outlet chamber 5 flows in direction of the longitudinal axis of the outlet channel 6 fig2 illustrates a refrigerant compressor 1 according to an embodiment of the invention provided with a muffler 8 disposed in a suction side of the compressor 1 the basic structure of the refrigerant compressor 1 is similar to the refrigerant compressor illustrated in fig1 the muffler 8 includes a partition wall 7 having a plurality of apertures 9 formed therein the partition wall 7 is an integral component of an inlet channel 3 and thus also of a casing 2 an inlet chamber 4 extends from a first distal end passing through an annular outlet chamber 5 to a second distal end which ends within the inlet chamber 4 in the region of the second distal end which ends within the inlet chamber 4 the apertures 9 of the partition wall 7 are adapted for the flow of a refrigerant therethrough in the embodiment shown the partition wall 7 includes seven apertures 9 disposed in two rows the second distal end of the inlet channel 3 the distal end ending within the inlet chamber 4 has a face side which is substantially closed tight to mediums all apertures 9 are substantially equidistant from each other for hydrodynamic reasons such that neighboring apertures 9 of a row and neighboring apertures 9 of column are substantially equidistant from each other a direction of flow of the refrigerant follows from the position of the apertures 9 which extend substantially orthogonal to a longitudinal axis of the inlet channel 3 and substantially.