CN110843831A - Distribution box, air conditioner pipe system and air conditioner of making an uproar fall - Google Patents
Distribution box, air conditioner pipe system and air conditioner of making an uproar fall Download PDFInfo
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- CN110843831A CN110843831A CN201911127605.6A CN201911127605A CN110843831A CN 110843831 A CN110843831 A CN 110843831A CN 201911127605 A CN201911127605 A CN 201911127605A CN 110843831 A CN110843831 A CN 110843831A
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- 238000004378 air conditioning Methods 0.000 claims description 14
- 239000011358 absorbing material Substances 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 6
- 230000005284 excitation Effects 0.000 claims description 2
- 230000035939 shock Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 17
- 238000007789 sealing Methods 0.000 description 13
- 230000005540 biological transmission Effects 0.000 description 8
- 238000009423 ventilation Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000003584 silencer Effects 0.000 description 2
- 230000000954 anitussive effect Effects 0.000 description 1
- 229940124584 antitussives Drugs 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- ZZVUWRFHKOJYTH-UHFFFAOYSA-N diphenhydramine Chemical compound C=1C=CC=CC=1C(OCCN(C)C)C1=CC=CC=C1 ZZVUWRFHKOJYTH-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D27/00—Heating, cooling, ventilating, or air-conditioning
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
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- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a noise reduction distribution box, an air conditioner pipeline system and an air conditioner, wherein the noise reduction distribution box comprises a reference microphone connected with an air inlet end of a distribution box body through a first connecting part, a first through hole is formed in the first connecting part, a secondary loudspeaker is connected with an air outlet end through a second connecting part, and a second through hole is formed in the second connecting part; the error microphone is connected with the air outlet end through a third connecting part, and a third through hole is formed in the third connecting part. The reference microphone positioned at the air inlet end monitors a noise signal in real time through the first through hole and transmits the noise signal to the controller, the controller forms a control signal to push the secondary loudspeaker to emit an inverted sound wave and transmits the inverted sound wave to the distribution box through the second through hole so as to counteract the noise transmitted from the air inlet end, the error microphone monitors the noise counteracting effect in real time through the third through hole and transmits the counteracting effect back to the controller, and the controller iteratively adjusts the output control signal according to a control result so as to inhibit the noise at the air outlet end position.
Description
Technical Field
The invention relates to the technical field of noise reduction, in particular to a noise reduction distribution box, an air conditioner pipeline system and an air conditioner.
Background
With the progress of modern society and the improvement of living standard of people, the problem of noise pollution is increasingly prominent, wherein, the noise of the ventilation pipeline system is a common noise source, such as the air outlet of a central air conditioning system, the radiation sound of the air inlet/outlet of a ship ventilation system and the like. Along with the development of train technology, the requirement on the comfort of passengers is higher and higher, and the control of the pipe orifice radiation noise of an air conditioning pipeline system on a train has important significance for improving the comfort of the passengers.
The air conditioner pipeline noise mainly comprises air conditioner fan noise and secondary noise generated by air flow, wherein the secondary noise generated by air flow can obtain a good noise reduction effect through passive sound absorption of the air distribution pipeline, and the noise of the air conditioner fan has more low-frequency noise components, and the noise reduction effect of the passive sound absorption method of the air distribution pipeline on the low-frequency noise is not ideal, so that the main noise source in the carriage comes from the air conditioner fan noise.
Chinese patent application No. 201310184657.3 discloses an active muffler for a ventilation duct system, which is configured by providing components such as a speaker unit, an error sensor unit, and a speaker power amplifier board card in a ventilation duct, but the structure of the active muffler has the following problems: 1. the components such as the loudspeaker unit, the error sensor unit, the loudspeaker power amplifier board card and the like which form the active silencer are required to be arranged on the outer side of the ventilation pipeline, so that the pipeline of the train air-conditioning system is not provided with enough space, and the whole structural design of the train is required to be changed; 2. in order to uniformly distribute air, the train air distribution pipeline is currently designed to be a non-uniform pipeline with a large upstream sectional area and a small downstream sectional area, a through hole structure is uniformly arranged below the pipeline to exhaust air, and an independent air outlet is not arranged, so that the active silencer cannot obtain an obvious noise reduction effect after being applied to the train air distribution pipeline.
