EP1877664A1 - Suction muffler for a refrigeration compressor - Google Patents

Suction muffler for a refrigeration compressor

Info

Publication number
EP1877664A1
EP1877664A1 EP06721643A EP06721643A EP1877664A1 EP 1877664 A1 EP1877664 A1 EP 1877664A1 EP 06721643 A EP06721643 A EP 06721643A EP 06721643 A EP06721643 A EP 06721643A EP 1877664 A1 EP1877664 A1 EP 1877664A1
Authority
EP
European Patent Office
Prior art keywords
duct
gas
suction muffler
opening
closed end
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.)
Withdrawn
Application number
EP06721643A
Other languages
German (de)
French (fr)
Inventor
Eduardo De Souza Alvarenga
Rodrigo Link
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.)
Whirlpool SA
Original Assignee
Whirlpool SA
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 Whirlpool SA filed Critical Whirlpool SA
Publication of EP1877664A1 publication Critical patent/EP1877664A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
    • F04B39/0061—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes using muffler volumes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
    • F04B39/0066—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes using sidebranch resonators, e.g. Helmholtz resonators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0033—Pulsation and noise damping means with encapsulations
    • F04B39/0038—Pulsation and noise damping means with encapsulations of inlet or outlet channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/10—Adaptations or arrangements of distribution members
    • F04B39/1066—Valve plates
    • 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
    • F25B31/00—Compressor arrangements
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F25D17/08—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation using ducts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00—Working fluid
    • F05B2210/10—Kind or type
    • F05B2210/12—Kind or type gaseous, i.e. compressible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/96—Preventing, counteracting or reducing vibration or noise
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S181/00—Acoustics
    • Y10S181/403—Refrigerator compresssor muffler

