Simplified stamped counterweight

Details Simplified stamped counterweight Simplified stamped counterweight

2002-05-21

2004-01-27

Freay, Charles G. (Department: 3746)

Pumps

Motor driven

Electric or magnetic motor

C418S151000, C310S051000

Reexamination Certificate

active

06682323

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to a simple counterweight construction for a sealed compressor.
Sealed compressors are utilized in most refrigerant compression applications. One well known type of sealed compressor is a scroll compressor. In a scroll compressor, first and second scroll elements are each formed with a base and a generally spiral wrap extending from the base. The wraps interfit to define compression chambers. One of the two scroll members is caused to orbit relative to the other.
Scroll compressors are formed to have a counterweight associated with their drive shaft. The counterweight is positioned to account for weight imbalance during operation of the scroll compressor.
Historically, counterweights were relatively large items. As an example,
FIG. 1
shows a prior art sealed compressor
20
. The compressor incorporates a non-orbiting scroll member
22
and orbiting scroll
24
. The scroll members each include wraps
25
, which interfit to define compression chambers. An electric motor
30
includes a stator
32
and a rotor
34
. As known, the stator has windings
36
at each axial end. The rotor
34
has an end ring
38
at each end. As can be appreciated in
FIG. 1
, the upper end ring stops at a vertical position beneath the vertically uppermost portion of the windings
36
. A relatively massive counterweight
40
is shown in FIG.
1
. The counterweight
40
requires a good deal of space.
More recently, the assignee of the present application has developed a thin, stamped counterweight. This counterweight is shown for example in U.S. Pat. No. 6,247,907. While the counterweight of this patent is successful, and requires less axial space than the prior art of
FIG. 1
, it would still be desirable to further simplify the counterweight.
SUMMARY OF THE INVENTION
The instant application includes a thin counterweight which is formed from a relatively flat sheet. The relatively flat sheet is a very simple part to manufacture, and will require little axial space when assembled. In another aspect of this invention, the counterweight is attached to the upper end ring of the rotor. Preferably, the end ring extending vertically upwardly beyond the vertically uppermost part of the stator windings.
The present invention thus provides a unique counterweight which is simpler to manufacture than the prior art, and which requires little axial space.


REFERENCES:
patent: 4271368 (1981-06-01), Burns
patent: 4388756 (1983-06-01), Burns
patent: 4915554 (1990-04-01), Serizawa et al.
patent: 5312229 (1994-05-01), Sano et al.
patent: 5314316 (1994-05-01), Shibamoto et al.
patent: 5336060 (1994-08-01), Tomell et al.
patent: 5395224 (1995-03-01), Caillat et al.
patent: 5597293 (1997-01-01), Bushnell et al.
patent: 5951271 (1999-09-01), DuMoulin et al.
patent: 6247907 (2001-06-01), Williams et al.
patent: 6291920 (2001-09-01), Miller et al.

Affiliated with

Also associated with

Rating

Simplified stamped counterweight does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Simplified stamped counterweight, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Simplified stamped counterweight will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3200620