JP2011236805A - Silencer and supercharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact silencer and a supercharger for securing sufficient silencing performance.SOLUTION: The silencer 5 includes an annular first wall part 57a projecting toward a closing part 53 from a discharge port 54 side at the inside in the radial direction of an annular part 52 and adjusting the direction of a flow G of gas to the closing part 53 side, an annular second wall part 57b connected to an end part on the closing part 53 side of the first wall part 57a and a peripheral edge part of a discharge port 54 and adjusting the direction of the flow G of the gas whose flow direction is adjusted by the first wall part 57a to the discharge port 54 side, and sound absorbing materials 57d and 57e arranged over the first wall part 57a and the second wall part 57b.

Description

 The present invention relates to a silencer and a supercharger.

 2. Description of the Related Art There is known a supercharger that converts flow energy of combustion gas discharged from an internal combustion engine into a rotational driving force and supplies compressed air using the rotational driving force to the internal combustion engine. Such a supercharger is provided with a compression unit that sucks external air from the air inlet and compresses it. A silencer for attenuating noise generated in the compression unit as shown in Patent Document 1, for example, is connected to the intake port side of the compression unit. The silencer includes an annular portion having an inflow portion into which air flows in, an annular portion, a closed portion that closes an opening on one side in the central axis direction of the annular portion, and the other side in the central axis direction And an exhaust port through which air is exhausted, and attenuates sound entering from the exhaust port. In addition, the discharge port of the silencer is provided at a position communicating with the suction port of the compression unit. A sound absorbing material that absorbs and attenuates sound is installed inside the silencer, and the sound that enters from the discharge port is attenuated by the sound absorbing action of the sound absorbing material.

 A silencer having a configuration different from the silencer shown in Patent Document 1 is also known. Such a silencer includes an adjusting unit (a so-called reversing unit) that adjusts the direction of the flow of air that has flowed in to the closing portion side and then adjusts the direction to the discharge port side. The adjustment portion is provided so as to protrude from the discharge port side toward the closing portion on the radially inner side of the annular portion, and is formed in an annular shape surrounding the discharge port. A sound-absorbing material is installed on the inner side in the radial direction of the adjustment portion, and the sound entering from the discharge port can be effectively attenuated.

JP 2008-202436 A

 By the way, in order to reduce the installation space of the supercharger, there is a case where it is required to reduce the size of the supercharger. And it is requested | required of a silencer to shorten the length in a center axis direction especially. However, if the length of the silencer in the central axis direction is shortened, the amount of the sound absorbing material installed inside the silencer decreases, so the silencer performance of the silencer decreases, and sufficient silencer performance cannot be ensured. There was a fear.

 The present invention has been made in consideration of the above points, and an object of the present invention is to provide a silencer and a supercharger that can ensure sufficient silencing performance even if the silencer is downsized.

In order to solve the above problems, the present invention employs the following means.
The silencer according to the present invention includes an annular portion having an inflow portion into which gas flows in, an annular portion, a closing portion that closes an opening on one side in the central axial direction of the annular portion, and a central axial direction A muffler for attenuating the sound entering from the discharge port, and projecting from the discharge port side toward the closing portion on the radially inner side of the annular portion Provided in connection with each of the annular first wall portion that adjusts the direction of the flow of the introduced gas to the closing portion side, the end portion of the first wall portion on the closing portion side, and the peripheral portion of the discharge port. An annular second wall portion that adjusts the flow direction of the gas, the flow direction of which is adjusted by the first wall portion, to the discharge port side; and a sound absorbing material provided across the first wall portion and the second wall portion; The structure of comprising is adopted.
According to the present invention, the sound absorbing material is provided across the first wall portion and the second wall portion, and the number of places where the sound absorbing material is installed in the silencer is increased as compared with the prior art.

In the silencer according to the present invention, the first wall portion and the second wall portion form an accommodation space on the opposite side of the space through which the gas flowing in from the inflow portion flows, and communicate the space and the accommodation space. A configuration is adopted in which a hole is provided and the sound absorbing material is provided in the accommodation space.
According to the present invention, the sound in the space is absorbed by the sound absorbing material through the communication hole formed in the first wall portion and the second wall portion. Moreover, since the 1st wall part and the 2nd wall part are provided between the sound-absorbing material and the said space, damage to the sound-absorbing material due to the flow of gas flowing in from the inflow part is suppressed.

