JP2011052558A - Supercharger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the production costs of a supercharger equipped with a seal for minimizing without limit a clearance between the housing and the impeller. <P>SOLUTION: A turbocharger 1 comprises a compressor 2 and a turbine 3. The compressor 2 comprises a housing body 210, a shroud 211 formed separately from the housing body 210, a compressor impeller 22 which is rotatably arranged in the housing body 210 to take in new air into the housing body 210 and compress it, and a seal portion 212 which is supported between the housing body 210 and the shroud 211, thereby fixed between the housing body 210 and the compressor impeller 22, and contacts the leading edge of the rotating compressor impeller 22. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a supercharger.

  For the purpose of improving the output of the internal combustion engine, a supercharger that supplies more fresh air is used. Such a supercharger includes a housing and an impeller that is rotatably mounted in the housing. When the clearance between the housing and the impeller blades increases, the compression efficiency of fresh air decreases. In order to improve the compression efficiency of such fresh air, a technique is known in which a so-called abradable seal is formed on the shroud portion of the housing facing the tip of the impeller blade to reduce the above clearance to the limit. Yes. An example of a turbocharger having such a technique is disclosed in Patent Document 1.

  The turbocharger disclosed in Patent Document 1 is provided with a groove on the inner wall of the compressor housing that faces the outer edge of the compressor impeller, and a sliding member (ablationable seal) that protrudes just before contacting the compressor impeller is mounted in this groove. By doing so, the clearance between the compressor housing and the compressor impeller is made extremely small.

Japanese Patent Laid-Open No. 11-173153

  However, in the turbocharger disclosed in Patent Document 1, a sliding member (abradable seal) provided between the compressor impeller and the compressor housing is fixed to the compressor housing by using a C ring. Therefore, the turbocharger disclosed in Patent Document 1 requires a process for fixing the sliding member (ablationable seal) by the C-ring at the time of manufacture, and costs such as the C-ring parts cost and assembly cost are required. Yes.

  Therefore, an object of the present invention is to reduce the manufacturing cost of a supercharger provided with a seal that makes the clearance between the housing and the impeller as small as possible.

  A turbocharger of the present invention that solves such a problem is provided with a housing main body, a shroud portion formed separately from the housing main body, and a rotatable arrangement inside the housing main body, and takes in fresh air into the housing main body. An impeller that compresses, and a seal portion that is fixed between the housing main body and the impeller by being sandwiched between the housing main body and the shroud portion, and that contacts the tip of the rotating impeller. Yes.

  In the supercharger of the present invention, since the seal part can be fixed without using a member for fixing the seal part, the cost of the member for fixing the seal part can be reduced. Moreover, the assembly cost of the member for fixing a seal part can be reduced.

It is explanatory drawing which showed the turbocharger. It is explanatory drawing which expanded and showed a part of compressor. It is explanatory drawing which expanded and showed the periphery of the seal | sticker part in another Example.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing a schematic configuration of a turbocharger 1 which is an example of a supercharger of the present invention.

  The turbocharger 1 is a device that sends pressurized air to an internal combustion engine to improve the output of the internal combustion engine. The turbocharger 1 includes a compressor 2 and a turbine 3. The compressor 2 includes a compressor housing 21 and a compressor impeller 22. The compressor impeller 22 is disposed in a compressor chamber 23 formed in the compressor housing 21. The turbine 3 includes a turbine housing 31 and a turbine wheel 32. The turbine wheel 32 is disposed in a turbine chamber 33 formed in the turbine housing 31. The turbocharger 1 includes a rotor shaft 4. A compressor impeller 22 is fixed to one end of the rotor shaft 4, and a turbine wheel 32 is fixed to the other end. The rotor shaft 4 is rotatably supported by a bearing 5.

  The compressor housing 21 is provided with an intake inlet 24, an intake passage 25, and an intake outlet 26. The intake inlet 24 is formed so as to extend in the axial direction of the compressor chamber 23 and is connected to an end of an intake pipe (not shown). The intake passage 25 is formed in a substantially annular shape along the outer periphery of the compressor chamber 23, and an intake outlet 26 serving as a supply outlet thereof is connected to an intake pipe (not shown) on the internal combustion engine side.

  The turbine housing 31 is provided with an exhaust inlet 34, an exhaust passage 35, and an exhaust outlet 36. The exhaust passage 35 is formed in a substantially annular shape along the outer periphery of the turbine chamber 33, and an exhaust pipe (not shown) of an internal combustion engine is connected to the exhaust inlet 34 on the introduction side. The exhaust outlet 36 is formed to extend in the axial direction of the turbine chamber 33 and is connected to an exhaust pipe (not shown).

  The exhaust gas introduced into the exhaust passage 35 via the exhaust inlet 34 after the internal combustion engine is operated is introduced into the turbine chamber 33 while moving around the turbine chamber 33 along the exhaust passage 35. The exhaust gas introduced into the turbine chamber 33 rotates the turbine wheel 32 and is then discharged from the exhaust outlet 36 to the exhaust pipe. As the turbine wheel 32 rotates, the compressor impeller 22 connected by the rotor shaft 4 rotates. By rotating the compressor impeller 22, fresh air in the compressor chamber 23 is pumped to the intake outlet 26 through the intake passage 25, and new outside air is introduced into the compressor chamber 23 through the intake inlet 24. Thus, the turbocharger 1 supplies the compressed fresh air to the internal combustion engine.

  Next, the compressor 2 will be described in more detail. FIG. 2 is an explanatory view showing a part of the compressor 2 in an enlarged manner.

