Adjustable ventilation opening with noise elimination, noise reduction and heat insulation functions

Abstract

The utility model discloses an adjustable ventilation opening with noise elimination, noise reduction and heat insulation functions, which can reduce noise in a pipeline while adjusting the wind direction, and has better heat insulation capability. The ventilation opening is divided into a ventilation grille assembly and a silencing cover assembly, the ventilation grille assembly is of a common louver grille structure, the silencing cover assembly is composed of a silencing cover and a porous silencing material, the silencing cover is of a double-layer wall face structure, a flow channel is formed in the inner layer wall face, the silencing cover is machined to be of a porous structure, and a closed silencing cavity is formed between the inner layer wall face and the outer layer wall face. The porous silencing material is arranged in the cavity, when airflow with noise flows through the internal flow channel, air flows out of the grille along the flow channel, the noise enters the porous silencing material through the holes in the inner layer wall face, and sound energy is converted into heat energy through friction to be dissipated when the noise is spread in the porous silencing material. The ventilation opening is of a double-layer structure, and the ventilation opening is made to have the good heat insulation capacity by being matched with the porous silencing material with the low heat conductivity coefficient.

Description

Technical Field

[0001] The utility model belongs to the technical field of aircraft environmental control systems and can also be used in civil fields such as automobiles, trains, ships, and buildings. It specifically relates to an adjustable vent with sound absorption, noise reduction, and heat insulation functions. Background Art

[0002] Aircraft cockpit louvered adjustable vents are used in military and civilian aircraft cockpits to adjust the direction of environmental control airflow, facing the crew directly. They are crucial components for the interaction between the aircraft's environmental control system and the crew. Ventilation grilles are widely used across various aircraft models and are widely available. Besides adapting to the aircraft's operating environment and fulfilling basic ventilation and conditioning functions, ventilation grilles must also consider other aspects of cabin comfort, such as noise reduction. After passing through multiple stages of piping and equipment in the environmental control system, the controlled air is mixed with high-decibel broadband noise, which can negatively impact the psychological well-being of the crew. Considering the ergonomic design of onboard equipment, noise reduction has become a key requirement for vents, in addition to their basic ventilation and conditioning functions, to enhance cabin comfort. Summary of the Invention

[0003] To address the issues discussed in the background art, this utility model aims to provide an adjustable vent with both noise reduction and thermal insulation capabilities. This design eliminates most of the noise generated by the controlled airflow in the environmental control system while also enhancing the vent's thermal insulation, preventing heat loss in heating pipes and condensation in cooling pipes. Furthermore, this design can be applied to civilian vehicles such as cars and trains, and even to public places and buildings.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] An adjustable vent with noise reduction and heat insulation functions, comprising:

[0006] A ventilation grille assembly, wherein the ventilation grille assembly mainly comprises outer blades near the air outlet of the ventilation grille assembly and inner blades near the air inlet of the ventilation grille assembly, wherein the inner blades rotate around a first rotation axis and the outer blades rotate around a second rotation axis, and the first rotation axis and the second rotation axis are perpendicular to each other;

[0007] A silencer assembly is connected to the air inlet of the ventilation grille assembly. The silencer assembly includes a guide cover, which is mainly composed of an inner wall and an outer wall. The inner wall is provided with silencer holes. A cavity serving as a silencer chamber is formed between the inner wall and the outer wall. The silencer chamber is filled with sound-absorbing and noise-reducing materials, or is filled with sound-absorbing and noise-reducing materials and heat-insulating materials at the same time.

[0008] Furthermore, the air guide cover is provided with an air inlet nozzle with a circular cross section, and the air inlet nozzle is parallel to the second rotation axis direction of the outer blades;

[0009] The inner wall of the air guide cover is provided with a slope, which faces the air inlet nozzle. The angle of the slope makes the airflow entering the air inlet nozzle reflected by the slope point to the air inlet of the ventilation grille assembly.

[0010] As an option, the inner blades and the outer blades are both located in a concave cavity formed by the inner wall.

[0011] As an option, the air deflector is connected to the ventilation grille assembly through a flange structure.

[0012] As an option, the cross section of the fairing is arched.

