Refrigerant compressor

Abstract

Hermetically encapsulated refrigerant compressor (1), comprising a cylinder housing (3), which is used as the basis for manufacturing various refrigerant compressor construction series each having different working volumes and a piston (6) guided in a piston bore (8) of the cylinder housing (3) along a defined piston run surface (9). According to the invention, it is provided that a free run section (10) is situated in the piston bore (8) as a function of the particular working volume to be implemented inside the cylinder housing (3), which working volume is fixable by a variation of the position of the piston (6) or the piston run surface (9) in the piston bore (8), so that the piston run surface (9) is reduced to a minimal guide length measured in the direction of the cylinder axis (12), at which the piston (6) is only lowered in its bottom dead center position far enough into the area of the piston bore (8) corresponding to the piston run surface (9) so that the piston (6) is just prevented from falling out of the piston bore (8) and a sealing action of the piston (6) in relation to the piston run surface (9) is provided.

Description

AREA OF THE INVENTION[0001]The invention relates to a hermetically encapsulated refrigerant compressor, comprising a cylinder housing as the basis for manufacturing various models of a refrigerant compressor family and a piston, which is guided in a piston bore of the cylinder housing along a defined piston run surface, for compressing a working medium, which piston is linked using a connecting rod to a crankshaft, which is driven by an electric motor, the crankshaft, which is rotatable around a rotational axis, being mounted in a mounting body which is preferably implemented integrally with the cylinder housing, the piston bore being closed in a first end area by a cylinder head comprising a valve plate, while the piston bore is open in a second end area facing toward the crankshaft to receive the piston, and the piston bore has a free run section, which adjoins the piston run surface and is situated in the second end area of the piston bore facing toward the crankshaft, whose clea...

AI Technical Summary

Benefits of technology

[0016]It is provided according to the invention that the free run section is situated as a function of a particular working volume, which is delimited by the valve plate and the front side of the piston, and which is fixable by a variation of the position of the piston or the piston run surface in the piston bore, to be implemented inside the cylinder housing in such a way that the piston run surface is reduced in each case to a minimal guide length, at which the piston is only lowered far enough in its bottom dead center position into the area of the piston bore corresponding to the piston run surface that the piston is just prevented from falling out of the piston bore and a sealing action of the piston in relation to the piston run surface is provided.

[0029]By installing the piston bolt in a piston located above its bottom dead center position, greater design freedom is made possible for the dimensioning of individual components of the piston-cylinder configuration. In particular, connecting rods and pistons of various lengths and differently dimensioned crankshafts may be used, friction optimization of the piston run surface always being able to be performed by the above-described provision according to the invention of a free run section.

Problems solved by technology

In the case of special pre-installations of the cylinder head and the valve plate on the cylinder housing, in particular in the case of a screwless cylinder head fastening device known from EP 1888918 A1, however, described machining or shortening of the cylinder housing on the cylinder head side does not come into consideration or would be viewed as uneconomical, since the cylinder housing is provided with precisely manufactured fixing grooves in this area, in which corresponding fixing elements engage in a locking manner.

However, manufacturing of pistons having diameters of different sizes, which is required in this case, is complex and uneconomical.

The precisely fitted final machining of the bored-out piston bore in the area of the piston run surface also requires a high manufacturing effort.

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