CN115507065A - Low-noise breathing machine air source box - Google Patents
Low-noise breathing machine air source box Download PDFInfo
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- CN115507065A CN115507065A CN202211111182.0A CN202211111182A CN115507065A CN 115507065 A CN115507065 A CN 115507065A CN 202211111182 A CN202211111182 A CN 202211111182A CN 115507065 A CN115507065 A CN 115507065A
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- 230000029058 respiratory gaseous exchange Effects 0.000 title claims abstract description 21
- 238000009434 installation Methods 0.000 claims abstract description 22
- 239000011148 porous material Substances 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 8
- 210000001503 joint Anatomy 0.000 claims description 7
- 210000005239 tubule Anatomy 0.000 claims description 7
- 241000446313 Lamella Species 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 230000006978 adaptation Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 description 13
- 230000000694 effects Effects 0.000 description 11
- 239000006260 foam Substances 0.000 description 7
- 230000008030 elimination Effects 0.000 description 6
- 238000003379 elimination reaction Methods 0.000 description 6
- 238000005192 partition Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 230000001154 acute effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000003584 silencer Effects 0.000 description 2
- 230000001743 silencing effect Effects 0.000 description 2
- 206010019233 Headaches Diseases 0.000 description 1
- 206010061218 Inflammation Diseases 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 208000030303 breathing problems Diseases 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
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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
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
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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
- A61M16/08—Bellows; Connecting tubes ; Water traps; Patient circuits
-
- 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
- A61M16/10—Preparation of respiratory gases or vapours
-
- 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
- A61M16/20—Valves specially adapted to medical respiratory devices
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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
- F04D29/08—Sealings
- F04D29/083—Sealings especially adapted for elastic fluid 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid 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
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
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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
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/626—Mounting or removal of fans
-
- 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
-
- 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
- F04D29/665—Sound attenuation by means of resonance chambers or interference
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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heart & Thoracic Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Emergency Medicine (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pulmonology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air-Flow Control Members (AREA)
Abstract
The invention discloses a low-noise breathing machine air source box which comprises an upper cover plate, a Tesla valve one-way airflow plate, a middle orifice plate and a lower cover plate which are assembled into a whole from top to bottom and are sequentially communicated, wherein an air outlet is formed in the lower cover plate, an installation groove is formed in the lower cover plate, the middle orifice plate is inserted into the installation groove and forms a lower cavity with the lower cover plate, an upper cavity is formed between the middle orifice plate and the Tesla valve one-way airflow plate, a fan is installed on the middle orifice plate, an inlet of the fan is positioned in the upper cavity and is communicated with the lower cavity through the middle orifice plate, and an outlet of the fan is communicated with the air outlet. According to the invention, the Tesla valve one-way airflow plate is arranged, when noise is reversely transmitted through the Tesla one-way airflow plate, the main flow noise transmission direction is opposite to the airflow speed direction, the noise intensity is obviously weakened, and the transmission direction of part of branch flow noise and the noise transmission direction in the main flow form an obtuse angle to generate interference cancellation and also weaken, so that the problem of high noise of a sponge-free air source box in the existing industry is solved.
Description
Technical Field
The invention relates to the technical field of breathing machines, in particular to a low-noise breathing machine air source box.
Background
The breathing machine is a medical device with artificial replacement of autonomous ventilation, and is widely applied to various respiratory support auxiliary systems. The high-speed rotating turbine fan in the respirator is a gas source for assisting respiration, the turbine fan can generate higher pneumatic noise in the operation process, and the noise directly influences the use experience of a patient through air flow conduction and acoustic radiation. In addition, noise generated by the operating ventilator can also be radiated to the surrounding space, certain noise interference can be caused to non-ventilator users in the space, and normal life is influenced. The requirements of the breathing machine, especially the household breathing machine on noise are particularly strict, most of the household breathing machines are used by patients during sleeping, so that a quiet sleeping environment needs to be ensured, and the excellent household breathing machine noise is less than 30 dB.
