WO2023196154A1 - Appareil atténuateur de bruit pour une unité de traitement d'air - Google Patents

Appareil atténuateur de bruit pour une unité de traitement d'air Download PDF

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Publication number
WO2023196154A1
WO2023196154A1 PCT/US2023/016877 US2023016877W WO2023196154A1 WO 2023196154 A1 WO2023196154 A1 WO 2023196154A1 US 2023016877 W US2023016877 W US 2023016877W WO 2023196154 A1 WO2023196154 A1 WO 2023196154A1
Authority
WO
WIPO (PCT)
Prior art keywords
sound dampening
axial fan
handling unit
air handling
enclosure
Prior art date
Application number
PCT/US2023/016877
Other languages
English (en)
Inventor
Kevin Mercer
Original Assignee
Rheem Manufacturing Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rheem Manufacturing Company filed Critical Rheem Manufacturing Company
Publication of WO2023196154A1 publication Critical patent/WO2023196154A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/545—Ducts
    • 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
    • F04D29/664—Sound attenuation by means of sound absorbing material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/40—Vibration or noise prevention at outdoor units
    • 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
    • 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
    • G10K11/161—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general in systems with fluid flow
    • 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
    • G10K11/162—Selection of materials
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/38—Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
    • 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
    • F24F2013/242—Sound-absorbing material
    • 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
    • F24F2013/245—Means for preventing or suppressing noise using resonance
    • 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

Definitions

  • HVAC heating, ventilation, and air conditioning
  • Air handlers are commonly used in HVAC systems to regulate and circulate air throughout a building or ventilated space.
  • existing air handling units 100 commonly include an enclosure 102 having an air inlet 104 and an air outlet 106.
  • the enclosure 102 houses a blower 108 (e.g., a centrifugal fan) and a heat exchanger coil 110.
  • the heat exchanger coil 110 is connected via refrigerant lines to an outdoor heat exchanger coil 112 (i.e., a heat exchanger installed in a location outside of, and separate from, the enclosure 102) and is configured to facilitate heat exchange between air passed over the heat exchanger coil 110 and refrigerant that is circulated through the heat exchanger coil 110.
  • an outdoor heat exchanger coil 112 i.e., a heat exchanger installed in a location outside of, and separate from, the enclosure 102
  • various components of the refrigerant system such as a compressor, an expansion valve, and tubing have been omitted.
  • the heat exchanger coil 110 can either remove heat from air that is passed over the heat exchanger coil 110 or add heat to air that is passed over the heat exchanger coil 110.
  • Air is moved over the heat exchanger coil 110 by the blower 108, which draws air into the enclosure 102 through the air inlet 104 and directs the cooled or heated air to the ventilated space through the air outlet 106.
  • Air handling units 100 generally include blowers 108, rather than axial fans, because blowers 108 are capable of producing a high-pressure airflow while outputting comparatively little noise.
  • blowers 108 typically require a large amount of space and, therefore, require a large enclosure 102.
  • blowers 108 are not effective at pushing air across the heat exchanger coil 110 due to their design and the physical constraints of the air handling unit 100. Rather, blowers 108 are generally designed to pull air, which requires the blower 108 to be positioned at a location in the airflow path downstream of the heat exchanger coil 110.
  • Axial fans require less space and are capable of either pulling or pushing air across the heat exchanger coil 110. The comparatively high noise output of axial fans, however, have made it difficult to implement axial fans in existing applications.
  • Some existing solutions to reducing the noise output of axial fans include changing the pitch of the fan blades and increasing the diameter of the axial fan so that the axial fan can be operated at a lower speed. These solutions, however, are not practical for most applications of air handling units because changing the pitch of the fan blades can negatively impact the flow rate of the air through the HVAC system and increasing the diameter of the axial fan can require a larger air handling unit 100 which is generally not feasible.
  • HVAC heating, ventilation, and air conditioning
  • the disclosed technology can include a sound dampening apparatus for an axial fan of an air handling unit.
  • the sound dampening apparatus can include a body having two substantially straight sides converging at a comer and a concave side disposed opposite the comer.
