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

Abstract

The invention discloses a gas circuit structure and 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 reduce noise, 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 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] The invention relates to the field of air path structures, and in particular to an air path structure and a device for separating noise in a closed air path. Background Art

[0002] At present, all ventilators sold on the market have silencer cotton installed inside the air circuit module. If silencer cotton is not placed, the regulatory requirement of noise below 30dBA cannot be met. Although the silencer cotton inside the ventilator air circuit can reduce noise, it will release particles during use and be inhaled by the human body. After long-term use, the silencer cotton will age, which will aggravate this phenomenon. At the same time, it is accompanied by VOC emissions, causing cancer.

[0003] In summary, the existing ventilator's air circuit structure has many disadvantages, which are summarized as follows:

[0004] ① How to solve the biocompatibility and safety and stability issues caused by the aging and precipitation of particles from the silencer cotton inside the gas path after long-term use, and prevent the particles from being inhaled by the human body and causing harm to the human body;

[0005] ②How to reduce the noise of the ventilator gas circuit module;

[0006] ③ How to solve the problem of strong mechanical vibration caused by the high-speed rotating fan inside the air path. This vibration can easily be transmitted to the bottom plate through the hard wall, thereby causing vibration and noise problems of the whole machine. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides an air path structure and device for separating noise in a closed air path to solve the above problems.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions.

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

[0010] The enclosed noise reduction structure comprises a sound-transmitting partition, an airflow cavity, and a sound-absorbing cavity, wherein the airflow cavity and the sound-absorbing cavity are separated by the sound-transmitting partition.

[0011] The sound-absorbing cavity is provided with a filler for absorbing the sound transmitted by the sound-permeable partition. The filler is composed of sound-absorbing cotton. Different from the scheme on the market in which the air path structure has built-in sound-absorbing cotton inside the air path for noise reduction, this scheme aims to control the local sound permeability coefficient of a closed air path structure, first transmit most of the noise sound waves, and then use the sound-permeable partition, airflow cavity, and sound-absorbing cavity to reduce noise. The sound-permeable partition greatly improves the local sound permeability coefficient of the air path. When the gas flows through the airflow cavity, most of the sound energy is transmitted to the sound-absorbing cavity through the sound-permeable partition in the form of sound waves, and then the sound absorption characteristics of the sound-absorbing cavity and the built-in filler are used to consume the sound energy to achieve the purpose of noise reduction. In addition, the material properties of the elastic soft rubber of the sound-permeable partition also have certain vibration reduction and noise reduction functions. By isolating the airflow cavity and the sound-absorbing cavity, the air path device maintains a good noise level, and also avoids the health risks caused by the aging of the sound-absorbing materials of the traditional air path silencer.

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

[0013] Preferably, the shapes of the horizontal planes of the sound-permeable partition, the airflow cavity and the sound-absorbing cavity are adapted to each other.

[0014] An air path device for separating noise in a closed air path, comprising a closed noise reduction structure, a shell, and a bottom plate.

[0015] One side of the enclosed noise reduction structure is sealed and connected to the bottom plate to form a sound absorbing cavity;

[0016] The other side of the enclosed noise reduction structure is tightly and sealingly connected 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 reduction wall surface.

[0018] Preferably, the filler fills the internal space between the sound-permeable partition and the bottom plate in a full-filled manner, and the combination of "sound-permeable partition + sound-absorbing cavity" is used, which not only eliminates the direct contact of the sound-absorbing cotton in the air path with the gas, but also solves the biocompatibility problem of the sound-absorbing cotton in the air path. Because the sound-absorbing cotton will release more particles after long-term use and aging, these particles will be harmful to the human body when inhaled, and the sound-absorbing cotton's noise-reducing characteristics are used to ensure the noise level of the whole machine; the high-speed rotating fan inside the air path brings strong mechanical vibration, which can easily be transmitted to the bottom plate through the hard wall surface, thereby causing vibration and noise problems of the whole machine, and the sound-permeable partition is directly in contact with the bottom plate, which helps to reduce the vibration; the inner wall surface of the shell corresponding to the airflow cavity is a noise reduction wall surface, which can cooperate with the combination of "sound-permeable partition + airflow cavity + sound-absorbing cavity" to reduce noise.

[0019] Compared with the prior art, the present invention discloses an air path structure for separating noise in a closed air path, including a closed noise reduction structure, wherein the closed noise reduction structure includes a sound-transmitting partition, an airflow cavity, and a sound-absorbing cavity, which are used in combination with each other to play a role, and also provides an air path device for separating noise in a closed air path,

[0020] ① Different from the noise reduction scheme of the air path structure on the market, which has built-in silencing cotton inside the air path, this scheme aims to control the local sound transmission coefficient of a closed air path structure, first transmit most of the noise sound waves, and then use the sound-transmitting partition, airflow cavity, and sound-absorbing cavity to reduce noise. The sound-transmitting partition greatly improves the local sound transmission coefficient of the air path. When the gas flows through the airflow cavity, most of the sound energy is transmitted to the sound-absorbing cavity through the sound-transmitting partition in the form of sound waves, and then the sound absorption characteristics of the sound-absorbing cavity and the built-in filler are used to consume the sound energy to achieve the purpose of noise reduction;

[0021] ② The combination of "sound-transparent separator + sound-absorbing cavity" not only eliminates the direct contact of the sound-absorbing cotton in the air path with the gas, but also solves the biocompatibility problem of the sound-absorbing cotton in the air path. Because the sound-absorbing cotton will release particles after long-term use and aging, these particles will be harmful to the human body when inhaled. The sound-absorbing cotton's noise reduction characteristics are used to ensure the noise level of the whole machine;

