JP6081390B2 - Intake silencer cover, exhaust turbine supercharger equipped with the same, and internal combustion engine - Google Patents

Description

  The present invention relates to an exhaust turbine supercharger, and more particularly to an intake silencer cover of an exhaust turbine supercharger mounted on a marine internal combustion engine or the like, an exhaust turbine supercharger including the same, and an internal combustion engine.

  As an exhaust turbine supercharger mounted on a marine internal combustion engine, for example, an (exhaust turbine) supercharger shown in FIGS. 1 and 3 of Patent Document 1 is known. In this supercharger, a cylindrical intake silencer is connected to an air intake port of a compressor, and this intake silencer draws air from the entire circumference of its outer peripheral surface.

JP 2011-43139 A

  As described above, if an intake silencer of the type that sucks air from the outer peripheral surface of the cylindrical shape is used, the intake noise of the compressor can be reduced. However, when the intake noise is not sufficiently reduced, further silence is achieved. Sexuality may be required. However, in order to improve the quietness of the intake silencer, it is necessary to change the specifications of the internal elements of the intake silencer or to replace the silencer itself, which consumes a great deal of cost.

  In addition, if the intake silencer is exposed to the surroundings, there is a concern that if there is dust or water droplets falling from above, the intake silencer will adhere to the intake silencer and become contaminated.

  The present invention has been made to solve the above-described problems, and can reduce the intake noise of the compressor and prevent the intake silencer from being polluted with a simple and inexpensive configuration without impairing maintainability. It is an object of the present invention to provide an intake silencer cover that can be used, an exhaust turbine supercharger including the same, and an internal combustion engine.

The present invention employs the following means in order to solve the above problems.
The intake silencer cover according to the first aspect of the present invention covers the periphery of an intake silencer installed upstream of the fluid flow of the compressor, and the intake silencer cover covers the intake silencer from above in the vertical direction. An outer peripheral plate surrounding at least the upper half of the intake silencer, a front plate fixed to the outer peripheral plate and covering a surface of the intake silencer far from the compressor, includes a back surface plate covering a side near surface from the fixed to the outer circumferential frame the compressor of the intake silencer, and a suction sound material that will be positioned between the intake silencer and the outer circumferential frame, wherein the front plate The intake silencer is fixed to a support member projecting from a surface far from the compressor, and is separated from a surface far from the compressor.

  By covering the intake silencer with the intake silencer cover having the above-described configuration, the noise reduction action of the sound absorbing material provided between the intake silencer cover and the intake silencer results in the intake silencer out of the intake noise generated by driving the compressor. Therefore, it is possible to effectively reduce intake noise that could not be silenced. For this reason, it is not necessary to change the specification of the internal element of the intake silencer or to replace the intake silencer itself, and it is possible to avoid the cost increase required for the modification or replacement of the intake silencer.

  The intake silencer cover is shaped so as to cover the intake silencer from above, and intake air is taken from below the intake silencer cover, so that the intake noise can be prevented from diffusing upward and the quietness can be further enhanced. In addition, it is possible to prevent dust, water droplets, and the like falling from above from accumulating inside the intake silencer cover, and it is possible to prevent contamination caused by inhalation of dust, water droplets, and the like accumulated on the intake silencer.

The intake silencer cover includes an outer peripheral plate surrounding at least the upper half of the intake silencer, a front plate fixed to the outer peripheral plate and covering a surface of the intake silencer far from the compressor, and the outer periphery and the back plate covering a side near surface from the fixed to the plate the compressor of the intake silencer, and suction sound material is Ru disposed between the intake silencer and the outer peripheral plate, a configuration in which a.