Moreover, the silencer according to the present invention employs a configuration including a second sound absorbing material provided in a part of the annular portion on the radially inner side.
According to the present invention, since the second sound absorbing material is provided in the annular portion, the amount of the sound absorbing material installed in the silencer is increased as compared with the prior art.

The silencer according to the present invention employs a configuration in which the second sound absorbing material is provided on the closed portion side of the annular portion.
The closed portion side of the annular portion is a portion that can be reached only by slightly diffracting the sound entering from the discharge port. That is, the volume reaching the closed portion side of the annular portion is large. According to the present invention, since the second sound absorbing material is installed in this portion, the sound entering from the outlet is efficiently absorbed.

In addition, the silencer according to the present invention employs a configuration in which the second sound absorbing material is provided at least in a range where the first wall portion and the second wall portion are not arranged in the central axis direction.
According to the present invention, the sound traveling outward in the radial direction is easily absorbed by at least one of the sound absorbing material and the second sound absorbing material, so that the sound entering from the outlet is efficiently absorbed.

 In addition, a supercharger according to the present invention includes a turbine unit that converts flow energy of combustion gas discharged from an internal combustion engine into a rotational driving force, and an internal combustion engine that is driven by the rotational driving force of the turbine unit and compresses the gas. The compressor is provided with a compression unit that supplies gas to the compression unit, and adopts a configuration in which gas flows into the compression unit via the silencer according to any one of claims 1 to 5.

According to the present invention, the following effects can be obtained.
According to the present invention, the number of places where the sound absorbing material is installed in the silencer is increased compared to the conventional one. Therefore, if the silencer has the same outer shape, the silencer performance can be improved as compared with the conventional one. Therefore, even if the silencer is reduced in size, the amount of the sound absorbing material to be installed can be made the same level as before, and there is an effect that a sufficient silencing performance can be secured.

1 is a vertical sectional view showing a schematic configuration of a supercharger according to a first embodiment of the present invention. It is the vertical sectional view which expanded the silencer in FIG. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. It is a graph which shows the result of having compared the silencing performance with the conventional silencer and the silencer in 1st Embodiment, and shows the measurement result of the sound pressure in the reverse side of the compressor part which pinched | interposed the obstruction | occlusion part. It is a graph which shows the result of having compared the silencing performance by the conventional silencer and the silencer in 1st Embodiment, and shows the measurement result of the sound pressure in the radial direction outer side position of an annular part. It is a vertical sectional view showing the structure of the silencer in the second embodiment of the present invention. It is a vertical sectional view showing the configuration of the silencer in the third embodiment of the present invention.

 Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 7. In each drawing used for the following description, the scale of each member is appropriately changed to make each member a recognizable size.

[First Embodiment]
FIG. 1 is a vertical sectional view showing a schematic configuration of a supercharger 1 in the present embodiment.
The supercharger 1 converts the flow energy of combustion gas discharged from an internal combustion engine (not shown) into a rotational driving force, and supplies the compressed air to the internal combustion engine using the rotational driving force. This improves the performance (output, fuel consumption, etc.). As shown in FIG. 1, the supercharger 1 includes a turbine unit 2, a bearing unit 3, a compressor unit 4 (compression unit), and a silencer 5. The turbine part 2, the bearing part 3, the compressor part 4, and the silencer 5 are connected side by side in one direction.

 The turbine unit 2 converts the flow energy of the combustion gas discharged from the internal combustion engine into a rotational driving force. The turbine section 2 includes a turbine impeller 21 that is a rotating blade that rotates in response to the flow of combustion gas, a turbine scroll chamber 22 that is provided around the rotation axis of the turbine impeller 21, and a bearing section that sandwiches the turbine impeller 21. 3 and a turbine part discharge port 23 through which combustion gas is discharged. The turbine scroll chamber 22 and the turbine part discharge port 23 are formed in the turbine casing 24.

 The bearing unit 3 rotatably supports a rotating shaft 31 fixed to the turbine impeller 21. The rotating shaft 31 is a shaft member that extends in the connecting direction of the turbine section 2 and the bearing section 3, and is rotatably supported by the bearing casing 33 via a bearing 32. Lubricating oil for lubrication is supplied to the bearing 32. Although the slide bearing is used for the bearing 32 of this embodiment, a rolling bearing may be used, for example.