In order to achieve such quiet operation effect, a noise reduction method widely adopted at present is to add foam sponge in an air passage of an air source box for noise reduction. However, the method has the problems that the foam sponge is aged after being used for a long time to generate dust which is then sent into a human body by a breathing machine, and the degraded foam particles can cause headache, irritation, inflammation and breathing problems and have certain toxicity and carcinogenic risks. Therefore, the existing breathing machine with the noise reduction sponge needs to replace the sponge foam every time interval so as to avoid generating foam particles. This undoubtedly increases the cost of use for the patient and affects the experience of use. Therefore, the sponge-free foam breathing machine is a great trend of the development of the industry later, and a certain technical barrier exists when the noise of the sponge-free air source box in China is reduced to be below 30 dB.
Disclosure of Invention
The invention aims to provide a low-noise breathing machine air source box aiming at the defects in the prior art, and solves the problem that the existing industry has no sponge air source box and has high noise.
The technical scheme for realizing the aim of the invention is as follows:
the utility model provides a low noise breathing machine air supply box, includes upper cover plate, tesla valve one-way airflow board, middle orifice plate and the lower apron that top-down assembled into an organic whole and communicate in proper order, be equipped with the air inlet on the upper cover plate, be equipped with the gas outlet on the apron down, be equipped with the mounting groove on the apron down, middle orifice plate insert in the mounting groove and under lap between form down the cavity, form the cavity between middle orifice plate and the tesla valve one-way airflow board, install the fan on the middle orifice plate, the entry of fan is located the cavity and communicates through middle orifice plate lower cavity, export intercommunication gas outlet.
Furthermore, a manifold is arranged on the upper cover plate and comprises an air inlet pipe and a plurality of air outlet pipes, one end of the air inlet pipe is in butt joint with the air inlet, an intermediate air pipe is bridged between the other end of the air inlet pipe and the air outlet pipes, and the sectional area of the air inlet pipe is larger than the sum of the sectional areas of the air outlet pipes and larger than the sectional area of an inlet of the fan.
Furthermore, the tesla valve one-way airflow plate is provided with tesla valve one-way channels with the same number as the air outlet pipes, the positive direction inlets of the tesla valve one-way channels are butted with the air outlet pipes, and the positive direction outlets of the tesla valve one-way channels are butted with the middle pore plate.
Furthermore, the middle orifice plate comprises a middle plate, and a plurality of thin tubes and thick tubes which are vertically arranged on the middle plate, wherein the number of the thick tubes is the same as that of the tesla valve one-way channels, one ends of the thick tubes are in butt joint with a forward outlet of the tesla valve one-way channel, and the other ends of the thick tubes are communicated with the lower chamber; the thin tube is communicated with the upper cavity and the lower cavity; the sum of the sectional areas of the thick pipes and the sum of the sectional areas of the thin pipes are both larger than the sectional area of the inlet of the fan.
Further, the length that tubule and thick pipe are located the intermediate lamella below is greater than the length that is located the intermediate lamella top, just the lower extreme of tubule is higher than the lower extreme of thick pipe to form the expansion silencer with the lower chamber.
Furthermore, the length of the tubule or the distance from the lower end of the tubule to the bottom surface of the lower chamber is one fourth of the wavelength tube needing noise elimination, so that the sound waves flowing out of the lower end of the tubule are reflected and superposed and then are cancelled in opposite phases.
Furthermore, a rectification guide vane is fixedly arranged in the thick pipe.
Furtherly, the center of intermediate lamella is equipped with the installation cavity with fan looks adaptation, the fan is turbofan and inlays the dress in the installation cavity, the interference is equipped with rubber seal ring between turbofan's fuselage outer wall and the installation cavity, rubber seal mouth is installed to the interference between turbofan's air outlet outer wall and the installation cavity.
Further, the motor of fan extends to cavity and exposes cavity under to, the motor is equipped with the motor line, be equipped with the line hole of cavity under the intercommunication on the apron down, the motor line pass the line hole and with the line hole between seal installation have soft silica gel stopper.
