JP2009542949A - Acoustic muffler for cooling compressor - Google Patents

Abstract

  The acoustic muffler has a hollow body (10) that defines at least one muffler chamber (11) that supports a gas suction duct (20) and a gas discharge duct (30), and a cross-sectional shape of the gas flow path (P). A cavity defining the gas flow path (P) provided with at least one impurity filter (40) having a mesh surface (41) that is larger than what is defined and protrudes on at least one side of the cross section. At least one component defined by a body (10), a gas suction duct (20) and a gas discharge duct (30).

Description

  The present invention relates generally to the structure of an acoustic muffler for a hermetic cooling compressor of the type that retains particulate matter contained in a gas stream that has flowed into the suction section of the compressor.

  The hermetic compressor of the cooling system is usually provided with an acoustic muffler (acoustic filter or suction muffler) located inside the shell and has a suction part for guiding gas from the suction line to the suction valve.

  Such components have several functions that are important for proper operation of the compressor, such as gas transmission, acoustic suppression, and in some cases, thermal insulation of gas drawn into the interior of the cylinder.

  An intake acoustic muffler is generally configured to form a trajectory for a refrigerant gas flow flowing into a compression chamber of a cooling compressor from an intake line of a cooling system to which the compressor is coupled, and the movement of the refrigerant gas flow is performed. Generate minimal noise.

  Hermetic compressors utilized in refrigeration systems are frequently damaged to internal components due to the flow of solid particles into those internal components. Such particles originate from the cooling circuit and arise either as an inefficient cleaning action or due to contamination during some stages of component manufacturing and cooling system assembly. These particles are carried by the refrigerant gas stream and enter the compressor. Hard solid particles such as chips from the machining process can cause damage to the intake valve before breaking, rendering the compressor inoperable. Even soft solid particles such as fabric fibers can adhere to the surface of the intake or discharge valve, impairing its complete blockage and reducing the efficiency of the compressor.

  For the purpose of preventing the problems mentioned above and even other problems that may be caused by the presence of solid contaminants in the cooling circuit and mainly inside the compressor, for example US Pat. No. 6,715,582 and US Pat. No. 4,911,619. As presented in the specification, some manufacturers use metal flat impurity filters that are mounted upstream of the intake valve in view of the refrigerant gas pump flow. The impurity filter is obtained from a twisted wire mesh (wire mesh) cut to form a flat geometric figure. FIG. 1 shows an example of a known structure of a flat impurity filter. Its function is to hold the solid particles and prevent them from reaching the intake valve. FIG. 2 shows the application of the known conventional impurity filter at different positions in the suction muffler.

  A characteristic unique to the use of filters made from wire mesh is the load loss caused by the refrigerant gas flow. This load loss occurs due to the resistance experienced by the gas flow, as well as the aerodynamic friction that exists between the refrigerant gas and the mesh metal wire, as a significant reduction in the flow area through the impurity filter.

  The above-mentioned characteristics are mainly due to either the gas suction or discharge duct in the suction muffler, as shown in the illustrated example, or between the inner chambers when the suction muffler has two or more inner chambers. When the impurity filter needs to be applied in a very narrow area, such as a flow path defined for communication, it greatly affects the planning of the components of the suction system in the compressor. The reduced flow path area unique to impurity filters requires the placement of a sub-chamber in a narrow area so as to provide a flow path for the refrigerant gas flow that is necessary to allow the application of larger impurity filters. This requirement results in more complex planning and greater difficulty to manufacture each impurity filter part. If the suction muffler is applied directly to one of the gas suction or discharge ducts, or if the suction muffler has more than one volume, in the flow path between the volumes, there is a restriction on the gas flow to be sucked An alternative to avoiding is to increase the diameter or flow area respectively. However, this alternative means that either the larger diameter gas suction or discharge duct, or the flow path between the larger area suction muffler volumes, is less restrictive to the acoustic energy resulting from the refrigerant gas compression operation. This causes a decrease in the acoustic performance of the suction muffler because it travels in a path opposite to the flow of the refrigerant gas.

  It is an object of the present invention to provide an acoustic muffler that overcomes the above-mentioned deficiencies related to the efficient retention of impurities contained in the refrigerant gas flow through the muffler without harm to the efficiency of the suction muffler as an acoustic filter.

  A more specific object of the present invention is to provide the muffler described above that does not require any changes in the structural aspects of the inhalation muffler.