  • the body can be installed in an enclosure of the air handling unit outside of a primary airflow path extending axially through the axial fan and can reduce a noise level of the axial fan.
  • the concave side of the body can face toward the airflow path extending axially through the axial fan such that the concave side conforms to a circumference of the axial fan.
  • the comer of the body can conform to a comer of an enclosure of the air handling unit.
  • the body can have a flame-resistant material.
  • the body can include a foam material, a fiberglass material, or other suitable sound dampening materials.
  • the disclosed technology can include an air handling unit for a heating, ventilation, and air conditioning (HVAC) system.
  • the air handling unit can include a heat exchanger coil that can be configured to facilitate heat exchange between a fluid circulated through the heat exchanger coil and air directed across the heat exchanger coil.
  • the air handling unit can include an axial fan configured to direct the air across the heat exchanger coil and an enclosure configured to house the heat exchanger coil and the axial fan.
  • the air handling unit can include a sound dampening apparatus configured to reduce a noise level of the axial fan.
  • the sound dampening apparatus can be disposed in the enclosure proximate an inside comer of the enclosure and proximate the axial fan such that the sound dampening apparatus is positioned outside of an airflow path extending axially through the axial fan.
  • the sound dampening apparatus can include a body having two substantially straight sides converging at a comer and a concave side disposed opposite the comer.
  • the concave side can face toward the airflow path extending axially through the axial fan such that the concave side conforms to a circumference of the axial fan.
  • the sound dampening apparatus can include a flame-resistant material.
  • the sound dampening apparatus can include a foam material, a fiberglass material, or other suitable sound dampening materials.
  • the sound dampening apparatus can be positioned in the airflow path downstream of the axial fan and/or positioned in the airflow path upstream of the axial fan.
  • the air handling unit can further include a stator positioned in an airflow path downstream of the axial fan.
  • the stator can be configured to straighten an airflow path of the air.
  • the sound dampening apparatus can be positioned in the airflow path downstream of the stator.
  • the air handling unit can include a plurality of sound dampening apparatuses positioned in the airflow path downstream of the axial fan.
  • Each sound dampening apparatus of the plurality of sound dampening apparatuses can be disposed in the enclosure proximate an inside comer of the enclosure and proximate the axial fan such that each sound dampening apparatus can be positioned outside of an airflow path extending axially through the axial fan.
  • the air handling unit can include a plurality of sound dampening apparatuses positioned in the airflow path upstream of the axial fan.
  • Each sound dampening apparatus of the plurality of sound dampening apparatuses can be disposed in the enclosure proximate an inside comer of the enclosure and proximate the axial fan such that each sound dampening apparatus can be positioned outside of an airflow path extending axially through the axial fan.
  • the air handling unit can include a first plurality of sound dampening apparatuses positioned in the airflow path upstream of the axial fan and a second plurality of sound dampening apparatuses positioned in the airflow path downstream of the axial fan.
  • Each sound dampening apparatus of the first and second plurality of sound dampening apparatuses can be disposed in the enclosure proximate an inside comer of the enclosure and proximate the axial fan such that each sound dampening apparatus is positioned outside of an airflow path extending axially through the axial fan.
  • Each sound dampening apparatus of the first and second plurality of sound dampening apparatuses can include a concave side that faces toward the airflow path extending axially through the axial fan such that the concave side conforms to a circumference of the axial fan.
  • the first plurality of sound dampening apparatuses can include four sound dampening apparatuses and the second plurality of sound dampening apparatuses can include four sound dampening apparatuses.
  • the enclosure can include a wall having an inner layer nearest an inside of the enclosure and an outer layer nearest an outside of the enclosure, the inner layer defining a plurality of apertures extending therethrough and a sound dampening material being disposed between the inner layer and the outer layer.
  • FIG. 1 illustrates a schematic diagram of an existing air handling unit of an HVAC system.
  • FTG. 2 illustrates a schematic diagram of an example air handling unit with an axial fan and a sound dampening apparatus, in accordance with the disclosed technology.
  • FIG. 3A illustrates a top view of an example fan mounting deck and example sound dampening apparatuses, in accordance with the disclosed technology.
  • FIG. 3B illustrates a bottom view of an example fan mounting deck and example sound dampening apparatuses, in accordance with the disclosed technology.
