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
• • 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
  • F04B39/06—Cooling; Heating; Prevention of freezing

Definitions

• the present invention refers to an acoustic attenuator device for hermetic compressors, preferably for alternative compressors commonly used in refrigeration systems in general. More particularly, the present invention refers to an acoustic attenuator comprising technical, structural and functional features capable of simplifying the manufacture process of these parts as well as increasing the acoustic attenuation levels of said hermetic compressors, in general.
• hermetic compressors applied to refrigeration systems are provided with a device disposed inside the compressor housing, and, more specifically in the suction line and/or discharge line, which purpose is, in addition to conveying refrigerant gas, to reduce the noise caused by strokes and vibrations of suction valve and compression chamber, It also aims at thermally insulating refrigerant gas.
• acoustic attenuator devices also known as “muffler”
• suction filter or suction muffler is very common when an attenuator device is disposed in the suction line so as to conduct the refrigerant gas from the strainer to the suction valve.
• nomenclatures of expansion chamber or expansion muffler types are used.
• Attenuator devices known from the state of the art present relatively complex configurations and are difficult to manufacture and mount mainly because they comprise small structures and require high levels of accuracy and finishing to ensure the direction of gases, acoustic muffling and in some cases thermal insulation of these gases. More specifically, it is observed that attenuator devices known from the state of the art comprise a hollow body within which chamber and ducts are disposed to conduct gases to and from the compression unit. As can be appreciated by a person skilled in the art, this displacement of gases is generated by pulsation of the compression chamber which, consequently, generates noises, which can be attenuated according to the specificities of these chambers and ducts through which the gases pass.
• a drawback of these already known devices resides in the structural aspects for assembling these chambers and inner ducts to conduct gases. More particularly, it is noted that the present state of the art comprises chambers and ducts formed by several parts and walls which are engaged with each other to obtain an extension of pathways for gas circulation inside an attenuator device. However, considering the number of inter-related parts, it is noted that there is a great number of interaction which causes gas leakage, that is, as it is known by a person skilled in the art the greater the number of parts connected therebetween the higher is the risk of leakage, thereby directly affecting the acoustic attenuation levels, mainly operation conditions of the compressor.
• the attenuator devices for hermetic compressors present some limitations and drawbacks which have a direct impact on the attenuation level of noise, mainly because their configurations are rather complex and difficult to mount.
• the attenuator device of the present invention can be applied either to suction lines or to discharge lines of the compressors. Hence, for this reason, the description below will simply refer to an attenuator device, and as such it should be clear that such nomenclature shall be interpreted in a simple form, whereby any positions within the hermetic compressors are herein contemplated.
• the object of the present invention is to provide an attenuator device to be applied to hermetic compressors commonly used in refrigeration systems, wherein it comprises technical, structural and functional features specifically developed to simplify the method of manufacturing said devices but mainly to improve the capacity of attenuating noises.
• the object of the present invention is to provide an attenuator device for hermetic compressors, which is capable of reducing and even eliminating eventual risks of gas leakage between chambers and ducts contained inside the attenuator device body to provide conditions suitable for the due circulation of refrigerant gases.
• an object of the present invention is to provide an attenuator device to be applied to hermetic compressors, which structural features permit to obtain a simple but highly efficient construction relative to the seal between the acoustic chambers, without impairing the conduction of gases between the chambers.
• the object of the present invention is to provide an attenuator device for hermetic compressors, which technical and structural features allow for forming acoustic chambers and ducts to conduct refrigerant gases through an assembly containing a substantially reduced number of parts, and mainly containing suitable and safe sealing means.
• the present invention refers to an attenuator device to be applied to suction and/or discharge lines of hermetic compressors, wherein said device comprises a hollow body that is closed with a cover so as to form a structure having at least one inlet hole and one outlet hole. More particularly, at least one intermediate body capable of dividing said structure into at least two acoustic chambers is disposed between said hollow body and said cover, wherein said intermediate body is formed by a platform provided with at least one connecting channel which is in fluid communication between said acoustic chambers and also surrounds the outlet channel that is connected to the outlet hole, preferably disposed on said cover.
• said connecting channel and said outlet channel form a space sufficient to allow gases to pass between said acoustic chambers.
