Refrigerant Compressor Unit

Abstract

In order to make a refrigerant compressor unit as light and compact as possible so that it can be used as a transcritical CO2 compressor, it is proposed that the cylinder head is manufactured from a cast material comprising iron and that the housing sleeve, the compressor housing portion and a cylinder housing block, which accommodates the cylinders, as well as the motor housing portion form a single-piece part, in particular made of lightweight material.

1 . A refrigerant compressor unit, comprising a housing with a housing sleeve closed at the end, the housing sleeve comprising a compressor housing portion in which there are arranged at least two cylinders, each with a piston arranged therein, and a drive chamber with drive units arranged therein and driven by a drive shaft, wherein the housing sleeve comprises a motor compartment with an electric motor arranged therein and driving the drive shaft, wherein a valve plate covering the cylinders is arranged on the housing sleeve and carries a cylinder head on its side opposite the cylinders, in which cylinder head at least one inlet chamber and at least one outlet chamber are arranged,
 wherein the cylinder head is manufactured from a cast material comprising iron, and wherein the housing sleeve, together with the compressor housing portion and a cylinder housing block, which accommodates the cylinders, and the motor housing portion form a single-piece part, in particular made of lightweight material.   
     
     
         2 . The refrigerant compressor unit in accordance with  claim 1 , wherein the cylinder head is manufactured from a cast material comprising an iron-carbon alloy. 
     
     
         3 . The refrigerant compressor unit in accordance with  claim 1 , wherein the cylinder head is manufactured from cast steel. 
     
     
         4 . The refrigerant compressor unit in accordance with  claim 1 , wherein the cylinder head is manufactured from cast iron. 
     
     
         5 . The refrigerant compressor unit in accordance with  claim 4 , wherein the cylinder head is manufactured from cast iron with graphite. 
     
     
         6 . The refrigerant compressor unit in accordance with  claim 5 , wherein the cylinder head is manufactured from cast iron with spheroidal graphite or vermicular graphite. 
     
     
         7 . The refrigerant compressor unit in accordance with  claim 1 , wherein the housing sleeve with the compressor housing portion, the cylinder housing block and the motor housing portion is manufactured from light metal, in particular aluminum. 
     
     
         8 . The refrigerant compressor unit in accordance with  claim 1 , wherein the housing sleeve with the compressor housing portion, the cylinder housing block and the motor housing portion is manufactured from a cast aluminum alloy with silicon. 
     
     
         9 . The refrigerant compressor unit in accordance with  claim 1 , wherein the housing sleeve with the compressor housing portion, the cylinder housing block and the motor housing portion is manufactured as a cast part, in particular from cast light metal. 
     
     
         10 . The refrigerant compressor unit in accordance with  claim 1 , wherein the cylinders are arranged in succession in the cylinder housing block in a row direction, which in particular runs parallel to the drive shaft. 
     
     
         11 . The refrigerant compressor unit in accordance with  claim 1 , wherein the cylinder housing block in addition to the cylinders also has recesses separate from the cylinders. 
     
     
         12 . The refrigerant compressor unit in accordance with  claim 1 , wherein the housing sleeve has mounting openings at the ends, which are closed by housing covers. 
     
     
         13 . The refrigerant compressor unit in accordance with  claim 12 , wherein the housing covers are manufactured from light metal, in particular aluminum. 
     
     
         14 . The refrigerant compressor unit in accordance with  claim 12 , wherein the housing covers are curved. 
     
     
         15 . The refrigerant compressor unit in accordance with  claim 12 , wherein one of the housing covers has a concave curvature extending into the housing sleeve. 
     
     
         16 . The refrigerant compressor unit in accordance with  claim 12 , wherein one of the housing covers has a convex curvature curving away from the housing sleeve. 
     
     
         17 . The refrigerant compressor unit in accordance with  claim 12 , wherein one of the housing covers is provided with at least one contact insert for passing through electrical connections. 
     
     
         18 . The refrigerant compressor unit in accordance with  claim 1 , wherein one of the housing covers is provided with a refrigerant connection. 
     
     
         19 . The refrigerant compressor unit in accordance with  claim 1 , wherein the housing sleeve is provided with an intermediate wall integrally molded thereon in one piece and separating the drive chamber from the motor compartment. 
     
     
         20 . The refrigerant compressor unit in accordance with  claim 19 , wherein a bearing portion is provided in the intermediate wall for the drive shaft passing through it. 
     
     
         21 . The refrigerant compressor unit in accordance with  claim 1 , wherein the cylinder head has a high-pressure connection for refrigerant. 
     
     
         22 . The refrigerant compressor unit in accordance with  claim 1 , wherein the cylinder head has a connection for refrigerant at low pressure. 
     
     
         23 . The refrigerant compressor unit in accordance with  claim 1 , wherein the sucked-in refrigerant flows through the motor compartment. 
     
     
         24 . The refrigerant compressor unit in accordance with  claim 23 , wherein the refrigerant flowing through the motor compartment is fed through a channel to a passage opening in the valve plate. 
     
     
         25 . The refrigerant compressor unit in accordance with  claim 23 , wherein the refrigerant enters an inlet chamber of the cylinder head after cooling the electric motor. 
     
     
         26 . The refrigerant compressor unit in accordance with  claim 24 , wherein the channel is molded into the intermediate wall. 
     
     
         27 . The refrigerant compressor unit in accordance with  claim 24 , wherein the channel is connected to a channel leading to the drive chamber. 
     
