Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
2001-03-06
2004-02-24
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C418S055400, C418S142000
Reexamination Certificate
active
06695597
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a scroll fluid machine which performs compression, expansion, and pressure feeding, specifically a scroll fluid machine of which the outermost wrap of either of the stationary or revolving scroll which is larger in diameter is formed into an annular shape to form the outermost wall of an enclosing body for taking in fluid to be compressed.
2. Description of the Related Art
A scroll fluid machine having a stationary scroll and a revolving scroll is well known. Art disclosed in Published Unexamined Patent Application No. Hei-7-208353 is one. According to this art, as shown in
FIG. 12
, a stationary scroll
106
has a space
108
and a wrap
100
, an annular groove
122
is formed on the mating face
121
of the stationary scroll
106
, an elastic element
127
and a seal element
123
are arranged in the annular groove
122
, and a revolving scroll
107
revolves while its mirror surface slides on the seal element
123
.
The portion
121
B of the mating face
121
is essentially not needed for taking in and compressing fluid. The mirror surface of the revolving scroll
107
is required to be extended over the portion
121
B of the mating face
121
, which leads to a larger diameter of the revolving scroll. The width of the mating face
121
of the stationary scroll is enough as long as the annular groove
122
can be formed with narrow rims on both sides of the annular groove
122
remaining.
According to the prior art, therefore, there remains an essentially not necessary, not slimmed portion, which hinders downsizing of the scroll fluid machine.
On the other hand, in order to achieve a high compression ratio, or a high pressure ratio in the case of a scroll compressor, the number of turns of scroll wraps is to be increased, and to shorten the time for evacuating a vessel in the case of a scroll vacuum pump, the suction volume of fluid is to be increased. To achieve high compression ratio or to shorten the time for evacuation, the revolving radius of the revolving scroll is required to be increased, leading to enlarged outer dimensions of the scroll fluid machine.
However, the space
108
is to be expanded in order to meet the requirements for using the prior art, which leads to an increased revolving radius of the revolving scroll and increased friction of the seal element
123
, for the seal element
123
is to be lengthened owing to increased diameter of the annular groove. Further, for achieving a high compression ratio, the arrangement of a seal element between each of the top faces of the wraps and each of the mating sliding surfaces is necessary to prevent the leakage of compressed fluid from a compression chamber higher in pressure to that lower in pressure in the process of compression, the chambers being formed by the wraps of the revolving scroll and stationary scroll. The lengths of these seal elements are increased as the dimensions of the scroll fluid machine increase, and the friction by the seal elements also increases.
SUMMARY OF THE INVENTION
The present invention is done in the light of problems cited above. An object of the invention is to provide a scroll fluid machine capable of being small sized.
Another object of the invention is to provide a scroll fluid machine capable of achieving high compression ratio or high pressure ratio without enlarging the outer dimensions of the scroll machine.
A still further object of the invention is to provide a scroll fluid machine capable of preventing the increase of load by friction when the achievement of a high compression ratio is intended.
A yet further object of the invention is to provide a scroll fluid machine capable of saving the usage of the materials of scrolls, seal elements, etc.
The present invention is a scroll fluid machine having a stationary scroll and a revolving scroll, each scroll having a spiral scroll wrap spiraling from the center side to the outer side, one of the scrolls having an annular, outermost wrap of which the radius is larger than that at the outer end of the spiral wrap of the other scroll. The annular, outermost wrap is the outermost wall, and the scrolls are assembled so that the wrap of the other scroll is disposed in the inner side of the of the said one of the scrolls.
According to the invention, either one of the stationary or revolving scroll, each scroll having a spiral scroll wrap spiraling from the center side to the outer side, is provided with an annular, outermost wrap. The radius of the outermost wrap is larger than that at the outer end of the spiral wrap of the other scroll, and the outermost wrap forms the outermost wall of the said one of the scrolls, so the outermost wall has no excess width of rims as is the case with the prior art. The one and the other scrolls are assembled so that the wrap of the said other scroll is disposed in the inner side of the wrap of the said one of the scrolls. Therefore, the scroll mechanism becomes small sized, and the downsizing of the scroll fluid machine is achieved.
Accordingly, the light weight of the constituent elements of the scroll fluid machine is achieved, the load for driving the scroll mechanism is lightened, and the power for driving the scroll fluid mechanism is reduced.
Thus, a higher compression ratio or a higher pressure ratio is achieved with the same dimensions of the scroll fluid machine as in the prior art.
Also, the present invention is a scroll fluid machine having a stationary scroll and a revolving scroll, each scroll having a spiral scroll lap spiraling from the center side to the outer side, one of the scrolls having an annular, outermost wrap with the diameter larger than the outer end of the spiral wrap of the other scroll. The annular outermost wrap is the outermost wall, and the scrolls are assembled so that the wrap of the other scroll is disposed in the inner side the one of the scrolls. A seal element for sliding surface sealing which contacts with the mating sliding surface is provided on the outermost wrap.
According to the invention cited above, each of the seal elements provided on the wraps of the stationary and revolving scrolls slides on each mating sliding surface to keep the chambers formed toward both sides of the wrap sealed, so the leakage of the compressed fluid from a compression chamber higher in pressure to that lower in pressure is prevented, and high compression ratio, or high pressure ratio, can be achieved.
According to this second invention, as in the first invention, either one of the stationary or revolving scroll, each scroll having a spiral scroll wrap spiraling from the center side to the outer side, is provided with an annular, outermost wrap. The radius of the outermost wrap is larger than that at the outer end of the spiral wrap of the other scroll, and the outermost wrap forms the outermost wall of the said one of the scrolls, so the outermost wall has no excess width of rims as is the case with the prior art. The one and the other scrolls are assembled so that the wrap of the said other scroll is disposed in the inner side of the wrap of the said one of the scrolls. Therefore, the scroll mechanism becomes small sized, and the downsizing of the scroll fluid machine is achieved.
Further, as a seal element for sliding surface sealing which contacts with the mating sliding surface is provided on the outermost wrap, the seal element for sliding surface sealing on the outermost wrap achieves the role of sealing dust while at the same time achieving the sealing of fluid without providing an extra dust seal still outside of the outermost wrap.
Accordingly, the light weight of the constituent elements of the scroll fluid machine is achieved, the load for driving the scroll mechanism is lightened, and the power for driving the scroll fluid mechanism is reduced.
Thus, a higher compression ratio or a higher pressure ratio is achieved with the same dimensions of the scroll fluid machine of the prior art.
As the outermost wrap achieves the role of the outermost wall, it is required to use a dust
Fukui Atushi
Honma Toshihiro
Kimura Hideyuki
Yanagisawa Ken
Anest Iwata Corporation
Crowell & Moring LLP
Denion Thomas
Trieu Theresa
LandOfFree
Scroll fluid machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Scroll fluid machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scroll fluid machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3283506