  • FIG. 3C illustrates a top view of an example fan mounting deck and another example sound dampening apparatus, in accordance with the disclosed technology.
  • FIG. 4 illustrates an example fan mounting deck and example sound dampening apparatuses and an example enclosure of an air handling unit, in accordance with the disclosed technology.
  • FIG. 5 A illustrates a perspective view of an example enclosure of an air handling unit, in accordance with the disclosed technology.
  • FIG. 5B illustrates a side cutaway view of a wall of an example enclosure of an air handling unit, in accordance with the disclosed technology.
  • the disclosed technology includes a sound dampening apparatus that can be configured to reduce the noise level of an axial fan installed in an air handling unit.
  • the sound dampening apparatus can be installed in an enclosure of the air handling unit and be positioned in one or more comers of the enclosure to ensure the sound dampening apparatus does not impede the air flow through the enclosure.
  • the sound dampening apparatus can be installed in one or more locations upstream and/or downstream of an axial fan such that the sound dampening apparatus is positioned outside of a direct airflow path extending axially through the axial fan.
  • the sound dampening apparatus can be made from foam, fiberglass, or other sound dampening material and can be flame resistant.
  • the sound dampening apparatus can help to reduce the overall noise of the air handling unit by reducing the sound output of the axial fan.
  • the disclosed technology can further include an enclosure having walls that can also be configured to further help reduce the sound output of the axial fan. Further configurations and advantages of the disclosed technology will become apparent throughout this disclosure.
  • Ranges may be expressed herein as from “about” or “approximately” or “substantially” one particular value and/or to “about” or “approximately” or “substantially” another particular value. When such a range is expressed, the disclosed technology can include from the one particular value and/or to the other particular value. Further, ranges described as being between a first value and a second value are inclusive of the first and second values. Likewise, ranges described as being from a first value and to a second value are inclusive of the first and second values.
  • FIG. 2 illustrates a schematic diagram of an air handling unit 200 of an HVAC system having sound dampening apparatus(es) 230.
  • the sound dampening apparatus(es) 230 can be configured to reduce a noise level of the axial fan 222 (i.e., reduce the total sound permitted to exit the air handling unit 200).
  • the disclosed technology can reduce an overall noise output of the air handling unit 200 such that the air handling unit 200 can reasonably be used in residential or commercial applications where an air handling unit 200 with an axial fan 222 would otherwise generate too much noise.
  • the disclosed technology can reduce an overall noise output of the air handling unit 200 having an axial fan 222 such that the air handling unit 200 can output a noise level similar to that of existing residential air handling units.
  • the air handling unit 200 can include an enclosure 202 having a first port 204 and a second port 206.
  • the first and second ports 204, 206 can be configured to facilitate ingress of air into, or egress of air out of, the air handling unit 200, depending on the direction of airflow therethrough.
  • the enclosure 202 can further include an axial fan 222 and a heat exchanger coil 210. As shown, the axial fan 222 can be mounted in the enclosure 202 vertically above the heat exchanger coil 210. Alternatively, the axial fan 222 can be mounted in the enclosure 202 vertically below the heat exchanger coil 210 depending on the application.
  • the axial fan 222 can be any type of axial fan that is configured to move air through the enclosure 202 and through the HVAC system.
  • the axial fan 222 can be a propeller axial fan, a tube axial fan, a vane axial fan, a backward curved axial fan, or any other suitable type of axial fan for the application.
  • the axial fan 222 can be configured to move air or other fluids in an axial direction, parallel to a shaft about which blades of the axial fan 222 rotate.
  • the enclosure 202 can include a fan mounting deck 220 (sometimes referred to interchangeably herein as “fan deck 220”) that can support the axial fan 222.
  • the fan mounting deck 220 can be configured to be removed from the enclosure 202 such that the air handling unit 200 can be converted between an upflow unit or a downflow unit.
  • the heat exchanger coil 210 can be configured to exchange heat with a fluid circulated through the heat exchanger coil 210 and air passed over the heat exchanger coil 210.
  • the heat exchanger coil 210 can be configured to exchange heat between air and refrigerant, air and water, air and combustion gases, etc.
