CN107084469B - Double-air-duct noiseless exhaust device based on sound wave interference - Google Patents

Double-air-duct noiseless exhaust device based on sound wave interference Download PDF

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CN107084469B
CN107084469B CN201710432704.XA CN201710432704A CN107084469B CN 107084469 B CN107084469 B CN 107084469B CN 201710432704 A CN201710432704 A CN 201710432704A CN 107084469 B CN107084469 B CN 107084469B
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air
exhaust
duct
channel
fan
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CN107084469A (en
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陈宇翔
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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
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F24F7/065—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit fan combined with single duct; mounting arrangements of a fan in a duct
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/0001—Control or safety arrangements for ventilation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • 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
    • F24F2013/247—Active noise-suppression
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Signal Processing (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Duct Arrangements (AREA)

Abstract

The invention belongs to the technical field of air exhaust equipment, and particularly relates to a double-air-duct noiseless air exhaust device based on sound wave interference. The invention provides a double-air-channel noiseless exhaust device based on sound wave interference, which comprises air channels which are adjacently arranged and carry out synchronous exhaust and a control device for controlling synchronous work, wherein a fan is arranged at the center in each air channel, a spiral wire groove is arranged on the inner wall of the air channel between the fan and an exhaust mask, the two ends of the spiral wire groove are open, the middle of the spiral wire groove is closed, an indoor exhaust mask is arranged at an air inlet of the air channel, a mask control motor is arranged on the indoor exhaust mask, a check valve is arranged at the other end of the air channel, and a rain-proof cap is arranged outside the check valve. The invention uses double air ducts to increase the ventilation sectional area, reduces the wind speed under the condition of meeting the ventilation quantity, forms sound wave interference by the spiral line groove on the inner wall of the air duct, reduces or even eliminates the noise, and the two low-power exhaust fans work synchronously, thereby reducing the working noise of the exhaust fans to the minimum and ensuring the enough ventilation quantity at the same time.