With this configuration, the intake silencer cover can be simplified. In particular, since the sound absorbing material is provided only between the outer peripheral plate and the intake silencer, it is possible to provide an intake silencer cover that is lightweight, does not burden the intake silencer, and can be manufactured at low cost.
Further, the front plate is fixed to a support member projecting from the surface of the intake silencer far from the compressor and separated from the surface far from the compressor, so that the intake silencer cover Maintaining good intake efficiency by suppressing the increase in intake resistance (pressure loss) due to the intake silencer cover by allowing air to flow between the face plate and the surface of the intake silencer far from the compressor Can do.
An intake silencer cover according to a second aspect of the present invention is an intake silencer cover that covers the periphery of an intake silencer installed on the upstream side of the fluid flow of the compressor, and the intake silencer cover extends above the intake silencer in the vertical direction. An outer peripheral plate that surrounds at least the upper half of the intake silencer and a front plate that is fixed to the outer peripheral plate and covers a surface of the intake silencer that is far from the compressor. includes a back surface plate covering the side near the surface from the compressor of the intake silencer is fixed to the outer circumferential frame, and a suction sound material that will be disposed between the outer peripheral plate and the intake silencer, the back A face plate is fixed to the intake silencer, and the outer peripheral plate and the front plate can be attached to and detached from the back plate.
According to this configuration, it is possible to remove the outer peripheral plate and the front plate while leaving the back plate on the intake silencer side, and it is possible to improve the detachability and to greatly improve the maintainability around the intake silencer.

In the intake silencer cover having the above configuration, the sound absorbing material may be held between the outer peripheral plate and a perforated plate that is detachably fixed to the inner surface of the outer peripheral plate.
By doing so, the sound absorbing material can be easily replaced while reliably preventing the sound absorbing material from peeling off or falling off. In addition, if the sound absorbing material is loaded in a compressed manner between the outer peripheral plate of the intake silencer cover and the perforated plate, the density of the sound absorbing material can be increased to improve the silencing effect.

In the intake silencer cover according to the present invention, the front plate is fixed to a support member projecting from a surface of the intake silencer far from the compressor and separated from a surface far from the compressor. It was.
This configuration suppresses the increase in intake resistance (pressure loss) due to the intake silencer cover that allows air to flow between the front plate of the intake silencer cover and the surface of the intake silencer far from the compressor. In addition, the intake efficiency can be kept good.

In the above-described configuration, it is preferable that the support member has a cylindrical shape, and an outer peripheral surface thereof is opposed to a flow of air flowing between the front plate and a surface of the intake silencer far from the compressor.
Thus, the front plate of the intake silencer cover, the outer periphery of the air flow supporting member that flows between the far side of the surface from the compressors of the intake silencer can be made flow smoothly, the support member less likely to be the resistance of the air flow Become. For this reason, a reduction in intake efficiency can be suppressed.

In addition, an intake silencer cover according to the present invention includes a leg portion that is self-supporting on an installation surface of an exhaust turbine turbocharger including the compressor.
As a result, at least a part of the weight of the intake silencer cover is supported by the legs, and the weight applied to the intake silencer is reduced, so that the strength burden on the intake silencer can be reduced.
Moreover, the intake silencer cover can be separated from the intake silencer and supported by the legs, which prevents the intake silencer cover from being affected by vibrations from the compressor side. Resonance can be prevented from increasing vibration and generating abnormal noise. Furthermore, the intake silencer cover can be easily attached and detached.

Further, the intake silencer cover according to the present invention is divided into a plurality of divided bodies along a dividing line passing through the vicinity of the axial extension line of the rotating shaft when viewed in the axial direction of the rotating shaft of the exhaust turbine turbocharger including the compressor. It can be divided.
Thus, since the intake silencer cover can be divided and connected to a plurality of divided bodies, the intake silencer cover can be easily transported and attached. Moreover, since the installation range of the intake silencer cover surrounding the intake silencer can be changed by changing the number of connections of the divided bodies, the silencing effect and the intake efficiency can be adjusted to a more appropriate one.

Further, turbocharger according to the present invention includes: the compressor, and the intake silencer installed in the fluid flow upstream of the compressor, the one of the intake silencer cover covering the periphery of the intake silencer And.
According to this exhaust turbine supercharger, the intake silencer is covered from above by the intake silencer cover, and the intake noise is silenced by the sound absorbing material provided on the inner peripheral surface of the intake silencer cover. For this reason, with a simple configuration, the intake noise generated by driving the compressor can be effectively reduced without being lost by the intake silencer without impairing the intake performance and maintainability. It is possible to prevent the intake silencer from being soiled.

  An internal combustion engine according to the present invention includes the exhaust turbine supercharger. According to this internal combustion engine, it is possible to obtain high reliability by ensuring intake performance and maintainability at a high level while suppressing intake noise of the compressor.