The application number is 201821773881.0's patent application discloses a distribution box of making an uproar falls in train air conditioner initiative, including the distribution box body, the speaker, error microphone and controller, wherein the speaker sets up on distribution box body air inlet portion, error sensor sets up on distribution box body air outlet portion, wherein error microphone real-time supervision noise signal, and with signal transmission to controller, the controller forms control signal and transmits to the speaker through the operation of built-in active control algorithm, the speaker transmission control sound wave offsets the noise that comes in from the air inlet portion thereby makes the noise of air outlet portion position obtain suppressing. Although the product has simple structure and low cost, the control effect and the stability are to be improved.
Disclosure of Invention
The invention aims to provide a noise reduction distribution box, an air conditioner pipeline system and an air conditioner, which are used for improving the control effect and stability of noise reduction.
In order to solve the above technical problem, according to a first aspect, an embodiment of the present invention provides a noise reduction distribution box, including:
the distribution box comprises a distribution box body, wherein the distribution box body is provided with an air inlet end and an air outlet end;
the reference microphone is connected with the air inlet end through a first connecting part, and a first through hole is formed in the first connecting part;
the secondary loudspeaker is connected with the air outlet end through a second connecting part, and a second through hole is formed in the second connecting part;
the error microphone is connected with the air outlet end through a third connecting part, and a third through hole is formed in the third connecting part;
a controller communicatively coupled to the reference microphone, the secondary speaker, and the error microphone.
In the embodiment of the invention, a reference microphone at the air inlet end in a distribution box monitors a noise signal in the distribution box in real time through a first through hole and transmits the noise signal to a controller, the controller forms a control signal to push a secondary loudspeaker to emit an inverse sound wave through a built-in active control algorithm according to the parameters of a secondary channel and the characteristics of a primary noise signal, the inverse sound wave is transmitted to the distribution box through a second through hole so as to counteract the noise transmitted from the air inlet end, an error microphone at the air outlet end position monitors the noise counteracting effect in real time through a third through hole and transmits the noise counteracting effect back to the controller, and the controller iteratively adjusts an output control signal according to a control result so as to inhibit the noise at the air outlet end position, thereby improving the noise reduction control effect and stability.
With reference to the first aspect, in a first implementation manner of the first aspect, the noise reduction distribution box further includes a power amplifier: the power amplifier is arranged on the distribution box body, one end of the power amplifier is in communication connection with the controller, and the other end of the power amplifier is in communication connection with the secondary loudspeaker.
With reference to the first aspect and the first embodiment of the first aspect, in a second embodiment of the first aspect, the reference microphone is connected to the first connection portion of the air inlet end through a flow-resistant secondary noise connection; or/and the error microphone is connected with the third connecting part of the air outlet end through a flow-resistant secondary noise connecting piece.
With reference to the second embodiment of the first aspect, in a third embodiment of the first aspect, the anti-streaming secondary noise connection comprises:
the sensing end face is provided with a fourth through hole;
the double-layer shell is arranged above the sensing end face;
a first sound absorbing material filled between the inner and outer shells of the double-sided case;
the reference microphone or/and the error microphone are embedded in the inner shell wall surface of the anti-flow secondary noise connecting piece, the vibrating diaphragm end of the reference microphone or/and the error microphone is close to the outer wall surface of the distribution box body, and the wiring end of the reference microphone or/and the error microphone is far away from the outer wall surface of the distribution box body.
With reference to the third embodiment of the first aspect, in the fourth embodiment of the first aspect, there is one first through hole on the first connection portion, and an area of the sensing end surface is the same as an area of the first through hole; and/or one third through hole is formed in the third connecting part, and the area of the sensing end face is the same as that of the third through hole.
With reference to the third embodiment of the first aspect, in the fifth embodiment of the first aspect, the anti-streaming secondary noise connector further includes a flange, and the flange is connected to the casing and used for fixing the anti-streaming secondary noise connector on the outer wall surface of the distribution box body.
With reference to the third implementation manner of the first aspect, in a sixth implementation manner of the first aspect, a portion, close to the sensing end face, of the inner shell is provided with a fifth through hole.
