Pumps – With muffler acting on pump fluid
Reexamination Certificate
2001-09-25
2003-05-27
Walberg, Teresa (Department: 3742)
Pumps
With muffler acting on pump fluid
C417S269000
Reexamination Certificate
active
06568921
ABSTRACT:
The present disclosure relates to the subject matter disclosed in international application No. PCT/EP01/00783 of Jan. 25, 2001, which is incorporated herein by reference in its entirety and for all purposes.
BACKGROUND OF THE INVENTION
The invention relates to a refrigerant compressor comprising a compressor housing, at least one cylinder chamber arranged in the compressor housing, a piston oscillatingly movable in the cylinder chamber, a suction chamber which is arranged upstream from the cylinder chamber and from which refrigerant enters the cylinder chamber, a pressure chamber which is arranged downstream from the cylinder chamber and into which refrigerant compressed in the cylinder chamber enters, a muffler channel which extends between a first end and a second end and via which compressed refrigerant flows from the pressure chamber into a outlet channel.
Such a refrigerant compressor is known, for example, from EP 0 926 343.
In this refrigerant compressor, refrigerant flows through the entire muffler channel in one direction, and a satisfactory attenuation is achieved, but there is a considerable space requirement owing to the length of the muffler channel through which the refrigerant flows.
The object underlying the invention is to further optimize such a refrigerant compressor with respect to the space requirement and the attenuation of pulsations.
SUMMARY OF THE INVENTION
This object is accomplished in a refrigerant compressor of the kind described at the outset, in accordance with the invention, in that the muffler channel comprises an inlet opening located between the first end and the second end.
The inventive solution makes it possible to further optimize the attenuation of pulsations in refrigerant compressors, namely by a pressure wave which enters the muffler channel propagating from the inlet opening in the direction of both the first and the second end and by the attenuation of pulsations then being even better due to reflections at both ends of the muffler channel.
Furthermore, optimum arrangement of such a muffler channel with respect to space is possible.
The outlet opening can, in principle, be arranged at very different places on the muffler channel. A particularly expedient solution makes provision for the outlet opening to be located in the area of one of the ends so that compressed refrigerant flows through the muffler channel insofar as it is conducted from the inlet opening to the outlet opening in the area of one of the ends.
In a particularly expedient solution to the realization of the muffler channel with respect to the provision of outlet openings, provision is made for the muffler channel to comprise two orifices in addition to the inlet opening, and for at least one of the orifices to form the outlet opening. This solution can be realized in a particularly simple way from a constructional point of view, in particular, also when the orifices are arranged in the area of opposite ends.
Many different possibilities of employing the inventive muffler channel are conceivable. One possibility is to so design the muffler channel that the compressed refrigerant flows into the muffler channel through the inlet opening and then in the direction of both ends to the respective outlet openings.
As an alternative or supplement to the above solution, a solution which is particularly expedient, in particular, with respect to its attenuating effect makes provision for the muffler channel extending between the ends to comprise a section through which the compressed refrigerant flows, and a section which is closed off in an acoustically blind manner, i.e., a section with reflection at the acoustically closed end. In particular, the section of the muffler channel closed off in an acoustically blind manner makes a considerable contribution towards the attenuation of pulsations or pressure waves because a reflection of a pressure wave occurs therein which then becomes superimposed with pressure waves subsequently entering the muffler channel through the inlet opening.
In particular, an acoustically blind section is designed such that an opening or a gap is created through which oil can flow off and so accumulations of oil are avoided.
Many different possibilities are conceivable for arranging the two sections relative to each other. For example, it is conceivable for the section of the muffler channel which is closed off in an acoustically blind manner to adjoin the outlet opening, so that a pressure wave entering the muffler channel first travels from the inlet opening to the outlet opening and then a portion thereof does not leave the muffler channel through the outlet opening but starting from the outlet opening propagates further in the section closed off in an acoustically blind manner.
A solution which is even more advantageous with respect to the attenuating effect makes provision for the section of the muffler channel through which the refrigerant flows and the section of the muffler channel which is closed off in an acoustically blind manner to extend away from the inlet opening, so that the pressure wave entering the muffler channel through the inlet opening is divided up into the section closed off in an acoustically blind manner and the section through which the refrigerant flows.
It is particularly expedient for the section through which the refrigerant flows and the section which is closed off in an acoustically blind manner to extend away from the inlet opening in opposite directions, so that, in particular, reflections in the section closed off in an acoustically blind manner can directly propagate further into the section through which the refrigerant flows.
So far no details have been given about the position of the inlet opening. In principle, it is conceivable to provide the inlet opening at optional places between the first end and the second end. A particularly expedient solution makes provision for the inlet opening to be located in the area of a central section of the muffler channel, preferably in the area of approximately half the entire length of the muffler channel, so that an incoming pressure wave separates into two sections which in their order of magnitude are of approximately equal length.
No details of the concrete embodiment of the muffler channel have been given in conjunction with the preceding embodiments. In an advantageous embodiment, provision is made for the muffler channel to be arranged in a part which is mountable on the compressor housing, and for the part to be mountable on the compressor housing in such a way that either the orifice arranged at the first end or the orifice arranged at the second end serves as outlet opening and leads into the outlet channel which is, for example, provided in the compressor housing.
As regards the respective other orifice, it is, for example, conceivable for it to lead into an additional section of the muffler channel extending, for example, in the compressor housing, and ending somewhere in an acoustically blind manner in the compressor housing. This would open up the possibility of additionally lengthening the muffler channel by a further section.
It is, however, particularly expedient from a constructional point of view for the respective orifice not opening into the outlet channel provided to be closed off in an acoustically blind manner.
Such an acoustically blind closure of the orifice could, for example, be brought about by a plug which is inserted or screwed in.
It is, however, particularly expedient for the orifice to be closed by an area of the part which carries the part mountable on the compressor housing.
In the simplest case, the part mountable on the compressor housing is the valve plate which is carried by a crankcase of the compressor housing and closes off the orifice with an area which covers it.
No details of the part which comprises the muffler channel and is mountable on the compressor housing have been given. This could be a separate part which is completely independent of the usual parts of the compressor housing and is inserted as a separate insert, for exam
Bitzer Kuehlmaschinenbau GmbH
Lipsitz Barry R.
McAllister Douglas M.
Patel Vinod D
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