Pumps – Combined
Reexamination Certificate
2001-07-14
2003-07-29
Freay, Charles G. (Department: 3746)
Pumps
Combined
C418SDIG001, C184S006160, C184S006230
Reexamination Certificate
active
06599101
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a gas compressor assembled into an air-conditioning system for a vehicle or the like, and more particularly to a gas compressor in which it is possible to reduce a cost for the overall compressor without deteriorating its oil component separating function that is needed for the compressor, and to keep the oil component separating function constant for a long period of time.
In order to attain he above-described problems, a first object of the present invention is to provide a gas compressor that is suitable for reducing the overall manufacturing cost while attaining a reduction in the number of assembling steps and the parts relating to the oil separator. A second object of the present invention is to provide a gas compressor provided with an oil separator that is high in reliability to make it possible to keep a constant oil separation function that is needed for the compressor for a long period of time.
2. Description of the Related Art
In this kind of a conventional gas compressor, as shown in, for example,
FIG. 11
, a cylinder
2
having a substantially oval-shaped inner circumference is provided within a compressor case
1
and side blocks
3
and
4
are mounted at both end faces of the cylinder
2
.
In order to achieve the above-mentioned objects according to the present invention, a gas compressor comprises a cylinder disposed in a compressor case, side blocks mounted on both end faces of the cylinder, a cylinder discharge port for discharging high pressure cooling medium gas which contains lubricant oil compressed in a compression chamber within the cylinder to a first discharge chamber that is an outside space of the cylinder, a second discharge chamber provided between an inner sealed end of the compressor and one of the side blocks, and an oil separator for separating lubricant oil component contained in the high pressure cooling medium gas to be introduced from the first discharge chamber to the second discharge chamber side. The oil separator is formed of a discharge pipe integral with one of the blocks and has an opening at one end to the first discharge chamber side with the other end opened toward an inner wall of the compressor case.
A rotor
7
is laterally provided inside the cylinder
2
. The rotor
7
is supported rotatably through bearings
9
of the side blocks
3
and
4
and a rotor shaft
8
extending along the axis thereof. Also, as shown in
FIG. 12
, a plurality of slit-like vane grooves
11
are formed radially on the outer circumferential surface side of the rotor
7
. Vanes
12
are mounted on these vane grooves
11
one by one. The vanes
12
are provided to be retractable and projectable from the outer circumferential surface of the rotor
7
toward the inner wall of the cylinder
2
.
The interior of the cylinder
2
is partitioned into a plurality of small chambers by both surfaces at a tip end of each vane
12
, outer circumferential surface of the rotor
7
, inner surfaces of the side blocks
3
and
4
and the inner wall of the cylinder
2
. The small chamber thus partitioned is a compression chamber
13
. Such a compression chamber
13
within the cylinder
2
is rotated in a direction indicated by an arrow a in
FIG. 12
to repeats the change in volume.
When the volume of the compression chamber
13
is changed, upon the increase of the volumes a low pressure cooling medium gas within the suction chamber
6
is sucked into the compression chamber
13
through suction inlets
15
of the side blocks
3
and
4
and suction passages
14
such as the cylinder
2
. Then, when the volume of the compression chamber
13
is started to be reduced, the cooling medium gas of the compression chamber
13
is started to be compressed by the reduction in volume. Thereafter when the volume of the compression chamber
13
is close to the minimum level, a reed valve
17
of a cylinder discharge hole
16
provided at the oval short diameter portion of the cylinder is opened. Thus, the high pressure cooling medium gas within a compression chamber
10
is discharged to a first discharge chamber
18
of the outer space of the cylinder
1
from the cylinder discharge port
16
and further introduced through a gas passage
19
and an oil separator
20
to the side of the second discharge in chamber
5
. In this case, lubricant is contained in the form of mist in the high pressure cooling medium gas discharged to the first discharge chamber
18
. The lubricant oil component is separated by the collision with the oil separating filter
21
composed of metal mesh or the like for the oil separator
20
.
Note that also as shown in
FIG. 13
, the lubricant oil component thus separated is dropped and reserved in an oil sump
22
of the bottom portion of the second discharge chamber
5
. Also, the pressure of the high pressure cooling medium gas discharged into the second discharge chamber
5
is applied to the oil sump
22
. The oil in the oil sump
22
to which such discharge pressure Pd is applied is fed to a back pressure chamber
25
of the bottom portion of the vane
12
passing through the side blocks
3
and
4
, an oil hole
23
of the cylinder
1
, the gap of the bearing
9
and a supply groove
24
formed in the surfaces, facing each other, of the side blocks
3
and
4
in this order.
However, in the above-described conventional gas compressor, as shown in
FIG. 11
, the side block
3
and the oil separator
20
are formed as discrete parts in view of the relationship of the structure in which the gas passage
19
for introducing to the oil separator
20
side the high pressure cooling medium gas containing the lubricant is formed between the mounting alignment surfaces of the side block
3
and the oil separator
20
. For this reason, not only may a large number of parts such as an oil separator fastening bolt
26
(see
FIG. 13
) for mounting the oil separator
20
to the side block
3
, a seal member for the mounting portion or the like be required, but also the assembling step for assembling the oil separator
20
to the side block
3
in the compressor manufacturing line. Thus, there are many factors for increasing cost, resulting in increase in cost for the overall compressor.
Also, in the above-described conventional gas compressor, as shown in
FIG. 13
, the oil separator
20
is fixed to the side block
3
by oil separator fastening bolts
26
. Accordingly, if there is a defect due to the loosening of the oil separator fastening bolts
26
, for example, when the loosening of the oil separator bolts
26
, the mounting alignment surfaces of the side block
3
and the oil separator
20
are opened to split the gas passage
19
, the high pressure cooling medium gas before the oil separation leaks to the outside of the gas passage
19
from the crack to cause the reduction of the oil separation property or the like. That is, there is a problem in that it is difficult to keep the constant oil separation function for a long period time.
SUMMARY OF THE INVENTION
In order to attain the above-described problems, a first object of the present invention is to provide a gas compressor that is suitable for reducing cost for overall equipment while attaining the reduction of the numbers of assembling steps and the parts relating to the oil separator, and a second object thereof is to provide a gas compressor provided with an oil separator that is high in reliability to make it possible to keep a constant oil separation function that is needed for the compressor for a long period of time.
In order to achieve the above-mentioned objects according to the present invention, a gas compressor comprising a cylinder disposed in a compressor case, side blocks mounted on both end faces of the cylinder, a cylinder discharge port for discharging high pressure cooling medium gas which contains lubricant oil compressed in a compression chamber within the cylinder to a first discharge chamber that is an outside space of the cylinder, a second discharge chamber provided between an inner sea
Matsuura Toshinari
Tohyama Tatsuhiro
Adams & Wilks
Freay Charles G.
Sayoc Emmanuel
Seiko Instruments Inc.
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