  • the heat exchanger coil 210 is illustrated as being in fluid communication with an outdoor coil 212 such as heat pump or air conditioning system. Although described as being an outdoor coil 212, one of skill in the art will appreciate that the outdoor coil 212 can be located in any suitable location to facilitate heat transfer between the refrigerant and air or another fluid.
  • the outdoor coil 212 can be located outside of a building, inside of a building (e.g., an attic, a garage, etc.), under the ground (e.g., a ground source heat pump), or in any other suitable location for the application.
  • the outdoor coil 212 can be configured to exchange heat between the refrigerant and any suitable fluid (e.g., water, glycol, etc.).
  • the heat exchanger coil 210 and the outdoor heat exchanger coil 212 can each be any type of heat exchanger that can facilitate heat exchange between a fluid and air.
  • the heat exchanger coil 210 can be an A-coil, an N-coil, a Z-coil, a V-Coil, a slab coil, a cased coil, an uncased coil, a microchannel coil, or any other suitable type of heat exchanger for the application.
  • the heat exchanger coil 210 is a V-Coil.
  • the heat exchanged is an N-Coil.
  • the heat exchanger coil 210 can be made of any suitable material for the application.
  • the heat exchanger coil 210 can be made of aluminum, copper, titanium, stainless steel, cupronickel, carbon steel, composite materials, or other suitable materials.
  • the fan mounting deck 220 can include a fan mount extension 228 that can be configured to support the fan mounting deck 220 and the axial fan 222.
  • the fan mount extension 228, for example, can extend outwardly from the fan mounting deck 220 and be configured to rest on a shelf or ledge in the enclosure 202.
  • the fan mount extension 228 can be configured to slide into a recess 214 formed in the wall of the enclosure 202 (as illustrated in FIGs. 4-5B) to support the fan deck 220.
  • the fan mount extension 228 can be configured such that the fan mounting deck 220 can be easily placed in the enclosure 202 in the first orientation or in the second orientation.
  • the air handling unit 200 can include a stator 224 that can be positioned in an airflow path downstream of the axial fan 222 and can be configured to reduce a turbulence and enable straightening of the air downstream of the axial fan 222.
  • the stator 224 can be configured to cause the air moved by the axial fan 222 to straighten as it passes through the stator 224.
  • the sound dampening apparatus(es) 230 can include multiple sound dampening apparatuses 230 or a single sound dampening apparatus 230.
  • the sound dampening apparatus(es) 230 can be sized and positioned such that the sound dampening apparatus(es) 230 can be disposed in a corner of the enclosure 202 of the air handling unit 200 that would otherwise be empty space. Further, the sound dampening apparatus(es) 230 can be positioned such that the sound dampening apparatus(es) 230 can be disposed outside of an airflow stream extending axially through the axial fan 222.
  • the sound dampening apparatus(es) 230 can be disposed between an area where the air flow is directed axially through the axial fan 222 and the wall of the enclosure 202. In this way, the sound dampening apparatus(es) 230 can be configured to help reduce the noise generated by the axial fan 222 without obstructing the flow of the air through the enclosure 202.
  • the sound dampening apparatus(es) 230 can be positioned upstream and downstream of the axial fan 222. Alternatively, the sound dampening apparatus(es) 230 can be positioned only upstream or only downstream of the axial fan 222 depending on the configuration and the desired sound dampening characteristics.
  • the sound dampening apparatus(es) 230 can extend from the fan deck 220 to an end of the enclosure 202 (e.g., the top of the enclosure, the bottom of the enclosure, a first side of the enclosure, a second side of the enclosure, etc.).
  • the sound dampening apparatus(es) 230 can have a height of approximately two inches, three inches, four inches, five inches, six inches, one foot, two feet, or any other suitable height (i.e., distance from the fan deck 220) to sufficiently reduce the noise level of the axial fan 222.
  • the sound dampening apparatus(es) 230 can have an elongated body (i.e., a length of the sound dampening apparatus(es) 230 can be greater than a width of the sound dampening apparatus(es) 230).
  • the sound dampening apparatus(es) 230 can be spaced a distance from the fan deck 220.
