CN212179186U - Active noise reduction device and air conditioner - Google Patents
Active noise reduction device and air conditioner Download PDFInfo
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- CN212179186U CN212179186U CN202020639703.XU CN202020639703U CN212179186U CN 212179186 U CN212179186 U CN 212179186U CN 202020639703 U CN202020639703 U CN 202020639703U CN 212179186 U CN212179186 U CN 212179186U
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- noise reduction
- reduction device
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Abstract
The utility model discloses an active noise reduction device and air conditioner, this active noise reduction device includes: a penetrating part which penetrates in the wind direction of the noise source; a fixing portion located inside the through portion and fixed to the through portion; a noise reduction assembly fixed to the fixing portion, the noise reduction assembly including: a controller; the reference microphone is connected with the controller and used for collecting noise signals of the noise source and sending the noise signals to the controller; and the loudspeaker is connected with the controller, is arranged on one side of the reference microphone away from the noise source and is driven by the controller to emit a noise reduction signal in an anti-phase state with the noise signal. The utility model discloses effectively fall the noise source and make an uproar, and the device simple structure, easy installation and maintenance.
Description
Technical Field
The utility model relates to an air conditioning technology field especially relates to a device and air conditioner of making an uproar falls in air pipe's active source for air conditioner.
Background
With the social progress and the improvement of the living standard of people, the noise from the air inlet and the air outlet of air conditioners such as a central air conditioner, a fresh air system and the like becomes one of the main noise sources in the indoor environment, and the daily life of people is influenced.
There are two common methods of noise reduction, passive and active. The passive noise reduction mainly utilizes the isolation and sound absorption performance of materials to reduce noise, is more effective to medium and high frequency noise, and the effect of reducing low frequency noise by passive noise reduction means is not obvious. Active Noise reduction (i.e., Active Noise Control, ANC) is a Noise Active Control technology based on a coherent superposition of sound waves, which introduces a secondary sound source into a sound field, and utilizes an Active Noise reduction device to generate a secondary Noise with a phase opposite to that of an original Noise, and the secondary Noise is coherently cancelled with the original Noise, so as to achieve the purpose of Noise suppression, and for low-frequency Noise, the Active Noise reduction is easier to Control and is more effective for reducing the low-frequency Noise.
Because air conditioners such as a fresh air system and the like are provided with a longer ventilation pipeline, running noise (such as fresh air fan noise generated by a fresh air fan and wind-driven noise generated when air flows) is mainly transmitted along the ventilation pipeline, and the low-frequency part of the noise transmitted along the ventilation pipeline has larger energy, so that feasibility is provided for implementing active noise reduction control in the ventilation pipeline.
How to utilize active noise control to realize noise suppression in ventilation ducts so as to improve user experience and comfort level is a problem which is constantly concerned about.
Disclosure of Invention
An embodiment of the utility model provides an active noise reduction device and air conditioner through falling this active noise reduction device setting in air pipe, falls to making an uproar to air pipe internal noise source, and the device simple structure, easily installation and maintenance.
In order to realize the purpose of the utility model, the utility model adopts the following technical scheme to realize:
the present invention relates to an active noise reduction device including a through portion, a fixing portion, and a noise reduction unit for reducing noise from a noise source.
In some embodiments of the present application, the noise reduction assembly further comprises: the reference microphone is arranged in one end of the split cavity with a smaller sectional area; an opening is formed at one end of the split cavity with a larger sectional area, the loudspeaker is arranged at the opening, and the sound generating part of the loudspeaker faces the outer side of the split cavity; wherein the speaker is mounted to the fixing portion.
In some embodiments of the present application, the controller is disposed within the split cavity between the reference microphone and the speaker.
In some embodiments of the present application, the split cavity has formed thereon: a plurality of sound transmitting holes provided at one end of the fixed chamber where the sectional area is smallest, and surrounding the reference microphone.
In some embodiments of the present application, a sound emission plane of a sound emission portion of the speaker is parallel to a downstream plane of an end of the through portion away from the noise source, and a distance between the sound emission plane and the downstream plane is equal to or greater than zero.
In some embodiments of the present application, the through portion is cylindrical with a circular cross section; the fixing portion includes: a frame to which the speaker is fixed; and one end of each support leg is abutted to the outer circumferential wall of the frame, and the other end of each support leg is abutted to the inner circumferential wall of the through part.
In some embodiments of the present application, the through portion is integrally formed with the fixing portion.
In some embodiments of the present application, the frame is annular and has an internal thread formed on an inner circumferential wall thereof; and an external thread matched with the internal thread is formed on the outer circumferential wall of the loudspeaker.
In some embodiments of the present application, the reference microphone is wrapped with a wind, moisture and sound permeable material.
In some embodiments of the present application, the present application further relates to an air conditioner, which includes a ventilation duct and an active noise reduction device disposed on the ventilation duct for reducing noise at an inlet and an outlet in the ventilation duct.