Description

Double-air-duct noiseless exhaust device based on sound wave interference
Technical Field
The invention belongs to the technical field of air exhaust equipment, and particularly relates to a double-air-duct noiseless air exhaust device based on sound wave interference.
Background
At present, with the development of the ventilation industry of Chinese buildings, particularly under the promotion of haze, a fresh air system gradually enters the visual field of people and begins to enter thousands of households. The fresh air system is an independent air processing system consisting of an air supply system and an air exhaust system, outdoor fresh air is filtered and then sucked indoors, indoor polluted air is exhaled and exhausted outdoors, indoor air is replaced, cleanliness of indoor air is kept, a clean, oxygen-enriched and healthy home environment is provided, and health of family members is protected.
The current fresh air system also has the problems of noise pollution, air exchange effect and the like in home installation. In order to ensure the ventilation effect, an air outlet is required to be arranged in the bedroom. The noise that the air exit during operation produced can seriously influence people's rest in the bedroom.
Chinese patent CN105351225A discloses a low-noise classroom fan, which comprises a motor, a fixing base disposed at the lower end of the motor, a fan blade connected to the fixing base, blocking covers connected to the left and right sides of the fixing base, and a noise reduction unit fixed around the fan blade. In the invention, the baffles arranged at the left side and the right side of the fixed seat can guide wind. Acoustic wave sensing device, processing chip, and acoustic wave generation
The device can generate sound waves with the same size as noise and opposite wave phases, and reduce the noise according to the interference principle of the waves, thereby achieving the effect of noise reduction.
Chinese patent CN101789360A discloses a controllable bidirectional cross-circulation ventilation device, comprising a left ventilation pipe, a right ventilation pipe, a hollow closed chamber, and an air inlet duct, an air outlet duct, and a fan arranged outside the chamber, wherein the left ventilation pipe and the right ventilation pipe respectively extend into the chamber and are positioned at two sides of the chamber, the side walls of the left ventilation pipe and the right ventilation pipe corresponding to each other are respectively provided with a vent hole, the air inlet duct is arranged in parallel with the air outlet duct, the air inlet duct comprises a left air inlet duct and a right air inlet duct which are communicated with each other, the air outlet duct comprises a left air outlet duct and a right air outlet duct which are communicated with each other, the left air inlet duct and the left air outlet duct are communicated with the left ventilation pipe through a duct interface, the right air inlet duct and the left air outlet duct are communicated with the right ventilation pipe through a duct interface, the fan has an air outlet and an air inlet, the air inlet of the fan is communicated with the air inlet duct and is positioned between the left air inlet duct and the right air inlet duct, the air outlet of fan with the air-out wind channel intercommunication and be located left air-out wind channel with between the right air-out wind channel, the air intake of fan with be equipped with air inlet valve subassembly between the air inlet wind channel, the air outlet of fan with be equipped with air-out valve subassembly between the air-out wind channel, cavity, left ventilation pipe, left air inlet wind channel, fan, right air-out wind channel, right ventilation pipe communicate each other and form clockwise circulation loop, and cavity, right ventilation pipe, right air inlet wind channel, fan, left air-out wind channel, left ventilation pipe communicate each other and form anticlockwise circulation loop.
Above-mentioned patent still can not effectively be solved, the noise pollution that still exists in present new trend system in the family installation, problem that the ventilation effect is not good.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a novel air-conditioning system which solves the problem of noise of an air outlet of a fresh air system, can solve the problems of noise pollution and poor air exchange effect of the fresh air system in household installation,
in order to solve the problems, the invention provides a double-air-channel noiseless exhaust device based on sound wave interference, which comprises air channels which are adjacently arranged and used for synchronously exhausting air and a control device for controlling synchronous work, and is characterized in that a fan is arranged at the center in each air channel, a spiral wire groove is arranged on the inner wall of each air channel, at least more than one rotation number of the spiral wire groove is arranged, openings are formed in two ends of each spiral wire groove, the middle of each spiral wire groove is sealed, an indoor exhaust mask is arranged at an air inlet of each air channel, a mask control motor is arranged on each indoor exhaust mask, a check valve is arranged at the other end of each air channel, and a rain-proof cap is arranged outside each check valve.
According to the preferred technical scheme, the fan comprises fan blades arranged on a machine shaft, the machine shaft is provided with a synchronizer and a balancing weight, and the balancing weight is provided with an offset screw.