• said connecting and outlet channels are concentrically disposed, but they may alternatively be disposed in an off-centered form, that is, said channel may or may not coincide with the geometric centers.
• the intermediate body comprises a connecting channel having a configuration with "8"-shaped section, that is, two partially overlapped circumferences.
• said connecting channel section may also be in other forms, such as, for example, squared, rectangular, triangular, oval, star forms, etc.
• the outlet channel can be provided with a section with shapes equivalent to the shape of the connecting channel as well as different forms and a space between the connecting channel and the outer surface of the outlet channel must be provided to form a space sufficient for the passage of gases.
• said intermediate body is fixed directly to the edges of said hollow body and said cover.
• said body, cover and intermediate body are made of low thermal conductivity material.
• fixation of the edge of said hollow body to the edge of said cover, pressing and locking said intermediate body can be effected using welds, glues, adhesives or mechanical locks.
• the acoustic attenuator device comprises an intermediate adapter disposed between the hollow body and the cover to form additional acoustic chambers.
• the acoustic attenuator device for compressors comprises two intermediate bodies respectively disposed and secured between the edges of said hollow body to the intermediate adapter, and between the edge of this adapter to the edge of said cover.
• said intermediate adapter is made by incorporating an intermediate body, thus eliminating a fixing step during the processes and, consequently, an eventual fragility concerning leakage risks is prevented.
• the acoustic attenuator device of the present invention can have its structural elements in vertical or horizontal form, that is, the platforms of the intermediate bodies should be horizontally or vertically disposed.
• said cover and the outlet channel are fabricated into one single part or in an independent form, and they can be subsequently connected during the assembling lines of the attenuator devices.
• Fig. 1 illustrates a partial cut view of a hermetic compressor containing an attenuator device in accordance with the present invention
• Fig. 2 illustrates a perspective exploded view of the attenuator device of the present invention
• Fig. 3 illustrates a front view of the attenuator device of the present invention
• Fig. 4 illustrates a cut view of the attenuator device depicted in Fig. 3;
• Figs. 5A, 5B, 5C and 5D illustrate schematic views of alternative embodiments of the attenuator device of the present invention
• Fig 6 illustrates a perspective view of an alternative embodiment of the intermediate body of the attenuator device of the present invention.
• Fig. 7 illustrates an upper view of the intermediate body depicted in
• Fig. 1 shows a partial cut view of a compressor formed of a hermetic housing (C), within which a compression unit (U) is accommodated, which is conventionally equipped with suction and discharge valves to allow for the appropriate refrigeration system operation.
• said hermetic housing also comprises at least one strainer (P) connected to at least one refrigeration system suction line and further an outlet (S) for connection with the discharge line of the same suction system.
• the attenuator device (10) of the present invention is connected to both suction or discharge lines, in particular still within the hermetic housing (C), and more preferably connected to the compression unit (U). As mentioned above, said attenuator device 10 can be applied either to suction line or to discharge line, varying in accordance with manufacturers' interests and designs.
• FIG. 1 shows a configuration in which said attenuator device 10 is installed near the suction valve of the compression unit (U).
• the attenuator device 10 can be easily applied near the discharge valve of said compression unit (U) provided that the technical and structural features as described below are maintained.
• the attenuator device 10 of the present invention comprises a hollow body 20 closed by a cover 21 , forming at least a structure provided with at least one inlet hole 22 and one outlet hole 23, wherein an intermediate body 24 is provided between said hollow body 20 and said cover 21 to divide said structure into at least two acoustic chambers (A, A'), and it is formed by a platform 25 containing at least one connecting channel 26 in fluid communication with said acoustic chambers (A, A') and also surrounding the outlet channel 27 that is interconnected with said outlet hole 23 disposed on said cover 21.
• gas entering the structure of said attenuator gas 10 through the inlet hole 22 is conducted to the first acoustic chamber (A), which is fully filled with gas that is sequentially conducted to the second acoustic chamber ( ⁇ ') through said connecting channel 26, particularly through the space formed between this connecting channel 26 and the outer surface of the outlet channel 27.
• Said second acoustic chamber ( ⁇ ') is then filled with gas, and depending on the compression unit pulsation the gas will be conducted through the outlet channel 27 up to the outlet hole 23.
