JP2008202436A - Silencer for supercharger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a silencer for a supercharger of a simple structure with a small number of components not deteriorating silencing performance. <P>SOLUTION: This silencer provided on an air inlet of an exhaust turbocharger is provided with a punching metal first partition circular plate having a suction hole concentric with the air inlet formed at a center thereof and a spacer part formed with bending an outer circumference part, and a punching metal second partition circular plate 35 having the suction hole concentric with the air inlet formed at a center thereof and a spacer part formed with bending an outer circumference part. The first partition circular plates and the second partition circular plates make pairs, and voids are formed between the first partition circular plates and the second partition circular plates by the spacer parts. Closed spaces partitioned by the first partition circular plates and the second partition circular plates and open spaces communicating to the suction hole at inner circumferences are alternately formed. The closed spaces are used as sound absorbing layers filled with sound absorbing material, and the open spaces are used as suction channels establishing communication between an outside and the suction hole. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a silencer for a supercharger provided at an air intake port of an exhaust turbine supercharger provided in an internal combustion engine such as a large diesel engine.

  An internal combustion engine, such as a large diesel engine, is equipped with an exhaust turbine supercharger to improve combustion efficiency. In addition, a silencer is provided at the air inlet in order to mute noise such as rotation noise of the compressor wheel.

  FIG. 4 shows an exhaust turbine supercharger provided with a silencer.

  In FIG. 4, 1 indicates an exhaust turbine supercharger, and 2 indicates a silencer.

  The exhaust turbine supercharger 1 includes an exhaust turbine 4 provided on one side of the bearing portion 3 and a compressor 5 provided on the other side.

  A turbine impeller 7 is attached to one end of a rotating shaft 6 rotatably supported by the bearing portion 3, and a compressor impeller 8 is attached to the other end. The turbine impeller 7 is accommodated in a turbine housing 9. The compressor wheel 8 is housed in a compressor housing 10. The rotating shaft 6, the turbine impeller 7, and the turbine housing 9 constitute the exhaust turbine 4, and the rotating shaft 6, the compressor impeller 8, and the compressor housing 10 constitute the compressor 5.

  Exhaust gas flows into the turbine housing 9 from the exhaust gas inlet 12, rotates the turbine impeller 7 by exhaust energy, and the expanded exhaust gas is exhausted from the exhaust port 13. The compressor wheel 8 is rotated by the turbine wheel 7 via the rotating shaft 6. The rotation of the compressor wheel 8 causes air to be sucked from the suction port 14 and compressed in the process of flowing through the compressor housing 10, and the compressed air is discharged from the discharge hole (not shown) into the combustion chamber of the diesel engine. Is done.

  Since the compressor wheel 8 is rotated at a high speed, when the exhaust turbine supercharger 1 is driven, a rotating sound or intake sound of the compressor wheel 8 is emitted as noise. The silencer 2 is provided at the suction port 14 of the compressor housing 10 to absorb this noise and suppress the noise released to the outside.

  A conventional silencer 2 will be described with reference to FIG.

  The silencer 2 absorbs a required number of sound absorbing disks 18 by means of an aluminum cast inner disk 16 attached to the compressor housing 10 and an aluminum cast outer disk 17 paired with the inner disk 16. A configuration is provided in which a suction path 19 is formed between the disks 18 and 18 at predetermined intervals so that a dust-proof filter 21 is provided so as to surround the outer disk 17.

  The sound absorbing disk 18 is obtained by encapsulating a fibrous soundproofing material 24 with two punching metals 23 each having a suction hole 22 formed in the center, and the soundproofing material 24 thus encapsulated in the punching metal 23. On the other hand, rivets 25 are driven at a required interval and distribution so as not to move. The sound absorbing disk 18 is fixed to the inner disk 16 and the outer disk 17 by a shaft 26 that passes through the inner disk 16, the outer disk 17, and the sound absorbing disk 18. The shaft 26 is provided at a required interval in the circumferential direction, for example, at a position equally divided into six circumferences, and the sound absorption is formed on the shaft 26 so as to form the suction path 19 between the sound absorption disks 18, 18. A collar 27 is fitted between each disk 18.