 The compressor unit 4 is driven by the rotational driving force of the turbine unit 2 transmitted via the rotating shaft 31, compresses air, and supplies the compressed air to an internal combustion engine (not shown). The compressor unit 4 includes a compressor impeller 41, a compressor unit suction port 42, a diffuser 43, and a compressor scroll chamber 44.

 The compressor impeller 41 is a rotary blade fixed to the rotary shaft 31 and sends out air sucked from the outside by the rotation to the outside in the radial direction. The compressor section inlet 42 is provided on the opposite side of the bearing section 3 with the compressor impeller 41 interposed therebetween, and is an inlet of air sucked toward the compressor impeller 41. The diffuser 43 is an annular flow path that is provided around the rotation axis of the compressor impeller 41, and is a flow path that compresses and pressurizes the air sent out by the rotation of the compressor impeller 41. The compressor scroll chamber 44 is an annular flow path provided so as to surround the compressor impeller 41 around its rotation axis, and is provided in communication with the diffuser 43 to introduce compressed air and to an internal combustion engine (not shown). It is a flow path for sending out the compressed air toward.

 The compressor section inlet 42 and the compressor scroll chamber 44 are formed in the compressor casing 45, and the diffuser 43 is formed between the compressor casing 45 and the seal plate 46. The seal plate 46 is a member for preventing the lubricating oil supplied to the bearing 32 from flowing into the compressor impeller 41 side, and is a disk-shaped member for connecting the compressor casing 45 and the bearing casing 33 to each other. It is.

 The silencer 5 attenuates the sound that enters inside the compressor unit 4 and enters through the compressor unit inlet 42 while the air flowing in from the outside flows inside and is discharged toward the compressor unit inlet 42. It is. The silencer 5 has an inflow portion 51 into which air flows in, an annular portion 52 formed in an annular shape around the axis of the rotary shaft 31, and an opening on the opposite side of the compressor portion 4 in the central axis L direction of the annular portion 52. A back plate 55 having a closing portion 53 for closing the portion and a discharge port 54 through which air is discharged toward the compressor portion 4 in the direction of the central axis L and connected to the opposite side of the closing portion 53 of the annular portion 52. And. The silencer 5 is connected to the compressor unit 4 at a position where the discharge port 54 communicates with the compressor unit suction port 42. The back plate 55 is a plate member formed in an annular shape. Inside the silencer 5, there is provided a space 56 that is surrounded by the annular portion 52, the closing portion 53, and the back plate 55 and is a space in which air flowing from the inflow portion 51 flows. In addition, the silencer 5 in this embodiment is formed shorter in the central axis L direction than the conventional silencer. Therefore, the supercharger 1 including the silencer 5 is downsized.

Subsequently, the silencer 5 including the characteristic portion of the present embodiment will be described in more detail.
FIG. 2 is an enlarged vertical sectional view of the silencer 5 in FIG. 3 is a cross-sectional view taken along line AA in FIG.
As shown in FIGS. 2 and 3, the annular portion 52 includes an annular plate 52a and a filter 52b. The annular plate 52a is a cylindrical member formed in an annular shape around the axis of the rotation shaft 31 (see FIG. 1). The annular plate 52a is formed by annularly bending a plate member (so-called punching plate) in which a plurality of holes penetrating in the plate thickness direction is formed. The filter 52b is a sponge-like filter member that removes dust in the air by allowing air to flow therein. The filter 52b is bonded to the outer peripheral surface of the annular plate 52a using an adhesive or the like, and is provided at a position that covers at least all of the plurality of holes of the annular plate 52a. The inflow portion 51 through which external air flows into the space 56 is formed by an annular plate 52a having a plurality of holes and a filter 52b. Further, the annular portion 52 is formed to have a shorter length in the direction of the central axis L than the annular portion in the conventional silencer.

 The closing part 53 includes a closing plate 53a and a closing part sound absorbing material 53b. The closing plate 53a is a disk-like member that is joined to the annular plate 52a by rivets, welding, or the like, and closes the opening on one side in the central axis L direction of the annular plate 52a. The closing portion sound absorbing material 53b is a felt material that absorbs and attenuates the sound in the space 56. The closing portion sound absorbing material 53b is bonded to the surface facing the space 56 of the closing plate 53a with an adhesive. Further, a plurality of rivets 53c are provided to sandwich the closing plate 53a and the closing portion sound absorbing material 53b and reinforce their adhesive strength.