  As described above, according to the intake silencer cover according to the present invention, the exhaust turbine supercharger provided with the intake silencer cover, and the internal combustion engine, the intake noise of the compressor can be reduced without impairing maintainability with a simple and inexpensive configuration. It is possible to reduce and prevent the intake silencer from being soiled.

1 is a perspective view showing a schematic configuration of an upper part of a marine internal combustion engine in which an intake silencer cover according to the present invention is applied to an exhaust turbine supercharger. It is a perspective view of an exhaust turbine supercharger and an intake silencer cover. It is a longitudinal cross-sectional view of an exhaust turbine supercharger and an intake silencer cover. It is a longitudinal cross-sectional view of the intake silencer and the intake silencer cover which concern on 1st Embodiment of this invention. FIG. 5 is a front view of an intake silencer and an intake silencer cover as viewed in the direction of arrow V in FIG. 4. It is the longitudinal cross-sectional view which expanded the upper part of FIG. It is the perspective view which looked at the intake silencer, the intake silencer cover, and the support member from the bottom. It is a front view of the intake silencer and the intake silencer cover which concern on 2nd Embodiment of this invention. It is a front view of the intake silencer and the intake silencer cover which concern on 3rd Embodiment of this invention.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a schematic configuration of an upper part of a marine internal combustion engine (a two-cycle low speed diesel engine mainly used as a main engine of a ship) in which an intake silencer cover according to the present invention is applied to an exhaust turbine supercharger.

  The marine internal combustion engine 1 includes a cylinder part 2 and an exhaust receiver (exhaust collecting pipe: exhaust manifold) 3 and is installed in an engine room of a ship (not shown). The marine internal combustion engine 1 is equipped with a plurality (two in this embodiment) of exhaust turbine superchargers 10 and a plurality of air coolers (not shown).

In each cylinder portion 2, a piston (not shown) connected to the crankshaft is arranged. In addition, an exhaust port (not shown) of each cylinder part 2 is connected to the exhaust receiver 3 via an individual exhaust pipe 6. The opening part of each individual exhaust pipe 6 with respect to the cylinder part 2 includes the opening part. An exhaust valve 7 for opening and closing is disposed. Further, the exhaust receiver 3 and the exhaust turbine 11 of the exhaust turbine supercharger 10 are connected via the collective exhaust pipe 8.

  As shown in at least one of FIGS. 2 and 3, the exhaust turbine supercharger 10 is rotationally driven by an exhaust turbine 11 driven by exhaust gas discharged from the marine internal combustion engine 1 and the exhaust turbine 11. A rotary shaft 12, a compressor 13 that compresses air when the rotary shaft 12 is rotationally driven, and a bearing stand 14 that is provided between the exhaust turbine 11 and the compressor 13 and supports the rotary shaft 12. ing.

The exhaust turbine 11 includes a turbine casing 17, a turbine disk 18 that is rotated by exhaust gas supplied from the marine internal combustion engine 1, and turbine blades 19 that are provided in the circumferential direction of the turbine disk 18.
The turbine casing 17 is provided so as to cover the turbine disk 18 and the turbine blade 19. The turbine casing 17 passes through a turbine casing inlet 17 a through which exhaust gas is guided from the exhaust receiver 3 of the marine internal combustion engine 1, an exhaust gas passage 17 b that guides exhaust gas of the marine internal combustion engine 1 to the turbine blade 19, and the turbine blade 19. And a turbine casing outlet 17c for guiding the exhaust gas to the outside of the exhaust turbine supercharger 10.

  The turbine disk 18 has a disk shape, and a plurality of turbine blades 19 extending from the center of rotation toward the radially outer side are provided along the circumferential direction. Exhaust gas is guided to the turbine blade 19 as indicated by an arrow G from the exhaust gas passage 17b. The turbine disk 18 and the rotating shaft 12 are rotationally driven by the exhaust gas guided to the turbine blade 19. The exhaust gas that rotationally drives the turbine disk 18 and the rotating shaft 12 flows out from the turbine blade 19 to the turbine casing outlet 17c.

The compressor 13 includes a compressor casing 21 and an impeller 22 that is rotationally driven to compress air.
The compressor casing 21 is provided so as to cover the impeller 22. The compressor casing 21 includes a compressor casing inlet 21a (air intake port) that takes in air from outside via an intake silencer 23, a spiral chamber 21b into which air compressed by the impeller 22 is guided, and air compressed by the impeller 22 And a compressor casing outlet 21c.

