Rotary compressor having a cylinder block of sintered metal

Details Rotary compressor having a cylinder block of sintered metal Rotary compressor having a cylinder block of sintered metal

2000-11-03

2002-09-10

Vrablik, John J. (Department: 3748)

Rotary expansible chamber devices

Working member has planetary or planetating movement

Plural working members or chambers

C418S063000, C418S179000, C418S029000, C418S087000

Reexamination Certificate

active

06447274

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a rotary compressor, particularly the structure of its cylinder block.
BACKGROUND OF THE INVENTION
FIG. 11
is a conventional rotary compressor. A rotary-type compression mechanism
102
is housed in a hermetically sealed housing
101
. The rotary-type compression mechanism
102
comprises cylinder block
103
a
,
103
b
, piston
104
a
,
104
b
, vane, rotary shaft
105
, main bearing
107
, and sub-bearing
108
. The piston
104
a
,
104
b
eccentrically rotates in the cylinder. The vane moves reciprocally with its end being in contact with the end of piston
104
a
,
104
b
, dividing the cylinder into a high-pressure chamber and a low pressure chamber. The rotary shaft
105
drives the piston
104
a
,
104
b
. The main bearing
107
and sub-bearing
108
hold the axial end of cylinder block
103
a
,
103
b
therebetween, rotatably supporting the rotary shaft
105
, and the main bearing
107
is positioned at motor
106
side and, the sub-bearing
108
, at the opposite side of the motor. In the example of this conventional type, there are provided upper and lower compression elements, and the two compression elements are arranged with an intermediate plate
109
therebetween. The cylinder block
103
a
,
103
b
is made of cast iron. The compression mechanism
102
is secured to the hermetically sealed housing with the cylinder block
103
a
spot-welded thereto.
However, in such conventional rotary compressor, many processes such as making a number of holes and taps by machining cast iron and surface finishing are necessary to make cylinder blocks, resulting in higher costs. Particularly, in a two-cylinder rotary compressor, it is necessary to make two-cylinders, and in addition, the upper and lower cylinders are different in shape, adding to the cost of making cylinder blocks.
The present invention is intended to provide a compressor which is inexpensive and less in machining processes.
SUMMARY OF THE INVENTION
A rotary compressor of the present invention comprises a compression mechanism, a motor, and a hermetically sealed housing. The compression mechanism includes compression elements, a rotary shaft and bearing. The compression elements include a cylinder block, piston and vane. The cylinder block includes a cylinder hole and vane groove. The bearing closes the end of the cylinder hole and bears the rotary shaft. The compression mechanism and the motor are housed in the hermetically sealed housing. The cylinder block is made up of sintered metal. The compression mechanism is welded to the hermetically sealed housing within the region other than the cylinder block.
The method for manufacturing a rotary compressor of the present invention comprises the steps of:
(a) forming a sinter-molded blank for cylinder blocks by using sintered metal, and
(b) securing a compression mechanism to a hermetically sealed housing by welding the compression mechanism to the hermetically sealed housing in a region other than the cylinder block.
Preferably, the sintered metal is sintered iron.
Preferably, the cylinder block includes a first cylinder block and a second cylinder block, and the first cylinder block and the second cylinder block are formed by machining sinter-molded blanks identical in shape.
By this configuration, it is possible to reduce the machining processes and to make the blank parts usable in common, realizing the manufacture of a low-cost compressor. Further, the two cylinder blocks, the first cylinder block and the second cylinder block, may be die-formed by sinter molding, and it is possible to make the sinter-molded blanks identical in shape. Accordingly, it is possible to reduce the machining processes and to make the blank parts usable in common, thereby realizing the manufacture of a low-cost compressor.


REFERENCES:
patent: 5102317 (1992-04-01), Okoma et al.
patent: 6290472 (2001-09-01), Gannaway
patent: 60-135687 (1985-07-01), None
patent: 4-159486 (1992-06-01), None
patent: 6-147168 (1994-05-01), None

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