     
         28 . The refrigerant compressor unit in accordance with  claim 1 , wherein the cylinder housing block has at least one cylinder for compressing refrigerant starting from low pressure to medium pressure and at least one cylinder for compressing refrigerant from medium pressure to high pressure. 
     
     
         29 . The refrigerant compressor unit in accordance with  claim 28 , wherein the cylinder head has an inlet chamber for refrigerant at low pressure, an outlet chamber for refrigerant at medium pressure, an inlet chamber for refrigerant at medium pressure and an outlet chamber for refrigerant at high pressure. 
     
     
         30 . The refrigerant compressor unit in accordance with  claim 1 , wherein the cylinder head is provided with a pressure relief valve connected to the outlet chamber for refrigerant compressed to high pressure. 
     
     
         31 . The refrigerant compressor unit in accordance with  claim 1 , wherein the cylinder head is provided with a pressure relief valve connected to the inlet chamber. 
     
     
         32 . The refrigerant compressor unit in accordance with  claim 1 , wherein the cylinder housing block is arranged on the housing sleeve in such a way that the cylinders extend transversely to a vertical direction. 
     
     
         33 . The refrigerant compressor unit in accordance with  claim 1 , wherein the housing is arranged in an operating position such that the cylinder housing block, the valve plate and the cylinder head are arranged relative to the housing sleeve in a direction transverse to a vertical direction on one side of the housing sleeve. 
     
     
         34 . The refrigerant compressor unit in accordance with  claim 1 , wherein a lubricant bath forming in the drive chamber of the compressor housing portion is arranged in the vertical direction below the cylinders and at a spacing therefrom. 
     
     
         35 . The refrigerant compressor unit in accordance with  claim 1 , wherein a lubricant feed unit is provided in the compressor housing portion and receives lubricant from the motor compartment and feeds it to the lubricant bath in the compressor housing portion. 
     
     
         36 . The refrigerant compressor unit in accordance with  claim 1 , wherein the housing is provided with at least two mounting lugs which permit mounting of the housing in such a way that the cylinder housing block, the valve plate and the cylinder head are arranged relative to the housing sleeve in the direction transverse to a vertical direction on one side on the housing sleeve. 
     
     
         37 . The refrigerant compressor unit in accordance with  claim 35 , wherein the mounting lugs are arranged on the housing sleeve. 
     
     
         38 . The refrigerant compressor unit in accordance with  claim 1 , wherein the stator is mounted in the motor housing portion by way of support elements which are installed into the motor compartment and which, on the one hand, bear against a stator receiving surface of the motor housing portion and, on the other hand, surround the stator installed into the support elements on its outer side and support it resiliently relative to the stator receiving surface. 
     
     
         39 . The refrigerant compressor unit in accordance with  claim 38 , wherein the support elements have resilient bodies which are dimensioned such that they are in an elastically deformed state in all operating states of the motor housing portion occurring during operation of the refrigerant compressor. 
     
     
         40 . The refrigerant compressor unit in accordance with  claim 38 , wherein the support elements are arranged running around the stator and each support the stator on opposite sides of the rotor axis several times relative to the stator receiving surface of the motor housing portion. 
     
     
         41 . The refrigerant compressor unit in accordance with  claim 39 , wherein the support elements have resilient bodies arranged at defined angular intervals about the rotor axis. 
     
     
         42 . The refrigerant compressor unit in accordance with  claim 1 , wherein the resilient bodies are positioned relative to each other by a band material positioning them relative to each other and running around the stator. 
     
     
         43 . The refrigerant compressor unit in accordance with  claim 42 , wherein the resilient bodies are molded into the band material. 
     
     
         44 . The refrigerant compressor unit in accordance with  claim 42 , wherein the band material is formed as a ring-like clasp with open ends. 
     
     
         45 . The refrigerant compressor unit in accordance with  claim 1 , wherein the resilient bodies have flank regions running at an acute angle to at least one of i) the outer side of the stator and ii) the stator receiving surface between foot regions and support regions, of which the one bears against the outer side of the stator and the other bears against the stator receiving surface. 
     
     
         46 . The refrigerant compressor unit in accordance with  claim 1 , wherein the resilient bodies are successively molded into a resilient band material, so that successive support regions bear against an outer side of the stator or against the stator receiving surface and successive foot regions bear against the stator receiving surface or the outer side of the stator. 
     
     
         47 . The refrigerant compressor unit in accordance with  claim 1 , wherein the resilient bodies are located between edge regions arranged circumferentially around the stator and the support regions are connected to the edge regions by way of flank regions running at an acute angle to at least one of i) the outer side of the stator and ii) the stator receiving surface. 
     
     
         48 . The refrigerant compressor unit in accordance with  claim 47 , wherein, on the one hand, the support regions bear against the outer side of the stator or the stator receiving surface and, on the other hand, the edge regions bear against the stator receiving surface or the outer side of the stator. 
     
     
         49 . The refrigerant compressor unit in accordance with  claim 1 , wherein the support elements are formed from a resilient material, in particular spring steel. 
     
     
         50 . The refrigerant compressor unit in accordance with  claim 1 , wherein support elements arranged in succession in the direction of the rotor axis are positioned at a spacing from one another in the motor housing portion by a spacer element. 
     
     
         51 . The refrigerant compressor unit in accordance with  claim 1 , wherein one of the support elements is positioned with respect to its position in the motor housing portion by a step adjoining the stator receiving surface. 
     
     
         52 . The refrigerant compressor unit in accordance with  claim 1 , wherein the refrigerant compressor unit is configured for CO 2  as refrigerant.