CN219222805U - Broadband metamaterial noise reducer for household equipment ventilating duct - Google Patents

Abstract

The purpose of the utility model is to provide a broadband supermaterial noise reducer for household equipment ventilation ducts to solve the problems existing in the existing noise reduction technology for household equipment ventilation ducts. The broadband metamaterial noise reducer for household equipment ventilation ducts of the technical solution includes a broadband sound isolator arranged outside the pipeline, a broadband sound absorber arranged outside the pipeline, or a combination of a broadband sound isolator and a broadband sound absorber arranged outside the pipeline. The noise reducer structure of the utility model can be combined with the narrow available space inside the household equipment, and the frequency band of the main noise energy can be customized, and it can be used in a limited space within a few centimeters without affecting other performances. Efficiently reduce equipment noise.

Description

Broadband metamaterial noise reducer for ventilation ducts of household equipment

technical field

The invention belongs to the technical field of noise treatment, in particular to a broadband supermaterial noise reducer for ventilation ducts.

Background technique

Some household equipment in daily life will accumulate heat and matter when they are working. It is a common solution to achieve ventilation through pipes, to carry heat and accumulated substances into the pipe system, and then export them along the pipes. However, the process of air flow in the pipeline is often accompanied by noise problems. There are two main sources of this noise. One is the original mechanical or other internal environmental noise of the household equipment; the other is the additional noise generated by the fan system of the household equipment. Both types of noise have the characteristics of wide frequency band and obvious characteristic frequency (for example, the noise generated by the fan will have a characteristic frequency corresponding to the fan speed).

For example, the noise of a gas water heater mainly comes from the small centrifugal fan inside the water heater cabin. The opening on the end panel supplies air to the fan, so that the air inlet duct becomes the main source of fan noise to the room, and its main noise energy covers the frequency band of 200 to 3000 Hz.

As another example, under standard conditions, the power components of some equipment (including but not limited to pumps, compressors, motors, etc.) have significant noise problems, and the power components cannot be completely enclosed due to heat dissipation requirements, so that the power Components become the main source of room-borne noise, and their main noise energy typically covers the 160 to 4000 Hz frequency band.

This feature poses a great challenge to traditional noise reduction techniques. For traditional porous acoustic materials, such as sponge, rock surface, glass fiber, etc., their operating frequency band is wide, but they cannot be effectively customized for the characteristic noise frequency band to enhance absorption. For traditional acoustic resonance technology, such as Helmholtz resonator, although its operating frequency can be highly customized, its bandwidth is very narrow. Therefore, how to ensure broadband acoustic effects and customization capabilities for specific frequencies in a ventilated environment has become an urgent challenge.

Utility model content

The purpose of the utility model is to provide a broadband supermaterial noise reducer for household equipment ventilation ducts to solve the problems existing in the existing noise reduction technology for household equipment ventilation ducts. The noise reducer structure of the utility model can be combined with the narrow available space inside the household equipment, and the frequency band of the main noise energy can be customized, and it can be used in a limited space within a few centimeters without affecting other performances. Efficiently reduce equipment noise.

A broadband supermaterial noise reducer for household equipment ventilation ducts, comprising a broadband sound isolator arranged outside the duct, a broadband sound absorber arranged outside the duct, or a combination of the broadband sound isolator and the broadband sound absorber arranged outside the duct.

Further, the above-mentioned broadband metamaterial noise reducer for the ventilation duct of household equipment, the broadband sound isolator arranged outside the duct is composed of several resonance units arranged side by side and independent of each other, and the resonance behavior of each resonance unit is The single frequency corresponds to a frequency in the broadband noise to be reduced. The resonance unit achieves the sound insulation effect by reflecting sound waves at the resonance frequency and nearby frequencies; the resonance unit is set on the side wall of the ventilation duct, and the resonance unit opens on the ventilation duct wall. Alternatively, the resonance unit is arranged on the side wall of the ventilation duct, the resonance unit is opened on the wall of the ventilation duct, and the opening of the resonance unit is provided with a mesh covering material;

The broadband sound absorber arranged outside the pipeline is composed of several parallel and independent resonance units. The resonance behavior of each resonance unit is single-frequency and corresponds to a frequency in the broadband noise to be reduced. The resonance unit passes The sound absorption effect is achieved by converting noise energy into heat energy and dissipating it; the resonance unit is set on the side wall of the ventilation duct, and the resonance unit opens on the wall of the ventilation duct, or the resonance unit is set on the side wall of the ventilation duct, and the resonance unit opens on the The pipe wall of the ventilation duct and the opening of the resonance unit are provided with a mesh covering material.