Definitions

  • the present invention refers to a suction muffler for a refrigeration compressor, particularly of the type used in small refrigeration systems, such as refrigerators, freezers, water fountains, refrigerated counters, and which is provided in the region where the refrigerant gas is admitted to the hermetic compressor.
  • compressors of the refrigeration systems present, at the suction side thereof, an acoustic dampening system or suction muffler provided inside the shell and which conducts the gas coming from the suction line of said refrigeration systems to a suction valve that is conventionally disposed to provide the selective and automatic opening of a respective suction orifice of a valve plate in which the suction and discharge valves of the compressor are usually mounted.
  • the suction muffler has, several important functions to the adequate operation of the compressor, such as: to direct the gas, to attenuate the noise resulting from pulsation provoked by suction, to thermally insulate the gas being drawn into the cylinder, and to control the dynamics of the suction valve.
  • the present refrigeration compressors use the suction muffler of the volume-tube type.
  • This type of suction muffler usually consists of a sequence of volumes interconnected by tubes which conduct the gas coming from the suction line directly to the suction valve. At present, said tubes presenting open ends for the passage of refrigerant gas.
  • Gas displacement produces pulses, generating noises that are propagated in a direction that is opposite to the gas flow toward the suction valve.
  • the influence of the suction muffler on the performance of the compressor is highly important and the dimensioning of both the inner volumes and the length of the tubes of the suction muffler determine, to a great extent, the efficiency of the compressor.
  • the known suction mufflers of the volume-tube type have the disadvantage of presenting noise peaks in the specific operational modes of said tubes .
  • a suction muffler for a refrigeration compressor mounted within a shell
  • said suction muffler comprising a hollow body defining at least one dampening chamber that carries a gas inlet duct having an inlet opening external to the dampening chamber and an outlet opening in the interior of the dampening chamber, and a gas outlet duct presenting an inlet opening in the interior of the dampening chamber and an outlet opening external to said dampening chamber, at least one of the gas inlet and gas outlet ducts presenting at least one closed end, and one of the inlet and outlet openings being positioned at a certain distance from said closed end, along the respective duct, smaller than the distance of said opening in relation to the other opening of the same duct and in a region of the latter presenting a minimum acoustic pressure for a determined frequency, the dimensioning of said duct and of the cross section of the first of said openings being achieved so as to minimize the gas pulsation noises inside the su
  • the dimensioning of said gas duct and of the cross section of said opening is achieved so as to minimize the gas pulsation noises inside the suction muffler which are generated upon the closing and opening of the suction valve.
  • the region of minimum acoustic pressure is represented as a nodal point of the acoustic mode of the duct.
  • Figure 1 illustrates, schematically and partially, a longitudinal sectional view of a compressor carrying a suction muffler
  • Figure 2 illustrates, schematically, a partial cross- sectional upper plan view of a suction muffler constructed according to the present invention, presenting a dampening chamber carrying a gas inlet duct and a gas outlet duct of the suction muffler;
  • Figure 3 illustrates, schematically, a longitudinal sectional view of a construction for a suction muffler of the present invention, according to line III-III of figure 2, presenting a dampening chamber carrying a gas inlet duct of the suction muffler;
  • Figure 4 illustrates, schematically, another longitudinal sectional view of the suction muffler of the present invention, according to line IV-IV of figure 2, showing the gas outlet duct of the suction muffler;
  • Figure 5 illustrates, schematically, a longitudinal sectional view of another construction for a suction muffler of the present invention, presenting two dampening chambers carrying respective gas inlet and gas outlet ducts of the suction muffler; and
  • Figure 6 illustrates, schematically, a graph showing the attenuation curve obtained, for frequency 2kHz, with a muffler construction of the prior art (full lines) and with the construction of the present invention (broken lines) .
  • a compressor of the type used in refrigeration systems comprising, inside a hermetic shell 1, a motor- compressor assembly having a cylinder block in which is defined a cylinder 2 lodging, at one end, a piston 3, and having an opposite end closed by a cylinder cover 4 defining, therewithin, a suction chamber (not illustrated) and a discharge chamber 5 in selective fluid communication with a compression chamber 6 defined inside the cylinder 2 between a top portion of the piston 3 and a valve plate 7 provided between the opposite end of the cylinder 2 and the cylinder cover 4, through a suction orifice 7a and a discharge orifice 7b, which are respectively closed by suction and discharge valves 8a, 8b.
  • the gas drawn by the compressor and coming from a suction line (not illustrated) of the refrigeration system to which the compressor is coupled reaches the interior of the shell 1 through the suction muffler, generally provided inside said shell 1 and maintained in fluid communication with the interior of the suction chamber of the compressor.
  • the suction muffler of the present invention comprises a hollow body 10, which is generally made of a material of low thermal conductivity, such as plastic, defining at least one dampening chamber 13, for example internal to said hollow body 10 and carrying a gas inlet duct 20 having an inlet opening 21 external to the dampening chamber 13 and an outlet opening 22 in the interior of the dampening chamber 13 and a gas outlet duct 30 presenting an inlet opening 31 in the interior of the dampening chamber 13 and an outlet opening 32 external to said dampening chamber 13.
  • a hollow body 10 which is generally made of a material of low thermal conductivity, such as plastic, defining at least one dampening chamber 13, for example internal to said hollow body 10 and carrying a gas inlet duct 20 having an inlet opening 21 external to the dampening chamber 13 and an outlet opening 22 in the interior of the dampening chamber 13 and a gas outlet duct 30 presenting an inlet opening 31 in the interior of the dampening chamber 13 and an outlet opening 32 external to said dampening chamber 13.