With reference to the sixth embodiment of the first aspect, in the seventh embodiment of the first aspect, the diameter of the second through hole is not greater than 2mm, and the ratio of the area of the second through holes to the area of the second connecting portion is not less than 25%; or/and the diameter of the fourth through hole is not more than 2mm, and the ratio of the sum of the areas of the plurality of fourth through holes to the area of the sensing end surface is not less than 25%; and/or the diameter of the fifth through hole is not more than 2mm, and the ratio of the area of the fifth through holes to the area of the part, close to the sensing end face, of the inner shell is not less than 25%.
With reference to the third embodiment of the first aspect, in the eighth embodiment of the first aspect, the second sealing member is disposed between the reference microphone and the error microphone and the inner casing wall surface of the anti-secondary-streaming noise structure.
With reference to the fifth embodiment of the first aspect, in the ninth embodiment of the first aspect, the sealing device further comprises a second sealing element or/and a third sealing element; the second sealing piece is arranged at the joint of the flange of the anti-flow-excitation secondary noise connecting piece and the outer wall surface of the distribution box body; the third seal is disposed at the junction of the secondary speaker and the outer wall surface of the cabinet body.
With reference to the first aspect and the first embodiment of the first aspect, in a tenth embodiment of the first aspect, the secondary speaker further includes a second sound-absorbing material, and the second sound-absorbing material is wrapped on the back side of the secondary speaker.
With reference to the first aspect and the first embodiment of the first aspect, in the eleventh embodiment of the first aspect, the one reference microphone is correspondingly connected to one of the air inlet ends; or/and the secondary loudspeaker is correspondingly arranged on one air outlet end; or/and the error microphone is correspondingly connected to the air outlet end.
With reference to the first aspect and the first embodiment of the first aspect, in a twelfth embodiment of the first aspect, the noise reduction distribution box includes at least two air outlet ends.
With reference to the third embodiment of the first aspect, in the thirteenth embodiment of the first aspect, the double-layered casing is cylindrical.
With reference to the thirteenth embodiment of the first aspect, in the fourteenth embodiment of the first aspect, the axis of the anti-tussive secondary noise connection is perpendicular to the distributor box body outer wall surface.
With reference to the first aspect and the first implementation manner of the first aspect, in a fifteenth implementation manner of the first aspect, the controller adopts a hardware architecture with a DSP + FPGA as a core.
According to a second aspect, an embodiment of the present invention further provides an air conditioning pipeline system, which includes a main air conditioning unit, an air distribution pipeline, and a noise reduction distribution box according to the first aspect of the present invention or any implementation manner of the first aspect of the present invention, disposed between the main air conditioning unit and the air distribution pipeline.
According to a third aspect, an embodiment of the present invention further provides an air conditioner, including a main air conditioner, an air distribution duct, and a noise reduction distribution box according to the first aspect of the present invention or any embodiment of the first aspect of the present invention, disposed between the main air conditioner and the air distribution duct.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case. In the drawings:
FIG. 1 is a schematic structural diagram of an active noise reduction distribution box of a train air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a structure of anti-streaming secondary noise according to an embodiment of the present invention.
Shown in the figure: 1-distribution box body, 11-air inlet end, 12-air outlet end, 13-distribution box body outer wall surface, 2-reference microphone, 21-reference microphone diaphragm end, 22-reference microphone terminal, 3-secondary loudspeaker, 4-error microphone, 41-error microphone diaphragm end, 42-error microphone terminal, 5-controller, 6-power amplifier, 7-signal line, 8-anti-flow excitation secondary noise connecting piece, 81-first sound absorption material, 82-first sealing piece, 83-inner shell wall surface, 84-flange, 85-second sealing piece and 86-sensing end surface.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The control effect and stability of the product are found to be poor in the process of applying the train air conditioner active noise reduction distribution box disclosed in the patent application with the application number of 201821773881.0. The analysis shows that the reasons for poor control effect and stability include: set up secondary sound source (speaker) at above-mentioned distributor box upstream entrance, control the noise of two exits of low reaches simultaneously, there is the problem of two exit control effect crosstalk, and secondary sound source is far away to low reaches exit distance, noise transmission path is more complicated, and its stability is not good enough.