  When the exhaust turbine supercharger 1 is driven and the compressor 5 sucks air from the exhaust gas inlet 12, air is sucked from the periphery of the filter 21, passes through the suction passage 19, and passes through the suction hole 22. Then, the air is sucked from the suction port 14.

  The noise emitted from the compressor 5 is absorbed by the soundproof material 24 through the holes of the punching metal 23 in the process of passing through the suction passage 19, and the noise emitted to the outside is suppressed.

  In the conventional silencer 2 described above, the inner disk 16 and the outer disk 17, which are cast products, a required number of sound absorbing disks 18, a shaft 26 for fixing the sound absorbing disks 18, the sound absorbing disks 18, It is composed of a collar 27 for holding the suction passage 19 between 18 and a rivet for fixing the soundproofing material 24, etc. The structure is complicated, the number of parts is large, and the cost is high. .

Japanese Patent Laying-Open No. 2005-214048

  In view of such circumstances, the present invention provides a silencer for a supercharger that has a simple configuration, has a small number of parts, is low in cost, and does not impair the silencing performance.

  The present invention is a silencer for a supercharger provided at an air intake port of an exhaust turbine supercharger, wherein an air intake hole concentric with the air intake port is formed in the center, and an outer peripheral portion is bent to form a spacer portion. A punching metal first partition disk formed with a punching metal, and a second punching metal made of a punching metal having a spacer portion formed by bending the outer peripheral portion with the air inlet concentric with the air inlet at the center. A partition disk, and the first partition disk positioned on the air inlet side and the second partition disk positioned on the anti-air inlet side are paired, and the first partition disk, The second partition disk is required to be paired and a gap is formed between the first partition disk and the second partition disk by the spacer portion, and the first partition disk, the pair The inner periphery of the two-partition disk is joined and partitioned by the first partition disk and the second partition disk. Chain spaces and open spaces whose inner circumferences communicate with the intake holes are alternately formed, the closed spaces are sound absorbing layers filled with a sound absorbing material, and the open spaces are suction flows that communicate the outside and the intake holes. It is related to the silencer of the supercharger used as the road.

  Further, according to the present invention, at least the peripheral portion of the intake hole of the first partition disk and the second partition disk is a curved surface facing the air suction port, and the curved surface of the first partition disk The radius of curvature is related to the silencer of the supercharger which is larger than the radius of curvature of the curved surface of the second partition disk so that the inner peripheral edges of the first partition disk and the second partition disk are joined. The cross section of the sound absorbing layer is a blade cross-sectional shape that is curved so that the peripheral portion of the intake hole faces the air intake port, the cross section of the intake flow path is maintained at substantially equal intervals, and the peripheral portion of the intake hole is the The present invention relates to a silencer of a supercharger that is curved toward an air intake port, and further, an inner partition plate having a hole communicating with the intake hole is disposed at a compressor side end, and the intake air side is disposed at an anti-compressor side end. An outer lid that closes the hole is disposed, the outer lid, the first partition disk, and the second partition. Plate, the inner partition plate is according to the silencer of the turbocharger, which is integrated by the fastening bolts passing through.

  According to the present invention, there is provided a silencer for a supercharger provided at an air intake port of an exhaust turbine supercharger, wherein an air intake hole concentric with the air intake port is formed at a center, and an outer peripheral portion is bent. A punching metal first partition disk having a spacer portion formed therein, and a punching metal made by punching metal having a spacer portion formed by bending the outer peripheral portion in the center and the air inlet being concentric with the air suction port. A second partition disk, and the first partition disk positioned on the air inlet side and the second partition disk positioned on the anti-air inlet side are paired, and the first partition circle Plate, the second partition disk is required to be paired, and a gap is formed between the first partition disk and the second partition disk by the spacer portion, and the first partition disk to be paired, The inner peripheral edge of the second partition disk is joined and partitioned by the first partition disk and the second partition disk. Closed space and an open space whose inner periphery communicates with the intake hole are alternately formed, the closed space is a sound absorbing layer filled with a sound absorbing material, and the open space is an intake that communicates between the outside and the intake hole Since the flow path is used, the sound absorbing layer and the suction flow path of the silencer can be formed only of a punched metal molded product, so that the number of parts can be reduced, the manufacturing cost of the parts themselves can be reduced, and the assembly can be easily performed.

