EP4375573A1 - Schalldämpfer - Google Patents

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Publication number
EP4375573A1
EP4375573A1 EP22209227.2A EP22209227A EP4375573A1 EP 4375573 A1 EP4375573 A1 EP 4375573A1 EP 22209227 A EP22209227 A EP 22209227A EP 4375573 A1 EP4375573 A1 EP 4375573A1
Authority
EP
European Patent Office
Prior art keywords
pipe segment
section
internal dimension
silencer
internal
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
EP22209227.2A
Other languages
English (en)
French (fr)
Inventor
Gao ChunQing
Rao Lihong
Sybrandus Bernardus Vincentius Munsterhuis
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.)
Ademco Inc
Original Assignee
Ademco Inc
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 Ademco Inc filed Critical Ademco Inc
Priority to EP22209227.2A priority Critical patent/EP4375573A1/de
Publication of EP4375573A1 publication Critical patent/EP4375573A1/de
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
    • F23J2900/13003—Means for reducing the noise in smoke conducing ducts or systems

Definitions

  • the present invention generally relates to a silencer for reducing airflow noise, and in particular a silencer used to reduce airflow noise in a gas boiler.
  • Domestic gas boilers including non-condensing gas boilers and more energy efficient condensing gas boilers, rely on the process of combustion to heat water so as to provide central heating and hot water for homes.
  • fuel e.g., natural gas
  • fuel is burned to produce hot gases which subsequently pass through a heat exchanger where much of their heat is transferred to water, thus raising the water's temperature.
  • fuel is often premixed with air to form a gas/air mixture which is then fed into a burner for combustion.
  • Surrounding air is normally sucked into a fuel mixer of the boiler by a fan. Airflow noise is produced when air enters into the fuel mixer via an air pipe and flows therein.
  • Such airflow noise corresponds to acoustic waves in the frequency range of e.g., 500 hertz (Hz) to 2000 Hz and the noise volume can be perceived as disturbingly loud in particular due to acoustic resonances formed in the air pipe in combination with resonances generated in other parts of the system, such as for example the mixer, burner and fan.
  • the perceived noise level depends on many factors, such as the dimensions of each of the parts or components of the system in which airflow noise is produced, the flow rate of the air or gas/air mixture within each of those parts or components of the system, etc., and as such it can vary from system to system or from configuration to configuration.
  • Existing industrial silencers that are suitable for reducing airflow noise in gas boilers obtain acoustic attenuation through acoustic absorption and/or acoustic scattering.
  • Absorptive silencers use fibrous and porous materials (e.g., cotton) to absorb sound waves so as to dampen the noise volume. The sound energy is at least partially transformed into heat energy which is then dispersed throughout the atmosphere.
  • scattering silencers also known as reactive silencers
  • comprise multiple chambers and perforated structures e.g., perforated tubes, or perforated plates).
  • a silencer for reducing airflow noise comprising: a first pipe segment having a first section with a first internal dimension and a second section with a second internal dimension, wherein the first internal dimension is larger than the second internal dimension; a second pipe segment having a first section with a third internal dimension and a second section with a fourth internal dimension, wherein the third internal dimension is larger than the fourth internal dimension; wherein the first internal dimension and the third internal dimension are configured such that one of the first section of the first pipe segment and the first section of the second pipe segment tightly fits into the other one of the first section of the first pipe segment and the first section of the second pipe segment; wherein the first section of the first pipe segment is configured to connect to the first section of the second pipe segment to form a sealed air passage; and wherein the first section of the first pipe segment and the first section of the second pipe segment are arranged such that the internal space of the first section of the first pipe segment and the first section of the second pipe segment has a substantially uniform internal dimension