  • the sound dampening apparatus(es) 230 can be spaced approximately two inches, three inches, four inches, five inches, six inches, one foot, two feet, or any other suitable distance from the fan deck 220.
  • the sound dampening apparatus(es) 230 can be spaced apart from the fan deck 220, for example, by attached to a bracket, spacer, mounting block, etc. that spaces the sound dampening apparatus(es) 230 from the fan deck 220 and/or being attached directly to the enclosure 202 a distance from the fan deck 220.
  • the sound dampening apparatus(es) 230 can be made of a material configured to dampen the sound produced by the axial fan 222 and other components of the air handling unit 200.
  • the sound dampening apparatus(es) 230 can be made from open cell foam, closed cell foam, fiberglass, mineral wool, polyester fiber, or other suitable sound dampening materials.
  • the sound dampening apparatus(es) 230 can include, be coated with, or be made from, flame resistant material that can reduce the likelihood that the sound dampening apparatus(es) 230 could catch fire.
  • the sound dampening apparatus(es) 230 can be made using any suitable manufacturing process such as 3D printing, injection molding, foam injected, etc.
  • the sound dampening apparatus(es) 230 can be formed prior to assembling the air handling unit 200 or be formed after the air handling unit 200 is assembled (e.g., foam injected into the desired location in the enclosure 202 of the assembled air handling unit 200).
  • FIG. 3A illustrates a top view of a fan mounting deck 220, in accordance with an example of the disclosed technology.
  • the stator 224 can extend from a first edge of the fan deck 220 to a second edge of the fan deck 220.
  • the stator 224 can alternatively be configured such that it is positioned over just the axial fan 222.
  • the stator 224 can have a generally round shape having a diameter approximately the size of the diameter of the axial fan 222.
  • the sound dampening apparatus(es) 230 can be attached to, or disposed proximate to, the stator 224 proximate the comers of the fan deck 220 as shown in FIG. 3A. In this way, the sound dampening apparatus(es) 230 can occupy as much space as possible without obstructing a flow of the air passing through the axial fan 222.
  • FIG. 3B illustrates a bottom view of a fan mounting deck 220, in accordance with an example of the disclosed technology. Similar to the sound dampening apparatus(es) 230 attached to the top of the stator 224, sound dampening apparatus(es) 230 can be attached to, or disposed proximate to, a support plate 226 of the fan deck 220 The support plate 226 can be configured to support the axial fan 222 and help to guide the air to the axial fan 222. For example, the support plate 226 can define an aperture 227 through which the airflow path is formed to guide the air toward the axial fan 222.
  • the sound dampening apparatus(es) 230 can include a concave side 232 that can face in a direction toward the axial fan 222 while the remaining portions of the sound dampening apparatus(es) 230 can face generally toward a comer of the enclosure 202.
  • the sound dampening apparatus(es) 230 can have two straight edges converging towards a comer with a concave side 232 opposite the comer.
  • the sound dampening apparatus(es) 230 can include two generally straight edges that converge at a comer that substantially mirror the comer of the enclosure 202 (e.g., if the corner of the enclosure 202 has an angle of 90 degrees, the sound dampening apparatus(es) 230 can have two sides that converge at a comer of 90 degrees, etc.).
  • the concave side 232 opposite the comer can have a curvature that substantially mirrors the curvature of the axial fan 222 and/or the apertures 227 through the support plate 226.
  • the sound dampening apparatus(es) 230 can conform to the shape of the outer circumference of the axial fan 222 such that the sound dampening apparatus(es) 230 do not obstruct a flow of the air through the axial fan 222.
  • the sound dampening apparatus 230 can be a single continuous component that extends around the interior of the enclosure.
  • two or more sound dampening apparatuses 230 can be formed together or connected to each other to form a single assembly (e.g., a wall can extend between each pair of adjacent sound dampening apparatuses 230 or “comers” such that a unitary structure having a central aperture is defined, as illustrated in FIG.
  • FTGs. 3 A and 3B illustrate the air handling unit 200 having four sound dampening apparatuses 230 disposed above the fan deck 220 and four sound dampening apparatuses 230 disposed beneath the fan deck
  • the disclosed technology can have more or fewer sound dampening apparatuses 230.
