JP6147777B2 - Intake rectifier, compressor provided with the same - Google Patents

Description

  The present invention relates to an intake air rectifier and a compressor including the same.

  Patent Document 1 discloses a supercharger that includes a compressor and a filter (intake silencer) connected to the intake air inlet passage side of the compressor.

JP 2014-111905 A

  In the intake passage at the connecting portion between the compressor and the filter, the flow of the intake air is converted from the radial direction of the supercharger to the direction along the rotor shaft, and thus a swirling vortex flow is generated at this position. Therefore, it has been studied to arrange the flow of the intake air by providing a funnel-shaped flow guide in the intake air introduction path at the connection portion between the compressor and the filter.

  However, since the intake air introduction path of the compressor has a different inner diameter depending on the turbocharger specifications, there is a possibility that a step or a gap may be formed between the intake passages at the connection portion with the filter, which may impair the intake performance. there were.

  Therefore, in order to obtain better intake performance, as shown in FIG. 6, an exclusive flow guide 104 is interposed between the intake silencer 101 and the intake passage 103 of the compressor 102, whereby intake air from the intake silencer 101. The flow to the passage 103 is arranged. By forming the flow guide 104 by casting, the curvature of the inner peripheral surface can be freely set, and the flow guide 104 can be adapted to the supercharger specifications.

  However, since the flow guide 104 has a large length in the axial direction and is made of cast metal, and has a thickness of about 12 to 20 mm and is heavy, the supercharger (compressor 102) is opened and assembled. The workability in etc. was bad.

  In addition, as described above, several types of casting flow guides 104 must be manufactured in accordance with the specifications of the supercharger, so that not only a large space is required for storage as spare parts, but also casting is performed. Therefore, it is necessary to prepare several kinds of large wooden molds, and there is a problem that the storage space and management are very expensive.

  The present invention has been made in view of such circumstances, and has a structure that is compact, lightweight, and easy to manufacture, and matches the shape of the flow path from the intake silencer to the compressor intake passage to the specifications of the turbocharger. It is an object of the present invention to provide an intake air rectifier that can be appropriately selected and a compressor including the intake rectifier.

  In order to solve the above problems, the present invention employs the following means.

That is, the intake rectifier according to the present invention is provided in an intake passage between a compressor in a supercharger and an intake silencer connected to an intake gas inlet side of the compressor, and is provided in the intake silencer. together is, the flow guide and the inner diameter is reduced from the intake silencer side to the compressor side, Oite between the flow guide and the compressor, it is detachably fixed to the compressor, the flow guide and A cover ring connecting between the intake passage and an inner diameter of the end portion of the cover ring on the intake silencer side is the same as an inner diameter of the end portion of the flow guide. The inner diameter of the end portion is the same as the inner diameter of the inner peripheral surface of the intake passage, and the inner peripheral surface of the flow guide and the intake air Wherein the space between tip inner peripheral surface of the road is connected via the inner peripheral surface of the cover ring.

  According to the intake rectifier having the above configuration, the gas that has passed through the silencer element inside the intake silencer passes through the flow guide provided in the intake silencer and the cover ring connected to the downstream side thereof, and is then rectified. Is sucked into the intake passage. The above rectifying action can be appropriately changed according to the specifications of the supercharger by replacing the cover ring with a different shape.

  Since the cover ring is connected to the downstream side of the flow guide provided in the intake silencer to form a flow path, as a member of the intake rectifier that is changed according to the specifications of the supercharger, the conventional casting Like a made flow guide, it is smaller and lighter than a large and heavy one that is integrally connected from the intake silencer to the intake passage of the compressor.

Therefore, workability at the time of opening and assembling of the supercharger (compressor) can be improved.
Further, the miniaturized cover ring does not require a large space in its storage location. For this reason, a large number of cover rings can be prepared and appropriately selected according to the specifications of the supercharger.
Furthermore, even if the cover ring is manufactured by casting, the wooden mold is reduced in size, so that the wooden mold can be easily stored.

Thus, the small, lightweight, and easy-to-manufacture structure makes it possible to appropriately select the flow path shape from the intake silencer to the compressor intake path in accordance with the supercharger specifications.
The said structure WHEREIN: According to the internal shape of the said intake passage which changes with specifications of the said supercharger, the said cover ring is good also as replacement | exchange to the thing from which the internal diameter by the side of the said intake passage differs. This eliminates the need to change the flow guide of the intake silencer in accordance with the supercharger specifications.

  The said structure WHEREIN: It is good to provide a clearance gap between the terminal part of the said flow guide, and the front-end | tip part of the said cover ring.

