Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
2002-09-30
2004-08-03
Demon, Thomas (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C418S057000, C418S055400, C418S055600
Reexamination Certificate
active
06769887
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a refrigerant compressor for use in refrigerating/air-conditioning equipment.
BACKGROUND ART
FIG. 7
is a longitudinal sectional view showing the construction of a conventional scroll compressor disclosed in JP-A-2000-161254.
In
FIG. 7
, numeral
1
designates a fixed scroll having its outer circumferential portion fastened to a guide frame
15
by means of bolts (not shown). Plate-like scroll teeth
1
b
are formed on one surface (lower side in
FIG. 7
) of a base plate portion
1
a
. In addition, two Oldham's guide grooves
1
c
are formed substantially in a straight line in the outer circumferential portion. A claw
9
c
of an Oldham's ring
9
is reciprocally slidably engaged with each of the Oldham's guide grooves
1
c
. Further, from a side surface of the fixed scroll
1
, a suction pipe
10
a
is press fitted through a closed vessel
10
.
Numeral
2
designates an oscillating scroll, and plate-like scroll teeth
2
b
having substantially the same shape as the plate-like scroll teeth
1
b
of the fixed scroll
1
are provided on the upper surface of a base plate portion
2
a
. Thus, a compression chamber
1
d
is formed geometrically. A hollow cylindrical boss portion
2
f
is formed in the center portion of that surface of the base plate portion
2
a
which is opposite to the plate-like scroll teeth
2
b
. An oscillating bearing
2
c
is formed on the inner surface of the boss portion
2
f
. In addition, a thrust surface
2
d
which can slide in pressure contact with a thrust bearing
3
a
of a compliant frame
3
, is formed on the same side surface as the boss portion
2
f
but on an outer side than the boss portion
2
f
. In the outer circumferential portion of the oscillating scroll base plate portion
2
a
, two Oldham's guide grooves
2
e
are formed substantially in a straight line to have a phase difference of 90 degrees with respect to the Oldham's guide grooves
1
c
of the fixed scroll
1
. A claw
9
a
of the Oldham's ring
9
is reciprocally slidably engaged with each of the Oldham's guide grooves
2
e
. An extraction hole
2
j
is also provided in the base plate portion
2
a
so as to extend from the compression chamber
1
d
through the thrust surface
2
d
. An aperture portion
2
k
of the extraction hole
2
j
on the side of the thrust surface
2
d
is located so that the circular locus of the aperture portion
2
k
always stays inside the thrust bearing surface
3
a
of the compliant frame
3
.
The compliant frame
3
has two upper and lower cylindrical surfaces
3
d
and
3
e
in its outer circumferential portion. The cylindrical surfaces
3
d
and
3
e
are supported in the radial direction of the scroll compressor by cylindrical surfaces
15
a
and
15
b
provided in the inner circumferential portion of the guide frame
15
, respectively. A main bearing
3
c
and an auxiliary main bearing
3
h
for supporting a main shaft
4
in the radial direction of the scroll compressor are formed in the center portions of the compliant frame
3
. The main shaft
4
is driven to rotate by a motor
7
. In addition, between the outside of the compliant frame
3
and the inside of the guide frame
15
, a frame space
15
f
is defined by sealing materials
16
a
and
16
b
disposed on cylindrical surfaces
15
c
and
15
d
, respectively. The frame space
15
f
communicates with the compression chamber
1
d
through a communication passageway
3
s
and the extraction hole
2
i
which are interconnected via the surface of the thrust bearing
3
a
. Thus, the frame space
15
f
is filled with refrigerant gas which is supplied from the compression chamber
1
d
and which is on the way of compression.