  Another object of the present invention is to provide a muffler of the type described above that is easy to obtain and low in cost.

  The above-mentioned purpose is to support a gas suction duct having a suction opening outside the muffler chamber and a discharge opening inside the muffler chamber, and a gas discharge duct having a suction opening inside the muffler chamber and a discharge opening outside the muffler chamber. A cavity body defining at least one muffler chamber, and at least a mesh surface that is mesh-shaped and that is larger than that defined by the cross-sectional shape of the gas flow path and protrudes on at least one side of the cross-section. Achieved by providing an acoustic muffler for a cooling compressor comprising a cavity body, at least one part defined by a gas inlet duct and a gas outlet duct, defining a gas flow path provided with one impurity filter. The

  The present invention will now be described with reference to the accompanying drawings.

1 schematically shows a front view of an impurity filter structure for an acoustic muffler constructed according to the prior art. 1 schematically shows a side view of an impurity filter structure for an acoustic muffler constructed according to the prior art. 1 schematically shows a partial view of a refrigerant gas suction area in a cooling compressor, in particular showing a suction muffler constructed according to the prior art and with an arrangement of impurity filters as illustrated in FIGS. 1a and 1b The direction of the refrigerant gas flow flowing into the compression chamber is also shown. 1 schematically shows a front view of an impurity filter structure for an acoustic muffler constructed in accordance with the present invention. 1 schematically shows a side view of an impurity filter structure for an acoustic muffler constructed in accordance with the present invention. Fig. 2 schematically shows a partial view of a refrigerant gas intake area in a cooling compressor, in particular showing an intake muffler constructed according to the invention and with an arrangement of impurity filters as illustrated in Figs. 3a and 3b The region where the impurity filter is attached to the acoustic muffler is also shown. 5 schematically shows a front view of a gas suction duct of an acoustic muffler that supports the impurity filter of the present invention as illustrated in FIG.

  According to the drawings, the present invention relates to the piston 3 reciprocating in the compression chamber 4 defined in the cylinder 2 between the tip of the piston 3 and the valve plate 5 fixed to the end of the cylinder 2. Provided is an acoustic muffler attached to the inside of a closed shell 1 of a cooling compressor including a motor compressor including the cylinder 2 to be accommodated. The compressor also supports an electric motor (not shown) that drives the piston 3 during the refrigerant gas intake and compression strokes of the cooling system to which the compressor is coupled. The refrigerant gas flows into the compression chamber 4 from a suction line of a cooling system that includes a suction tube 6 that is connected to a compressor and that is disposed through the shell 1 and opens into the suction muffler. The valve plate 5 defines a suction orifice 5a and a discharge orifice (not shown), and supports the suction valve 5b and a discharge valve (not shown).

  The acoustic muffler includes a hollow body 10 that defines at least one muffler chamber 11, a gas suction duct 20 having a suction opening 21 outside the muffler chamber 11 and a discharge opening 22 inside the muffler chamber 11, and the inside of the muffler chamber 11. And a gas discharge duct 30 having a discharge opening 32 outside the muffler chamber 11. The acoustic muffler receives the refrigerant gas reaching from the suction tube 6 through the suction opening 21 of the gas suction duct 20 of the suction muffler, and the inside of the compression chamber 4 through the discharge opening 32 of the gas discharge duct 30 of the suction muffler. To guide the refrigerant gas. In the illustrated structure, the discharge opening 32 of the gas discharge duct 30 guides the refrigerant gas directly into the compression chamber 4.

  A conventional acoustic muffler has one, two, or more impurity filters disposed in the gas flow path through the interior of the acoustic muffler from its inlet to outlet. In the conventional acoustic muffler illustrated in FIG. 2, a first flat impurity filter 7 provided in a gas flow path P defined in the gas suction duct 20 adjacent to the suction opening 21, and the acoustic muffler. And the second impurity filter 8 provided in the gas flow path P defined adjacent to the discharge opening 32 of the gas discharge duct 30 of the hollow body 10. The impurity filter arrangement in such an acoustic muffler has the above-mentioned defects.

  The present invention builds a solution that overcomes the difficulties associated with utilizing a flat impurity filter of the type that is also used in conventional structures but also uses a wire mesh.

  According to the present invention, at least one part defined by the cavity body 10, the gas suction duct 20 and the gas discharge duct 30 is constructed in accordance with the present invention and is defined by the cross-sectional shape of the gas flow path P. The gas flow path P is defined to be provided with an impurity filter 40 having a mesh surface 41 having a mesh surface 41 that is substantially larger than and protrudes on at least one side of a plane including the cross section of the gas flow path P.

  The present invention is a concept of a volumetric and metallic impurity filter 40 having a mesh surface 41 formed to have a three-dimensional geometric shape that can be changed according to the shape state of the place where the impurity filter 40 is installed. Is used.

  3a, 3b, 4 and 5, the impurity filter 40 having a hemispherical shape applied to either the gas suction duct 20 or the gas discharge duct 30 of the acoustic muffler cavity body 10 is provided. However, it should be understood that the concepts presented here are also spheres, hemispheres, cubes, parallelepipeds, pyramids, cylinders, cones, pyramids or cones, or 3 Other spatial geometries may be used, such as any other shape that characterizes the dimensional shape. The impurity filter may be provided in any part of the acoustic muffler along a path along which the refrigerant gas inside the acoustic muffler travels upstream of the suction valve.

  According to the present invention, the mesh surface 41 of the impurity filter 40 is defined by an end 42 having a shape that matches that of the cross section of the gas flow path P, and a mesh portion in the form of a generally spherical cap in the illustrated structure. It has a tubular shape with an obstruction opposite end 43. Nevertheless, the opposite end 43 can of course have any shape, such as being linear and arranged parallel to or inclined with respect to a plane including the cross section of the gas flow path P. That is.

  The end 42 of the mesh surface 41 defines a peripheral end for mounting the impurity filter 40 in the gas flow path P in which the mesh surface 41 is provided, and occupies the volume of a part from which the impurity filter 40 protrudes. For example, the remainder of the mesh surface 41 protrudes toward the flow path of the refrigerant gas flow.

  According to the present invention, at least one of the respective suction and discharge openings 21, 22, 31, 32 of the gas suction duct 20 and the gas discharge duct 30 is at least one of each impurity filter 40 configured according to the present invention. Support. However, in order to place the impurity filter in the gas flow path P of the acoustic muffler, a part of the gas flow path P supports the impurity filter having a conventional structure and / or the impurity filter 40 configured according to the present invention. Of course, other solutions are possible.

  In the illustrated structure, the gas suction duct 20 includes, for example, an impurity filter 40 provided adjacent to the suction opening 21 at the outer end portion thereof, while the gas discharge duct 30 includes the discharge openings 32 respectively. Impurity filter 40 provided adjacent to. Nevertheless, it will be appreciated that other configurations are possible, such as the installation of one or more impurity filters 40 in one or both of the gas inlet duct 20 and the gas outlet duct 30. Furthermore, as a matter of course, the acoustic muffler can support only one impurity filter 40 at the gas inlet 31 of the gas discharge duct 30, for example.

  Although not shown, the present invention can also be applied to a gas discharge acoustic muffler.

  The structure of the impurity filter 40 according to the present invention increases the size of the region where the impurity filter 40 is attached to the acoustic muffler in order to increase the filtering orifice of the wire mesh used in the manufacture of the impurity filter 40 or to compensate for the influence of load loss. It has the advantage of obtaining a flow path area for the refrigerant gas without having to increase the thickness. The surface area of the impurity filter 40 of the present invention is significantly larger than the surface area of known conventional flat impurity filters, which can compensate for the load loss effect caused by the reduction of the flow area in the planar impurity filter. And

  According to the implementation method of the present invention, the impurity filter 40 is a region of the end portion 42 of the impurity filter 40 to which the fixing means 50 is attached via the fixing means 50 which is the shape of the deformed peripheral portion of the gas flow path P Is attached to the gas flow path P in which it is provided. According to the illustrated structural shape, the gas flow path P that receives and attaches the impurity filter 40 is provided with an axial or radial protrusion, which is heated after the impurity filter 40 is placed, for example. And are attached to the respective gas flow paths P.

  According to the present invention, the fixing means 50 is at least one holding projection provided on one component of the gas suction duct 20 and the gas discharge duct 30 so as to be fixed to an adjacent portion of the end portion 42 of the impurity filter 40. 51 is provided. For example, the holding protrusion 51 is plastically deformed by thermal deformation at the end portion 42 of the impurity filter 40.

