Turbocharger

Abstract

The present invention provides a turbocharger including a compressor housing provided therein with an air flow path in which an impeller is disposed and a bearing housing. The air flow path includes a suction port and a discharge scroll chamber. The compressor housing includes a shroud surface and a diffuser surface. The bearing housing includes a facing surface which is facing to the diffuser surface. A cleaning agent supplying units are provided in the diffuser surface and the facing surface. The cleaning agent supplying units include porous supplying portions for forming at least a portion of the diffuser surface or the facing surface, and a cleaning agent for preventing adhesion of deposits is supplied from the porous supplying portions to the diffuser surface or the facing surface.

1 . A turbocharger comprising:
 a compressor housing provided therein with an air flow path in which an impeller is disposed; and   a bearing housing for rotatably supporting a rotor shaft to which the impeller is connected, wherein:   the air flow path includes a suction port through which air is sucked toward the impeller, and a discharge scroll chamber which is formed on an outer peripheral side of the impeller in its circumferential direction, and which guides, to outside, compressed air discharged from the impeller;   the compressor housing includes a shroud surface facing to the impeller, and a diffuser surface extending from the shroud surface toward the discharge scroll chamber;   the bearing housing includes a facing surface which is facing to the diffuser surface of the compressor housing and which forms a diffuser passage between the facing surface and the diffuser surface;   a cleaning agent supplying unit is provided in at least one of the diffuser surface of the compressor housing and the facing surface of the bearing housing; and   the cleaning agent supplying unit includes a porous supplying portion made of porous material for forming at least a portion of the diffuser surface or the facing surface, and is configured such that cleaning agent for preventing adhesion of deposits is supplied from the porous supplying portion to the diffuser surface or the facing surface.   
     
     
         2 . The turbocharger according to  claim 1 , wherein the bearing housing includes a bearing body and a back plate which is disposed between the bearing body and the compressor housing and which faces to a portion of the air flow path, the bearing body and the back plate are separated from each other, and the back plate is provided with the facing surface. 
     
     
         3 . The turbocharger according to  claim 1 , wherein the cleaning agent supplying unit is configured such that the cleaning agent passes through the porous supplying portion and is supplied to the diffuser surface or the facing surface. 
     
     
         4 . The turbocharger according to  claim 2 , wherein the cleaning agent supplying unit is configured such that the cleaning agent passes through the porous supplying portion and is supplied to the diffuser surface or the facing surface. 
     
     
         5 . The turbocharger according to  claim 3 , wherein the porous supplying portion is configured such that the cleaning agent in a liquid state does not pass through the porous supplying portion and the cleaning agent in a gas state passes through the porous supplying portion, and the cleaning agent supplying unit is configured such that the cleaning agent in the liquid state is vaporized under a predetermined condition, the cleaning agent passes through the porous supplying portion and is supplied to the diffuser surface or the facing surface. 
     
     
         6 . The turbocharger according to  claim 4 , wherein the porous supplying portion is configured such that the cleaning agent in a liquid state does not pass through the porous supplying portion and the cleaning agent in a gas state passes through the porous supplying portion, and the cleaning agent supplying unit is configured such that the cleaning agent in the liquid state is vaporized under a predetermined condition, the cleaning agent passes through the porous supplying portion and is supplied to the diffuser surface or the facing surface. 
     
     
         7 . The turbocharger according to  claim 1 , wherein the cleaning agent supplying unit is configured such that the porous supplying portion is impregnated with the cleaning agent in a liquid state, the cleaning agent is vaporized under a predetermined condition and is supplied to the diffuser surface or the facing surface. 
     
     
         8 . The turbocharger according to  claim 2 , wherein the cleaning agent supplying unit is configured such that the porous supplying portion is impregnated with the cleaning agent in a liquid state, the cleaning agent is vaporized under a predetermined condition and is supplied to the diffuser surface or the facing surface. 
     
     
         9 . The turbocharger according to  claim 1 , wherein the cleaning agent supplying unit further includes a reservoir in which the cleaning agent is stored, and the cleaning agent supplying unit supplies the cleaning agent stored in the reservoir to the porous supplying portion. 
     
     
         10 . The turbocharger according to  claim 2 , wherein the cleaning agent supplying unit further includes a reservoir in which the cleaning agent is stored, and the cleaning agent supplying unit supplies the cleaning agent stored in the reservoir to the porous supplying portion. 
     
     
         11 . The turbocharger according to  claim 3 , wherein the cleaning agent supplying unit further includes a reservoir in which the cleaning agent is stored, and the cleaning agent supplying unit supplies the cleaning agent stored in the reservoir to the porous supplying portion. 
     
     
         12 . The turbocharger according to  claim 4 , wherein the cleaning agent supplying unit further includes a reservoir in which the cleaning agent is stored, and the cleaning agent supplying unit supplies the cleaning agent stored in the reservoir to the porous supplying portion. 
     
     
         13 . The turbocharger according to  claim 5 , wherein the cleaning agent supplying unit further includes a reservoir in which the cleaning agent is stored, and the cleaning agent supplying unit supplies the cleaning agent stored in the reservoir to the porous supplying portion. 
     
     
         14 . The turbocharger according to  claim 6 , wherein the cleaning agent supplying unit further includes a reservoir in which the cleaning agent is stored, and the cleaning agent supplying unit supplies the cleaning agent stored in the reservoir to the porous supplying portion. 
     
     
         15 . The turbocharger according to  claim 7 , wherein the cleaning agent supplying unit further includes a reservoir in which the cleaning agent is stored, and the cleaning agent supplying unit supplies the cleaning agent stored in the reservoir to the porous supplying portion. 
     
     
         16 . The turbocharger according to  claim 8 , wherein the cleaning agent supplying unit further includes a reservoir in which the cleaning agent is stored, and the cleaning agent supplying unit supplies the cleaning agent stored in the reservoir to the porous supplying portion.