A labyrinth type sound absorbing return air chamber suitable for heating, ventilation and air conditioning system

Abstract

This utility model relates to a labyrinth-type anechoic return air chamber suitable for HVAC systems, comprising: an anechoic chamber with an air inlet and an air outlet; multiple sound-absorbing baffles are arranged on the inner wall of the anechoic chamber, and the multiple sound-absorbing baffles are staggered to form a labyrinth channel for airflow; the air inlet and the air outlet are respectively connected to the two ends of the labyrinth channel; wherein, an arc-shaped air guide plate connected to the inner wall of the anechoic chamber is provided at each corner of the labyrinth channel. This application uses multiple sound-absorbing baffles in the anechoic chamber to form a labyrinth channel. The tortuous path of the labyrinth channel causes noise waves to be reflected multiple times, thereby effectively reducing noise. Furthermore, the longer anechoic path of the labyrinth channel has a better noise reduction effect and a deceleration effect on the airflow. By setting the arc-shaped air guide plate, the airflow smoothly turns, reducing airflow pressure loss and reducing eddies generated at the turns of the labyrinth channel, thus reducing the noise generated by eddies and ensuring the noise reduction effect.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning noise reduction technology, specifically to a labyrinth-type sound-absorbing return air chamber suitable for HVAC systems. Background Technology

[0002] The demand for building energy conservation and improved indoor environmental quality is becoming increasingly urgent. In the design of HVAC supply air systems, professional sound absorption design is required at the return air vent to avoid significant airflow noise and transmitted equipment noise at the return air vent.

[0003] In the design of computer rooms for some projects, limitations such as floor height, pipeline layout, and structural load-bearing capacity sometimes make it difficult to implement traditional noise reduction solutions, such as lengthening air ducts or adding silencers and silencer elbows. When the air conditioning and ventilation system uses ductless return air or the return air duct is short, the industry generally uses "return air chambers" to replace traditional return air vents, achieving a noise reduction effect by increasing the cross-sectional area of ​​the airflow channel. Traditional return air chambers mostly adopt a straight-through structure, with a short noise reduction path and limited noise attenuation, resulting in poor noise reduction effect. Utility Model Content

[0004] Based on the above description, this utility model provides a labyrinth-type silencing return air chamber suitable for HVAC systems, in order to solve the problem that traditional return air chambers adopt a straight-through structure, with a short silencing path in the straight channel, resulting in limited noise attenuation and poor silencing effect.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: This application provides a labyrinth-type silencer return air chamber suitable for HVAC systems, and the technical solution adopted is as follows: A labyrinth-type silencer return air chamber suitable for HVAC systems, comprising: An anechoic chamber is provided with an air inlet and an air outlet. Multiple sound-absorbing baffles are installed on the inner wall of the anechoic chamber. The multiple sound-absorbing baffles are arranged in an alternating manner to form a labyrinth channel for airflow. The air inlet and the air outlet are respectively connected to the two ends of the labyrinth channel. Each corner of the maze passage is equipped with an arc-shaped air guide plate connected to the inner wall of the anechoic chamber.

[0006] Preferably, the arc-shaped air guide plate is elastically deformable, and in the airflow direction, the side of the arc-shaped air guide plate located upstream of the airflow is connected to the inner wall of the anechoic chamber, while the side located downstream of the airflow is free.

[0007] Preferably, the sound-absorbing baffle includes a connecting side connected to the inner wall of the anechoic chamber, and the side of the sound-absorbing baffle away from the connecting side has an outwardly convex arc surface.

[0008] Preferably, the inner wall of the anechoic chamber is provided with a sound-absorbing layer.

[0009] Preferably, a mesh panel is provided on the side of the sound-absorbing layer away from the inner wall of the anechoic chamber, and the mesh panel covers the sound-absorbing layer.

[0010] Preferably, both the air inlet and the air outlet are provided with louvers.

[0011] Preferably, the air inlet and the air outlet are respectively located on opposite side walls of the anechoic chamber, the opposite side walls are parallel to each other, and the air inlet and the air outlet are spaced apart in a first direction parallel to the opposite side walls. A plurality of sound-absorbing baffles are arranged on the opposite side walls and located between the air inlet and the air outlet in the first direction, and the plurality of sound-absorbing baffles are staggered in the first direction.

