(19)
(11)EP 3 047 145 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
27.11.2019 Bulletin 2019/48

(21)Application number: 14796400.1

(22)Date of filing:  18.09.2014
(51)Int. Cl.: 
F04B 39/00  (2006.01)
F04C 29/06  (2006.01)
(86)International application number:
PCT/BR2014/000340
(87)International publication number:
WO 2015/039204 (26.03.2015 Gazette  2015/12)

(54)

SUCTION MUFFLER FOR HERMETIC COMPRESSOR

AKUSTIKFILTER EINES HERMETISCHEN VERDICHTERS

FILTRE ACOUSTIQUE DE COMPRESSEUR HERMÉTIQUE


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 19.09.2013 BR 202013024030 U

(43)Date of publication of application:
27.07.2016 Bulletin 2016/30

(73)Proprietor: Embraco Indústria de Compressores e Soluções em Refrigeração Ltda.
89219-100 Joinville, SC (BR)

(72)Inventors:
  • RODRIGUES, Tadeu Tonheiro
    89219-300 Joinville - SC (BR)
  • WAJCZYK, Talita
    89218-430 Joinville - SC (BR)
  • FONSECA JÚNIOR, José Nilton
    15806-165 Catanduva - SP (BR)

(74)Representative: Soldatini, Andrea 
Società Italiana Brevetti S.p.A. Corso dei Tintori, 25
50122 Firenze
50122 Firenze (IT)


(56)References cited: : 
WO-A1-2005/075828
US-A- 4 582 468
US-B1- 6 280 153
WO-A1-2005/088126
US-A- 6 149 402
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    Field of the invention



    [0001] The present invention refers to a hermetic compressor, and more particularly, to a new constructive arrangement that optimizes the flow in a suction acoustic filter, which is usually arranged within the hermetic housing of the hermetic compressor.

    Background of the invention



    [0002] As it is known to those skilled technicians in the art, fluid compressors, and especially fluid compressors used in refrigeration systems comprise (among many other functional components) suction acoustic filters and discharge acoustic filters.

    [0003] In general, said acoustic filters comprise volumetric chambers arranged within the compressor hermetic housing, between the output and input of the compression cylinder and the inlet or outlet pipe of the compressor hermetic housing.

    [0004] The function and the functional principle of the acoustic filters are longtime known to the technicians skilled in the subject matter. It is known, therefore, that said acoustic filters - suction or discharge filters - aim to reduce the noise caused by the functional pulse of the compressor.

    [0005] One major difference between a discharge acoustic filter and a suction acoustic filter, in hermetic compressors, consists of the fact that the discharge acoustic filter has the volume thereof isolated from the inner environment of the hermetic housing of the compressor, while the suction acoustic filter has the input thereof in constant fluid communication with the interior of the compressor hermetic housing.

    [0006] It means that a discharge acoustic filter is directly connected - via specific pipes - to the compression cylinder, inside the hermetic housing, and to the cooling line, outside the compressor housing.

    [0007] Therefore, there is no important problem regarding the constructiveness of the inlet and / or outlet connections and / or joints of acoustic filters. This is because they have the inlets and / or outlets thereof welded to the pipes.

    [0008] The same does not occur with a suction acoustic filter, after all, this is directly connected only to the compression cylinder, the other end thereof (or pipe) arranged within the hermetic housing, and it may or may not be connected to the suction line of the cooling system, and usually there is no such direct connection. This is because it is preferred that the entire volume of the compressor hermetic housing is equalized with the pressure of said suction line of the cooling system.

    [0009] Therefore, there is a special care with the outlet pipe of the suction acoustic filters of hermetic compressors. In this sense, one can observe that the current state of the art provides fundamentally special constructions for pipes of suction acoustic filters.

    [0010] Document US 6.280.153 B1 describes, for example, an outlet pipe of a suction acoustic filter - pipe connected to the compression cylinder of the hermetic compressor - the constructivity thereof in steps aims to minimize the contact edges which may represent barriers to the suction flow.