  The impeller 22 has a substantially disk shape, and a plurality of compressor blades 24 extending from the center toward the radially outer side are provided on one surface thereof. The impeller 22 is covered with a spiral chamber 21b so as to surround the radially outer side. As shown by the arrow A, the air sucked from the compressor casing inlet 21 a is guided to the impeller 22 through the intake silencer 23. The impeller 22 is rotationally driven when the exhaust turbine 11 provided on the same axis is rotationally driven. The air sucked from the compressor casing inlet 21 a is compressed by the rotationally driven impeller 22, and the compressed air is sent out radially outward of the impeller 22. The air compressed by the impeller 22 passes through the spiral chamber 21b and is introduced from the compressor casing outlet 21c through the air cooler to the main engine as combustion air.

  A rotating shaft 12 having one end protruding toward the exhaust turbine 11 and the other end protruding toward the compressor 13 is inserted into the bearing base 14. Further, a turbine casing 17 and a compressor casing 21 are connected to the bearing stand 14. The bearing stand 14, the turbine casing 17, and the compressor casing 21 are fastened together by bolts (not shown).

  As shown in FIGS. 2 to 4, the intake silencer 23 is a cylindrical outer peripheral suction type silencer, and is formed in a cylindrical shape centering on the axial extension line C (see FIGS. 3 to 5) of the rotary shaft 12. It is attached to a compressor casing inlet 21 a that is an air suction port of the compressor 13. The intake silencer 23 takes in air from its outer peripheral surface 23a, removes the air, and reduces intake noise.

Specifically, the intake silencer 23 includes two disks 31 and 32 having the same outer diameter and arranged in parallel at a distance so as to be orthogonal to the axial extension line C of the rotating shaft 12. . A circular hole 33 is formed concentrically at the center in the radial direction of the disk 32 on the side closer to the compressor 13, and a central cylinder 34 is inserted through the circular hole 33. The center tube 34 has a tip end fixed to the inner surface of the disk 31 and a rear outer peripheral portion fixed to the inner periphery of the circular hole 33. A section of the central cylinder 34 between the disc 31 and the disc 32 is porous (for example, net-like).

A plurality of substantially triangular reinforcing plates 35 are fixed across the surface of the disk 32 closer to the compressor 13 and the outer peripheral surface of the center tube 34, and are attached to the end of the center tube 34 closer to the compressor 13. A ring-shaped connection flange plate 36 is fixed. The connection flange plate 36 is fixed to the compressor casing 21 with bolts (not shown). Although omitted in FIG. 3, as shown in FIG. 4, a rectifying cylinder 37 for adjusting the flow of air is provided inside the center cylinder 34.

  A cleaner element 38 for removing dust in the air is wound around the outer periphery of the center tube 34 between the disks 32 and 32. As indicated by an arrow A in FIG. 3, the air sucked into the compressor 13 passes between an intake silencer cover 40 and an intake silencer 23, which will be described later, from the outer peripheral surface (23a) of the cleaner element 38 to the cleaner element 38. Then, the dust is removed through the perforated portion of the central cylinder 34, and is discharged to the central portion of the intake silencer 23, and is sucked into the compressor 13 from the compressor casing inlet 21 a.

  An intake silencer cover 40 that covers the periphery of the intake silencer 23 is provided. The intake silencer cover 40 is configured to reduce the intake noise generated by the drive of the compressor 13 when air is sucked into the intake silencer 23, the intake noise that cannot be completely silenced by the intake silencer 23, It is a cover provided to shield the rotational noise of the impeller 22 and improve silence.

[First Embodiment]
Next, details of the intake silencer cover 40 according to the first embodiment of the present invention will be described.
As shown in FIG. 5, the intake silencer cover 40 has a shape that covers the intake silencer 23 from above and opens downward. For example, in the present embodiment, the intake silencer cover 40 covers a range from the top of the intake silencer 23 to the vicinity of the center, and is formed in a semi-cylindrical shape having a radius larger than the radius of the intake silencer 23 in a front view shown in FIG. Has been. The height H or the radius R of the intake silencer cover 40 may be increased to increase the range covering the intake silencer 23.

