Ventilation silencer for air conditioning unit based on water-drop-shaped insertion pieces

Abstract

The invention discloses a water-drop-shaped silencing sheet-based ventilation silencer with low-frequency traps for an air conditioning unit, the water-drop-shaped silencing sheet-based ventilation silencer comprises a ventilation silencer shell, a water-drop-shaped silencing sheet is fixed in the ventilation silencer shell, and sound absorption cotton is distributed at four corners in the ventilation silencer shell to serve as the low-frequency traps. A sound absorption cotton assembly is arranged in the ventilation silencer shell and comprises a U-shaped keel, a galvanized perforated plate and sound absorption cotton. The water-drop-shaped silencing sheet adopts the water-drop-shaped galvanized perforated plate, compared with a rectangular silencing sheet, the escape speed of airflow at the tail end of the water-drop-shaped silencing sheet is high, and the ventilation effect is better. Compared with a traditional silencer, the low-frequency trap has the advantage that the silencing effect on low-frequency noise is excellent. The surface of the ventilation silencer shell is directly coated with the fireproof heat insulation composite board, and the fireproof heat insulation composite board is riveted with the galvanized four-corner protection corners through the rivets, so that the composite board and the silencer are integrated, the silencer can be directly installed when installed, and the construction efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ventilation silencers, in particular to a ventilation silencer for air conditioning units based on water droplet-shaped inserts. BACKGROUND

[0002] During the operation of the air conditioning unit, the ventilation system will produce certain noise. According to the latest promulgated GB 55038-2025 residential project specification for sound environment requirements, the air conditioning unit seriously affects the comfort of the living environment, so a ventilation silencer is needed to reduce noise.

[0003] According to the introduction of the ventilation silencer in GB / T 41318-2022, the sound-absorbing inserts of the sheet-type silencer are mostly rectangular structures, which have poor ventilation effect, high wind resistance, and large energy loss.

[0004] At the same time, the existing ventilation silencers do not take into account the problem that low-frequency transmission loss in the pipeline is extremely low and difficult to handle. Low-frequency noise is more annoying to people and has a greater impact on the human body.

[0005] In addition, some existing ventilation silencers also have deficiencies in fireproof and heat insulation performance, and are difficult to meet the use requirements of some special occasions. SUMMARY

[0006] The purpose of the present application is to provide a ventilation silencer for air conditioning units based on water droplet-shaped inserts to solve the problems raised in the background art.

[0007] To achieve the above purpose, the present application provides the following technical scheme: a ventilation silencer for air conditioning units based on water droplet-shaped inserts, comprising a ventilation silencer shell, a water droplet-shaped sound-absorbing insert is fixed in the ventilation silencer shell, sound-absorbing cotton assemblies are arranged at both ends of the ventilation silencer shell, the sound-absorbing cotton assembly comprises a U-shaped keel, sound-absorbing cotton and a galvanized perforated plate, the sound-absorbing cotton is arranged at the four corners of the ventilation silencer shell, and the sound-absorbing cotton is installed on the U-shaped keel, the sound-absorbing cotton is covered and fixed with a galvanized perforated plate on one side, the front of the ventilation silencer shell is provided with an air inlet, the back of the ventilation silencer shell is provided with an air outlet, the side of the ventilation silencer shell is provided with a galvanized four-corner angle bead, the surface of the ventilation silencer shell is covered with a fireproof and heat insulation composite board, and the fireproof and heat insulation composite board is riveted with the galvanized four-corner angle bead through rivets.

