JP5804962B2 - Supercharger silencer and supercharger provided with the same - Google Patents

Description

  The present invention relates to a turbocharger silencer that silences noise generated from intake air in a turbocharger, and is suitable for use in, for example, a turbocharger used in a large diesel engine for ships or power generation. The present invention relates to a silencer and a supercharger equipped with the silencer.

  2. Description of the Related Art Conventionally, some engines include a supercharger that compresses intake air and sends it to a combustion chamber in order to achieve high output while maintaining light weight and compactness. And the technique provided with the intake silencer (silencer) for reducing the intake sound which generate | occur | produces at the time of supercharging by this supercharger is common.

  In recent years, high pressure ratios and high efficiency are required for superchargers in order to increase engine output, and as a result, superchargers have been driven at high speeds. And the noise from a supercharger also becomes large by the drive of the high rotation speed of this supercharger.

  As a countermeasure against the noise of the supercharger described above, a silencer that silences the intake air is provided on the compressor inlet side. The following patent documents 1 and 2 are disclosed as a reference for such measures.

  In Patent Document 1, since two bent portions are formed in each passage, a sound wave having a frequency higher than the fundamental frequency collides with the bent portion, and the passage of a sound wave having a frequency higher than the basic frequency is prevented. doing. Thus, a method is shown in which the passage of sound waves can be subdivided, the passage length can be increased, and the muffled sound volume can be increased.

  In Patent Document 2, a highly safe intake silencer (silencer) is configured since there is no occurrence of foreign matters such as fixtures and residual spatter that are damaged in the intake silencer (silencer). As a result, a method is shown in which a high noise reduction effect can be obtained as compared with the prior art, and the configuration is simple and the number of manufacturing steps can be reduced.

Japanese Patent Laid-Open No. 11-200969 JP-A-2005-320915

  Patent Document 1 describes a method in which a sound wave path can be subdivided to increase the passage length and increase the muffled sound volume. However, since the sound absorbing element has a special shape, the production cost increases. Further, since it is necessary to install the sound absorbing element covered with the punching metal on the sound absorbing material by welding to the silencer (silencer) main body, there is a problem that it is difficult to replace the element when the element becomes dirty.

  In Patent Document 2, a high noise reduction effect can be obtained as compared with the prior art, the structure is simple, the number of manufacturing steps can be reduced, and the occurrence of foreign matters such as fixtures and residual spatter in the intake silencer (silencer) is eliminated. A method is described. However, there is a problem that the width of the sound absorbing element and the intake flow path is uniform, and the frequency range where the sound reduction effect is expected is narrow.

  The present invention has been made in view of such circumstances, and has a simple structure, a high silencing effect and maintainability can be obtained, and a turbocharger silencing device that prevents the impeller of the turbocharger from being damaged and the same It aims at providing the supercharger provided with.

In order to solve the above problems, the supercharger silencer of the present invention and the supercharger equipped with the same employ the following means.
The supercharger silencer of the present invention is a supercharger that sucks air from an outer peripheral surface that is a cylindrical surface and supplies the air from the inner peripheral surface that is a cylindrical surface while silencing the air. A silencer, wherein a plurality of substantially flat plate-shaped sound absorbing elements that are in contact with the inner peripheral surface and extend from the inner peripheral surface to the outer peripheral surface in a tangential direction are provided at a predetermined interval, Each of the sound absorbing elements can be mounted by inserting a sound absorbing material having a substantially flat plate shape and sliding the sound absorbing material from the outer peripheral surface side while being fixed at a predetermined position. And a frame that is detachable by sliding toward the outer peripheral surface side and supports the sound absorbing material in the extending direction of the sound absorbing element.

  Since the sound absorbing element has a flat plate shape, the structure is simple. Therefore, it is not necessary to process the sound absorbing material used for the sound absorbing element, and a standard product can be used. Further, since the sound absorbing element has a flat plate shape, the support frame of the sound absorbing element in a state in which the sound absorbing material is removed can be easily fixed to the inner peripheral surface having a cylindrical surface by welding or the like. When fixing by welding, the slag generated during welding is not likely to adhere to the sound absorbing material by welding with the internal sound absorbing material removed. There is no risk of damaging the impeller by colliding with the impeller. In addition, since the sound absorbing material inside the sound absorbing element can be attached and detached after the support frame of the sound absorbing element is installed by welding, maintenance can be easily performed.