[0012] Compared with the prior art, the technical solution of this application has at least the following beneficial technical effects: 1. This application utilizes multiple sound-absorbing baffles installed within an anechoic chamber. These baffles are staggered to form a labyrinthine channel for airflow. The air inlet and outlet are connected to opposite ends of this labyrinthine channel. Airflow enters the anechoic chamber through the inlet, flows through the labyrinthine channel, and exits through the outlet. The tortuous path of the labyrinthine channel causes noise waves to undergo multiple reflections, resulting in energy attenuation and effectively reducing noise. Furthermore, the labyrinthine channel extends the airflow path, providing a longer anechoic path and thus achieving better noise reduction and airflow deceleration. The arc-shaped air guides at each corner of the labyrinthine channel ensure smooth airflow direction, reducing pressure loss and minimizing eddies at the turns, thereby reducing noise generated by eddies and ensuring effective noise reduction. Attached Figure Description

[0013] Figure 1 A schematic diagram of the structure of a labyrinth-type silencing return air chamber suitable for HVAC systems provided in this embodiment of the utility model; Figure 2 Figure 1 An enlarged schematic diagram of region A in the middle.

[0014] Explanation of reference numerals in the attached figures: 1. Silencing chamber; 11. Air inlet; 12. Air outlet; 2. Sound-absorbing baffle; 3. Curved air guide plate; 4. Sound-absorbing layer; 5. Mesh layer; 6. Wire mesh. Detailed Implementation

[0015] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0017] It is understood that spatial relation terms such as "below," "under," "below," "below," "above," "above," etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as "below" or "below" of the other element or feature will be oriented "above" the other element or feature. Therefore, the exemplary terms "below" and "below" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0018] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0019] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0020] Reference Figure 1As shown, this application embodiment provides a labyrinth-type silencing return air chamber suitable for HVAC systems, including a silencing chamber 1 with an air inlet 11 and an air outlet 12. Multiple sound-absorbing baffles 2 are provided on the inner wall of the silencing chamber 1. The multiple sound-absorbing baffles 2 are staggered to form a labyrinth channel for airflow. The air inlet 11 and the air outlet 12 are respectively connected to the two ends of the labyrinth channel.

[0021] Airflow enters the anechoic chamber 1 through the air inlet 11, flows through the labyrinth channel, and then flows out through the air outlet 12. The tortuous path of the labyrinth channel causes the noise sound waves to be reflected multiple times, and the noise sound waves are attenuated after multiple reflections, thus effectively reducing noise. In addition, the labyrinth channel extends the airflow path and has a longer anechoic path, thus having a better noise reduction effect and a deceleration effect on the airflow.

[0022] Specifically, louvers are provided in both the air inlet 11 and the air outlet 12. However, the louvers in the air outlet 12 can be omitted to allow direct connection to the air conditioning duct.

[0023] Reference Figure 1 As shown, the air inlet 11 and the air outlet 12 are respectively located on opposite side walls of the anechoic chamber 1. The opposite side walls are parallel to each other, and the air inlet 11 and the air outlet 12 are spaced apart in a first direction parallel to the opposite side walls. Multiple sound-absorbing baffles 2 are arranged on the opposite side walls and are located between the air inlet 11 and the air outlet 12 in the first direction. The multiple sound-absorbing baffles 2 are staggered in the first direction.

[0024] Reference Figure 1 As shown, specifically in this embodiment, the anechoic chamber 1 is illustrated as a cuboid, with the air inlet 11 and air outlet 12 respectively located on opposite side walls of the anechoic chamber 1. The sound-absorbing baffle 2 is configured perpendicular to the side wall where the air inlet 11 is located, and is perpendicular to the first direction. The sound-absorbing baffle 2 includes a connecting side that connects to the inner wall of the anechoic chamber 1, which is fixed to the inner wall, while the other side is suspended. In a direction perpendicular to the first direction and parallel to the side wall of the anechoic chamber 1 where the sound-absorbing baffle 2 is located, both ends of the sound-absorbing baffle 2 extend to abut against the other two side walls of the anechoic chamber 1, thus allowing airflow to only circulate along the labyrinthine passage. This embodiment illustrates the use of one sound-absorbing baffle 2 on each of the opposite side walls of the anechoic chamber 1. In actual design, an appropriate number of sound-absorbing baffles 2 can be set according to the size of the anechoic chamber 1 and the anechoic requirements.

[0025] Reference Figure 1-2As shown, to further improve the noise reduction effect, a sound-absorbing layer 4 is provided on the inner wall of the anechoic chamber 1, and a mesh plate layer 5 covering the sound-absorbing layer 4 is provided on the inner wall of the anechoic chamber 1. The sound-absorbing layer 4 is made of centrifugal glass wool, and the mesh plate layer 5 is made of aluminum mesh. During installation, a layer of wire mesh 6 is first laid on the inner wall of the anechoic chamber 1, then the centrifugal glass wool is laid on the wire mesh 6, and finally the aluminum mesh plate is covered on the centrifugal glass wool. The aluminum mesh plate is then fixed to the inner wall of the anechoic chamber 1 with bolts.