The back plate 55 is joined to the opposite side of the closed portion 53 in the central axis L direction in the annular plate 52a by rivets, welding or the like. The back plate 55 has a discharge port 54 at the center thereof, and the discharge port 54 is formed around the central axis L.
The rear plate 55 is provided with an annular adjustment portion 57 that protrudes from the rear plate 55 toward the closing portion 53 on the radially inner side of the annular portion 52. The adjusting portion 57 is provided at a position surrounding the discharge port 54, and adjusts the direction of the air flow G flowing in from the inflow portion 51 to the closing portion 53 side, and then adjusts to the discharge port 54 side.

Note that the width of the flow path through which the air flowing in from the inflow portion 51 flows is the narrowest between the end portion of the adjustment portion 57 on the closing portion 53 side and the closing portion 53. The flow path area S between the end of the adjusting portion 57 and the closing portion 53 is a distance H between the end of the adjusting portion 57 and the closing portion 53 in the direction of the center axis L, and the distance H from the center axis L. When the distance in the radial direction to the end of the adjustment portion 57 is a radius R, it is expressed by the following equation.
S = 2πRH (1)
As described above, the silencer 5 in the present embodiment is formed to have a shorter length in the direction of the central axis L than the conventional silencer. For this reason, the width H is narrower than before and the flow path area S is also reduced, so that the flow resistance and pressure loss with respect to the air flowing in from the inflow portion 51 tend to increase. However, the end of the adjustment portion 57 in the present embodiment is provided at a position moved radially outward as compared with the conventional case, and the radius R is larger than that in the conventional case. As a result, the channel area S obtained by the equation (1) is about the same as the conventional one, and the flow resistance and pressure loss against the air are also suppressed to the same level as the conventional one.

The adjustment part 57 is formed of a first wall part 57a and a second wall part 57b. The first wall portion 57a is provided to protrude from the back plate 55 toward the closing portion 53 on the radially inner side of the annular portion 52, and adjusts the direction of the air flow G flowing in from the inflow portion 51 to the closing portion 53 side. An annular plate member. The first wall portion 57a is provided in parallel with the central axis L.
The second wall portion 57b is provided to be connected to each of the end portion of the first wall portion 57a on the closing portion 53 side and the peripheral portion of the discharge port 54, and the flow direction is adjusted by the first wall portion 57a. It is an annular plate member that adjusts the direction of the air flow G toward the outlet 54. The second wall portion 57b gradually increases in diameter toward the closing portion 53, and a cross-sectional shape on a predetermined surface including the central axis L is a shape bulging toward the space 56.
The first wall portion 57 a and the second wall portion 57 b form a housing space 58 on the opposite side of the space 56 and have a plurality of communication holes 57 c that allow the space 56 and the housing space 58 to communicate with each other. The first wall portion 57a and the second wall portion 57b are integrally formed from the same plate member (punching plate) by machining (sheet metal processing).

In the accommodation space 58, a first adjusting portion sound absorbing material 57d (sound absorbing material) and a second adjusting portion sound absorbing material 57e (sound absorbing material) are installed. The first adjusting portion sound absorbing material 57d and the second adjusting portion sound absorbing material 57e are felt materials that absorb and attenuate sound in the space 56. The first adjuster sound absorbing material 57d is bonded to the surface of the first wall 57a facing the accommodation space 58 with an adhesive. In addition, a plurality of rivets that sandwich the first wall portion 57a and the first adjusting portion sound absorbing material 57d and reinforce their adhesive strength are used. The second adjusting portion sound absorbing material 57e is bonded to the surface of the second wall portion 57b facing the accommodation space 58 with an adhesive. In addition, a plurality of rivets (not shown) that sandwich the second wall portion 57b and the second adjusting portion sound absorbing material 57e and reinforce their adhesive strength are used. In other words, the first adjusting portion sound absorbing material 57d and the second adjusting portion sound absorbing material 57e are provided across the first wall portion 57a and the second wall portion 57b. Therefore, in the silencer 5 in the present embodiment, the number of places where the sound absorbing material is installed is increased as compared with the prior art.
The first adjusting portion sound absorbing material 57d and the second adjusting portion sound absorbing material 57e are provided so as to face the space 56 at communication holes 57c formed in the first wall portion 57a and the second wall portion 57b. In the present embodiment, the first adjusting portion sound absorbing material 57d and the second adjusting portion sound absorbing material 57e are separately configured. However, the present invention is not limited to this, and the integrally formed sound absorbing material is the first. You may install over 1 wall part 57a and 2nd wall part 57b.