Example 1
With reference to fig. 1, embodiment 1 of the present invention provides a noise reduction distribution box, which is applied to a train air conditioner. This distributor box includes: the distribution box comprises a distribution box body 1, wherein the distribution box body 1 is provided with an air inlet end 11 and an air outlet end 12; the reference microphone 2 is connected with the air inlet end 11 through a first connecting part, and a first through hole is formed in the first connecting part; the secondary loudspeaker 3 is connected with the air outlet end 12 through a second connecting part, and a second through hole is formed in the second connecting part; the error microphone 4 is connected with the air outlet end 12 through a third connecting part, and a third through hole is formed in the third connecting part; a controller 5 is communicatively connected to the reference microphone 2, the secondary speaker 3 and the error microphone 4.
As a specific embodiment, the controller 5 may be provided on the distributor box body.
In embodiment 1 of the present invention, the reference microphone 2 at the air inlet end 11 of the distribution box monitors the noise signal in real time through the first through hole and transmits the noise signal to the controller 5, the controller 5 calculates the parameters according to the secondary channel (the secondary channel is proper noun and refers to the whole transmission channel from the electric signal to the sound signal of the final control target position, including the pipeline characteristics, but also including the circuit characteristics, the electroacoustic transducer structure characteristics, etc.) and the primary noise (the primary noise to be controlled refers to the noise coming from the air inlet end and needs the initial noise) through the built-in active control algorithm to form the control signal to push the secondary speaker 3 to emit the inverse sound wave and transmit the inverse sound wave to the distribution box through the second through hole so as to cancel the noise coming from the air inlet end 11, the error microphone 4 at the air outlet end 12 monitors the noise cancellation effect in real time through the third through hole and transmits back to the controller 5, the controller 5 iteratively adjusts the output control signal according to the control result, so that the noise at the position of the air outlet end 12 is suppressed, and the control effect and the stability of noise reduction can be improved.
According to the principle of sound wave guide transmission, the noise at the position of the air outlet end 12 cannot be transmitted to the downstream air distribution pipeline after being controlled, so that the noise level of the whole carriage is reduced, and the active noise control of the train air conditioner host is realized.
In a specific embodiment, the diameter of the second through hole is not greater than 2mm, and the ratio of the area of the plurality of second through holes to the area of the second connecting portion is not less than 25%. In order to inhibit the problem of secondary noise at high flow speed, the embodiment of the invention perforates the pipe wall at the interface of the bypass pipe and the pipeline with high density and small aperture, thereby ensuring sound transmission and effectively guiding airflow in the pipe. The smaller the perforation diameter is, the lower the secondary noise generated at a certain flow rate is, and researches show that the perforation diameter of not more than 2mm can meet the project requirements. However, the perforation density should be increased while the perforation diameter is reduced, so that the overall perforation rate is ensured to be not lower than 25%, and the perforated plate is prevented from forming obvious low-frequency acoustic impedance to further influence the performances of the loudspeaker unit and the error microphone.
Further, as shown in fig. 1, the noise reduction distribution box shown in fig. 1 further includes a power amplifier 6, where the power amplifier 6 is disposed on the distribution box body 1, and one end of the power amplifier is in communication connection with the controller 5, and the other end of the power amplifier is in communication connection with the secondary speaker 3. In embodiment 1 of the present invention, the power amplifier 6 is configured to amplify the control signal output from the controller 5 and input the amplified control signal to the secondary speaker 3, whereby the accuracy of control can be improved.
