CN114848990A - Breathing machine with active noise reduction function - Google Patents
Breathing machine with active noise reduction function Download PDFInfo
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- CN114848990A CN114848990A CN202210492837.7A CN202210492837A CN114848990A CN 114848990 A CN114848990 A CN 114848990A CN 202210492837 A CN202210492837 A CN 202210492837A CN 114848990 A CN114848990 A CN 114848990A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/0057—Pumps therefor
- A61M16/0066—Blowers or centrifugal pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
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Abstract
The application provides a breathing machine with an active noise reduction function, which comprises a fan, an air inlet channel and an active noise reduction assembly, wherein the fan is used for generating airflow for a user to breathe; the air inlet channel is communicated with an air inlet of the fan. The active noise reduction assembly is arranged on the air inlet channel and used for emitting noise reduction sound waves towards the fan. In the breathing machine with the active noise reduction function of this application, the air inlet channel communicates with the air intake of fan, and then behind the air intake of the air admission fan in the air inlet channel, produce the air current that supplies the user to breathe by the fan. The active noise reduction assembly is arranged on the air inlet channel and used for sending noise reduction sound waves towards the fan, the phase of the noise reduction sound waves is opposite to that of the fan noise, and the frequency and the amplitude of the noise reduction sound waves are the same; the active noise reduction assembly sends noise reduction sound waves to be offset with noise generated by the fan, so that the noise generated by the fan is reduced, and the influence of the noise generated by the fan on the sleep quality of a user is reduced.
Description
Technical Field
The application belongs to the technical field of breathing equipment, especially, relate to a breathing machine with function of making an uproar is fallen in initiative.
Background
The sleep respirator provides airflow for a patient through a given pressure or minute ventilation, so as to improve the oxygen deficiency problem of the patient during sleep. The sleep breathing machine is mainly used for treating sleep apnea syndrome (airway collapse and central apnea), and can also be used for treating complications of the sleep apnea syndrome, improving the blood oxygen concentration of a user in sleep at night, treating hypoxemia and the like.
The sleep respirator is used for generating airflow with preset pressure or ventilation volume by a fan and conveying the airflow to a patient through a humidifier, a breathing pipeline and a nose mask. The motor in the fan drives the fan blade, and the high-speed rotation of fan blade can produce vibrations noise and aerodynamic noise, and these noises outwards propagate through the fan and can seriously influence user's sleep quality.
Disclosure of Invention
The embodiment of the application provides a breathing machine with an active noise reduction function, and aims to solve the problem that the sleep quality of a user is affected by noise emitted by a fan in the existing breathing machine.
The embodiment of the application provides a breathing machine with actively falling the function of making an uproar, breathing machine with actively falling the function of making an uproar includes:
a fan for generating an airflow for a user to breathe;
the air inlet channel is communicated with an air inlet of the fan;
the active noise reduction assembly is arranged on the air inlet channel and used for facing the fan to emit noise reduction sound waves.
Optionally, the active noise reduction assembly includes a first microphone, a controller and a noise reduction horn, and the first microphone and the noise reduction horn are both disposed on the air inlet channel;
the controller is respectively connected with the first microphone and the noise reduction loudspeaker, and the first microphone is used for acquiring a first noise signal of the fan; the controller is used for receiving the first noise signal and controlling the noise reduction loudspeaker to send noise reduction sound waves matched with the first noise signal according to the first noise signal.
Optionally, the active noise reduction assembly further includes:
the second microphone is arranged on one side, away from the fan, of the noise reduction loudspeaker and used for collecting a second noise signal after noise reduction;
the controller is connected with the second microphone and used for receiving the second noise signal and correcting the noise reduction sound wave emitted by the noise loudspeaker according to the second noise signal.
Optionally, the ventilator with the active noise reduction function further includes a first cavity, and the first cavity surrounds the fan.
Optionally, a support member is arranged in the first cavity, and the support member supports the fan.
Optionally, a buffer is further disposed between the supporting member and the fan.
Optionally, the air inlet channel includes a second cavity, a third cavity and a first noise reduction pipe, and the second cavity, the first noise reduction pipe, the third cavity and the air inlet of the fan are sequentially communicated;
the fan is arranged below the first noise reduction pipe, and the active noise reduction assembly is arranged on the first noise reduction pipe.
Optionally, the airflow direction of the second cavity and the airflow direction of the first noise reduction tube are inclined to each other, and the airflow direction of the first noise reduction tube and the airflow direction of the third cavity are inclined to each other.
