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
  • F04B39/0072—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes characterised by assembly or mounting
• • 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
  • F04B39/02—Lubrication
  • F04B39/0223—Lubrication characterised by the compressor type
  • F04B39/023—Hermetic compressors

Definitions

• the present invention refers to an acoustic attenuating device applied in hermetic compressors, preferably in reciprocating compressors usually used in cooling systems in general. More particularly, the present invention refers to an acoustic attenuating device comprising technical, structural and functional features capable of decrease the level of noise of hermetic compressors in a general way, but principally eliminate problems caused by drag oil together with refrigeration fluid inside the cooling system.
• hermetic compressors As it is known by those skilled on the art, most part of the hermetic compressors, usually applied on cooling systems, comprises at least one acoustic attenuating device disposed inside the carcass, particularly on the suction line and/or exhaust line, being the main purpose of this device attenuate pumping pulses of coolant gas to reduce the hermetic compressor noise, and also thermally isolate the coolant fluid.
• this type of acoustic attenuating device can present different nomenclatures, specially, depending on its installation position related to the compression unit.
• suction acoustic filter or suction muffler are usual when the referred attenuating device is positioned on the suction line, in a way to promote the coolant gas conduction from strainer on the direction of the suction valve.
• nomenclatures are adopted as expansion chamber or expansion muffler, or also can be named as exhaust chamber or exhaust muffler.
• the acoustic attenuators device applied in compressor well known on the prior art comprises constructive and functional configurations really complexes that affect, mainly, the production lines and compressors assembly and, consequently, of equipment and cooling systems in general. More particularly, appears that the devices from the prior art comprises structures of reduced dimensions which ends up requiring precision levels and components finishing substantially high to obtain the security in conducting and directing coolant gases, besides the acoustic attenuation and, eventually, on thermal isolation of these gases.
• these acoustic attenuating devices are formed by a hollow body in which are provided chambers and ducts for coolant gases circulation from, and to the compression unit.
• this gases circulation is caused by compression chamber pulse, which generates noise that are softened as the structural and geometrical features of ducts and chambers through which gases circulate, this is, the attenuation level of noises can be higher or lower according to the specificities and the constructive details of the acoustic attenuating device applied on the compressor.
• this inconvenient are particularly related to structural aspects for manufacturing and assembling this chambers and coolant gases circulating ducts. This is because, this chambers and ducts are formed by several pieces and walls that should be fitted together in a way to obtain an adequate geometry of chambers and ducts for the correct acoustic attenuation inside the attenuating device.
• Another inconvenient of these devices from the prior art is related to the configuration and shaping of internal ducts for gas circulation, which ends up needing applying some intermediate further pieces to form an acoustic filter for attenuating properly the pulses coming from the compression system, causing determined excitation to the compressor set that, in the end, when functioning, will have a determined acoustic behavior (perceptible to human being) that in real is a noise spectrum because of frequency.
• said acoustic chambers are formed by the disposal of an intermediate element, which is formed by a platform having at least one connection channel that is fluidly connected between the acoustic chambers and surrounds the output channel that is connected to the output port.
• connection channel and the gas output channel, in order to obtain the proper geometry of the chambers, ducts and volume inside the muffler to correct acoustic attenuation.
• this CEO is the percentage of pumping oil together with the coolant fluid inside the cooling system, once that, inside of the compressor has bearing lubricating oil. In case this percentage of CEO exceed a predetermined value, the level of oil inside the compressor can decrease and, with this, endangers the integrity of functional components of compressor, in view of the low index of lubricating.
• This concentric condition favors oil pumping, once the fluid flow strength by contemplated region between the intermediate pipe and by the pipe connected directly on the headstock, which in turn has the lower pressure values inside the chamber.
• Other constructions has also advantage related to oil purge from inside the chamber comparing to this construction due to the distance between the pathways that the fluid (coolant gas with oil) runs until finding the pipe connected directly to headstock.
• the acoustic attenuating device object of the present invention, can be applied both in suction lines and in exhaust lines of hermetic compressors. Therefore, it is important to be clear that the follow description will mention simply the attenuating device, should be interpreted as broadly as possible, and independent of the positioning inside the compressors.
