Pumps – Combined
Reexamination Certificate
2001-05-18
2003-07-29
Freay, Charles G. (Department: 3746)
Pumps
Combined
C417S366000, C418S055600, C418SDIG001
Reexamination Certificate
active
06599100
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a closed type motor-operated compressor, and mainly relates to the closed type motor-operated compressor for use in air conditioning and refrigerating, in particular, being suitable for achieving improvement on performances of refrigerating cycle thereof.
2. Description of Prior Art
The prior art will be explained by referring to Japanese Patent Laying-open No. Hei 5-99182 (1993) and Japanese Patent Laying-open No. 2000-073977 (2000), in particular, the structure of the closed type motor-operated compressor according to the conventional art, shown in
FIG. 6
attached therewith, while constituent members or elements relating thereto in
FIGS. 7 and 8
.
FIG. 6
is the cross-section view for showing an example of the conventional closed type motor-operated compressor
21
. Namely, in a central portion of a cylindrical case
23
as a main body of a hermetically sealed container
22
, being welded with a cover chamber
24
at the upper portion and with a bottom chamber at the lower portion thereof, a stator
26
a
of a motor
26
is disposed on an outer side while a rotor
26
b
on an inner side, and a compression mechanism portion
27
, which is directly connected to the rotor
26
b
by means of a crankshaft
28
, is disposed in an upper portion thereof. Also, a sub- or auxiliary bearing
33
connected with the lower end side of the crank shaft
28
and a support portion
34
(with bores
34
a
) for supporting the auxiliary bearing
33
, which has a hole or bore for collecting circulating refrigerating machine oil therethrough, are disposed in a lower portion of the case
23
. Also, within the lowest portion of the sealed container
22
on a side of the bottom chamber
25
is enclosed the refrigerating machine oil
35
.
The compressor mechanism portion
27
is formed with a stationary scroll
32
, which is screwed to a frame
29
by means of a bolt(s). The frame
29
comprises a bearing
29
b
for insertion of the crankshaft
28
, and a hole
29
c
for receiving discharge pipe
23
a
. Between the stationary scroll
32
and the frame
29
is provided a rotational scroll
31
. A swirl
31
d
of the rotational scroll
31
and a swirl
32
b
of the stationary scroll
32
are assembled together in such a manner that the rotational scroll
31
is able to wobble freely. The compressor mechanism portion
27
receives the rotational scroll
31
within a step-wise portion
29
a
of the frame
29
, while keeping it freely slidable thereon. In the compressor mechanism portion
27
, for the purpose of preventing the rotational scroll
31
from rotating on its own axis, there is provided an Oldham ring
30
having keys
30
a
, being formed on upper and lower surfaces of the ring, so that they cross at right angles to one another. Those keys
30
a
are inserted into key groove (not shown in the figure) of the frame
29
and the key seats
31
a
of the rotational scroll
31
, respectively.
Oil supply to the compressor mechanism portion
27
is provided, for the purpose of lubricating the crankshaft
28
and the frame
29
, the bearing portions
29
b
and
31
c
of the rotational scroll
31
, and sliding surfaces of the key groove of the rotational scroll
31
and the frame
29
and the keys
30
a
of the Oldham ring
30
, respectively, and also improving a property of gas sealing between the swirls
32
b
and
31
d
of the stationary scroll
32
and the rotational scroll
31
, between a mirror plate
31
b
of the rotational scroll
31
and the step-wise portion
29
a
of the frame
29
, and between end surfaces
32
c
of the stationary scroll
32
, wherein the refrigerating machine oil
35
in a lower portion of the sealed container
22
is loaded at an intermediate pressure between an discharge pressure and a suction pressure of the compressor, so that it is supplied to each portion through an oil supply bore
28
a
opened in a central portion of the crankshaft
28
.
With such the conventional closed type motor-operated compressor
21
already-known, refrigerant gas (hereinafter, “suction gas”), which is enclosed within the refrigerating cycle in advance, is sucked from a suction pipe
24
a
connecting between an external portion of the sealed container
22
and the stationary scroll
32
, due to pumping function of a compressor chamber defined by the swirls
32
b
and
31
d
of the stationary scroll
32
and the rotational scroll
31
, accompanying the rotation of the motor
26
, and after being compressed sequentially, it is discharged within the sealed container
22
, in a form of high pressure gas (hereinafter, “discharge gas”), from a discharge hole
32
a
which is opened in the vicinity of a center of the stationary scroll
32
.
In this instance, the refrigerating machine oil, which is supplied onto the sliding surfaces for improving reliability as was mentioned in the above, as well as the same one that is supplied onto sealing surfaces for improving the property of gas sealing, is mixed with the suction gas to be compressed, and it is discharged into the sealed container
22
under a condition of mist together with the discharge gas. This gas flows out from a discharge pipe
23
a
of the case
23
into the refrigerating cycle (not shown in the figure) in the outside of the sealed container
22
, and the refrigerating machine oil of the mist-like condition adheres in the form of an oil film onto an inner surface of a pipe (not shown in the figure) of the refrigerator, thereby preventing heat radiation in a heat exchanger and reducing down an efficiency in heat exchange thereof, therefore it is impossible to achieve good performance on an air conditioner and refrigerating machines.
Then, in the conventional closed type motor-operated compressor
21
, for suppressing the flow-out of the oil mist contained within the discharge gas into the refrigerating cycle, a shielding space or room
38
is formed by using a lower side of the frame
29
of the compressor mechanism portion
27
, an oil ring
36
between an upper end coil
26
c
of the motor
26
, and an oil cover
37
having a bent portion
37
a
which covers an outer diameter side and an upper surface of the upper end coil
26
c
, wherein a tip of the discharge pipe
23
a
projecting from the case
23
is inserted within the shielding space
38
, penetrating through a cutting
36
a
which is provided in a portion of the above-mentioned oil ring
36
, then no discharge gas flows into the discharge pipe
23
a
directly from a space between the frame
29
and the motor
26
.
Namely, explaining the method for preventing the flow-out of oil mist in more details thereof, the shielding space
38
is formed by using both members of the oil ring
36
mentioned above and the oil cover
37
, while inserting the tip of the discharge pipe
23
a
into the said shielding space
38
, therefore the discharge gas containing the mist-like refrigerating machine oil therein, being discharged from the compressor mechanism portion
27
, as shown by an arrow in the
FIG. 6
, and passing through a space or gap defined by the inner diameter of the case
23
and an outer periphery cut portion
26
f
of a core
26
e
of the motor
26
, goes past lower part end coil
26
d
and up within an air gap between the stator
26
a
and the rotor
26
b
from a lower portion of the motor
26
, thereby being guided to the discharge pipe
23
a.
As a result of this, comparing to the case of no such the shielding space
38
, since the passage of the discharge gas is long and the passage is continuous while being reduced down or expanded in the cross-section area thereof, the mist-like refrigerating machine oil
35
mixed within the discharge gas is separated from, and it is liquefied to drip into the lower portion of the sealed container
22
. The refrigerating machine oil flowing into the refrigerating cycle is restricted in flow-out amount thereof at a certain degree, therefore it is possible to relieve formation of oil film within the pipe of the refrigerating cycle, thereby to improve the
Abe Nobuo
Ishigami Kazuya
Morita Kazunori
Sasaki Yoshihiro
Shimada Masahiro
Antonelli Terry Stout & Kraus LLP
Freay Charles G.
Gray Michael K.
Hitachi , Ltd.
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