[0008] The ventilation silencer is connected and fixed with the ventilation pipeline of the air conditioning unit through the connecting flanges on the air inlet and the air outlet. The airflow containing noise generated by the air conditioning unit enters the ventilation silencer shell from the air inlet, and the airflow first flows through the galvanized perforated plate into the sound absorbing cotton. Another part of the airflow flows out through the airflow channel due to the water droplet-shaped diversion effect of the water droplet-shaped silencing sheet. The water droplet-shaped silencing sheet functions to allow the airflow to better enter the low-frequency traps and the sound absorbing cotton assembly on both sides. The water droplet-shaped galvanized perforated plate increases the contact area with the front airflow. Due to the design of the water droplet shape, the tail airflow escapes quickly, has less turbulent flow, less aerodynamic noise, and good ventilation performance. The sound waves in the airflow enter the interior of the water droplet-shaped silencing sheet through the through holes, are absorbed and weakened by the non-woven fabric layer and the glass fiber cotton layer, and the treated airflow is discharged from the air outlet. The non-woven fabric is an inner lining of the galvanized perforated plate, which prevents the sound absorbing cotton from being blown away. The fireproof and heat insulation composite board on the surface of the ventilation silencer shell functions to resist fire and insulation. The galvanized four-corner angle bead protects the side of the ventilation silencer shell.

[0009] Preferably, the water droplet-shaped silencing sheet comprises a galvanized perforated plate, a non-woven fabric layer and a glass fiber cotton layer. The galvanized perforated plate is in a water droplet shape, the inner wall of the galvanized perforated plate is provided with a non-woven fabric layer, and the non-woven fabric layer is internally provided with a glass fiber cotton layer. The galvanized perforated plate adopts a water droplet-shaped structure design, which reduces wind resistance and total pressure loss compared with a traditional rectangular structure, reduces speed accumulation, reduces aerodynamic noise, and allows the airflow to pass through the airflow channel smoothly. At the same time, the perforated design on the surface of the galvanized perforated plate allows sound waves to enter the interior of the water droplet-shaped silencing sheet through the small holes and interact with the internal materials to achieve sound wave attenuation. The non-woven fabric layer is located on the inner wall of the galvanized perforated plate, which functions to fix and protect the glass fiber cotton layer and prevent the glass fiber cotton from falling off. On the other hand, the porous structure of the non-woven fabric layer has a certain absorption and buffering effect on sound waves, which can preliminarily weaken the sound wave energy. The glass fiber cotton layer, as the main sound absorbing material, has a large number of micro pores and inter-fiber gaps inside. When sound waves enter the glass fiber cotton layer, they are continuously reflected and refracted in the pores and gaps, rub against the fibers, convert sound energy into heat energy, and dissipate, thereby achieving high-efficiency sound attenuation.

[0010] Preferably, a plurality of through holes are uniformly arranged on the surface of the galvanized perforated plate, the diameter of the through holes is 3mm, and the hole distance between the through holes is 3mm.

[0011] Preferably, the thickness of the non-woven fabric layer is 0.16mm, and the thickness of the glass fiber cotton layer is 100mm.

[0012] Preferably, the air inlet and the air outlet are both provided with connecting flanges.

[0013] Compared with the prior art, the ventilation silencer has the following advantages:

[0014] The water-drop-shaped sound-absorbing piece in the application adopts a water-drop-shaped structure of a galvanized perforated plate, compared with a traditional rectangular sound-absorbing piece, the sound-absorbing effect meets the standard, and the effect of ventilation and flow guide is better; the low-frequency trap makes the sound-absorbing effect of low-frequency noise of the application excellent compared with a traditional sound absorber. The fireproof and heat-insulating composite board is directly coated on the surface of the ventilation sound absorber shell, and is riveted with the galvanized four-corner angle bead, so that the composite board is integrated with the sound absorber, the sound absorber can be directly installed when the sound absorber is installed, the construction process is reduced, and the construction efficiency is improved. The setting of the fireproof and heat-insulating composite board enhances the fireproof and heat-insulating performance of the sound absorber, and expands the application range. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic diagram of the application;

[0016] Figure 2 is a top view sectional view of the application;

[0017] Figure 3 is a partial enlarged view of A in the application; Figure 2

[0018] Figure 4 is a schematic diagram of the internal partial structure of the application;

[0019] Figure 5 is a partial sectional view of the water-drop-shaped sound-absorbing piece of the application.

