Refrigeration – Refrigeration producer – With lubricant handling means
Reexamination Certificate
1999-11-03
2001-05-01
Wayner, William (Department: 3744)
Refrigeration
Refrigeration producer
With lubricant handling means
C029S888020, C252S068000
Reexamination Certificate
active
06223554
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a refrigerant compressor applied to, for example, an air conditioner.
2. Description of the Prior Art
An example of an compressor is shown in FIG.
1
. The compressor shown in
FIG. 1
is the one for air conditioner for car. FIG.
1
(
a
) is a sectional view of the compressor. FIG.
1
(
b
) is a sectional view of compressing-mechanism system. The compressing-mechanism system is constituted mainly of a cylinder
14
(made of iron), a side plate
13
(made of aluminum) for sealing the cylinder
14
, an O-ring
15
for improving the sealing between the cylinder
14
and the side plate
13
, a rotor rotating in the cylinder
14
to compress refrigerant, and a vane
11
(made of aluminum). The rotor
12
rotates as a rotating shaft
20
supported on a needle bearing
19
rotates.
Such a compressor as having the above compressing-mechanism is assembled after an oil for application is applied in advance to the vane
11
, the O-ring
15
and a lip seal
16
etc. After the assemble of the compressor is finished, about 5 cc of an oil for assemble is poured through an intake inlet
17
and enclosed. This oil for assemble is supposed to flow around sliding portions in the compressor, such as a sliding portion between the vane
11
and the side plate
13
, a sliding portion between the vane
11
and the cylinder
14
, a sliding portion between the rotor
12
and the side plate
13
, a sliding portion between the rotor
12
and the cylinder
14
, and a sliding portion between the rotating shaft
20
and the needle bearing
19
. These sliding portions are indicated by the reference number
3
in
FIG. 1. A
lubricating oil
2
is poured through an outlet
18
and enclosed in the compressor
In such a compressor, an oil for applying too parts of the compressor and that for assembly have the same basic ingredients as a lubricating oil to be charged in the compressor. A compatible oil having compatibility with a refrigerant has been used for both this lubricating oil and the oil for application or assembly.
Some techniques use non-compatible oils for the lubricating oil and the oil for application or assembly, which do not have compatibility with a refrigerant, as disclosed in, for example, Japanese Patent Laid-Open Hei 5-157379.
However, the constitution using the above-mentioned compatible oil raises the following problem, for example. The compressor is installed in a car to form such a refrigerant circuit as shown in FIG.
2
. When the car is left under a burning sun in summer, the temperature of evaporator
5
in the car room goes up higher than that of the compressor
1
and a condenser
4
outside the car room in the daytime. The refrigerant is condensed in the compressor
1
and the condenser
4
. The refrigerant dissolves in the lubricating oil particularly well. Then, the sun sets and the temperature difference between the inside and outside of the car disappears. The lubricating oil dissolved in the refrigerant moves from the compressor
1
to the evaporator
5
etc. together with the refrigerant. When this phenomenon is repeated, the lubricating oil goes out of the compressor
1
to move and be held in the condenser
4
and the evaporator
5
etc. in the refrigerant circuit shown in FIG.
2
. Thus, there arises a problem that a failure in lubricity occurred when starting the compressor
1
because of a shortage of the lubricating oil.
Further, under the constitution using a non-compatible oil, the oil discharged into the refrigerant circuit from the compressor
1
remains in the refrigerant circuit without returning to the compressor
1
together with the refrigerant even when the refrigerant was circulated, because the oil does not have compatibility with the refrigerant. Therefore, there arises a problem that a shortage of the lubricating oil in the compressor
1
and abnormal wear particularly at the sliding portions
3
occurred to degrade durability of the compressor
1
.
In the refrigerant circuit using an open system compressor
1
, such an air conditioner for car, two-phase separation between oil and refrigerant occurs when the refrigerant is in short and milkiness is observed at the side glass part
7
of the dryer receiver
6
as shown in FIGS.
3
(
a
) and (
b
). At this time, when the shortage of the refrigerant is supplemented and the required amount of refrigerant is supplied in the refrigerant circuit, the milkiness disappears. Accordingly, the milkiness phenomenon is one of standards on whether the refrigerant should be supplemented.
However, when using a non-compatible oil or a mixture of a compatible oil and a non-compatible oil, two-phase separation of the non-compatible oil from the refrigerant occurs in the refrigerant circuit.
Therefore, even if a suitable amount of the refrigerant is charged in the refrigerant circuit, milkiness is always observed due to the two-phase separation at the side glass part
7
of the dryer receiver
6
to cause a mistake about a shortage of the refrigerant. As a result, this mistake may lead to unnecessary supplement of the refrigerant, resulting in a problem of excess supplement of the refrigerant.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a compressor with high lubricity and improved durability, which can construct a refrigerant circuit with high reliability.
Another object of the present invention is to provide an open-system compressor which can be prevented from excess charging of the refrigerant.
The present invention relates to a compressor in which an oil for applying to parts or that for assembly has non-compatibility with a refrigerant to be charged in a refrigerant circuit and an lubricating oil to be charged in the compressor has compatibility with the refrigerant.
REFERENCES:
patent: 5372737 (1994-12-01), Spauschus
patent: 5419144 (1995-05-01), Kawaguchi et al.
patent: 5600959 (1997-02-01), Gay et al.
patent: 5-157379 (1993-06-01), None
Matsushita Electric - Industrial Co., Ltd.
Wayner William
Wenderoth , Lind & Ponack, L.L.P.
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