  • At least one of the gas inlet and gas outlet ducts 20, 30 presents at least one closed end 23, 33, one of the inlet and outlet openings 21, 22, 31, 32 being positioned at a certain distance from the closed end 23, 33, along the respective duct 20, 30, smaller than the distance of said opening in relation to the other opening of the same duct 20, 30 and in a region thereof presenting a minimum acoustic pressure for a determined frequency, the dimensioning of said duct 20, 30 and of the cross section of the first of said openings 21, 31; 22, 32, being achieved in such a way as to minimize the gas pulsation noises inside the suction muffler.
  • each closed end 23, 33 is submitted to. the same gas pressure reigning in said region of minimum acoustic pressure.
  • the suction muffler presents a dampening chamber 13 provided with a gas inlet duct 20 having its inlet opening 21 in fluid communication with the gas supply to the compressor, connected to the suction line of the refrigeration system to which the compressor is coupled and its outlet opening 22 in fluid communication with a suction side of the compressor, for example, directly connected to the suction orifice 7a of the valve plate 7 of the compressor.
  • the outlet opening 32 of the gas outlet duct 30 of a first dampening chamber 13 is maintained in fluid communication with the suction orifice 7a through another dampening chamber 14 , as for example illustrated in figure 5, said other dampening chamber 14 having another gas outlet duct 40 having an inlet opening 41 opened to the interior of said other dampening chamber 14 and an outlet opening 42 connected to the suction orifice 7a.
  • the suction muffler comprises a hollow body 10 defining two dampening chamber 13, 14, for example, internal to said hollow body 10 and separated from each other by a common wall 15.
  • each of the gas ducts 20, 30, 40 presents a geometry defined so that at least one of its inlet and outlet openings 21, 22, 31, 32, 41, 42 is positioned at a certain distance from each closed end 23, 33 of the same duct 20, 30, 40, along this duct 20, 30, 40, smaller than the distance of said opening in relation to the other opening of the same duct 20, 30, 40 and in a region thereof presenting a minimum acoustic pressure for a determined frequency, the dimensioning of said duct 20, 30, 40 and of said cross section of the first of said openings 21, 31; 22, 32; 41, 42, being defined so as to minimize the gas pulsation noises in the interior of the suction muffler, the distance between the medium line of the first of said openings 21, 31; 22, 32; 41, 42 and the closed end 23, 33 of the same duct 20, 30, 40, in which is provided said closed end 23, 33, being greater than half the diameter of said opening 21, 31; 22, 32; 41, 42.
  • the hollow body 10 of the suction muffler presents, internally, only one dampening chamber 13, to the interior of the latter projecting the outlet opening 22 of the gas inlet duct 20 and the inlet opening 31 of the gas outlet duct 30.
  • the gas inlet duct 20 has a closed end 23 located closer to the inlet opening 21 of said gas inlet duct 20 and defined in a nodal region of minimum acoustic pressure.
  • the gas outlet duct 30 may or may not have a closed end.
  • Figure 4 illustrates a construction in which the gas outlet duct 30, illustrated in figure 2, has a closed end 33 provided closer to the inlet opening 31 of said gas outlet duct 30.
  • each gas inlet and gas outlet duct 20, 30, 40 may present at least one respective closed end 23, 33 in each dampening chamber 13, 14.
  • the gas inlet duct 30 presents a closed end 33 in the interior of the dampening chamber 13, closer to the inlet opening 31 of said gas inlet duct 30.
  • the closed end may be also provided adjacent to the outlet opening of the same gas duct .
  • the opening defined in the region of minimum acoustic pressure is one of the inlet and outlet openings 21, 22, 31, 32, 41, 42 of each gas inlet and gas outlet duct 20, 30, 40 inside the hollow body 10, in a respective dampening chamber 13, 14.
  • an acoustic mode is determined to have a certain attenuated frequency, said attenuation occurring in the region of the gas duct or ducts 20, 30, 40 having a minimum acoustic node, that is, in the regions with minimum pressure.
  • the pressures reigning in each of the gas ducts 20, 30, 40 of the suction muffler are the stationary or acoustic pressures presenting regions of minimum and maximum pressure. Once the minimum pressure regions are determined, one can determine the region to provide said inlet opening
  • Each gas duct 20, 30, 40 provided with an opening or openings in nodal regions, presents each respective closed end 23, 33 constructed in such a way as to avoid any direct communication of the gas with the interior of the hollow body 10 of said suction muffler.
  • an inner sidewall portion of the hollow body 10 defines a cover portion in which is tightly fitted the closed end 23, 33 of a gas duct 20, 30, 40, said cover portion being retained therein by appropriate retaining means, such as glue, clamps, projections or by interference.
  • each closed end 23, 33 incorporates the respective cover, which is for example defined as a single piece with the remaining of the respective body of the gas duct 20, 30, 40, for example by injection, jointly with the formation of the duct in a single piece, or by over-injection.
  • the gas duct 20, 30, 40 carries and secures a cover closing an adjacent closed end 23, 33.
  • the closed end 23, 33 is defined in a plane intercepted by the direction of the gas flow passing through the opening defined in a nodal region of minimum acoustic pressure of the respective gas duct 20, 30, 40, said opening positioning allowing the pressure to be taken at a point of minimum acoustic pressure, generating high acoustic attenuation in a determined frequency band, as illustrated in figure 6.
  • the closed end 23, 33 is defined in a plane parallel to the direction of the gas flow passing through the first of said openings 21, 31; 22, 32, 42 of one of the first, second and third gas ducts 20, 30, 40, said opening positioning also allowing the pressure to be taken at a point of minimum acoustic pressure, generating high acoustic attenuation in a determined frequency band, as illustrated in figure 6.
  • Specific aspects of the invention are shown in the figures of the drawings for convenience only, as each aspect can be combined with other aspects according to the invention. Other embodiments will be recognized as possible by those skilled in the art and should be included in the scope of the claims. Accordingly, the description above should be construed as illustrative and not as limitative of the scope of protection of the invention. All such obvious modifications and alterations are found in the scope of protection defined in the appended claims.