    [0011] Document WO2005075828 A1 also describes, for example, an outlet pipe of a suction acoustic filter - pipe connected to the compression cylinder of the hermetic compressor - the constructivity thereof in duplicate aims to provide fluid flow to two suction valves.

    [0012] It is also known a constructivity of suction acoustic filter where the inlet pipe - pipe free of connection and freely arranged inside the hermetic compressor housing - has two suction holes. This embodiment is relatively conventional, and it can best be seen in Figure 1.

    [0013] As can be assessed by observing figure 1, two suction holes are provided in a same suction inlet pipe of a suction acoustic filter. The main objective of the embodiment illustrated in Figure 1 is to obtain, from the smallest possible dimensions (a single suction pipe) the greater possible suction capacity (double inlet).

    [0014] However, the greater suction capacity of the embodiment illustrated in Figure 1 is proportional to the diameter of the single pipe, rather than the number of inlet holes. Moreover, the fluid flow sucked by one of the holes can also impair the fluid flow sucked by the other hole.

    [0015] Thus, the present invention arises based on the general perspective (where it is noted a concerned with the outlet pipe greater than with the inlet pipe of the suction acoustic filters of hermetic compressors).

    Objectives of the invention



    [0016] Thus, it is one of the goals of this utility model application to provide a suction acoustic filter whose outlet pipe has more than one outlet hole, and each hole has its own pipe responsible for directing the flow of coolant to their respective valves.

    [0017] It is still one of the goals of this utility model application that the gas sucked into the cylinder through the suction holes has a similar amount of fluid, allowing a dynamic of the suction valves more homogeneous and synchronized with impacts on efficiency and noise through the reduction of the pulsation suction range.

    Summary of the invention



    [0018] These and other objectives of the invention are fully achieved through the constructive arrangement introduced in the acoustic filter of hermetic compressor now disclosed.

    [0019] According to the present invention, the suction acoustic filter is composed of at least one outlet pipe, which comprises at least two independent suction outlets, each independent suction outlets independently extending along the outlet pipe.

    [0020] Further, the independent suction outlets are spaced apart by at least one wall, and the tubular extensions of each independent suction outlets are isolated from each other by at least one vertical projection arranged along the outlet pipe.

    [0021] Preferably, at least one of the independent suction outlets (21) is curvilinear. Optionally, at least one of the independent suction outlets is straight.

    [0022] Most preferably, the outlet pipe can be projected from the top of the suction acoustic filter.

    [0023] In addition, and yet according to the present utility model application, it is noted that, preferably, the tubular extensions have lengths different from each other.

    Brief Description of the Drawings



    [0024] This invention will be described in detail based on the figures listed below, which:

    Figure 1 illustrates, in simplified form, the inlet pipe of a suction acoustic filter according to the current state of the art; and

    Figure 2 schematically illustrates a preferred embodiment of the constructive arrangement introduced in acoustic filter of hermetic compressor disclosed herein.


    Detailed Description of the Utility Model Application



    [0025] According to the objectives of the present invention, it was designed an acoustic filter of hermetic compressor whose main purpose is to provide more than one outlet hole in a single main pipe, in order to provide suction flows better distributed compared to that of the state of the art shown in Figure 1.

    [0026] Figure 2, as well as the enlarged detail thereof, illustrates a preferred embodiment of the acoustic filter of hermetic compressor according to the objectives of the present invention.

    [0027] The preferred embodiment illustrates a suction acoustic filter 1 comprised of a two-part body and preferably made of polymeric alloy (engineering plastic). The outlet pipe 2 (discharge of the muffler / suction inlet to the cylinder) and inlet pipe 5 (suction of the muffler) are vertically projected in the upper part of the two-part body.

    [0028] According to the scope of the present invention, whose focus comprises the outlet pipe 2, it is worth to mention that other functional details within the knowledge of the technician skilled on the subject matter are not explained in detail from the present detailed description.

    [0029] Still referring to Figure 2, it is noted that the aforementioned outlet pipe 2 comprises two independent suction outlets 21.