Further, in the embodiment 1 of the present invention, the one reference microphone 2 is correspondingly connected to the one air inlet end 11; or/and one secondary loudspeaker 3 is correspondingly arranged on one air outlet end 12; or/and the error microphone 4 is correspondingly connected to the air outlet end 12. The number of the air outlet ends 12 is at least two. Specifically, in fig. 1, the distribution box body 1 includes an air inlet end 11 and at least two air outlet ends 12, the air inlet end 11 is connected with an air conditioner host at the upper reaches of the train air conditioning system, each air outlet end 12 is connected with a downstream air distribution pipeline of a branch pipeline where the air conditioner host is located, and air flow generated by the air conditioner host enters the distribution box body 1 from the air inlet end 11 and flows to the downstream air distribution pipeline through each air outlet end 12 after being divided by the distribution box body. The reference microphone 2 is arranged at the air inlet end 11. The number of the air outlet ends 12 is set according to the actual situation of the train, in this embodiment, two air outlet ends 12 are provided, the number of the secondary speakers 33 and the error microphones 44 is the same as the number of the air outlet ends 1212, one secondary speaker 3 and one error microphone 4 are provided at one air outlet end 12 in a paired manner, the reference microphone 2 and the error microphone 4 are provided with a plurality of through holes (i.e. a first through hole and a third through hole) at the positions of the outer wall surface of the distribution box (i.e. a first connecting portion and a third connecting portion) where the distribution box body 1 is in contact with the reference microphone 2 and the error microphone 4, so that the sound pressure signals inside the distribution box can be collected through the through holes, the secondary speaker 3 is provided with a plurality of through holes (i.e. a third through hole) at the position of the outer wall surface of the distribution box (i.e. the third connecting portion), so that the inverted secondary sound waves emitted by the secondary loudspeaker 3 can propagate through the through-hole into the interior of the distribution box to cancel out the noise. The controller 5 is connected with the reference microphone 2 and the error microphone 4 through a signal line 7 to receive a reference signal and an error signal and generate a control signal, the controller 5 is connected with the power amplifier 6 through the signal line 7 and transmits the control signal to the power amplifier 6, the power amplifier 6 amplifies the received control signal, and the signal line 7 pushes the secondary loudspeaker 3 to emit an inverted secondary sound wave to perform active noise control.
Further, in the noise reduction distribution box of embodiment 1 of the present invention, the reference microphone 2 is connected to the first connection portion of the air intake end 11 through a flow-resistant secondary noise connection member 8; or/and the error microphone 4 is connected with the third connecting part of the air outlet end 12 through a connecting piece 8 for resisting the secondary noise of the flow.
Further, as shown in fig. 1, in the noise reduction distribution box shown in fig. 1, a second seal 85 or/and a third seal are further included; the second sealing element 85 is arranged at the joint of the anti-flow secondary noise connecting piece 8 and the outer wall surface 13 of the distribution box body 1; the third seal is provided at the junction of the secondary speaker 3 and the outer wall surface 13 of the cabinet body 1.
Further, as shown in fig. 1, in the noise reduction distribution box shown in fig. 1, a second sound absorbing material is further included, and the second sound absorbing material is wrapped on the back side of the secondary speaker 3. The second sound-absorbing material can absorb the rear cavity radiated sound of the secondary speaker 3, whereby the noise reduction effect can be further improved.
Further, in the noise reduction distribution box according to embodiment 1 of the present invention, the controller 5 adopts a hardware architecture with a DSP + FPGA as a core.
In embodiment 1 of the present invention, a train air-conditioning pipeline system is provided with a distribution box for distributing air-conditioning airflow to each air distribution pipeline between an air-conditioning main unit and the air distribution pipeline, and the distribution box is located at an upstream inlet of the air distribution pipeline and an outlet of the air-conditioning main unit. On the train, adopt the distribution box of making an uproar falls in train air conditioner initiative accomplishes the initiative and falls the noise between the export of air conditioner host computer and the entry of cloth tuber pipe way, has completely isolated the dispersed way of air conditioner host computer noise along cloth tuber pipe way, does not influence the effect of even cloth wind simultaneously again, realizes low frequency noise control. The train air conditioner active noise reduction distribution box is compact in structure, can be directly installed in the existing train structure, solves the problem that the existing active control technology conflicts with a train body structure and air distribution uniformity when applied to a train air conditioner pipeline system, and improves the riding comfort of passengers.
Example 2
In a specific implementation mode, the diameter of the fourth through hole is not more than 2mm, and the area sum of the plurality of fourth through holes and the area ratio of the sensing end face 86 is not less than 25%. In order to inhibit the problem of secondary noise at high flow speed, the embodiment of the invention perforates the pipe wall at the interface of the bypass pipe and the pipeline with high density and small aperture, thereby ensuring sound transmission and effectively guiding airflow in the pipe. The smaller the perforation diameter is, the lower the secondary noise generated at a certain flow rate is, and researches show that the perforation diameter of not more than 2mm can meet the project requirements. However, the perforation density should be increased while the perforation diameter is reduced, so that the overall perforation rate is ensured to be not lower than 25%, and the perforated plate is prevented from forming obvious low-frequency acoustic impedance to further influence the performances of the loudspeaker unit and the error microphone.
