Resonator arrangement for the cabinet of a refrigeration appliance

Abstract

The invention refers to a resonator arrangement for the cabinet of a refrigeration appliance, said cabinet defining a housing and carrying, in the latter, a compressor presenting a hermetic casing and a defrost water evaporating tray comprising: a bottom wall, to be seated onto an upper portion of the casing of the compressor; and a peripheral wall superiorly projecting from the bottom wall, at least one of the peripheral wall and bottom wall of the evaporating tray carrying a noise absorbing means turned to a noise generation region in said housing and being dimensioned to define a certain reactive impedance and a certain dissipative impedance in the medium of the housing for a determined frequency band.

1 . A resonator arrangement for the cabinet of a refrigeration appliance, said cabinet defining a housing and carrying, in the latter, a compressor presenting a hermetic casing and a defrost water evaporating tray, comprising:
 a bottom wall to be seated onto an upper portion of the casing of the compressor; and   a peripheral wall superiorly projecting from the bottom wall, wherein at least one of the peripheral wall and bottom wall of the evaporating tray carries a noise absorbing element turned to a noise generation region in said housing and being dimensioned to define a certain reactive impedance and a certain dissipative impedance in the medium of the housing, for a determined frequency band.   
   
   
       2 . The arrangement, as set forth in  claim 1 , wherein the noise absorbing element comprises at least one resonator conduct extending along an extension of the respective wall of the evaporating tray. 
   
   
       3 . The arrangement, as set forth in  claim 2 , wherein each resonator conduct presents a first end, which is open and turned to the noise generation region in said housing, and a second end, which is opposite and spaced from the first end, each resonator conduct being dimensioned to present a determined length and a determined diameter, which are calculated to define a certain reactive impedance and a certain dissipative impedance in the medium of the housing, for a determined frequency band. 
   
   
       4 . The arrangement, as set forth in  claim 3 , wherein at least one resonator conduct is at least partially formed in a single piece with an adjacent surface portion of the respective wall of the evaporating tray. 
   
   
       5 . The arrangement, as set forth in  claim 4 , wherein at least part of the length of each resonator conduct is formed in the thickness of the respective wall of the evaporating tray. 
   
   
       6 . The arrangement, as set forth in  claim 5 , wherein the evaporating tray carries a tubular sleeve, the cross-section of the resonator conducts being partially defined in each of the parts of evaporating tray and tubular sleeve. 
   
   
       7 . The arrangement, as set forth in  claim 6 , wherein the tubular sleeve presents a surface confronting with an adjacent wall surface of the evaporating tray, each resonator conduct being defined by a recess produced in at least one confronting surface of tubular sleeve and adjacent wall of the evaporating tray. 
   
   
       8 . The arrangement, as set forth in  claim 7 , wherein the tubular sleeve occupies one of the inner and outer positions in relation to the peripheral wall of the evaporating tray. 
   
   
       9 . The arrangement, as set forth in  claim 8 , wherein at least one of the parts of peripheral wall and bottom wall of the evaporating tray, of tubular sleeve and at least one resonator conduct is defined in a porous or fibrous material. 
   
   
       10 . The arrangement, as set forth in  claim 8 , wherein at least one of the parts of peripheral wall and bottom wall of the evaporating tray, of tubular sleeve and at least one resonator conduct is coated with a porous or fibrous material. 
   
   
       11 . The arrangement, as set forth in any one of  claim 9 , wherein the porous material is defined by a material selected from polystyrene polymer, polypropylene and metallic material. 
   
   
       12 . The arrangement, as set forth in  claim 11 , wherein the porous material presents a plurality of closed pores. 
   
   
       13 . The arrangement, as set forth in any one of  claim 9 , wherein the porous material is defined by a material selected from polystyrene polymer and polypropylene, said porous material presenting a plurality of pores, at least part of the pores being open. 
   
   
       14 . The arrangement, as set forth in  claim 3 , wherein the evaporating tray carries a peripheral ring provided with a plurality of resonator conducts. 
   
   
       15 . The arrangement, as set forth in  claim 14 , wherein the peripheral ring has a thickness, at least part of the resonator conducts being formed in the wall thickness of the peripheral ring. 
   
   
       16 . The arrangement, as set forth in  claim 14 , wherein the peripheral ring occupies one of the inner and outer positions in relation to the peripheral wall of the evaporating tray. 
   
   
       17 . The arrangement, as set forth in  claim 16 , wherein at least one of the parts of peripheral wall and bottom wall of the evaporating tray, of peripheral ring and at least one resonator conduct is defined in a porous or fibrous material. 
   
   
       18 . The arrangement, as set forth in  claim 16 , wherein at least one of the parts of peripheral wall and bottom wall of the evaporating tray, of peripheral ring and at least one resonator conduct is coated with a porous or fibrous material. 
   
