All-air system air return pipe silencer and all-air system air return pipe

Abstract

An all-air system air return pipe silencer and an all-air system air return pipe are characterized in that the all-air system air return pipe silencer at least comprises an air inlet silencing module, the air inlet silencing module comprises a first shell, and the first shell forms a first inner cavity penetrating front and back; the plurality of first partitions divide the first inner cavity into at least one first silencing cavity which is communicated in the penetrating direction of the first inner cavity; the first partition is a plate which is locally or wholly provided with ventilation holes and has certain supporting strength; and an air outlet silencing module is further arranged. An air inlet silencing module is arranged in an air inlet of the air return pipe, and an air outlet silencing module is arranged in an air outlet of the air return pipe. According to the patent, the silencing device is modularly designed and can be directly integrated into the air return pipe or installed as a modular assembly, and installation is very convenient and fast; and a high-performance material is selected, so that good corrosion resistance and long-term stability are achieved.

Description

Technical Field

[0001] This invention relates to the field of all-air products, and more particularly to an all-air system return air duct silencer and an all-air system return air duct. Background Technology

[0002] As a high-end air conditioning system, the all-air system regulates indoor temperature, humidity, fresh air, exhaust air, purification, and disinfection through high air volume. However, during high-air volume operation, the return air duct can become a path for noise propagation, especially the mechanical noise generated by the indoor unit, which can easily spread to other areas of the room, affecting the comfort of users' living or working environment. Currently, there is a lack of efficient and easy-to-install return air duct noise reduction devices.

[0003] As a highly customized product, all-air silencing devices require different installation methods and return air duct locations and sizes depending on the specific characteristics of the home layout, load-bearing walls, main beams, and secondary beams. Consequently, the resulting noise frequency bands and loudness will also vary. To flexibly address the noise reduction needs of different households, a new, more flexible sound-absorbing device needs to be designed. Summary of the Invention

[0004] The present invention aims to solve the existing problems and provide a modular return air duct silencing device with good silencing effect and easy installation; and a return air duct for an all-air system with good silencing effect.

[0005] To achieve the objectives of this invention, a silencer for a return air duct of an all-air system is disclosed, comprising at least one air inlet silencer module. The air inlet silencer module includes a first outer shell, which forms a first inner cavity extending from front to back. A plurality of first partitions divide the first inner cavity into at least one first silencer chamber that is open along the through direction of the first inner cavity. The first partitions are plates with ventilation holes and a certain supporting strength, either partially or entirely. The air inlet silencer module is built into the air inlet of the return air duct. The shape of the first outer shell matches the shape of the corresponding air inlet of the return air duct, and the first inner cavity extending from front to back is consistent with the air inlet direction of the return air duct.

[0006] Furthermore, a second partition is combined with the two side walls of the first inner cavity to form a second silencing cavity. Specifically, the second partition extends vertically along the penetrating direction of the first inner cavity, and the front end of the second partition is tightly fitted with the side wall to form an air inlet end face. The air inlet end face does not have ventilation holes, so as to block and guide the airflow when air is introduced, thereby reducing wind noise.

[0007] Furthermore, at the air inlet port of the air inlet silencing module, the front end of the air inlet of each first silencing chamber forms a closed air inlet end face. The air inlet end face does not have ventilation holes, which is used to block and guide the airflow during air intake to reduce wind noise; the air inlet end face is arc-shaped.

[0008] Furthermore, there is an additional air outlet silencing module, which includes a second outer shell forming a second inner cavity that extends from front to back. Several third partitions divide the second inner cavity into at least one third silencing chamber that is open along the through direction of the second inner cavity. The third partition is a plate with dense ventilation holes and a certain supporting strength. The air outlet silencing module is built into the air outlet end of the return air duct. The shape of the second outer shell matches the shape of the corresponding air outlet end of the return air duct, and the second inner cavity that extends from front to back is consistent with the air outlet direction of the return air duct.

[0009] Furthermore, a fourth partition is combined with the two side walls of the second inner cavity to form a fourth silencing cavity. Specifically, the fourth partition extends vertically and along the penetrating direction of the second inner cavity. The front end of the fourth partition is closely fitted with the side wall to form an air outlet end face, which has dense ventilation holes. The air outlet end face is arc-shaped, and the arc shape is guided in the penetrating direction of the second inner cavity.

[0010] Furthermore, at the air outlet port of the air outlet silencing module, the rear end of each third silencing cavity forms an air outlet end face, which has dense ventilation holes; the air outlet end face is arc-shaped.