Furthermore, the distance between the lower end of the thick pipe and the bottom surface of the lower cavity is 5-10 mm, so that air flow can flow through the motor shell as far as possible, and the heat dissipation effect is improved.
Furthermore, the bottom of the Tesla valve one-way airflow plate is provided with a circular frustum which is over against the inlet of the fan.
Further, be equipped with down on the apron and fall the room of making an uproar, fall the room of making an uproar and include baffle and U type return bend, the baffle will fall the room of making an uproar and separate into two independent and two cavitys of variation in size, U type return bend runs through the export of baffle and intercommunication air outlet and fan, a plurality of apertures have evenly been seted up on the outer wall that U type return bend is located two cavity regions.
By adopting the technical scheme, the invention has the following beneficial effects:
(1) The invention has the advantages that through the arrangement of the one-way airflow plate of the Tesla valve, when the forward conduction is carried out, the branch flow speed direction in the channel and the main flow speed direction form an acute angle, the acceleration effect is played on the main flow, and when the reverse conduction is carried out, the branch flow speed direction in the channel and the main flow speed direction form an obtuse angle, the deceleration effect is played on the main flow, so the one-way circulation of the airflow is difficult to carry out, because the noise is also transmitted through the airflow, when the noise generated by the work of the fan is reversely transmitted to an inlet through an outlet of the Tesla one-way airflow plate, most of the noise transmission direction is opposite to the airflow speed direction, the noise intensity is obviously weakened, and the transmission direction of the other part of the noise after entering the branch flow of the Tesla one-way airflow plate and the noise transmission direction in the main flow are obtuse angles, the interference cancellation is generated, and the noise intensity is weakened, thereby the problem of high noise of the sponge-free air source box in the prior industry is solved.
(2) The upper cover plate of the invention is provided with the manifold, the airflow of the air inlet flows through the air inlet pipe and the middle air pipe and then flows out of the air outlet pipe, thereby being uniformly divided into a plurality of airflows, creating uniform inflow conditions for subsequent runners, ensuring the flow of the airflow to be controlled by the fan without being limited by other structures by limiting the sectional area of each air pipe, and meeting the use requirement of large flow.
(3) The tesla valve one-way airflow plate is provided with the plurality of tesla valve one-way channels, so that airflow is dispersed and drained, noise is dispersed, noise generated by airflow flowing is reduced, and the processing effect of fan noise is improved.
(4) The middle orifice plate is provided with a positive outlet of a thick pipe communicated with a one-way channel of the Tesla valve, so that airflow flows into the lower chamber, the effect of resistance noise elimination is achieved after the airflow is changed once in cross section, and then the airflow enters the upper chamber above the middle orifice plate through the thin pipe and is changed once again in cross section, and the effect of resistance noise elimination is also achieved, so that noise is further reduced.
(5) The invention arranges the rectifying guide vane in the thick pipe, which effectively prevents the airflow from generating vortex to increase the noise of the airflow.
(6) According to the invention, the installation cavity is arranged on the middle plate to provide an installation space for the fan, so that the whole structure is smaller and more compact, the installation gap is sealed through the rubber sealing ring and the rubber sealing port, and the air flow of the lower cavity can be ensured to completely enter the upper cavity through the thin tube.
(7) The motor of the fan is exposed in the lower chamber, so that the fan can radiate the motor during airflow exchange, and the service life of the motor is prolonged.
(8) The invention is provided with the circular frustum which is right opposite to the inlet of the fan, plays a role in rectifying the flow field of the inlet of the fan, provides a more uniform inlet flow field and further reduces the noise.
(9) The invention is also provided with a noise reduction chamber, the U-shaped bent pipe with the opening and two closed cavity regions form two Helmholtz resonance silencers with different frequencies, so that better silencing effect can be realized, noise enters the cavity through the small hole after entering the U-shaped bent pipe and is reflected for multiple times, sound waves are superposed and cancelled, meanwhile, air in the two cavities has certain compressibility, namely two flexible glue wraps the U-shaped bent pipe, so that air flow can absorb fluctuation energy of air pressure when flowing, the volumes of the two cavities are different, and the noise with different frequencies can be eliminated through resistance noise elimination, so that the noise can be effectively reduced.