In some embodiments of this application, this air conditioner is new fan, new fan still includes the fan, air pipe has the return air inlet, the active device of making an uproar that falls is installed air pipe's return air inlet department, the reference microphone of the active device of making an uproar that falls is located the speaker and keeps away from one side of fan.
In some embodiments of this application, this air conditioner is new fan, and it still includes the fan, air pipe has the air outlet, active noise reduction device installs air pipe's air outlet department, active noise reduction device's reference microphone is located the speaker and is close to one side of fan.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when read in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a structural diagram of an embodiment of an active noise reduction apparatus provided by the present invention;
fig. 2 is a partial exploded view of an embodiment of an active noise reducer according to the present invention;
fig. 3 is a rear view of an embodiment of an active noise reducer provided by the present invention;
3 fig. 34 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 a 3- 3 a 3 in 3 fig. 33 3. 3
Reference numerals: 100-active noise reduction means; 10-a through-section; 20-a fixed part; 21-a frame; 22-a foot; 30-a noise reduction assembly; 31-a split cavity; 311-sound-transparent holes; 32-a controller; 33-a reference microphone; 34-loudspeaker.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. In the description of the present invention, it is to be understood that the terms "front", "back", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1 and 2, the active noise reduction device 100 according to the present application includes a through portion 10, a fixing portion 20, and a noise reduction unit 30, wherein the fixing portion 20 is fixed to the through portion 10, and the noise reduction unit 30 is indirectly fixed to the through portion 10 by the fixing portion 20, and is configured to reduce noise from a noise source.
In the present application, the active noise reducer 100 is mainly used for reducing the noise of the operation noise in the ventilation duct.
In the wind direction in the ventilation duct, "front" means a side close to the return air inlet, and "rear" means a side close to the air outlet.
As follows, with reference to fig. 1 to 4, the active noise reduction assembly 100 is installed between the air outlets of the ventilation duct.
[ penetration part ]
When the active noise reducer 100 is mounted at the air outlet of the ventilation duct, the through portion 10 should communicate with the ventilation duct.
For better communication with the ventilation duct, the through-section 10 may be designed as a cylinder, for example with a circular cross-section, the cylindrical through-section 10 penetrating in the wind direction of the ventilation duct.
When the through portion 10 is connected to the ventilation duct, one end of the through portion 10, which is used for connecting the air outlet of the ventilation duct, may be designed to be a flared opening, so that the air outlet of the ventilation duct can be conveniently extended into the flared opening in an interference manner.
Such a securing may facilitate easy removal of the active noise reducer 100 from the ventilation duct when the active noise reducer 100 is not in use or is being replaced.
[ noise reduction Assembly ]
The noise reduction assembly 30 includes a controller 32, a reference microphone 33 and a speaker 34, with the reference microphone 33 and the speaker 34 being connected to the controller 32, respectively.
The reference microphone 33 is used for collecting a noise signal of a noise source and sending the noise signal to the controller 32, the controller 32 processes the noise signal and outputs a noise signal with an opposite phase to the loudspeaker 34, so that the loudspeaker 34 is driven to send a noise reduction signal with an opposite phase to the noise signal, and the noise signal and the noise reduction signal are superposed, so that the noise signal can be coherently offset, and a noise reduction effect is achieved.
In the present application, the controller 32 is a controller designed in advance according to a test, and is used for reducing noise of the fresh air fan and the wind flow noise in the ventilation duct.
The reference microphone 33 and the speaker 34 are arranged in front and rear in the wind direction, i.e., the speaker 34 is disposed at the rear side of the reference microphone 33.
Wedge-shaped cavity
To provide the reference microphone 33 and the speaker 34, the noise reduction assembly 30 further includes a split cavity 31. The reference microphone 33 is fixed in the end of the split cavity 31 with a smaller cross-sectional area (i.e. the front end of the split cavity 31), the end of the split cavity 31 with a larger cross-sectional area (i.e. the rear end of the split cavity 31) is opened with an opening (not shown), the speaker 34 is fixed at the opening and the sound-emitting part of the speaker faces the outside of the split cavity 31.
The front end sectional area of the split cavity 31 is smaller, and the sectional area of the split cavity 31 gradually increases from the front end to the rear end, so when the noise reduction assembly 30 is arranged at the air outlet of the ventilation duct, the front end of the split cavity 31 is the windward side, the front end has small airflow resistance, the airflow direction cannot change greatly, the airflow speed is still faster, the noise signal collected by the reference microphone 33 cannot be influenced, and larger aerodynamic noise cannot be generated.
Controller
The controller 32 may be disposed within the split cavity 31 between the reference microphone 33 and the speaker 34 to facilitate the wiring of the reference microphone 33 and the speaker 34, respectively, to the controller 32.