  The cover ring is preferably manufactured by casting with excellent manufacturability, but there is a concern that dimensional errors may occur due to casting, so by providing a gap with the flow guide as described above, especially when installing an intake silencer An error in the axial position can be allowed.

  The said structure WHEREIN: A level | step difference may be formed in the edge part by the side of the said intake silencer of the said cover ring, and the terminal part of the said flow guide may be fitted to the said level | step difference.

  By forming such a step at the end of the cover ring on the intake silencer side and fitting the end portion of the flow guide, the cross section of the gap between the flow guide and the cover ring is refracted. For this reason, it becomes difficult for gas to pass through this clearance gap, and it can prevent that the disturbance of an air current, ie, the performance fall of a supercharger, occurs.

  In addition, since the flow guide and cover ring are fitted together, the intake silencer can be positioned by fitting the flow guide into the cover ring when installing the intake silencer to the compressor, making it easy to install the intake silencer. can do.

  In the above configuration, the flow guide is preferably formed of a metal plate and integrated with the intake silencer.

  With the above configuration, the weight of the flow guide can be drastically reduced as compared with the case of conventional casting, and the support structure can be simplified, so that the cost around the intake silencer can be reduced. .

  Moreover, because the flow guide made of metal plate has ductility, the compressor impeller, called a burst, should be damaged during operation of the turbocharger, and the broken fragments of the compressor impeller scattered in the axial and radial directions. If the flow guide collides with the flow guide, the impact is absorbed or alleviated by plastic deformation of the flow guide. Therefore, safety can be improved.

  The said structure WHEREIN: You may expand the front-end | tip part of the said flow guide. Thereby, the rectification effect of the airflow flowing into the flow guide from the inside of the intake silencer can be enhanced.

  Further, since the compressor according to the present invention is characterized by including any of the intake rectifiers described above, the cover ring can be reduced in size and weight so that a large number of types can be easily arranged. In addition, with a structure that is easy to manufacture, the shape of the flow path from the intake silencer to the intake passage of the compressor can be appropriately selected according to the specifications of the supercharger.

  As described above, according to the intake air rectifier according to the present invention and the compressor including the same, the flow path shape from the intake silencer to the compressor intake passage is supercharged by a small, lightweight, and easily manufactured structure. It can be selected appropriately according to the specifications of the machine.

1 is a longitudinal sectional view showing a vicinity of a compressor and an intake silencer of a turbocharger to which an intake rectifier according to an embodiment of the present invention is applied. It is the longitudinal cross-sectional view which expands the II section of FIG. 1 and shows 1st Embodiment of the intake rectifier which concerns on this invention. It is the III section enlarged view of FIG. 2, (a), (b), (c), (d) is a longitudinal cross-sectional view which shows the example of a shape of a flow guide front-end | tip part, respectively. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the intake rectifier which concerns on this invention. It is the V section enlarged view of FIG. It is a longitudinal cross-sectional view which shows the compressor and intake silencer vicinity of the supercharger which shows the prior art.

  Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment]
FIG. 1 is a longitudinal sectional view showing a compressor 2 of a supercharger 1 to which an intake air rectifier according to the present invention is applied, and the vicinity of an intake silencer 3 connected to the compressor 2.
The supercharger 1 of this embodiment is a device that increases the combustion efficiency of an internal combustion engine by compressing a gas such as air or gas supplied to the internal combustion engine and guiding the compressed gas to the internal combustion engine.

  In the supercharger 1, the compressor 2 is provided adjacent to the bearing base 4, and the turbine shaft 5 pivotally supported by a bearing (not shown) inside the bearing base 4 is passed through the casing 6 of the compressor 2. A compressor impeller 7 is fixed to an end of the turbine shaft 5 so as to rotate integrally. The compressor impeller 7 has a configuration in which a large number of fins (blades) 7 b project from the outer peripheral surface of a hub 7 a that forms the center thereof, and rotates inside the casing 6. An exhaust turbine (not shown) is installed on the opposite side of the bearing stand 4 with respect to the compressor 2, and a turbine impeller (not shown) is fixed to the other end of the turbine shaft 5 so as to rotate integrally.

  Inside the casing 6 of the compressor 2, an intake passage 10 along the axial direction of the turbine shaft 5, a stationary vane-shaped diffuser 11, a spiral scroll passage 12, and a compressed gas outlet 13 are provided. The casing 6 includes, for example, an inner housing 6 a that forms the intake passage 10, a middle housing 6 b that forms the inner peripheral surface of the scroll passage 12, and an outer housing 6 c that forms the outer peripheral surface of the scroll passage 12. 7 is accommodated in the inner housing 6a (intake passage 10). A heat insulating material 15 is attached to the outer peripheral portion of the outer housing 6c. An annular cover ring 20 constituting an intake air rectifier 18 according to an embodiment of the present invention described later is detachably fixed by a plurality of bolts 19 on the inlet side (intake silencer 3 side) of the inner housing 6a. Yes.