Abstract

A suction muffler for a refrigeration compressor, comprising a hollow body (10) defining at least one dampening chamber (13, 14) that carries a gas inlet duct (20) and a gas outlet duct (30) presenting an inlet opening (21,31) and an outlet opening (22, 32), for communicating the interior ant the exterior of the dampening chamber (13, 14), at least one of the gas inlet and gas outlet ducts (20, 30) presenting at least one closed end (23, 33), one of the inlet and outlet openings (21, 22, 31, 32) being positioned at a certain distance from said closed end (23, 33), smaller than the distance of said opening in relation to the other opening of the same duct (20, 30) and in a region of the latter presenting a minimum acoustic pressure for a determined frequency, the dimensioning of said duct (20, 30) and of the cross section of the first of said openings (21, 31; 22, 32) being achieved so as to minimize the gas pulsation noises inside the suction muffler.

Description

"SUCTION MUFFLER FOR A REFRIGERATION COMPRESSOR" Field of the Invention
The present invention refers to a suction muffler for a refrigeration compressor, particularly of the type used in small refrigeration systems, such as refrigerators, freezers, water fountains, refrigerated counters, and which is provided in the region where the refrigerant gas is admitted to the hermetic compressor. Background of the Invention
As a rule, compressors of the refrigeration systems present, at the suction side thereof, an acoustic dampening system or suction muffler provided inside the shell and which conducts the gas coming from the suction line of said refrigeration systems to a suction valve that is conventionally disposed to provide the selective and automatic opening of a respective suction orifice of a valve plate in which the suction and discharge valves of the compressor are usually mounted.
The suction muffler has, several important functions to the adequate operation of the compressor, such as: to direct the gas, to attenuate the noise resulting from pulsation provoked by suction, to thermally insulate the gas being drawn into the cylinder, and to control the dynamics of the suction valve.
The present refrigeration compressors use the suction muffler of the volume-tube type. This type of suction muffler usually consists of a sequence of volumes interconnected by tubes which conduct the gas coming from the suction line directly to the suction valve. At present, said tubes presenting open ends for the passage of refrigerant gas.
Gas displacement produces pulses, generating noises that are propagated in a direction that is opposite to the gas flow toward the suction valve. The more efficient the suction muffler at its acoustic outlet through which the gas is admitted into the muffler, the lower said pulses. The influence of the suction muffler on the performance of the compressor is highly important and the dimensioning of both the inner volumes and the length of the tubes of the suction muffler determine, to a great extent, the efficiency of the compressor. While widely used, the known suction mufflers of the volume-tube type have the disadvantage of presenting noise peaks in the specific operational modes of said tubes . Objects of the Invention It is an object of the present invention to provide a suction muffler for a reciprocating hermetic compressor, which does not present the inconveniences of the known prior art solutions, producing a better noise attenuation of the pulses resulting from gas being drawn to the suction valve.
It is a more specific object of the present invention to provide a suction muffler as cited above, which allows optimizing the acoustic attenuation for specific frequency bands . Summary of the Invention
These and other objects of the present invention are achieved by the provision of a suction muffler for a refrigeration compressor mounted within a shell, said suction muffler comprising a hollow body defining at least one dampening chamber that carries a gas inlet duct having an inlet opening external to the dampening chamber and an outlet opening in the interior of the dampening chamber, and a gas outlet duct presenting an inlet opening in the interior of the dampening chamber and an outlet opening external to said dampening chamber, at least one of the gas inlet and gas outlet ducts presenting at least one closed end, and one of the inlet and outlet openings being positioned at a certain distance from said closed end, along the respective duct, smaller than the distance of said opening in relation to the other opening of the same duct and in a region of the latter presenting a minimum acoustic pressure for a determined frequency, the dimensioning of said duct and of the cross section of the first of said openings being achieved so as to minimize the gas pulsation noises inside the suction muffler.
The dimensioning of said gas duct and of the cross section of said opening is achieved so as to minimize the gas pulsation noises inside the suction muffler which are generated upon the closing and opening of the suction valve. The region of minimum acoustic pressure is represented as a nodal point of the acoustic mode of the duct. Brief Description of the Drawings
The invention will be described below based on the appended drawings, given by way of example of one embodiment of the invention and in which: Figure 1 illustrates, schematically and partially, a longitudinal sectional view of a compressor carrying a suction muffler;
