EP4545794A1 - Dispositif de réduction de bruit acoustique pour réduire le rayonnement de bruit généré par un ventilateur d'un système de pompe à chaleur - Google Patents

Dispositif de réduction de bruit acoustique pour réduire le rayonnement de bruit généré par un ventilateur d'un système de pompe à chaleur Download PDF

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Publication number
EP4545794A1
EP4545794A1 EP23205676.2A EP23205676A EP4545794A1 EP 4545794 A1 EP4545794 A1 EP 4545794A1 EP 23205676 A EP23205676 A EP 23205676A EP 4545794 A1 EP4545794 A1 EP 4545794A1
Authority
EP
European Patent Office
Prior art keywords
noise reduction
reduction device
acoustic noise
flow path
heat pump
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP23205676.2A
Other languages
German (de)
English (en)
Inventor
Pierre Gentil
Mohamed IKEN
Zakaria ZERGOUNE
Florian ANTOINE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BDR Thermea Group BV
Original Assignee
BDR Thermea Group BV
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 BDR Thermea Group BV filed Critical BDR Thermea Group BV
Priority to EP23205676.2A priority Critical patent/EP4545794A1/fr
Publication of EP4545794A1 publication Critical patent/EP4545794A1/fr
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • 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
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/12—Sound

Definitions

  • a heat pump comprises noises sources such as compressors and fans.
  • the operation of a heat pump may therefore be considered as disturbing not only for the residents of a house equipped with a heat pump but also for the residents of houses located in the vicinity.
  • sound or noise absorbing walls in the following referred to as acoustic dampening walls.
  • the acoustic dampening walls need to be provided with a fairly large thickness and need to be made of dense material which leads to an increase of the weight and installation space. In this respect, reference is made to DE 20 2022 105 887 U1 .
  • the noise is directly linked to the fan speed and its number of blades.
  • an air duct with acoustic treatment in particular vibro-acoustic treatments, such as vibration plots or foam, or reduce the fan and/or compressor speed,
  • vibro-acoustic treatments such as vibration plots or foam
  • the latter leads to a reduction of the heating or cooling power.
  • One embodiment of the present invention is directed to an acoustic noise reduction device for reducing the radiation of noise generated by a fan of a heat pump system, wherein the fan is creating an air flow and the acoustic noise reduction device comprises :
  • the air flow created by the fan is split up into at least two paths of a different length.
  • the sub-air flows are then brought back together after exiting the device. Due to the combination of the sub-air flows, interferences are introduced into the noise frequencies which reduce the perceived noise generated by the fan.
  • the noise disturbance caused by the heat pump system that is equipped with such an acoustic noise reduction device is thereby reduced.
  • the acoustic noise reduction device may particularly be an airborne fan noise reduction device.
  • the fluidical separation of the first flow path from the second flow path is provided by an air-tight wall.
  • the air-tight wall may be an integral part of the housing or a separate part.
  • An air-tight wall is easy to manufacture at low costs.
  • the air-tight wall generates a reliable fluidical separation which is necessary to ensure the correct phase shift effect of the noise frequencies and the desired reduction of the perceived noise.
  • the difference between the first length and the second length equals ⁇ /2.
  • a 0.
  • ⁇ is the wavelength of the frequency of the noise that should be reduced, or the speed of sound divided by the frequency of the noise that should be reduced. It has been found that the perceived noise is efficiently reduced at this ratio.
  • "c" corresponds to a correction coefficient and can be lower than 0.1, in particular can have the value 0.
  • the volumetric ratio of the air flow flowing through the shorter flow path compared to the air flow flowing through both shorter and longer flow path is between 0.5 to 0.8, preferably between 0.6 and 0.7. It has been found that the perceived noise is efficiently reduced at this volumetric ratio. At the same time the pressure drop of the air flow caused by the acoustic noise reduction device is still within an acceptable range. Likewise, the same advantages can be achieved when a ratio of a cross section of the shorter flow path to a cross section of the air duct (addition of shorter flow path cross section and longer flow path cross section) is between 0.5 to 0.8, preferably between 0.6 and 0.7.
  • the first flow path is formed or delimited by a cylindrical tube.
  • the first flow path can be defined in a simple way which is easy to manufacture.
  • the second flow path runs along a helical course.
  • the length of the second flow path can be chosen in a flexible way by means of the helical course.
  • the second flow path can be significantly prolonged at a limited axial extension.
  • the axial extension of the acoustic noise reduction device can be kept small such that the acoustic noise reduction device can also be employed at limited installation space.
  • the first flow path defines a longitudinal axis and the helix axis of the helical course runs parallel to the longitudinal axis or coincides with the longitudinal axis.
  • the acoustic noise reduction device has a high degree of symmetry and/or revolution geometry which facilitates its production.
  • a plurality of second flow paths run along a helical course.
  • the second lengths of the second flow paths may differ from each other.
  • the noise of a fan of heat pump system may have several maxima at different frequencies.
  • Each helical course of the second flow paths may be optimized to these frequencies.
  • the perceived noise can be efficiently reduced.
  • several second flow paths of identical length forming a multiple revolution helix allow for a better management of the air flow and ensure that the distance of the flow will be compliant with the requirement.
  • the embodiment can have, 3 to 10, in particular 6, second flow paths.
  • An embodiment having a multiple revolution helix is better than an embodiment having a simple revolution helix.
  • the helical course forms a helix angle which is between 5° and 20° with reference to the helix axis. It has been found that an efficient reduction of the perceived noise can be obtained by such a helix angle. At the same time the axial extension of the entire acoustic noise reduction device can be kept low.
  • the acoustic noise reduction device is made of plastic.
  • the acoustic noise reduction device can be made by injection molding and thus in large quantities at low costs.