• the formation of the acoustic chambers as well as the channels through which the gas flow is conducted do not present sealing means by simple interference as well as there is a substantial reduction in the number of elements to structurally form the attenuator device. More specifically, it is observed that risks of gas leakage either inside or to the outside of the attenuator device of the present invention are considerably reduced, mainly because the intermediate body 24 is directly secured to the edges of the hollow body 20 and to the cover 21 , also permitting using more effective means of external fixation once they refer to easily accessed regions after the device is assembled as a whole. This is unlike the state-of-the-art devices, whose partitions and channels are disposed and interconnected within the hollow body and need to be secured between one another before the device is effectively mounted.
• components of the attenuator device 10 are made of a low thermal conductivity material to reduce impact on the gas properties and, consequently, on the efficiency of the refrigeration system in general.
• fixation of the edge of the hollow body 20 to the edge of said cover 1 , by pressing and locking the intermediate body can be carried out by any known means, such as, for example, welds, glues, adhesives, mechanical locks, etc.
• the relationship of the positioning between the connecting channel 26 and the outlet channel 27 can preferably be in a concentric form, i.e., aligned with the same geometric center.
• said relationship between said channels can be off-centered, that is, off the geometric center, provided that a space between the connecting channel 26 and the outer surface of the outlet channel 27 sufficient for gas passage is maintained.
• FIGs. 6 and 7 it is observed that an alternative embodiment of the intermediate body 24 that helps to conduct the gas flow of the first acoustic chamber (A) towards the second acoustic chamber ( ⁇ '), wherein, in this case, said connecting channel 26 comprises a configuration having a "8"- shaped section, that is, with two partially overlapped circumferences.
• said connecting channel section is circular or "8"-shaped
• said section of the connecting channel 26 can also be in other forms, for example, squared, rectangular, triangular, oval, star forms, etc.
• outlet channel 27 can also be in a form equivalent to that of the connecting channel 26 as well as different forms provided that there will exist a space between said connecting channel 26 and the outer surface of the outlet channel 27, as mentioned above.
• Figs. 5A to 5D illustrate two alternative embodiments of the attenuator device of the present invention. More particularly, Figs. 5A and 5B show embodiments containing an inlet hole 22 and an outlet hole 23 which are very similar to those models depicted in Figs. 1 to 4. With regard to Figs. 5C and 5D, they show embodiments in which the structure of the attenuator device 10 is provided with two inlet holes 22 and one outlet hole 23, wherein such kind of embodiment is very useful for refrigeration systems equipped with two suction lines, e.g. the hermetic line and the equalized line.
• two suction lines e.g. the hermetic line and the equalized line.
• the attenuator device of the present invention comprises three acoustic chambers A, A' and A", wherein the acoustic chamber A" is formed by disposing an intermediate adapter 28 between said hollow body 20 and cover 21.
• two intermediate bodies 24, duly positioned and secured between the edges of said body 20 with the intermediate adapter 28, and between the edge of this adapter 28 with the edge of the cover 12 are respectively disclosed.
• said intermediate adapter 28 can be made by introducing one of the intermediate bodies 29, which would facilitate the production and assembling lines of the two attenuator devices 10 in addition to reducing leakage risk since this would eliminate one of the regions of fixation between the parts.
• gases enter the first chamber (A) through inlet orifices 22, said gases being conducted by the first connecting channel 26, thus filling the intermediate acoustic chamber (A").
• the gases are conducted through the second connecting channel 26 towards the second acoustic chamber ( ⁇ ') and, subsequently, these gases exit the outlet channel 27 towards the outlet hole 23.
• the structure of the attenuator device 10 can be in a vertical form, as depicted in Figs. 1 to 4 as well as in a horizontal form, as depicted in Figs. 5A to 5D.
• partitions formed by platforms 25 of the intermediate body 24 can be housed inside the device structure, horizontally or vertically.
• the attenuator device of the present invention can be designed with a plurality of acoustic chambers, wherein to do so only a combination and disposition of intermediate adapters 28 with the additional intermediate bodies are required provided that the disposition of the outlet channel 27 surrounded by the pluralities of connecting channels 26 formed by each intermediate body is maintained.
• said outlet channel 27, can be made in conjunction with said cover 21 , that is, said cover 21 and said outlet channel 27 are made into a single part.
• said components are independently fabricated and subsequently connected during the method of mounting the attenuator device 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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Citations (9)

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• 2013
  • 2013-07-30 BR BR102013019311-9A patent/BR102013019311B1/pt active IP Right Grant
• 2014
  • 2014-03-20 CN CN201420126146.6U patent/CN203867817U/zh not_active Expired - Lifetime
  • 2014-07-17 WO PCT/BR2014/000243 patent/WO2015013788A1/en not_active Ceased
  • 2014-07-17 TR TR2018/09786T patent/TR201809786T4/tr unknown
  • 2014-07-17 US US14/908,707 patent/US9752564B2/en active Active
  • 2014-07-17 EP EP14748095.8A patent/EP3027905B1/en active Active
  • 2014-07-17 JP JP2016530279A patent/JP6576923B2/ja active Active

Patent Citations (9)

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