• an attenuating device particularly developed to be applied in hermetic compressors usually used on cooling systems being said device comprised by technical, structural and functional features capable of simplify its manufacturing process and increase noise attenuation levels, but mainly eliminate eventual inconvenient related to CEO percentage control.
• an object of the present invention provide an acoustic attenuating device for hermetic compressors whose chamber configuration and internal ducts promote safety control and maintenance of CEO percentage levels and, consequently, becomes impossible keep the oil level currently packed inside the compressors, without risking the lubricating parameters and functional components integrity of the compressor.
• an object of the invention propose an acoustic attenuating device for hermetic compressors, in which channels and chambers comprises a configuration that allows gas circulation, but particularly is capable of increasing noise attenuation levels, specially, due to accommodation conditions of the output channel.
• the present invention refers to an attenuating device for applying on suction and/or exhaust lines of hermetic compressors, being comprised by technical, structural and functional aspects for improving the noise reduction, but mainly eliminate problems with oil external circulation (CEO) percentage no the cooling system.
• CEO oil external circulation
• the attenuating device is comprised by an hollow body closed by a lid, to obtain an structure having at least one input port and one output port, wherein, internally, said structure is divided into at least two acoustic chambers (A, A') according to disposal of an intermediate body formed by a platform having a connection channel built by two sub-channels, wherein one of them is capable of accommodate totally the bottom part of the output channel.
• This output channel has on its body a peripheral protrusion responsible for promoting the blocking of said sub-channel.
• the remaining sub-channel of the connection channel is completely unobstructed allowing the coolant gas to circulate between the acoustic chambers.
• the bottom portion of said output channel is fully accommodated inside one of the sub-channels, preferentially, the end of this output channel should be recessed related to the end of the sub-channel where it is located.
• the hollow body, the lid and the intermediate body are manufactured in low thermal conductivity material. Besides, fixing the edge of said hollow body with the edge of said lid, pressing and locking said intermediate body could be done using welds, glues, adhesives or mechanical locks.
• the acoustic attenuating device, object of present invention can be set with a plurality of acoustic chambers, through the disposal of further adapters and intermediate bodies.
• said lid and said output channel are manufactured in one piece or independently, when they will be connected and fixed later during assembly line of attenuating devices.
• Figure 1 shows an acoustic attenuating device for hermetic compressors, such as the known models of the prior art
• Figure 2 shows a partial sectional view of a hermetic compressor having an acoustic attenuating device, according to one preferred embodiment of the present invention
• Figure 3A shows the lid of the acoustic attenuating device structure, according to present invention
• Figure 3B shows the intermediate body of the acoustic attenuating device structure, according to present invention
• Figure 3C shows the hollow body of the acoustic attenuating device structure, according to present invention.
• Figure 4 shows a sectional view of the acoustic attenuating device structure, according to present invention
• Figure 5 shows a partial sectional view from the interaction and connection region between the structural components of the acoustic attenuating device, object of present invention.
• Figure 1 presents an acoustic attenuating device, representing the prior art, such as the mentioned and defined on patent document BR10201301931 1 -9, which is comprised, basically by an hollow body 20 closed by a lid 21 , forming an structure having at least one input port 22 and an output port 23, wherein between said hollow body 20 and said lid 21 is disposed at least one intermediate body 24 dividing said structure for at least two acoustic chambers A, A'.
• said intermediate body 24 has a platform 25 having at least one connection channel 26 that fluidly communicates said acoustic chambers A, A' and, further, surrounds partially the output channel 27 that is connected to said output port 23 and, particularly fixed together with said lid 21.
• Figure 2 shows a partial sectional view of an hermetic compressor formed by a carcass C, wherein inside is accommodated the compression unit U having, conventionally, suction and exhaust valves to promote proper functioning of the cooling system.
• Said carcass C has, still, at least one throughout P that is connected at least to a suction line of the cooling system, as well as has an output S responsible for the connection with the exhaust line of the system.
• the acoustic attenuating device 10, object of present invention is particularly disposed inside the carcass C of hermetic compressor, connecting the suction or exhaust lines with the compression unit U.