Drawings
In order that the manner in which the present invention is more fully understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, wherein:
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a rear view of the present invention;
FIG. 3 is an exploded view of the present invention;
FIG. 4 is a schematic view of the internal structure of the present invention;
FIG. 5 is a schematic view of the manifold structure of the upper cover plate of the present invention;
FIG. 6 is a schematic forward guide view of a one-way airflow plate of the Tesla valve of the present invention;
FIG. 7 is a schematic view of the reverse conductance of the Tesla valve one-way airflow plate of the present invention;
FIG. 8 is a perspective view of the intermediate aperture plate and fan of the present invention after assembly;
fig. 9 is a schematic view of the internal structure of the noise reduction chamber of the present invention.
The reference numbers in the drawings are:
the device comprises an upper cover plate 1, an air inlet pipe 1-1, an air outlet pipe 1-2, a middle air pipe 1-3, a Tesla valve one-way airflow plate 2, a Tesla valve one-way channel 2-1, a circular frustum 2-2, a middle orifice plate 3, a middle plate 3-1, a thin pipe 3-2, a thick pipe 3-3, a rectification guide vane 3-4, an annular boss 3-5, a lower cover plate 4, an installation groove 4-1, an air inlet 5, an air outlet 6, a fan 7, a rubber sealing ring 8, a rubber sealing opening 9, a wire hole 10, a noise reduction chamber 11, a partition plate 11-1, a U-shaped bent pipe 11-2 and a small hole 11-2-1.
Detailed Description
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
(example 1)
The low-noise respirator air source box shown in fig. 1 to 9 comprises an upper cover plate 1, a tesla valve one-way airflow plate 2, a middle pore plate 3 and a lower cover plate 4 which are assembled into a whole from top to bottom and are sequentially communicated, wherein an air inlet 5 is arranged on the rear side of the upper cover plate 1, an air outlet 6 is arranged on the front side of the lower cover plate 4, meanwhile, a mounting groove 4-1 is arranged on the top of the lower cover plate 4, the middle pore plate 3 is inserted into the mounting groove 4-1 and forms a lower chamber with the lower cover plate 4, an upper chamber is formed between the middle pore plate 3 and the tesla valve one-way airflow plate 2, a fan 7 is arranged on the middle pore plate 3, an inlet of the fan 7 is positioned in the upper chamber and is communicated with the lower chamber through the middle pore plate 3, and an outlet is communicated with the air outlet 6. The air flow enters the upper cover plate 1 from the air inlet 5, enters the lower chamber through the Tesla valve one-way airflow plate 2 and the middle pore plate 3, flows into the upper chamber through the middle pore plate 3, and finally flows out from the fan 7 and the air outlet 6. Through adopting the one-way airflow plate 2 of the Tesla valve, the noise intensity of the air source box can be effectively weakened, and the problem of high noise of a sponge-free air source box in the prior art is solved.
Specifically, as shown in fig. 5, a manifold composed of an air inlet pipe 1-1, air outlet pipes 1-2, and an intermediate air pipe 1-3 is disposed on the upper cover plate 1, wherein the air inlet pipe 1-1 is a straight circular pipe with a larger diameter, the air outlet pipes 1-2 are straight circular pipes with a smaller diameter and are arranged in three parallel equidistant distributions, the intermediate air pipe 1-3 includes an arc pipe and a straight pipe perpendicular to and communicated with the three air outlet pipes 1-2, the middle of the arc pipe is communicated with the air inlet pipe 1-1, two ends of the arc pipe are communicated with the straight pipes, the air inlet pipe 1-1 and the air outlet pipes 1-2 are bridged by the intermediate air pipe 1-3, so as to form a three-turn manifold, the other end of the air inlet pipe 1-1 is in butt joint with the air inlet 5, and the air pipes and the inlet/outlet are in arc transition. When air is fed, the air flow of the air inlet pipe 1-1 uniformly enters the middle air pipe 1-3 and is divided into two parts. The middle air pipe 1-3 is further led into the three air outlet pipes 1-2 at the back, and the air flow is evenly divided into three strands. The design of one-to-three manifolds ensures that the airflow of the three air outlet pipes 1-2 is consistent, and creates uniform inflow conditions for the following runners. Meanwhile, in order to ensure that the flow of the air flow is not limited by a manifold structure, the sectional area of the air inlet pipe 1-1 is larger than the sum of the sectional areas of the three air outlet pipes 1-2 and is larger than the sectional area of an inlet of the fan 7.
