Gas circuit structure and device for separating noise in closed gas circuit

Abstract

The utility model discloses a gas circuit structure and a device for separating noise in a closed gas circuit, and aims to control the local sound transmission coefficient of a closed gas circuit structure, firstly transmit most noise sound waves out, and then utilize the cooperation of a sound transmission separator, an airflow cavity and a sound absorption cavity to carry out noise reduction, so that the noise in the closed gas circuit structure is reduced, and the noise in the closed gas circuit structure is reduced. The sound transmission separator greatly improves the local sound transmission coefficient of the gas path, when gas flows through the gas flow cavity, most of sound energy is transmitted into the sound absorption cavity through the sound transmission separator in the form of sound waves, and then the sound absorption characteristic of the sound absorption cavity and the built-in sound absorption filler are utilized to consume the sound energy, so that the purpose of noise reduction is achieved. Besides, due to the material characteristic of the elastic soft rubber of the sound transmission separator, the sound transmission separator has certain vibration reduction and noise reduction functions, and through the design of the isolation airflow cavity and the sound absorption cavity, on the premise that the good noise level of the gas circuit device is kept, the health risk caused by aging of the silencing material of a traditional gas circuit silencing device is avoided.

Description

Technical Field

[0001] This utility model relates to the field of air passage structure, specifically an air passage structure and device for separating noise in a closed air passage. Background Technology

[0002] Currently, all commercially available ventilators have sound-absorbing cotton inside their airway module. Without this cotton, they cannot meet the regulatory requirement of noise levels below 30 dBA. While the sound-absorbing cotton inside the ventilator's airway can reduce noise, it can also release particulate matter during use, which can be inhaled. Over time, as the cotton ages, this phenomenon worsens, and the release of VOCs can also contribute to carcinogenesis.

[0003] In summary, the existing airway structure of ventilators has many drawbacks, which are summarized as follows:

[0004] ① How to solve the problems of biocompatibility and user safety and stability caused by the aging and precipitation of particulate matter in the sound-absorbing cotton inside the gas circuit after long-term use, and avoid the harm to the human body caused by the inhalation of the sound-absorbing cotton particulate matter;

[0005] ② How to reduce the noise of the ventilator's airway module;

[0006] ③ How to solve the problem of strong mechanical vibration caused by the high-speed rotating fan inside the air circuit, which can easily be transmitted to the base plate through the hard wall and cause vibration and noise problems in the whole machine. Utility Model Content

[0007] To address the shortcomings of existing technologies, this invention provides an air path structure and device for separating noise in a closed air path, thereby solving the aforementioned problems.

[0008] To achieve the above objectives, this utility model is implemented through the following technical solution.

[0009] An air passage structure for separating noise in a closed air passage, comprising a closed noise reduction structure.

[0010] The sealed noise reduction structure includes a sound-permeable partition, an airflow cavity, and a sound-absorbing cavity, wherein the airflow cavity and the sound-absorbing cavity are separated by the sound-permeable partition.

[0011] The sound-absorbing cavity is filled with sound-absorbing material to absorb sound transmitted by the sound-permeable partition. Unlike commercially available airflow structures that use built-in sound-absorbing cotton for noise reduction, this solution aims to control the local sound transmission coefficient of a sealed airflow structure, allowing most noise waves to pass through first. Then, the sound-permeable partition, airflow cavity, and sound-absorbing cavity work together to reduce noise. The sound-permeable partition significantly increases the local sound transmission coefficient of the airflow. When gas flows through the airflow cavity, most of the sound energy is transmitted as sound waves through the sound-permeable partition to the sound-absorbing cavity. The sound-absorbing cavity's sound absorption characteristics and the built-in sound-absorbing material then dissipate the sound energy, achieving noise reduction. Furthermore, the elastic soft rubber material of the sound-permeable partition also has vibration damping and noise reduction functions. By isolating the airflow cavity and the sound-absorbing cavity, the airflow device maintains a good noise level while avoiding the health risks associated with the aging of sound-absorbing materials in traditional airflow silencers.

[0012] Preferably, the sound-permeable partition is sealed to the sound-absorbing cavity to isolate airflow, particulate matter, VOC emissions, and to allow noise energy to be transferred from the airflow cavity to the sound-absorbing cavity through its own vibration.

[0013] Preferably, the shapes of the sound-permeable separator, the airflow cavity, and the sound-absorbing cavity on their horizontal planes are compatible.

[0014] An air path device for separating noise in a closed air path includes a closed noise reduction structure, a housing, and a base plate.