Optionally, one end of the first noise reduction pipe protrudes into the second cavity, and the other end of the first noise reduction pipe protrudes into the third cavity.
Optionally, the air inlet channel includes a second noise reduction pipe, the second noise reduction pipe is communicated with the air inlet of the fan, and the active noise reduction assembly is arranged on the second noise reduction pipe.
In the breathing machine with the active noise reduction function provided by the embodiment of the application, the air inlet channel is communicated with the air inlet of the fan, and then air in the air inlet channel enters the air inlet of the fan and then is generated by the fan to supply air flow for a user to breathe. And the active noise reduction assembly is arranged on the air inlet channel and is used for sending noise reduction waves towards the fan, and the active noise reduction assembly sends noise reduction waves to be offset with noise generated by the fan, so that the noise generated by the fan is reduced, and the influence of the noise generated by the fan on the sleeping quality of a user is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
For a more complete understanding of the present application and its advantages, reference is now made to the following descriptions taken in conjunction with the accompanying drawings. Wherein like reference numerals refer to like parts in the following description.
Fig. 1 is a schematic structural diagram of a ventilator with an active noise reduction function according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural diagram of another ventilator with an active noise reduction function according to an embodiment of the present disclosure.
Fig. 3 is a schematic structural diagram of an active noise reduction assembly according to an embodiment of the present disclosure.
Fig. 4 is a schematic structural diagram of another ventilator with an active noise reduction function according to an embodiment of the present disclosure.
Fig. 5 is a schematic structural diagram of another ventilator with an active noise reduction function according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be described below clearly and completely with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any inventive work, are within the scope of protection of the present application.
The sleep respirator provides airflow for a patient through a given pressure or minute ventilation, so as to improve the oxygen deficiency problem of the patient during sleep. The sleep breathing machine is mainly used for treating sleep apnea syndrome (airway collapse and central apnea), and can also be used for treating complications of the sleep apnea syndrome, improving the blood oxygen concentration of a user in sleep at night, treating hypoxemia and the like.
The sleep respirator is used for generating airflow with preset pressure or ventilation volume by a fan and conveying the airflow to a patient through a humidifier, a breathing pipeline and a nose mask. The motor in the fan drives the fan blade, and the high-speed rotation of fan blade can produce vibrations noise and aerodynamic noise, and these noises outwards propagate through the fan and can seriously influence user's sleep quality.
The types of noise generated by the fan are mainly as follows:
1. rotational noise is noise generated due to interaction of the asymmetric structure around the blades and the circumferentially non-uniform flow field formed by the rotation of the blades. The noise is related to the rotating speed of the impeller, and particularly under the conditions of high speed and low load, the noise is particularly prominent;
2. the vortex noise is mainly vortex noise caused by pressure pulsation on the blade due to a turbulent boundary layer and vortex separation bodies generated when airflow flows through the blade, and the vortex has a wide frequency range and is generally called as broadband noise;
3. motor noise mainly includes: rotational noise due to poor rotor dynamic balance, electromagnetic noise due to rotor cutting magnetic field, aerodynamic noise of cooling fan, mechanical noise due to bearing friction, and the like.
For the noise of fan in the reduction breathing machine, generally be provided with the amortization cotton that porous sound absorbing material supported in the current breathing machine, nevertheless set up the amortization cotton and can produce as follows again:
1. the noise reduction cotton is a porous sound absorption material, most of the sound absorption cotton is foamed and molded by polyurethane and other plastics, and the porous sound absorption material can age after long-time use to generate a plurality of fine particles which are brought into the lung of a patient by airflow and deposited in the lung of the patient, so that the health of the patient is seriously harmed;
2. the porous sound absorption material is arranged in the gas path, dust is collected and bacteria and viruses are bred, and the internal gas path cannot be cleaned and disinfected by a patient himself, so that the health of the patient is seriously harmed;
3. because the porous sound-absorbing material must reach certain thickness, just has noise cancelling effect, and the gas circuit needs very big volume just can reach noise cancelling effect. Therefore, the whole machine is very large;
4. the porous sound absorption material has good sound absorption effect on middle and high frequency noise, and is not ideal for the sound absorption effect of low frequency noise.