Further, the above-mentioned broadband supermaterial noise reducer for the ventilation duct of household equipment has several holes on the wall of the ventilation duct, which are respectively connected to the resonance unit of the broadband sound isolator or the broadband sound absorber arranged outside the duct. Corresponding.

Further, the above-mentioned broadband metamaterial noise reducer for ventilation ducts of household equipment, the resonance unit includes but is not limited to Fabry-Perot (quarter wavelength) resonators, Helm The Holtz resonator and the resonator whose cavity is of any shape.

Further, in the above-mentioned broadband metamaterial noise reducer for ventilation ducts of household equipment, several resonant units are arranged in a geometric shape with cavities with the same or different cross-sections, and each cavity is on a certain plane or curved surface or on a Bending and folding in three-dimensional space.

Further, the above-mentioned broadband metamaterial noise reducer for ventilation ducts of household equipment, the material of the metamaterial noise reducer includes but not limited to metal, plastic, wood, leather, paper, ceramics and any combination of the above six materials.

Further, the above-mentioned broadband supermaterial noise reducer for ventilation ducts of household equipment, the mesh covering materials include but not limited to metal mesh, sponge, woven cloth, paper, glass fiber cloth, acoustic perforated board and the above six materials any combination of .

Further, the above-mentioned broadband metamaterial noise reducer for ventilation ducts of household equipment is provided with an arc for reducing airflow noise at the entrance and/or exit of the broadband sound isolator or the broadband sound absorber arranged outside the duct. Shaped or trapezoidal diversion groove.

Further, the above-mentioned broadband metamaterial noise reducer for ventilation ducts of household equipment, the noise reducer can reduce the frequency range of 160 to 4000 Hz.

Further, the above-mentioned broadband metamaterial noise reducer for ventilation ducts of household equipment is further provided with a connection unit fixedly connected with the household equipment, such as a buckle, or an internal thread channel, or a nut fixing groove.

Compared with the prior art, the utility model has the advantages of:

1. The function of this utility model is based on structural design, does not contain traditional fiber porous materials, and has no potential harm to human health. Secondly, its internal structure does not have problems such as water accumulation and mildew, and has a long service life. It can be used in high-standard environments such as clean rooms and dust-free rooms. In addition, according to the different noise characteristics of different equipment, the working spectrum of the metamaterial noise reducer can be customized, and the sound absorption or sound insulation ability can be concentrated in the main frequency band of the noise, so as to reduce the overall noise more efficiently. For special scenarios such as high temperature resistance, the resonance unit of the noise reducer can be made of pure metal to meet the corresponding requirements.

2. The utility model combines the structural design with the narrow available space inside the home appliance, and makes targeted customization of the main noise energy frequency bands, which can achieve effective noise reduction starting from 200 Hz in a limited space within a few centimeters. In this way, the equipment noise can be reduced most efficiently without affecting other performances. In addition, the resonant unit of the present invention can use the same material as the internal connection position, so as to maintain the integrity of the original structure in appearance.

Description of drawings

The perspective view of Fig. 1, embodiment 1 noise reducer;

Fig. 2, the sectional view of embodiment 1 noise reducer;

Fig. 3, the perspective view of embodiment 2 denoising device;

Fig. 4, the sectional view of embodiment 2 noise reducers;

Among them, 1. The broadband sound isolator arranged outside the pipeline, 2. The cavity of the resonance unit, 3. The opening, 4. The diversion groove, 5. The connecting parts.

Detailed ways

A broadband supermaterial noise reducer for household equipment ventilation ducts, comprising a broadband sound isolator arranged outside the duct, a broadband sound absorber arranged outside the duct, or a combination of the broadband sound isolator and the broadband sound absorber arranged outside the duct.

Further, the above-mentioned broadband metamaterial noise reducer for the ventilation duct of household equipment, the broadband sound isolator arranged outside the duct is composed of several resonance units arranged side by side and independent of each other, and the resonance behavior of each resonance unit is Single-frequency and corresponding to a section of frequency in the broadband noise to be reduced, the resonance unit achieves the sound insulation effect by reflecting sound waves at the resonance frequency and nearby frequencies (theoretically, the resonance unit with a high quality factor achieves the sound insulation effect by reflecting the sound waves at the resonance frequency , but because the resonance unit actually has system dissipation in the process of reflecting sound waves, resulting in a decrease in the quality factor and an increase in the resonance bandwidth, the resonance unit reflects sound waves with a certain bandwidth near the resonance frequency); the resonance unit is set in the ventilation duct On the side wall, the resonance unit opens on the wall of the ventilation duct, or the resonance unit is arranged on the side wall of the ventilation duct, the resonance unit opens on the wall of the ventilation duct, and the opening of the resonance unit is provided with a mesh covering material;

The broadband sound absorber arranged outside the pipeline is composed of several parallel and independent resonance units. The resonance behavior of each resonance unit is single-frequency and corresponds to a frequency in the broadband noise to be reduced. The resonance unit passes The sound absorption effect is achieved by converting noise energy into heat energy and dissipating it; the resonance unit is set on the side wall of the ventilation duct, and the resonance unit opens on the wall of the ventilation duct, or the resonance unit is set on the side wall of the ventilation duct, and the resonance unit opens on the The pipe wall of the ventilation duct and the opening of the resonance unit are provided with a mesh covering material.