    [0030] Obviously, there could be more than two independent suction outlets 21 in a single outlet pipe 2, and this ratio is preferably defined in accordance with the number of suction valves (not shown) or according to the number of suction holes present in the valve-plate (not shown). Consequently, it can be stated that the preferred embodiment herein detailed is preferably suitable for a hermetic compressor integrated by two suction valves or two suction holes defined in the valve-plate (however, there are two suction ways).

    [0031] As best illustrated in the enlarged detail of figure 2, it is noted that the independent suction outlets 21 are spaced apart by at least one wall 4. The thickness of wall 4, that is, the actual distance between each independent suction outlets 21 is set according to the desired application and design, what is important in this case is the arrangement of said wall to form the two independent outlets.

    [0032] Each of the independent suction outlets 21 extends independently along the outlet pipe 2, forming a tubular extension 22.

    [0033] Since there are two independent suction outlets 21, it can be seen that there are two tubular extensions 22, which are isolated from each other by a vertical projection 3 that, starting from wall 4, is arranged along outlet pipe 2, and more particularly, until the final end of said tubular extensions 22.

    [0034] It is worth mentioning that, optionally, tubular extensions 22 may have lengths and diameters different from each other. This is because the dynamics of the valve is influenced due to the length and diameter of the tubes. These values can be adjusted to obtain the best performance with respect to the thermodynamic efficiency and the acoustics.

    [0035] Further, independent suction outlets 21 may be curvilinear or straight, the setting between one possibility or another is based on additional conventional aspects of the hermetic compressor itself (not shown).

    [0036] The existence of independent suction outlet 21 on a single outlet pipe 2 (discharge pipe of the muffler / suction pipe to the cylinder) allows balancing the amount of fluid discharged by suction acoustic filter 1, thereby enabling similar movement of the suction valves (not shown), which ends up resulting in performance and pulse gains of the hermetic compressor.

    [0037] Having described an example of preferred embodiment of the object of this invention, it should be understood that the scope thereof encompasses other possible variations, which are solely limited by the wording of the appended claims.


    Claims

    1. Hermetic compressor comprising a suction acoustic filter (1) integrated by at least one outlet pipe (2);
    wherein the outlet pipe (2) comprises at least two independent suction outlets (21) adjacently disposed;
    the independent suction outlets (21) are spaced apart by at least one wall (4);
    the outlet pipe (2) being connected to a valve-plate, wherein each independent suction outlet (21) is associated to a respective suction hole, each suction hole being regulated by a respective suction valve; characterized by the fact that
    each independent suction outlet (21) independently extends along the outlet pipe (2), forming a tubular extension (22); and
    the tubular extensions (22) of the independent suction outlets (21) are isolated from each other by at least one vertical projection (3) arranged along the outlet pipe (2).
     
    2. Hermetic compressor comprising a suction acoustic filter according to claim 1, characterized by the fact that at least one of the independent suction outlets (21) is curvilinear.
     
    3. Hermetic compressor comprising a suction acoustic filter according to claim 1, characterized by the fact that at least one of the independent suction outlets (21) is straight.
     
    4. Hermetic compressor comprising a suction acoustic filter according to claim 1, characterized by the fact that outlet pipe (2) is projected from the top of suction acoustic filter (1).
     
    5. Hermetic compressor comprising a suction acoustic filter according to claim 1, characterized by the fact that the tubular extensions (22) have lengths different from each other.
     
    6. Hermetic compressor comprising a suction acoustic filter according to claim 1, characterized by the fact that the tubular extensions (22) have diameters different from each other.
     