Three tesla valve one-way channels 2-1 are arranged on the tesla valve one-way airflow plate 2, and a circular frustum 2-2 which is right opposite to the inlet of the fan 7 is arranged at the bottom of the tesla valve one-way airflow plate, so that the effect of rectifying the flow field of the inlet of the fan 7 is achieved, a more uniform inlet flow field is provided, and the noise is further reduced. As shown in fig. 6 and 7, when conducting in the forward direction, the branch flow velocity direction in the channel of the tesla valve one-way passage 2-1 forms an acute angle with the main flow velocity direction, which accelerates the main flow, and when conducting in the reverse direction, the branch flow velocity direction in the channel forms an obtuse angle with the main flow velocity direction, which decelerates the main flow, so that it is difficult to conduct, and realizes the one-way flow of the air flow.
The middle orifice plate 3 includes a middle plate 3-1, and a plurality of thin tubes 3-2 and thick tubes 3-3 vertically provided on the middle plate 3-1. The length of the thin tube 3-2 and the thick tube 3-3 below the middle plate 3-1 is larger than that above the middle plate 3-1, and the lower end of the thin tube 3-2 is higher than that of the thick tube 3-3, so that the expansion type silencer is formed with the lower chamber. The length of the thin tube 3-2 or the distance from the lower end of the thin tube 3-2 to the bottom surface of the lower chamber is one fourth of the wavelength tube with the noise frequency to be eliminated, so that the sound waves flowing out of the lower end of the thin tube 3-2 are reflected and superposed and then are subjected to phase reversal cancellation. The center of the middle plate 3-1 is provided with an installation cavity matched with the fan 7, so that an installation space is provided for the fan 7, and the whole structure is smaller and more compact. The thick pipe 3-3 is provided with three pipes and is positioned at the right side of the installation cavity, the upper end of the thick pipe is respectively butted with the forward outlets of the three tesla valve one-way channels 2-1, the lower end of the thick pipe extends to the lower cavity, and the forward inlets of the three tesla valve one-way channels 2-1 are respectively butted with three air outlet pipes 1-2. The thin tubes 3-2 are fully distributed at other vacant positions of the middle plate 3-1 and are distributed as uniformly as possible, and two ends of the thin tubes are communicated with the upper chamber and the lower chamber. When the airflow flows into the lower cavity through the thick pipe 3-3, the airflow has a resistance noise elimination effect after a section change, and then enters the upper cavity above the middle orifice plate 3 through the thin pipe 3-2, and the airflow has a resistance noise elimination effect after a section change, so that the noise is further reduced. In order to ensure the flow rate, the sum of the sectional areas of the thick pipes 3-3 and the thin pipes 3-2 is larger than the inlet sectional area of the fan 7. The inner part of the thick pipe 3-3 is fixedly provided with a rectification guide vane 3-4, so that the airflow is effectively prevented from generating vortex to increase the airflow noise.
