Cylinder head for piston refrigeration compressor, compression unit including such cylinder head, and piston refrigeration compressor including said compression unit

Abstract

The invention relates to a cylinder head for a piston refrigeration compressor that comprises at least a first part defining a cooling-gas suction chamber and at least a second part defining a cooling-gas discharge chamber, the first and second parts being distinct from each other, and the suction and discharge chambers each being intended to be brought into communication with a compression chamber provided in the compressor. The cylinder head includes thermal insulation means provided between the first and second parts. One of first and second parts includes a tubular section and another one includes a passage. The tubular section is configured to insert into the passage so as to define the thermal insulation means arranged between the outer wall of the tubular section and the inner wall of the passage. The cylinder head has simple structure and is able to prevent the gas to be compressed from being heated by the compressed cooling gas.

Description

technical field [0001] The invention relates to a cylinder head for a piston type refrigeration compressor, a compression unit comprising the cylinder head, and a piston type refrigeration compressor comprising the compression unit. Background technique [0002] The cylinder head for the piston refrigeration unit includes a cooling gas suction chamber and a cooling gas discharge chamber, both of which are designed to communicate with the compression chamber provided in the compressor. [0003] A disadvantage of this cylinder head is that the cooling gas to be compressed drawn into the suction chamber is heated by the compressed cooling gas discharged into the discharge chamber. [0004] The heating of the cooling gas to be compressed causes its temperature to increase and its enthalpy to increase, while its density decreases. The reduction in the density of the cooling gas to be compressed results in a reduction in the mass of the gas compressed by the compressor and, for t...

AI Technical Summary

Problems solved by technology

[0005] Another disadvantage of piston compressors, especially those that have to work at high discharge pressures, is that they have to realize a rigid cylinder head, so that the cylinder head is imposed on its connection with the valve plate and between the valve plate and the cylinder block. The pressure at the connection between the

In order to achieve a rigid cylinder head in high pressure applications, it is necessary to make the parts have considerable inertia and therefore appear bulky

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