[0020] In the figure: 1, ventilation sound absorber shell; 2, water-drop-shaped sound-absorbing long piece; 3, air outlet; 4, connecting flange; 5, galvanized four-corner angle bead; 6, fireproof and heat-insulating composite board; 7, air inlet; 8, water-drop-shaped sound-absorbing short piece; 9, low-frequency trap; 10, U-shaped keel; 11, sound-absorbing cotton; 12, galvanized perforated plate; 13, through hole; 14, non-woven fabric layer; 15, glass fiber cotton layer. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application.

[0022] Please refer to Figures 1-5 ​The application provides a ventilation silencer for an air conditioning unit based on water-drop-shaped inserts, wherein a water-drop-shaped silencer insert 2 and 8 are fixed in a ventilation silencer shell 1, U-shaped keels 10 are arranged at both ends of the ventilation silencer shell 1, sound-absorbing cotton 11 is arranged on the U-shaped keels 10, low-frequency traps 9 are arranged at four corners of the ventilation silencer shell 1 in a trapezoidal manner, an air inlet 7 is arranged on the front surface of the ventilation silencer shell 1, an air outlet 3 is arranged on the back surface of the ventilation silencer shell 1, galvanized four-corner angle beads 5 are arranged on the side surfaces of the ventilation silencer shell 1, and fireproof and heat-insulating composite boards 6 are arranged on the surfaces of the ventilation silencer shell 1 and are riveted with the galvanized four-corner angle beads 5 through rivets.

[0023] The water-drop-shaped silencer inserts 2 and 8 each comprise a galvanized perforated plate 12, a non-woven fabric layer 14 and a glass fiber cotton layer 15, the galvanized perforated plate 12 has a water-drop-shaped structure, the inner wall of the galvanized perforated plate 12 is provided with the non-woven fabric layer 14, and the non-woven fabric layer 14 is provided with the glass fiber cotton layer 15.

[0024] Specifically, the galvanized perforated plate 12 has a water-drop-shaped structure, compared with a traditional rectangular structure, can reduce the inlet and along-the-way wind resistance and total pressure loss, reduce speed accumulation, reduce aerodynamic noise and make the airflow pass through gently. Meanwhile, the perforation design on the surface of the galvanized perforated plate 12 enables sound waves to enter the inside of the silencer insert through the small holes and interact with the internal material to realize sound wave attenuation. The non-woven fabric layer 14 is arranged on the inner wall of the galvanized perforated plate 12, on one hand, plays a role in fixing and protecting the glass fiber cotton layer 15 and prevents the glass fiber cotton from falling off, and on the other hand, has a certain absorption and buffering effect on sound waves and can preliminarily weaken the sound wave energy. The glass fiber cotton layer 15 serves as the main sound-absorbing material, a large number of micro pores and inter-fiber gaps exist in the glass fiber cotton layer 15, when sound waves enter the glass fiber cotton layer, the sound waves are continuously reflected and refracted in the pores and gaps and rub against the fibers to convert sound energy into heat energy and dissipate, so that the purpose of high-efficiency sound attenuation is achieved.

[0025] A plurality of through holes 13 are uniformly arranged on the surface of the galvanized perforated plate 12, the diameter of the through holes 13 is 3 mm, and the hole distance between the through holes 13 is 3 mm.

[0026] The thickness of the non-woven fabric layer 14 is 0.16 mm, and the thickness of the glass fiber cotton layer 15 is 100 mm.

[0027] The air inlet 7 and the air outlet 3 are each provided with a connecting flange 4.

[0028] Specifically, the connecting flange 4 adopts a bolt fastening structure, can be precisely connected with the air duct, fan duct and other components of the air conditioning unit, forms a closed airflow transmission channel, and effectively prevents the noise reduction performance from being attenuated due to air leakage. At the same time, the rigid support function of the connecting flange can disperse the pipeline stress, avoid reducing the service life of the silencer due to vibration transmission, and ensure that the airflow passes through the water droplet-shaped insert structure inside the silencer smoothly, providing stable airflow dynamic conditions for the subsequent sound wave interference, impedance conversion and other noise reduction processes.

