Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
1999-06-28
2001-01-09
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C418S149000, C092S072000, C415S215100
Reexamination Certificate
active
06171087
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a compressor, and more particularly to a compressor used in an air conditioner or the like, and an assembling method thereof.
BACKGROUND OF THE INVENTION
A conventional scroll compressor comprises, as shown in
FIG. 6
, a rear casing
32
having an opening at the front side, and a front cover
31
placed in its opening. A movable scroll
34
, a fixed scroll
39
, and a rotation preventive mechanism
36
are disposed in the rear casing
32
. An outer circumference of the fixed scroll
39
contacts with an inner circumference of the rear casing
32
. The movable scroll
34
is placed between the front cover
31
and the fixed scroll
39
in order to swivel while contacting with the surface of the fixed scroll
39
. The rotation preventive mechanism
36
is placed between the movable scroll
34
and the front cover
31
in order to allow the swivel motion only while preventing rotation of the movable scroll
34
. A suction chamber
46
for sucking a refrigerant and a discharge chamber
47
for discharging the refrigerant are mutually partitioned through the fixed scroll
39
. A suction port
32
c
for sucking the refrigerant is formed in an outer wall of the rear casing
32
of the suction chamber
46
. A discharge port
32
d
for discharging the refrigerant is formed in the outer wall of the rear casing
32
of the discharge chamber
47
. A first seal member
41
having an O-ring
41
is placed between the inner circumference
32
a
of the rear casing
32
and the fixed scroll
39
. This first seal member
41
seals between the fixed scroll
39
and the rear casing
32
. It is thus completely sealed between the suction chamber
46
and discharge chamber
47
.
A plurality of mounting bases
32
b
for mounting on a vehicle or other mechanical structure are integrally disposed on the outer wall of the rear casing
32
. The front cover
31
has a clutch mounting section
31
c
. A shaft
40
is installed so as to cooperate with the movable scroll
34
, and this shaft
40
penetrates through the clutch mounting section
31
c, and has its leading end exposed outside. An electromagnetic clutch
38
is installed outside of the clutch mounting section
31
c
, and is coupled to the shaft
40
. The front cover
31
is coupled to the rear casing
32
through a second seal member
45
, by using bolt
44
or other bonding member. The second seal member
45
seals between the front cover
31
and rear casing
32
, and by this seal member
45
, the suction chamber
46
and the outside are completely isolated. Thus, a pressure vessel sealing mutually between the suction pressure and atmospheric pressure was constituted by using the first seal member
41
and second seal member
45
.
In such conventional compressor, however, the rear casing cover
32
is manufactured separately from the front cover
31
, and the rear casing
32
and front cover
31
are coupled through the second seal member when assembling by using bolt
44
or other coupling member. Further, mounting bases
32
b
are integrally formed in the rear casing
32
, and a movable scroll
34
and a shaft
40
linked to the electromagnetic clutch are fitted to the front cover
31
. Thus, the member and bases
32
b
for fixing the shaft
40
are mutually fitted to different parts.
Accordingly, when the compressor is mounted on the apparatus, it is required to match accurately the precision of mutual positions of the outer member and bases
32
b
coupled to the shaft
40
, and the mounting work was complicated.
SUMMARY OF THE INVENTION
The compressor of the invention comprises:
(a) a front casing having a bottom, an opening, a first inner circumference, and a second inner circumference,
(b) a compression unit disposed in the front casing,
(d) a rear cover disposed to cover the opening,
(e) a first seal member disposed between the compression unit and the first inner circumference,
(f) a second seal member disposed between the rear cover and the second inner circumference,
(g) a suction chamber surrounded by the compression unit and the bottom, and
(h) a discharge chamber surrounded by the compression unit and the rear cover.
The compression unit and the rear cover are mutually coupled, the compression unit has a first fitting portion to be fitted to the first inner circumference and a first seal groove formed in the first fitting portion, the rear cover has a second fitting portion to be fitted to the second inner circumference and a second seal groove formed in the second fitting portion, the second inner circumference is positioned at the side closer to the opening than the first inner circumference, the first seal member is disposed in the first seal groove, the second seal member is disposed in the second seal groove, the fitting gap A between the first fitting portion and first inner circumference is larger than the fitting gap B of the second fitting portion and second inner circumference, and the compression unit and rear cover mounting the first seal member and second seal member can be inserted into the front casing from the opening side.
The assembling method of compressor of the invention comprises:
(a) a step of feeding a front casing having a first inner circumference, a second inner circumference, an opening and a bottom, a compression unit having a first fitting portion and a first seal groove, and a rear cover having a second fitting portion and a second seal groove,
(b) a step of installing a first seal member in the fist seal groove,
(c) a step of installing s second seal member in the second seal groove,
(e) a step of installing a fixed scroll on the front casing, while fitting the first fitting portion to the first inner circumference, and
(f) a step of installing the rear cover to the front casing so as to cover the opening, while fitting the second fitting portion to the second inner circumference.
The fitting gap “A” between the first fitting portion and first inner circumference is larger than the fitting gap “B” of the second fitting portion and second inner circumference, and the compression unit and rear cover mutually coupled and mounting the first seal member and second seal member are inserted into the front casing from the opening.
Preferably, when inserting the compression unit and rear cover into the front casing, before the first seal member is fitted to the first inner circumference, the first fitting portion is fitted to the first inner circumference, and before the second seal member is fitted to the second inner circumference, the second fitting portion is fitted to the second inner circumference.
Preferably, it further comprises a crankshaft projecting outside from the bottom.
Preferably, the compression unit has a fixed scroll and a swivel scroll, and the first fitting portion and the first seal groove are formed in the fixed scroll.
Preferably, both the first seal member and the second seal member are positioned so that the first fitting portion may be fitted to the first inner circumference and that the second fitting portion may be fitted to the second inner circumference before the first seal member is fitted to the first inner circumference and the second seal member is fitted to the second inner circumference.
In this constitution, the mutual position of the mounting bases of the compressor and the outer member (the other apparatus) may be precision, and it can be mounted easily and accurately on the outer member or the other apparatus. And further, when assembling the compression unit into the front casting, by preliminarily assembling the rear cover and the compression unit, it is possible to assemble easily into the front casing, in the assembled state of the seal members for sealing between the suction pressure and discharge pressure and sealing between the discharge pressure and atmospheric pressure. Moreover, the seal member (O-ring) is not cut off at the edge of the discharge port, and an easy-to-assemble compressor is obtained.
Moreover, if the compression unit is a scroll compression unit, by preliminarily assembling the fixed s
Inaba Mitsunori
Iwasa Makoto
Ogawa Nobuaki
Denion Thomas
Matsushita Electric - Industrial Co., Ltd.
Ratner & Prestia
Trieu Theresa
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