  On the other hand, the intake silencer 3 connects, for example, a disk-shaped front panel 21, a rear panel 22 that is opposed to the front panel 21 and has a communication hole 22 a in the center, and the periphery of the panels 21 and 22. The outer peripheral panel 23 provided in this way is a cylindrical shape assembled. Inside the intake silencer 3, a silencer element 25 is provided along the inner peripheral surface of the outer peripheral panel 23, and a guide cylinder 26 is installed along the central axis of the intake silencer 3. The guide tube 26 has a conical shape whose inner diameter decreases from the front panel 21 side toward the rear panel 22 (communication hole 22a) side.

  An outlet pipe 27 extending to the compressor 2 side is inserted into and fixed to the communication hole 22 a of the rear panel 22, and a mounting flange 28 fixed to the outer periphery of the end of the outlet pipe 27 on the compressor 2 side is a casing with a plurality of bolts 29. By being fastened to 6, the intake silencer 3 is connected and fixed to the casing 6. A conical tubular flow guide 30 constituting the intake air rectifier 18 according to the embodiment of the present invention is installed on the inner peripheral portion of the outlet pipe 27. A sound insulating material 32 is disposed between the inner surfaces of the front panel 21 and the rear panel 22, the inside of the guide tube 26, and between the outlet pipe 27 and the flow guide 30, respectively.

  FIG. 2 is a longitudinal sectional view showing the first embodiment of the intake air rectifier 18 by enlarging the II part of FIG. 1. The intake air rectifier 18 is provided between the intake silencer 3 and the intake passage 10 of the compressor 2, and gas A such as air drawn from the outer periphery of the intake silencer 3 is aligned along the central axis of the intake passage 10. The flow is rectified to flow into the intake passage 10.

  As described above, the intake air rectifier 18 is provided on the annular cover ring 20 detachably fixed to the inlet side of the inner housing 6a with a plurality of bolts 19 and the inner peripheral portion of the outlet pipe 27 of the intake silencer 3. And a conical tubular flow guide 30.

  The flow guide 30 that forms the intake outlet portion of the intake silencer 3 has a conical tubular shape whose inner diameter decreases from the intake silencer 3 side toward the intake passage 10 side (cover ring 20 side), and constitutes each part of the intake silencer 3. It is formed of a metal plate similar to a rolled steel plate or the like (for example, Gr. C or Gr. D of ASTM standard A283) and integrated with the intake silencer 3. For example, the end of the flow guide 30 on the intake silencer 3 side is welded to the inner periphery of the front end of the outlet pipe 27, and the end of the flow guide 30 on the intake passage 10 side is connected to the rear of the outlet pipe 27 via the rear end plate 34. It is fixed at the end.

On the other hand, the cover ring 20 is an annular member positioned between the flow guide 30 and the intake passage 10 (inner housing 6 a) of the compressor 2, and a plurality of bolts 19 are attached to the inner housing 6 a forming the intake passage 10. It is concluded with. By this cover ring 20, the inner peripheral surface of the inner housing 6a is substantially extended to the flow guide 30 side. The inner diameter of the cover ring 20 is gradually reduced from the flow guide 30 side toward the intake passage 10 side, and the space between the end inner peripheral surface 30a of the flow guide 30 and the front end inner peripheral surface 10a of the intake passage 10 is covered. The ring 20 is smoothly connected through the inner peripheral surface without any step. The cover ring 20 is preferably cast from cast iron (for example, Gr. 65-45-12 of ASTM standard A536, FCD450 of JIS standard, etc.) constituting the casing 6 of the compressor 2 or the like. It may be manufactured.

  As shown in FIGS. 1 and 2, a minute gap C is provided between the end of the flow guide 30 and the end of the cover ring 20 on the intake silencer 3 side so as not to disturb the flow of the airflow A. ing. The size of the gap C is preferably set in a range of about 3 mm to 5 mm, for example.

  The tip of the flow guide 30 is expanded in a funnel shape (funnel shape or trumpet shape). Examples of the expanded shape (structure) include those shown in FIGS. 3 (a) to 3 (d).

