Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
2002-01-28
2003-11-18
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C418S057000
Reexamination Certificate
active
06648618
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a scroll compressor, which is a refrigerant compressor used in refrigeration air conditioning equipment.
BACKGROUND OF THE INVENTION
Conventionally, a scroll compressor such as that disclosed in Japanese Patent Application Laid-Open No. 2000-161254, for example, is known as a refrigerant compressor used in refrigeration air conditioning equipment. As is shown in the vertical cross sectional view in
FIG. 5
, this scroll compressor is formed by providing a compressing mechanism that compresses refrigerant gas and an electric motor section that drives the compressing mechanism inside a sealed container
10
.
Here, a fixed scroll
1
and an orbiting scroll
2
form the center of the compressing mechanism. An outer peripheral portion of the fixed scroll
1
is fastened by a bolt or the like (not shown) to a guide frame
15
that is fastened to a sealed container
10
. The fixed scroll
1
is provided with a base plate
1
a,
which is shaped as a circular plate, and plate shaped spiral teeth
1
b
that are formed on the surface on one side (the lower side surface in
FIG. 5
) of the base plate
1
a.
A pair of Oldham guide grooves
1
c
is formed substantially in a straight line at an outer peripheral portion of the fixed scroll
1
. A pair of fixed claws
9
c
of an Oldham ring
9
engage with the Oldham guide grooves
1
c
so as to be able to slide freely in reciprocal directions.
The orbiting scroll
2
is also formed from a base plate shaped as a circular plate and plate shaped spiral teeth
2
b
that are formed on the surface on one side (the upper side surface in
FIG. 5
) of the base plate
2
a.
The configuration of the plate shaped spiral teeth
2
b
is formed in substantially the same spiral configuration as the plate shaped spiral teeth
1
b
of the fixed scroll
1
. A boss
2
f,
which is shaped as a hollow cylinder, is formed at a center portion of the surface on the opposite side to the surface on which the plate shaped spiral teeth
2
b
are formed (i.e., on the lower side surface in
FIG. 5
) of the base plate
2
a.
A bearing
2
c
of the orbiting scroll
2
is formed in an inner peripheral surface of the boss
2
f.
A thrust surface
2
d,
which is capable of sliding so as to press contact a thrust bearing
3
a
of a compliant frame
3
, is also formed in an outer peripheral portion of this surface (i.e., the lower side surface in
FIG. 5
A pair of Oldham guide grooves
2
e,
which have a phase difference of substantially 90 degrees relative to the Oldham guide grooves
1
c
of the fixed scroll
1
, are formed substantially in a straight line at an outer peripheral portion of the base plate
2
a
of the orbiting scroll
2
. A pair of oscillating claws
9
a
of the Oldham ring
9
engage with the Oldham guide grooves
2
e
so as to be able to slide freely in reciprocal directions. An extraction hole
2
j,
which is a small hole that connects the surface of the base plate
2
a
facing the fixed scroll
1
(the upper side surface in
FIG. 5
) with the surface of the base plate
2
a
on the compliant frame
3
side (the lower side surface in FIG.
5
), is formed in the base plate
2
a.
The center locus of the aperture of the extraction hole
2
j
in the surface on the compliant frame
3
side, namely, the lower surface aperture
2
k
opens onto a position normally facing the thrust bearing
3
a
of the compliant frame
3
during
A main support bearing
3
c,
which supports a crankshaft
4
in a radial direction, and an auxiliary main shaft
3
h
are formed at a central portion of the compliant frame
3
. The crankshaft
4
is driven to rotate by the electric motor section. A connecting hole
3
s
that connects a frame space
15
f
to the thrust bearing
3
a
is formed in the compliant frame
3
.
A connecting hole
3
n
that connects a base plate outer peripheral space
2
i
to a frame space
15
h
is also formed in the compliant frame
3
. An adjusting valve housing space
3
p
is also formed in the compliant frame
3
. One end of the adjusting valve housing space
3
p
is connected via an adjusting valve front flow path
3
j
to a boss exterior space
2
h,
while the other end of the adjusting valve housing space
3
p
is connected via the connecting hole
3
n
to the base plate outer peripheral space
2
i.