  According to the invention, at least the peripheral portions of the intake holes of the first partition disk and the second partition disk are curved surfaces facing the air suction ports, respectively, and the first partition disk Since the curvature radius of the curved surface is larger than the curvature radius of the curved surface of the second partition disk so that the inner peripheral edges of the first partition disk and the second partition disk are joined, the first partition disk The sound absorbing layer and the suction channel can be formed without complicated processing of the second partition disk.

  Further, according to the present invention, the cross section of the sound absorbing layer is a blade cross-sectional shape that is curved so that the peripheral portion of the suction hole faces the air suction port, and the cross section of the suction flow path maintains a substantially equal interval, Since the peripheral portion of the air intake hole is curved so as to face the air intake port, noise is emitted to the outside through the curved flow path, so that the sound absorption efficiency is improved and when passing through the intake flow path Pressure loss is reduced.

  Further, according to the present invention, an inner partition plate having a hole communicating with the suction hole is disposed at the compressor side end, and an outer lid for closing the intake hole is disposed at the non-compressor side end. Since the first partition disk, the second partition disk, and the inner partition plate are integrated by a fastening bolt that penetrates, the first partition disk and the second partition are easy to integrate. Excellent effect that the disk can be easily increased or decreased.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  In FIG. 1, the same components as those shown in FIG.

  A silencer 30 is attached to the suction port 14 of the compressor housing 10.

  The silencer 30 will be described. In FIG. 1, the left side is the inside and the right side is the outside.

  The silencer 30 includes a pair of inner partition discs 33, a required number of first partition discs 34 formed of punching metal, and a pair of first partition discs 34 between the connecting flange 31 and the outer lid 32. A two-partition disk 35 and an inner lid 36 are held. As a material used for the connection flange 31, the outer lid 32, the inner partition disk 33, the first partition disk 34, the second partition disk 35, and the inner lid 36, no surface treatment is required. Further, a stainless steel plate having corrosion resistance is preferable.

  The connecting flange 31 has a substantially ring shape, a center portion is constricted, an inner flange 31a is formed at the inner end, and an outer flange 31b is formed at the outer end.

  The first partition disk 34 has a suction hole 22 concentric with the suction port 14 at the center thereof, and the periphery of the suction hole 22 is gently curved so that the suction hole 22 protrudes toward the compressor 5 side. The outer peripheral portion 34a of the first partition disk 34 is bent to the anti-compressor 5 side, and the outermost peripheral portion is parallel to the peripheral portion of the first partition disk 34 so as to form a predetermined interval. It has been folded back.

  The second partition disk 35 has a shape substantially similar to the first partition disk 34, and the suction hole 22 is formed in the center portion, and the suction hole 22 is formed around the suction hole 22. It is gently curved so as to protrude toward the compressor 5 side. Further, the outer peripheral portion 35a of the second partition disk 35 is bent to the anti-compressor 5 side, and the outermost peripheral portion is parallel to the peripheral portion of the second partition disk 35 so as to form a predetermined interval. It has been folded back. In the drawing, the outer peripheral portion 34a and the outer peripheral portion 35a are formed at the same height.

  The outer peripheral portion 34a and the outer peripheral portion 35a function as spacer portions that form a gap between the first partition disk 34 and the second partition disk 35, respectively. The heights of the outer peripheral portion 34a and the outer peripheral portion 35a are determined according to the performance required for the silencer of the turbocharger, such as the silencing performance and the intake efficiency, and are not necessarily the same.

  The radius of curvature of the periphery of the suction hole 22 of the second partition disk 35 is smaller than the radius of curvature of the periphery of the suction hole 22 of the first partition disk 34.

  The basic shape of the inner partition disk 33 is the same as that of the first partition disk 34, but an annular ridge 33b is formed in the periphery of the intake hole 22, and the ridge 33b causes the compressor to A gap 37 is formed between the end face of the housing 10.

  The inner lid 36 has a substantially spherical or substantially frustoconical raised portion 36b projecting toward the compressor 5 at the center, and the curved portion extending from the peripheral portion of the inner lid 36 to the raised portion 36b is It has substantially the same shape as the curved portion of the first partition disk 34. The inner lid 36 is formed with an outer peripheral portion 36a similar to the outer peripheral portion 34a.