As shown in FIG. 6, the intake silencer cover 40 includes an outer peripheral plate 41, a front plate 42, and a back plate 43. These plates 41, 42, 43 are made of metal such as steel or light alloy, but may be formed of non-metallic material such as resin or composite material.
The outer peripheral plate 41 is a plate that is curved and formed in a semi-cylindrical shape that surrounds at least the upper half of the intake silencer 23 at a predetermined distance (for example, about 100 mm to 150 mm) away from the outer peripheral surface 23 a of the intake silencer 23.

A preferable range for the angle at which the outer peripheral plate 41 surrounds the intake silencer 23 is about 120 to 180 degrees. If the winding angle is larger than that, pressure loss occurs in the intake silencer 23, which is not preferable.
A preferable range for the angle at which the outer peripheral plate 41 surrounds the intake silencer 23 is about ± 60 ° to ± 90 °, with the uppermost apex portion of the peripheral portion of the intake silencer 23 being 0 degrees around the central axis of the intake silencer 23. It is. When surrounding the upper half of the intake silencer 23, the angle is ± 90 degrees. If the winding angle is larger than that, pressure loss occurs in the intake silencer 23, which is not preferable.
Further, depending on the relative positional relationship with the peripheral equipment of the exhaust turbine supercharger 10, the topmost apex portion of the intake silencer 23 may be rotated at an appropriate angle in either the forward or reverse rotation direction without setting it to 0 degrees. Also good.

The front plate 42 is fixed to the end of the outer peripheral plate 41 on the side far from the compressor 13, and covers the front plate 42 at a predetermined distance (for example, about 100 mm to 150 mm) away from the surface 31 a far from the compressor 13 of the intake silencer 23. It is a circular (or fan-shaped) plate.
The back plate 43 is a plate that is fixed to the end of the outer peripheral plate 41 on the side closer to the compressor 13 and covers the surface 32a on the side closer to the compressor 13 of the intake silencer 23, and the outer peripheral shape thereof is the same as that of the front plate 42. Although it is the same, it has an arch shape that avoids the central cylinder 34 of the intake silencer 23.

As shown in an enlarged view in FIG. 6, each of the inner peripheral surface of the end portion of the outer peripheral plate 41 far from the compressor 13 and the inner peripheral surface of the end portion closer to the compressor 13 is a metal square member The frame members 45 and 46 formed by bending the arch member are fixed by welding or the like. A front plate 42 is fixed to the outer end face of the frame member 45 by welding or the like.

On the other hand, the inner peripheral edge of the back plate 43 is fixed to a fastening boss 48 fixed to the back surface of the disc 32 of the intake silencer 23 with a bolt 49. A frame member 50 obtained by bending a metal square member into an arch member is fixed to the inner surface of the outer peripheral edge portion of the back plate 43 by welding or the like, and this frame member 50 is stacked on the frame member 46 of the outer peripheral plate 41. The bolt 51 is fastened to the frame member 46.
For this reason, by removing the bolt 51, the outer peripheral plate 41 is bordered on the joint surface M between the frame member 46 and the frame member 50 while the back plate 43 is fixed to the intake silencer 23 (disc 32) side. And the front plate 42 can be attached to and detached from the back plate 43. A suspension hook 52 (see FIG. 4) for lifting with a crane or the like is provided on the top of the intake silencer cover 40.

  A sound absorbing material 53 such as glass wool is covered on the inner peripheral surface of the outer peripheral plate 41. The sound absorbing material 53 is held between the inner surface of the outer peripheral plate 41 and the perforated plate 54 attached with a space between the inner surface. As shown in FIG. 6, both edges of the perforated plate 54 are fastened to the frame members 45 and 46 of the outer peripheral plate 41 with bolts 55. By removing the bolt 55, the sound absorbing material 53 can be replaced by removing the perforated plate 54. Since the sound absorbing material 53 is loaded in a step portion generated between the inner peripheral surface of the outer peripheral plate 41 and the frame members 45 and 46, the fastening force of the bolt 55 that fixes the porous plate 54 reaches the sound absorbing material 53. This prevents the sound absorbing material 53 from being crushed or damaged.

  The sound absorbing material 53 is not provided on the inner surfaces of the front plate 42 and the back plate 43. The reason is that the intake silencer 23 is of the outer periphery suction type, and the flow velocity of the airflow between the outer peripheral surface 23a and the outer peripheral plate 41 is fast, but the space between the end surface (31a) of the intake silencer 23 and the front plate 42 is This is because the intake air noise is less likely to be radiated due to the low flow velocity. Thus, by providing the sound absorbing material 53 only on the inner surface of the outer peripheral plate 41, the intake silencer cover 40 can be significantly reduced in weight and cost.