  Further, in the turbocharger silencer according to the present invention, the sound absorbing elements are arranged between the sound absorbing elements so as to be substantially parallel to the sound absorbing elements and extend from the outer peripheral surface to a middle position in the radial direction. A substantially flat plate-like second sound absorbing element is provided.

Since the second sound absorbing element is arranged between the sound absorbing elements, it is possible to divide the sound that has entered one flow path into a plurality of parts. By dividing the sound into a plurality of parts, sound waves can interfere with each other and noise can be reduced. Moreover, since the flow path of a different shape is formed by installation of a 2nd sound absorption element, the sound of a different frequency can be absorbed.
The supercharger silencer of the present invention is a supercharger that sucks air from an outer peripheral surface that is a cylindrical surface and supplies the air from the inner peripheral surface that is a cylindrical surface while silencing the air. A silencer, wherein a plurality of substantially flat plate-like sound absorbing elements that are in contact with the inner peripheral surface and extend to the outer peripheral surface are provided at a predetermined interval, and each of the sound absorbing elements is a substantially flat plate A sound-absorbing material having a shape, and a frame body in which the sound-absorbing material can be inserted from the outer peripheral surface side and supported in the extending direction of the sound-absorbing element, and between these sound-absorbing elements, A substantially flat plate-like second sound absorbing element is provided that is disposed substantially parallel to the sound absorbing element and extending from the outer peripheral surface on the air suction side to a midway position on the radially inner side. Features.

  Furthermore, the turbocharger silencer according to the present invention is characterized in that a rectifying portion tapered toward the downstream side is provided at the downstream end of the sound absorbing element.

  Since the rectifying portion tapered toward the downstream side is provided at the downstream end of the sound absorbing element, it is possible to prevent the occurrence of a wake that occurs downstream of the sound absorbing element and to obtain a further silencing effect. it can.

  Furthermore, in the supercharger according to the present invention, any one of the above-described supercharger silencing devices is provided at the suction port.

  It is possible to realize a supercharger equipped with a supercharger silencer that can be easily assembled and can easily replace the sound absorbing material. After the sound absorbing element support frame is fixed to the inner peripheral surface of the cylindrical surface by welding or the like, the sound absorbing material can be inserted from the outer peripheral surface of the cylindrical surface. Thereby, since there is no possibility that slag at the time of welding adheres to a sound-absorbing material, for example, there is no possibility that slag will collide with the impeller of the supercharger during operation, and thus it is possible to prevent the impeller from being damaged.

  According to the present invention, even when the sound absorbing element is dirty, the sound absorbing material inside the sound absorbing element can be attached and detached, so that maintenance such as cleaning and replacement of the sound absorbing material can be easily performed. Further, since the sound absorbing material can be cleaned, the impeller of the supercharger can be prevented from being damaged.

It is the longitudinal section showing the supercharger to which the silencer concerning the present invention is applied. It is a front view of the silencer shown in FIG. It is a schematic block diagram of the sound-absorbing element of the silencer shown in FIG. It is the front view which showed 2nd Embodiment of the silencer which concerns on this invention. It is detail drawing of the silencer shown in FIG. It is the longitudinal cross-sectional view which showed the supercharger provided with the conventional silencer.

Hereinafter, a supercharger silencer according to the present invention (hereinafter simply referred to as a “silencer”) and a supercharger including the same will be described with reference to FIGS. 1 to 3 and FIG. 6. .
[First Embodiment]
FIG. 6 is a longitudinal sectional view showing an exhaust turbine supercharger (hereinafter simply referred to as “supercharger”) 10 equipped with a conventional silencer 30. The silencer according to the present invention can be applied to the supercharger 10 in place of the conventional silencer 30.
The supercharger 10 is mounted on, for example, a marine diesel engine (for example, a low-speed two-cycle diesel engine) (not shown) and communicates with the inside of a cylinder liner (not shown) that constitutes the marine diesel engine (see FIG. (Not shown) for supplying compressed air.

  The supercharger 10 is configured by integrally fastening a gas inlet casing 11, a gas outlet casing 12, a bearing base 13, and an air guide casing 14 on the compressor side with bolts (not shown). The rotor shaft 15 is rotatably supported in the bearing base 13 by a thrust bearing 16 and radial bearings 17 and 18, and a turbine 19 constituting a turbine portion is solidified at one end, and a compressor portion is provided at the other end. The compressor impeller (impeller) 20 which comprises is consolidated.