[0011] Furthermore, the front end and / or rear end of the first housing and / or the second housing are provided with peripheral flanges, and the peripheral flanges are provided with a plurality of mounting holes, so as to assemble the air inlet silencing module and the air outlet silencing module into the air inlet and air outlet of the return air duct, respectively.

[0012] Furthermore, both the first and second outer shells are equipped with guide structures at their bottoms to facilitate quick push-in installation.

[0013] Furthermore, the panels of the first and second partitions are made of materials with high sound absorption coefficients.

[0014] A return air duct for an all-air system, wherein the air inlet of the return air duct has the aforementioned air inlet silencer module built in; and the air outlet of the return air duct has the aforementioned air outlet silencer module built in.

[0015] The silencing device described in this patent has a structure that ensures smooth airflow, especially since all partitions have sufficiently dense ventilation holes, allowing airflow to pass freely and avoiding significant resistance to the system's air volume; it also significantly reduces noise, particularly with excellent absorption of mid-to-high frequency noise.

[0016] Furthermore, our patent features a modular design for the silencing device, with a very compact structure for both the inlet and outlet silencing modules. These modules can be directly integrated into the return air duct or added as modular components, making installation very convenient. In addition, the use of high-performance materials provides excellent corrosion resistance and long-term stability.

[0017] This invention successfully suppresses the propagation of indoor unit noise by adding a silencer to the return air duct of an all-air system, meeting the low-noise operation requirements of modern HVAC systems. The device is easy to install, has stable performance, and possesses broad practical application value and market prospects. Attached Figure Description

[0018] The specific description given as a non-limiting example better explains what the invention includes and how it can be practiced. Furthermore, this description refers to the accompanying drawings, in which:

[0019] Figure 1 The air intake silencer module described in this embodiment of the invention;

[0020] Figure 2 The air outlet silencing module described in the embodiments of the present invention;

[0021] Figure 3 This is a schematic cross-sectional view of the air intake silencer module described in an embodiment of the present invention;

[0022] Figure 4 This is a schematic cross-sectional view of the air outlet silencer module described in an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the air inlet assembly of the return air duct according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the air outlet assembly of the return air duct according to an embodiment of the present invention;

[0025] Figure 7 for Figure 5 A magnified view of a portion of the image.

[0026] Label Explanation

[0027] 1. Air inlet silencer module; 11. First outer shell; 12. First inner cavity; 131. First partition; 1310. Ventilation hole; 1311. Air inlet end face; 132. Second partition; 14. First silencer cavity; 15. Second silencer cavity; 2. Air outlet silencer module; 21. Second outer shell; 22. Second inner cavity; 231. Third partition; 2310. Air outlet end face; 232. Fourth partition; 24. Third silencer cavity; 25. Fourth silencer cavity; 3. Peripheral flange; 31. Assembly hole; 4. Guide rail; 51. Air inlet; 52. Air outlet. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1-4 As shown, a silencer for the return air duct of an all-air system includes an air inlet silencer module 1 and an air outlet silencer module 2.

[0030] The air intake silencing module 1 includes a first outer shell 11, which forms a first inner cavity 12 that extends from front to back. Two first partitions 131 divide the first inner cavity 12 into a first silencing cavity 14 that is open along the through direction of the first inner cavity 12. At the air intake port of the air intake silencing module 1, the front end of the first silencing cavity 14 forms a closed air intake end face 1311.

[0031] like Figure 3 As shown, there are two additional second partitions 132 that are combined with the two side walls of the first inner cavity 12 to form a second silencing cavity 15. Specifically, the second partition 132 extends vertically and along the penetrating direction of the first inner cavity 12, and the front end of the second partition 132 is tightly fitted with the side wall to form an air inlet end face 1311.

[0032] The air inlet end face 1311 does not have a ventilation hole 1310 and is arc-shaped. The arc shape guides the direction of the first inner cavity 12 through, so as to block and guide the airflow when the air is inlet, thereby reducing wind noise.

[0033] The first partition 131 and the second partition 132 are board materials with certain supporting strength, which are partially or entirely equipped with ventilation holes 1310. In this embodiment, the portions of the first partition 131 and the second partition 132 located on the air inlet end face 1311 do not have ventilation holes 1310, while other portions have dense ventilation holes 1310, such as... Figure 1 , 3 As shown, it is used to block and guide the airflow during air intake, thereby reducing wind noise.

[0034] like Figure 5 As shown, the air intake silencing module 1 is built into the air inlet 51 of the return air duct. The shape of the first outer shell 11 matches the shape of the corresponding air inlet 51 of the return air duct, and the first inner cavity 12 that runs through the front and back is consistent with the air intake direction of the return air duct.

