Venting passage for isolation block of scroll compressor and...

Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll

Reexamination Certificate

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Details

C418S270000

Reexamination Certificate

active

06390792

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a venting passage for isolation block of a scroll compressor, especially to a venting passage for isolation block of a scroll compressor to enhance venting flow and reduce noise and check valve for the same.
BACKGROUND OF THE INVENTION
FIG. 1
shows a prior art scroll compressor, which comprises an orbit scroll member
110
a
, a fixed scroll member
11
a
, and an isolation block
12
a
. The fixed scroll member
111
a
has a plurality of scroll wraps
110
a
and a discharging port
111
a
at a center thereof. The orbit scroll member
10
a
also has a plurality of scroll wraps
100
a
fitted with the scroll wraps
110
a
of the fixed scroll member
111
a
to form a plurality of compression chambers between the scroll wraps
100
a
of the orbit scroll member
10
a
and the scroll wraps
110
a
of the fixed scroll member
11
a
. The orbit scroll member
10
a
is driven by external force to orbit the fixed scroll member
11
a
without revolution, whereby working fluid is introduced into the compression chamber from outside. The working fluid is compressed to a high-pressure state in the compression chamber and discharged through the discharging port
111
a
. The isolation block
12
a
is fixed within a case
1
of the scroll compressor to divide the inner space of the case
1
into a high-pressure chamber
2
a
and a low pressure chamber
3
a
. The isolation block
12
a
has a through hole
122
a
to provide communication between the two chambers
2
a
and
3
a
. The scroll compressor has a plurality of back-pressure chambers
123
a.
Moreover, the fixed scroll member
11
a
is located within the low-pressure chamber
3
a
and the discharging port
111
a
has a tubular neck
112
a
extended therefrom. The tubular neck
112
a
is coupled to the through hole
122
a
of the isolation block
12
a
and a leak-proof member
124
a
is provided between the tubular neck
112
a
and the through hole
122
a
to prevent the working fluid from leaking into the low-pressure chamber
3
a
from the discharging port
111
a
. When the orbit scroll member
10
a
and the fixed scroll member
11
a
are engaged to each other, the compressed fluid therein is led to the back-pressure chambers
123
. Therefore, the compression chamber is tightened in axial direction to prevent the leakage of fluid therein. However, the discharging port
11
a
is generally configured with straight shape and the working fluid is discharged in axial direction. Alternatively, a radial venting hole
125
a
is provided at a flange
127
a
beside the through hole
122
a
. Moreover, a check valve
126
a
is provided in the through hole
122
a
. However, the flow of the working fluid may cause the imbalance of the check valve
126
a
and noise is generated. The radial venting hole
125
a
results a vertical fluid flowing path such that the fluid flow is not smooth and the noise is increased.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a venting passage for isolation block of a scroll compressor to enhance venting flow and reduce noise and check valve for the same.
To achieve the above object, the present invention provides a venting passage for isolation block of a scroll compressor to enhance venting flow and reduce noise, as well as a check valve for the same. The compressor mainly comprises a fixed scroll member, an orbit scroll member, and an isolation block. The fixed scroll member has a plurality of scroll wraps and a discharging port at a center thereof. The orbit scroll member also has a plurality of scroll wraps fitted with the scroll wraps of the fixed scroll member to form a plurality of compression chambers therebetween. The isolation block has a projecting ring with a venting passage at a center thereof. The venting passage has a through hole on a bottom thereof for communication with the discharging port. A baffle is provided at a top opening of the venting passage, whereby the venting passage forms a muffle room for the air entering therein. The muffle room has a floating planar valve. Moreover, the projecting ring has a plurality of venting apertures of window shape on a top portion thereof, preferably with even distribution. The plurality of venting apertures can be formed by milling machine or integrally formed with the isolation block.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing, in which:


REFERENCES:
patent: 5366359 (1994-11-01), Bookbinder et al.
patent: 5487654 (1996-01-01), Wallis et al.
patent: 5494422 (1996-02-01), Ukai et al.
patent: 03-267591 (1991-11-01), None
patent: 04-279782 (1992-10-01), None
patent: 05-149269 (1993-06-01), None
patent: 05-231351 (1993-09-01), None
patent: 06-026470 (1994-02-01), None
patent: 06-173864 (1994-06-01), None

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