Further, the anti-streaming secondary noise connecting piece 8 further comprises a flange 84, and the flange 84 is connected with the shell and used for fixing the anti-streaming secondary noise connecting piece 8 on the surface of the distribution box body 1.
Further, a fifth through hole is formed in a portion of the inner housing near the sensing end surface 86.
In a specific embodiment, the diameter of the fifth through hole is not greater than 2mm, and a ratio of an area of the fifth through holes to an area of a portion of the inner housing near the sensing end surface 86 is not less than 25%. In order to inhibit the problem of secondary noise at high flow speed, the embodiment of the invention perforates the pipe wall at the interface of the bypass pipe and the pipeline with high density and small aperture, thereby ensuring sound transmission and effectively guiding airflow in the pipe. The smaller the perforation diameter is, the lower the secondary noise generated at a certain flow rate is, and researches show that the perforation diameter of not more than 2mm can meet the project requirements. However, the perforation density should be increased while the perforation diameter is reduced, so that the overall perforation rate is ensured to be not lower than 25%, and the perforated plate is prevented from forming obvious low-frequency acoustic impedance to further influence the performances of the loudspeaker unit and the error microphone.
Further, a first sealing member 82 is further included, and the first sealing member 82 is disposed between the reference microphone 2 or/and the error microphone 4 and the inner casing wall 83 of the anti-streaming secondary noise structure.
Further, the double-layer shell is cylindrical.
That is, in fig. 2, the structure of resisting secondary flow noise is a cylindrical double-layer shell, the axis of the structure of resisting secondary flow noise is perpendicular to the outer wall surface 13 of the distribution box, the interior of the double-side shell is filled with a first sound absorbing material 81, the reference sound transmission and error microphone 4 is wrapped by a first sealing member 82 and then is tightly embedded in the cylindrical inner shell wall surface 83 of the structure of resisting secondary flow noise, the diaphragm ends 21 and 41 of the reference microphone 2 and error microphone 4 and the end close to the outer wall surface 13 of the distribution box, the terminals 22 and 42 of the reference microphone 2 and error microphone 4 and the end far from the outer wall surface 13 of the distribution box are exposed to the outer shell for connecting the signal line 7, the structure of resisting secondary flow noise is connected with the outer wall surface 13 of the distribution box through a ring-shaped flange 84 thereof, and a second sealing member 85 is used for sealing between the ring-shaped flange 84 and the outer wall surface, the sensing end face 86 is a through hole plate parallel to the outer wall face 13 of the distribution box, the part of the inner shell wall face 83 close to the sensing end face 86 is also of a through hole structure, the diameter of the through holes of the sensing end face 86 and the inner shell wall face 83 is not more than 2mm, and the density of the through holes is not less than 25%.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided would be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego such subject matter, nor should the applicant consider that such subject matter is not considered part of the disclosed subject matter.
Claims (10)
1. A noise reducing distribution box, comprising:
the distribution box comprises a distribution box body (1), wherein the distribution box body (1) is provided with an air inlet end (11) and an air outlet end (12);
the reference microphone (2), the reference microphone (2) is connected with the air inlet end (11) through a first connecting part, and the first connecting part is provided with a first through hole;
the secondary loudspeaker (3) is connected with the air outlet end (12) through a second connecting part, and a second through hole is formed in the second connecting part;
the error microphone (4) is connected with the air outlet end (12) through a third connecting part, and a third through hole is formed in the third connecting part;
a controller (5) communicatively coupled to the reference microphone (2), the secondary speaker (3), and the error microphone (4).
2. The noise reduction distribution box according to claim 1, further comprising a power amplifier (6), wherein the power amplifier (6) is arranged on the distribution box body (1), one end of the power amplifier is connected with the controller (5) in a communication mode, and the other end of the power amplifier is connected with the secondary loudspeaker (3) in a communication mode.