[0013] As an option, the diameter of the silencer holes on the inner wall is 3 mm to 5 mm, and the porosity is 40% to 50%.

[0014] As an option, the thickness of the muffler cavity is not less than 5 mm.

[0015] Compared to existing technologies, this new design tailors the vent form and the structure and dimensions of the muffler cover to meet diverse application scenarios, functional performance, and installation requirements. This standardized design improves the vent's operational safety and reliability. Furthermore, it raises the bar for standardized aircraft vent design and reduces the development risks associated with the application of novel structures.

[0016] Compared with the prior art, the present invention also has the following advantages:

[0017] (1) In addition to the basic ventilation and regulation functions of traditional vents, the present invention also has the function of reducing noise mixed in the air flow.

[0018] (2) A sound-absorbing and noise-reducing material is arranged in the interlayer (silencer cavity) between the inner and outer walls of the air deflector. In addition to reducing the noise in the flow channel, it can also reduce the radiated noise radiating outward through the air deflector wall. (3) When a porous sound-absorbing and noise-reducing material with a low thermal conductivity is selected, in addition to the sound-absorbing and noise-reducing function, it also has good thermal insulation capabilities, which greatly improves the thermal insulation capacity of the vents, prevents heat loss in heating pipes, and prevents condensation in cooling pipes.

[0019] (4) The ventilation grille assembly and the muffler assembly are connected by flanges, which makes subsequent replacement and maintenance very convenient. In particular, when the performance of the muffler assembly deteriorates, it can be quickly disassembled, replaced or cleaned.

[0020] (5) The inner wall of the silencer assembly changes the wind direction through the inclined surface away from the air inlet nozzle, and the air inlet nozzle and the inclined surface are covered with silencer holes and silencer cavities, so as to maximize the use of the length of the silencer assembly to reduce noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the three-dimensional structure of the adjustable vent designed for the present invention with noise reduction and heat insulation functions;

[0022] Figure 2 A schematic diagram of the muffler holes on the inner wall of the deflector cover in the muffler cover assembly;

[0023] Figure 3 The figure is a schematic diagram of the shape of the guide cover and the muffler cavity in the muffler assembly;

[0024] In the figure, 1-ventilation grille assembly; 2-muffler cover assembly; 3-porous inner wall surface; 4-muffler chamber. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. However, it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to common technical knowledge and customary means in the field are included in the scope of the present invention.

[0026] like Figure 1 As shown, an adjustable vent with sound absorption, noise reduction and heat insulation functions designed for this embodiment includes a ventilation grille assembly 1 and a silencer cover assembly 2, wherein the basic ventilation and adjustment functions are realized by the ventilation grille assembly 1, and the airflow direction is adjusted by rotating the rotatable inner blades and outer blades inside the assembly. The noise reduction function is mainly realized by the silencer cover assembly 2, and the interior of the silencer cover assembly 2 is provided with a porous inner wall surface 3 and a sound-absorbing and noise-reducing medium.

[0027] The adjustable vents with noise reduction and heat insulation functions combine the structure and working principle of traditional vents with resistive silencers. Its main functions are as follows:

[0028] like Figure 1 The ventilation grille assembly 1 is internally mounted with two layers of blades: an outer layer and an inner layer. The two layers' shafts are arranged perpendicular to each other, allowing them to rotate within a certain angle. Each layer of blades is connected as a whole by a transmission component. Multiple blades on the same layer remain parallel to each other, and the inner and outer blades work together to adjust the wind direction. For reference, the design of the ventilation grille assembly 1 can be found in the applicant's Chinese utility model patent CN219192550U, titled "Adjustable Vent."

