US 9,316,223 B2Granted

Scroll expander with adiabatic layer

AssigneeAnest Iwata Corporation

InventorsAtsushi Unami, Tamotsu Fujioka

Life of this patent

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Abstract

Provided is a double rotation type scroll expander, aiming at protecting a bearing that supports drive shaft a drive shaft and the like from the heat of a working medium when a working medium introduction hole is provided in the drive shaft. The working medium introduction hole is drilled into the drive shaft such that the high-temperature, high-pressure working medium is supplied to expansion chambers through the working medium introduction hole. An adiabatic sleeve that forms a part of the working medium introduction hole is attached to the drive shaft in an internal region of roller bearings that support the drive shaft and a driven scroll body rotatably. Heat transfer from the working medium to the roller bearings is suppressed by the adiabatic sleeve, whereby the roller bearings are prevented from deteriorating.

Claims13

Dependent claims

A scroll expander comprising:

a drive shaft;
a drive scroll body provided integrally with the drive shaft;
a driven scroll body having a rotary axis that is eccentric relative to a rotary axis of the drive shaft;
an interlocking mechanism that causes the drive scroll body and the driven scroll body to rotate synchronously;
and
a bearing that supports the drive shaft and the driven scroll body rotatably relative to a housing, wherein
an expansion chamber is formed by the drive scroll body and the driven scroll body,
a working medium introduction hole that extends in an axial direction along the center of the drive shaft and opens in a radial direction perpendicular to the axial direction, into a central portion of the expansion chamber is provided in the drive shaft, and
an adiabatic layer is provided in a region between the bearing and the working medium introduction hole so as to surround the working medium introduction hole.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/867,342Filed 22 Apr 2013
Priority: JP 2012-10001725 Apr 2012
Published: US 2013/0315767 A128 Nov 2013
Granted: 19 Apr 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

F04C 18/00
Rotary-piston pumps specially adapted for elastic fluids
F01C 1/0238
Where both members are moving: with symmetrical double wraps
F01C 21/06
Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00: heating; Cooling ; Heat insulation
F04C 2240/603
Shafts: with internal channels for fluid distribution, e.g. hollow shaft