On the surface facing the space 56 of the back plate 55 between the annular portion 52 and the adjusting portion 57, an annular back plate sound absorbing material 55a that is a felt material that absorbs and attenuates the sound in the space 56 is provided. Yes. The back plate sound absorbing material 55a is bonded to the surface of the back plate 55 facing the accommodation space 58 with an adhesive. In addition, a plurality of rivets that sandwich the back plate 55 and the back plate sound absorbing material 55a and reinforce their adhesive strength are used.
A bracket 55 b is provided on the side opposite to the closing portion 53 of the back plate 55. The bracket 55b protrudes from the vicinity of the peripheral edge of the back plate 55 in parallel with the central axis L, and is used for connection with the compressor casing 45 (see FIG. 1). A bolt 55 c is used for connection with the compressor casing 45.

Next, the operation of the supercharger 1 in this embodiment will be described.
Combustion gas discharged from an internal combustion engine (not shown) flows into the turbine scroll chamber 22 of the turbine unit 2. The combustion gas flows into the turbine impeller 21 while rotating around the axis of the rotary shaft 31 in the turbine scroll chamber 22. The turbine impeller 21 is rotated by the inflow of the combustion gas, and the combustion gas is discharged to the outside of the supercharger 1 through the turbine part discharge port 23.
As the turbine impeller 21 rotates, the compressor impeller 41 connected and fixed via the rotating shaft 31 rotates. When the compressor impeller 41 rotates, the compressor section suction port 42 becomes negative pressure, and the space 56 communicating with the compressor section suction port 42 via the discharge port 54 also becomes negative pressure. Therefore, the air outside the silencer 5 flows into the space 56 through the inflow portion 51.

 The air flow G flowing in from the inflow portion 51 is adjusted by the adjusting portion 57. First, the direction of the air flow G is adjusted to the closing portion 53 side by the first wall portion 57a. Next, the direction of the air flow G adjusted by the first wall 57a is adjusted to the discharge port 54 side by the second wall 57b. By providing the adjusting unit 57, the flow path width in the space 56 is narrowed, and the flow velocity of the air flowing in the vicinity of the adjusting unit 57 increases. When the flow velocity of air rises, the surfaces of the first adjusting portion sound absorbing material 57d and the second adjusting portion sound absorbing material 57e provided in the adjusting portion 57 may be damaged. However, on the space 56 side of the first adjusting portion sound absorbing material 57d and the second adjusting portion sound absorbing material 57e, a first wall portion 57a and a second wall portion 57b having a plurality of communication holes are respectively provided. For this reason, the first adjusting portion sound absorbing material 57d and the second adjusting portion sound absorbing material 57e can be protected by the first wall portion 57a and the second wall portion 57b, and their damage can be prevented / suppressed. The air flowing in from the inflow portion 51 flows through the space 56 and is then discharged from the discharge port 54 toward the compressor portion suction port 42.

By the way, for example, rotation of the compressor impeller 41 generates sound (noise) from the inside of the compressor unit 4. The generated sound enters the space 56 from the outlet 54 of the silencer 5. The sound travels while being reflected and diffracted in the space 56 and is attenuated by being absorbed by the closing portion sound absorbing material 53b, the first adjusting portion sound absorbing material 57d, the second adjusting portion sound absorbing material 57e, and the back plate sound absorbing material 55a. The sound that the silencer 5 enters from the outlet 54 can be attenuated by the absorbing action of the sound absorbing material with respect to the sound. The first adjusting portion sound absorbing material 57d and the second adjusting portion sound absorbing material 57e are provided across the first wall portion 57a and the second wall portion 57b, and the sound absorbing material is installed in more places than before. Has been. Therefore, even if the length of the silencer 5 in the direction of the central axis L is shortened, the amount of the sound absorbing material is increased by installing the sound absorbing material in more places, and the sound deadening performance of the silencer 5 is reduced. It can be prevented / suppressed. In the present embodiment, since the back plate sound absorbing material 55a is also provided, the amount of the sound absorbing material can be further increased.
In addition, although the 1st adjustment part sound-absorbing material 57d and the backplate sound-absorbing material 55a are provided in the position where the sound which enters from the discharge port 54 cannot reach easily, the present inventors are sound-absorbing materials in any position in the silencer 5. As long as it is installed, knowledge has been obtained that a sound absorbing effect can be obtained, and the first adjusting portion sound absorbing material 57d and the back plate sound absorbing material 55a also sufficiently function as a sound absorbing material.

