Pumps – With muffler acting on pump fluid
Patent
1997-12-23
2000-01-25
Freay, Charles G.
Pumps
With muffler acting on pump fluid
181249, F04B 5300
Patent
active
060171979
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a suction sound damper for a refrigerant compressor, having an inlet, which is arranged to be connected to a suction port, and an outlet, which is arranged to be connected to the refrigerant compressor, and also having at least one damping volume.
Such a suction sound damper is known from U.S. Pat. No. 5,201,640. In this suction sound damper, the inlet is connected to the outlet by way of a tube. The tube forces a number of direction changes on the gaseous refrigerant flowing through it. The tube has a number of radial openings through which the inside of the tube is in connection with the damping volume which surrounds the tube. The known solution is firstly relatively expensive, because the tube is constructed as a separate component which accordingly requires a further manufacturing step and additional material. Moreover, the many directional changes in the flow of refrigerant lead to an increased flow resistance, with the result that the efficiency of a compressor which is provided with such a suction sound damper may suffer.
Another suction sound damper is known from DE 36 45 083 C2. This suction sound damper consists of two halves that are joined together and then enclose four chambers which are connected to one another partly by throttling points and partly by a throttling channel. These throttling points and channels also lead to a relatively large flow resistance, with adverse consequences for the efficiency of a compressor equipped therewith. Such a suction sound damper can, however, be manufactured relatively inexpensively.
SUMMARY OF THE INVENTION
The invention is based on the problem of providing a simple and inexpensive suction sound damper for a refrigerant compressor, which allows improved efficiency of the refrigerant compressor.
That problem is solved in a suction sound damper of the kind mentioned in the introduction in that it is formed from a first and a second half which define an internal space in which the damping volume is arranged, the first half having projecting into the internal space a gas deflection wall which, at least over sections thereof, forms a lateral limitation of a flow path free from throttle points between inlet and outlet.
With such a construction the flow resistance of the suction sound damper can be reduced quite considerably. The efficiency of the compressor which is provided with such a suction sound damper can therefore be increased. Surprisingly, there is a satisfactory sound damping even without relatively large throttling resistances. On the contrary, it is now possible for the refrigerant flowing through the flow path to expand into the damping volume arranged likewise in the internal space. The function of the gas deflection wall is substantially merely to guide the gaseous refrigerant, which flows through the suction sound damper, at least over sections thereof from the inlet to the outlet. The gas deflection wall itself no longer forms any throttling points. Because the flow losses are kept small, the refrigerant can flow through the suction sound damper at a uniform speed, but with a lower pressure drop. Because the suction sound damper is arranged, in the case of encapsulated domestic refrigeration machines, generally within the capsule, that is, within an atmosphere of refrigerant that has already been heated, the flow speed that can be achieved has the advantage that the refrigerant that is still cold in the suction sound damper does not become appreciably warm. Any such warming leads to loss of density and thus to impairment of the efficiency of the refrigerant compressor.
The inlet preferably opens substantially parallel to the gas deflection wall into the internal space. The gas deflection wall is thus located approximately tangentially to the incoming refrigerant. Eddying of the refrigerant, which could lead to an increase in the flow resistance and to slowing of the refrigerant, are therefore largely avoided.
It is also preferred for the outlet to run substantially parallel to the gas de
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patent: 5201640 (1993-04-01), Heinzelmann et al.
Iversen Frank Holm
Jensen Michael Skovgaard
Danfoss Compressors GmbH
Evora Robert Z.
Freay Charles G.
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