SUPERCHARGER AND MOTOR COOLING METHOD

• US 20170167511A1
• Filed: 02/20/2015
• Published: 06/15/2017
• Est. Priority Date: 02/24/2014
• Status: Active Grant

• Current Assignee: Mitsubishi Heavy Industries Marine Machinery & Equipment Co., Ltd.
• Original Assignee: Mitsubishi Heavy Industries, Ltd.
• Inventors: Tsuji, Takeshi, Shiraishi, Keiichi
• Granted Patent: US 11,396,889 B2
• Time in Patent Office: Days
• CPC Class Codes: F02B 33/40 of non-positive-displacement type
• CPC Class Codes: F02B 37/04 Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump
• CPC Class Codes: F02B 37/10 at least one pump being alternatively or simultaneously driven by exhaust and other drive, e.g. by pressurised fluid from a reservoir or an engine-driven pump
• CPC Class Codes: F02B 39/005 Cooling of pump drives
• CPC Class Codes: F04D 17/10 for compressing or evacuating
• CPC Class Codes: F04D 25/024 the driving means being assisted by a power recovery turbine
• CPC Class Codes: F04D 25/06 the pump being electrically driven F04D25/08 takes precedence
• CPC Class Codes: F04D 25/0606 the electric motor being specially adapted for integration in the pump
• CPC Class Codes: F04D 29/063 specially adapted for elastic fluid pumps
• CPC Class Codes: F04D 29/4206 especially adapted for elastic fluid pumps
• CPC Class Codes: F04D 29/5806 Cooling the drive system
• CPC Class Codes: F04D 29/663 Sound attenuation
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

Provided is an electric-assist supercharger configured such that a motor (30) is attached to the end portion of a rotor shaft (15) close to a silencer (26), the rotor shaft (15) being connected to a compressor portion. Such a supercharger includes a suction air introduction path (24) formed in the silencer 26 such that a main suction air flow flows in the radial direction of the silencer (26) toward a connection portion between the silencer (26) and the compressor portion, and a cooling air intake path (40) formed in the silencer (26) in which at least an outlet thereof is on the center axis of the rotor shaft (15).

Claims

1. A supercharger in which a motor including an opening to introduce cooling air thereto is attached to a silencer-side an end portion of a rotor shaft connected to a compressor portion, the supercharger comprising:

a suction air introduction path formed in a silencer such that a main suction air flow flows in a radial direction of the silencer toward a connection portion between the silencer and the compressor portion; and

a cooling air intake path formed in the silencer in which at least an outlet thereof is on a center axis of the rotor shaft.

2. The supercharger of claim 1, wherein

the suction air introduction path includes an inclined wall configured to guide the main suction air flow toward a center of the motor.

3. The supercharger of claim 1 or 2, further comprising:

a cooling air introduction path which is provided at a silencer-side end the opening portion of the motor and whose diameter is reduced to guide the main suction air flow toward the center of the motor.

4. The supercharger of claim 1, wherein

the motor includes

a cylindrical housing,

a stator housed in the housing, and

a motor rotor including a permanent magnet and connected to an end portion of the rotor shaft to rotate in the stator, and

an inner peripheral surface of the housing is provided with one or more recessed grooves, and thermal grease is applied to the inner peripheral surface and the recessed grooves.

5. The supercharger of claim 4, wherein

a heat dissipation fin is provided on an outer wall surface of the housing.

6. A method for cooling a motor of a supercharger in which the motor is attached to a silencer-side end portion of a rotor shaft including a turbine portion and a compressor portion, the method comprising:

cooling the motor by

a main suction air flow introduced through an air intake port of a silencer and passing through a suction air introduction path, and

a cooling suction air passing through a cooling air intake path formed in the silencer in which at least an outlet thereof is on a center axis of the rotor shaft.