• the device of present invention can be easily applied in any of the lines, either suction or exhaust, depending exclusively on the manufacturer's interests and projects.
• Figure 2 presents an embodiment whose acoustic attenuating device 10 is installed together with the suction valve of compression unit U.
• the attenuating device 10 resembles conceptually to those revealed on document BR10201301931 1 -9, however, as will be evident from the following description, the attenuating device 10, object of present invention, comprises technical and structural aspects specific capable of improve substantially the work conditions of these devices, mainly by comprising elements that are capable of eliminate eventual risks with the problems of lack of control of CEO levels.
• the acoustic attenuating device 10, according to present invention also comprises a hollow body 20 closed by a lid 21 , in a way to conform a structure having at least one input port 22 and one output port 23.
• said structure is divided in two acoustic chambers A, A' by means of an intermediate body 24 formed by a platform 25 which has a connection channel 26 having two subchannels 26a and 26b, wherein one of this sub-channels, for example, the subchannel 26a, accommodates fully the bottom part of the outlet channel 27.
• the blocking means 28 comprises a sealing element capable of precluding liquid fluid flow between internal face of sub-channel 26a and external face of output channel 27.
• the blocking means 28 comprises a peripheral protrusion disposed on the bottom portion of output channel 27, and is responsible for blocking said sub-channel, in a way to allow the coolant gases to be conducted between such acoustic chambers A, A' only by the remaining sub-channel 26b.
• object of present invention can eliminate the risks of unwanted alteration of CEO percentage, wherein the pathway blocking between the two surfaces of output channel 27 and sub-channel 26a eliminate the drawbacks caused by oil drag above the predetermined inside the cooling system and, with this, ensure the suitable and safety functioning of the compressor.
• the bottom portion of said output channel 27 is totally accommodate inside the sub-channel 26a, but mainly the end 27a of said output channel 27 still recessed related to the end 26a' of sub-channel 26a, namely, output channel 27 is packed and protected by sub-channel 26a walls and, with this, generate a kind of baffle chamber 29 that can provide the increase on the attenuation level of noise, given that such disposal provides the resonance Helmholtz effect.
• forming said acoustic chambers A, A', as well as the channel where the gas flow is taken do not present sealing complementary elements and/or complex structures that require manufacturing precision and connection between the components, in addition to present a considerably reduced number of element to structural forming of the attenuating device, when compared to those devices more traditional from the prior art.
• the components of the attenuating device 10 are made of a low thermal conductivity material, to reduce the impact on gas properties and, consequently, the refrigeration system efficiency generally.
• the fixing of the edge of the hollow body 20 with the edge of said lid 21 , compressing and locking the intermediate body 24 can be accomplished by any known means, e.g., welds, glues, adhesives, mechanical interlocks, etc.
• the attenuating device according to the present invention is not restricted to this configuration and it may eventually be configured with a plurality of acoustic chambers, and to do so, just the combination and arrangement of intermediate adapters and intermediate bodies additional 24, providing that keep blocked the passage between the surfaces of the output channel 27 with the sub-channels 26a and the recessed arrangement between the ends of those channels.
• said output channel 27, is manufactured together with said lid 21 , i.e., said lid 21 and said output channel 27 are manufactured in one piece.
• these components can be manufactured independently and then connected during the assembly process of the attenuating device, object of the present invention.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Compressor (AREA)

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• 2014
  • 2014-10-08 BR BR102014025140-5A patent/BR102014025140B1/pt active IP Right Grant
• 2015
  • 2015-10-06 WO PCT/BR2015/050168 patent/WO2016054710A1/en not_active Ceased
  • 2015-10-06 CN CN201580060943.6A patent/CN107110141B/zh active Active
  • 2015-10-06 US US15/516,941 patent/US10502198B2/en active Active
  • 2015-10-06 EP EP15785045.4A patent/EP3204645B1/en active Active
  • 2015-10-06 ES ES15785045T patent/ES2806451T3/es active Active
  • 2015-10-06 JP JP2017518875A patent/JP6659009B2/ja active Active

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