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Fluid machine

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Fluid machine


A fluid machine includes a lubrication mechanism (70, 72) configured to utilize a rotary shaft (14) to supply lubricating oil stored in an inside bottom (2a) of a hermetic container (2) to an upper region in the hermetic container, a frame (36) secured to the hermetic container and disposed in contact with an upper surface (16a) of a cylinder block (16) to support a driven unit (6), the frame having an upper surface (38a) onto which the lubricating oil supplied to the upper region in the hermetic container flows down, a connecting rod (20) arranged under the frame and coupling the rotary shaft to a piston (18), a piston pin (66) coupling the connecting rod to the piston, a first oil feed hole (78) formed through the frame and the cylinder block, and a second oil feed hole (80) formed through the frame.
Related Terms: Fluid Machine

Inventor: Teruo Higuchi
USPTO Applicaton #: #20120301330 - Class: 417313 (USPTO) - 11/29/12 - Class 417 
Pumps > Combined

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The Patent Description & Claims data below is from USPTO Patent Application 20120301330, Fluid machine.

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TECHNICAL FIELD

The present invention relates to fluid machines, and more particularly, to a fluid machine suitable for use as a hermetic type reciprocating compressor for compressing a carbon dioxide refrigerant.

BACKGROUND ART

As a fluid machine of this type, a hermetic type compressor has been known which is provided with a hermetic container storing lubricating oil in an inside bottom thereof, an electric motor arranged inside the hermetic container, a compression mechanism arranged inside the hermetic container and including a piston driven by the electric motor through a rotary shaft and a cylinder block having a cylinder bore formed therein, the piston being reciprocated within the cylinder bore to draw in and discharge a working fluid, and a lubrication mechanism configured to utilize centrifugal force produced by rotation of the rotary shaft, to supply the lubricating oil stored in the inside bottom of the hermetic container to an upper region in the hermetic container.

Patent Document 1 discloses a hermetic type compressor in which an oil feed hole is formed in the cylinder block to connect the cylinder bore to the outside of the cylinder bore, and an annular groove is formed in the outer peripheral surface of the piston. When the piston is at its bottom dead center, the oil feed hole communicates with the annular groove, and when the piston is at it top dead center, the oil feed hole communicates with the cylinder bore.

PRIOR ART LITERATURE Patent Document

Patent Document 1: Japanese Laid-open Patent Publication No. 2009-197684

SUMMARY

OF THE INVENTION Problems to be Solved by the Invention

The above conventional technique permits the lubricating oil to be effectively supplied to the piston or cylinder bore and also enables lubrication of the gap between the piston and the cylinder block. No special consideration is, however, given to localized lubrication of a connecting rod coupling the rotary shaft to the piston and of a piston pin coupling the connecting rod to the piston. Thus, there still is a demand for improvement in the lubrication performance and reliability of fluid machines.

The present invention was created in view of the above circumstances, and an object thereof is to provide a fluid machine improved in lubrication performance and reliability.

Means for Solving the Problems

To achieve the object, the present invention provides a fluid machine comprising: a hermetic container storing lubricating oil in an inside bottom thereof; a driving unit arranged inside the hermetic container; a driven unit arranged inside the hermetic container and including a piston driven by the driving unit through a rotary shaft and a cylinder block having a cylinder bore formed therein, the piston being reciprocated within the cylinder bore to draw in and discharge a working fluid; a lubrication mechanism configured to utilize the rotary shaft to supply the lubricating oil stored in the inside bottom to an upper region in the hermetic container; a frame secured to the hermetic container and disposed in contact with an upper surface of the cylinder block to support the driven unit, the frame having an upper surface onto which the lubricating oil supplied to the upper region in the hermetic container flows down; a connecting rod arranged under the frame and coupling the rotary shaft to the piston; a piston pin coupling the connecting rod to the piston; a first oil feed hole formed through the frame and the cylinder block; and a second oil feed hole formed through the frame (claim 1).