On the other hand, as shown in FIGS. 3 to 5 and 7, the front plate 42 of the intake silencer cover 40 is bolted to a plurality of support members 58 projecting from a surface 31 a far from the compressor 13 of the intake silencer 23. It is fastened and fixed at 59 and is supported away from the intake silencer 23. The gap between the plurality of support members 58 is, for example, 75 mm.
The support member 58 has a cylindrical shape parallel to the axial direction of the rotary shaft 12 of the exhaust turbine supercharger 10, and as shown in FIGS. 5 and 7, the intake silencer 23 is aligned in the horizontal direction at a predetermined interval. The disc 31 is projected by welding or the like. The outer peripheral surface of the columnar support member 58 faces the air flow (arrow A shown in FIGS. 3, 4, and 7) flowing between the front plate 42 and the surface 31 a of the intake silencer 23. .

By covering the intake silencer 23 with the intake silencer cover 40 configured as described above, the intake noise generated by the compressor 13 due to the silencing action of the sound absorbing material 53 mounted on the inner peripheral surface of the intake silencer cover 40 is greatly increased. Can be reduced.
Therefore, it is not necessary to change the specifications of the cleaner element 38 or to replace the entire intake silencer 23 with another type in order to bring the silencer performance to the intake silencer 23, and a great cost is required for these modifications. Up can be avoided.

Since the intake silencer cover 40 is shaped to cover the intake silencer 23 from above, air intake from the lower side of the intake silencer cover 40 prevents the intake noise from diffusing upward and improves quietness. be able to.
Moreover, since the lower portion of the intake silencer cover 40 is open, dust or water drops falling from above do not accumulate inside the intake silencer cover 40, and the accumulated dust, water droplets, etc. There is no possibility of being sucked into the silencer 23. Therefore, the intake silencer 23 can be prevented from being soiled.

  Further, the intake silencer cover 40 has a simple configuration including an outer peripheral plate 41, a front plate 42, a back plate 43, and a sound absorbing material 53. In particular, the sound absorbing material 53 is provided only on the inner peripheral surface of the outer peripheral plate 41. Therefore, it is lightweight, does not burden the intake silencer 23, and can be manufactured at low cost.

  Further, since the intake silencer cover 40 holds the sound absorbing material 53 between the outer peripheral plate 41 and the porous plate 54 that is detachably fixed to the inner surface of the outer peripheral plate 41, the sound absorbing material 53 is peeled off. It is possible to facilitate the replacement while reliably preventing or dropping off. In addition, since the sound absorbing material 53 can be loaded between the outer peripheral plate 41 and the porous plate 54 in a compressed manner, it is possible to increase the density of the sound absorbing material 53 and improve the silencing effect.

Further, the intake silencer cover 40, the front plate 42, fixed to a support member 58 which projects from the compressor 13 to the far side of the surface 31a of the intake silencer 23, the surface far from the compressors 13 31a It is separated from. This configuration, intake resistance due to as air flows, is provided an intake silencer cover 40 between the far side of the surface 31a from compressors 13 of the front plate 42 and the intake silencer 23 of the intake silencer cover 40 ( The increase in pressure loss) can be suppressed, and the intake efficiency can be kept good.

As described above, the support member 58 that supports the front plate 42 has a cylindrical shape, and the outer peripheral surface of the support member 58 flows between the front plate 42 and the surface 31a far from the compressor 13 of the intake silencer 23. (See FIGS. 3, 4 and 7). Therefore, coupled with the between the supporting members 58 has sufficient void (e.g. 75 mm), air A flowing between the front plate 42 and the far side of the surface 31a from compressors 13 of the intake silencer 23 is supported The outer periphery of the member 58 can flow smoothly, and the support member 58 is less likely to be airflow resistance. For this reason, a reduction in intake efficiency can be suppressed.

