Pumps – With muffler acting on pump fluid
Patent
1998-05-21
2000-11-28
Argenbright, Tony M.
Pumps
With muffler acting on pump fluid
181229, 181403, F04B 3900
Patent
active
061527033
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a hermetic-type compressor for use in refrigeration apparatuses and the like.
BACKGROUND OF THE INVENTION
Hermetic-type compressors for use in refrigeration apparatuses and the like are strongly requested to have improved refrigeration capability and to reduce noise.
As conventional technologies for improving refrigeration capability, the hermetic-type compressors have been disclosed in Japanese Laid-open Patent Application No. Sho 57-122192 and No. Hei 6-50262, for example. In these conventional technologies, pressure in a cylinder at the time when the suction of refrigerant gas is completed is raised higher than the pressure on the low-pressure side of a refrigeration cycle, whereby the density of refrigerant gas to be sucked into the cylinder is raised so as to further improve refrigeration capability.
In addition, as a conventional technology for reducing noise, a hermetic-type compressor has been disclosed in Japanese Laid-open Patent Application No. Hei 6-74154, for example. In this hermetic-type compressor, its suction portion for sucking refrigerant gas into its cylinder has been improved in order to prevent the generation of resonance sound which generates in its enclosed container during suction in a compression stroke.
An example of conventional hermetic-type compressors intended to reduce noise is described below referring to the drawings.
FIG. 67 is a vertical sectional view showing a conventional hermetic-type compressor, and FIG. 68 is a plan sectional view showing the conventional hermetic-type compressor shown in FIG. 67.
In FIGS. 67 and 68, a hermetic-type compressor 1 has an enclosed container 2 comprising a lower shell 3 and an upper shell 4. An electric compression element 5 disposed vertically in the enclosed container 2 is elastically supported in the enclosed container 2 by coil springs 8 so that a mechanical portion 6 is disposed in the upper portion and so that a motor portion 7 is disposed in the lower portion.
The mechanical portion 6 comprises a cylinder 10 integrally provided with a block 9, a piston 11, a crankshaft 12, a connecting rod 13, a bearing 14, a cylinder head 80 and the like. The motor portion 7 comprises a rotor 15 secured by shrinkage fit to the crankshaft 12 and a stator 16. The stator 16 is secured to the block 9 using screws. Lubricant 17 is stored at the bottom of the enclosed container 2.
Mark a in FIG. 68 represents the minimum distance between the inner walls of the enclosed container 2 along the center of gravity of a plane having nearly the maximum cross-sectional area on a horizontal section of the enclosed container 2. In other words, the distance a is the maximum distance in a direction perpendicular to the reciprocating direction of the piston 11 and the axial direction of the crankshaft 12. Mark b represents the distance between the inner walls of the enclosed container 2 in a direction nearly perpendicular to the line segment of the above-mentioned distance a on the same horizontal plane. That is, the distance b is the maximum distance between the inner walls of the enclosed container 2 in the reciprocating direction of the piston 11. Mark c represents the maximum distance from the upper inner wall surface of the enclosed container 2 to the surface of the lubricant 17 in the axial direction of the crankshaft 12.
In a suction pipe 18 for sucking refrigerant gas in the enclosed container 2, its one end is secured to the block 9, and the other end passes through the center of the line indicated by the distance a and is disposed on a plane orthogonal to the line. This other end is disposed in the space inside the enclosed container 2 as an opening end 18a, and communicates with the space inside the cylinder 10.
The operation of the conventional hermetic-type compressor having the above-mentioned configuration is described below.
Refrigerant gas circulated from a system such as a refrigeration apparatus is relieved once in the space inside the enclosed container 2, sucked into the cylinder 10 via the
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patent: 4856286 (1989-08-01), Sulfstede et al.
patent: 5288212 (1994-02-01), Lee
patent: 5358386 (1994-10-01), Koyama et al.
patent: 5496156 (1996-03-01), Harper et al.
Akashi Hironari
Hayashi Akira
Yagi Akio
Yoshimura Takao
Argenbright Tony M.
Matsushita Refrigeration Company
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