Pumps – With muffler acting on pump fluid
Patent
1997-09-19
2000-01-11
Freay, Charles G.
Pumps
With muffler acting on pump fluid
F04B 3900
Patent
active
060129085
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates generally to a relatively compact compressor such as utilized in a refrigerator for home use or a freezer and, more particularly, to a valve mechanism or a suction system of such a compressor.
BACKGROUND ART
In recent years, valve mechanism compressors have been improved in numerous ways to increase the efficiency of the compressors. However, demands have also been made from the market not only to increase the efficiency of the compressors, but also to suppress noise emission from the compressors.
The prior art compressor valve mechanism is disclosed in, for example, the Japanese Laid-open Patent Publication (unexamined) No. 3-175174.
Hereinafter, with reference to FIGS. 24, 25 and 26, the prior art compressor valve mechanism disclosed in the above mentioned Japanese Laid-open Patent Publication No. 3-175174 will be discussed.
FIG. 24 is a sectional view of the prior art valve mechanism in an assembled condition taken along the horizontal direction. FIG. 25 is a longitudinal sectional view of FIG. 24, and FIG. 26 is an exploded view of the prior art valve mechanism. In FIGS. 24 to 26, reference numeral 1 represents the valve mechanism, and reference numeral 4 represents a valve plate having two suction ports 2 and two discharge ports 3 both defined therein. A discharge reed valve 22 for selectively opening and closing the discharge ports 3 is retained within a recess 21 defined in the valve plate 4. Reference numeral 23 represents a stopper rivetted at 24 to the valve plate for regulating the lift of the reed valve 22. A suction reed valve 11, a plate-like gasket 12, the valve plate 4, a head gasket 13 and a cylinder head 14 are all bolted to a cylinder 10.
The cylinder 10 accommodates therein a piston drivingly coupled with an electric motor (not shown) for axial reciprocating movement within the cylinder 10. The cylinder head 14 has a suction chamber 25 and a discharge chamber 26 defined therein in cooperation with the valve plate 4.
The operation of the prior art compressor valve mechanism of the structure described above will now be described.
As a result of reciprocating movement of a piston 15, a refrigerant gas within the suction chamber 25 is sucked into the cylinder 10 through the suction ports 2 in the valve plate 4 during opening of the suction reed valve 11 and is subsequently compressed within the cylinder 10 before it is discharged into the discharge chamber 26 in the cylinder head 14 through the discharge ports 3 during opening of the discharge reed valve 22.
In the prior art valve mechanism discussed above, however, because the refrigerant gas is simultaneously discharged into the discharge chamber 26 through the two discharge ports 3, refrigerant gas flows interfere with each other to hinder smooth streams of the refrigerant gas, thus lowering the discharge efficiency and the performance of the compressor. Furthermore, because simultaneous discharge of the refrigerant gas from the two discharge ports 3 into the discharge chamber 26 is intermittently performed, very large pressure pulsations and noises are undesirably generated.
Also, the discharge reed valve merely has only one resonant mode as streams of the refrigerant gas discharged respectively from the two discharge ports 3 push the discharge reed valve 22 simultaneously. Therefore, it has been difficult to make resonance of the reed valve 22 proper and also to optimize the discharge efficiency at about 3,000 revolutions per minute at 50 Hz and also at about 3,600 revolutions per minute at 60 Hz. Also, even in the case of the compressor in which the number of revolutions per minute is varied such as an inverter, there has been a problem in that changes in number of revolutions per minute tend to be accompanied by considerable lowering of the efficiency.
In addition, since the discharge reed valve 22 merely has the single resonant mode, there has been another problem in that hissing sounds generated by the respective streams of the refrigerant gas discharged from the two discharge ports
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Kita Ichiro
Tanaka Yasuhiko
Umeoka Ikutomo
Evora Robert Z.
Freay Charles G.
Matsushita Refrigeration Company
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