According to the preferable technical scheme, the two air ducts are arranged in parallel, and the thickness ranges of the air ducts are as follows: 5 ~ 10mm, the diameter range is 95 ~ 110mm, the internal diameter scope in wind channel is: 85-105 mm.
According to the preferable technical scheme, the distance between the central holes of the two air channels is an odd multiple of the numerical value within the range of 150-240 mm.
According to the preferable technical scheme, the inner wall of the air duct is arranged between the fan and the indoor exhaust mask and is tightly arranged, the connecting line of the openings at two ends of the spiral duct is parallel to the central line of the air duct, the interval range is 20-80mm, the number of rotation turns of the spiral duct is 1-4 turns, the length range of the spiral duct is 300-1300mm, and the depth range and the width range of the spiral duct are 2-3 mm.
According to the preferable technical scheme, the wind speed range of the fan in the air duct is 0.3-1.8 m/s.
According to the preferable technical scheme, the two air channels are arranged in an 8-shaped mode, the thickness range of the air channels is 5-10 mm, the diameter value range is 95-110 mm, the inner diameter range of the air channels is 85-105 mm, the numerical range of the center hole distance of the two air channels is odd multiples of the numerical value in the range of 150-240 mm, and the range rotating speed of the fan is 1000-3000 r/s.
In an optimized technical scheme, a control circuit in the control device comprises an interlocking circuit for synchronous work of the fan, a speed regulating circuit for regulating a threshold value of the fan and a corresponding voltage division circuit
Compared with the prior art, the invention has the following beneficial effects:
1. the double air channels are used for increasing the ventilation sectional area, so that the air speed is reduced when the ventilation quantity is adjusted, and the wind noise is reduced or even eliminated.
2. The spiral line groove of wind channel inner wall forms the sound wave and interferes, reduces or even eliminates the noise.
3. Two low-power exhaust fans are adopted to work synchronously, the working noise of the exhaust fans is reduced to the minimum, and meanwhile, enough ventilation quantity is guaranteed.
4. The distance between the two fans is controlled, and based on the sound wave interference principle, the two synchronously working exhaust fans are used as sound wave sources, so that the working noise of the exhaust fans is reduced or even eliminated.
Drawings
FIG. 1 is a three-dimensional structure diagram of a single air duct in the double-air duct noiseless exhaust device based on acoustic interference according to the present invention;
FIG. 2 is a front view of an embodiment 1 of the dual duct noiseless exhaust device based on acoustic interference according to the present invention;
FIG. 3 is a three-dimensional structure diagram of a fan in the dual-duct noiseless exhaust device based on acoustic interference according to the present invention;
FIG. 4 is a front view of the embodiment 2 of the dual-duct noiseless exhaust device based on acoustic interference according to the present invention;
FIG. 5 is a diagram showing the opening state of the air ducts in the dual air duct noiseless exhaust device based on acoustic interference according to embodiment 1 of the present invention;
FIG. 6 is an expanded projection view of the air ducts in the embodiment 1 of the dual air duct noiseless exhaust device based on acoustic interference of the present invention;
FIG. 7 is a circuit diagram of a control device in the dual-duct noiseless exhaust device based on acoustic interference according to the present invention;
FIG. 8 is a schematic view of the exhaust fan and airflow noise in the dual duct noiseless exhaust device based on acoustic interference according to the present invention;
fig. 9 is a schematic diagram of the noise-reduced fan and airflow noise in the dual-duct noiseless exhaust device based on acoustic interference.
Reference numerals
In the figure: 1-indoor exhaust mask, 2-mask control motor, 3-wind channel, 4-check air valve, 5-rain-proof cap, 6-fan, 61-fan blade, 62-synchronizer, 63-crankshaft, 64-deviation adjusting screw, 65-counterweight and 7-spiral line groove.
Detailed Description
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
The invention utilizes the mutual interference effect of sound waves in the transmission process, and the interference phenomenon can occur when the sound waves emitted by two sound sources with the same frequency, the same vibration direction and the same pace are mutually superposed. If the phases of the two waves are the same, the amplitude is increased and the sound pressure is strengthened after the two waves are superposed; on the contrary, the phases of the two waves are opposite, the amplitude of the two waves after being superposed is reduced, the sound pressure is weakened, and if the amplitudes of the two waves are the same, the two waves are completely counteracted. Because of the interference effect of the sound wave, the sound field in the space is always distributed fixedly, so that wave crests and wave troughs are formed, and the effect of a comb filter looks like from a frequency response curve, namely: standing wave phenomenon, which is often referred to in acoustic terminology.