3. The noise reducing distribution box of claim 1 or 2, wherein:
the reference microphone (2) is connected with the first connecting part of the air inlet end (11) through a secondary noise connecting piece (8) for resisting flow and shock;
or/and the error microphone (4) is connected with the third connecting part of the air outlet end (12) through a flow-resistant secondary noise connecting piece (8).
4. A noise reducing distribution box according to claim 3, characterized in that said anti-flow induced secondary noise connection (8) comprises:
the sensing end face (86), and a fourth through hole is formed in the sensing end face (86);
a double-layer housing disposed above the sensing end face (86);
a first sound absorbing material (81) filled between the inner and outer shells of the double-layered shell;
the reference microphone (2) or/and the error microphone (4) are embedded into an inner shell wall surface (83) of the anti-flow excitation secondary noise connecting piece (8), a vibrating diaphragm end of the reference microphone (2) or/and the error microphone (4) is close to the outer wall surface (13) of the distribution box body, and a wiring end of the reference microphone (2) or/and the error microphone (4) is far away from the outer wall surface (13) of the distribution box body.
5. The noise reducing distribution box of claim 4, wherein:
the number of the first through holes on the first connecting part is one, and the area of the sensing end face (86) is the same as that of the first through holes;
and/or one third through hole is arranged on the third connecting part, and the area of the sensing end face (86) is the same as that of the third through hole.
6. A noise reducing distribution box according to claim 4, wherein the anti-streaming secondary noise connector (8) further comprises a flange (84), the flange (84) being connected to the housing for securing the anti-streaming secondary noise connector (8) to the distribution box body outer wall surface (13).
7. The noise reducing distribution box of claim 4, wherein a portion of the inner shell adjacent to the sensing end face (86) is provided with a fifth through hole.
8. The noise reducing distribution box of claim 7,
the diameter of the second through holes is not more than 2mm, and the ratio of the area of the second through holes to the area of the second connecting part is not less than 25%;
or/and the diameter of the fourth through hole is not more than 2mm, and the ratio of the area sum of the plurality of fourth through holes to the area of the sensing end face (86) is not less than 25%;
or/and the diameter of the fifth through hole is not more than 2mm, and the ratio of the area of the fifth through holes to the area of the part, close to the sensing end face (86), of the inner shell is not less than 25%.
9. An air-conditioning pipeline system, which comprises an air-conditioning main machine, an air distribution pipeline and the noise-reduction distribution box as claimed in any one of claims 1 to 8, wherein the noise-reduction distribution box is arranged between the air-conditioning main machine and the air distribution pipeline.
10. An air conditioner, comprising an air conditioner main machine, an air distribution pipeline and the noise reduction distribution box as claimed in any one of claims 1 to 8, wherein the noise reduction distribution box is arranged between the air conditioner main machine and the air distribution pipeline.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911127605.6A CN110843831A (en) | 2019-11-18 | 2019-11-18 | Distribution box, air conditioner pipe system and air conditioner of making an uproar fall |
| PCT/CN2020/112176 WO2021098331A1 (en) | 2019-11-18 | 2020-08-28 | Noise reduction distribution box, air conditioner pipeline system and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911127605.6A CN110843831A (en) | 2019-11-18 | 2019-11-18 | Distribution box, air conditioner pipe system and air conditioner of making an uproar fall |
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| Publication Number | Publication Date |
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| CN110843831A true CN110843831A (en) | 2020-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911127605.6A Pending CN110843831A (en) | 2019-11-18 | 2019-11-18 | Distribution box, air conditioner pipe system and air conditioner of making an uproar fall |
Country Status (2)
| Country | Link |
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| CN (1) | CN110843831A (en) |
| WO (1) | WO2021098331A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021098331A1 (en) * | 2019-11-18 | 2021-05-27 | 中科振声（苏州）电子科技有限公司 | Noise reduction distribution box, air conditioner pipeline system and air conditioner |
| CN115512677A (en) * | 2022-08-16 | 2022-12-23 | 广州精益运输制冷设备有限公司 | Noise-reduction air distribution device for rail train air conditioner |
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| Publication number | Publication date |
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| WO2021098331A1 (en) | 2021-05-27 |
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