In FIG. 3A, the flow guide 30 is constituted by three metal plates 301, 302, and 303, and the abutting portion is welded by two welding lines W1 and W2 to form an expanded shape.
In FIG. 3B, the flow guide 30 is composed of four metal plates 301, 304, 305, and 306, and the abutting portion is welded by three welding lines W3, W4, and W5 to expand the shape. It is said.
In FIG. 3C, the flow guide 30 is composed of one metal plate 301 and one metal plate 307 having a curved surface, and the butted portion is welded by one welding line W6. Open shape.
FIG. 3D shows that the flow guide 30 is composed of two metal plates 301 and 308, the abutting portions are welded by one welding line W7, and the corner portions of the metal plates 301 and 308 are The shape is expanded by grinding with a grinder or the like from the circumferential side to the position of the line G.

  During operation of the internal combustion engine, exhaust gas from the high-temperature and high-pressure internal combustion engine flows into the exhaust turbine (not shown) of the supercharger 1, and this exhaust gas rotationally drives a turbine impeller (not shown). Thereby, the turbine shaft 5 and the compressor impeller 7 rotate integrally.

  On the compressor 2 side, when the compressor impeller 7 rotates, a negative pressure is generated in the intake passage 10, whereby a gas A such as air or gas is sucked from the outer peripheral portion of the intake silencer 3. This gas A passes through the silencer element 25 inside the intake silencer 3, and then passes through the flow guide 30 provided integrally with the intake silencer 3 and the cover ring 20 located downstream thereof, and flows in the axial direction. And is sucked into the intake passage 10 of the compressor 2.

  The above rectifying action can be appropriately changed according to the specifications of the supercharger 2 by exchanging the cover ring 20 with a different shape. At this time, the flow guide 30 does not need to be changed according to the specifications of the supercharger 2. For example, as shown in FIG. 2, when the shape of the inner housing 6a is changed and the inner diameter of the intake passage 10 is reduced to the shape of 10b indicated by a two-dot chain line, the shape of the cover ring 20 indicated by reference numeral 20a is formed. Replace with one. The inner diameter of the end of the cover ring 20a on the intake silencer 3 side is the same as that of the inner peripheral surface 30a of the flow guide 30, and the inner diameter of the end of the cover ring 20a on the intake passage 10 side is reduced. It is matched with the inner diameter of the inner peripheral surface of the inner housing 6a.

  The gas A passing through the intake passage 10 is compressed by the compressor impeller 7 and then discharged from the compressed gas outlet 13 through the diffuser 11 and the spiral scroll passage 12 and is supplied to an internal combustion engine (not shown).

  In the intake rectifier 18 in the present embodiment, the cover ring 20 is connected to the downstream side of the flow guide 30 integrated with the intake silencer 3 to form a flow path. Therefore, as a member of the intake rectifier that is changed in accordance with the specifications of the supercharger 2, from the intake silencer 101 to the intake passage 103 of the compressor 102, as in the conventional cast flow guide 104 shown in FIG. It is much smaller and lighter than the large and heavy ones that are connected together.

Therefore, workability at the time of opening and assembling of the supercharger 1 (compressor 2) can be improved.
Further, the miniaturized cover ring 20 does not require a large space in its storage location. For this reason, a large number of cover rings 20 can be prepared and appropriately selected according to the specifications of the supercharger 1.
Furthermore, even if the cover ring 20 is manufactured by casting, the wooden mold is reduced in size, so that the wooden mold can be easily stored.

  In this way, the small, lightweight, and easy-to-manufacture structure allows the shape of the flow path from the intake silencer 3 to the intake passage 10 of the compressor 2 to be appropriately selected according to the specifications of the supercharger 1. Performance can be demonstrated.

  In addition, since a minute gap C is provided between the end of the flow guide 30 and the end of the cover ring 20 on the side of the intake silencer 3, the cover ring 20 is made manufacturable. In the case of good casting, it is possible to allow a dimensional error due to casting, particularly an axial position error when the intake silencer 3 is attached.

  The flow guide 30 is conventionally manufactured so as to be thickened to about t12 mm to 20 mm to ensure strength, but in the present invention, it is formed of a metal plate of about t3 mm to 5 mm and integrated with the intake silencer 3. . For this reason, the weight of the flow guide 30 can be drastically reduced as compared with the case of the conventional casting, and the support structure of the flow guide 30 itself can be simplified, so that the cost can be reduced. .

  In the intake air rectifier 18 according to the present embodiment, the flow guide 30 is integrated with the intake silencer 3, so that the flow guide 30 is thinned and weight is reduced as compared with the case where the flow guide 30 is not supported by the intake silencer 3. Can be suppressed. Moreover, it becomes possible to manufacture the flow guide 30 with a metal plate. Furthermore, since the flow guide 30 is supported by metal coupling (welding) to the intake silencer 3, even if the flow guide 30 is thinned, the strength equivalent to that of the conventional structure can be ensured.