The fan 7 is a turbine fan and is embedded in the installation cavity, the bottom of the installation cavity is provided with an annular boss 3-5, and a rubber sealing ring 8 is arranged between the annular boss 3-5 and the outer wall of the machine body in an interference manner. A clamping groove with a T-shaped section is arranged at the position, corresponding to the air outlet of the turbofan, of the mounting cavity, and a rubber sealing port 9 which is sleeved on the outer wall of the air outlet of the turbofan in an interference manner is arranged in the clamping groove. Therefore, sealing of a mounting gap between the fan 7 and the mounting cavity is achieved, and it is ensured that air flow of the lower cavity can enter the upper cavity from the thin tube 3-2 completely. The motor of the fan 7 extends to the lower chamber and is exposed in the lower chamber, and when the airflow of the lower chamber is exchanged, the motor is simultaneously radiated, so that the service life of the motor is prolonged. The distance between the lower end of the thick pipe 3-3 and the bottom surface of the lower chamber is 5-10 mm, and 6mm is preferred in the embodiment, so that the airflow flowing out of the lower end of the thick pipe 3-3 flows through the shell of the motor as much as possible, and the heat dissipation effect is further improved. The motor is equipped with the motor line, is equipped with the line hole 10 of cavity under the intercommunication on the apron 4 down, and the motor line passes line hole 10 and with the sealed mounting between the line hole 10 have soft silica gel stopper, ensures that the air current can not see through line hole 10 and flow out.
In order to further reduce noise, the lower cover plate 4 of the present embodiment is further provided with a noise reduction chamber 11 located at the front side of the installation groove 4-1. As shown in fig. 9, the noise reduction chamber 11 includes a partition plate 11-1 and a U-shaped bent pipe 11-2, the partition plate 11-1 divides the noise reduction chamber 11 into two independent cavities with different sizes, the U-shaped bent pipe 11-2 penetrates through the partition plate 11-1 and is communicated with the air outlet 6 and the outlet of the fan 7, and the air flow flowing out of the fan 7 flows out of the air outlet 6 after passing through the U-shaped bent pipe 11-2. The U-shaped bent pipe 11-2 is located on the outer wall of the two cavity regions and is evenly provided with a plurality of small holes 11-2-1, the U-shaped bent pipe 11-2 with the small holes and the two closed cavity regions form Helmholtz resonance silencers with two different frequencies, a better silencing effect can be realized, when noise enters the U-shaped bent pipe 11-2 and then enters the cavity through the small holes 11-2-1 for multiple reflection, the superposition of sound waves is cancelled, meanwhile, air in the two cavities has certain compressibility, which is equivalent to that the U-shaped bent pipe is wrapped by two pieces of soft rubber with certain elasticity, the air flow can absorb fluctuation energy of air pressure when flowing, the volumes of the two cavities are different, and the noise with different frequencies can be eliminated through resistant denoising, so that the noise can be further effectively reduced.
The embodiment disperses the airflow through the manifold on the upper cover plate 1, an even inflow condition is created for the runner at the back at the same time, the noise reduction is carried out for the first time through the one-way airflow plate 2 of the Tesla valve, the structural design through the middle orifice plate 3 is adopted, when the airflow flows through the lower chamber and the upper chamber, the noise reduction is realized for the second time, then the airflow flows into the noise reduction chamber 11 through the fan 7, the noise reduction is realized for the third time, the problem of high noise of a sponge-free air source box in the current industry is solved, the noise of the sponge-free air source box is reduced to be lower than 30dB, no foam pulverization risk is caused, the safety is greatly improved, the maintenance is avoided at the same time, and the later-stage use cost is low.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a low noise breathing machine air supply box which characterized in that: the upper cover plate, the Tesla valve one-way airflow plate, the middle pore plate and the lower cover plate are assembled into a whole from top to bottom and are sequentially communicated, an air inlet is formed in the upper cover plate, an air outlet is formed in the lower cover plate, a mounting groove is formed in the lower cover plate, the middle pore plate is inserted into the mounting groove and forms a lower cavity between the lower cover plate, an upper cavity is formed between the middle pore plate and the Tesla valve one-way airflow plate, a fan is installed on the middle pore plate, an inlet of the fan is located in the upper cavity and is communicated with the lower cavity through the middle pore plate, and the outlet is communicated with the air outlet.