Further, the above-mentioned broadband supermaterial noise reducer for the ventilation duct of household equipment has several holes on the wall of the ventilation duct, which are respectively connected to the resonance unit of the broadband sound isolator or the broadband sound absorber arranged outside the duct. Corresponding.

Further, the above-mentioned broadband metamaterial noise reducer for ventilation ducts of household equipment, the resonance unit includes but is not limited to Fabry-Perot (quarter wavelength) resonators, Helm The Holtz resonator and the resonator whose cavity is of any shape.

Further, in the above-mentioned broadband metamaterial noise reducer for ventilation ducts of household equipment, several resonant units are arranged in a geometric shape with cavities with the same or different cross-sections, and each cavity is on a certain plane or curved surface or on a Bending and folding in three-dimensional space.

Further, the above-mentioned broadband metamaterial noise reducer for ventilation ducts of household equipment, the material of the metamaterial noise reducer includes but not limited to metal, plastic, wood, leather, paper, ceramics and any combination of the above six materials.

Further, the above-mentioned broadband supermaterial noise reducer for ventilation ducts of household equipment, the mesh covering materials include but not limited to metal mesh, sponge, woven cloth, paper, glass fiber cloth, acoustic perforated board and the above six materials any combination of .

Further, the above-mentioned broadband metamaterial noise reducer for ventilation ducts of household equipment is provided with an arc for reducing airflow noise at the entrance and/or exit of the broadband sound isolator or the broadband sound absorber arranged outside the duct. Shaped or trapezoidal diversion groove.

Further, the above-mentioned broadband metamaterial noise reducer for ventilation ducts of household equipment, the noise reducer can reduce the frequency range of 160 to 4000 Hz.

Further, the above-mentioned broadband metamaterial noise reducer for ventilation ducts of household equipment,

Example 1

The noise of the gas water heater mainly comes from the small centrifugal fan inside the water heater cabin. The air outlet is led to the outside through the exhaust pipe, and the air duct of the air inlet is exposed on the rear panel of the water heater, usually through the rear panel. The opening of the air duct supplies air to the fan, so that the air duct becomes the main source of fan noise spreading indoors. The main noise energy covers the frequency band of 200 to 3000 Hz, and the internal space is very compact. Through space and spectrum analysis, the corresponding broadband metamaterial noise reducer is designed at the air inlet of the fan. The design requires that the air inlet of the broadband metamaterial noise reducer should be consistent with the diameter of the original air inlet, thereby reducing the impact on ventilation efficiency, and The overall structure remains within the original horizontal area of the fan, without causing interference to other original structures.

The broadband metamaterial noise reducer for household equipment ventilation ducts adopted in this embodiment, as shown in Figures 1 and 2, is a broadband sound isolator 1 arranged outside the pipeline, and the resonance unit of the broadband sound isolator is Fabry-Perot resonance The cavity 2 of the resonance unit is folded back and forth on the same plane, the opening 3 of the resonance unit is a rectangular structure, and an arc-shaped guide groove 4 for reducing airflow noise is set at the entrance of the broadband sound isolator, which is arranged side by side and independent of each other The 10 resonant units form a rectangular sheet-shaped broadband sound isolator with a circular hole in the middle. The overall thickness of the broadband sound isolator is 22mm. There are several broadband sound isolators outside the pipe that are fixed to the gas water heater The connection part 5 that is connected, what this embodiment adopts is the internal thread channel; the broadband sound isolator outside the pipeline is sleeved on the pipeline that the air inlet of the fan goes out, and the pipeline is provided with 10 holes, which are respectively connected with each of the broadband sound isolators outside the pipeline. The openings of each resonance unit correspond to each other, covering the important noise frequency band of the gas water heater, forming a broadband sound isolator from 200 to 4000 Hz, and achieving a noise reduction effect of about 8 decibels on a single centrifugal fan.

Example 2

Under standard conditions, the power components of some equipment (including but not limited to pumps, compressors, motors, etc.) have significant noise problems, and the power components cannot be completely enclosed due to heat dissipation requirements, so that the power components become indoors. A major source of propagating noise, requiring effective noise reduction while maintaining ventilation. Traditional porous materials cannot efficiently reduce noise at low frequencies due to space constraints, and are prone to absorbing water and moisture, so they cannot be used as an effective means of noise reduction.