Figure 2 illustrates, schematically, a partial cross- sectional upper plan view of a suction muffler constructed according to the present invention, presenting a dampening chamber carrying a gas inlet duct and a gas outlet duct of the suction muffler; Figure 3 illustrates, schematically, a longitudinal sectional view of a construction for a suction muffler of the present invention, according to line III-III of figure 2, presenting a dampening chamber carrying a gas inlet duct of the suction muffler;
Figure 4 illustrates, schematically, another longitudinal sectional view of the suction muffler of the present invention, according to line IV-IV of figure 2, showing the gas outlet duct of the suction muffler;
Figure 5 illustrates, schematically, a longitudinal sectional view of another construction for a suction muffler of the present invention, presenting two dampening chambers carrying respective gas inlet and gas outlet ducts of the suction muffler; and Figure 6 illustrates, schematically, a graph showing the attenuation curve obtained, for frequency 2kHz, with a muffler construction of the prior art (full lines) and with the construction of the present invention (broken lines) .
Description of the Illustrated Embodiments The present invention will be described for a compressor of the type used in refrigeration systems and comprising, inside a hermetic shell 1, a motor- compressor assembly having a cylinder block in which is defined a cylinder 2 lodging, at one end, a piston 3, and having an opposite end closed by a cylinder cover 4 defining, therewithin, a suction chamber (not illustrated) and a discharge chamber 5 in selective fluid communication with a compression chamber 6 defined inside the cylinder 2 between a top portion of the piston 3 and a valve plate 7 provided between the opposite end of the cylinder 2 and the cylinder cover 4, through a suction orifice 7a and a discharge orifice 7b, which are respectively closed by suction and discharge valves 8a, 8b.
According to the illustrations, the gas drawn by the compressor and coming from a suction line (not illustrated) of the refrigeration system to which the compressor is coupled, reaches the interior of the shell 1 through the suction muffler, generally provided inside said shell 1 and maintained in fluid communication with the interior of the suction chamber of the compressor.
As illustrated in the enclosed drawings, the suction muffler of the present invention comprises a hollow body 10, which is generally made of a material of low thermal conductivity, such as plastic, defining at least one dampening chamber 13, for example internal to said hollow body 10 and carrying a gas inlet duct 20 having an inlet opening 21 external to the dampening chamber 13 and an outlet opening 22 in the interior of the dampening chamber 13 and a gas outlet duct 30 presenting an inlet opening 31 in the interior of the dampening chamber 13 and an outlet opening 32 external to said dampening chamber 13.
According to the present invention, at least one of the gas inlet and gas outlet ducts 20, 30 presents at least one closed end 23, 33, one of the inlet and outlet openings 21, 22, 31, 32 being positioned at a certain distance from the closed end 23, 33, along the respective duct 20, 30, smaller than the distance of said opening in relation to the other opening of the same duct 20, 30 and in a region thereof presenting a minimum acoustic pressure for a determined frequency, the dimensioning of said duct 20, 30 and of the cross section of the first of said openings 21, 31; 22, 32, being achieved in such a way as to minimize the gas pulsation noises inside the suction muffler.
According to the present invention, each closed end 23, 33, is submitted to. the same gas pressure reigning in said region of minimum acoustic pressure. In the construction illustrated in figures 2 and 3, the suction muffler presents a dampening chamber 13 provided with a gas inlet duct 20 having its inlet opening 21 in fluid communication with the gas supply to the compressor, connected to the suction line of the refrigeration system to which the compressor is coupled and its outlet opening 22 in fluid communication with a suction side of the compressor, for example, directly connected to the suction orifice 7a of the valve plate 7 of the compressor. According to a constructive option of the present invention, the outlet opening 32 of the gas outlet duct 30 of a first dampening chamber 13 is maintained in fluid communication with the suction orifice 7a through another dampening chamber 14 , as for example illustrated in figure 5, said other dampening chamber 14 having another gas outlet duct 40 having an inlet opening 41 opened to the interior of said other dampening chamber 14 and an outlet opening 42 connected to the suction orifice 7a. In the construction illustrated in figure 5, the suction muffler comprises a hollow body 10 defining two dampening chamber 13, 14, for example, internal to said hollow body 10 and separated from each other by a common wall 15. To the interior of a first of said dampening chambers 13 projects the outlet opening 22 of the gas inlet duct 20, and an inlet opening 31 of a gas outlet duct 30 • has its outlet opening 32 projecting to the interior of the other dampening chamber 14, providing fluid communication between said dampening chambers 13, 14. In this construction, to the interior of the other dampening chamber 14 also projects the inlet opening 41 of another gas outlet duct 40 having an outlet opening 42 to be connected to the suction orifice 7a in the valve plate 7. According to the present invention, each of the gas ducts 20, 30, 40 presents a geometry defined so that at least one of its inlet and outlet openings 21, 22, 31, 32, 41, 42 is positioned at a certain