[0035] like Figure 2 , 4 As shown, the air outlet silencing module 2 includes a second outer shell 21, which forms a second inner cavity 22 that extends from front to back. Two third partitions 231 divide the second inner cavity 22 into a third silencing cavity 24 that extends along the through direction of the second inner cavity 22. At the air outlet port of the air outlet silencing module 2, the rear end of the third silencing cavity 24 forms an air outlet end face 2310.

[0036] Two additional fourth partitions 232 are combined with the two side walls of the second inner cavity 22 to form a fourth silencing cavity 25. Specifically, the fourth partitions 232 extend vertically and along the penetrating direction of the second inner cavity 22, and the front end of the fourth partitions 232 is attached to the side wall to form an air outlet end face 2310.

[0037] Unlike the air inlet end face 1311, the air outlet end face 2310 has dense ventilation holes 1310 and the air outlet end face 2310 is arc-shaped, and the arc shape guides the second inner cavity 22 through direction.

[0038] The third partition 231 and the fourth partition 232 are integrally formed panels with dense ventilation holes 1310 and a certain supporting strength, such as... Figure 2 , 4 As shown, the air in the return air duct is allowed to be discharged outward from the third and fourth silencing chambers 25 and the second inner chamber 22, and the airflow noise is greatly reduced due to the direct penetration of the dense ventilation holes 1310 in the third and fourth silencing chambers 25.

[0039] like Figure 5 , 6 As shown, the exhaust silencer module 2 is built into the exhaust outlet 52 of the return air duct. The shape of the second outer shell 21 matches the shape of the exhaust outlet 52 of the corresponding return air duct, and the second inner cavity 22 that runs through the front and back is consistent with the exhaust direction of the return air duct.

[0040] In this embodiment, the front and rear ends of the first outer shell 11 and the second outer shell 21 are provided with peripheral flanges 3. The peripheral flanges 3 are provided with a plurality of mounting holes 31, and the air inlet silencing module 1 and the air outlet silencing module 2 are assembled into the air inlet 51 and the air outlet 52 of the return air duct by screws or bolts.

[0041] like Figure 5-6 As shown, in this embodiment, the bottom of both the first outer shell 11 and the second outer shell 21 is provided with a guide structure, specifically a guide rail 4, which is used to quickly push in and fix the air inlet silencing module 1 and the air outlet silencing module 2 into the air inlet 51 and the air outlet 52 of the return air duct, respectively.

[0042] The panels of the first partition 131, the second partition 132, the third partition 231, and the fourth partition 232 are made of materials with high sound absorption coefficients, typically fiberglass boards, microporous metal boards, or PET film boards. These materials meet the requirement of having dense pores while providing sufficient support strength. (See reference...) Figure 7Schematic diagram of the dense ventilation holes 1310; Since the partition also has a certain supporting strength, in practical applications, it also provides a certain supporting effect on the upper and lower inner walls of the air inlet silencing module 1 and the air outlet silencing module 2, so as to maintain the stability of air circulation in the silencing device (return air duct).

[0043] like Figure 5-6 As shown, a return air duct for an all-air system has an inlet 51 and an outlet 52 with an inlet structure (not shown in the figure) at the bottom of which guides the guide rails 4 at the bottom of the first housing 11 and the second housing 21. This facilitates the quick insertion and installation of the inlet silencer module 1 and the outlet silencer module 2 into the inlet 51 and the outlet 52.

[0044] The first outer shell 11 and the second outer shell 21 are generally made of gold-plated metal, which protects the sound-absorbing material while also providing sound insulation, achieving excellent durability.

[0045] This patent forms multiple silencing chambers within the return air duct, including a first silencing chamber 14, a second silencing chamber 15, a third silencing chamber 24, and a fourth silencing chamber 25. In practical applications, the shape of each silencing chamber can be adjusted by designing different forms and styles of the first partition 131, the second partition 132, the third partition 231, and the fourth partition 232. Different frequency band noise can be absorbed and attenuated through specific geometric designs (e.g., designed as expansion chambers or damping chambers).

[0046] In practical applications, when the mechanical noise generated by the indoor unit enters the return air duct and passes through the silencer of this patent, the sound fluctuations are absorbed by the sound-absorbing material and the energy is converted into heat energy. Some high-frequency and low-frequency noises are further attenuated through the reflection and interference of the silencer cavity.