[0015] The sealed noise reduction structure is sealed on one side and connected to the base plate to form a sound-absorbing cavity;

[0016] The other side of the sealed noise reduction structure is fitted and sealed to the shell to form an airflow cavity.

[0017] Preferably, the inner wall surface of the airflow cavity corresponding to the shell is a noise-reducing wall surface.

[0018] Preferably, the sound-absorbing filler is fully filled in the internal space between the sound-permeable partition and the base plate. The combination of "sound-permeable partition + sound-absorbing cavity" not only eliminates the direct contact between the sound-absorbing cotton inside the air passage and the gas, but also solves the biocompatibility problem of the sound-absorbing cotton inside the air passage. This is because the sound-absorbing cotton will release more particulate matter after long-term use and aging. These particulate matter can be harmful to the human body if inhaled. The sound-absorbing cotton's sound absorption and noise reduction properties are utilized to ensure the overall noise level of the machine. The high-speed rotating fan inside the air passage generates strong mechanical vibration. This vibration can easily be transmitted to the base plate through the hard wall, causing vibration and noise problems in the whole machine. The sound-permeable partition is in direct contact with the base plate, which helps to reduce this vibration. The inner wall of the airflow cavity corresponding to the shell is a noise-reducing wall, which can work together with the combination of "sound-permeable partition + airflow cavity + sound-absorbing cavity" to reduce noise.

[0019] Compared to existing technologies, this utility model discloses an air path structure for separating noise in a closed air path, including a closed noise reduction structure. The closed noise reduction structure comprises a sound-transmitting separator, an airflow cavity, and a sound-absorbing cavity, which work together to achieve their function. Furthermore, it provides an air path device for separating noise in a closed air path.

[0020] ① Unlike other solutions on the market that use built-in sound-absorbing cotton to reduce noise in the air passage structure, this solution aims to control the local sound transmission coefficient of a sealed air passage structure to first transmit most of the noise sound waves. Then, it uses sound-transparent partitions, airflow cavities, and sound-absorbing cavities to reduce noise. The sound-transparent partitions greatly improve the local sound transmission coefficient of the air passage. When the gas flows through the airflow cavity, most of the sound energy is transmitted to the sound-absorbing cavity in the form of sound waves through the sound-transparent partitions. The sound absorption characteristics of the sound-absorbing cavity and the built-in sound-absorbing filler are then used to consume the sound energy, thereby achieving the purpose of noise reduction.

[0021] ② The combination of "sound-permeable partition + sound-absorbing cavity" not only eliminates the direct contact between the sound-absorbing cotton inside the air path and the gas, but also solves the biocompatibility problem of the sound-absorbing cotton inside the air path. This is because the sound-absorbing cotton will release more particulate matter after long-term use and aging. These particulate matter can be harmful to the human body if inhaled. The sound-absorbing cotton's noise reduction properties are also utilized to ensure the overall noise level of the machine.

[0022] ③ The high-speed rotating fan inside the air passage brings strong mechanical vibration. This vibration can easily be transmitted to the bottom plate through the hard wall, thus causing vibration and noise problems in the whole machine. The sound-permeable partition is in direct contact with the bottom plate, which helps to reduce this vibration.

[0023] ④ The inner wall of the airflow cavity is a noise reduction wall, which can be used in conjunction with the combination of "sound-permeable partition + airflow cavity + sound-absorbing cavity" for noise reduction. Attached Figure Description

[0024] Figure 1 This is an exploded structural diagram of the device for separating noise in a closed air circuit according to this utility model;

[0025] Figure 2 This is an exploded structural diagram of the device for separating noise in a closed air circuit according to this utility model;

[0026] Figure 3 This is a schematic diagram of the airflow direction of the device for separating noise in a closed air circuit according to this utility model. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Example 1

[0029] An airflow structure for separating noise in a closed airflow path, comprising a closed noise reduction structure.

[0030] The sealed noise reduction structure includes a sound-permeable partition 1, an airflow cavity, and a sound-absorbing cavity. The airflow cavity and the sound-absorbing cavity are separated by the sound-permeable partition 1. The sound-absorbing cavity is filled with sound-absorbing material 4 to absorb the sound transmitted by the sound-permeable partition. The sound-permeable partition 1 is sealed to the sound-absorbing cavity to isolate airflow, particulate matter, and VOC emissions, and to allow noise energy to be transmitted from the airflow cavity to the sound-absorbing cavity through its own vibration. The shapes of the horizontal planes of the sound-permeable partition 1, the airflow cavity, and the sound-absorbing cavity are compatible.