distance from each closed end 23, 33 of the same duct 20, 30, 40, along this duct 20, 30, 40, smaller than the distance of said opening in relation to the other opening of the same duct 20, 30, 40 and in a region thereof presenting a minimum acoustic pressure for a determined frequency, the dimensioning of said duct 20, 30, 40 and of said cross section of the first of said openings 21, 31; 22, 32; 41, 42, being defined so as to minimize the gas pulsation noises in the interior of the suction muffler, the distance between the medium line of the first of said openings 21, 31; 22, 32; 41, 42 and the closed end 23, 33 of the same duct 20, 30, 40, in which is provided said closed end 23, 33, being greater than half the diameter of said opening 21, 31; 22, 32; 41, 42. In a constructive option illustrated in figures 2, 3 and 4, the hollow body 10 of the suction muffler presents, internally, only one dampening chamber 13, to the interior of the latter projecting the outlet opening 22 of the gas inlet duct 20 and the inlet opening 31 of the gas outlet duct 30. However, in this construction, the gas inlet duct 20 has a closed end 23 located closer to the inlet opening 21 of said gas inlet duct 20 and defined in a nodal region of minimum acoustic pressure. In this construction, the gas outlet duct 30 may or may not have a closed end. Figure 4 illustrates a construction in which the gas outlet duct 30, illustrated in figure 2, has a closed end 33 provided closer to the inlet opening 31 of said gas outlet duct 30. According to the present invention, each gas inlet and gas outlet duct 20, 30, 40 may present at least one respective closed end 23, 33 in each dampening chamber 13, 14.
In the construction illustrated in figure 5, the gas inlet duct 30 presents a closed end 33 in the interior of the dampening chamber 13, closer to the inlet opening 31 of said gas inlet duct 30. Though not illustrated, it should be understood that the closed end may be also provided adjacent to the outlet opening of the same gas duct . In another constructive alternative, not illustrated, the opening defined in the region of minimum acoustic pressure is one of the inlet and outlet openings 21, 22, 31, 32, 41, 42 of each gas inlet and gas outlet duct 20, 30, 40 inside the hollow body 10, in a respective dampening chamber 13, 14.
From the definition of the geometry of the gas duct
20, 30, 40 (or other ducts that might be provided in the hollow body 10) provided with at least one closed end 23, 33, an acoustic mode is determined to have a certain attenuated frequency, said attenuation occurring in the region of the gas duct or ducts 20, 30, 40 having a minimum acoustic node, that is, in the regions with minimum pressure. The pressures reigning in each of the gas ducts 20, 30, 40 of the suction muffler are the stationary or acoustic pressures presenting regions of minimum and maximum pressure. Once the minimum pressure regions are determined, one can determine the region to provide said inlet opening
21, 31, 41 or outlet opening 22, 32, 42 and the respective closed ends 23, 33 of each duct 20, 30, 40.
Each gas duct 20, 30, 40, provided with an opening or openings in nodal regions, presents each respective closed end 23, 33 constructed in such a way as to avoid any direct communication of the gas with the interior of the hollow body 10 of said suction muffler.
In a constructive option of the present invention, as illustrated in figure 3, an inner sidewall portion of the hollow body 10 defines a cover portion in which is tightly fitted the closed end 23, 33 of a gas duct 20, 30, 40, said cover portion being retained therein by appropriate retaining means, such as glue, clamps, projections or by interference. In the constructive options illustrated in figures 4 e 5, each closed end 23, 33 incorporates the respective cover, which is for example defined as a single piece with the remaining of the respective body of the gas duct 20, 30, 40, for example by injection, jointly with the formation of the duct in a single piece, or by over-injection. In another constructive option of the present invention, the gas duct 20, 30, 40 carries and secures a cover closing an adjacent closed end 23, 33. According to the present invention, the closed end 23, 33 is defined in a plane intercepted by the direction of the gas flow passing through the opening defined in a nodal region of minimum acoustic pressure of the respective gas duct 20, 30, 40, said opening positioning allowing the pressure to be taken at a point of minimum acoustic pressure, generating high acoustic attenuation in a determined frequency band, as illustrated in figure 6.
In another constructive option, the closed end 23, 33 is defined in a plane parallel to the direction of the gas flow passing through the first of said openings 21, 31; 22, 32, 42 of one of the first, second and third gas ducts 20, 30, 40, said opening positioning also allowing the pressure to be taken at a point of minimum acoustic pressure, generating high acoustic attenuation in a determined frequency band, as illustrated in figure 6. Specific aspects of the invention are shown in the figures of the drawings for convenience only, as each aspect can be combined with other aspects according to the invention. Other embodiments will be recognized as possible by those skilled in the art and should be included in the scope of the claims. Accordingly, the description above should be construed as illustrative and not as limitative of the scope of protection of the invention. All such obvious modifications and alterations are found in the scope of protection defined in the appended claims.