  • the use of plastic enables a lightweight embodiment of the acoustic noise reduction device and a qualitative sealing between parts and flows.
  • Other manufacturing methods like foaming, extrusion and 3D printing may also be used, in particular, when the acoustic noise reduction device is made of plastic.
  • Another aspect of the present invention is directed to a heat pump system comprising a fan for creating an air flow, the fan being arranged within an air duct, wherein at least one acoustic noise reduction device according to one of the embodiments previously presented is arranged inside the air duct.
  • the air flow created by the fan is split up into two paths of a different length. Consequently, interferences are introduced into the noise frequencies which reduce the perceived noise generated by the fan. The noise disturbance caused by the energy transformation system is thereby reduced.
  • the inventive acoustic noise reduction device makes sense for all heat pump systems having an air flow as a source or destination medium and/or for any heat pump system having a fan (for example for safety reason to avoid refrigerant stagnation if leakage). It can be a heat pump system for cooling (such as airconditioner) or for heating installation sites or both. It includes for example air source heat pump systems for heating and/or cooling application.
  • the inventive acoustic noise reduction device is particularly suited for heat pump systems having air as a destination or source medium and having an air duct.
  • this invention is relevant for heat pump systems which are used as heat pump water heaters.
  • a heat pump water heater is a device to heat domestical hot water and using at least a heat pump to heat the water. This type of device is installed indoor but most of them need air duct for air inlet and/or air outlet. This device can be included in the air duct of such product or directly in the heat pump water heater.
  • the housing and the air duct flush with each other.
  • the entire circumference of the air duct can be used for fastening the housing to the same.
  • a very stable and sealed connection between the housing and the air duct can be established.
  • the duct has an air duct cross sectional surface and the first flow path has a first flow path cross sectional surface, wherein the area ratio between the first cross sectional surface and the air duct cross sectional surface is between 0.5 and 0.8. It has been found that this ratio leads to a very efficient reduction of the perceived noise. At the same time the pressure drop of the air flow caused by the acoustic noise reduction device is still within an acceptable range because the main part of the flow, using the shortest path, is not disturbed.
  • the air duct defines an air duct axis, wherein two or more acoustic noise reduction devices are arranged along the air duct axis.
  • Two or more acoustic noise reduction devices may either be arranged in parallel or in series or in a combination of both.
  • One acoustic noise reduction device may be optimized to a first frequency range while a second one may be optimized to a second frequency range.
  • the perceived noise may be reduced along a broad frequency range.
  • the heat pump system comprises a heat pump.
  • heat pumps are becoming more and more popular as they may help to reduce the CO2-emissions generated for heating and/or cooling.
  • the noise produced by heat pumps is not only disturbing for residents of the given house equipped with a heat pump but also for the residents of neighboring houses.
  • the perceived noise generated by heat pumps equipped with the present acoustic noise reduction device can be significantly reduced which may lead to an increased acceptance of heat pumps.
  • heat pumps must be compliant with noise-emission standards which may be fulfilled with the noise reduction device according to the present invention. Otherwise, heat pumps may not legally be operated in the respective countries or federal states for certain installation site configurations.
  • Another aspect of the present invention is directed to the use of an acoustic noise reduction device according to one of the embodiments discussed above in or for a heat pump system.
  • the technical effects and advantages as discussed with regard to the present device to a large extent also apply to the heat pump system.
  • FIG 1 shows a principle sectional view through a heat pump system 10 having a fan 16 that is located inside an air duct 18 of a cylindrical shape. It should be noted that in a non-shown alternative embodiment the fan 16 may be included in the heat pump system 10 and the air duct 18 connected to the heat pump system by a channel (not shown).
  • the air duct 18 defines an air duct axis AD.
  • the heat pump system 10 is equipped with first acoustic noise reduction device 121 and a second acoustic noise reduction device 121 according to a first embodiment of the present invention. However, in most cases the use of only one acoustic noise reduction device 121 may be sufficient and desirable.
  • the first acoustic noise reduction device 121 is arranged spaced apart from the second acoustic noise reduction device 121 with reference to the air duct axis AD. Thus, the first acoustic noise reduction device 121 and the second acoustic noise reduction device 121 are arranged in series.
  • Figure 1 there is an axial distance between the first acoustic noise reduction device 121 and the second acoustic noise reduction device 121.
  • the first acoustic noise reduction device 121 and the second acoustic noise reduction device 121 are arranged flush and/or coaxial with the air duct 18.
  • the fan 16 is creating an air flow through the air duct 18, thereby generating noise.
  • the air flow hits the first acoustic noise reduction device 121 which has a housing 20 that provides a first flow path 22 and a second flow path 24.
  • the housing 20 comprised an air-tight wall 26 by with the first flow path 22 is separated from the second flow path 24.
  • the first flow path 22 defines a longitudinal axis AL which coincides with the air duct axis AD.
  • the second flow path 24 is annularly enclosing the first flow path 22.
  • the first flow path 22 has a first length L1 and the second flow path 24 has a second length L2.
  • the second length L2 is bigger than the first length L1.
  • the radially inner part of the air flow passes through the acoustic noise reduction device 121 via the first flow path 22 while the radially outer part passed through the acoustic noise reduction device 121 via the second flow path 24.
  • destructive interferences are induced that reduce the perceived noise generated by the fan 16. This phenomenon is repeated when the air flow passes through the second acoustic noise reduction device 121 such that the perceived noise is further reduced.
  • the second device could be of the same design than first, i.e. with same lengths path, or could be different with two different length paths, in orderto reduce noise on different frequencies.
