Oil passage for scroll compressor

Details Oil passage for scroll compressor Oil passage for scroll compressor

2001-01-23

2002-07-02

Vrablik, John J. (Department: 3748)

Rotary expansible chamber devices

Working member has planetary or planetating movement

Helical working member, e.g., scroll

Reexamination Certificate

active

06413060

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an oil passage for compressor, especially to an oil passage for a scroll compressor to prevent crumbs or crud from coming into the passage between an orbit scroll member and a main bearing frame of the scroll compressor.
BACKGROUND OF THE INVENTION
FIGS. 1 and 2
show a prior art scroll compressor, which comprises a fixed scroll member
1
a
, an orbit scroll member
2
a
, an isolation block
3
a
and a main bearing frame
4
a
. The fixed scroll member
1
a
and the orbit scroll member
2
a
are engaged to each other to form a plurality of closed spaces
20
a
. The volumes of the plurality of closed spaces
20
a
become smaller from outer portion to center portion of the scroll compressor. The orbit scroll member
2
a
is mounted upon the main bearing frame
4
a
and rotated around the fixed scroll member
1
a
by external force such that low-pressure working fluid is flowed into the closed spaces
20
a
. Afterward, the orbit scroll member
2
a
disturbs the working fluid such that the working fluid is ejected form a discharging port
10
a
at center of the fixed scroll member
1
a
with high pressure, thus finishing the compression stroke for the working fluid.
Moreover, the main bearing frame
4
a
has an inner space
40
a
, the bottom part of the inner space
40
a
is connected to a bushing hole
41
a
. The bushing hole
41
a
houses an eccentric shaft
50
a
and the eccentric shaft
50
a
has an eccentric flange
51
a
on topside thereof. The eccentric flange
51
a
is engaged with the bottom part of the orbit scroll member
2
a
in the inner space
40
a
. As shown in
FIGS. 2 and 3
, the bushing hole
41
a
has an oil inlet
42
a
near the inner space
40
a
and the oil inlet
42
a
is connected to an oil passage
43
a
. The oil passage
43
a
. The outlet of the oil passage
43
a
is connected to an annular rail
44
a
atop the main bearing frame
4
a
. The lubricating oil flows along the surface of the bushing hole
41
a
to the oil inlet
42
a
by the rotation of the eccentric shaft
50
a
. The oil then flows to the annular rail
44
a
atop the main bearing frame
4
a
. The oil within and around the annular rail
44
a
is functioned to provide lubrication between the main bearing frame
4
a
and the orbit scroll member
2
a.
However, the oil is flowed to the junction between the main bearing frame
4
a
and the orbit scroll member
2
a
after a long distance. The oil may contain some crumbs or crud and the crumbs or crud are brought to the junction between the main bearing frame
4
a
and the orbit scroll member
2
a
by the oil. The crumbs or crud within the oil cause the abrasion of the junction between the main bearing frame
4
a
and the orbit scroll member
2
a
and degrades the relative rotation between the main bearing frame
4
a
and the orbit scroll member
2
a
. Therefore, the problem of crumbs or crud within the oil becomes important issues for the scroll compressor.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide an oil passage for a scroll compressor to prevent crumbs or crud from coming into the passage between an orbit scroll member and a main bearing frame of the scroll compressor. The oil passage can also prevent excessive oil from flowing into the compression chamber to enhance compression efficiency.
To achieve the above object, the present invention provides an oil passage for scroll compressor, wherein a plurality of slanting gutters are provided on top surface of the main bearing frame. The scroll compressor comprises an orbit scroll member, a fixed scroll member, and a main bearing frame. The orbit scroll member is engaged with the fixed scroll member; and the orbit scroll member is on the main bearing frame and orbits the fixed scroll member. The main bearing frame has a groove and an annular ring formed on topside thereof. The groove is communicated with the slanting gutters and the slanting gutters are slantingly intersected with the annular ring. A trench is formed between the gutter and the groove to facilitate the oil to flow into the gutter. The oil flows from the groove into the gutter, and then flows to the annular ring or topside of the main bearing frame to provide lubrication. The crumbs or crud are also flow out of the topside of the main bearing frame through the gutter.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing, in which:


REFERENCES:
patent: 4065279 (1977-12-01), McCullough
patent: 4734020 (1988-03-01), Inaba et al.
patent: 4772188 (1988-09-01), Kimura et al.

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