Combined wind pipe noise elimination static pressure device

Abstract

The utility model discloses a combined formula air pipe silencing static pressure device, including the box, the box includes detachable inner casing and outer casing, the inner casing and the interlayer cavity are formed between outer casing, the interlayer cavity is filled with the composite sound absorption layer, the bottom of box is provided with the air inlet, one side of box is provided with the air outlet, the bottom fixedly connected with the silencing subassembly of box, the both ends opening of silencing subassembly and intercommunication, one end communicates with the air inlet, the inside of silencing subassembly evenly is provided with a plurality of sound attenuation piece, through the big cross section space expansion airflow channel of box, can high -efficiently with airflow dynamic pressure conversion static pressure, the airflow turbulence phenomenon is reduced significantly, through a plurality of sound attenuation piece segmentation and form a plurality of air inlet channel, prolong the airflow path, and the sound attenuation piece adopts micropore galvanized aluminum magnesium board sandwich rock wool board structure, and the composite sound absorption layer of filling centrifugal glass wool board and polyurethane foam sound absorption board in interlayer cavity is combined, and the noise reduction effect is greatly improved.

Description

Technical Field

[0001] This utility model relates to the technical field of air conditioning and ventilation, specifically to a combined duct noise reduction and static pressure device. Background Technology

[0002] The static pressure box is a key component in the ventilation and air conditioning system. It mainly buffers, stabilizes and rectifies the airflow through its internal cavity structure, solving problems such as uneven airflow, large wind speed fluctuations and excessive local resistance in the ventilation system. It is the core hub connecting the ventilation duct and the terminal air outlet, and directly affects the air supply efficiency, noise control and indoor comfort of the air conditioning system. In particular, due to the limited space in the computer room, the effective silencing length of the duct silencer is limited. Most equipment is directly connected to the air duct at the air inlet and outlet. Since there is often a difference between the cross-section of the air duct and the cross-section of the equipment air outlet, the airflow is prone to uneven flow velocity and large dynamic pressure fluctuations during the flow process, which in turn generates turbulent noise. This noise not only affects the comfort of the indoor and outdoor environment, but may also cause damage to the equipment structure in the long run.

[0003] Therefore, there is an urgent need for a static pressure device that can achieve good noise reduction to solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of this utility model is to meet the technical requirements of the static pressure box with silencing effect proposed in the background art, and to propose a combined duct silencing static pressure device.

[0005] The objective of this utility model can be achieved through the following technical solutions: A combined duct silencing and static pressure device includes a housing, which comprises a detachable inner shell and an outer shell, with a sandwich cavity formed between the inner shell and the outer shell. The sandwich cavity is filled with a composite sound-absorbing layer. An air inlet is provided at the bottom of the housing, and an air outlet is provided on one side of the housing. A silencing component is fixedly connected to the bottom of the housing. The two ends of the silencing component are open and interconnected, with one end connected to the air inlet. A plurality of silencing plates are evenly arranged inside the silencing component.

[0006] As a further aspect of this utility model, the sound-absorbing plate divides the interior of the sound-absorbing component into multiple air inlet channels.

[0007] As a further embodiment of this utility model: the sound-absorbing sheet includes microporous galvanized aluminum-magnesium plates on both sides and a sandwich rock wool plate in the middle.

[0008] As a further aspect of this utility model, the thickness of the sound-absorbing sheet is 50mm.

[0009] As a further embodiment of this utility model: the composite sound-absorbing layer is composed of centrifugal glass wool board and polyurethane foam sound-absorbing board, wherein the polyurethane foam sound-absorbing board is closer to the outer shell and the centrifugal glass wool board is closer to the inner shell.

[0010] As a further embodiment of this utility model: the surface of the composite sound-absorbing layer is covered with a non-woven fabric covering layer.

[0011] As a further embodiment of this utility model: the thickness of the centrifugal glass wool board is 50mm; the thickness of the polyurethane foam sound-absorbing board is 30mm.

[0012] As a further aspect of this utility model, the height of the sound-absorbing component is not less than 2 / 3 of the height of the enclosure.

[0013] As a further embodiment of this utility model: an EPDM rubber sealing gasket is provided at the connection between the sound-absorbing component and the air inlet.

[0014] As a further aspect of this utility model, the enclosure and the sound-absorbing component are detachable.

