Array type active and passive composite silencing device suitable for heating and ventilation system

Abstract

The utility model discloses an array type active and passive composite silencing device suitable for a heating and ventilation system. The array type active and passive composite silencing device comprises an array type passive silencer arranged at an air opening of the heating and ventilation system and an active silencing system used in cooperation with the array type passive silencer. The array type passive silencer comprises a shell protection cover arranged at the air opening in a sleeving mode, and a plurality of columnar sound absorbers distributed side by side in an array mode and a keel support used for fixing the columnar sound absorbers are arranged in the shell protection cover. The active noise elimination system comprises a sensor used for collecting noise changes in the shell protection cover, an actuator used for eliminating noise in the shell protection cover and a controller used in cooperation with the actuator. The device provided by the utility model can eliminate noise generated when the heating and ventilation system works so as to provide a healthy and comfortable living environment.

Description

Technical Field

[0001] The utility model belongs to the technical field of silencing, and in particular relates to an array type active and passive composite silencing device suitable for a heating and ventilation system. Background Art

[0002] The HVAC system, as an important guarantee for a healthy and comfortable indoor physical environment, has become an indispensable and important part of modern buildings. However, the operation of various mechanical equipment and air circulation in the HVAC system also brings a series of noise pollution problems to the surrounding environment.

[0003] Patent document CN 113654232A discloses a sound-absorbing structure suitable for air outlets of a heating and ventilation system, wherein the sound-absorbing structure is formed by enclosing a plurality of sound-absorbing units, and the center of the enclosed unit is the air outlet; the sound-absorbing unit comprises an outer sound-absorbing structure and an inner sound-absorbing structure arranged in the outer sound-absorbing structure; the outer sound-absorbing structure comprises a closed shell, a first back cavity is formed in the closed shell, and a micro-perforated plate is provided on the side of the closed shell close to the air outlet; the inner sound-absorbing structure comprises a plurality of semi-enclosed shells which are distributed at intervals and whose openings face the air outlet, a slit is formed between adjacent semi-enclosed shells, and a plurality of semi-enclosed shells are provided on the side of the micro-perforated plate with a closed plate for forming a second back cavity.

[0004] Patent document CN110822206A discloses an ultra-open high-efficiency ventilation sound absorption unit, including two first and second split-tube resonant cavities symmetrically arranged side by side, each split-tube resonant cavity is composed of an inner frame and an outer frame, and the whole is in the shape of a "U". The left and right sides of the first and second split-tube resonant cavities are equipped with cover plates, so as to form a sound absorption channel between the inner and outer frames, and the first and second split-tube resonant cavities are also provided with "I"-shaped horizontal sound absorption narrow slits. It is suitable for high-efficiency absorption of low-frequency sound, but the sound absorption frequency band is narrow. Utility Model Content

[0005] The utility model aims to provide an array type active and passive composite silencing device suitable for a heating and ventilation system, which can eliminate the noise generated when the heating and ventilation system is working, so as to provide a healthy and comfortable living environment.

[0006] In order to achieve the purpose of the utility model, an array type active and passive composite muffler device suitable for a HVAC system is provided, comprising an array type passive muffler arranged at the air outlet of the HVAC system, and an active muffler system used in conjunction with the array type passive muffler; wherein,

[0007] The array passive muffler comprises an outer shell protective cover sleeved at the air outlet, wherein a plurality of columnar sound absorbers arranged in an array are arranged in the outer shell protective cover, and a keel bracket for fixing the plurality of columnar sound absorbers, and a gap is left between two adjacent columnar sound absorbers as an air flow channel for the air flow entering the air outlet to pass through;

[0008] The active noise reduction system includes a sensor for collecting noise changes in the outer shell protective cover, an actuator for eliminating noise in the outer shell protective cover, and a controller used in conjunction with the actuator. The controller generates a control instruction for controlling the output power of the actuator based on the noise changes collected in the outer shell protective cover, and sends it to the actuator.

[0009] The utility model eliminates the medium and high frequency noises generated by the fan by means of columnar sound absorbing bodies arranged in a side-by-side array, and at the same time cooperates with an active noise elimination system to destructively interfere with weak low frequency noise, thereby completing the low frequency noise elimination.

[0010] Specifically, the sensor includes a reference sensor arranged at an airflow inlet of the array passive muffler and an error sensor arranged at an airflow outlet of the array passive muffler.

[0011] Specifically, the actuator uses a speaker to output sound waves for offsetting low-frequency noise according to control instructions generated by the controller.

[0012] Specifically, the actuators are provided in plurality, and the plurality of actuators are arranged on the inner wall of the housing protective cover according to the noise situation, thereby improving the effect of counteracting low-frequency noise.

[0013] Specifically, a plurality of actuators are arranged in a ring in the outer shell protective cover with the length direction of the columnar sound absorbing body as the center line.

[0014] Specifically, the columnar sound absorbing body is made of a porous sound absorbing material filled with glass fiber wool.

[0015] Specifically, the columnar sound absorber adopts a resonance sound absorption structure, a microporous sound absorption structure or an acoustic metamaterial structure.

[0016] Specifically, the length direction of the columnar sound absorber is consistent with the flow direction of the airflow in the outer shell protective cover, thereby increasing the response time of the columnar sound absorber to absorb noise.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The medium and high frequency noise of the HVAC system is absorbed by the columnar sound absorbers arranged in a side-by-side array, and the low frequency noise in the entire array passive silencer is destructively interfered by the matching active silencer system, thereby completing the noise silencing work of the entire HVAC system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of an array type active and passive composite silencing device provided in this embodiment;

[0020] In the figure, 1. array passive silencer; 2. outer shell protective cover; 3. columnar sound absorber; 4. keel bracket; 5. reference sensor; 6. controller; 7. actuator; 8. error sensor. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0022] like Figure 1 As shown, the array type active and passive composite silencer device provided in this embodiment includes an array type passive silencer 1 and an active silencer system.

