Scroll type fluid handling machine

Details Scroll type fluid handling machine Scroll type fluid handling machine

1990-10-26

1992-02-25

Bertsch, Richard A.

Pumps

Motor driven

Electric or magnetic motor

417366, 418 553, 418188, F04B 1700, F04C 200, F04C 1500

Patent

active

050908766

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a full system rotatable scroll type fluid handling machine comprising a sealed casing containing therein an electromotor, a driver scroll member adapted to be rotatably driven by said electromotor and a follower scroll member adapted to be eccentrically rotated with respect to said driver scroll member so that both the driver scroll member and the follower scroll member are rotated as said electromotor is energized but said follower scroll member presents an eccentric movement while it is rotated.


PRIOR ART

The full system rotatable scroll type fluid handling machine is well known, in which both the driver scroll member and the follower scroll member are rotated to achieve compression of refrigerant.
With such scroll type fluid handling machine of prior art, there has usually been provided the arrangement that the rotational center of the follower scroll member is made eccentric with respect to the rotational center of the driver scroll member and these two scroll members are engaged with each other. As said driver scroll member is rotatably driven by the drive source, said follower scroll member presents an eccentric movement while it is rotated and thus compression of refrigerant is successively carried out in the compression chambers defined by these two scroll members.
For rotatably driving the driver scroll member, Japanese Patent Application Disclosure Gazette No. 1975-32512 discloses the arrangement that a pulley is mounted on a drive shaft of the scroll member and the latter is rotatably driven by an electromotor via a belt operatively connecting said pulley with the electromotor, and Japanese Patent Application Disclosure Gazette No. 1987-210279 discloses the arrangement that a rotor is mounted on the drive shaft of the driver scroll member at a location remote from the driver scroll member itself with respect to a bearing bracket serving to support said drive shaft and a stator is disposed around said rotor so as to constitute an electromotor for rotatably driving the driver scroll member.
However, the arrangement utilizing a pulley/belt combination necessarily increases an axial dimension of the shaft because the drive shaft and the follower shaft are supported by separate bearings and the drive shaft carries the pulley for power transmission. The arrangement having the rotor mounted on the drive shaft also necessarily results in an increased axial dimension of the shaft because of the bearing bracket for the drive shaft mounted thereon between the driver scroll member and the electromotor. In this manner, both of the above-mentioned well known arrangements have prevented the scroll type fluid handling machine from being made compact due to their inherent features inevitably resulting in increased axial dimension of the respective scroll type fluid handling machines.
Accordingly, it is a primary object of the invention to provide a scroll type fluid handling machine so improved as to enable its axial length to be effectively reduced and thereby provide a compact machine.


SUMMARY OF THE INVENTION

The object set forth above is achieved, in accordance with the present invention, by a full system rotatable scroll type fluid handling machine comprising a sealed casing containing therein a cylindrical boss, a coupling carried around said boss to rotate a driver scroll member, an electromotor mounted on this location (i.e., around the boss), and a shaft (i.e., follower shaft) of a follower scroll member supported on the inner periphery of said boss. In this way, not only the scroll members which have conventionally been supported on separate locations can be supported on substantially the same location (i.e., inner and outer peripheries of the cylindrical boss) but also the electromotor can be mounted on the same location. As a result, it becomes possible to reduce the axial length of the machine and thereby to make the machine compact, even when the machine is of the full system rotatable type.


BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1 and 2 i

REFERENCES:
patent: 4178143 (1979-12-01), Thelan et al.
patent: 4795323 (1989-01-01), Lessie
patent: 4854831 (1989-08-01), Etemard et al.

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