  • the air handling unit 200 can have just two sound dampening apparatuses 230 disposed downstream of the axial fan 222 and/or just two sound dampening apparatuses 230 disposed upstream of the axial fan 222.
  • the number and the size of the sound dampening apparatuses 230 can be modified depending on the particular application, the amount of sound dampening desired, and/or the number and type of other components disposed in the air handling unit 200.
  • FIG. 4 illustrates the fan mounting deck 220, the sound dampening apparatus(es) 230, and the enclosure 202 of the air handling unit 200, in accordance with an example of the disclosed technology.
  • the fan deck 220 and the sound dampening apparatus(es) 230 are shown as being removed from the enclosure 202.
  • the fan deck 220 is shown in a downflow configuration (as opposed to the upflow configuration shown in FIG. 2) such that the air is directed from the top of the enclosure 202 to a bottom of the enclosure as indicated by the airflow arrows in FIG. 4.
  • the sound dampening apparatus(es) 230 can extend above and below the fan deck 220 and generally fill a comer of the enclosure between an airflow path extending axially through the axial fan 222 (i.e., extending parallel with axis A) and a wall of the enclosure 202. Only two sound dampening apparatuses 230 are shown attached to the top side of the fan mounting deck 220 and only two sound dampening apparatuses 230 are shown attached to the bottom side of the fan mounting deck 220. As will be appreciated, and as described previously, the disclosed technology can include more or fewer sound dampening apparatuses 230 depending on the particular application.
  • the sound dampening apparatus(es) 230 are illustrated as having a generally straight profile extending from the fan deck 220 (i.e., a cross-sectional shape of the sound dampening apparatus(es) 230 when taken parallel to atop surface of the fan deck 220 does not vary substantially in width or length as it extends from the fan deck 220), it will be appreciated that the sound dampening apparatus(es) 230 can include a contoured or irregular profiled shape (i.e., a cross-sectional shape of the sound dampening apparatus(es) 230 when taken parallel to a top surface of the fan deck 220 can vary in width or length as it extends from the fan deck 220) to help disrupt the sound waves and reduce the overall noise of the axial fan 222. Furthermore, the surface of the sound dampening apparatus(es) 230 can be smooth or textured depending on the particular material and sound dampening characteristics desired.
  • the sound dampening apparatus(es) 230 can extend through the fan deck 220 such that a single sound dampening apparatus 230 can simultaneously extend above and below the fan deck 220.
  • the fan deck 220 can define one or more apertures (not shown) for the sound dampening apparatus(es) 230 to extend therethrough.
  • the sound generated by the axial fan may be further dampened.
  • FIG. 5A illustrates a perspective view of an enclosure 202 while FIG. 5B illustrates a side cutaway view of a wall of an enclosure 202 of an air handling unit 200, in accordance with an example of the disclosed technology.
  • the enclosure 202 can be designed to help further reduce the sound output by the axial fan 222.
  • the enclosure 202 for example can have walls having an inner layer (i.e., a first layer 502A) defining one or more apertures 540 formed therethrough.
  • the apertures 540 can permit sound waves to pass therethrough to help disrupt the sound waves and reduce the overall noise output by the axial fan 222.
  • FIG. 5A illustrates a perspective view of an enclosure 202
  • FIG. 5B illustrates a side cutaway view of a wall of an enclosure 202 of an air handling unit 200, in accordance with an example of the disclosed technology.
  • the enclosure 202 can be designed to help further reduce the sound output by the axial fan 222.
  • the enclosure 202 for example can have walls having an inner layer (
  • the walls of the enclosure 202 can have a first layer 502A and a second layer 502B.
  • the first and second layers 502A, 502B can be made from a rigid material such as sheet metal, plastic, composite material, or other suitable material or combination of materials.
  • the first layer 502A can be configured to face inwardly toward the axial fan 222 and the second layer 502B can be configured to face outwardly from the enclosure 202.
  • the first layer 502A can define an inner surface and the second layer 502B can define an outer surface.
  • a sound dampening material 550 can be disposed between the first layer 502A and the second layer 502B.