[0023] Among them, the array passive silencer 1 includes an outer shell protective cover 2, a columnar sound absorber 3 and a keel bracket 4. The outer shell protective cover 2 includes a square tube type, a round tube type or a special-shaped tube type according to the shape of the air outlet. The material is usually a metal material such as steel and aluminum. The surface of the protective cover usually needs to be galvanized or other anti-rust treatments. A plurality of columnar sound absorbers 3 of consistent specifications are arranged in the outer shell protective cover 2, and are distributed in a side-by-side array, and the columnar sound absorbers 3 are flexibly adjusted in the width and height directions. The sound absorption principle of the columnar sound absorber 3 includes but is not limited to porous sound absorbing materials such as glass fiber cotton, and the structure adopts a resonant sound absorbing structure, a microporous sound absorbing structure and an acoustic metamaterial design.

[0024] The keel bracket 4 is made of metal, and its two ends are connected and fixed to the outer shell protective cover 2. The connection method includes welding, riveting or bolting. The middle part is fixed at intervals on the top or tail of the columnar sound absorber 3, so as to achieve the function of fixing the columnar sound absorber 3, so that it is evenly distributed in an array inside the outer shell protective cover 2, and a gap is left between two adjacent columnar sound absorbers 3 as an airflow channel for air to enter through the air outlet.

[0025] The active noise reduction system comprises a reference sensor 5, a controller 6, an actuator 7 and an error sensor 8. Depending on the actual application conditions, multiple sets of active noise reduction systems may be installed at multiple locations on the inner surface of the outer shell protective cover (2).

[0026] Among them, the reference sensor 5 is used to collect the noise signal at the noise inlet of the array passive silencer 1 and feed it back to the controller 6, the error sensor 8 is used to collect the noise signal at the noise outlet of the array passive silencer 1 and feed it back to the controller 6, and the actuator 7 is usually a speaker sound source, located between the reference microphone 5 and the error microphone 8, and generates sound waves according to the excitation of the controller 6 to offset the noise.

[0027] At the same time, the controller will also make timely adjustments based on the noise conditions at the silencer outlet collected by the error sensor 8 to further optimize the noise control effect; the silencer principle of the array-type active and passive composite silencer device involved in the utility model is: in the process of noise entering from the array silencer inlet to exiting from the silencer outlet, the array silencer uses various principles such as porous sound absorption structure, cavity resonance sound absorption structure and film and thin plate sound absorption structure to reduce medium and high frequency noise, while the active silencer system uses active noise control technology to further reduce low frequency noise. The combination of active and passive composite silencer technologies realizes high-efficiency silencer and noise reduction in the entire frequency band, which has great application value and potential.

[0028] In addition, the terms "upper", "lower", "inner", "outer", "front", "rear" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Unless otherwise specifically stated, the relative steps, numerical expressions and values ​​of the components and steps described in these embodiments do not limit the scope of the present invention.

[0029] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made according to the structure, characteristics and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

[0030] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above-mentioned embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An array type active and passive composite silencing device suitable for a HVAC system, characterized in that: It includes an array type passive silencer arranged at the air outlet of the HVAC system, and an active silencer system used in conjunction with the array type passive silencer; wherein, The array passive muffler comprises an outer shell protective cover sleeved at the air outlet, wherein a plurality of columnar sound absorbers arranged in an array are arranged in the outer shell protective cover, and a keel bracket for fixing the plurality of columnar sound absorbers, and a gap is left between two adjacent columnar sound absorbers as an air flow channel for the air flow entering the air outlet to pass through; The active noise reduction system includes a sensor for collecting noise changes in the outer shell protective cover, an actuator for eliminating noise in the outer shell protective cover, and a controller used in conjunction with the actuator. The controller generates a control instruction for controlling the output power of the actuator based on the noise changes collected in the outer shell protective cover, and sends it to the actuator.

2. The array type active and passive composite silencing device suitable for HVAC system according to claim 1, characterized in that: The sensor comprises a reference sensor arranged at an airflow inlet of the array passive muffler and an error sensor arranged at an airflow outlet of the array passive muffler.

3. The array type active and passive composite silencing device suitable for HVAC system according to claim 1, characterized in that: The actuator adopts a loudspeaker, and outputs a sound wave for offsetting low-frequency noise according to a control instruction generated by a controller.

4. The array type active and passive composite silencing device suitable for HVAC system according to claim 1 or 3, characterized in that: There are multiple actuators, which are arranged on the inner wall of the housing protection cover according to the noise situation.

5. The array type active and passive composite silencing device suitable for HVAC system according to claim 1, characterized in that: The columnar sound absorbing body is made of a porous sound absorbing material filled with glass fiber wool.

6. The array type active and passive composite silencing device suitable for HVAC system according to claim 1, characterized in that: The columnar sound absorber adopts a resonance sound absorption structure, a microporous sound absorption structure or an acoustic metamaterial structure.

7. The array type active and passive composite silencing device suitable for HVAC system according to claim 1, characterized in that: The length direction of the columnar sound absorber is consistent with the flow direction of the airflow in the outer shell protective cover.

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