[0047] The silencing device of this invention was installed at the air inlet and outlet of the indoor unit's return air duct. The test results showed that when the system was running at full load, the silencing device reduced the noise from the original 68 decibels to 45 decibels, which significantly improved the comfort of the indoor acoustic environment. At the same time, the system airflow remained stable and there was no significant increase in resistance.

[0048] The silencing device described in this patent has a structure that ensures smooth airflow, especially since all partitions have dense ventilation holes, allowing airflow to pass freely and avoiding significant resistance to the system's air volume; it also significantly reduces noise, particularly with excellent absorption of mid-to-high frequency noise.

[0049] Furthermore, our patent features a modular design for the silencing device, with the air inlet silencing module 1 and the air outlet silencing module 2 having a very compact structure that can be directly integrated into the return air duct or added as a modular component, making installation very convenient; in addition, the use of high-performance materials provides excellent corrosion resistance and long-term stability.

[0050] The above embodiments and illustrations are not intended to limit the product form and style of the present invention. Any appropriate changes and modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims

1. A silencer for the return air duct of an all-air system, characterized in that: The system includes at least one air intake silencing module. The air intake silencing module includes a first outer shell, which forms a first inner cavity that extends from front to back. Several first partitions divide the first inner cavity into at least one first silencing chamber that is open along the through direction of the first inner cavity. The first partition is a plate with ventilation holes and a certain supporting strength, either partially or entirely. The air intake silencing module is built into the air inlet of the return air duct. The shape of the first outer shell matches the shape of the corresponding air inlet of the return air duct, and the first inner cavity that extends from front to back is consistent with the air intake direction of the return air duct.

2. The silencer for the return air duct of an all-air system as described in claim 1, characterized in that: Another second partition is combined with the two side walls of the first inner cavity to form a second silencing cavity. Specifically, the second partition extends vertically and along the penetrating direction of the first inner cavity. The front end of the second partition is closely fitted with the side wall to form an air inlet end face. The air inlet end face does not have ventilation holes, so as to block and guide the airflow when air is introduced, thereby reducing wind noise.

3. The silencer for the return air duct of an all-air system as described in claim 1, characterized in that: At the air inlet port of the air inlet silencing module, the front end of the air inlet of each first silencing chamber forms a closed air inlet end face. The air inlet end face does not have a vent hole, which is used to block and guide the airflow during air intake to reduce wind noise. The air inlet end face is arc-shaped.

4. A silencer for a return air duct of an all-air system as described in any one of claims 1-3, characterized in that: Another air outlet silencing module includes a second outer shell, which forms a second inner cavity that extends from front to back. Several third partitions divide the second inner cavity into at least one third silencing chamber that is open along the through direction of the second inner cavity. The third partition is a plate with dense ventilation holes and a certain supporting strength. The air outlet silencing module is built into the air outlet end of the return air duct. The shape of the second outer shell matches the shape of the corresponding air outlet end of the return air duct, and the second inner cavity that extends from front to back is consistent with the air outlet direction of the return air duct.

5. The silencer for the return air duct of an all-air system as described in claim 4, characterized in that: Additionally, a fourth partition is combined with the two side walls of the second inner cavity to form a fourth silencing cavity. Specifically, the fourth partition extends vertically and along the penetrating direction of the second inner cavity. The front end of the fourth partition is tightly fitted with the side wall to form an air outlet face. The air outlet face has dense ventilation holes. The air outlet face is arc-shaped, and the arc shape guides the penetrating direction of the second inner cavity.

6. The silencer for the return air duct of an all-air system as described in claim 4, characterized in that: At the air outlet port of the air outlet silencing module, the rear end of each third silencing cavity forms an air outlet end face, which has dense ventilation holes; the air outlet end face is arc-shaped.

7. The silencer for the return air duct of an all-air system as described in claim 4, characterized in that: The front end and / or rear end of the first housing and / or the second housing are provided with peripheral flanges, and the peripheral flanges are provided with a plurality of mounting holes, so as to assemble the air inlet silencing module and the air outlet silencing module into the air inlet and air outlet of the return air duct, respectively.

8. The silencer for the return air duct of an all-air system as described in claim 4, characterized in that: The bottom of both the first and second outer shells is equipped with a guide structure to facilitate quick push-in installation.

9. The silencer for the return air duct of an all-air system as described in claim 4, characterized in that: The panels of the first and second partitions are made of materials with high sound absorption coefficients.

10. A return air duct for an all-air system, characterized in that: The air inlet of the return air duct is equipped with an air inlet silencer module as described in any one of claims 1-9; the air outlet of the return air duct is equipped with an air outlet silencer module as described in any one of claims 5-9.

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