The air discharged from the discharge port 54 flows into the compressor impeller 41 through the compressor unit suction port 42. As the compressor impeller 41 rotates, the air is sent out radially outward and flows into the diffuser 43. Air is compressed by the diffuser 43, and the compressed air is supplied to an internal combustion engine (not shown) via the compressor scroll chamber 44. By supplying compressed air, the performance (output, fuel consumption, etc.) of the internal combustion engine can be improved.
Thus, the operation of the supercharger 1 is completed.

Next, a comparison result of the silencing performance between the silencer 5 and the conventional silencer whose length in the central axis L direction is longer than that of the silencer 5 will be described with reference to FIGS. 4 and 5.
FIG. 4 shows the result of comparing the silencing performance between the conventional silencer and the silencer 5 of the present embodiment. The sound pressure [dB (A It is a graph which shows the measurement result of]). FIG. 5 shows the result of comparing the silencing performance between the conventional silencer and the silencer 5 of the present embodiment. The sound pressure [dB (A) at the radially outer position of the annular portion 52 is shown. It is a graph which shows the measurement result of]. 4 and 5, the horizontal axis indicates the pressure ratio [times] between the compressor section suction port 42 side and the compressor scroll chamber 44 side. Since the pressure ratio increases as it proceeds to the right side of the drawing, it indicates that the rotation speed of the compressor impeller 41 on the right side of the drawing is higher than that on the left side of the drawing.

 As shown in FIG. 4, in the comparison of the sound pressure on the opposite side of the compressor unit 4 across the blocking unit 53, the silencer 5 in the present embodiment has a silencing performance of almost the same level as a conventional silencer. ing. Further, as shown in FIG. 5, in the comparison of the sound pressure at the radially outer position of the annular portion 52, the silencer 5 in the present embodiment has a silencing performance similar to that of a conventional silencer. For this reason, it has been found that the silencer 5 of the present embodiment has a sufficient silencer performance.

Therefore, according to the present embodiment, the following effects can be obtained.
According to the present embodiment, the number of places where the sound absorbing material is installed in the silencer is increased compared to the conventional one. Therefore, if the silencer has the same external shape, the silencing performance can be improved as compared with the conventional one. Therefore, even in the silencer 5 in which the conventional silencer is miniaturized, the amount of the sound absorbing material to be installed can be set to the same level as the conventional one, and there is an effect that sufficient silencing performance can be ensured.

[Second Embodiment]
The silencer 5A in the present embodiment will be described with reference to FIG.
FIG. 6 is a vertical cross-sectional view showing the configuration of the silencer 5A in the present embodiment. In FIG. 6, the same components as those of the first embodiment shown in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted.
The silencer 5 </ b> A is connected to the compressor section suction port 42 side of the compressor section 4 in the supercharger 1 and attenuates the sound that enters through the compressor section suction port 42, as with the silencer 5 in the first embodiment. Is.

The annular part 52 in the silencer 5A has an annular part sound absorbing material 52c (second sound absorbing material). That is, the silencer 5A has a configuration in which an annular sound absorbing material 52c is added to the silencer 5 in the first embodiment. The annular portion sound-absorbing material 52c is provided on the radially inner surface of the annular plate 52a in the circumferential direction, and is disposed on the closed portion 53 side in the central axis L direction. The annular portion sound absorbing material 52 c is a felt material that absorbs and attenuates the sound in the space 56. The annular portion sound absorbing material 52c is bonded to the radially inner surface of the annular plate 52a with an adhesive. A plurality of rivets are provided to sandwich the annular plate 52a and the annular portion sound absorbing material 52c and reinforce their adhesive strength.
The annular portion sound absorbing material 52c is provided in a non-installation range 52d of the adjusting portion 57 (that is, the first wall portion 57a and the second wall portion 57b) in the direction of the central axis L in the annular plate 52a. Therefore, when the sound advances radially outward in the space 56, the sound is easily absorbed by at least one of the second adjusting portion sound absorbing material 57e and the annular portion sound absorbing material 52c. Can be increased. Note that a through hole penetrating in the plate thickness direction is not formed in the portion of the annular plate 52a where the annular portion sound absorbing material 52c is provided.