    Ansprüche

    1. Hermetischer Kompressor, der einen Saug-Akustikfilter (1) enthält, der durch wenigstens ein Auslassrohr (2) integriert ist;
    wobei das Auslassrohr (2) wenigstens zwei unabhängige Saugauslässe (21) enthält, die benachbart angeordnet sind;
    die unabhängigen Saugauslässe (21) durch wenigstens eine Wand (4) voneinander beabstandet sind;
    das Auslassrohr (2) mit einer Ventilplatte verbunden ist,
    wobei jeder unabhängige Saugauslass (21) mit einem entsprechenden Saugloch verbunden ist, wobei jedes Saugloch durch ein entsprechendes Saugventil geregelt wird; gekennzeichnet durch die Tatsache, dass
    jeder unabhängige Saugauslass (21) sich unabhängig durch das Auslassrohr (2) erstreckt, wobei eine rohrartige Verlängerung (22) gebildet wird; und
    die rohrartigen Verlängerungen (22) der unabhängigen Saugauslässe (21) voneinander durch wenigstens einen Vorsprung (3) isoliert sind, der längs des Auslassrohres (2) angeordnet ist.
     
    2. Hermetischer Kompressor, der einen Saug-Akustikfilter enthält, nach Anspruch 1, gekennzeichnet durch die Tatsache, dass wenigstens einer der unabhängigen Saugauslässe (21) kurvenförmig ist.
     
    3. Hermetischer Kompressor, der einen Saug-Akustikfilter enthält, nach Anspruch 1, gekennzeichnet durch die Tatsache, dass wenigstens einer der unabhängigen Saugauslässe (21) gerade ist.
     
    4. Hermetischer Kompressor, der einen Saug-Akustikfilter enthält, nach Anspruch 1, gekennzeichnet durch die Tatsache, dass das Auslassrohr (2) von der Oberseite des Saug-Akustikfilters (1) vorsteht.
     
    5. Hermetischer Kompressor, der einen Saug-Akustikfilter enthält, nach Anspruch 1, gekennzeichnet durch die Tatsache, dass die rohrartigen Verlängerungen (22) voneinander verschiedene Längen haben.
     
    6. Hermetischer Kompressor, der einen Saug-Akustikfilter enthält, nach Anspruch 1, gekennzeichnet durch die Tatsache, dass die rohrartigen Verlängerungen (22) voneinander verschiedene Durchmesser haben.
     


    Revendications

    1. Compresseur hermétique comprenant un filtre acoustique d'aspiration (1) intégré par au moins un conduit de sortie (2) ;
    dans lequel le conduit de sortie (2) comprend au moins deux sorties d'aspiration indépendantes (21) disposées de façon adjacente ;
    les sorties d'aspiration indépendantes (21) étant séparées l'une de l'autre par au moins une paroi (4) ;
    le conduit de sortie étant relié à une plaque de valves, dans lequel chaque sortie d'aspiration (21) est associée à un orifice d'aspiration, chaque orifice d'aspiration étant régulé par une valve d'aspiration respective ; caractérisé par le fait que
    chaque sortie d'aspiration indépendante (21) s'étend indépendamment le long du conduit de sortie (2), formant une extension tubulaire (22) ; et que
    les extensions tubulaires (22) des sorties d'aspiration indépendantes (21) sont isolées les unes des autres par au moins une projection verticale (3) agencée le long du conduit de sortie (2).
     
    2. Compresseur hermétique comprenant un filtre acoustique d'aspiration selon la revendication 1, caractérisé en ce qu'au moins une des sorties d'aspiration indépendantes (21) est curviligne.
     
    3. Compresseur hermétique comprenant un filtre acoustique d'aspiration selon la revendication 1, caractérisé en ce qu'au moins une des sorties d'aspiration indépendantes (21) est rectiligne.
     
    4. Compresseur hermétique comprenant un filtre acoustique d'aspiration selon la revendication 1, caractérisé en ce que le conduit de sortie (2) fait saillie à partir du sommet du filtre acoustique d'aspiration (1).
     
    5. Compresseur hermétique comprenant un filtre acoustique d'aspiration selon la revendication 1, caractérisé en ce que les extensions tubulaires (22) ont des longueurs différentes les unes des autres.
     
    6. Compresseur hermétique comprenant un filtre acoustique d'aspiration selon la revendication 1, caractérisé par le fait que les extensions tubulaires (22) ont des diamètres différents les uns des autres.
     




    Drawing






    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description