  • a kit for assembling into one or more silencers according to the first aspect comprising: a plurality of the first pipe segment with one or more different dimensions; and a plurality of the second pipe segment with one or more different dimensions.
  • a gas boiler comprising: a venturi mixer for mixing fuel and air; and a silencer according to the first aspect for reducing airflow noise in the venturi mixer.
  • Figures 1A, 1B and 2 are associated with embodiments of the silencer SIL, which may comprise a first pipe segment P1 and a second pipe segment P2.
  • the first pipe segment P1 may comprise a first section P1-S1 with a first internal dimension D1 and a second section P1-S2 with a second internal dimension D2.
  • the first internal dimension D1 of the first section P1-S1 of the first pipe segment P1 is larger than the second internal dimension D2 of the second section P1-S2 of the first pipe segment P1.
  • the second pipe segment P2 may comprise a first section P2-S1 with a third internal dimension D3 and a second section P2-S2 with a fourth internal dimension D4.
  • the third internal dimension D3 is larger than the fourth internal dimension D4.
  • the first internal dimension D1 and the third internal dimension D3 are configured such that one of the first section P1-S1 of the first pipe segment P1 and the first section P2-S1 of the second pipe segment tightly fits into the other of the first section P1-S1 of the first pipe segment P1 and the first section P2-S1 of the second pipe segment.
  • the type of the internal dimension may depend on the internal cross-section of the first pipe segment P1 and the second pipe segment P2.
  • the internal dimension may correspond to the internal diameter of the pipe segments.
  • the internal cross-section of the first pipe segment P1 and the second pipe segment P2 is non-circular (e.g., elliptical or polygonal such as square or rectangular)
  • the internal dimension may correspond to the biggest distance between the opposing points of the cross section, or as the case may be, an average distance between the opposing points of the cross-section.
  • the internal dimension of a square or rectangular cross-section may correspond to the diagonal of the cross-section.
  • the internal dimension of an elliptical cross-section may correspond to the average of the diameter along the major axis and the diameter along the minor axis of the cross-section.
  • the first pipe segment P1 and the second pipe segment P2 of the silencer SIL may each comprise a substantially circular cross-section.
  • the first internal dimension D1, the second internal dimension D2, the third internal dimension D3 and the fourth internal dimension D4 may correspond respectively a first internal diameter D1, a second internal diameter D2, a third internal diameter D3 and a fourth internal diameter D4.
  • the fourth internal diameter D4 may be equal to the second internal diameter D2.
  • the fourth internal diameter D4 may be different from the second internal diameter D2. Allowing the possibility to select components with the internal diameters D2 and D4 being different from each other improves the installation flexibility of the silencer SIL.
  • the silencer SIL may be connected to an air pipe at each end of the silencer, i.e. a first pipe (not shown) may connect to the second section P1-S2 of the first pipe segment P1 and a second pipe (not shown) may connect to the second section P2-S2 of the second pipe segment P2, respectively.
  • the first pipe P1 and the second pipe P2 may be provided with different internal diameters.
  • the second internal diameter D2 and the fourth internal diameter D4 of the silencer SIL may therefore be arranged to match the internal diameters of the first and the second air pipe, respectively.
  • the difference between the second internal diameter D2 and the fourth internal diameter D4 may be chosen based on the difference between the diameters of the first pipe and the second pipe, respectively. This difference may be for example at least 10%, at least 20%, at least 40%, at least 50%, at least 60%, or at least 80%.
  • the first internal diameter D1 may be for example between 20 millimetre (mm) and 100 mm, between 20 mm and 90 mm, between 20 mm and 80 mm, between 30 mm and 70 mm, between 30 mm and 60 mm, between 40 mm and 60 mm, or between 40 mm and 50 mm.
