Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
1999-09-08
2001-06-19
Vrablik, John J. (Department: 3746)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C029S464000, C029S888022
Reexamination Certificate
active
06247910
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates in general to a scroll type compressor and a method of manufacturing the scroll type compressor more particularly to a scroll type compressor which is assembled by conforming all parts and elements in the assembly procedure and the assembly method thereof.
Such a first conventional scroll type compressor is disclosed In Japanese Patent No. 2,713,652 and is shown in
FIG. 5
of the attached drawing. The conventional scroll type compressor has a housing
1
formed by separately assembling each part thereof. The housing
1
has a cup-shaped casing
2
, a front case
4
which is coupled with the cup-shaped casing
2
by a bolt
3
and closes one end of the casing
2
, and a front cover
6
coupled to the front case
4
by a bolt
5
. The front cover
6
has a cylindrical axial hole
6
a
at Its central portion and a rotational shaft
7
which is extended through the axial hole
6
a
is rotatably supported by the housing
1
through bearings
8
and
9
.
In a hollow space defined by the housing
1
, a fixed scroll member
10
and a movable scroll member
14
are provided. The fixed scroll member
10
has an end plate
11
and an involute wrap
12
which is astended from and provided on an inner surface of the end plate
11
. An outer circumferential surface of the and plate
11
is closely contacted with an inner circumferential surface of the casing
2
through a sealing ring
35
to thereby provide a partition for the interior of the housing
1
. So that, a discharge cavity
31
is confined on the outer side of the and plate
11
, a suction chamber
32
being confined on the inner side of the end plate
11
. The fixed scroll member
10
is fixed to the casing
2
by the bolts
13
which are inserted through the holes
33
of a bottom
2
a
of the casing
2
and threadedly engaged with threaded hole
34
of the end plate
The movable scroll member
14
, on the other hand, has an end plate
15
and an involute wrap
16
which is extended from and provided on the inner surface of the end plate
15
. The involute wrap
16
of the movable scroll member
14
is substantially same in configuration as the involute wrap
12
of the fixed scroll member
10
.
The movable scroll member
14
and the fixed scroll member
10
are eccentrically offset by a predetermined distance with each other and are offset at 180° and engaged with each other as illustrated in
FIG. 5. A
tip seal
17
is embedded in a front end portion of the involute wrap
12
. The tip seal
17
is closely contacted with the inner surface of the end plate
15
. Similarly, a tip seal
18
to embedded in a front end portion of the involute wrap
16
. The tip seal
18
is closely contacted with the inner surface of the and plate
11
. The side surfaces of the involute wraps
12
and
16
are line-contacted with each other at a plurality of locations on the side surfaces. Thus, a plurality of sealed chambers
19
a
and
19
b
are confined in a point-symmetrical relation relative to a center of the involute curve.
The end plate
15
is provided at its central portion a cylindrical boss
20
in which a bush
21
is rotatably mounted through an orbital bearing
23
. The bush
21
is provided with an eccentric hole
24
in which an eccentric pin
25
, which is disposed to an inner end of the rotational shaft
7
, is rotatably fitted. A balance weight
27
is fixed to the bush
21
. A rotation prevention mechanism
26
comprises an Oldham ring and a thrust pad member
36
and to provided between an outer circumferential end of the outer surface of the end plate
15
and the end surface of the front case
4
.
When the rotational shaft is driven, the movable scroll member
14
is driven through an orbital driving mechanism consisting of the eccentric pin
25
, bush
21
, orbital bearing
23
, boss
20
, and others. In this event, the movable scroll member
14
is subject to an orbital motion with its rotating motion being prevented by the rotation prevention mechanism
26
.
By the orbital motion of the movable scroll member
14
, an line-contact portion between the two involute wraps
12
and
16
is shifted toward a center of the involute (spiral-shaped) structure of the wraps. Consequently, the sealed small chambers
19
a
and
19
b
are moved toward the center of the Involute with their volume decreasing.
Then, gas is sucked into a suction chamber
32
through a suction port (not shown) and introduced into the sealed small chambers
19
a
and
19
b
through an outer and opening portion relative to the involute wraps
12
and
16
and delivered into the center chamber
22
while it is compressed. Then the compressed gas is fed through a discharge port
29
, which is fitted to the end plate
11
of the fixed scroll member
10
, to forcibly open a discharge valve
30
and then fed into a discharge cavity
31
and, finally discharged out of the housing
1
through a discharge port (not shown).
The casing
2
has at its open end portion a flange portion
2
c
which has a plurality of threaded holes
2
d
for engagement with bolts
3
and a first positioning hole
53
. The front case
4
is provided with a flange portion
4
a
coupled with the flange portion
2
c
of the casing
2
. The _flange portion
4
a
of the front case
4
has a plurality of holes
4
d
for receiving bolts
3
and a second positioning hole
54
. The second positioning hole
54
can be matched with the first positioning hole
53
only in the case that a relation between the casing
2
and the front case
4
occupies a predetermined relative angle.
In a method of assembly of or manufacturing the scroll type compressor, a front cover
6
, the movable scroll member
14
, the orbital driving mechanism, the rotation prevention mechanism
26
, the thrust pad member
36
, and others are mounted to the front casing
4
. The movable scroll member
14
and the front case
4
are assembled in a regular relative angle with each other.
The fixed scroll member
10
is inserted into the casing
2
through its one end opening. The casing
2
and the fixed scroll member
10
are coupled together by the bolts
13
so that the casing
2
and the fixed scroll member
10
are coupled together in a regular relative angle with each other.
Then, as shown in
FIG. 6
, a positioning rod
55
is inserted into the hole
53
of the housing assembly
51
and the hole
54
of the front case assembly
52
so that the holes
53
and
54
are aligned with each other. Then, the flange portion
4
a
of the front case
4
is fitted by means of the bolt
3
.
Another conventional scroll type compressor is shown in
FIGS. 7 and 8
. The casing
2
is coupled with the front housing
46
by means of the bolt
3
which is shown in FIG.
5
. Namely, the front housing
46
is a unitary portion consisted with the front case
4
and the front cover
6
shown in FIG.
5
.
The front housing
46
is provided, at its outer circumferential portion, with a plurality of flange portions
4
a
an shown in FIG.
5
. The flange portion
4
a
is provided with a plurality of holes
4
d
for the bolts
3
. The casing
2
is provided at its outer circumferential portion with a plurality of flange portion
2
c
and the flange portion
2
c
has a plurality of threaded hole
2
d
for the bolts
3
.
One of the flange portions
2
c
of the opening end of the casing
2
has a hole
53
which constitute a first positioning portion. The flange portion
4
a
of the front housing
46
has the hole
54
as a second positioning portion such that the hole
53
as the first positioning portion is aligned with the hole
54
of the second positioning portion only when the casing
2
on which the fixed scroll member
10
is mounted has a predetermined relative angular degree with respect to the font housing
46
on which movable scroll member
14
, orbital motion mechanism, rotation prevention mechanism
26
are mounted.
By inserting the positioning rod
55
into the hole
54
of the front housing
46
and the hole
53
of the casing
2
, the holes
53
and
54
are aligned with each oth
Baker & Botts L.L.P.
Sanden Corporation
Vrablik John J.
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