  The outer lid 32 is formed of a plate material without punching holes, and the cross-sectional shape thereof is substantially similar to the inner lid 36 except for the peripheral portion.

  The outer flange 31b, the inner partition disk 33, the second partition disk 35, the first partition disk 34 and the second partition disk 35 are paired as required, and the inner lid 36, The outer lid 32 is superposed in sequence, and the fastening bolt 38 is passed through the outer lid 32 to the outer flange 31b and fixed.

  In a state in which the inner partition disk 33 and the second partition disk 35 are in close contact with each other, a predetermined interval is maintained by the outer peripheral portion 35a and the inner peripheral edges are joined to each other to have a blade-shaped closed cross section. A sound absorbing material holding space 39 is formed. In a state where the first partition disk 34 and the second partition disk 35 are in close contact with each other, a predetermined gap is maintained by the outer peripheral portion 34a, and the first partition disk 34 and the second partition disk 34 are maintained. When the sound absorbing material holding space 40 having a wing-shaped closed cross section is partitioned between the discs 35 and the inner lid 36 and the outer lid 32 are in close contact with each other, a predetermined gap is maintained by the outer peripheral portion 36a. In addition, a sound-absorbing material holding space 41 having a closed cross section with a central portion bulging in a spherical shape on the left (in the compressor direction) is formed between the inner lid 36 and the outer lid 32.

  A suction flow path 42 is formed between the inner second partition disk 35 and the outer first partition disk 34. The suction passage 42 communicates with the suction hole 22, and the peripheral portion of the suction hole 22 protrudes inward, and is substantially at the same interval over the entire suction passage 42. The suction passage 42 communicates with the outside through a punching hole formed in the outer peripheral portion 35a.

  The sound absorbing material holding space 39 between the inner partition disk 33 and the second partition disk 35, and between the first partition disk 34 and the second partition disk 35 forming a pair. The sound absorbing material holding space 40 and the sound absorbing material holding space 41 between the inner lid 36 and the outer lid 32 are filled with a sound absorbing material such as a wool-like sound absorbing material or a non-woven sound absorbing material, respectively. 37 is provided with a non-woven fabric of wool material. A dustproof filter 43 is provided around the inner partition disk 33, the first partition disk 34, the second partition disk 35, and the inner lid 36.

  As described above, between the outer flange 31b and the outer lid 32, the inner partition disk 33, the second partition disk 35, the first partition disk 34, the second partition disk 35, An integrated silencer 30 is configured by holding the inner lid 36 and fixing it with the fastening bolt 38.

  The silencer 30 is attached to the compressor 5 by fixing the inner flange 31 a to the compressor housing 10 with bolts 44.

  Next, the operation of the silencer 30 will be described.

  When the compressor 5 is driven, the compressor wheel 8 rotates and air is sucked in from the periphery of the silencer 30 through the suction port 14, the suction hole 22, and the suction flow path 42, and the dust filter Dust is removed in the process of passing through 43.

  The sucked air is sucked from the direction orthogonal to the axis of the silencer 30, flows into the intake hole 22, and then flows in the axis direction of the silencer 30. The suction flow path 42 has a cross section that is gently curved to the left (compressor direction) toward the axis, so that the sucked air has less pressure loss when the flow direction is changed. . Further, since the raised portion 36b is formed in the central portion of the inner lid 36, the air sucked along the inner lid 36 is smoothly flowed in the axial direction.

  The noise generated by the rotation of the compressor wheel 8 is released to the outside through the suction flow path 42, but is absorbed by the sound absorbing material through the hole of the punching metal in the process of passing through the suction flow path 42. . In addition, since the suction flow path 42 is curved, noise cannot travel straight through the suction flow path 42 and proceeds while colliding with the wall surface adjacent to the suction flow path 42, so that the sound absorption efficiency is improved.

  Incidentally, in order to further reduce the noise coming out in the axial direction, that is, the noise emitted through the inner lid 36 and the outer lid 32, the two inner lids 36 are overlapped and a two-layer sound absorbing material holding space is provided. 41, and each sound absorbing material holding space 41 may be filled with a sound absorbing material to form two sound absorbing layers.

  Moreover, although the said outer periphery part 34a, the said outer periphery part 35a, etc. curved in the outer side in the said embodiment, you may bend inward.