  Further, as shown in FIG. 6, the intake silencer cover 40 has a back plate 43 fixed to the intake silencer 23 side, and the outer peripheral plate 41 and the front plate 42 are located at the position of the joint surface M with respect to the back plate 43. Detachable. For this reason, it is possible to quickly remove the outer peripheral plate 41 and the front plate 42 while leaving the back plate 43 on the intake silencer 23 side. Therefore, the detachability of the intake silencer cover 40 can be improved, and the workability of maintenance work around the intake silencer 23 (replacement or cleaning of the cleaner element 38, etc.) can be greatly improved.

[Second Embodiment]
Next, an intake silencer cover 60 according to a second embodiment of the present invention will be described with reference to FIG. In the intake silencer cover 60, the same reference numerals are given to the respective parts having the same configuration and operation as the intake silencer cover 40 of the first embodiment, and the description thereof will be omitted.

  In the intake silencer cover 40 of the first embodiment, the entire structure is supported by the intake silencer 23. However, the intake silencer cover 60 is a leg portion that is self-supporting on the installation surface G of the exhaust turbine supercharger. 62, and at least a part of its own weight is supported by the leg portion 62. A caster 63 with a brake is provided at the tip of the leg portion 62.

  As a result, at least a part of the weight of the intake silencer cover 60 is supported by the legs 62, and the weight applied to the intake silencer 23 is reduced. Therefore, the strength burden on the intake silencer 23 can be reduced. Further, the intake silencer cover 60 can be easily attached and detached.

For example, the leg portions 62 are provided at the four corners or the like of the intake silencer cover 60 in a plan view so that the entire weight of the intake silencer cover 60 is supported by the leg portions 62, and the intake silencer cover 60 is separated from the intake silencer 23 and installed. It can also be installed independently on G.
By doing so, it is possible to prevent the influence of vibrations from the compressor 13 side from affecting the intake silencer cover 60, and the intake silencer cover 60 can resonate to increase vibration or generate abnormal noise. Can be prevented.

  Further, the leg portions 62 are provided at the four corners of the intake silencer cover 60 in plan view to support the intake silencer cover 60, and the outer peripheral plate 41 and the back plate 43 are divided at the joint surface M as shown in FIG. You may be able to do it. In this way, when the intake silencer cover 60 is removed, the joint surface M is divided and then the brake of the caster 63 is released, and the intake silencer cover 60 is pulled forward, so that it is easy without requiring a crane or a large number of human hands. The intake silencer cover 60 can be removed from the intake silencer 23.

[Third Embodiment]
Next, an intake silencer cover 70 according to a third embodiment of the present invention will be described with reference to FIG.
The intake silencer cover 70 can be divided into a plurality of divided bodies 70A and 70B along a dividing line P passing through the vicinity of the axial center extension line C of the rotating shaft as viewed in the axial direction of the rotating shaft of the exhaust turbine supercharger. It has become. The dividing line P is provided with a connecting means (not shown) for airtightly connecting the divided bodies 70A and 70B.

    In the present embodiment, two divided bodies 70A and 70B having an angle of 90 degrees are connected with the vertical dividing line P as a boundary. For example, three divided bodies having an angle of 60 degrees are connected. You may do it. Each of the divided bodies 70A and 70B is provided with a lifting hook 52 for lifting. The suspension hook 52 is preferably provided directly above the center of gravity of each of the divided bodies 70A and 70B.

  Thus, since the intake silencer cover 70 can be divided and connected to the plurality of divided bodies 70A and 70B, the intake silencer cover 70 can be easily transported and detached. Moreover, since the range surrounding the intake silencer 23 can be changed by changing the number of connections of the divided bodies in accordance with the operating conditions, required specifications, etc., the silencing effect and the intake efficiency can be adjusted.

  In addition, since the suspension hook 52 is provided right above the gravity center position of each divided body 70A, 70B, when each divided body 70A, 70B is lifted alone, each divided body 70A, 70B tilts. Therefore, the mounting posture can be maintained, and attachment / detachment work to / from the intake silencer 23 is facilitated.

  As described above, according to the intake silencer covers 40, 60, 70 according to the above-described embodiments, a simple and low-cost configuration allows compression without deteriorating the intake performance and maintainability of the intake silencer 23. Of the intake noise generated by driving the machine 13, the intake noise that could not be silenced by the intake silencer 23 can be effectively reduced, and the intake silencer 23 can be prevented from being contaminated.