The broadband metamaterial noise reducer 2 used in the ventilation duct of household equipment used in this embodiment, as shown in Figures 3 and 4, is a broadband sound isolator arranged outside the duct, and the resonance unit is a cavity 2 with a rectangular cross section. Brie-Perot resonator, the resonance unit opening 3 is located on the side wall of the circular air outlet of the power component cabin with a diameter of 41 mm, and an arc-shaped guide groove 4 for reducing airflow noise is set at the entrance of the broadband sound isolator, resonance The cavity of the unit is folded back and forth on a plane, and consists of 10 resonant units arranged side by side and independent of each other to form a special-shaped quadrilateral, a sheet-shaped broadband sound isolator with a circular hole in the middle, which is set outside the pipe, and keeps the air outlet The diameter of the pipe remains unchanged, and the broadband sound isolator outside the pipe is set on the circular air outlet pipe of the power component cabin. There are 10 holes on the pipe, which correspond to the openings of each resonance unit in the broadband sound isolator outside the pipe. , The overall thickness of the broadband sound isolator is 24mm. The broadband sound isolator covers the main broadband noise band starting from 160 Hz, the noise reduction frequency is from 160 to 4000 Hz, and the average transmission loss exceeds 6 dB. Moreover, the noise reducer of this embodiment is entirely based on structural noise reduction rather than material noise reduction, so that it will not be affected by factors such as humidity and dust, and can maintain stable noise reduction performance for a long time.

Claims (8)

1. A broadband metamaterial noise reducer for household equipment ventilation ducts, characterized in that it comprises a broadband sound isolator arranged outside the pipeline, a broadband sound absorber arranged outside the pipeline, or a broadband sound isolator and a broadband sound absorber arranged outside the pipeline A combination of sound absorbers; the broadband sound isolator arranged outside the pipeline is composed of several resonant units arranged side by side and independent of each other. The resonance behavior of each resonant unit is single-frequency and corresponds to a segment of the broadband noise to be reduced. Frequency, the resonance unit achieves the sound insulation effect by reflecting sound waves at the resonance frequency and nearby frequencies; the resonance unit is set on the side wall of the ventilation duct, and the resonance unit opens on the ventilation duct wall, or the resonance unit is set on the side wall of the ventilation duct, The resonance unit is opened on the wall of the ventilation duct, and the opening of the resonance unit is provided with a mesh covering material; The broadband sound absorber arranged outside the pipeline is composed of several parallel and independent resonance units. The resonance behavior of each resonance unit is single-frequency and corresponds to a frequency in the broadband noise to be reduced. The resonance unit passes The sound absorption effect is achieved by converting noise energy into heat energy and dissipating it; the resonance unit is set on the side wall of the ventilation duct, and the resonance unit opens on the wall of the ventilation duct, or the resonance unit is set on the side wall of the ventilation duct, and the resonance unit opens on the The pipe wall of the ventilation duct and the opening of the resonance unit are provided with a mesh covering material. 2. The broadband supermaterial noise reducer for household equipment ventilation ducts according to claim 1, characterized in that several holes are arranged on the ventilation duct wall, which are respectively connected with the broadband sound isolators outside the pipeline or arranged outside the pipeline. Corresponds to the opening of the resonant unit of the broadband sound absorber. 3. The broadband metamaterial noise reducer for household equipment ventilation ducts according to claim 1, wherein the resonance unit is a Fabry-Perot resonator, a Helmholtz resonator capable of isolating or absorbing a certain frequency noise. The resonator and the cavity are resonators with arbitrary shapes. 4. The broadband metamaterial noise reducer for household equipment ventilation ducts according to claim 1, characterized in that several resonant units are arranged in geometric shapes with the same or different cavities in cross section, and each cavity is in the Bending and folding on a plane or curved surface or in three-dimensional space. 5. The broadband metamaterial noise reducer for household equipment ventilation duct according to claim 1, characterized in that, at the entrance and/or outlet of the broadband sound isolator outside the pipeline or the broadband sound absorber outside the pipeline Arc or trapezoidal diversion slots are provided to reduce airflow noise. 6. The broadband metamaterial noise reducer for ventilation ducts of household equipment according to claim 1, wherein the frequency range of noise reduction by the noise reducer is 160 to 4000 Hz. 7. The broadband metamaterial noise reducer for household equipment ventilation ducts according to claim 1, characterized in that, the noise reducer is also provided with a connection unit fixedly connected with household equipment. 8. The broadband supermaterial noise reducer for ventilation ducts of household equipment according to claim 7, wherein the connection unit is a buckle, or an internal thread channel, or a nut fixing groove.

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