  • the second internal diameter D2 may be for example between 10 mm and 80 mm, between 10 mm and 60 mm, between 20 mm and 50 mm, between 20 mm and 40 mm, or between 20 mm and 30 mm.
  • the third internal diameter D3 may be for example between 20 millimetre (mm) and 100 mm, between 20 mm and 90 mm, between 20 mm and 80 mm, between 30 mm and 70 mm, between 30 mm and 60 mm, between 40 mm and 60 mm, or between 40 mm and 50 mm.
  • the fourth internal diameter D4 may be for example between 10 mm and 80 mm, between 10 mm and 60 mm, between 20 mm and 50 mm, between 20 mm and 40 mm, or between 20 mm and 30 mm.
  • the first section P1-S1 of the first pipe segment P1 may be configured to connect to the first section P1-S2 of the second pipe segment P2 to form a sealed air passage (not shown).
  • the first section P1-S1 of the first pipe segment P1 is connected to the first section P1-S2 of the second pipe segment P2
  • the first section P1-S1 of the first pipe segment P1 and the first section P1-S2 of the second pipe segment P2 may be arranged such that the internal space formed by the first section P1-S1 of the first pipe segment P1 and the first section P1-S2 of the second pipe segment P2 has a substantially uniform internal dimension (e.g., D1 and D3 are substantially equal to each other) and is free from any components obstructing airflow.
  • the second pipe segment P2 may comprise a first section P2-S1, which has an internal dimension D3 chosen such that the first pipe segment P1 tightly fits into or around the first section P2-S1 of the second pipe segment P2 and the segments P1, P2 can be assembled and held together by friction between the corresponding portions of the pipe segments P1, P2.
  • the first pipe segment P1 and/or the second pipe segment P2 may comprise additional features (not shown) (e.g., a snap-fit connection interface, a clamp, a clip, etc.) allowing the first and second pipe segments P1, P2 to be assembled together.
  • the full length L of the silencer SIL may be chosen based on various considerations (further discussed below).
  • the length L may be for example between 20 mm and 100 mm, between 20 mm and 80 mm, between 20 mm and 60 mm, between 20 mm and 40 mm, or between 20 mm and 30 mm.
  • the length L1 of the first pipe segment P1 may be equal to the length L2 of the second pipe segment P2.
  • the length L1 of the first pipe segment P1 may be different from the length L2 of the second pipe segment P2.
  • the length L1 or L2 may be for example between 10 mm and 50 mm, between 10 mm and 40 mm, between 10 mm and 30 mm, between 10 mm and 20 mm, or between 10 mm and 15 mm.
  • the dimensions of the silencer SIL may be determined based on the effectiveness of noise reduction or acoustic attenuation.
  • the dimensions of the silencer SIL may be directly associated with the acoustic resonances of the acoustic waves excited by the air flow travelling through the sealed internal air passage of the silencer SIL. Therefore, if the frequency range of the acoustic noise (e.g., airflow noise) is known (e.g., through measurement), the dimensions of the silencer SIL may be determined such that the attenuation of the acoustic noise is increased, maximised or even eliminated.
  • the silencer SIL may be designed in such a way that the first internal diameter D1 is between 40 mm and 50 mm, the second internal diameter D2 is between 20 mm and 30 mm, the third internal diameter D3 is between 40 mm and 50 mm, the fourth internal diameter D4 is between 20 mm and 30 mm, and the full length of the silencer SIL is between 20 mm and 30 mm with the first pipe segment P1 and the second pipe segment P2 having an equal length.
  • the internal space or the hollow chamber of the assembled silencer SIL which is formed by the first section P1-S1 of the first pipe segment P1 and the first section P1-S2 of the second pipe segment P2, has a substantially uniform internal diameter equal to the first internal diameter D1.
  • Such a silencer may be able to provide a sufficient noise attenuation so as to substantially suppress the airflow noise.
  • the silencer SIL may be made of plastic (e.g., nylon, polythene).
  • the silencer SIL may be manufactured by moulding (e.g., injection moulding).
  • a silencer kit may be provided for assembling into one or more silencers SIL.
