Suction gas conduit for a refrigeration compressor

Details Suction gas conduit for a refrigeration compressor Suction gas conduit for a refrigeration compressor

2000-05-09

2001-08-28

Freay, Charles G. (Department: 3746)

Pumps

With muffler acting on pump fluid

C417S572000, C138S037000

Reexamination Certificate

active

06280153

ABSTRACT:

The invention relates to a suction gas conduit for a refrigeration compressor, having a curved section which connects an inlet section of the gas path to an outlet section, there being provided a widening in the form of a step on the inner side of the curve of the gas path, the curved section especially abutting, at the outlet end, a valve plate of the compressor, which valve plate has a suction gas opening.
In a known construction of that kind (U.S. Pat. No. 5,577,898), an extension connected to a suction sound damper is held between a cylinder head cover and a valve plate. The end of the extension is in the form of a curved section which is bounded, on the outer side of the curve of the gas path, by two wall portions arranged at an angle to one another, through which there passes a capillary tube duct extending into the gas path. A step provided on the inner side of the curve is formed as a result of the fact that the outlet opening of the curved section has a larger cross-section than the suction gas opening in the valve plate. The purpose of that recess is not mentioned.
The problem underlying the invention is to reduce the flow resistance in the suction gas channel.
The problem is solved according to the invention by means of the fact that the outer side of the curve of the gas path is unimpeded and the step height is from 0.3 to 1.0 times, and the step length from 0.2 to 1.0 times, the hydraulic diameter of the outlet section.
As will be explained in greater detail hereinafter, the step, when it is correctly dimensioned, bounds a recirculation space, wherein the recirculation—which is unavoidable when there are marked changes in flow direction—takes place outside the outlet section so that the effective cross-section of the latter is not impeded or is impeded less markedly. That is achieved, however, only when no wall portions impeding the flow are present on the outer side of the curve.
Because almost the entire cross-section of the outlet section is available for the main flow, the refrigeration gas can flow in at a relatively low speed during the suction stroke. That reduces the noise produced and lowers the flow resistance, resulting in a relatively high degree of filling for the compressor.
Advantageously, the step height is from 0.3 to 0.8 times, and the step length from 0.4 to 0.8 times, the hydraulic diameter of the outlet section. The optimum can be determined by means of a few tests.
It is recommended that the curved section be smooth and approximately uniformly curved, as a result of which the diversion losses on the outer side of the curve are kept small.
In a preferred arrangement, it is arranged that the curved section abuts, at the outlet end, the end face of the valve plate and, for formation of the step, has an outlet opening larger than the suction gas opening. The step is accordingly obtained on the curved section by simple means.
Another, likewise preferred alternative consists in the fact that the valve plate has, for formation of the step, a recess larger than the suction gas opening, and the outlet opening of the curved section is matched to the size of the recess. In this instance, the step is formed with the aid of the valve plate, which is especially advantageous when there is a relatively thick valve plate.
The curved section can again abut the end face of the valve plate or is, especially advantageously, located in the recess by means of projecting wall portions.
In a modification based on the same principle it is arranged, according to the invention, that the widening is formed by an opening on the inner side of the curve, which opening opens into a suction sound damper chamber and has dimensions that correspond to the height and length of an imaginary step. Because the gas in the suction sound damper chamber is at approximately the same pressure as in the gas path, it is largely capable of replacing the claimed steps.


REFERENCES:
patent: 5230369 (1993-07-01), Presz, Jr.
patent: 5577898 (1996-11-01), Lee
patent: 5613842 (1997-03-01), Alfano et al.
patent: 5762478 (1998-06-01), Lee

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