In order to solve the problem that the sleep quality of a user is affected by noise emitted by a fan in an existing ventilator, an embodiment of the present application provides a ventilator with an active noise reduction function, as shown in fig. 1, and fig. 1 is a schematic structural diagram of the ventilator with the active noise reduction function provided in the embodiment of the present application. The ventilator with the active noise reduction function comprises a fan 4, an air inlet channel and an active noise reduction component 6, wherein the fan 4 is used for generating airflow for a user to breathe; the air inlet channel is communicated with an air inlet 401 of the fan 4. The active noise reduction assembly 6 is arranged on the air inlet channel, and the active noise reduction assembly 6 is used for emitting noise reduction sound waves towards the fan 4.
In the breathing machine with the active noise reduction function provided by the embodiment of the application, the air inlet channel is communicated with the air inlet 401 of the fan 4, and then air in the air inlet channel enters the air inlet 401 of the fan 4 and then is generated by the fan 4 to supply air flow for a user to breathe. And the subassembly 6 of making an uproar falls in the initiative is located on inlet air channel, and the subassembly 6 of making an uproar falls in the initiative is used for sending towards fan 4 and falls the sound wave of making an uproar, and the subassembly 6 of making an uproar falls in the initiative and sends the sound wave of making an uproar and the noise that fan 4 produced and offset each other to reduce the noise that fan 4 produced, reduce the influence of the noise that fan 4 produced to user sleep quality.
As shown in fig. 2, the active noise reduction assembly 6 includes a first microphone 602, a controller 605, and a noise reduction horn 603, and the first microphone 602 and the noise reduction horn 603 are disposed on the air inlet channel. The controller 605 is connected to the first microphone 602 and the noise reduction speaker 603, respectively, and the first microphone 602 is configured to collect a first noise signal of the fan 4; the controller 605 is configured to receive the first noise signal, and control the noise reduction speaker 603 to emit a noise reduction sound wave matched with the first noise signal according to the first noise signal. Illustratively, the phase of the noise reduction sound wave is opposite to that of the noise generated by the fan 4, and the frequency and amplitude of the noise reduction wave are the same as those of the noise of the fan 4. The first microphone 602 collects a first noise signal of the fan 4, and transmits the first noise signal of the fan 4 to the controller 605; the controller 605 receives the first noise signal, the controller 605 outputs a control signal to the noise reduction horn 603 according to the first noise signal, so that the controller 605 controls the noise reduction horn 603 to send a noise reduction sound wave with the same amplitude as the first noise signal, and the noise wave signal and the noise generated by the fan 4 are mutually offset, so that the noise generated by the fan 4 is reduced, and the influence of the noise generated by the fan 4 on the sleep quality of a user is reduced. The noise reduction sound wave emitted by the noise reduction horn 603 matches the first noise signal, i.e. the noise reduction sound wave has the same amplitude as the first noise signal. For example, the controller 605 may be a control board, such as a DSP control board.
Because the noise generated by the fan 4 is changed at any time when being transmitted to the first microphone 602 due to the influence of the working power of the breathing machine, etc., the first microphone 602 can collect the first noise signal of the fan 4 in real time and transmit the first noise signal to the controller 605; the controller 605 receives the first noise signal, and the controller 605 outputs a control signal to the noise reduction horn 603 according to the first noise signal, so that the controller 605 controls the noise reduction horn 603 to emit a noise reduction sound wave with the same amplitude as the first noise signal which changes in real time.
As shown in fig. 2 and fig. 3, the active noise reduction assembly 6 further includes a second microphone 604, the second microphone 604 is disposed on a side of the noise reduction horn 603 facing away from the fan 4, and the second microphone 604 is configured to collect a second noise signal after noise reduction. The controller 605 is further connected to the second microphone 604, and the controller 605 is configured to receive the second noise signal and correct the noise reduction wave emitted by the noise horn according to the second noise signal.
Due to the influence of the structure of the breathing machine and the like, the first noise signal cannot be completely limited within the set range after the noise reduction sound wave emitted by the noise reduction horn 603 and the first noise signal are mutually offset. The second microphone 604 is configured to collect a second noise signal after noise reduction, where the second noise signal is a residual noise signal after the noise reduction sound wave and the first noise signal are cancelled out, and the effect that the second noise signal cancels the first noise signal for the noise reduction sound wave can be obtained through the second noise signal, and if the residual noise signal still exceeds a set range, the noise reduction sound wave needs to be corrected (the set range is a noise magnitude set manually, for example, 40 db). Therefore, after receiving the second noise signal, the controller 605 can correct the noise reduction sound wave emitted by the noise horn according to the second noise signal, for example, when the second noise signal exceeds the set range, the noise reduction sound wave emitted by the noise horn is increased to better cancel the first noise signal, so as to reduce the second noise signal. Wherein the modified noise reducing sound wave may be a frequency, phase or amplitude of the modified noise reducing wave.