  • the silencer kit may comprise a plurality of the first pipe segments (P1) with one or more different dimensions (e.g., the same first internal diameters (D1) but different second internal diameters (D2)); and a plurality of the second pipe segment (P2) with one or more different dimensions (e.g., the same third internal diameters (D3) but different fourth internal diameters (D4)).
  • a user may select a desired pair of the first pipe segment (P1) and the second pipe segment (P2) from the silencer kit according to the sizes of the existing air pipes to which the silencer (SIL) is to be connected. Then, the user may assemble the two selected pipe segments (P1 and P2) into a silencer (SIL). Finally, the user may connect the assembled silencer (SIL) to the air pipes to reduce airflow noise.
  • a user may select a desired pair of the first pipe segment (P1) and the second pipe segment (P2) from the silencer kit according to the noise frequencies to be attenuated. Then, the user may assemble the two selected pipe segments (P1 and P2) into a silencer (SIL). Finally, the user may connect the assembled silencer (SIL) to the air pipes (the sizes of which are adaptable to the silencer (SIL)) to reduce airflow noise.
  • SIL silencer
  • the example gas boiler is a wall-hung condensed gas boiler commonly used in homes.
  • the example gas boiler comprises a venturi mixer VEN where fuel GS (e.g., natural gas) and air AR are premixed to form a gas/air mixture MG, a premix gas blower PGB which directs the gas/air mixture MG from the venturi mixer VEN to a burning unit BU where combustion of the gas/air mixture MG takes place, and a heat exchanging unit HEX where heat generated from the combustion is transferred to water.
  • fuel GS e.g., natural gas
  • PGB premix gas blower
  • the venturi mixer VEN comprises a short air pipe AP through which ambient air is sucked (by the premix gas blower PGB) into the venturi mixer VEN, and a short gas pipe GP through which fuel (e.g., natural gas) is fed into the venturi mixer VEN.
  • fuel e.g., natural gas
  • High volume airflow noise is produced while the air flows through the air pipe AP and an internal channel of the venturi mixer VEN.
  • the inventors have found that the airflow noise which covers the acoustic frequency range between 500 Hz and 2000 Hz can be effectively dampened or attenuated if the proposed silencer (e.g., as shown in Figure 1A and Figure 1B ) is connected to the air pipe AP of the venturi mixer VEN.
  • the silencer SIL e.g., the second section P2-S2 of the second pipe segment P2
  • the silencer SIL may be connected to the air pipe AP of the venturi mixer VEN of the gas boiler.
  • the other end of the silencer SIL e.g., the second section P1-S2 of the first pipe segment P1 may be connected to another air pipe (not shown).
  • the internal diameters of the second sections P1-S2 or P2-S2 of the first pipe segment P1 and the second pipe segment P2 can be chosen in accordance with the diameters of the air pipes of the gas boiler.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP22209227.2A 2022-11-23 2022-11-23 Schalldämpfer Pending EP4375573A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22209227.2A EP4375573A1 (de) 2022-11-23 2022-11-23 Schalldämpfer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22209227.2A EP4375573A1 (de) 2022-11-23 2022-11-23 Schalldämpfer

Publications (1)

Publication Number Publication Date
EP4375573A1 true EP4375573A1 (de) 2024-05-29

Family

ID=84689296

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22209227.2A Pending EP4375573A1 (de) 2022-11-23 2022-11-23 Schalldämpfer

Country Status (1)

Country Link
EP (1) EP4375573A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168948A (en) * 1976-04-08 1979-09-25 Kabushiki Kaisha Tomoe Shokai Burner assembly
DE19519073A1 (de) * 1994-05-24 1995-11-30 Sem Schneider Elementebau Gmbh Vorrichtung zur Verbindung von Rohrleitungsabschnitten untereinander
EP2138767A2 (de) * 2008-06-25 2009-12-30 Baxi S.p.a. Kompakter Schalldämpfer für einen Kondensationsboiler

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168948A (en) * 1976-04-08 1979-09-25 Kabushiki Kaisha Tomoe Shokai Burner assembly
DE19519073A1 (de) * 1994-05-24 1995-11-30 Sem Schneider Elementebau Gmbh Vorrichtung zur Verbindung von Rohrleitungsabschnitten untereinander
EP2138767A2 (de) * 2008-06-25 2009-12-30 Baxi S.p.a. Kompakter Schalldämpfer für einen Kondensationsboiler

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