Two-cylinder type two-stage compression rotary compressor

Details Two-cylinder type two-stage compression rotary compressor Two-cylinder type two-stage compression rotary compressor

2000-08-29

2001-11-20

Vrablik, John J. (Department: 3748)

Rotary expansible chamber devices

Multistage

Sliding abutment

C418S060000

Reexamination Certificate

active

06318981

ABSTRACT:

BACKGROUND OF THE INVENTION
(i) Field of the Invention
The present invention relates to a two-cylinder type two-stage compression rotary compressor, and more particularly to a two-cylinder type two-stage compression rotary compressor having two cylinders on both sides of, e.g., an intermediate partition plate.
(ii) Description of the Related Art
Conventionally, in this type of rotary compressor, when a refrigerant having a large difference between a high pressure and a low pressure, for example, carbon dioxide (CO
2
) is used, a refrigerant pressure reaches approximately 100 kg/cm
2
G on a high pressure side (high stage side), whilst it is approximately 30 kg/cm
2
G on a low pressure side (low stage side). As a result, a difference between a high pressure and a low pressure becomes as large as approximately 70 kg/cm
2
G.
Therefore, when a cross-sectional shape of a connecting portion for connecting two eccentric portions provided to a rotating shaft of a two-cylinder type two-stage compression rotary compressor with a phase difference of 180° is a circular form coaxial with the both eccentric portions, the cross-sectional area which can be physically assured becomes small. Thus, in case of the above-described refrigerant having a high working pressure, i.e., the carbon dioxide (CO
2
), a large difference between a high pressure and a low pressure increases a burden imposed on the rotating shaft, which involves such a problem as that the rotating shaft is apt to be elastically deformed.
When the rotating shaft is elastically deformed in this manner, one side of the rotating shaft is brought into contact with a bearing portion to cause an abnormal abrasion to reduce the durability, and vibrations or noises are also generated.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention is to provide a two-cylinder type two-stage compression rotary compressor which has the excellent durability for preventing a rotating shaft from being elastically deformed even if a refrigerant having a high working pressure is used.
The present invention provides a two-cylinder type two-stage compression rotary compressor comprising: a closed container; an electric motor portion accommodated in the closed container; two cylinders driven by a rotating shaft of the electric motor portion; and a rotary compression mechanism portion which eccentrically rotates a roller fitted to an eccentric portion provided to the rotating shaft in each cylinder, partitions the inside of each cylinder by a vane, and sucks, compresses and discharges a refrigerant gas, the rotary compression mechanism portion including: a low stage side compression portion which sucks and compresses a low pressure refrigerant gas, a high stage side compression portion which sucks and compresses the refrigerant gas which has compressed to be boosted to have an intermediate pressure on the low stage side compression portion; and an intermediate partition plate which is provided between the both compression portions to insert the rotating shaft therethrough, wherein the two eccentric portions provided to the rotating shaft has a phase difference of 180°, a cross-sectional shape of a connecting portion for connecting the both eccentric portions is such that its thickness in a direction orthogonal to an eccentric direction is larger than the thickness in the eccentric direction.
Since the cross-sectional area of the connecting portion for connecting the two eccentric portions provided to the rotating shaft with a phase difference of 180° can be set large, the rigidity strength of the rotating shaft can be improved so that the rotating shaft can be prevented from being elastically deformed.
According to the present invention, the rotating shaft can be prevented from being elastically deformed even if a difference between a high pressure and a low pressure is large, and the two-cylinder type two-stage compression rotary compressor with the high durability and the excellent reliability can be obtained.


REFERENCES:
patent: 1929999 (1933-10-01), Wilson
patent: 53-103212 (1978-09-01), None

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