The turbine 19 on one end side has a large number of blades 19a on the outer periphery. The blade 19 a is disposed between an exhaust gas introduction path 22 provided in the gas inlet casing 11 and an exhaust gas discharge path 23 provided in the gas outlet casing 12.
On the other hand, the compressor impeller 20 on the other end side has a large number of blades 20a on the outer peripheral portion. The blade 20 a is disposed behind an intake air introduction path (intake port) 24 provided in the air guide casing 14. The intake air introduction path 24 is connected to the spiral chamber 25 via the compressor impeller 20, and the spiral chamber 25 is connected to the combustion chamber of the engine via an intake air introduction path (not shown).

FIG. 1 shows a partial longitudinal section in which the silencer 2 of the present invention is applied to the supercharger 10 described above.
As shown in the figure, the silencer 2 is provided on the upstream side of the intake air introduction path 24. This silencer 2 is a device installed upstream (upstream side) of the suction port 26 through which the intake air compressed by the compressor unit is sucked, and has a filter function that rectifies the air flow by passing the intake air; It has a silencing function that absorbs noise generated by the intake air.

  As shown in FIG. 2, the silencer 2 is provided with a plurality of substantially plate-shaped sound absorbing elements 5. Each of the sound absorbing elements 5 having a substantially flat plate shape is disposed upright in the axial direction of the supercharger 10, and extends in a tangential direction from the inner peripheral surface 3 of the silencer 2 that is a cylindrical surface. It extends to the outer peripheral surface 4 of the silencer 2. One end of the sound absorbing element 5 is disposed so as to be a tangential plane of the inner peripheral surface 3, and the other end is disposed on the outer peripheral surface 4 which is a cylindrical surface. The sound absorbing elements 5 are installed so that the intervals are substantially equal. By disposing the sound absorbing elements 5 in this way, an air flow path in which the width of the flow path is gradually narrowed from the outer peripheral surface 4 to the inner peripheral surface 3 is formed.

FIG. 3 shows a detailed structure of each silencer element 5 shown in FIG. The sound absorbing element 5 includes a sound absorbing material 7 having a substantially flat plate shape and a frame that allows the sound absorbing material 7 to be inserted from the outer peripheral surface 4 side. The frame includes a partition plate 6 provided in the extending direction of the sound absorbing element 5 and a support frame 8 provided in a state of being separated by a predetermined distance so as to sandwich the partition plate 6 from both sides. For example, a punching metal is used for the support frame 8, and a fixing portion for welding (not shown) is provided.
At the downstream end (inner peripheral end) of the partition plate 6 and the support frame 8, a rectifying portion 9 that is tapered toward the downstream side is provided.
Since it has such a structure, after fixing frame bodies, such as the partition plate 6 and the support frame 8, to predetermined positions, for example, by welding etc., the sound-absorbing material 7 can be attached and detached. Specifically, it can be attached by sliding the sound absorbing material 7 from the outer peripheral side (right side in FIG. 3) to the inner peripheral side with respect to the frame body such as the partition plate 6 and the support frame 8, Further, the sound absorbing material 7 can be removed by sliding it so as to be pulled out toward the outer peripheral side.

Next, the operation of the silencer configured as described above will be described.
As shown in FIG. 1, the intake air is sucked in from the outer peripheral surface 4 side of the silencer 2, and the intake air is passed through the flow path between the sound absorbing elements 5 and flows out from the inner peripheral surface 3. When the intake air flows between the sound absorbing elements 5, the intake air flows so that the flow path width gradually becomes narrower. As shown in FIG. 3, at the downstream end of the sound absorbing element 5, the air flow is rectified by the rectifying unit 9 as indicated by an arrow 40. When the intake air flows between the sound absorbing elements 5, the noise generated from the intake air is absorbed by the sound absorbing material 7 provided inside the sound absorbing elements 5.

According to this embodiment, there exist the following effects.
As shown in FIG. 3, it is possible to attach and remove the sound absorbing material 7 even after the frame body such as the support frame 8 of the sound absorbing element 5 is installed by using a fixing portion for welding (not shown) by, for example, welding. It has become. As a result, foreign matter such as slag generated during welding after removing the sound absorbing material 7 can be removed by cleaning. Since the cleaning is performed so that slag generated during welding does not remain in the sound absorbing element 5, it is possible to prevent the impeller of the supercharger from being damaged.
Moreover, even if the sound absorbing material 7 inside the sound absorbing element 5 is soiled, the sound absorbing material 7 can be easily replaced because it has a simple structure that can be attached and detached.
Furthermore, since the sound absorbing material 7 inside the sound absorbing element 5 has a flat plate shape, it does not require special processing, so that production is easy and a commercially available sound absorbing material 7 can be used.

