Acoustic Attenuating Device for Compressors

Abstract

Acoustic attenuating device for compressors which includes a hollow body having at least one input port, at least one output channel, at least one output port disposed in the at least one output channel, an intermediate body dividing the hollow body into two acoustic chambers, and a connection channel communicating the two acoustic chambers. Said connection channel includes two sub-channels, wherein one of the two sub-channels accommodates, at least partially, the output channel and the other one of the two sub-channels conforms fluid communication between the two acoustic chambers. The acoustic attenuating device further includes at least one blocker disposed between the outer side of the output channel and the inner side of the sub-channel which accommodates the output channel, wherein said blocker is capable of precluding flow between the two acoustic chambers, thereby reducing the amount of lubricating oil which flows out from the compressor into the cooling system.

Claims

1. Acoustic attenuating device for compressor, comprising: a hollow body (20) shaping an structure having at least one input port (22), at least one output channel (27) and at least one output port (23) disposed in at least one output port (27); said structure shaping said hollow body (20) defining at least two acoustic chambers (A, A′), which are defined by at least one intermediate body (24); said intermediate body (24) being shaped by platform (25) that has a connection channel (26) capable of conforming fluid communication between the at least two acoustic chambers (A, A′); said connection channel (26) being built by at least two sub-channels (26a, 26b); at least one among at least two sub-channels (26a, 26b) accommodate, at least partially, the output channel (27); the acoustic attenuating device for compressors being specially characterized by still comprising at least one blocking means (28) disposed between at least two sub-channels (26a, 26b) and the output channel (27).

2. Acoustic attenuating device for compressor, according to claim 1, wherein the blocking means (28) comprises a sealing element capable of block the flow of liquid flow between the internal side of at least two sub-channels (26a, 26b) and the external side of the output channel (27).

3. Acoustic attenuating device for compressor, according to claim 2, wherein the blocking means (28) comprises a peripheral protrusion disposed on the externa side of the output channel (27).

4. Acoustic attenuating device for compressor, according to claim 1, wherein the bottom portion of said output channel (27) is totally accommodated inside the sub-channel (26a), preferably, the end (27a) of said output channel (27) being recessed related to the end (26a′) of sub-channel (26a).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The features, advantages and technical effects of present invention, as above mentioned, will be better understood by those skilled on the art from the following detailed description, which is merely an example, and not restrictive, of preferred embodiments of the invention, being made referring to appended schematic figures, in which:

[0031] FIG. 1 shows an acoustic attenuating device for hermetic compressors, such as the known models of the prior art;

[0032] FIG. 2 shows a partial sectional view of a hermetic compressor having an acoustic attenuating device, according to one preferred embodiment of the present invention;

[0033] FIG. 3A shows the lid of the acoustic attenuating device structure, according to present invention;

[0034] FIG. 3B shows the intermediate body of the acoustic attenuating device structure, according to present invention;

[0035] FIG. 3C shows the hollow body of the acoustic attenuating device structure, according to present invention;

[0036] FIG. 4 shows a sectional view of the acoustic attenuating device structure, according to present invention;

[0037] FIG. 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.

DETAILED DESCRIPTION OF THE INVENTION

[0038] Thus, according to the schematic figures above mentioned, some examples of preferred and possible embodiments of present invention will be described more detailed next, however, it should be clear that is about a description merely exemplificative and not restrictive, once the present acoustic attenuating device for hermetic compressors of cooling systems in general, can present and comprise different details and technical, structural and sizing features without, with this, be apart from the protection scope.

[0039] FIG. 1 presents an acoustic attenuating device, representing the prior art, such as the mentioned and defined on patent document BR102013019311-9, 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′. As can be seen still referring to FIG. 1, 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.

[0040] FIG. 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.

[0041] 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. Worth reiterating that 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. By way of representation, FIG. 2 presents an embodiment whose acoustic attenuating device 10 is installed together with the suction valve of compression unit U.

[0042] In this context, and as can be found, the attenuating device 10 resembles conceptually to those revealed on document BR102013019311-9, 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.

[0043] Thus, 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. Internally, 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 sub-channels 26a and 26b, wherein one of this sub-channels, for example, the sub-channel 26a, accommodates fully the bottom part of the outlet channel 27.

[0044] It is further provided a blocking means 28 disposed between the internal face of sub-channel 26a and the external face of output channel 27. In general, 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.

[0045] According to one preferred embodiment of current invention, 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.

[0046] On this condition, it is highlighted that the acoustic attenuating device 10, 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.

[0047] Furthermore, it is noted that 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.

[0048] As can be seen, 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.

[0049] Particularly, it is noted that leaking risks of gases on attenuating device of present invention, inside or outside are considerably reduced, mainly because the intermediate body 24 is fixed directly on the edge of the hollow body 20 and on the lid 21, allowing also the application of more effective means of external fixing, once it is about regions easily accessed after the assembly of the device as a whole. Unlike the more traditional prior art devices whose dividers and channels are positioned and interconnected inside the hollow body and must be secured to each other prior to the effective device assembly.

[0050] Further, because of the recessed disposal of the output channel 27 in relation to the sub-channel 26a, is achieved greater control over the CEO percentage and consequently provide a much more precise and optimized quantity of oil within the compressor, which certainly will lead in reduction of costs and benefits in production lines and maintenance of the compressor.

[0051] According to preferred embodiments of the present invention, 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. Furthermore, 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.

[0052] Although the present description and figures make reference only to the embodiments formed by two acoustic chambers (A, A′), 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.

[0053] Additionally, said output channel 27, according to a preferred embodiment of the present invention is manufactured together with said lid 21, i.e., said lid 21 and said output channel 27 are manufactured in one piece. Optionally, and as should be appreciated by the skilled in the art, these components can be manufactured independently and then connected during the assembly process of the attenuating device, object of the present invention.

[0054] Finally, before all presented above, it should be clear that the present description is intended solely define exemplary preferred embodiments of the attenuating device according to the present invention, which are designed to compressor preferentially used on cooling systems in general. Therefore, as well as the skilled in the art comprises, numerous modifications are possible, variations and constructive combination of elements that perform the same substantially function to achieve the same results, which should be included within the scope of protection defined by the appended claims.