[0015] The beneficial effects of this utility model are: 1. By expanding the airflow channel through the large cross-section of the enclosure, the airflow pressure can be efficiently converted into static pressure, significantly reducing airflow turbulence and reducing turbulence noise at the source. At the same time, the sound-absorbing components built into the enclosure are divided into multiple air intake channels by several sound-absorbing plates, extending the airflow path. The sound-absorbing plates adopt a microporous galvanized aluminum-magnesium plate sandwich rock wool board structure, combined with a composite sound-absorbing layer of centrifugal glass wool board and polyurethane foam sound-absorbing board filled in the sandwich cavity, forming a dual sound-absorbing structure of turbulence suppression and sound absorption, which greatly improves the noise reduction effect and achieves sound absorption, static pressure, and airflow stabilization effects, reducing the noise of airflow during ventilation and air conditioning operation. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a cross-sectional view of the entire utility model; Figure 2 This is a structural schematic diagram of the box body of this utility model; Figure 3 This is a schematic diagram of the structure of the noise reduction component of this utility model; Figure 4 This is a schematic diagram of the composite sound-absorbing layer of this utility model; Figure 5 This is a schematic diagram of the structure of the sound-absorbing sheet of this utility model; In the diagram: 1. Box body; 101. Inner shell; 102. Outer shell; 2. Air inlet; 3. Air outlet; 4. Silencing component; 5. Silencing sheet; 51. Microporous galvanized aluminum-magnesium plate; 52. Sandwich rock wool board; 6. Composite sound-absorbing layer; 601. Centrifugal glass wool board; 602. Polyurethane foam sound-absorbing board; 603. Non-woven fabric covering layer. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-5 As shown, this utility model is a combined duct noise reduction and static pressure device, including a housing 1. The housing 1 includes a detachable inner shell 101 and an outer shell 102. The detachable structure includes, but is not limited to, a snap-fit ​​structure, and can be fixed by bolts or other means. The inner shell 101 is made of microporous galvanized aluminum-magnesium sheet, and the outer shell 102 is made of galvanized steel sheet / stainless steel. A cavity is formed between the inner shell 101 and the outer shell 102, and the cavity is filled with a composite sound-absorbing layer 6. An air inlet 2 is provided at the bottom of the housing 1, and an air outlet 3 is provided on one side of the housing 1. A noise reduction component 4 is fixedly connected to the bottom of the housing 1. The sound-absorbing components are open at both ends and interconnected. One end is connected to the air inlet 2, and the other end is matched and connected to the air inlet pipe interface of the ventilation system. Several sound-absorbing plates 5 are evenly arranged inside the sound-absorbing component 4. The sound-absorbing plates 5 divide the interior of the sound-absorbing component 4 into multiple air inlet channels. The sound-absorbing plates 5 are made of microporous galvanized aluminum-magnesium plates 51 on both sides and sandwich rock wool plates 52 in the middle. The thickness of the sound-absorbing plates 5 is 50mm. When the airflow enters the sound-absorbing component 4 from the air inlet 2, the surface of the microporous galvanized aluminum-magnesium plates 51 can guide the airflow along the fixed channel to avoid secondary noise caused by airflow turbulence. The divided channels extend the airflow path and create conditions for subsequent rock wool sound absorption.

[0020] It should be noted that the shape of the sound-absorbing plate 5 is preferably a zigzag or wavy shape to increase the sound-absorbing area and improve the sound-absorbing effect.

[0021] The height of the silencing component 4 is not less than 2 / 3 of the height of the housing 1. The length of the silencing component 4 is calculated according to actual needs. An EPDM rubber sealing gasket is provided at the connection between the silencing component 4 and the air inlet 2 to improve the sealing performance. The housing 1 and the silencing component 4 are fixedly connected by bolts. When needed, the bolts can be removed to achieve combination and dispersion.

[0022] The composite sound-absorbing layer 6 is composed of a centrifugal glass wool board 601 and a polyurethane foam sound-absorbing board 602. The polyurethane foam sound-absorbing board 602 is close to the outer shell 2, and the centrifugal glass wool board 601 is close to the inner shell 1. The composite sound-absorbing layer 6 is also covered with a non-woven fabric covering layer 603. The thickness of the centrifugal glass wool board 601 is 50mm, and the thickness of the polyurethane foam sound-absorbing board 602 is 30mm. The centrifugal glass wool contains a large number of tiny pores. When mid-to-high frequency noise generated by airflow turbulence, such as the whistling sound of airflow hitting the inner shell 1, passes through, the noise sound waves drive the air molecules in the pores to move. The friction between molecules and the vibration damping of the fibers will convert the sound energy into sound energy. The sound is converted into a small amount of heat energy; the 50mm thickness design further extends the propagation path of sound waves in the pores, improving the sound absorption coefficient of mid-to-high frequency noise; at the same time, the centrifugal glass wool close to the inner shell 1 can preferentially absorb the near-field noise directly generated by the airflow, avoiding the energy amplification of noise after it penetrates to the outer layer; the polyurethane foam sound-absorbing board 602 close to the outer shell 2 achieves mid-to-low frequency sound absorption and suppresses structural vibration noise; the 30mm thick polyurethane foam can weaken mid-to-low frequency sound energy through the channel resonance effect, which just makes up for the shortness of centrifugal glass wool in the mid-to-low frequency range; the non-woven fabric covering layer 603 outside the composite sound-absorbing layer 6 is to prevent the fibers of the centrifugal glass wool from falling off.