The sound-absorbing element 5 is provided with a rectifying unit 9 that is tapered toward the downstream side, and by rectifying the air flow, generation of a wake can be prevented and noise can be further reduced.
In addition, since the sound absorbing element 5 is installed at a predetermined interval in the tangential direction of the inner peripheral surface 3, the contact surface between the intake air and the sound absorbing element 5 can be enlarged, and a high sound deadening effect can be achieved with a simple structure. Can be obtained.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. 4 or FIG.
In the present embodiment, in addition to the silencer 2 shown in the first embodiment, a noise reduction effect can be further obtained by the plate-like second sound absorbing element 5a. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
As shown in FIG. 4, a substantially flat plate disposed between the sound absorbing elements 5 so as to be substantially parallel to the sound absorbing elements 5 and to extend from the outer peripheral surface 4 to a midway position in the radial direction. A second sound-absorbing element 5a having a shape is provided. By this second sound absorbing element 5a, the intake air from the outer peripheral surface 4 side can be divided, and the contact area with each of the sound absorbing elements 5, 5a is further increased.
The extending length of the second sound absorbing element 5a in the radial direction is preferably used as a half length with respect to the wavelength of the sound wave to be silenced, for example.

  According to the present embodiment, since the second sound absorbing element 5a is arranged between the sound absorbing elements 5, the flow path width 5d (see FIG. 5) between the sound absorbing elements 5, 5a can be adjusted. As a result, it is possible to tune to a necessary mute target frequency. Moreover, the silencing effect can be further obtained by setting the length of the sound absorbing element 5 to a half length with respect to the wavelength of the silencing target sound wave.

  Moreover, since the sound that has entered one flow path can be divided into a plurality of parts by the second sound absorbing element 5a, the sound waves generated in the flow path 5b and the flow path 5c separated by the second sound absorbing element 5a are on the downstream side. The noise can be reduced by interference. Moreover, since the flow paths having different shapes such as the flow path 5b and the flow path 5c are formed by installing the second sound absorbing element 5a, it is possible to mute sounds having different frequencies.

2 silencer 3 inner peripheral surface 4 outer peripheral surface 5 sound absorbing element 5a second sound absorbing element 5b flow path 5c flow path 6 partition plate 7 sound absorbing material 8 support frame 9 rectifier 10 supercharger 24 intake air introduction path 26 inlet

Claims (5)

A supercharger silencer that sucks air from an outer peripheral surface that is a cylindrical surface, and supplies the air from the inner peripheral surface that is a cylindrical surface to the intake port of the turbocharger,
A plurality of substantially flat plate-shaped sound-absorbing elements provided so as to be in contact with the inner peripheral surface and extend from the inner peripheral surface to the outer peripheral surface in a tangential direction are provided at a predetermined interval,
Each of the sound absorbing elements is
A sound-absorbing material having a substantially flat plate shape;
Is attachable by inserting a sound absorbing material is slid from the outer peripheral surface side in a state of being fixed to a predetermined position, it is removable by sliding toward the sound absorbing material on the outer peripheral surface, A frame that supports the sound absorbing material in the extending direction of the sound absorbing element;
A turbocharger silencer comprising:   Between each of the sound absorbing elements, there is provided a substantially flat plate-shaped second sound absorbing element disposed so as to be substantially parallel to the sound absorbing elements and to extend from the outer peripheral surface to a middle position in the radial direction. The supercharger muffler according to claim 1, wherein A supercharger silencer that sucks air from an outer peripheral surface that is a cylindrical surface, and supplies the air from the inner peripheral surface that is a cylindrical surface to the intake port of the turbocharger,
A plurality of substantially flat sound-absorbing elements provided so as to be in contact with the inner peripheral surface and extend to the outer peripheral surface are provided at a predetermined interval,
Each of the sound absorbing elements includes a sound absorbing material having a substantially flat plate shape, and a frame body in which the sound absorbing material can be inserted from the outer peripheral surface side and supported in the extending direction of the sound absorbing element ,
Between each of the sound absorbing elements, a substantially flat plate-shaped first plate is disposed so as to be substantially parallel to the sound absorbing elements and extend from the outer peripheral surface on the air suction side to a midway position in the radial direction. 2. A supercharger silencer comprising two sound absorbing elements . The supercharger silencer according to any one of claims 1 to 3, wherein a rectifying portion tapered toward the downstream side is provided at a downstream end of the sound absorbing element. A supercharger, wherein the supercharger silencing device according to any one of claims 1 to 4 is provided at a suction port.

Images