Claims

1. A suction muffler for a refrigeration compressor mounted within a shell (1) , said suction muffler comprising a hollow body (10) defining at least one dampening chamber (13, 14) that carries a gas inlet duct (20) having an inlet opening (21) external to the dampening chamber (13, 14) and an outlet opening (22) in the interior of the dampening chamber (13, 14) and a gas outlet duct (30) presenting an inlet opening (31) in the interior of the dampening chamber (13, 14) and an outlet opening (32) external to said dampening chamber (13, 14) , characterized in that at least one of the gas inlet duct and gas outlet duct (20, 30) presents at least one closed end (23, 33), one of the inlet and outlet openings (21, 22, 31, 32) being positioned at a certain distance from said closed end
(23, 33), along the respective duct (20, 30), smaller than the distance of said opening in relation to the other opening of the same duct (20, 30) and in a region of the latter presenting a minimum acoustic pressure for a determined frequency, the dimensioning of said duct (20, 30) and of the cross section of the first of said openings (21, 31; 22, 32) being achieved so as to minimize the gas pulsation noises inside the suction muffler.
2. The suction muffler, as set forth in claim 1, characterized in that the gas inlet duct (20) has its inlet opening (21) connected to a suction line of a refrigeration system to which the compressor is coupled.
3. The suction muffler, as set forth in any one of the claims 1 and 2, characterized in that the gas outlet duct (30) has its outlet opening (32) in fluid communication with a suction orifice (7a) provided in a valve plate (7) of the compressor.
4. The suction muffler, as set forth in claim 3, characterized in that the outlet opening (32) of the gas outlet duct (30) is maintained in fluid communication with the suction orifice (7a) through another dampening chamber (14) having another gas outlet duct (40) presenting an inlet opening (41) opened to the interior of said other dampening chamber (14) and an outlet opening (42) connected to the suction orifice (7a) .
5. The suction muffler, as set forth in claim 4, characterized in that at least one of the gas inlet and gas outlet ducts (30, 40) in the other dampening chamber (14) has at least one closed end (33) , one of the inlet and outlet openings (31, 41, 32, 42) being positioned at a certain distance from said closed end (33) , along the respective duct (30, 40) , smaller than the distance of said opening in relation to the other opening of the same duct (30, 40) and in a region of the latter-presenting a minimum acoustic pressure for a determined frequency, the dimensioning of said duct
(30, 40) and of the cross section of the first of said openings (31, 41, 32, 42) being achieved in such a way as to minimize the gas pulsation noises in the interior of the suction muffler.
6. The suction muffler, as set forth in any one of the claims 1 to 5, characterized in that the closed end (23, 33) is submitted to the same gas pressure reigning in said region of minimum acoustic pressure.
7. The suction muffler, as set forth in claim 6, characterized in that the distance between the medium line of the first of said openings (21, 31, 41; 22,
32, 42) and the closed end (23, 33) of the gas duct
(20, 30, 40) is greater than half the diameter of said opening (21, 31, 41; 22, 32, 42) .
8. The suction muffler, as set forth in claim 7, characterized in that the closed end (23, 33) is defined in a plane intercepted by the direction of the gas flow passing through the first of said openings (21, 31, 41; 22, 32, 42) of the gas duct (20, 30, 40) .
9. The suction muffler, as set forth in claim 8, characterized in that the closed end (23, 33) is defined in a plane parallel to the direction of the gas flow passing through the first of said openings (21, 31, 41; 22, 32, 42) of the gas duct (20, 30, 40).
10. The suction muffler, as set forth in any one of the claims 1 to 9, characterized in that at least one closed end (23, 33) is defined by a wall portion of the hollow body (10) .
11. The suction muffler, as set forth in any one of the claims 1 to 9, characterized in that at least one closed end (23, 33) carries a cover.
12. The suction muffler, as set forth in claim 11, characterized in that the cover is incorporated to the respective closed end (23, 33).
EP06721643A 2005-05-03 2006-05-02 Suction muffler for a refrigeration compressor Withdrawn EP1877664A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BRPI0501740-8A BRPI0501740A (en) 2005-05-03 2005-05-03 refrigeration compressor suction filter
PCT/BR2006/000085 WO2006116830A1 (en) 2005-05-03 2006-05-02 Suction muffler for a refrigeration compressor