[0023] The working principle of this utility model: When the ventilation system is started, the airflow enters the silencing component 4. Due to the several silencing plates 5 evenly arranged inside the silencing component 4, the airflow is divided into multiple independent air inlet channels. The airflow is evenly distributed and guided, avoiding excessive local flow velocity caused by the concentration of a single airflow. This ensures that the subsequent airflow can be evenly diffused into the interior of the chamber, improving the uniformity of static pressure distribution. At the same time, the microporous galvanized aluminum-magnesium plate 51 in the silencing plate 5 serves as the outer layer, guiding the airflow to flow smoothly along the channel. It also reflects some sound waves, causing the sound waves to repeatedly fold back and forth in the channel, extending their residence time in the silencing component. Finally, they are absorbed by the sandwich rock wool board 52, achieving noise reduction. After the airflow is processed by the silencing component 4, it enters the interior of the chamber 1. The internal space of the chamber 1 allows the airflow to be fully diffused, and the remaining dynamic pressure is continuously converted into static pressure, eliminating pressure fluctuations in the airflow. This ensures that the static pressure of the airflow discharged from the air outlet 3 on one side of the chamber 1 is uniform and the flow velocity is stable. Furthermore, the composite sound-absorbing layer 6 in the chamber 1 further absorbs the residual noise in the airflow.

[0024] The foregoing has provided a detailed description of one embodiment of the present invention, but the description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A combined duct silencer and static pressure device, comprising a housing (1), characterized in that, The enclosure (1) includes a detachable inner shell (101) and an outer shell (102). A sandwich cavity is formed between the inner shell (101) and the outer shell (102). The sandwich cavity is filled with a composite sound-absorbing layer (6). An air inlet (2) is provided at the bottom of the enclosure (1). An air outlet (3) is provided on one side of the enclosure (1). A sound-absorbing component (4) is fixedly connected to the bottom of the enclosure (1). The two ends of the sound-absorbing component (4) are open and connected to each other. One end is connected to the air inlet (2). A number of sound-absorbing plates (5) are evenly arranged inside the sound-absorbing component (4).

2. The combined duct silencer and static pressure device according to claim 1, characterized in that, The sound-absorbing plate (5) divides the interior of the sound-absorbing component (4) into multiple air inlet channels.

3. The combined duct silencer and static pressure device according to claim 1, characterized in that, The sound-absorbing sheet (5) includes microporous galvanized aluminum-magnesium plates (51) on both sides and a sandwich rock wool plate (52) in the middle.

4. The combined duct silencer and static pressure device according to claim 1, characterized in that, The thickness of the sound-absorbing sheet (5) is 50 mm.

5. A combined duct noise reduction and static pressure device according to claim 1, characterized in that, The composite sound-absorbing layer (6) is composed of a centrifugal glass wool board (601) and a polyurethane foam sound-absorbing board (602). The polyurethane foam sound-absorbing board (602) is located on the side closer to the outer shell (102), and the centrifugal glass wool board (601) is located on the side closer to the inner shell (101).

6. A combined duct noise reduction and static pressure device according to claim 5, characterized in that, The surface of the composite sound-absorbing layer (6) is covered with a non-woven fabric covering layer (603).

7. A combined duct noise reduction and static pressure device according to claim 5, characterized in that, The thickness of the centrifugal glass wool board (601) is 50mm; the thickness of the polyurethane foam sound-absorbing board (602) is 30mm.

8. A combined duct noise reduction and static pressure device according to claim 1, characterized in that, The height of the silencing component (4) is not less than 2 / 3 of the height of the housing (1).

9. A combined duct noise reduction and static pressure device according to claim 1, characterized in that, A EPDM rubber sealing gasket is provided at the connection between the noise reduction component (4) and the air inlet (2).

10. A combined duct noise reduction and static pressure device according to claim 1, characterized in that, The enclosure (1) and the sound-absorbing component (4) are detachable.

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