As shown in fig. 3, the ventilator with active noise reduction function further includes a first cavity 701, and the first cavity 701 surrounds the blower 4. The first cavity 701 surrounds the fan 4 and isolates the fan 4 from the air outside the first cavity 701, so that the volume of noise generated by the fan 4 conducted to the environment outside the first cavity 701 is reduced.
As shown in fig. 3, a support member 5 is disposed in the first cavity 701, and the support member 5 supports the fan 4. This support piece 5 supports fan 4 on the one hand, and on the other hand can reduce fan 4 self vibrations to reduce the noise that fan 4 vibrations arouse.
As shown in fig. 3, a buffer 3 is disposed between the supporting member 5 and the fan 4. This buffer 3 sets up between support piece 5 and fan 4, can provide the buffering for support piece 5 and fan 4, further reduces fan 4 self vibrations to further reduce the noise that fan 4 vibrations arouse. The buffer 3 may be a silicone cushion, for example.
As shown in fig. 3, the air intake channel includes a second cavity 702, a third cavity 703 and a first noise reduction pipe 601, and the second cavity 702, the first noise reduction pipe 601, the third cavity 703 and the air intake 401 of the fan 4 are sequentially communicated; the fan 4 is arranged below the first noise reduction pipe 601, and the active noise reduction assembly 6 is arranged on the first noise reduction pipe 601.
The second cavity 702, the first noise reduction pipe 601, the third cavity 703 and the air inlet 401 of the fan 4 are sequentially communicated, so that air flows for a user to breathe through the fan 4 after entering the air inlet 401 of the fan 4 through the second cavity 702, the first noise reduction pipe 601 and the third cavity 703 in sequence. Because the fan 4 is arranged below the first noise reduction pipe 601, and the active noise reduction assembly 6 is arranged on the first noise reduction pipe 601, the active noise reduction assembly 6 sends out noise reduction waves downwards to be offset with noise generated by the fan 4, so that the noise generated by the fan 4 is reduced, and the influence of the noise generated by the fan 4 on the sleep quality of a user is reduced.
Illustratively, the airflow direction of the second cavity 702 and the airflow direction of the first noise reduction pipe 601 are inclined to each other, and the airflow direction of the first noise reduction pipe 601 and the airflow direction of the third cavity 703 are inclined to each other. The noise generated by the fan 4 is most easily propagated through the air, namely, the noise passes through the third cavity 703, the first noise reduction pipe 601 and the second cavity 702 in sequence and is propagated outwards; and the air flow direction that sets up second cavity 702 and the air flow direction of first noise reduction pipe 601 slope each other, after the air flow direction of first noise reduction pipe 601 and the air flow direction of third cavity 703 slope each other, can make the better tortuous of inlet air channel's cross-section, when the noise that fan 4 produced was propagated along the inlet air channel, the noise was easily in the internal reflection of inlet air channel, and a plurality of noise sound waves that are reflected offset each other to reduce the noise volume.
As shown in fig. 3, the airflow direction of the second cavity 702 is perpendicular to the airflow direction of the first noise reduction tube 601, and the airflow direction of the first noise reduction tube 601 is perpendicular to the airflow direction of the third cavity 703. So set up after can make air intake duct's better tortuous of cross-section, then when the noise that fan 4 produced was propagated along air intake duct, the noise was more easily at air intake duct internal reflection, and a plurality of noise sound waves by the reflection offset each other to further noise reduction volume.
As shown in fig. 3, one end of the first noise reduction pipe 601 protrudes into the second cavity 702, and the other end of the first noise reduction pipe 601 protrudes into the third cavity 703. After so setting up, the first pipe 601 that falls makes an uproar is outstanding to the tip of second cavity 702, third cavity 703 can make air intake channel's cross-section better tortuous, and then when the noise that fan 4 produced was propagated along air intake channel, the noise was more easily reflected in air intake channel, and a plurality of noise sound waves that are reflected offset each other to further reduce the noise volume.