  Further, by providing the exhaust turbine supercharger 10 with the intake silencer covers 40, 60, 70 configured as described above, the intake noise of the intake silencer 23 can be reduced with a simple configuration without impairing the intake performance and maintainability. And the contamination of the intake silencer 23 can be prevented.

  And according to the internal combustion engine 1 provided with this exhaust turbine supercharger 10, while ensuring intake performance and maintainability while suppressing intake noise, high reliability can be obtained.

  The present invention is not limited to the configuration of each of the embodiments described above, and can be appropriately modified or improved within the scope not departing from the gist of the present invention. Embodiments are also included in the scope of rights of the present invention.

For example, in each of the above embodiments, the intake silencer covers 40, 60, 70 are formed of a metal plate material. However, if a sufficient noise reduction effect is obtained, a punching plate (perforated plate), a metal net, or the like is used. Forming is also conceivable.
Furthermore, as a modification, it is conceivable to form an intake silencer cover having a structure in which the sound absorbing material 53 is supported only by a frame material without using a cover member made of a plate material. In this case, even if a part of the sound absorbing material 53 is dropped, the dropped piece is not blocked by the cleaner element 38 of the intake silencer 23 and sucked into the compressor 13.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 10 Exhaust turbine supercharger 11 Exhaust turbine 12 Rotating shaft 13 Compressor 21a Compressor casing inlet (air inlet)
23 intake silencer 23a intake silencer of the outer peripheral surface 31a intake surface 40, 60, 70 intake surface 32a side close to the compressor intake silencer remote from the compressors of the silencer silencer cover 41 outer circumferential frame 42, front plate 43 the back side plate 53 Sound absorbing material 54 Perforated plate 58 Support member 62 Leg parts 70A, 70B Split body A Air flow C Axis extension line G of rotating shaft G Exhaust turbine turbocharger installation surface M Joint surface P Split line

Claims (8)

An intake silencer cover covering the periphery of the intake silencer installed upstream of the fluid flow of the compressor,
The intake silencer cover is configured to cover the intake silencer from above in the vertical direction and open downward.
An outer peripheral plate surrounding at least the upper half of the intake silencer;
A front plate fixed to the outer peripheral plate and covering a surface of the intake silencer far from the compressor;
A back plate that is fixed to the outer peripheral plate and covers a surface of the intake silencer closer to the compressor;
A suction sound material which Ru is disposed between the intake silencer and the outer circumferential frame,
With
The intake silencer cover according to claim 1, wherein the front plate is fixed to a support member projecting from a surface of the intake silencer farther from the compressor and spaced from a surface farther from the compressor. An intake silencer cover covering the periphery of the intake silencer installed upstream of the fluid flow of the compressor,
The intake silencer cover is configured to cover the intake silencer from above in the vertical direction and open downward.
An outer peripheral plate surrounding at least the upper half of the intake silencer;
A front plate fixed to the outer peripheral plate and covering a surface of the intake silencer far from the compressor;
A back plate that is fixed to the outer peripheral plate and covers a surface of the intake silencer closer to the compressor;
A suction sound material which Ru is disposed between the intake silencer and the outer circumferential frame,
With
The intake silencer cover, wherein the back plate is fixed to the intake silencer, and the outer peripheral plate and the front plate are detachable from the back plate.   The intake silencer cover according to claim 1 or 2, wherein the sound absorbing material is held between an inner surface of the outer peripheral plate and a porous plate that is detachably fixed to the inner surface of the outer peripheral plate. .   The support member has a cylindrical shape, and an outer peripheral surface thereof faces a flow of air flowing between the front plate and a surface of the intake silencer far from the compressor. The intake silencer cover according to Item 1.   The intake silencer cover according to any one of claims 1 to 4, further comprising a leg portion that is self-supporting on an installation surface of an exhaust turbine supercharger including the compressor.   6. The exhaust turbine turbocharger including the compressor can be divided into a plurality of divided bodies along a dividing line passing through the vicinity of the axial extension line of the rotating shaft as viewed in the axial direction of the rotating shaft of the exhaust turbine supercharger. The intake silencer cover according to any one of the above. The compressor;
The intake silencer installed upstream of the fluid flow of the compressor;
The intake silencer cover according to any one of claims 1 to 6, which covers the periphery of the intake silencer;
An exhaust turbine supercharger comprising:   An internal combustion engine comprising the exhaust turbine supercharger according to claim 7.

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