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EP1877664A1 true EP1877664A1 (en) 2008-01-16

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US (1) US20090038329A1 (en)
EP (1) EP1877664A1 (en)
JP (1) JP2008540891A (en)
KR (1) KR20080005930A (en)
CN (1) CN101171424A (en)
BR (1) BRPI0501740A (en)
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WO (1) WO2006116830A1 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008069334A1 (en) * 2006-12-06 2008-06-12 Panasonic Corporation Refrigerant compressor
BRPI1103315B1 (en) 2011-07-29 2021-07-20 Embraco Indústria De Compressores E Soluções E Refrigeração Ltda. SUCTION CHAMBER
JP2013231429A (en) * 2012-04-06 2013-11-14 Panasonic Corp Hermetic compressor
CN102720655B (en) * 2012-06-20 2014-07-30 常熟市天银机电股份有限公司 Suction muffler for refrigeration compressor
KR101854933B1 (en) * 2013-04-24 2018-05-04 엘지전자 주식회사 Muffler for compressor and compressor having the same
WO2016145503A2 (en) * 2015-03-19 2016-09-22 Whirlpool S.A. Suction acoustic filter for compressor
WO2017211705A1 (en) 2016-06-07 2017-12-14 Arcelik Anonim Sirketi A hermetic compressor comprising a partially-elastic suction muffler
CN106121972A (en) * 2016-07-22 2016-11-16 广州万宝集团压缩机有限公司 A kind of refrigeration compressor valve plate and the attachment structure of deafener
EP3869040A1 (en) * 2018-01-12 2021-08-25 LG Electronics Inc. Linear compressor and refrigerator including same
AT17214U1 (en) * 2019-12-19 2021-09-15 Anhui meizhi compressor co ltd Hermetically sealed refrigerant compressor
CN111140466A (en) * 2019-12-19 2020-05-12 西安交通大学 Suction muffler for compressor
EP4033097B1 (en) * 2020-11-30 2024-04-24 Anhui Meizhi Compressor Co., Ltd. Suction muffler
CN114576138B (en) * 2020-11-30 2023-04-28 安徽美芝制冷设备有限公司 Suction muffler

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4330239A (en) * 1979-10-10 1982-05-18 Tecumseh Products Company Compressor muffler
PL156570B1 (en) * 1987-11-27 1992-03-31 Zaklady Budowy Maszyn I Aparat Gas pressure pulsation and noise damper
KR200141490Y1 (en) * 1993-04-24 1999-05-15 김광호 Noise-reducing apparatus of a compressor
US5996733A (en) * 1998-11-20 1999-12-07 Thermo King Corporation Dual frequency side branch resonator
DE10003882C2 (en) * 2000-01-29 2003-10-02 Bitzer Kuehlmaschinenbau Gmbh Refrigerant compressor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006116830A1 *

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US20090038329A1 (en) 2009-02-12
CN101171424A (en) 2008-04-30
WO2006116830A1 (en) 2006-11-09
JP2008540891A (en) 2008-11-20
KR20080005930A (en) 2008-01-15
MX2007013709A (en) 2008-04-10
BRPI0501740A (en) 2006-12-12

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