  • the sound dampening material 550 can include any suitable sound dampening material such as open cell foam, closed cell foam, fiberglass, mineral wool, polyester fiber, etc.
  • the apertures 540 can extend through just the first layer 502A such that at least portions of sound waves generated by the axial fan 222 can pass through the apertures 540 and contact, or be absorbed by, the sound dampening material 550. In this way, the wall of the enclosure 202 can help to reduce the noise output by the axial fan 222.
  • the wall of the enclosure 202 can include a recess 214 that can be sized to receive the fan mount extension 228.
  • the wall of the enclosure 202 can be configured to support the fan deck 220. Tn other words, the fan deck 220 can be mounted in the enclosure by sliding the fan mount extensions 228 of the fan deck 220 into the recesses 214 formed in the wall of the enclosure 202.
  • Embodiment 1 may include an air handling unit for a heating, ventilation, and air conditioning (HVAC) system, the air handling unit comprising: a heat exchanger coil configured to facilitate heat exchange between a fluid circulated through the heat exchanger coil and air directed across the heat exchanger coil; an axial fan configured to direct the air across the heat exchanger coil; an enclosure configured to house the heat exchanger coil and the axial fan; and a sound dampening apparatus configured to reduce a noise level of the axial fan, the sound dampening apparatus disposed in the enclosure proximate an inside comer of the enclosure and proximate the axial fan such that the sound dampening apparatus is positioned outside of an airflow path extending axially through the axial fan.
  • HVAC heating, ventilation, and air conditioning
  • Embodiment 2 may include Embodiment 1, wherein the sound dampening apparatus comprises an elongated body having two substantially straight sides converging at a comer and a concave side disposed opposite the comer, wherein the concave side faces toward the airflow path extending axially through the axial fan such that the concave side conforms to a circumference of the axial fan.
  • Embodiment 3 may include any of Embodiments 1 to 2, wherein the sound dampening apparatus comprises a flame-resistant material.
  • Embodiment 4 may include any of Embodiments 1 to 3, wherein the sound dampening apparatus comprises a foam material.
  • Embodiment 5 may include any of Embodiments 1 to 4, wherein the sound dampening apparatus comprises a fiberglass material.
  • Embodiment 6 may include any of Embodiments 1 to 5, wherein the sound dampening apparatus is positioned in the airflow path downstream of the axial fan.
  • Embodiment 7 may include any of Embodiments 1 to 6, wherein the sound dampening apparatus is positioned in the airflow path upstream of the axial fan.
  • Embodiment 8 may include any of Embodiments 1 to 7, further comprising a stator positioned in an airflow path downstream of the axial fan, the stator being configured to straighten an air flow path of the air.
  • Embodiment 9 may Embodiment 8, wherein the sound dampening apparatus is positioned in the airflow path downstream of the stator.
  • Embodiment 10 may include any of Embodiments 1 to 9, wherein the air handling unit comprises a plurality of sound dampening apparatuses positioned in the airflow path downstream of the axial fan, wherein each sound dampening apparatus of the plurality of sound dampening apparatuses is disposed in the enclosure proximate an inside comer of the enclosure and proximate the axial fan such that each sound dampening apparatus is positioned outside of an airflow path extending axially through the axial fan.
  • Embodiment 11 may include any of Embodiments 1 to 10, wherein the air handling unit comprises a plurality of sound dampening apparatuses positioned in the airflow path upstream of the axial fan, wherein each sound dampening apparatus of the plurality of sound dampening apparatuses is disposed in the enclosure proximate an inside comer of the enclosure and proximate the axial fan such that each sound dampening apparatus is positioned outside of an airflow path extending axially through the axial fan.
  • Embodiment 12 may include any of Embodiments 1 to 11, wherein the air handling unit comprises: a first plurality of sound dampening apparatuses positioned in the airflow path upstream of the axial fan; and a second plurality of sound dampening apparatuses positioned in the airflow path downstream of the axial fan, wherein each sound dampening apparatus of the first and second plurality of sound dampening apparatuses is disposed in the enclosure proximate an inside comer of the enclosure and proximate the axial fan such that each sound dampening apparatus is positioned outside of an airflow path extending axially through the axial fan.