A regulating valve receiving space
3
p
is also formed in the compliant frame
3
. One end (lower end in
FIG. 7
) of the regulating valve receiving space
3
p
communicates with a boss portion outside space
2
h
. The boss portion outside space
2
h
is constituted by the inner circumference of the compliant frame
3
and the thrust surface
2
d
of the oscillating scroll
2
. On the other hand, the other end (upper end in
FIG. 7
) of the regulating valve receiving space
3
p
is made open to a suction pressure atmosphere space
1
g
. An intermediate pressure regulating valve
3
i
is reciprocally movably received in the lower portion of the regulating valve receiving space
3
p
. On the other hand, received in the upper portion of the regulating valve receiving space
3
p
is an intermediate pressure regulating spring retainer
3
t
fixedly attached to the compliant frame
3
. Between the intermediate pressure regulating valve
3
i
and the intermediate pressure regulating spring retainer
3
t
, an intermediate pressure regulating spring
3
m
is received in such a manner that the spring
3
m
is made shorter than its natural length.
An outer circumferential surface
15
g
of the guide frame
15
is fixedly attached to the closed vessel
10
by shrink-fitting, welding, or the like. However, a channel is ensured by a notch portion
15
h
provided in the outer circumferential portion of the guide frame
15
. Thus, high pressure refrigerant gas discharged from a discharge port
1
f
of the fixed scroll
1
is directed through the channel to a discharge pipe
10
b
provided on the motor side.
Numeral
4
designates a main shaft and an oscillating shaft
4
b
is formed in the upper end portion of the main shaft
4
. The oscillating shaft
4
b
is rotatably engaged with the oscillating bearing
2
c
of the oscillating scroll
2
. A main shaft balancer
4
e
is shrink-fitted in the lower portion of the oscillating shaft
4
b
. Further, under the main shaft balancer
4
e
, a main shaft portion
4
c
is formed so as to be rotatably engaged with the main bearing
3
c
and the auxiliary main bearing
3
h
of the compliant frame
3
. In addition, an auxiliary shaft portion
4
d
is formed in the lower portion of the main shaft
4
so as to be rotatably engaged with an auxiliary bearing
6
a
of a sub-frame
6
. A rotor
8
is shrink-fitted between the auxiliary shaft portion
4
d
and the main shaft portion
4
c.
An upper balancer
8
a
is fixed to the upper end surface of the rotor
8
and a lower balancer
8
b
is fixed to the lower end surface of the rotor
8
. Static balance and dynamic balance are ensured by the total of three balancers including the upper and lower balancers
8
a
and
8
b
in addition to the above-mentioned main shaft balancer
4
e
. Further, an oil pipe
4
f
is force fitted into the lower end of the main shaft
4
. Thus, refrigerating machine oil
10
e
retained in the bottom portion of the closed vessel
10
is sucked up through the oil pipe
4
f.
A glass terminal board
10
f
is provided at the side surface of the closed vessel
10
. The motor
7
is connected with the glass terminal board
10
f
through lead wires.
Next, description will be made about the basic operation of the conventional scroll compressor.
A sucked refrigerant of low pressure enters the compression chamber
1
d
through the suction pipe
10
a
. The compression chamber id is defined by the plate-like scroll teeth of the fixed scroll
1
and the plate-like scroll teeth of the oscillating scroll
2
. The oscillating scroll
2
driven by the motor
7
makes an eccentric turning motion while reducing the volume of the compression chamber
1
d
. On this compression stroke, the sucked refrigerant becomes high in pressure. Thus, the sucked refrigerant is discharged into the closed vessel
10
through the discharge port if of the fixed scroll
1
.
On the other hand, the refrigerant gas of intermediate pressure on the way of compression on the above-mentioned compression stroke is directed from the extraction hole
2
j
of the oscillating scroll
2
to the frame space
15
f
through the communication passageway
3
s
of the compliant frame
3
, so that the intermediate pressure atmosphere in this space is maintained.
The discharged gas of the high pressure fills the closed vessel
10
with the high pressure at
Fushiki Takeshi
Ikeda Kiyoharu
Nishiki Teruhiko
Ogawa Yoshihide
Sano Fumiaki
Demon Thomas
Mitsubishi Denki & Kabushiki Kaisha
Trieu Theresa
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