The controller 32 separates the reference microphone 33 from the loudspeaker 34, so as to avoid mutual influence between the reference microphone 33 and the loudspeaker 34, and reduce the influence of the signal emitted by the loudspeaker 34 on the signal collected by the reference microphone 33; and meanwhile, the controller 32 is prevented from occupying extra space, and only the space in the original split cavity 31 is occupied.
Of course, the controller 32 may be installed outside the through-hole 10, and in this case, it is necessary to arrange connection lines between the controller 32 and the reference microphone 33 and the speaker 34, respectively.
Reference microphone
A plurality of air holes 311 are formed at one end of the wedge-shaped cavity 31 with a smaller cross section, and the reference microphone 33 is surrounded by the plurality of air holes 311, so that the operation noise (such as noise generated by a fresh air fan, noise generated by air flow and the like) in the ventilation pipeline can enter the wedge-shaped cavity 31 and be collected by the reference microphone 33.
In addition, the reference microphone 33 is wrapped with a wind-proof, moisture-proof and sound-transmitting material, which prevents the reference microphone 33 from being damaged by the moist air flow having a large flow velocity entering the wedge-shaped cavity 31 through the plurality of air holes 311.
The windproof and dampproof sound-transmitting material can be sound-transmitting sponge, melamine foam or polyurethane foam and the like, has good sound absorption, flame retardance, heat insulation, humidity and heat stability and other properties, can absorb part of noise signals of a front-end noise source while ensuring the normal use of the reference microphone 33, and is favorable for improving the noise reduction effect.
Loudspeaker
The speaker 34 is mounted to the fixing portion 20, thereby achieving mounting of the entire noise reduction assembly 30 to the fixing portion 20.
The speaker 34 may be a closed box speaker. The controller 32 itself should drive the speaker 34 through the power amplifier if the output of the inverted noise signal is insufficient to drive the speaker 34 to emit the inverted noise reduction sound.
Since the longitudinal direction of the tubular through-portion 10 coincides with the wind direction of the ventilation duct, it is necessary to ensure that the sound emission plane of the sound emission portion of the speaker 34 is perpendicular to the wind direction in the ventilation duct when the speaker 34 is fixed to the fixing portion 20. The downstream plane of the end of the penetrating portion 10 remote from the front end noise source is also perpendicular to the wind direction in the ventilation duct.
Since the sound emitted from the speaker 34 can be diffused at the sound emission plane, the distance d between the sound emission plane of the speaker 34 and the downstream plane is equal to or greater than 0 in order to ensure that the noise-reduced sound can be output at the downstream plane of the through portion 10.
In some embodiments, d is greater than 0, such that the sound emitted through the sound emitting plane of speaker 34 diverges to achieve coherent cancellation with the noise signal of the noise source at the downstream plane of pass-through 10.
[ fixed part ]
As described above, the speaker 34 is mounted to the fixing portion 20. Fixing portion 20 is connected to inside of penetrating portion 10.
As shown in fig. 1, the fixing portion 20 includes a frame 21 and a plurality of legs 22 connected to the frame 21, the frame 21 is annular, the legs 22 are radially wound around an outer peripheral surface of the frame 21, one ends of the legs 22 abut against an inner peripheral wall of the frame 21, and the other ends of the legs 22 abut against an inner peripheral wall of the through portion 10.
The fixing portion 20 may be integrally formed with the penetrating portion 10.
In order to fix the speaker 34 to the fixing portion 20, an inner circumferential wall of the frame 21 is formed with an internal thread, an outer circumferential wall of the speaker 34 adjacent to the sound emitting portion is formed with an external thread, and the internal thread of the frame 21 and the external thread of the speaker 34 are engaged to fix the speaker 34 to the fixing portion 20.
A plurality of bayonets may be formed in the inner circumferential wall of the frame 21, and correspondingly, snaps corresponding to the plurality of bayonets may be provided in the outer circumferential wall of the speaker 34, so that the speaker 34 and the frame 21 may be engaged and fixed when the snaps are engaged with the bayonets.
This type of attachment facilitates maintenance and replacement of the noise reduction assembly 30 when the noise reduction assembly 30 is damaged.
It should be noted that the air conditioner in this application refers to an air conditioning product with a duct structure, such as a fresh air machine, a duct machine, a household cabinet air conditioner, and the like.
[ New Fan ]
The installation position of the active noise reduction device 100 is described by taking a fresh air machine as an example.