In one end of the adjusting valve housing space
3
p
is housed an intermediate pressure adjusting valve
3
l
that is capable of free reciprocal operation. In the opposite end of the adjusting valve housing space
3
p
is housed an intermediate pressure adjusting spring cap
3
t
that is fixed to the compliant frame
3
. Between the intermediate pressure adjusting valve
3
l
and the intermediate pressure adjusting spring cap
3
t
is positioned an intermediate pressure adjusting spring
3
m
that is compressed beyond its natural length. The intermediate pressure adjusting spring
3
m
urges the intermediate pressure adjusting valve
3
l
towards the adjusting valve front flow path
3
j.
The outer peripheral surface of the guide frame
15
is fastened to an internal surface of the sealed container
10
by shrink fitting or welding or the like. However, a flow path is secured to guide high pressure refrigerant gas discharged from a discharge port
1
f
of the fixed scroll
1
to a discharge pipe
10
b
provided on the electric motor side of the guide frame
15
(i.e., on the lower side in FIG.
5
).
An upper meshing circumferential inner surface
15
a
is formed on the fixed scroll
1
side (i.e., on the upper side in
FIG. 5
) of the inner surface of the guide frame
15
. The upper meshing circumferential inner surface
15
a
abuts against an upper meshing circumferential outer surface
3
d
formed on the outer peripheral surface of the compliant frame
3
.
A lower meshing circumferential inner surface
15
b
is formed on the electric motor side (i.e., on the lower side in
FIG. 5
) of the inner surface of the guide frame
15
. The lower meshing circumferential inner surface
15
b
abuts against a lower meshing circumferential outer surface
3
e
formed on the outer peripheral surface of the compliant frame
3
. Annular sealing grooves which house sealing members
16
a
and
16
b
are formed in two rows on the inner surface of the guide frame
15
. The annular upper sealing member
16
a
and the lower sealing member
16
b
are each fitted into the respective sealing groove.
A space formed by the two sealing members
16
a
and
16
b,
the inner surface of the guide frame
15
and the outer surface of the compliant frame
3
forms the frame space
15
f.
A space on the outer peripheral side of the thrust bearing
3
a
enclosed at top and bottom by the base plate
2
a
of the orbiting scroll and the compliant frame
3
, namely, a base plate outer peripheral space
2
i
is connected to an intake space
1
g,
which is adjacent to the end of the outer winding of the plate shaped spiral teeth
1
b,
and forms a low pressure space of an intake gas atmosphere (intake pressure).
An eccentric portion
4
b
of the crankshaft
4
that is supported so as to be freely rotatable by the bearing
2
c
of the orbiting scroll
2
is formed at the orbiting scroll
2
end of the crankshaft
4
(i.e., at the upper side in FIG.
5
). Below that is formed a main portion
4
c
of the crankshaft
4
that is supported so as to be freely rotatable by the main bearing
3
c
and the auxiliary main bearing
3
c
and the auxiliary main bearing
3
h
of the compliant frame
3
. At the other end of the crankshaft
4
is formed a sub portion
4
d
of the crankshaft
4
that is supported so as to be freely rotatable by a sub bearing
6
a
of a sub frame
6
. Between this sub portion
4
d
of the crankshaft
4
and the aforementioned main portion
4
c
of the crankshaft
4
is shrink fitted a rotator
8
of the electric motor. An oil pipe
4
f
is press inserted in the bottom end surface of the crankshaft
4
. Refrigerating machine oil
10
e
that is held in the bottom portion of the sealed container
10
is suctioned up into a high pressure
Fushiki Takeshi
Ikeda Kiyoharu
Nishiki Teruhiko
Ogawa Yoshihide
Sano Fumiaki
Denion Thomas
Mitsubishi Denki & Kabushiki Kaisha
Trieu Theresa
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