[0031] This embodiment also discloses an air path device for separating noise in a closed air path, comprising a closed noise reduction structure, a housing 2, and a base plate 3. One side of the closed noise reduction structure is sealed and connected to the base plate 3 to form a sound-absorbing cavity; the other side of the closed noise reduction structure is fitted and sealed to the housing 2 to form an airflow cavity. The inner wall surface of the airflow cavity corresponding to the housing 2 is a noise-reducing wall surface.

[0032] The main parameter considered when selecting materials for the sound-permeable partition 1 is its sound transmission capacity. Based on this parameter, the sound-permeable partition 1 can be made of rigid or flexible materials. Rigid materials include, but are not limited to, carbon fiber and glass fiber, while flexible materials include, but are not limited to, rubber, polyethylene, and TPU. In this embodiment, to further improve the noise reduction capability, the sound-permeable partition 2 is preferably made of an elastic and flexible material. When sound passes through the sound-permeable partition 1, the partition 1 will vibrate, thus dissipating the energy in the sound through vibration, thereby achieving the purpose of improving the noise reduction capability.

[0033] The sound-absorbing filler 4 is sound-absorbing cotton, but it is worth noting that sound-absorbing cotton is only one option in this embodiment. Any material that can actually perform the sound absorption function can be used as the sound-absorbing filler 4. The sound-absorbing filler 4 is fully filled in the internal space between the sound-permeable partition 1 and the base plate 3.

[0034] After the gas enters the airflow cavity, some of the sound energy is dissipated by the vibration of the sound-permeable partition 1, driven by the noise waves, thanks to the elastic properties of the partition itself. Simultaneously, the sound-permeable partition 1 increases the local sound transmission coefficient of the airflow cavity, allowing another portion of the sound waves to be transmitted through it into the interior, where they are absorbed and reduced by the sound-absorbing filler 4. If the wall is rigid, the sound wave transmittance will be too low to efficiently transmit and absorb noise. If the sound-absorbing material is used directly inside the airway without a membrane barrier, there will be safety risks. Furthermore, through structural design, the sound-permeable partition 1 and the shell 2 form a sealed gas chamber, which also contributes to noise reduction.

[0035] While ensuring that the overall noise level meets the standards, it fundamentally solves the biocompatibility problem of the sound-absorbing cotton inside the air passage, preventing the inhalation of particles released from the sound-absorbing cotton inside the air passage, thus greatly improving the user's safety.

[0036] Example 2

[0037] Without altering other technical features, the sound-absorbing filler 4 is polyurethane foam.

[0038] Example 3

[0039] Without altering other technical features, the sound-absorbing filler 4 is a wave-shaped sponge.

[0040] Example 4

[0041] Without altering other technical features, the sound-absorbing filler 4 is expanded foam.

[0042] Example 5

[0043] Without altering other technical features, the sound-absorbing filler 4 is a fiber material.

[0044] Example 6

[0045] Without altering other technical features, the noise-reducing wall surface is a perforated plate.

[0046] Example 7

[0047] Without changing other technical features, the noise reduction wall surface is a resonant cavity.

[0048] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0049] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0050] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An air passage structure for separating noise in a closed air passage, characterized in that: Including a sealed noise reduction structure, The sealed noise reduction structure includes a sound-permeable partition, an airflow cavity, and a sound-absorbing cavity, wherein the airflow cavity and the sound-absorbing cavity are separated by the sound-permeable partition. The sound-absorbing cavity is filled with sound-absorbing material to absorb the sound transmitted by the sound-transmitting separator.

2. The air passage structure for separating noise in a closed air passage according to claim 1, characterized in that: The sound-permeable partition is sealed to the sound-absorbing cavity to isolate airflow, particulate matter, VOC emissions, and to allow noise energy to be transferred from the airflow cavity to the sound-absorbing cavity through its own vibration.

3. The air passage structure for separating noise in a closed air passage according to claim 1, characterized in that: The shapes of the sound-permeable partition, the airflow cavity, and the sound-absorbing cavity on the horizontal plane are compatible.

4. A gas path device for separating noise in a closed gas path, characterized in that: Includes the air passage structure for separating noise in a closed air passage as described in any one of claims 1-3, and further includes a housing and a base plate. The sealed noise reduction structure is sealed on one side and connected to the base plate to form a sound-absorbing cavity; The other side of the sealed noise reduction structure is fitted and sealed to the shell to form an airflow cavity.

5. The air circuit device for separating noise in a closed air circuit according to claim 4, characterized in that: The inner wall of the airflow cavity corresponding to the shell is a noise-reducing wall.

6. The air circuit device for separating noise in a closed air circuit according to claim 4, characterized in that: The sound-absorbing filler is fully filled in the internal space between the sound-permeable partition and the base plate.

Images