  • the air handling unit comprises: a first plurality of sound dampening apparatuses positioned in the airflow path upstream of the axial fan; and a second plurality of sound dampening apparatuses positioned in the airflow path downstream of the axial fan, wherein each sound dampening apparatus of the first and second plurality of sound dampening apparatuses is disposed in the enclosure proximate
  • Embodiment 13 may include any of Embodiments 1 to 12, wherein each sound dampening apparatus of the first and second plurality of sound dampening apparatuses comprises a concave side facing toward the airflow path extending axially through the axial fan such that the concave side conforms to a circumference of the axial fan.
  • Embodiment 14 may include any of Embodiments 1 to 13, wherein the first plurality of sound dampening apparatuses comprises four sound dampening apparatuses and the second plurality of sound dampening apparatuses comprises four sound dampening apparatuses.
  • Embodiment 15 may include any of Embodiments 1 to 14, wherein the enclosure comprises a wall having an inner layer nearest an inside of the enclosure and an outer layer nearest an outside of the enclosure, the inner layer defining a plurality of apertures extending therethrough and a sound dampening material being disposed between the inner layer and the outer layer.
  • Embodiment 16 may include a sound dampening apparatus for an axial fan of an air handling unit, the sound dampening apparatus comprising: a body having two substantially straight sides converging at a comer and a concave side disposed opposite the comer, the body configured for installation in an enclosure of the air handling unit outside of a primary airflow path extending axially through the axial fan and configured to reduce a noise level of the axial fan.
  • Embodiment 17 may include Embodiment 16, wherein the concave side is configured to face toward the airflow path extending axially through the axial fan such that the concave side conforms to a circumference of the axial fan, and wherein the comer is configured to conform to a comer of an enclosure of the air handling unit.
  • Embodiment 18 may include any of Embodiments 16 to 17, wherein the body comprises a flame-resistant material.
  • Embodiment 19 may include any of Embodiments 16 to 18, wherein the body comprises a foam material.
  • Embodiment 20 may include any of Embodiments 16 to 19, wherein the body comprises a fiberglass material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Aviation & Aerospace Engineering (AREA)
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Abstract

La technologie divulguée comprend un appareil atténuateur de bruit pour un ventilateur axial d'une unité de traitement d'air. L'appareil atténuateur de bruit peut comprendre un corps ayant deux côtés sensiblement rectilignes convergeant au niveau d'un coin et un côté concave disposé à l'opposé du coin. Le corps peut être installé dans une enceinte de l'unité de traitement d'air à l'extérieur d'un passage d'écoulement d'air primaire s'étendant axialement à travers le ventilateur axial et être configuré pour réduire un niveau de bruit du ventilateur axial.
PCT/US2023/016877 2022-04-07 2023-03-30 Appareil atténuateur de bruit pour une unité de traitement d'air WO2023196154A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202263328323P 2022-04-07 2022-04-07
US63/328,323 2022-04-07

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WO2023196154A1 true WO2023196154A1 (fr) 2023-10-12

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4986170A (en) * 1989-09-21 1991-01-22 M & I Heat Transfer Products Ltd. Air handling system
US20010011007A1 (en) * 2000-01-27 2001-08-02 Salman Akhtar Column fan unit
US6419576B1 (en) * 2001-03-22 2002-07-16 Air Handling Engineering Ltd. Sound attenuating inlet silencer for air supplying fan
US20040150124A1 (en) * 2002-05-17 2004-08-05 M & I Heat Transfer Products Ltd. Outlet silencer for cooling tower, evaporator cooler or condenser

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4986170A (en) * 1989-09-21 1991-01-22 M & I Heat Transfer Products Ltd. Air handling system
US20010011007A1 (en) * 2000-01-27 2001-08-02 Salman Akhtar Column fan unit
US6419576B1 (en) * 2001-03-22 2002-07-16 Air Handling Engineering Ltd. Sound attenuating inlet silencer for air supplying fan
US20040150124A1 (en) * 2002-05-17 2004-08-05 M & I Heat Transfer Products Ltd. Outlet silencer for cooling tower, evaporator cooler or condenser

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