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

[0023] ④ The inner wall surface of the shell corresponding to the airflow cavity is a noise reduction wall surface, which can cooperate with the combination of "sound-transparent partition + airflow cavity + sound-absorbing cavity" to reduce noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the explosion structure of the device for separating noise in a closed gas path of the present invention;

[0025] Figure 2 It is a schematic diagram of the explosion structure of the device for separating noise in a closed gas path of the present invention;

[0026] Figure 3 The figure is a schematic diagram of the airflow direction of the device for separating noise in a closed air path of the present invention. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] Example 1

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

[0030] The enclosed 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. A filler 4 is provided in the sound-absorbing cavity for absorbing the sound transmitted by the sound-permeable partition. The filler 4 is made of a sound-absorbing material. The sound-permeable partition 1 is sealed and connected to the sound-absorbing cavity to isolate airflow, particulate matter, and VOC emissions, and to transmit noise energy through 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 adapted to each other.

[0031] The present embodiment further discloses an air path device for separating noise in a closed air path, comprising a closed noise reduction structure, a shell 2, and a bottom plate 3. One side of the closed noise reduction structure is sealed and connected to the bottom plate 3 to form a sound absorption cavity; the other side of the closed noise reduction structure is sealed and connected to the shell 2 to form an air flow cavity. The inner side wall of the air flow cavity corresponding to the shell 2 is a noise reduction wall.

[0032] The main parameter to be considered in the selection of materials for the sound-permeable partition 1 is the sound permeability. Based on the parameter of sound permeability, the sound-permeable partition 1 can be made of a hard material or a soft material, wherein the hard material includes but is not limited to carbon fiber and glass fiber, and the soft material includes but is not limited to rubber, polyethylene and TPU. In the present embodiment, in order to further improve the noise reduction capability, the sound-permeable partition 2 is preferably made of an elastic soft material. When the sound passes through the sound-permeable partition 1, the sound-permeable partition 1 will vibrate, so the energy in the sound can be consumed by means of vibration, thereby achieving the purpose of improving the noise reduction capability.

[0033] The filler 4 is sound-absorbing cotton, but it is worth noting that the sound-absorbing cotton is only an option in this embodiment, and any material that can actually perform the sound-absorbing function can be used as the filler 4. The filler 4 fills the internal space between the sound-permeable partition 1 and the bottom plate 3 in a full manner.

[0034] After the gas enters the airflow cavity, a part of the sound energy utilizes the elastic properties of the sound-permeable partition 1 itself, and consumes the sound energy through the noise sound wave to drive its vibration, so as to achieve the purpose of partial sound absorption and noise reduction; at the same time, the sound-permeable partition 1 improves the local sound transmission coefficient of the airflow cavity, so that another part of the sound waves are transmitted to the interior through the sound-permeable partition 1, and then absorbed and noise reduced by utilizing the characteristics of the filler 4. If it is a rigid wall, the sound wave transmittance is too low and the noise cannot be efficiently transmitted and absorbed. If the sound-absorbing material is used directly in the airway without using a thin film for isolation, there will be a safety risk. In addition, through structural design, the sound-permeable partition 1 and the shell 2 form a closed gas chamber, which can also play a role in noise reduction.

[0035] While ensuring that the overall noise level meets the standard, the biocompatibility problem of the sound-absorbing cotton inside the air path is fundamentally solved. The particles precipitated from the sound-absorbing cotton inside the air path will not be inhaled by the human body, which greatly improves the user's safety.

[0036] Example 2

[0037] Based on the fact that other technical features remain unchanged, the filler 4 is polyurethane foam plastic.

[0038] Example 3

[0039] Based on the fact that other technical features remain unchanged, the filler 4 is a wave crest sponge.

[0040] Example 4

[0041] Based on the fact that other technical features remain unchanged, the filler 4 is foamed glue.

[0042] Example 5

[0043] Based on the fact that other technical features remain unchanged, the filler 4 is a fiber material.

[0044] Example 6

[0045] Based on the fact that other technical features remain unchanged, the noise reduction wall surface is a perforated plate.

[0046] Example 7

[0047] Based on the fact that other technical features remain unchanged, the noise reduction wall is a resonance cavity.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

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

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air path structure for separating noise in a closed air path, characterized in that: Including sealed noise reduction structure, The enclosed noise reduction structure comprises a sound-transmitting partition, an airflow cavity, and a sound-absorbing cavity, wherein the airflow cavity and the sound-absorbing cavity are separated by the sound-transmitting partition. The sound absorbing cavity is provided with a filler. The filler is composed of sound-absorbing cotton and is used for absorbing the sound transmitted by the sound-permeable partition.

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

3. The air path structure for separating noise in a closed air path according to claim 1, characterized in that: The shapes of the sound-transmitting partition, the airflow cavity and the sound-absorbing cavity in horizontal planes are adapted to each other.

4. The gas path device for separating noise in a closed gas path according to any one of claims 1 to 3, characterized in that: Including a closed noise reduction structure, a shell, and a bottom plate. One side of the enclosed noise reduction structure is sealed and connected to the bottom plate to form a sound absorbing cavity; The other side of the enclosed noise reduction structure is tightly and sealingly connected to the shell to form an airflow cavity.

5. The gas path device for separating noise in a closed gas path according to claim 4, characterized in that: The inner wall surface of the airflow cavity corresponding to the shell is a noise reduction wall surface.

6. The gas path device for separating noise in a closed gas path according to claim 4, characterized in that: The filler fully fills the internal space between the sound-permeable partition and the bottom plate.

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