  The compressor housing 21 includes a housing main body 210 and a shroud portion 211 formed separately from the housing main body 210. Further, the seal portion 212 is disposed between the housing main body 210 and the compressor impeller 22 by being sandwiched and fixed between the housing main body 210 and the shroud portion 211. This seal portion 212 is formed by injection molding or spraying a material that is easily cut, such as a so-called abradable material in which aluminum, polyester resin, or the like is mixed into a workpiece formed in a shape that follows the shape of the blades of the compressor impeller 22. is there. The seal portion 212 is fixed so that the tip portion 221 of the blade of the compressor impeller 22 contacts the ablative coating at the contact surface A when the compressor impeller 22 rotates. By fixing the seal portion 212 in this way, the clearance between the compressor impeller 22 and the seal portion 212 becomes extremely small, and the sealing performance is improved.

  The seal portion 212 is assembled by press-fitting the shroud portion 211 into the housing body 210. Specifically, the surface of C in FIG. 2, that is, the radially outer surface of the recess 210 a formed in the housing body 210 and the radially outer surface of the convex portion 211 a formed in the shroud 211 are press-fitted. Crimped and fixed. Further, by pressing the shroud portion 211 into the housing main body 210 in this manner, the seal portion 212 is sandwiched, and positioning in the axial direction (B in FIG. 2) and the normal direction (C in FIG. 2) is performed. In this way, since no other parts are used for fixing the seal portion 212, the parts cost is reduced. Moreover, since it can fix by one press injection, a work burden and assembly | attachment cost can be reduced. The portion C in FIG. 2 is a press-fit surface, and the outer diameter of the shroud portion 211 corresponding to the C surface before assembly is larger than the inner diameter of the housing body 210 corresponding to the C surface before assembly. .

  Further, the convex portion 211 a formed on the shroud portion 211 is combined with the concave portion 210 a formed on the housing body 210. Further, only a part of the concave portion 212b formed in the shroud portion 211 is combined with a convex portion 211b formed in the shroud portion 211 in combination with the concave portion 212b formed in the seal portion 212 having a different width. Thus, the seal portion 212 is held by the engagement of the convex portions 211b and the concave portions 212b having different widths only in part, and the seal portion 212 is prevented from coming out. Further, due to the engagement of the convex portion 211b and the concave portion 212b, the seal portion 212 is rotated relative to the housing main body 210 and the shroud portion 211 when the seal portion 212 is finished and when the turbocharger 1 is rotated. To prevent. Here, the concave portion 212b formed in the seal portion 212 and the convex portion 211b formed in the shroud portion 211 constitute rotation prevention means of the present invention. In addition, it is good also as preventing rotation of a seal part by the structure which formed the recessed part or the convex part in the housing main body 210, and formed the convex part or the recessed part in the seal part 212 so that it may be combined.

  Subsequently, another configuration of the embodiment will be described. FIG. 3A and FIG. 3B are explanatory views showing the periphery of the seal portion 212 in another configuration in an enlarged manner. 3A differs from the configuration of FIG. 2 in that the seal portion 212 is disposed between the housing main body 210 and the seal portion 212 and between the shroud portion 211 and the seal portion 212 with a gap provided therebetween. Yes. With such a configuration, the internal stress due to the thermal expansion of the seal portion 212 during the operation of the turbocharger 1 is reduced. Further, in the configuration of FIG. 3A, a gap may be provided only in either the housing body 210 and the seal portion 212 or between the shroud portion 211 and the seal portion 212.

  FIG. 3B is different from the configuration of FIG. 2 in that an elastic absorbent is inserted between the housing main body 210 and the seal portion 212 and between the shroud portion 211 and the seal portion 212. As the elastic absorbent, a highly heat-resistant elastic material such as fluoro rubber can be adopted. With such a configuration, it is possible to prevent the generation of noise and friction due to the play of the seal portion 212. In the configuration of FIG. 3B, the elastic absorbent may be inserted only between the housing main body 210 and the seal portion 212 or between the shroud portion 211 and the seal portion 212.

  The above-described embodiments are merely examples for carrying out the present invention, and the present invention is not limited thereto. Various modifications of these embodiments are within the scope of the present invention. It is apparent from the above description that various other embodiments are possible within the scope.

DESCRIPTION OF SYMBOLS 1 Turbocharger 2 Compressor 3 Turbine 22 Compressor impeller 210 Housing main body 211 Shroud part 212 Seal part 210a, 212b Concave part 211a, 211b Convex part 271,272 Clearance 281,282 Elastic absorber

Claims (5)

A housing body;
A shroud portion formed separately from the housing body;
An impeller that is rotatably arranged inside the housing body, takes fresh air into the housing body, and compresses it;
A seal portion that is fixed between the housing main body and the impeller by being sandwiched between the housing main body and the shroud portion, and a tip of the rotating impeller comes into contact therewith,
A turbocharger characterized by comprising:   The supercharger according to claim 1, wherein the seal portion is assembled by press-fitting the housing body and the shroud portion.   The supercharger according to claim 1 or 2, further comprising an anti-rotation means between the seal portion and the housing body, or between the seal portion and the shroud portion.   4. The process according to claim 1, wherein the seal portion is disposed with a gap between the housing body and the seal portion and / or between the shroud portion and the seal portion. 5. Feeder.   The supercharger according to any one of claims 1 to 3, wherein an elastic absorbent is inserted between the housing body and the seal portion and / or between the shroud portion and the seal portion.

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