  • the acoustic noise reduction device 121 is constructed such that the exiting flows meet at the end of the respective flow path in phase opposition. When two waves in phase opposition meet, they at least partially destroy each other. The longest channel therefore has a length that is a multiple of the wavelength of the targeted frequency divided by 2.
  • the air duct 18 may only run between the fan 16 and the acoustic noise reduction device 121 (not shown).
  • the heat pump system 10 can comprise merely one acoustic noise reduction device 121.
  • the acoustic noise reduction devices 121 can be identical to each other.
  • the acoustic noise reduction devices 121 could differ in the lengths of the flow paths from each other to reduce noise on different frequencies.
  • ⁇ is the wavelength of the frequency of the noise that should be reduced, or the speed of sound divided by the frequency of the noise that should be reduced.
  • the air duct 18 has an air duct cross sectional surface SD and the first flow path 22 has a first flow path cross sectional surface S1.
  • the best efficiency of the reduction of the perceived noise can be obtained when the area ratio between the first flow path cross sectional surface S1 and the air duct cross sectional surface SD is 0,5.
  • an area ratio between 0.5 and 0.8 has been found to be advantageous. This area ratio influences the volumetric ratio between the part of the air flow flowing through the second flow path 24 and the part of the air flow flowing through the first flow path 22. It has been found that an efficient reduction of the perceived noise can also be obtained when the volumetric ratio is between 0.6 and 0.7.
  • FIGS 2A and 2B show a second embodiment of an acoustic noise reduction device 122 according to the present invention.
  • the air-tight wall 26 has the shape of a cylindrical tube 28 such that the first flow path 22 also has the shape of a cylindrical tube 28.
  • the air-tight separation wall has the shape of a truncated cone, of a polyhedron, of a truncated polyhedron or an ellipsoidlike, paraboloid-like or similar shape.
  • FIG. 2C one second flow path 24 is principally shown in a flat projection not true to scale.
  • the flat projection reveals that the second flow path 24 is inclined by a helix angle ⁇ with respect to the longitudinal axis AL. Helix angles ⁇ between 5° and 20° were found to be a good compromise which on the one hand lead to an effective reduction of the perceived noise but on the other hand still to a compact design of the acoustic noise reduction device 122..
  • Figure 3 is a perspective view of a third embodiment of the acoustic noise reduction device 123 of the present invention.
  • the principle design of the acoustic noise reduction device 123 according to the third embodiment is the same as the one of the acoustic noise reduction device 122 of the second embodiment.
  • the acoustic noise reduction device 123 according to the third embodiment only comprises one second flow path 24 that runs along a helical course 30.
  • FIG 4 a fourth embodiment of the acoustic noise reduction device 124 according to the present invention is shown.
  • the principle design of the acoustic noise reduction device 124 according to the fourth embodiment is the same as the one of the acoustic noise reduction device 122 of the second embodiment.
  • the housing 20 forms a further air-tight wall 26 that is arranged radially outwardly such that the acoustic noise reduction device 124 of the fourth embodiment comprises two first flow paths 22, namely a central, cylindrically shaped first flow path 22 and an annular first flow path 22 enclosing the six second flow paths 24.
  • the longitudinal axis AL of the central first flow path 22 and the annular first flow path 22 coincide.
  • the helix axes AH of the second flow paths 24 coincide with the longitudinal axis AL such that the first flow paths 22 and the second flow paths 24 of the acoustic noise reduction device 124 according to the fourth embodiment are concentrically arranged.
  • a fifth embodiment of the acoustic noise reduction device 125 which comprises one second flow path 24 running along a helical course 30 and one annular first flow path 22 enclosing the second flow path 24.
  • the longitudinal axis AL of the first flow path 22 and the helix axis AH of the second flow path 24 coincide with each other.
  • FIG. 6 a sixth embodiment of the acoustic noise reduction device 126 according to the present invention is illustrated.
  • the basic design of the acoustic noise reduction device 126 according to the sixth embodiment is the same as the one of the acoustic noise reduction device 125 of the fifth embodiment.
  • the helix axis AH runs parallel to the longitudinal axis AL but displaced therefrom.
  • the second flow path 24 runs eccentrically regarding the first flow path 22.
  • the air-tight wall 26 that separates the first flow path 22 from the second flow path 24 is touching the further air-tight wall 26 that encloses the first flow path 22.
  • the housing 20 is also air-tight. This is also true for the other embodiments shown in fig. 1 to 5 .
  • FIG. 7 a seventh embodiment of the acoustic noise reduction device 127 according to the present invention is illustrated.
  • the first flow path 22 has an elliptical cross section and the shape of an elliptical cylinder.
  • the acoustic noise reduction device 127 according to the seventh embodiment comprises two second flow paths 24.
  • Each of the second flow paths 24 are separated by its own air-tight wall 26 from the first flow path 22.
  • the helical axes AH of the second flow paths 24 are laterally displaced.
  • the direction of rotation of the helical courses 30 is opposite.
  • the second length L2 of the two second flow paths 24 is the same, however, could also be different.
  • FIG 8 shows a principle sectional view through a heat pump system 10 according to a second embodiment.
  • Said heat pump system 10 differs from the heat pump system 10 shown in figure 1 in that the heat pump system 10 comprises merely one acoustic noise reduction device 121.
  • the acoustic noise i.e. the frequency
  • the acoustic noise reduction device 121 is configured to reduce said acoustic noise generated by the fan.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP23205676.2A 2023-10-25 2023-10-25 Dispositif de réduction de bruit acoustique pour réduire le rayonnement de bruit généré par un ventilateur d'un système de pompe à chaleur Pending EP4545794A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP23205676.2A EP4545794A1 (fr) 2023-10-25 2023-10-25 Dispositif de réduction de bruit acoustique pour réduire le rayonnement de bruit généré par un ventilateur d'un système de pompe à chaleur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23205676.2A EP4545794A1 (fr) 2023-10-25 2023-10-25 Dispositif de réduction de bruit acoustique pour réduire le rayonnement de bruit généré par un ventilateur d'un système de pompe à chaleur

