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Reciprocating compressor

a compressor and reciprocating technology, applied in the direction of positive displacement liquid engines, pump components, piston pumps, etc., can solve the problems of excessive compression of working fluid, affecting the flow of working fluid b>103/b>, and reducing the capacity of the compression chamber

Inactive Publication Date: 2012-01-19
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a reciprocating compressor with an induction means on the piston top end surface, which guides working fluid from the outer edge of the top end surface towards the opposite position of the top end surface facing the discharge hole. This reduces the capacity of the compression chamber as the piston moves, compressing the working fluid and discharging it from the discharge hole. The induction means prevents the working fluid from remaining near the inner peripheral surface of the compression chamber, which results in improved efficiency of the compressor.

Problems solved by technology

That is, increase in a capacity of very small capacity 127 means a deterioration of compression rate of working fluid 103, and this lowers the volumetric efficiency.
However, if a capacity of very small capacity 127 is excessively reduced to enhance the volumetric efficiency, a passing-sectional area through which working fluid 103 flows to discharge hole 119 becomes narrow, and there is a possibility that flow of working fluid 103 is hindered and the working fluid is excessively compressed.
As a result, there is a possibility that input of the compressor is increased and the compressor efficiency is deteriorated.

Method used

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Examples

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first embodiment

[0057]FIG. 1 is a vertical sectional view of a reciprocating compressor according to a first embodiment of the present invention. FIG. 2 is an exploded perspective view of a compressing element of the reciprocating compressor according to the first embodiment. FIG. 3 is a perspective view of a piston constituting the compressing element of the reciprocating compressor according to the first embodiment. FIG. 4 is a plan view of the piston of the reciprocating compressor according to the first embodiment. FIG. 5 is a vertical sectional view of the piston of the reciprocating compressor according to the first embodiment taken along the line 5-5 in FIG. 3.

[0058]In FIGS. 1 to 5, the reciprocating compressor has airtight container 1 in a bottom of which oil 2 is stored, and working fluid 3 such as a hydrocarbon-based refrigerant having a low global warming potential, e.g. R600a is charged.

[0059]Airtight container 1 includes suction pipe 50 and discharge pipe 57 formed by a drawing press d...

second embodiment

[0103]FIG. 9 is a perspective view of a piston of a reciprocating compressor according to a second embodiment of the invention. FIG. 10 is a plan view of the piston of the reciprocating compressor according to the second embodiment of the invention. FIG. 11 is a sectional view of the reciprocating compressor according to the second embodiment of the invention taken along the 11-11 line in FIG. 9. FIG. 12 are schematic diagrams for diagram for explaining a flow of working fluid in a compression stroke of the reciprocating compressor according to the second embodiment of the invention, wherein FIG. 12A shows a state immediately before a compressing operation is started (immediately before a sucking operation is completed, near the bottom dead center), FIG. 12B shows midst of the compression stroke, and FIG. 12C shows the discharge stroke. The same or corresponding constituent elements as those in the first embodiment are designated with the same symbols and the second embodiment is de...

third embodiment

[0124]FIG. 13 is a perspective view of a piston of a reciprocating compressor according to a third embodiment of the invention. FIG. 14 is a plan view of the piston of the reciprocating compressor according to the third embodiment of the invention. FIG. 15 is a sectional view of the reciprocating compressor according to the third embodiment of the invention taken along the 15-15 line in FIG. 13. The same or corresponding constituent elements as those of the first embodiment are designated with the same symbols and the third embodiment is described.

[0125]As shown in FIGS. 13, 14 and 15, piston 16 of the reciprocating compressor according to the third embodiment of the invention is different from the configuration of piston 16 of the second embodiment in that a plurality of recesses 25a, 25b and 25c are disposed on top end surface 24 of piston 16 in a fan-shape extending around an opposite position of top end surface 24 facing discharge hole 19. Like the first embodiment, projection 2...

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Abstract

According to the present invention, a recess (25) which is induction means is provided in a top end surface (24) of a piston (16), the recess (25) guides working fluid (3) staying near an inner peripheral surface of a compression chamber (13) from an outer peripheral edge of the top end surface (24) toward an opposite position of the top end surface (24) facing a discharge hole (19), and the recess (25) smoothens discharging motion of working fluid (3) from the discharge hole (19).

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a reciprocating compressor used for an air compressor and a refrigeration cycle apparatus such as a refrigerator.[0003]2. Description of the Related Art[0004]In recent years, to protect global environment, demands for energy saving of various devices are increasingly strengthened, and it is strongly desired to enhance efficiencies of a compressor used for a refrigerator or other refrigeration cycle apparatus, and a reciprocating compressor such as an air compressor used in an industrial field.[0005]As a conventional reciprocating compressor of this kind, there is known a compressor in which a recess is formed in an upper surface of a piston movable in reciprocating motion in a cylinder to enhance the efficiency of the compressor as disclosed in Examined Japanese Patent Application, Publication No. H08-6689.[0006]FIG. 19 is a sectional view of the conventional reciprocating compressor des...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04B35/04
CPCF04B53/14F04B39/1066
Inventor HIKICHI, TAKUMIKINJO, KENJI
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD