second sound-absorbing layer 22. The sound waves rub against the wall surface of the sound-absorbing hole 21a in the second sound-absorbing layer 22, and part of the sound energy is converted into heat energy and dissipated, so that the sound waves passing through the second sound-absorbing layer 22 are weakened, thereby further reducing the noise intensity. In addition, the noise passing through the second sound-absorbing layer 22 enters the first sound-absorbing layer 21. The damping rubber layer of the first sound-absorbing layer 21 can not only absorb the sound waves, but also further reduce the noise intensity by reducing vibration. Finally, only a small amount of noise is transmitted from the sound-absorbing box 10 to the outside.

[0052] See also Figure 5 Furthermore, an air inlet box 30 is provided at the air inlet end of the cabinet 1 to be silenced, and the air outlet end of the air inlet box 30 is conductively connected to the air inlet end of the cabinet 1 to be silenced, and a second air inlet 31 is provided at the air inlet end of the air inlet box 30, and the second air inlet 31 is used to connect an external air inlet duct, and the external air inlet duct guides the external airflow into the air inlet box 30, and then flows to the cabinet 1 to be silenced for processing. In this process, a large amount of noise is also generated. In order to reduce the noise generated during the air intake process of the air inlet box 30, a sound-absorbing structure 20 is attached to the wall surface of the internal cavity of the air inlet box 30. Similarly, the second sound-absorbing layer 22 can be abutted against the wall surface of the internal cavity of the air inlet box 30, and the third sound-absorbing layer 23 can also be abutted against the wall surface of the internal cavity of the air inlet box 30. In this embodiment, the second sound-absorbing layer 22 is abutted against the wall surface of the internal cavity of the air inlet box 30. When the air flow flows into the air inlet box 30 from the second air inlet 31, the sound waves generated by the air flow are first transmitted to the third sound-absorbing layer 23. The third sound-absorbing layer 23 reflects and blocks a part of the sound waves, and the other part of the sound waves is transmitted to the first sound-absorbing layer 21. The sound waves rub against the wall surface of the sound-absorbing hole 21a in the second sound-absorbing layer 22, and part of the sound energy is converted into heat energy and dissipated, and the remaining part of the sound waves is transmitted to the second sound-absorbing layer 22. The second sound-absorbing layer 22 further absorbs the sound waves and can achieve the noise reduction effect by reducing the vibration of the air inlet box 30.

[0053] Furthermore, the opening size of the second air inlet 31 and the cross-sectional area size of the air inlet box 30 are analyzed. As an exemplary embodiment, the air inlet box 30 is a square column box with the same cross-section along the air flow direction, the cross-sectional area of ​​the second air inlet 31 is 495mm×245mm, and the cross-sectional area of ​​the internal cavity of the air inlet box 30 is 600mm×300mm. Assuming that the rated air volume entering the air inlet box 30 from the second air inlet 31 is 3000m 3 / h, it can be concluded that the wind speed at the second air inlet 31 is 6.8m / h, and the wind speed when the wind flows to the internal cavity of the air inlet box 30 is reduced to 4.6m / s. The airflow enters the air inlet box 30 from the second air inlet 31, and the speed decreases, and the noise decreases at this time. In addition, the external air inlet duct input to the second air inlet 31 is an ideal fluid. According to the principle of energy conservation when the ideal fluid is in steady flow, when the speed of the airflow decreases, the dynamic pressure in the air inlet box 30 decreases, the dynamic pressure is converted into static pressure, and the static pressure increases. The ability of large static pressure to overcome the transport resistance is stronger. Therefore, after the airflow passes through the air inlet box 30, the static pressure airflow loss is smaller, thereby reducing the airflow input from the outside, reducing the power required for the input airflow, and thus reducing energy consumption. Therefore, when the cross-sectional area of ​​the air inlet box 30 along the airflow direction is greater than the opening area of ​​the second air inlet 31, not only can the airflow velocity be reduced to reduce noise, but also the dynamic pressure is converted into static pressure at this time, which can reduce the loss of airflow passing through the air inlet box 30.

[0054] Similarly, as a further embodiment, a seal is provided at the connection between the second air inlet 31 and the external air inlet pipe. The seal can be sandwiched between the second air inlet 31 and the external air inlet duct, or can be surrounded by the outer surface of the connection between the external air inlet duct and the air inlet box 30. The seal is made of a material with good sealing performance and buffering effect, preferably a rubber material. By providing the seal, it is possible to prevent the airflow from flowing out of the gap at the connection, causing airflow loss and noise generated at the same time.

[0055] The embodiment of the present application also provides an all-air system, comprising any of the above-mentioned noise reduction components and an air inlet box 30.

[0056] Compared with the prior art, the beneficial effects of the technical solution of this application are:

[0057] (1) By arranging a silencer box at the air outlet of the cabinet to be silenced, arranging a silencer structure in the silencer box, and designing the silencer box and the silencer structure, the noise generated by the airflow output from the air outlet of the cabinet to be silenced can be effectively reduced; at the same time, the airflow velocity can be reduced, and the airflow flow pressure can be converted into static pressure, which can better overcome the conveying resistance, so that the airflow can be conveyed to a farther distance space area, thereby improving the heat exchange rate of the system;

[0058] (2) By adopting a multi-layer sound-absorbing structure, a better sound-absorbing effect is achieved compared with a single layer; at the same time, the parameters of the multi-layer sound-absorbing layer of the sound-absorbing structure are optimized to further improve the sound-absorbing effect of the sound-absorbing structure, thereby further reducing noise;

[0059] (3) By setting a silencer structure in the air inlet box of the full air system, the overall noise of the full air system can be reduced;

[0060] (4) The silencer box is fixed to the cabinet to be silenced by snapping, which can reduce the noise generated by vibration when the unit is working, and silencers of different sizes can be replaced at any time according to actual needs;

[0061] By setting a seal at the connection, it is possible to prevent airflow from flowing out of the gap at the connection to cause airflow loss and noise. It can also further stabilize the connection between the silencer box and the cabinet to be silenced, thereby reducing the noise generated by vibration when the unit in the cabinet to be silenced is running.

[0062] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and the utility model is also intended to include these modifications and modifications.

Claims

1. A noise reduction component, characterized in that: include: Silence boxes and silencer structures; The muffler box is provided with a first air inlet, the first air inlet is conductively connected to the air outlet of the cabinet to be silenced, and the muffler structure is fixedly arranged in the muffler box; The sound-absorbing structure comprises a plurality of first sound-absorbing layers, and the first sound-absorbing layers are provided with a plurality of sound-absorbing holes.

2. The noise reduction assembly according to claim 1, characterized in that: The diameter of the muffler hole is 1 mm to 3 mm; The plurality of silencer holes are arranged at equal intervals, and the distance between the centers of every two adjacent silencer holes is greater than 5 times the diameter of the silencer hole.

3. The noise reduction assembly according to claim 2, characterized in that: The air outlet end of the cabinet to be silenced is provided with a cabinet air outlet, and the total area of ​​the plurality of silencer holes is greater than 1.5 to 2 times the area of ​​the cabinet air outlet.

4. The noise reduction assembly according to claim 3, characterized in that: The sound-absorbing structure further comprises a second sound-absorbing layer and a third sound-absorbing layer, wherein the first sound-absorbing layer is sandwiched between the second sound-absorbing layer and the third sound-absorbing layer; The thickness of the third sound-absorbing layer is defined as h, and the thickness ratio of the first sound-absorbing layer, the second sound-absorbing layer and the third sound-absorbing layer is (7.5-20)h:(2-4)h:h.

5. The noise reduction assembly according to claim 4, characterized in that: The diameter of the muffler hole is 1.5 to 2.5 mm; The distance between the centers of each two adjacent muffler holes is 7.5 to 12.5 mm; The total area of ​​the plurality of silencer holes is 1.8 to 2 times greater than the area of ​​the cabinet air outlet; The thickness of the first sound-absorbing layer is 10-15 mm; the thickness of the second sound-absorbing layer is 3-4 mm; and the thickness of the third sound-absorbing layer is 1-2 mm.

6. The noise reduction assembly according to claim 5, characterized in that: The sound-absorbing structure is attached to the inner cavity wall of the sound-absorbing box.

7. The noise reduction assembly according to claim 6, characterized in that: An air inlet box is provided at the air inlet end of the cabinet to be silenced, an air outlet end of the air inlet box is conductively connected to the air inlet end of the cabinet to be silenced, and the silencer structure is attached to the wall surface of the inner cavity of the air inlet box.

8. The noise reduction assembly according to claim 7, characterized in that: The size of the first air inlet is equal to or larger than the cabinet air outlet, and the cross-sectional area of ​​the muffler box along the air flow direction is larger than the opening area of ​​the cabinet air outlet; The air inlet end of the air inlet box is provided with a second air inlet, and the cross-sectional area of ​​the air inlet box along the air flow direction is larger than the opening area of ​​the second air inlet.

9. The noise reduction assembly according to claim 8, characterized in that: The end surface of the air inlet end of the muffler box is provided with a plurality of card plates, the end surface of the air outlet end of the cabinet to be silenced is provided with a matching card slot, and the card plates are connected to the card slots; or, the end surface of the air outlet end of the cabinet to be silenced is provided with a plurality of card plates, the end surface of the air inlet end of the muffler box is provided with a matching card slot, and the card plates are connected to the card slots; A sealing member is provided at the connection between the muffler box and the cabinet to be muffled.

10. An all-air system, characterized in that: The noise reduction component comprises any one of claims 1-9.

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