As shown in fig. 3, the above-mentioned breathing apparatus with active noise reduction function further includes a filter element assembly 1 and a housing assembly 2, where the filter element assembly 1, the second cavity 702, the first noise reduction tube 601, the third cavity 703 and the air inlet 401 of the fan 4 are sequentially communicated, so that the filter element assembly 1 can filter air. The filter element assembly 1 comprises a filter element upper cover 101, a filter element 102, a filter element sealing ring 103 and a filter element lower cover 104, wherein the filter element 102 is clamped by the filter element upper cover 101 and the filter element lower cover 104, and the filter element 102 is sealed by the filter element sealing ring 103.
The housing assembly 2 comprises a filter element mounting seat 201, a housing upper cover 202 and a housing middle cover 203, a housing lower cover 204, wherein the filter element mounting seat 201, the housing upper cover 202 and the housing middle cover 203 are sequentially connected with the housing lower cover 204 to form the housing assembly 2, and the filter element assembly 1 is mounted on the filter element mounting seat 201.
As shown in fig. 4, the air inlet channel includes a second noise reduction pipe 606, the second noise reduction pipe 606 is communicated with the air inlet 401 of the fan 4, and the active noise reduction assembly 6 is disposed on the second noise reduction pipe 606. The active noise reduction assembly 6 includes a first microphone 602, a controller 605 and a noise reduction speaker 603, and the first microphone 602 and the noise reduction speaker 603 are disposed on the air inlet channel. The controller 605 is connected to the first microphone 602 and the noise reduction speaker 603, respectively, and the first microphone 602 is configured to collect a first noise signal of the fan 4; the controller 605 is configured to receive the first noise signal, and control the noise reduction speaker 603 to emit a noise reduction sound wave matched with the first noise signal according to the first noise signal.
The first microphone 602 collects a first noise signal of the fan 4, and transmits the first noise signal of the fan 4 to the controller 605; the controller 605 receives the first noise signal, and the controller 605 outputs a control signal to the noise reduction loudspeaker 603 according to the first noise signal, so that the controller 605 controls the noise reduction loudspeaker 603 to send a noise reduction sound wave with the same amplitude as the first noise signal, and the noise wave signal and the noise generated by the fan 4 are mutually offset, so that the noise generated by the fan 4 is reduced, and the influence of the noise generated by the fan 4 on the sleep quality of a user is reduced. The noise reduction sound wave emitted by the noise reduction horn 603 matches the first noise signal, i.e. the noise reduction sound wave has the same amplitude as the first noise signal. Illustratively, the controller 605 may be a control board, such as a DSP control board.
Due to the influence of the work power of the ventilator, the noise generated by the fan 4 changes at any time when being transmitted to the first microphone 602, so that the first microphone 602 can collect the first noise signal of the fan 4 in real time and transmit the first noise signal to the controller 605; the controller 605 receives the first noise signal, and the controller 605 outputs a control signal to the noise reduction horn 603 according to the first noise signal, so that the controller 605 controls the noise reduction horn 603 to emit a noise reduction sound wave with the same amplitude as the first noise signal which changes in real time.
As shown in fig. 5, the active noise reduction assembly 6 further includes a second microphone 604, the second microphone 604 is disposed on a side of the noise reduction horn 603 facing away from the fan 4, and the second microphone 604 is configured to collect a second noise signal after noise reduction. The controller 605 is further connected to the second microphone 604, and the controller 605 is configured to receive the second noise signal and modify the noise reduction sound wave emitted by the noise horn according to the second noise signal.
Due to the influence of the structure of the breathing machine and the like, the first noise signal cannot be completely limited within the set range after the noise reduction sound wave emitted by the noise reduction horn 603 and the first noise signal are mutually offset. The second microphone 604 is configured to collect a second noise signal after noise reduction, where the second noise signal is a residual noise signal after the noise reduction sound wave and the first noise signal are cancelled out, and the effect that the second noise signal cancels the first noise signal for the noise reduction sound wave can be obtained through the second noise signal, and if the residual noise signal still exceeds a set range, the noise reduction sound wave needs to be corrected (the set range is a noise magnitude set manually, for example, 40 db). Therefore, after receiving the second noise signal, the controller 605 can correct the noise reduction sound wave emitted by the noise horn according to the second noise signal, for example, when the second noise signal exceeds the set range, the noise reduction sound wave emitted by the noise horn is increased to better cancel the first noise signal, so as to reduce the second noise signal. Wherein the modified noise reducing sound wave may be a frequency, a phase or an amplitude of the modified noise reducing sound wave.