For a fresh air machine, which has a housing, a fan and a ventilation duct installed in the housing, and the ventilation duct has an air outlet and an air return inlet, the active noise reduction assembly 100 may be respectively disposed between the fan and the air outlet and/or between the fan and the air return inlet. The active noise reduction device 100 is installed at the position of the fan and the air return port, wherein the reference microphone 33 of the active noise reduction device 100 is located on one side, far away from the fan, of the loudspeaker 34, namely the reference microphone 33 is located on the upstream of a ventilation pipeline between the fan and the air return port, the loudspeaker 34 is located on the downstream of the ventilation pipeline between the fan and the air return port, noise reduction is conveniently carried out on operation noise at the position of the air return port, the fan blows in the ventilation pipeline between the fan and the air outlet, then noise reduction is further carried out on the noise at the position of the air outlet, and the.
Compared with the prior art, the active noise reduction assembly 100 is only arranged on one side, the scheme can not only realize noise reduction on pneumatic noise in front of the fan and noise propagated by the fan towards the direction of the air return port, but also realize noise reduction on the pneumatic noise behind the fan and the noise propagated by the fan towards the direction of the air outlet, and the noise reduction effect is better.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or that equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the present invention, which is claimed.
Claims (10)
1. An active noise reduction device, comprising:
a penetrating part which penetrates in the wind direction of the noise source;
a fixing portion located inside the through portion and fixed to the through portion;
a noise reduction assembly fixed to the fixing portion, the noise reduction assembly including:
a controller;
the reference microphone is connected with the controller and used for collecting noise signals of the noise source and sending the noise signals to the controller;
and the loudspeaker is connected with the controller, is arranged on one side of the reference microphone, which is far away from the noise source, and is driven by the controller to send out a noise reduction signal in a phase opposite to that of the noise signal.
2. The active noise reduction device of claim 1, wherein the noise reduction assembly further comprises:
the reference microphone is arranged in one end of the split cavity with a smaller sectional area; an opening is formed at one end of the split cavity with a larger sectional area, the loudspeaker is arranged at the opening, and the sound generating part of the loudspeaker faces the outer side of the split cavity;
the speaker is mounted to the fixing portion.
3. The active noise reduction device of claim 2, wherein the controller is disposed within the split cavity between the reference microphone and the speaker.
4. The active noise reduction device of claim 2, wherein the split cavity has formed thereon:
a plurality of sound-transmitting holes disposed at one end of the wedge-shaped cavity having a smaller cross-sectional area and surrounding the reference microphone.
5. The active noise reduction device according to claim 2, wherein a sound emission plane of a sound emission portion of the speaker is parallel to a downstream plane of an end of the through portion away from the noise source, and a distance between the sound emission plane and the downstream plane is equal to or greater than zero.
6. The active noise reduction device according to claim 1, wherein the through portion is cylindrical with a circular cross section; the fixing portion includes:
a frame to which the speaker is fixed;
and one end of each support leg is abutted to the outer circumferential wall of the frame, and the other end of each support leg is abutted to the inner circumferential wall of the through part.
7. The active noise reduction device of claim 6, wherein the frame is annular and has an internal thread formed on an inner circumferential wall thereof; and an external thread matched with the internal thread is formed on the outer circumferential wall of the loudspeaker.
8. The active noise reduction device of claim 1, wherein the reference microphone is wrapped with a wind, moisture and sound permeable material.
9. The utility model provides an air conditioner, its includes air pipe, its characterized in that still includes:
an active noise reducer as claimed in any one of claims 1 to 8 mounted on the ventilation duct.
10. The air conditioner of claim 9, wherein the air conditioner is a fresh air blower, the fresh air blower comprising:
the fan is positioned in the ventilation pipeline, and the ventilation pipeline is provided with an air return inlet and an air outlet;
the active noise reduction device is arranged at an air return port of the ventilation pipeline, and a reference microphone of the active noise reduction device is positioned on one side of the loudspeaker far away from the fan; and/or
The active noise reduction device is arranged at an air outlet of the ventilation pipeline, and a reference microphone of the active noise reduction device is positioned on one side of the loudspeaker close to the fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020639703.XU CN212179186U (en) | 2020-04-24 | 2020-04-24 | Active noise reduction device and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020639703.XU CN212179186U (en) | 2020-04-24 | 2020-04-24 | Active noise reduction device and air conditioner |
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| Publication Number | Publication Date |
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| CN212179186U true CN212179186U (en) | 2020-12-18 |
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| CN202020639703.XU Active CN212179186U (en) | 2020-04-24 | 2020-04-24 | Active noise reduction device and air conditioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112771606A (en) * | 2020-12-31 | 2021-05-07 | 华为技术有限公司 | Automobile air conditioner noise control system and method and related vehicle-mounted equipment |
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2020
- 2020-04-24 CN CN202020639703.XU patent/CN212179186U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112771606A (en) * | 2020-12-31 | 2021-05-07 | 华为技术有限公司 | Automobile air conditioner noise control system and method and related vehicle-mounted equipment |
| WO2022141562A1 (en) * | 2020-12-31 | 2022-07-07 | 华为技术有限公司 | Vehicle air conditioner noise control system and method, and related vehicle-mounted device |
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