[0026] Reference Figure 1 As shown, furthermore, an arc-shaped air guide plate 3 connected to the inner wall of the anechoic chamber 1 is installed at each corner of the maze passage. This arrangement ensures that the airflow flows along the arc of the arc-shaped air guide plate 3 each time it turns, allowing the airflow to turn smoothly. This reduces the eddies generated by the airflow at the turns of the maze passage, thereby reducing the noise generated by the eddies and ensuring the noise reduction effect.

[0027] In this embodiment, the axis of the arc-shaped air guide plate 3 is parallel to the side wall where the air inlet 11 is located and perpendicular to the first direction. The maze passage has four turns; therefore, four arc-shaped air guide plates 3 are provided.

[0028] Reference Figure 1 As shown, furthermore, the side of the sound-absorbing baffle 2 away from the connection side is made into a convex arc surface. This arrangement can also reduce the vortices generated on the side of the sound-absorbing baffle 2 away from the connection side when the airflow turns.

[0029] Reference Figure 1 As shown, the arc-shaped air guide plate 3 is further configured to be elastically deformable. In the airflow direction, the side of the arc-shaped air guide plate 3 upstream of the airflow is connected to the inner wall of the anechoic chamber 1, while the side downstream of the airflow is free. Specifically, the side of the arc-shaped air guide plate 3 connected to the inner wall of the anechoic chamber 1 is fixed to the inner wall of the anechoic chamber 1 by bolts. Specifically, the arc-shaped air guide plate 3 is connected to the mesh layer 5, and the bolts pass through the arc-shaped air guide plate 3, the mesh layer 5, and the sound-absorbing layer 4 to connect to the inner wall of the anechoic chamber 1. The other side of the arc-shaped air guide plate 3 is spaced apart from the inner wall of the anechoic chamber 1, providing space for the deformation of the arc-shaped air guide plate 3 and preventing collisions.

[0030] When airflow passes through, it impacts the arc-shaped air guide plate 3 when turning at a corner. Under the influence of the airflow, the arc-shaped air guide plate 3 elastically deforms, dynamically adjusting its cross-sectional area to adapt to the airflow. This ensures a stable output airflow from the anechoic chamber 1 even when there are significant fluctuations in the input airflow. Simultaneously, the elastic deformation of the arc-shaped air guide plate 3 allows it to vibrate elastically, absorbing noise energy and further improving the noise reduction effect.

[0031] In this embodiment, the arc-shaped air guide plate 3 is made of plastic sheet. Depending on actual needs, an angle steel bracket can be installed between the sound-absorbing baffle 2 and the inner wall of the anechoic chamber 1 to reinforce the sound-absorbing baffle 2.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A labyrinth-type silencer return air chamber suitable for HVAC systems, characterized in that, include: An anechoic chamber (1) is provided with an air inlet (11) and an air outlet (12). Multiple sound-absorbing baffles (2) are provided on the inner wall of the anechoic chamber (1). The multiple sound-absorbing baffles (2) are staggered to form a maze channel for airflow. The air inlet (11) and the air outlet (12) are respectively connected to the two ends of the maze channel. Each corner of the maze passage is equipped with an arc-shaped air guide plate (3) connected to the inner wall of the anechoic chamber (1).

2. The labyrinth-type silencer return air chamber for HVAC systems according to claim 1, characterized in that: The arc-shaped air guide plate (3) is elastically deformable, and in the airflow direction, the side of the arc-shaped air guide plate (3) located upstream of the airflow is connected to the inner wall of the anechoic chamber (1), while the side located downstream of the airflow is free.

3. The labyrinth-type silencer return air chamber for HVAC systems according to claim 1, characterized in that: The sound-absorbing baffle (2) includes a connecting side connected to the inner wall of the anechoic chamber (1), and the side of the sound-absorbing baffle (2) away from the connecting side is an outwardly convex arc surface.

4. The labyrinth-type silencer return air chamber for HVAC systems according to claim 1, characterized in that: The inner wall of the anechoic chamber (1) is provided with a sound-absorbing layer (4).

5. The labyrinth-type silencer return air chamber for HVAC systems according to claim 4, characterized in that: The inner wall of the anechoic chamber (1) is provided with a mesh plate layer (5) covering the sound-absorbing layer (4).

6. The labyrinth-type silencer return air chamber for HVAC systems according to claim 1, characterized in that: Both the air inlet (11) and the air outlet (12) are equipped with louvers.

7. The labyrinth-type silencer return air chamber for HVAC systems according to claim 1, characterized in that: The air inlet (11) and the air outlet (12) are respectively located on opposite side walls of the anechoic chamber (1). The opposite side walls are parallel to each other, and the air inlet (11) and the air outlet (12) are spaced apart in a first direction parallel to the opposite side walls. A plurality of sound-absorbing baffles (2) are arranged on the opposite side walls and located between the air inlet (11) and the air outlet (12) in the first direction. The plurality of sound-absorbing baffles (2) are staggered in the first direction.

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