  Moreover, since the flow guide 30 made of a metal plate has ductility, the compressor impeller 7 called a burst should be damaged during the operation of the supercharger 1, and the broken pieces of the compressor impeller 7 are axially broken. When the flow guide 30 is scattered in the radial direction and collides with the flow guide 30, the flow guide 30 can be plastically deformed to absorb or mitigate the impact. Therefore, safety can be improved.

  Since the end portion on the intake silencer 3 side of the flow guide 30 is expanded in a funnel shape, the rectification effect of the airflow flowing into the flow guide 30 from the inside of the intake silencer 3 can be further enhanced.

[Second Embodiment]
Next, a second embodiment of the intake air rectifier according to the present invention will be described with reference to FIGS. In the intake rectifier 40 of the second embodiment, the difference from the intake rectifier 18 of the first embodiment shown in FIG. 2 is a step D on the inner periphery of the end of the cover ring 20 on the intake silencer 3 side (see FIG. 5). Is formed, and the end portion 30a of the flow guide 30 is fitted to the step D. Since the configuration other than that is the same as that of the intake air rectifier 18 (see FIG. 2) of the first embodiment, the same reference numerals are given to the respective parts and the description thereof will be omitted.

  By forming such a step D at the end of the cover ring 20 on the intake silencer 3 side and fitting the end of the flow guide, the cross section of the gap C between the flow guide 30 and the cover ring 20 is refracted. The shape becomes. For this reason, it becomes difficult for the gas A to pass through the gap C, and the turbulence of the air flow, that is, the performance deterioration of the compressor 2 can be prevented.

  Further, since the flow guide 30 and the cover ring 20 are fitted together, the intake silencer 3 is positioned by fitting the flow guide 30 into the step D of the cover ring 20 when the intake silencer 3 is attached to the compressor 2. Thus, the intake silencer 3 can be easily attached.

  As described above, according to the intake rectifiers 18 and 40 according to the above-described embodiments and the compressor 2 including the intake rectifiers, the cover rings 20 and 20a that are small, light, and easy to manufacture can be replaced. The flow path shape from the intake silencer 3 to the intake passage 10 of the compressor 2 can be appropriately selected according to the specifications of the compressor 2.

  It should be noted that the present invention is not limited to the configuration of the above-described embodiment, and can be appropriately modified or improved within a scope not departing from the gist of the present invention. Are also included in the scope of rights of the present invention.

DESCRIPTION OF SYMBOLS 1 Supercharger 2 Compressor 3 Intake silencer 5 Turbine shaft 6 Casing 7 Compressor impeller 10 Intake passage 10a Inlet passage tip inner peripheral surfaces 18, 40 Intake rectifier 20 Covering 30 Flow guide 30a Flow guide end inner peripheral surface A Gas C Gap D Step

Claims (7)

An intake rectifier provided in an intake passage between a compressor in a supercharger and an intake silencer connected to an intake gas inlet side of the compressor,
A flow guide that is provided in the intake silencer and has an inner diameter that decreases from the intake silencer side toward the compressor side;
Oite between the flow guide and the compressor, it is detachably fixed to the compressor, and a cover ring for connecting between the flow guide and the intake passage,
The inner diameter of the end portion on the intake silencer side of the cover ring is the same as the inner diameter of the end portion of the flow guide, and the inner diameter of the end portion on the intake passage side of the cover ring is the same as the inner diameter of the inner peripheral surface of the intake passage The intake rectifier is characterized in that the inner peripheral surface of the end of the flow guide and the inner peripheral surface of the tip of the intake passage are connected via the inner peripheral surface of the cover ring.   2. The intake rectifier according to claim 1, wherein the cover ring can be replaced with one having a different inner diameter on the intake passage side in accordance with an internal shape of the intake passage which varies depending on specifications of the supercharger.   The intake rectifier according to claim 1 or 2, wherein a gap is provided between a distal end portion of the flow guide and a front end portion of the cover ring.   The intake rectifier according to claim 3, wherein a step is formed at a front end portion of the cover ring, and an end portion of the flow guide is fitted into the step.   The intake rectifier according to claim 1, wherein the flow guide is formed of a metal plate and is integrated with the intake silencer.   The intake rectifier according to claim 1, wherein an upstream end of the flow guide is expanded.   A compressor comprising the intake air rectifier according to any one of claims 1 to 6.

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