[0029] Working principle, in use, the silencer is connected and fixed with the ventilation duct of the air conditioning unit through the connecting flanges 4 on the air inlet 7 and the air outlet 3. The airflow containing noise generated by the air conditioning unit enters the ventilation silencer shell 1 from the air inlet 3, the airflow first passes through the sound absorbing cotton assembly, and the sound absorbing cotton 11 absorbs part of the noise. Then the airflow flows through the water droplet-shaped silencer sheet 2 and 8, the galvanized perforated plate 12 with water droplet-shaped structure increases the contact area with the airflow, and the sound waves in the airflow enter the inside of the water droplet-shaped silencer sheet through the through hole 13, are absorbed and weakened by the non-woven fabric layer 14 and the glass fiber cotton layer 15, and the treated airflow is discharged from the air outlet 7. The fireproof and heat insulation composite board 6 on the surface of the ventilation silencer shell 1 plays a role of fireproof and heat insulation, and the galvanized four-corner angle bead 5 plays a protective role for the side of the ventilation silencer shell 1.

[0030] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A ventilation muffler for an air conditioning unit based on a water-drop-shaped insert, comprising a ventilation muffler housing (1), characterized in that, The water drop-shaped sound-absorbing piece (2) and (8) are fixed in the ventilation muffler shell (1), both ends of the ventilation muffler shell (1) are provided with U-shaped keels (10), the U-shaped keels (10) are provided with sound-absorbing cotton (11), four corners of the ventilation muffler shell (1) are provided with low-frequency traps (9) arranged in a trapezoidal shape, the front surface of the ventilation muffler shell (1) is provided with an air inlet (7), the back surface of the ventilation muffler shell (1) is provided with an air outlet (3), the side surfaces of the ventilation muffler shell (1) are provided with galvanized four-corner angle guards (5), the surface of the ventilation muffler shell (1) is covered with a fire-resistant and heat-insulating composite board (6), and the fire-resistant and heat-insulating composite board (6) is riveted with the galvanized four-corner angle guards (5) through rivets.

2. The water-drop-shaped insert-based ventilation silencer for an air conditioning unit according to claim 1, characterized in that: The water drop-shaped sound-absorbing piece (2) and (8) are not the same in length, and the water drop-shaped sound-absorbing short piece (8) is fixed on both sides of the ventilation muffler shell (1) close to the low-frequency trap (9).

3. The water-drop-shaped insert-based ventilation silencer for an air conditioning unit according to claim 1, characterized in that: The water drop-shaped sound-absorbing piece (2) and (8) each include a galvanized perforated plate (12), a non-woven fabric layer (14) and a glass fiber cotton layer (15), the galvanized perforated plate (12) is in a water drop-shaped structure, the inner wall of the galvanized perforated plate (12) is provided with the non-woven fabric layer (14), and the non-woven fabric layer (14) is provided with the glass fiber cotton layer (15) therein.

4. The water-drop-shaped insert-based ventilation silencer for an air conditioning unit according to claim 1, characterized in that: A plurality of through holes (13) are uniformly arranged on the surface of the galvanized perforated plate (12), the diameter of the through holes (13) is 3 mm, and the hole spacing between the through holes (13) is 3 mm.

5. The water-drop-shaped insert-based vent silencer for an air conditioning unit according to claim 1, characterized in that: The thickness of the non-woven fabric layer (14) is 0.16 mm, and the thickness of the glass fiber cotton layer (15) is 100 mm.

6. The water-drop-shaped insert-based vent silencer for an air conditioning unit according to claim 1, characterized in that: The air inlet (7) and the air outlet (3) are each provided with a connecting flange (4).

Images