Publications (1)

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EP4545794A1 true EP4545794A1 (fr) 2025-04-30

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EP23205676.2A Pending EP4545794A1 (fr) 2023-10-25 2023-10-25 Dispositif de réduction de bruit acoustique pour réduire le rayonnement de bruit généré par un ventilateur d'un système de pompe à chaleur

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EP (1) EP4545794A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5194538U (fr) * 1975-01-29 1976-07-29
US20160201530A1 (en) * 2015-01-09 2016-07-14 Flexible Metal Inc. Split path silencer
CN111853966A (zh) * 2019-04-30 2020-10-30 青岛海尔智能技术研发有限公司 一种降噪装置及室外机
US20220120469A1 (en) * 2020-10-19 2022-04-21 Volvo Truck Corporation Acoustic resonator for fan
DE202022105887U1 (de) 2021-11-08 2022-12-16 Ariston S.P.A. Schalldämmungssystem eines Unterbringungsgehäuses für den Kühlkreis einer Wärmepumpe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5194538U (fr) * 1975-01-29 1976-07-29
US20160201530A1 (en) * 2015-01-09 2016-07-14 Flexible Metal Inc. Split path silencer
CN111853966A (zh) * 2019-04-30 2020-10-30 青岛海尔智能技术研发有限公司 一种降噪装置及室外机
US20220120469A1 (en) * 2020-10-19 2022-04-21 Volvo Truck Corporation Acoustic resonator for fan
DE202022105887U1 (de) 2021-11-08 2022-12-16 Ariston S.P.A. Schalldämmungssystem eines Unterbringungsgehäuses für den Kühlkreis einer Wärmepumpe

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