As shown in fig. 1 and fig. 2, the dual-duct noiseless air exhausting device based on acoustic interference provided by the present invention comprises ducts 3 which are adjacently arranged and perform synchronous air exhausting and a control device for controlling synchronous operation, the ducts 3 are in a cylindrical structure, a fan 6 is arranged at the center in each duct 3, a spiral line groove 7 is arranged on the inner wall of each duct 3, at least more than one number of rotation turns of the spiral line groove 7 is arranged, the two ends of the spiral line groove 7 are open and the middle is closed, the spiral line groove 7 is arranged on the inner wall of the duct 3 and is closely arranged between the fan 6 and the indoor air exhausting mask 1, openings A, B are arranged at the two ends of the spiral line groove 7, namely, an opening a and an opening B are parallel to the central line of the duct 3, as shown in fig. 6 and 7, the distance range between the opening a =20-80mm and namely the projection a1 of the opening B and the opening a, preferred values of a are 20, 30, 40, 50, 60, 65 or 80mm, and the specific parameter values are shown in the following tables 1 and 2: the details are as follows, taking a =20mm as an example:
r: radius, 2r =100mm, a: the length between openings A, B;
n: number of revolutions, preferably n =1, 2, 3, 4; c: spiral groove length c =
Figure 675233DEST_PATH_IMAGE001
，
Figure 106607DEST_PATH_IMAGE002
c: the sound wave is divided into two sound waves at the outlet A, namely, the sound wave A ', the sound wave B' has a distance difference when passing to the outlet B,
Figure 67610DEST_PATH_IMAGE002
c = c-a when
Figure 715760DEST_PATH_IMAGE002
c is odd times of half wavelength of the sound wave, namely two sound waves are just opposite and interfere with each other to eliminate noise, and the noise can be reduced after the interference even if complete opposite cannot be formed.
The specific principle is as follows: the noise is divided into two sound waves A 'and B' at the inlet of the sealed spiral line groove 7, the sound wave A 'is continuously transmitted in the air duct 3, the sound wave B' enters the sealed spiral line groove 7, and the two sound waves A 'and B' meet at the outlet of the spiral line groove 7 and form sound wave interference. By controlling the length of the sealed spiral line groove 7, the distance between the sound wave A 'and the sound wave B' from the inlet to the outlet is just equal to half the wavelength of the sound wave, and then the noise corresponding to the wave band can be completely eliminated. When the spiral line grooves 7 on the inner wall of the air duct 3 can form sound wave interference, the noise is reduced or even eliminated.
As shown in fig. 8 and 9, the noise-reduced fan 6 and the airflow noise are smaller than those of the exhaust fan 6 in the dual-duct noiseless exhaust device.
In this example, specific parameter values are shown in tables 1 and 2 below:
numerical value of double-air-duct noiseless exhaust device based on sound wave interference-table 1
Figure 256463DEST_PATH_IMAGE003
Numerical value of double-air-channel noiseless exhaust device based on sound wave interference-table 2
Figure 431092DEST_PATH_IMAGE004
The preferable range of the number of spiral turns of the spiral line groove 7 is 1-4 turns, in this embodiment, the number of spiral turns is 1, 2, 3 or 4 turns, the length range of the spiral line groove 7 is c =300 and 1300mm, and the depth and width ranges of the spiral line groove 7 are 2-3 mm. Wherein, the wind speed range of the fan 6 in the wind channel 3 is 0.3 m/s-1.8 m/s. An air inlet of the air duct 3 is provided with an indoor air exhaust mask 1, the indoor air exhaust mask 1 is provided with a mask control motor 2, the other end of the air duct 3 is provided with a check valve 4, and a rain-proof cap 5 is arranged on the outer side of the check valve 4.
As shown in fig. 3, the fan 6 includes a fan blade 61 disposed on a shaft 63, the shaft 63 is provided with a synchronizer 62 and a counterweight 65, and the counterweight 65 is provided with an offset screw 64.
In this embodiment, the two air ducts 3 are arranged in parallel, and the thickness range r2 of the air duct 3 is as follows: 5 ~ 10mm, 2r1 diameter range is 95 ~ 110mm, the internal diameter scope in wind channel 3 is: 85-105 mm, and the distance between the central holes of the two air ducts 3 is an odd multiple of the numerical value in the range of 150-240 mm.
As shown in fig. 7, the control circuit in the control device includes an interlock circuit for synchronous operation of the fan 6, a speed regulation circuit for adjusting a threshold value of the fan 6, and a corresponding voltage division circuit.
In this embodiment, two wind channels 3 are arranged in parallel, the thickness range of the wind channels 3 is a = 5-10 mm, the radius b = 85-110 mm, and the central hole distance numerical range C1 of the two wind channels 3 is an odd multiple of 65-75 mm. Wherein the rotating speed range of the fan 6 in the air duct 3 is 1000-3000 r/s.
Example 2
As shown in fig. 4, this embodiment is further improved on the basis of embodiment 1, except that in this embodiment, a double-air-duct noiseless exhaust device based on acoustic wave interference is provided, two air ducts 3 are arranged to connect to each other in a structure of "8", where the thickness of the air duct 3 is a =5mm, the radius r =95mm, the distance between the central holes of the two air ducts 3 is C2 is 2e, the distance between the central holes of the two air ducts 3 is an odd multiple of 55 to 70mm, and preferred values of e are: 65mm, the rotating speed of the fan 6 is 1500 rpm/s or 2500 rpm/s, and the effect of reducing or even eliminating noise can be achieved.
The preferred embodiments and examples of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the embodiments and examples described above, and various changes can be made within the knowledge of those skilled in the art without departing from the concept of the present invention.

