Multistage swash plate compressor having two different sets of cylinders in the same housing

A multistage compressor for compressing a refrigerant for an automobile air conditioning system, comprising:

• a body having a front housing, and a rear housing connected to each other with a cylinder block clamped therebetween, the front housing and the cylinder block defining a swash plate chamber, the cylinder block having a longitudinal axis and including a plurality of sets of cylinder bores arranged parallel to, and around the longitudinal axis;
• pistons reciprocally received within the cylinder bores to define a plurality of sets of compression chambers together with the walls of cylinder bores;
• a drive shaft for driving the reciprocation of the pistons, the drive shaft being supported by the body for rotation, and drivingly connected to a rotational power source;
• a swash plate, mounted to the drive shaft to engage the pistons, for transforming the rotation of the drive shaft into the reciprocation of the pistons;
• the set of cylinder bores includes a first set of cylinder bores and second set of cylinder bores, the first set of cylinder bores having a diameter larger than the second set of cylinder bore so that a first set of compression chambers provides a low pressure stage and a second set of compression chambers provides a high pressure stage, the low and high pressure stages being fluidly connected to each other to provide a two stage compression process;
• and
• the first and second sets of cylinder bores being alternatively arranged around the longitudinal axis in each set of the compression chambers.