 Further, when the flow resistance of the air passing through the inflow portion 51 is excessively increased by providing the annular portion sound absorbing material 52c, the installation region of the annular portion sound absorbing material 52c may be appropriately adjusted within the range 52d. Also in this case, the annular portion sound absorbing material 52c is preferably provided on the closing portion 53 side. The closed portion 53 side of the annular portion 52 is a portion that can be reached only by slightly diffracting sound entering from the discharge port 54. That is, the volume reaching the closed portion 53 side of the annular portion 52 is large. By installing the annular portion sound absorbing material 52c in this portion, the sound entering from the discharge port 54 is efficiently absorbed by the annular portion sound absorbing material 52c.

Therefore, according to the present embodiment, the following effects can be obtained.
According to the present embodiment, the silencer 5A has a configuration in which the annular portion sound absorbing material 52c is added to the silencer 5 in the first embodiment, so that a higher silencing effect than the silencer 5 is achieved. Is effective.

[Third Embodiment]
The silencer 5B in the present embodiment will be described with reference to FIG.
FIG. 7 is a vertical cross-sectional view showing the configuration of the silencer 5B in the present embodiment. In FIG. 7, the same components as those of the first embodiment shown in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted.
Similarly to the silencer 5 in the first embodiment, the silencer 5B is connected to the compressor part inlet 42 side of the compressor part 4 in the supercharger 1, and attenuates sound that enters through the compressor part inlet 42. Is.

 The back plate 55 in the present embodiment is provided with an annular adjustment portion 57 </ b> A that protrudes from the back plate 55 toward the closing portion 53 on the radially inner side of the annular portion 52. The adjustment portion 57A is provided at a position surrounding the discharge port 54, and adjusts the flow direction of the air flowing in from the inflow portion 51 to the closing portion 53 side, and then adjusts to the discharge port 54 side.

The adjustment portion 57A is formed of a first wall portion 57f and a second wall portion 57g. The first wall portion 57f is provided on the radially inner side of the annular portion 52 so as to protrude from the back plate 55 toward the closing portion 53, and adjusts the direction of the air flowing in from the inflow portion 51 toward the closing portion 53. It is a member. The first wall portion 57f has a shape that gradually decreases in diameter toward the closing portion 53, and is formed by machining a plate member (sheet metal processing). Therefore, compared with the silencer 5 in the first embodiment, the flow resistance of air flowing from the inflow portion 51 is reduced, and the amount of pressure loss is reduced.
The second wall portion 57g is provided to be connected to each of the end portion of the first wall portion 57f on the closing portion 53 side and the peripheral edge portion of the discharge port 54, and the flow direction is adjusted by the first wall portion 57f. It is an annular member that adjusts the direction of air flow toward the outlet 54. The second wall portion 57g gradually increases in diameter toward the closing portion 53, and a cross-sectional shape on a predetermined surface including the central axis L is a shape bulging toward the space 56.
The first wall portion 57f and the second wall portion 57g form a storage space (not shown) on the opposite side of the space 56 and have a plurality of communication holes 57c that allow the space 56 and the storage space to communicate with each other. The first wall portion 57f and the second wall portion 57g are integrally formed from the same plate member (punching plate) by machining (sheet metal processing).

 The accommodation space is filled with a third adjuster sound absorbing material 57h (sound absorbing material). That is, the third adjusting portion sound absorbing material 57h is provided across the first wall portion 57f and the second wall portion 57g. The third adjuster sound absorbing material 57h is a felt material that absorbs and attenuates the sound in the space 56. The third adjusting portion sound absorbing material 57h is a portion of the communication hole 57c formed in the first wall portion 57f and the second wall portion 57g, and is provided facing the space 56.

Therefore, according to the present embodiment, the following effects can be obtained.
Since the first wall portion 57f has a shape that gradually decreases in diameter toward the closing portion 53, the flow resistance of air flowing in from the inflow portion 51 is reduced as compared with the silencer 5 in the first embodiment. The amount of pressure loss is reduced. Therefore, according to the present embodiment, there is an effect that the compression performance and the like of the compressor unit 4 can be further improved as compared with the first embodiment.