Claims (6)

1. A double-air-channel noiseless air exhaust device based on sound wave interference comprises air channels (3) which are adjacently arranged and synchronously exhaust air and a control device for controlling synchronous work, and is characterized in that a fan (6) is arranged at the center in each air channel (3), a spiral line groove (7) is formed in the inner wall of each air channel (3), at least more than one number of rotation turns of each spiral line groove (7) is formed, openings are formed in two ends of each spiral line groove (7), the middle of each spiral line groove is sealed, an indoor air exhaust mask (1) is arranged at an air inlet of each air channel (3), a mask control motor (2) is arranged on each indoor air exhaust mask (1), a check valve (4) is arranged at the other end of each air channel (3), and a rain-proof cap (5) is arranged on the outer side of each check valve (4);
the fan (6) comprises fan blades (61) arranged on a crankshaft (63), the crankshaft (63) is provided with a synchronizer (62) and a balancing weight (65), and the balancing weight (65) is provided with an offset adjusting screw (64);
the spiral line groove (7) is provided with an air duct (3), the inner wall of the air duct (3) is arranged between the fan (6) and the indoor exhaust mask (1) and is tightly arranged, the connecting line of openings (A, B) at two ends of the spiral line groove (7) is parallel to the central line of the air duct (3), the interval range is 20-80mm, the number of rotation turns of the spiral line groove (7) is 1-4 turns, the length range of the spiral line groove (7) is 300-1300mm, and the depth and width ranges of the spiral line groove (7) are 2-3 mm;
the calculation formula of the spiral line groove length is c =
Figure 285419DEST_PATH_IMAGE001
Wherein r: diameter of the air duct, n: number of rotations, a: length between openings A, B, c: helical flute length.
2. The double-air-channel noiseless exhaust device based on sound wave interference according to claim 1, characterized in that two air channels (3) are arranged in parallel, and the thickness range of the air channels (3) is as follows: 5 ~ 10mm, diameter range is 95 ~ 110mm, the internal diameter scope in wind channel (3) is: 85-105 mm.
3. The double-air-duct noiseless exhaust device based on sound wave interference according to claim 2 is characterized in that the distance between the central holes of the two air ducts (3) is an odd multiple of the value in the range of 150-240 mm.
4. The double-air-channel noiseless exhaust device based on acoustic interference according to the claim 2 or 3, characterized in that the wind speed range of the fan (6) in the air channel (3) is 0.3 m/s to 1.8 m/s.
5. The double-air-channel noiseless exhaust device based on the acoustic wave interference is characterized in that the two air channels (3) are arranged in an 8 shape, the thickness range of the air channels (3) is 5-10 mm, the diameter value range of the air channels is 95-110 mm, the inner diameter range of the air channels (3) is 85-105 mm, the numerical value range of the central hole distance of the two air channels (3) is an odd multiple of the numerical value range of 150-240 mm, and the range rotating speed of the fan (6) is 1000-3000 r/s.
6. The double-air-channel noiseless air exhaust device based on sound wave interference is characterized in that the control circuit in the control device comprises an interlocking circuit for synchronously working the fans (6), a speed regulating circuit for regulating the threshold value of the fans (6) and a corresponding voltage division circuit.
CN201710432704.XA 2017-06-09 2017-06-09 Double-air-duct noiseless exhaust device based on sound wave interference Expired - Fee Related CN107084469B (en)

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