When the piston is at a bottom dead center thereof, the first oil feed hole is located immediately above the piston pin and the second oil feed hole is located immediately above the connecting rod (claim 2).

When the piston is at a top dead center thereof, the first and second oil feed holes are located immediately above the connecting rod (claim 3).

The frame has oil reservoir sections formed by spot-facing respective openings of the first and second oil feed holes (claim 4).

The connecting rod has an oil groove formed in an upper surface thereof and extending from a location near the rotary shaft to a vicinity of the piston pin (claim 5).

Pressure of the working fluid drawn into and discharged from the driven unit prevails in an interior of the hermetic container, and the working fluid is a carbon dioxide refrigerant (claim 6). Advantageous Effects of the Invention

The fluid machine according to claim 1 is provided with the first and second oil feed holes, and the first and second oil feed holes allow the lubricating oil to reliably drop onto the piston, the piston pin and the connecting rod, which are arranged under the frame. This is because the frame is secured to the hermetic container and the lubricating oil that flows from the upper region in the hermetic container down to the upper surface of the frame is not acted upon by the centrifugal force produced by the rotation of the rotary shaft. Accordingly, the lubricating oil can effectively lubricate the driven unit without being influenced by the centrifugal force, whereby the lubrication performance and reliability of the fluid machine can be improved.

According to the invention of claim 2, when the piston is at the bottom dead center, the first oil feed hole is located immediately above the piston pin, and the second oil feed hole is located immediately above the connecting rod. Accordingly, when the piston is at the bottom dead center and thus the pressure of the working fluid in the cylinder bore is low, the lubricating oil can be made to drop from the first and second oil feed holes directly onto the piston pin and the connecting rod, respectively, without being influenced by the pressure of the working fluid slightly leaking from the cylinder bore. The driven unit can therefore be lubricated more effectively, making it possible to further improve the lubrication performance of the fluid machine.

According to the invention of claim 3, when the piston is at the top dead center, the first and second oil feed holes are located right above the connecting rod.

Thus, also when the piston is at the top dead center and thus the working fluid pressure in the cylinder bore is high, the lubricating oil can be made to drop from the first and second oil feed holes directly at least onto the connecting rod. The driven unit can therefore be lubricated more effectively, making it possible to further improve the lubrication performance of the fluid machine.

According to the invention of claim 4, the frame has the oil reservoir sections for temporarily storing the lubricating oil that flows from the upper region in the hermetic container down to the upper surface of the frame. It is therefore possible to cause the lubricating oil to intermittently drip little by little, and since the driven unit can be lubricated more effectively, the lubrication performance of the fluid machine can be further improved.

According to the invention of claim 5, the connecting rod has the oil groove formed in the upper surface thereof, and the oil groove permits the lubricating oil dropped from the first and second oil feed holes onto the connecting rod to be guided to those portions at which the connecting rod is coupled to the rotary shaft and the piston pin. Thus, since the driven unit can be lubricated more effectively, the lubrication performance of the fluid machine can be further improved.

According to the invention of claim 6, the working fluid is a carbon dioxide refrigerant. Where a carbon dioxide refrigerant is used as the working fluid, the pressure of the working fluid discharged from the cylinder bore is high, so that the pressure of the working fluid leaking from the cylinder bore and prevailing in the interior of the hermetic container may possibly become high. Consequently, the lubricating oil dropping, in particular, from the first oil feed hole directly onto the piston pin is greatly influenced by the pressure of the working fluid. With the aforementioned configuration, however, the driven unit can be effectively lubricated without the influence of the pressure of the working fluid, whereby the lubrication performance of the fluid machine can advantageously be enhanced.



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stats Patent Info
Application #
US 20120301330 A1
Publish Date
11/29/2012
Document #
13576152
File Date
01/27/2011
USPTO Class
417313
Other USPTO Classes
International Class
04B53/18
Drawings
6


Fluid Machine


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