  In the silencer for a supercharger according to the present invention, almost all parts are formed by molding a plate material, and since there are no castings and machined parts, the cost of parts can be reduced, and rivets and collars are not used. The number of parts is greatly reduced, the assembly is simple, and the manufacturing cost can be reduced.

  Moreover, there is little pressure loss of air suction, intake efficiency improves, and the efficiency of a supercharger can be improved.

  2 is a diagram showing the pressure loss in the conventional silencer shown in FIG. 5 and the pressure loss of the silencer of the present invention shown in FIG. In FIG. 2, the solid line indicates the pressure loss of the silencer according to the present invention, and the broken line indicates the pressure loss of the conventional silencer, and the pressure loss is reduced in the silencer according to the present invention.

  The shapes of the first partition disk 34 and the second partition disk 35 are not limited to the shapes described above, and the sound absorbing material holding space 40 and the suction flow path 42 are alternately formed. It only has to be. For example, as shown in FIG. 3, the first partition disk 34 has a flat disk shape and an outer peripheral portion 34a is formed, and the second partition disk 35 has a flat disk shape and has an outer periphery. A portion 35a may be formed, and an inner peripheral portion 35b may be bent toward the first partition disc 34 so as to coincide with the inner peripheral edge of the first partition disc 34.

It is sectional drawing which shows the silencer of the supercharger which concerns on embodiment of this invention. It is a diagram which shows the pressure loss of the silencer of this supercharger. It is a fragmentary sectional view showing other examples of the 1st partition disk of the silencer concerning the present invention, and the 2nd partition disk. It is sectional drawing of the supercharger which comprises the conventional silencer. It is sectional drawing of the silencer of the conventional supercharger.

Explanation of symbols

5 Compressor 8 Compressor Impeller 14 Suction Port 22 Suction Port 30 Muffler 31 Connecting Flange 32 Outer Cover 33 Inner Partition Disk 34 First Partition Disk 34a Outer Peripheral Part 35 Second Partition Disk 35a Outer Peripheral Part 36 Inner Cover 39 Sound absorbing material holding space 40 Sound absorbing material holding space 41 Sound absorbing material holding space 42 Suction passage 43 Dustproof filter

Claims (4)

  A silencer for a turbocharger provided at an air intake port of an exhaust turbine supercharger, wherein an air intake hole concentric with the air intake port is formed at the center, and a spacer portion is formed by bending an outer peripheral portion. A first partition disk made of punching metal, and a second partition disk made of punching metal in which the suction hole concentric with the air suction port is formed in the center, and a spacer portion is formed by bending the outer peripheral portion; The first partition disk located on the air inlet side and the second partition disk located on the anti-air inlet side are paired, and the first partition disk and the second partition The disks are paired as required, and a gap is formed between the first partition disk and the second partition disk by the spacer portion, and the pair of the first partition disk and the second partition disk Closed space which is joined by the inner peripheral edge of the first partition disk and partitioned by the second partition disk; The inner space is alternately formed with an open space communicating with the intake hole, the closed space is a sound absorbing layer filled with a sound absorbing material, and the open space is a suction flow path that connects the outside and the intake hole. A silencer for a turbocharger characterized by   At least the periphery of the intake hole of the first partition disk and the second partition disk is a curved surface that faces the air suction port, and the curvature radius of the curved surface of the first partition disk is the first radius. The silencer for a supercharger according to claim 1, wherein the first partition disk and the second partition disk have a radius of curvature larger than the curvature radius of the curved surface of the second partition disk so as to join.   The cross section of the sound absorbing layer is a blade cross-sectional shape that is curved so that the peripheral portion of the intake hole faces the air intake port, the cross section of the intake flow path is maintained at substantially equal intervals, and the peripheral portion of the intake hole is the 2. The silencer for a supercharger according to claim 1, wherein the silencer has a curved shape toward the air inlet.   An inner partition plate having a hole communicating with the suction hole is disposed at the compressor side end, and an outer lid for closing the intake hole is disposed at the non-compressor side end, the outer lid, the first partition disk, The silencer for a supercharger according to claim 1, wherein the second partition disk and the inner partition plate are integrated by a fastening bolt that passes therethrough.

Images