Classifications

• • 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
  • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
  • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
  • F24F3/16—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by purification, e.g. by filtering; by sterilisation; by ozonisation
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
  • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
  • F24F8/108—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering using dry filter elements
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
  • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
  • F24F8/15—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means
  • F24F8/158—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means using active carbon
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
  • F24F8/80—Self-contained air purifiers
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
  • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
  • G10K11/1785—Methods, e.g. algorithms; Devices
  • G10K11/17857—Geometric disposition, e.g. placement of microphones
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
  • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
  • G10K11/1787—General system configurations
  • G10K11/17873—General system configurations using a reference signal without an error signal, e.g. pure feedforward
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
  • B01D46/42—Auxiliary equipment or operation thereof
  • B01D46/4236—Reducing noise or vibration emissions
• • 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
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
  • G10K2210/10—Applications
  • G10K2210/105—Appliances, e.g. washing machines or dishwashers
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
  • G10K2210/10—Applications
  • G10K2210/109—Compressors, e.g. fans

Definitions

• the invention relates to an indoor air purifier ac- cording to the preamble of claim 1.
• the air purifier is formed by a case-type structure housing one or more different types of fil ⁇ ters and a fan causing air to flow from the space be- ing cleaned through the filters, and back to the space after being purified.
• the purification degree depends on the type, quality and number of the filters used. At least some air purifiers provided with activated carbon filters work very well, removing for instance mould spores and radon almost completely from the air. In an attempt to make air purifiers more and more ef ⁇ ficient, i.e.
• the devices must be made larger and provided with big- ger fans. This increases both motor noise from the ro ⁇ tation of the fan, as well as the swishing sound of the airflow caused by flow resistances of the struc ⁇ tures. Thus, with increased efficiency the drawbacks are also increasing, as the constant and steady hum- ming and swishing of the air are in many cases rather disturbing in otherwise calm and quiet environments, such as classrooms and offices.
• the object of the invention is to remedy the defects of the prior art mentioned above.
• the ob ⁇ ject of the invention is to disclose a new indoor air purifier that is small and light, i.e. easily trans ⁇ portable and movable, yet efficient and quiet enough that it may operate in any facility almost unnoticed.
• the indoor air purifier according to the invention comprises a frame case, for example made of a suitable wood board.
• the shape of the frame case is freely se ⁇ lectable to suit the decor in question; however, from the manufacture point of view a rectangular parallele ⁇ piped is in most cases most preferred.
• a fan and an electric motor for rotating the fan, and at least one filter are housed inside the frame case.
• the frame case is provided with an air inlet and outlet, whereby the fan is arranged to generate an airflow travelling from the inlet via the filter to the out ⁇ let, i.e. to draw air from the inlet to the interior of the frame case and blow out the filtered air from the outlet.
• an active noise reduction arrangement is provided inside the frame case in the airflow between the inlet and the outlet.
• two active noise reduction ar ⁇ rangements are provided in the airflow between the in- let and the outlet, one of them before and the other one after the fan, each one of the active noise reduc ⁇ tion arrangements comprising a microphone and a speak ⁇ er, and the microphone and the respective speaker are located on different sides of the filter before the fan and after the fan.
• two active noise reduction arrangements are provided inside the frame case, one before and the other one after the fan.
• the active noise reduction arrangement com ⁇ prises a microphone provided in the airflow for de ⁇ tecting prevailing noise, and a speaker for forming anti-noise to compensate for the noise detected.
• the active noise reduction arrangement continuously modifies the anti-noise being generated based on the noise made by the air purifier.
• the purifier comprises more than one fil ⁇ ter, such that before the fan there is at least one filter and after the fan there is at least one filter.
• the purifier comprises an activated carbon filter, for example before the fan, and additionally a HEPA filter, for example after the fan.
• a prefilter is arranged for removing larger impurities entrained with the airflow, such as debris, insects and pollen.
• the microphone and the respective speaker are located on different sides of the filter in the airflow passing through the puri- bomb. In another embodiment of the invention the microphone and the respective speaker are located sub ⁇ stantially side by side in proximity to each other in the airflow passing through the purifier. In this case the microphone and the speaker may for example be ar ⁇ ranged in immediate proximity to the fan before the fan and/or after the fan.
• control of the microphone and the respective speaker is provided with delay that is proportional to the distance between the microphone and the speaker.
• the indoor air purifier according to the invention has significant advantages over the prior art.
• the indoor air purifier according to the invention enables air to be purified practically without noise. Further, as the purifier itself may be integrated to the furniture of the space being treated, the invention enables air to be purified completely unnoticeably and non- disturbingly . It will only be noticed from the clean and fresh air of the space.
• schemati- cally illustrates one air purifier according to the invention .
• One air purifier according to the invention as illus- trated in the figure comprises a frame case 1 shaped as a rectangular parallelepiped that is placed upright on a floor 10.
• a fan 2 rotated with an elec ⁇ tric motor.
• the fan 2 is disposed its own space be- tween a horizontal lower partition wall 11 and upper partition wall 12, whereby the fan is able to draw air through an opening 13 of the upper partition wall and blow it down below the lower partition wall.
• the upper edge of the frame case 1 is provided with an inlet 6 and its lower edge is provided with an outlet 7. Thus when the fan is operating the airflow circulates through the interior space of the frame case.
• a hor- izontally disposed first filter i.e. a prefilter 5
• an activated carbon filter 3 with a cylindrical surface.
• the fan 2 there is also a HEPA filter.
• the purifier inside its frame case, there are two active noise reduction arrangements.
• the first one of them is arranged before the fan so that in proximity to the inlet 6 there is a microphone 8 by which pre ⁇ vailing noise in that area, which is mainly noise from the fan and its motor, is detected.
• the microphone is then, via suitable control electron ⁇ ics, connected to a speaker 9 in the space before the fan but after the activated carbon filter, by which speaker anti-noise is directed to this space to compensate for the noise detected with the microphone.
• a speaker 9 in the space before the fan but after the activated carbon filter, by which speaker anti-noise is directed to this space to compensate for the noise detected with the microphone.
• the fan 2 immediately after the fan 2 there is another speaker 9, its corresponding microphone 8 being located below the HEPA filter in proximity to the outlet 7. Because the noise carried out from the puri ⁇ fier comes out from the frame case almost exclusively through the air inlet and outlet 6 and 7, this way, with two active noise reduction arrangements the sound waves coming out from both inlet and outlet can be compensated for, such that the purifier becomes prac ⁇ tically noiseless.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Acoustics & Sound (AREA)
• Multimedia (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Filtering Of Dispersed Particles In Gases (AREA)
• Soundproofing, Sound Blocking, And Sound Damping (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=64660926

Family Applications (1)

Country Status (4)

Cited By (2)

Families Citing this family (1)

Citations (5)

Family Cites Families (4)

• 2017
  • 2017-06-13 FI FI20175548A patent/FI129173B/fi active IP Right Grant
• 2018
  • 2018-06-11 EP EP18818897.3A patent/EP3638958A4/de not_active Withdrawn
  • 2018-06-11 CN CN201880039457.XA patent/CN110741209A/zh active Pending
  • 2018-06-11 WO PCT/FI2018/050436 patent/WO2018229330A1/en unknown

Patent Citations (5)

Non-Patent Citations (1)

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