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
Vrablik, John J. (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C418S055400
Reexamination Certificate
active
06171085
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a compressor, and more particularly to a compressor of an air conditioner used in automobile and other vehicles.
BACKGROUND OF THE INVENTION
A conventional scroll compressor (hereinafter abbreviated as compressor) comprises, as shown in
FIG. 4
, 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 seal mechanism having an O-ring
41
is placed between the inner circumference
32
a
of the rear casing
32
and the fixed scroll
39
. This seal mechanism 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 seal member
45
, by using bolt
44
or other bonding member. The 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 between the suction pressure and atmospheric pressure was constituted.
Generally, when mounting a compressor of an air compressor on a vehicle, it is required to be high in the precision of pitch of the plurality of the mounting bases
32
b
of the compressor main body, precision of alignment of electromagnetic clutch, precision of discharge port and suction port pitch, and precision between these adjacent elements. In such conventional compressor, however, the front cover
31
having the mounting section
31
c
for the electromagnetic clutch
38
is composed of a separate part from the rear casing
32
having the plurality of mounting bases
32
b,
suction port
32
c
and discharge port
32
d.
Accordingly, the both parts of the front cover
31
and rear casing
32
must be heightened in the precision, including the machining tolerance in both axial direction and rotating direction and tolerance in assembling. The invention presents a compressor easily matched with the requirements of the vehicle to be used.
SUMMARY OF THE INVENTION
The compressor of the invention comprises a front casing having an opening at the rear part, and a rear cover disposed so as to seal the opening. The front casing includes a bottom, a side wall, a base for mounting the compressor outside, and a suction port for sucking a refrigerant. A compression unit is disposed in the front casing. A shaft coupled to the compression unit is exposed outside from a mounting penetration hole.
Preferably, the compression unit has a fixed scroll and a movable scroll. The movable scroll swivels by rotation of the shaft. The fixed scroll has a discharge hole. The bottom, side wall, and fixed scroll form a suction chamber. The fixed scroll and rear cover form a discharge chamber. The refrigerant enters the suction chamber through a suction port, and is compressed by the movable scroll and fixed scroll. The compressed refrigerant is discharge into the discharge chamber through the discharge hole, and is discharged from the discharge chamber through the discharge port.
Preferably, the front casing integrally includes a discharge port for discharging the refrigerant.
Preferably, comprising a first seal mechanism and a second seal mechanism, the first seal mechanism is placed among the front casing, fixed scroll and rear cover, and seals between the suction pressure and discharge pressure. The second seal mechanism is placed between the rear cover and the front casing, and seals between the discharge pressure and atmospheric pressure.
Preferably, it further comprises a rotation preventive mechanism accommodated in the front casing, for allowing the movable scroll to swivel only while preventing rotation. The movable scroll is engaged with the fixed scroll, and is allowed to swivel only by the rotation preventive mechanism, and the refrigerant is compressed by the swivel motion of the movable scroll and the fixed scroll.
Preferably, it further comprises an electromagnetic clutch disposed outside of the bottom of the front casing and coupled to the shaft.
Preferably, the rear cover has a hole formed in the outer circumference, and a space serving as passage of the refrigerant is formed between this outer circumference and the inner circumference of the front casing.
Preferably, the front casing has a step so that the diameter of a first fitting portion of the rear cover and front casing may be larger than the diameter of a second fitting portion of the fixed scroll and front casing.
In this constitution, the mounting penetration hole, mounting base, and suction port are provided integrally in the front casing. Accordingly, by controlling only the machining precision of the front casing, the precision of alignment of electromagnetic clutch, precision of pitch of mounting bases, and precision of pitch of suction port and discharge port may be matched with the specification of the vehicle, so that it can be mounted easily and accurately on the vehicle or other external apparatus.
REFERENCES:
patent: 4432708 (1984-02-01), Hiraga et al.
patent: 4484869 (1984-11-01), Nakayama et al.
patent: 5954489 (1999-09-01), Kinoshita
patent: 354332 (1961-06-01), None
patent: 3114040 (1982-02-01), None
patent: 507626 (1954-12-01), None
patent: 63-158594 (1988-10-01), None
patent: 4-143477 (1992-05-01), None
patent: 7-332266 (1995-12-01), None
patent: 9-203388 (1997-05-01), None
Matsushita Electric - Industrial Co., Ltd.
Ratner & Prestia
Vrablik John J.
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