 As described above, the preferred embodiments according to the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the examples. Various shapes, combinations, and the like of the constituent members shown in the above-described examples are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

For example, in the above embodiment, the annular part sound absorbing material 52c, the closing part sound absorbing material 53b, the back plate sound absorbing material 55a, the first adjusting part sound absorbing material 57d, the second adjusting part sound absorbing material 57e, and the third adjusting part sound absorbing material 57h However, the present invention is not limited to this, and a sound absorbing material using a resin material such as a foamed urethane material or a foamed rubber material may be used.
Further, since the sound absorbing material made of such a resin material has higher durability against flowing air than the felt material, the first adjusting portion sound absorbing material 57d and the second adjusting portion sound absorbing material 57e are replaced with the first adjusting portion sound absorbing material 57e. You may install in the surface at the side of the space 56 of the 1st wall part 57a 2nd wall part 57b.

 In addition, the annular portion sound absorbing material 52c, the closing portion sound absorbing material 53b, the back plate sound absorbing material 55a, the first adjusting portion sound absorbing material 57d, and the second adjusting portion sound absorbing material 57e in the above embodiment are bonded using an adhesive and a rivet. -Although it is joined, it is not limited to this, You may use another adhesion | attachment and joining method.

 Moreover, you may provide the board member (punching board) which has a several through-hole in the space 56 side of the obstruction | occlusion part sound absorption material 53b in the said embodiment. By providing such a plate member, it is possible to prevent / suppress damage to the blocking portion sound absorbing material 53b from flowing air.

 Moreover, although the silencer 5, 5A, 5B in the said embodiment is all provided in the supercharger 1, it is not limited to this, For example, the structure installed in the suction inlet side of a centrifugal compressor It may be.

DESCRIPTION OF SYMBOLS 1 ... Supercharger, 2 ... Turbine part, 4 ... Compressor part (compression part), 5, 5A, 5B ... Silencer, 51 ... Inflow part, 52 ... Ring part, 52c ... Ring part sound-absorbing material (2nd sound-absorbing material) ), 52d ... range, 53 ... blocking portion, 54 ... discharge port, 56 ... space, 57a, 57f ... first wall portion, 57b, 57g ... second wall portion, 57c ... communication hole, 57d ... first adjusting portion sound absorption Material (sound absorbing material), 57e ... second adjusting part sound absorbing material (sound absorbing material), 57h ... third adjusting part sound absorbing material (sound absorbing material), 58 ... accommodating space, L ... center axis,

Claims (6)

An annular portion having an inflow portion into which gas flows in and formed in an annular shape, a closing portion that closes an opening on one side in the central axis direction of the annular portion, and toward the other side in the central axis direction A silencer comprising an exhaust port through which the gas is exhausted, and attenuating sound entering from the exhaust port,
An annular first wall portion that protrudes from the discharge port side toward the closing portion on the radially inner side of the annular portion, and adjusts the flow direction of the gas that has flowed into the closing portion side;
The direction of the flow of the gas, which is provided to be connected to each of the end portion of the first wall portion on the closing portion side and the peripheral portion of the discharge port, and whose flow direction is adjusted by the first wall portion. An annular second wall that adjusts to the outlet side;
A silencer comprising: a sound absorbing material provided across the first wall portion and the second wall portion. The silencer according to claim 1,
The first wall portion and the second wall portion have a communication hole that forms an accommodation space on the opposite side of the space through which the gas flowing in from the inflow portion flows, and communicates the space with the accommodation space. ,
The sound absorber is provided in the accommodation space. The muffler according to claim 1 or 2,
A muffler comprising a second sound absorbing material provided at a part of the annular portion on the radially inner side. The silencer according to claim 3,
The muffler, wherein the second sound absorbing material is provided on the closed portion side of the annular portion. The muffler according to claim 3 or 4,
The muffler, wherein the second sound absorbing material is provided at least in a range where the first wall portion and the second wall portion are not arranged in the central axis direction. A turbocharger comprising: a turbine portion that converts flow energy of combustion gas discharged from an internal combustion engine into a rotational driving force; and a compression portion that is driven by the rotational driving force of the turbine portion to compress gas and supply the compressed internal gas to the internal combustion engine Machine,
The supercharger, wherein the gas flows into the compression section via the silencer according to any one of claims 1 to 5.

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