In summary, the present application provides a ventilator with active noise reduction function, the air inlet channel is communicated with the air inlet 401 of the fan 4, and then the air in the air inlet channel enters the air inlet 401 of the fan 4, and then the fan 4 generates the air flow for the user to breathe. And active noise reduction assembly 6 locates on inlet air channel, and active noise reduction assembly 6 is used for sending towards fan 4 and falls the sound wave of making an uproar, and active noise reduction assembly 6 sends and falls the sound wave of making an uproar and the noise that fan 4 produced and offset each other to reduce the noise that fan 4 produced, reduce the influence of the noise that fan 4 produced to user's quality of sleeping.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. The above detailed description is provided for a ventilator with active noise reduction function provided in the embodiments of the present application, and the principles and embodiments of the present application are described herein by applying specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A ventilator with an active noise reduction function, comprising:
a fan for generating an airflow for a user to breathe;
the air inlet channel is communicated with an air inlet of the fan;
the active noise reduction assembly is arranged on the air inlet channel and used for facing the fan to emit noise reduction sound waves.
2. The respirator with the active noise reduction function according to claim 1, wherein the active noise reduction assembly comprises a first microphone, a controller and a noise reduction horn, and the first microphone and the noise reduction horn are both arranged on the air inlet channel;
the controller is respectively connected with the first microphone and the noise reduction loudspeaker, and the first microphone is used for acquiring a first noise signal of the fan; the controller is used for receiving the first noise signal and controlling the noise reduction loudspeaker to send noise reduction sound waves matched with the first noise signal according to the first noise signal.
3. The ventilator with active noise reduction function of claim 2 wherein said active noise reduction assembly further comprises:
the second microphone is arranged on one side, away from the fan, of the noise reduction loudspeaker and used for collecting a second noise signal after noise reduction;
the controller is connected with the second microphone and used for receiving the second noise signal and correcting the noise reduction sound wave emitted by the noise loudspeaker according to the second noise signal.
4. The ventilator of claim 3 further comprising a first cavity surrounding said blower.
5. The ventilator according to claim 4, wherein a support member is disposed in the first chamber, and the support member supports the blower.
6. The respirator with the active noise reduction function according to claim 5, wherein a buffer is further disposed between the support and the blower.
7. The respirator with the active noise reduction function according to any one of claims 1 to 6, wherein the air inlet channel comprises a second cavity, a third cavity and a first noise reduction pipe, and the second cavity, the first noise reduction pipe, the third cavity and the air inlet of the fan are sequentially communicated;
the fan is arranged below the first noise reduction pipe, and the active noise reduction assembly is arranged on the first noise reduction pipe.
8. The ventilator of claim 7, wherein the airflow direction of the second chamber and the airflow direction of the first noise reduction tube are mutually inclined, and the airflow direction of the first noise reduction tube and the airflow direction of the third chamber are mutually inclined.
9. The ventilator of claim 8 wherein one end of said first noise reduction tube protrudes into said second chamber and the other end of said first noise reduction tube protrudes into said third chamber.
10. The respirator with the active noise reduction function according to any one of claims 1 to 6, wherein the air inlet channel comprises a second noise reduction pipe, the second noise reduction pipe is communicated with an air inlet of the fan, and the active noise reduction assembly is arranged on the second noise reduction pipe.
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| CN202210492837.7A CN114848990A (en) | 2022-05-07 | 2022-05-07 | Breathing machine with active noise reduction function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115507065A (en) * | 2022-09-13 | 2022-12-23 | 杭州贝丰科技股份有限公司 | Low-noise breathing machine air source box |
| CN117350099A (en) * | 2023-09-11 | 2024-01-05 | 北京五瑞美阳医疗器械有限责任公司 | Finite element analysis-based respirator noise reduction structure optimization method |
-
2022
- 2022-05-07 CN CN202210492837.7A patent/CN114848990A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115507065A (en) * | 2022-09-13 | 2022-12-23 | 杭州贝丰科技股份有限公司 | Low-noise breathing machine air source box |
| CN117350099A (en) * | 2023-09-11 | 2024-01-05 | 北京五瑞美阳医疗器械有限责任公司 | Finite element analysis-based respirator noise reduction structure optimization method |
| CN117350099B (en) * | 2023-09-11 | 2024-04-16 | 北京五瑞美阳医疗器械有限责任公司 | Finite element analysis-based respirator noise reduction structure optimization method |
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