2. The low noise ventilator gas supply cartridge of claim 1, wherein: the upper cover plate is provided with a manifold, the manifold comprises an air inlet pipe and a plurality of air outlet pipes, one end of the air inlet pipe is in butt joint with the air inlet, an intermediate air pipe is bridged between the other end of the air inlet pipe and the air outlet pipes, an intermediate air pipe is bridged between the air outlet pipes, and the sectional area of the air inlet pipe is larger than the sum of the sectional areas of the air outlet pipes and larger than the inlet sectional area of the fan.
3. A low noise ventilator gas supply cartridge as defined in claim 2, wherein: the Tesla valve one-way airflow plate is provided with Tesla valve one-way channels with the same quantity as the air outlet pipes, the forward inlets of the Tesla valve one-way channels are in butt joint with the air outlet pipes, and the forward outlets of the Tesla valve one-way channels are in butt joint with the middle orifice plate.
4. A low noise ventilator gas supply cartridge as defined in claim 3, wherein: the middle pore plate comprises a middle plate, and a plurality of thin tubes and thick tubes which are vertically arranged on the middle plate, wherein the number of the thick tubes is the same as that of the Tesla valve one-way channels, one end of each thick tube is in butt joint with a forward outlet of the Tesla valve one-way channel, and the other end of each thick tube is communicated with the lower cavity; the thin tube is communicated with the upper cavity and the lower cavity; the sum of the sectional areas of the thick pipes and the sum of the sectional areas of the thin pipes are both larger than the sectional area of the inlet of the fan.
5. A low noise respirator gas supply cartridge according to claim 4, wherein: the length that tubule and thick pipe are located the intermediate lamella below is greater than the length that is located the intermediate lamella top, just the lower extreme of tubule is higher than the lower extreme of thick pipe.
6. A low noise respirator gas supply cartridge according to claim 4, wherein: and a rectifying guide vane is fixedly arranged in the thick pipe.
7. A low noise breathing machine air supply cartridge as defined in claim 4 wherein: the center of intermediate lamella is equipped with the installation cavity with fan looks adaptation, the fan is turbofan and inlays the dress in the installation cavity, the interference is equipped with rubber seal ring between turbofan's fuselage outer wall and the installation cavity, rubber seal mouth is installed to the interference between turbofan's air outlet outer wall and the installation cavity.
8. A low noise breathing machine air supply cartridge as defined in claim 7 wherein: the motor of fan extends to cavity and exposes cavity under to, the motor is equipped with the motor line, be equipped with the line hole of cavity under the intercommunication on the apron down, the motor line pass the line hole and with the line hole between sealing installation have soft silica gel stopper.
9. A low noise breathing machine air supply cartridge as defined in claim 1, wherein: the bottom of the Tesla valve one-way airflow plate is provided with a circular frustum which is over against the inlet of the fan.
10. A low noise breathing machine air supply cartridge as defined in claim 1, wherein: be equipped with down on the apron and fall the room of making an uproar, it includes baffle and U type return bend to fall the room of making an uproar, the baffle will fall the room of making an uproar and separate into two cavities of independent and variation in size, U type return bend runs through the export of baffle and intercommunication air outlet and fan, a plurality of apertures have evenly been seted up on the outer wall that U type return bend is located two cavity regions.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211111182.0A CN115507065A (en) | 2022-09-13 | 2022-09-13 | Low-noise breathing machine air source box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211111182.0A CN115507065A (en) | 2022-09-13 | 2022-09-13 | Low-noise breathing machine air source box |
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| Publication Number | Publication Date |
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| CN115507065A true CN115507065A (en) | 2022-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211111182.0A Pending CN115507065A (en) | 2022-09-13 | 2022-09-13 | Low-noise breathing machine air source box |
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Cited By (1)
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| CN117738925A (en) * | 2023-12-15 | 2024-03-22 | 广东绿岛风空气系统股份有限公司 | Wind-proof device for indoor and outdoor scavenger fan |
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