   
       19 . The arrangement, as set forth in  claim 17 , wherein the porous material is defined by a material selected from polystyrene polymer, polypropylene and metallic material. 
   
   
       20 . The arrangement, as set forth in  claim 19 , wherein the porous material presents a plurality of closed pores. 
   
   
       21 . The arrangement, as set forth in  claim 17 , wherein the porous material is defined by a material selected from polystyrene polymer and polypropylene, having at least part of the pores open. 
   
   
       22 . The arrangement, as set forth in  claim 3 , wherein the resonator conducts are straight in at least part of their extension. 
   
   
       23 . The arrangement, as set forth in  claim 22 , wherein at least two resonator conducts are parallel to one another. 
   
   
       24 . The arrangement, as set forth in  claim 22 , wherein at least one of the resonator conducts is vertical. 
   
   
       25 . The arrangement, as set forth in  claim 22 , wherein at least one of the resonator conducts is horizontal. 
   
   
       26 . The arrangement, as set forth in  claim 22 , wherein the resonator conducts are provided inclined in relation to the axis of the wall in which they are provides. 
   
   
       27 . The arrangement, as set forth in  claim 3 , wherein the second end of each resonator conduct is closed. 
   
   
       28 . The arrangement, as set forth in  claim 3 , wherein at least part of the resonator conducts presents a constant cross-section along their length. 
   
   
       29 . The arrangement, as set forth in  claim 3 , wherein at least part of the resonator conducts presents a variable cross-section along their length. 
   
   
       30 . The arrangement, as set forth in  claim 29 , wherein at least part of the resonator conducts presents a stepped cross-section. 
   
   
       31 . The arrangement, as set forth in  claim 29 , wherein at least part of the resonator conducts presents a conical cross-section. 
   
   
       32 . The arrangement, as set forth in  claim 29 , wherein at least part of the resonator conducts presents an exponential cross-section. 
   
   
       33 . The arrangement, as set forth in  claim 28 , wherein at least part of the resonator conducts has one of the circular and polygonal cross-sections. 
   
   
       34 . The arrangement, as set forth in  claim 1 , wherein the noise absorbing element presents a plurality of pores. 
   
   
       35 . The arrangement, as set forth in  claim 34 , wherein each pore presents a first end portion, which is open and turned to the noise generation region in said housing, and a second end portion, which is opposite and spaced from the first end, each pore being dimensioned to present a determined inner section calculated to define a certain reactive impedance and a certain dissipative impedance in the medium of the housing for a determined frequency band. 
   
   
       36 . The arrangement, as set forth in  claim 34 , wherein at least one of the peripheral wall and bottom wall of the evaporating tray is defined in a porous or fibrous material. 
   
   
       37 . The arrangement, as set forth in  claim 34 , wherein at least one of the peripheral wall and bottom wall of the evaporating tray is coated with a porous or fibrous material. 
   
   
       38 . The arrangement, as set forth in  claim 36 , wherein the porous material is defined by a material selected from polystyrene polymer, polypropylene and metallic material. 
   
   
       39 . The arrangement, as set forth in  claim 38 , wherein the pores are closed. 
   
   
       40 . The arrangement, as set forth in  claim 36 , wherein the porous material is defined by a material selected from polystyrene polymer and polypropylene, having at least part of the pores open. 
   
   
       41 . The arrangement, as set forth in  claim 1 , wherein the noise absorbing element comprises at least one resonator conduct extending along an extension of the respective wall of the evaporating tray and presenting a plurality of pores. 
   
   
       42 . The arrangement, as set forth in  claim 41 , wherein each resonator conduct presents a first end, which is open and turned to the noise generation region in said housing, and a second end, which is opposite and spaced from the first end, each resonator conduct being dimensioned to present a determined length and a determined diameter, which are calculated to define a certain reactive impedance and a certain dissipative impedance in the medium of the housing, for a determined frequency band. 
   
   
       43 . The arrangement, as set forth in  claim 41 , wherein at least one of the parts of peripheral wall and bottom wall of the evaporating tray and at least one resonator conduct is defined in a porous or fibrous material. 
   
   
       44 . The arrangement, as set forth in  claim 41 , wherein at least one of the parts of peripheral wall and bottom wall of the evaporating tray and at least one resonator conduct is coated with a porous or fibrous material. 
   
   
       45 . The arrangement, as set forth in  claim 42 , wherein the porous material is defined by a material selected from polystyrene polymer, polypropylene and metallic material. 
   
   
       46 . The arrangement, as set forth in  claim 44 , wherein the porous material presents a plurality of closed pores. 
   
   
       47 . The arrangement, as set forth in  claim 42 , wherein the porous material is defined by a material selected from polystyrene polymer and polypropylene, having at least part of the pores open.