  In the illustrated solution, the gas suction opening 21 of the gas suction duct 20 and / or the gas suction port 31 of the gas discharge duct 30 are fixed to an adjacent portion of the end 42 of the impurity filter 40 by thermal deformation. A plurality of holding projections 51 are provided. Although the present invention may be fixed by bending a plurality of holding projections 51, it should be understood that the fixing is performed on the gas inlet 21 of the gas inlet duct 20 and the gas inlet 31 of the gas inlet duct 30. It can be obtained from a single protrusion that surrounds the shape of the end of each part.

  According to the figure, the gas inlet 21 of the gas inlet duct 20 is fixed to the end 42 of the impurity filter 40 configured according to the present invention before the holding projection 51 of the gas inlet duct 20 is deformed. And a peripheral flange 21 a surrounding the peripheral end of the gas inlet 21.

  In this structure, after the impurity filters 40 are arranged in the respective gas flow paths P, the peripheral portion of the gas flow path P in the acoustic muffler region overlaps the adjacent portion of the end portion 42 of the impurity filter 40. Formed. In the preferred method of implementing the invention, the deformation is performed upstream of the gas flow path P.

  In a structure in which two or more impurity filters are provided in the same gas flow path P, for example, for a flat impurity filter configured according to the prior art and an impurity filter configured according to the present invention, The deformation of the shape portion is made by attaching the filters to each other and adjacent wall portions of the acoustic muffler in which the gas flow path P is defined, and adjacent to the respective shapes of the impurity filters mounted in the gas flow path P. The ends should be fixed.

  While the structure of the acoustic muffler having the impurity filter 40 in the gas suction duct 20 and the gas discharge duct 30 is illustrated, it should be understood that the acoustic muffler is, for example, 1 at the gas suction port 31 of the gas discharge duct 30. Only one impurity filter 40 can be provided.

  While the invention has been described and illustrated for an acoustic muffler having a hollow body 10 that internally defines only one muffler chamber 11, it will be appreciated that in the case of an acoustic muffler having two or more muffler chambers. The partition wall having the gas flow path P can fix the impurity filter constructed according to the prior art or the present invention.

Claims (11)

  A gas suction duct (20) having a suction opening (21) outside the muffler chamber (11) and a discharge opening (22) inside the muffler chamber (11); a suction opening (31) inside the muffler chamber (11); A hollow body (10) defining at least one muffler chamber (11) supporting a gas discharge duct (30) having a discharge opening (32) outside the muffler chamber (11); and a mesh-like impurity filter ( At least one part defined by a hollow body (10), a gas suction duct (20) and a gas discharge duct (30), defining a gas flow path (P) provided with 7, 8, 40). An acoustic muffler for a cooling compressor, wherein at least one impurity filter (40) has a cross-sectional shape of the gas flow path (P). Characterized by having a protruding on at least one side has a mesh surface of larger and the cross-section than those defined (41) Te, the acoustic muffler.   The acoustic muffler according to claim 1, wherein the mesh surface (41) of the impurity filter (40) protrudes toward one side of the cross section of the gas flow path (P) toward the refrigerant gas flow. .   The mesh surface (41) of the impurity filter (40) has a tubular shape having an end portion (42) having a shape matching that of the cross section of the gas flow path (P) and an end portion (43) on the opposite side of the blockage. The acoustic muffler according to claim 2, comprising:   4. The acoustic muffler according to claim 3, wherein the opposite end (43) of the impurity filter (40) is defined by a mesh portion in the form of a substantially spherical cap.   The gas suction duct (20) according to claim 1, characterized in that it comprises at least one impurity filter (40) provided adjacent to the suction opening (21) of the gas suction duct (20). Acoustic muffler.   The gas discharge duct (30) according to claim 1, characterized in that it comprises at least one impurity filter (40) provided adjacent to the suction opening (31) of the gas discharge duct (30). Acoustic muffler.   The acoustic muffler according to claim 1, characterized in that the mesh surface (41) is made of a metallic material.   2. The acoustic muffler according to claim 1, further comprising fixing means (50) for fixing at least one impurity filter (7, 8, 40) in each gas flow path (P).   The fixing means (50) is provided at least in one part of the gas suction duct (20) and the gas discharge duct (30) so as to be fixed to an adjacent portion of the end portion (42) of the impurity filter (40). Acoustic muffler according to claim 8, characterized in that it comprises one holding projection (51).   10. The acoustic muffler according to claim 9, wherein the holding projection (51) is plastically deformable at the end (42) of the impurity filter (40).   The acoustic muffler according to claim 10, characterized in that the holding projection (51) is thermally deformable.

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