[0029] The muffler assembly 2 is installed at the rear of the ventilation grille assembly (i.e., at the air inlet), as shown in FIG. Figure 2 The main body of the muffler assembly 2 is a shroud structure. On the right side of the shroud is a circular nozzle serving as the air inlet, which is connected to the environmental control pipeline. The air outlet of the shroud is a square flange structure connected to the ventilation grille assembly 1. The muffler assembly 2 adopts a double-wall design, with the outer wall being a conventional thin wall without holes and the inner wall being a porous inner wall 3. A cavity of a certain thickness is formed between the inner and outer walls, serving as the muffler chamber 4. A porous sound-absorbing and noise-reducing material, such as glass fiber cotton or polyimide foam, is installed in the muffler chamber 4. When noisy air enters the muffler assembly 2 from the circular nozzle, the air does not flow into the muffler chamber 4 because the outer wall is a sealed surface. Instead, it flows along the inner wall toward the air inlet of the ventilation grille assembly 1. The noise is then transmitted through the holes into the porous sound-absorbing and noise-reducing material. As the sound propagates through the porous sound-absorbing and noise-reducing material, friction converts the sound energy into heat energy, which is dissipated, thereby reducing the noise (both the noise transmitted directly from the grille outlet and the radiated noise transmitted through the wall). The double-wall structure and the low thermal conductivity of the porous noise-reducing and sound-absorbing material significantly enhance the thermal insulation capacity of the vent.

[0030] like Figure 1 The figure below is a schematic diagram of the three-dimensional structure of an adjustable vent with noise reduction and heat insulation functions. The structure's functions are primarily accomplished by the ventilation grille assembly 1 and the muffler cover assembly 2. The ventilation grille assembly 1 adjusts air direction through rotatable double-layer blades, but other vent structures, such as rotating nozzles, can also be used. The muffler cover assembly 2 reduces noise through its internal porous noise-reducing and sound-absorbing material.

[0031] like Figure 2 and Figure 3 As shown, it is a structural schematic diagram of the silencer cover assembly 2 in the adjustable vent with sound absorption, noise reduction and heat insulation functions. The shape and inner cavity of the air guide cover in the silencer cover assembly 2 are both arched. The specific structure and size are adjusted according to demand. The inner wall is a porous structure, generally with a pore diameter of 3mm to 5mm and a porosity of 40% to 50%. The silencer cavity 4 formed between the inner wall and the outer wall needs to have a certain thickness, and usually ensure that the thickness of the sound absorption and noise reduction material in the silencer cavity 4 is not less than 5mm.

[0032] The above is only one specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of the claims.

Claims

1. An adjustable vent with noise reduction and heat insulation functions, characterized in that: include: A ventilation grille assembly (1), wherein the ventilation grille assembly (1) mainly comprises outer blades near an air outlet of the ventilation grille assembly (1) and inner blades near an air inlet of the ventilation grille assembly (1), wherein the inner blades rotate around a first rotation axis and the outer blades rotate around a second rotation axis, and the first rotation axis and the second rotation axis are perpendicular to each other; A muffler cover assembly (2) is connected to the air inlet of the ventilation grille assembly (1). The muffler cover assembly (2) includes a guide cover, which is mainly composed of an inner wall surface and an outer wall surface. The inner wall surface is provided with muffler holes. A cavity serving as a muffler chamber (4) is formed between the inner wall surface and the outer wall surface. The muffler chamber (4) is filled with a sound-absorbing and noise-reducing material, or is filled with both the sound-absorbing and noise-reducing material and a heat-insulating material.

2. The adjustable vent with noise reduction and heat insulation functions according to claim 1, characterized in that: The deflector is provided with an air inlet nozzle with a circular cross section, and the air inlet nozzle is parallel to the second rotation axis direction of the outer blades; The inner wall of the air guide cover is provided with a slope, which faces the air inlet nozzle, and the angle of the slope is such that the airflow entering the air inlet nozzle is reflected by the slope and directed to the air inlet of the ventilation grille assembly (1).

3. The adjustable vent with noise reduction and heat insulation functions according to claim 1, characterized in that: The inner blades and the outer blades are both located in the concave cavity formed by the inner wall surface.

4. The adjustable vent with noise reduction and heat insulation functions according to claim 1, characterized in that: The air guide cover is connected to the ventilation grille assembly (1) via a flange structure.

5. The adjustable vent with noise reduction and heat insulation functions according to claim 1, characterized in that: The cross section of the air guide cover is arched.

6. The adjustable vent with noise reduction and heat insulation functions according to claim 1, characterized in that: The diameter of the silencer holes on the inner layer wall is 3mm to 5mm, and the porosity is 40% to 50%.

7. The adjustable vent with noise reduction and heat insulation functions according to claim 1, characterized in that: The thickness of the muffler cavity (4) is not less than 5 mm.

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