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

Abstract

The invention 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 low-heat-conductivity-coefficient porous silencing material is matched, so that the ventilation opening has the good heat insulation capacity at the same time.

Description

Technical Field

[0001] The present invention 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 that combines sound attenuation, noise reduction, and heat insulation functions. Background Art

[0002] Aircraft cockpit blinds adjustable vents are accessories for adjusting the air outlet direction of the environmental control in the cockpit of military and civilian aircraft, and are directly facing the crew. It is an important accessory for the interaction between the aircraft environmental control system and the crew. Ventilation grilles are widely used in various models and are in large quantities. In addition to adapting to the working environment on the aircraft to achieve basic ventilation and adjustment functions, ventilation grilles also need to consider other functions to improve cabin comfort, such as noise reduction. After passing through multiple stages of pipelines and equipment, the environmental control air in the environmental control system is mixed with high-decibel broadband noise, which will affect the psychology and health of the crew. Considering the ergonomic design of airborne equipment, in order to improve the comfort of the aircraft cabin, noise reduction has gradually become another important requirement for vent equipment in addition to basic ventilation and adjustment functions. Summary of the invention

[0003] In view of the problems described in the background technology, the present invention aims to provide an adjustable vent with noise reduction and heat insulation functions, which can eliminate most of the noise caused by the environmental control wind in the environmental control system on the one hand, and improve the heat insulation capacity of the vent on the other hand, which can prevent heat loss in the heating pipeline and condensation in the cooling pipeline. Furthermore, it can also be promoted and applied to civilian vehicles such as cars and trains and even public places and buildings.

[0004] To achieve the above object, 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 is mainly composed of outer blades close to an air outlet of the ventilation grille assembly and inner blades close to an air inlet of the ventilation grille assembly, the inner blades rotate around a first rotating shaft, and the outer blades rotate around a second rotating shaft, and the first rotating shaft and the second rotating shaft are perpendicular to each other;

[0007] A silencer assembly is connected to the air inlet of the ventilation grille assembly, and the silencer assembly includes a guide hood, which is mainly composed of an inner wall and an outer wall. The inner wall is provided with silencer holes, and a cavity serving as a silencer cavity is formed between the inner wall and the outer wall. The silencer cavity 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 surface of the air guide cover is provided with a slope, which faces the air inlet nozzle, and the angle of the slope makes the airflow entering the air inlet nozzle be reflected by the slope and directed 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 surface.

[0011] As an option, the air deflector is connected to the ventilation grille assembly via 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 with the prior art, the present invention designs the form of the vents and the structure and size of the muffler cover according to different application scenarios, functional performance and installation requirements, forming a standardized structural design, which can improve the safety and reliability of the vents. Furthermore, the standardized design level of aircraft vents is improved, and the development risks brought by the application of new structures are reduced.

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

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

[0018] (2) A sound-absorbing and noise-reducing material is arranged in the interlayer (silence chamber) 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 radiation noise radiated 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 heat insulation ability, which greatly improves the heat 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 flange-connected, 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 air guide cover in the muffler cover assembly;

[0023] Figure 3 The figure is a schematic diagram of the shape of the air guide cover and the muffler cavity in the muffler cover 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, but 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 the 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 attenuation, 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 ventilation grille assembly 1, and the noise reduction function is mainly realized by the silencer cover assembly 2, and the silencer cover assembly 2 has a porous inner wall surface 3 and a sound-absorbing and noise-reducing medium inside.

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

[0028] like Figure 1 The ventilation grille assembly 1 has two layers of blades installed inside, which are divided into outer blades and inner blades. The rotating shafts of the two layers of blades are arranged perpendicular to each other and can rotate within a certain angle. Each layer of blades is connected as a whole by transmission parts. Multiple blades on the same layer are kept parallel to each other. The inner blades and the outer blades jointly realize the function of adjusting the wind direction. As a reference, the design of the ventilation grille assembly 1 can refer to the adjustable vent in the Chinese utility model patent CN219192550U submitted by the applicant.

[0029] The muffler assembly 2 is installed at the rear of the ventilation grille assembly (i.e., at the air inlet), such as Figure 2 The main body of the muffler assembly 2 is a guide hood structure. The right side of the guide hood is a circular nozzle as an airflow inlet, which is connected to the environmental control pipeline. The airflow outlet of the guide hood is a square flange structure, which is connected to the ventilation grille assembly 1. The muffler assembly 2 adopts a double-layer wall design, in which the outer wall is a conventional thin wall without holes, and the inner wall is a porous inner wall 3. A cavity of a certain thickness is formed between the inner wall and the outer wall as a muffler cavity 4, and a porous sound-absorbing and noise-reducing material is installed in the muffler cavity 4, such as glass fiber wool, polyimide foam, etc. When the airflow with noise enters the muffler assembly 2 from the circular nozzle, the air will not flow into the muffler chamber 4 because the outer wall is a sealing surface, but will flow along the inner wall to the air inlet of the ventilation grille assembly 1, and the noise will be transmitted from the hole to the porous sound-absorbing and noise-reducing material. When the sound propagates in the porous sound-absorbing and noise-reducing material, the sound energy will be converted into heat energy due to friction and dissipated, thereby reducing the noise (including the noise directly transmitted from the grille outlet and the radiated noise transmitted through the wall). The double-layer wall structure and the characteristics of the porous noise-reducing and noise-absorbing material with low thermal conductivity will greatly improve the thermal insulation capacity of the vent.

[0030] like Figure 1 , is a schematic diagram of a three-dimensional structure of an adjustable vent with noise reduction and heat insulation functions. The functions of the structure are mainly realized by the ventilation grille component 1 and the muffler cover component 2. The ventilation grille component 1 realizes the function of adjusting the wind direction through rotatable double-layer blades, and other vent structures such as rotating nozzles can also be used. The muffler cover component 2 reduces noise through the effect of its internal porous noise reduction and sound absorption 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 the functions of sound attenuation, noise reduction and heat insulation. The shape and inner cavity of the deflector cover in the silencer cover assembly 2 are both arched, and the specific structure and size are adjusted according to demand. The inner wall surface is a porous structure, generally with a pore size of 3mm to 5mm and a porosity of 40% to 50%. The silencer cavity 4 formed between the inner wall surface and the outer wall surface needs to have a certain thickness, and usually ensures that the thickness of the sound-absorbing and noise-reducing material in the silencer cavity 4 is not less than 5mm.

[0032] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall 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), the ventilation grille assembly (1) mainly comprising outer blades close to an air outlet of the ventilation grille assembly (1) and inner blades close to an air inlet of the ventilation grille assembly (1), the inner blades rotating around a first rotating shaft, the outer blades rotating around a second rotating shaft, the first rotating shaft and the second rotating shaft being perpendicular to each other; A muffler assembly (2) is connected to the air inlet of a ventilation grille assembly (1). The muffler assembly (2) comprises a guide hood, 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 sound absorbing and noise reducing material, or is filled with sound absorbing and noise reducing material and heat insulating material at the same time.

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 surface of the air guide cover is provided with an inclined surface, which faces the air inlet nozzle, and the angle of the inclined surface is such that the airflow entering the air inlet nozzle is reflected by the inclined surface 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 sound-absorbing holes on the inner wall surface is 3 mm to 5 mm, 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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