The invention relates to the heat exchanger technology and can be used to create the conditions for optimal and trouble-proof operation of the refrigerant system due to the additional cooling of the compressor.

Already known cooling system, having a closed loop of the compressor housing with a cooling jacket for compressing of the refrigerant, a condenser for condensing of the compressed refrigerant into a liquid refrigerant, and a condensed liquid pump for cooling of the compressor housing. The compressor housing is thermally coupled to the cooling case through which a cooling liquid flows. The condensed liquid pump pumps a condensed liquid refrigerant from the condenser through the cooling jacket, cooling the compressor housing, and then to the compressor cylinder head exhaust manifold, where the liquid refrigerant mixes with and cools the hot compressor discharge gas. (Patent US5694780, publ. 1995- 12-01)

Also known a method for cooling a compressor motor and a cooling circuit utilizing refrigerant that enters in the condenser to cool a motor and electromagnetic bearings The motor drives a compressor, while the electromagnetic bearings support the motor rotor during operation of the compressor. Liquid refrigerant from the condenser is expanded into a two-phase mixture, passed over the stator, expanded a second time, passed over the bearings and between the stator and rotor, before being returned to an evaporator. (Patent US2015226467 (Al ), publ. 2015-08-13). The closest to the proposed is an apparatus for compulsive cooling of compressor oil in a refrigeration system, which is a method and apparatus for cooling the compressor oil in the refrigeration system by passing the oil through a heat exchanger, cooled by the evaporating refrigerant. The refrigerant is pumped into the heat exchanger by means of a liquid refrigerant. The use of the pump eliminates the need for a mixing pipe with an internal nozzle and also provides oil cooling with minimal noise near the refrigeration unit. (Patent US6145326 (A), publ. 2000-1 1-14)

The technical aim of the invention is to provide an additional protection of the refrigerant compressor from overheating by additional cooling of the compressor oil.

The set problem is solved by a refrigerant compressor with external cooling, containing the housing inside which there are: a crankshaft, rotor, stator, compression chamber, oil sump and outside the housing there are a pipe for refrigerant inlet and a pipe for refrigerant outlet. According to the invention, the fact that in the oil stump of the refrigerant compressor with external cooling there is a line for the passage of heat-removing medium, the ends of which are connected to the inlet pipe of the heat-removing medium and the outlet pipe of the heat- removing medium, which are located outside the housing, and as a heat-removing medium can be used any medium which temperature is lower than the oil temperature in the oil sump.

Description of the figures:

Fig. 1 - shows a refrigerant compressor with external cooling

where:

1 - housing; 2 - crankshaft; 3 - rotor; 4 - stator; 5 - compression chamber; 6 - oil sump; 7 - pipe for refrigerant inlet; 8 - pipe for refrigerant outlet; 9 - a line for passage of a heat-removing medium; 10 - pipe for the entrance of the heat- removing medium; 1 1 - pipe for the outlet of the heat-removing medium.

The technical aim of the invention is to provide an additional protection of the refrigerant compressor from overheating by cooling of the compressor oil.

The set problem is solved due to refrigerant compressor with external cooling containing housing 1 , inside which there are: crankshaft 2, rotor 3, stator 4, compression chamber 5, oil sump 6 and outside on the housing 1 there are pipe for refrigerant inlet 7 and pipe for refrigerant outlet 8, characterized by the fact that in the oil sump 6 of the refrigerant compressor with external cooling there is a line for the passage of heat-removing medium 9, the ends of which are connected to the inlet pipe of the heat-removing medium 10 and the outlet pipe of the heat- removing medium 1 1 , which are located outside the housing 1 , and as a heat- removing medium can be used any medium which temperature is lower than the oil temperature in the oil sump 6.

The external refrigerant compressor works as follows:

The refrigerant in the cooled state through the pipe for the refrigerant inlet 7 enters the compression chamber 5 of the refrigerant compressor with external cooling, where as a result of compression, it is heated and already in the hot state through the outlet pipe for the outlet of the refrigerant 8 comes out of the refrigerant compressor with external cooling. In this case, all moving parts of the refrigerant compressor with external cooling, namely: the crankshaft 2, the rotor 3, and the compression chamber 5 are being lubricated and give their excess heat to the oil contained in the oil sump 6.

The refrigerant compressor with external cooling is characterized by the fact that the line for the passage of the heat-removing medium 9 is located in the oil sump 6 of the refrigerant compressor with external cooling and immersed in oil, the temperature of which is higher than the temperature of the heat-removing medium. Therefore, the heat-removing medium, when passing along the line for the passage of heat-removing medium 9, removes excess heat from the oil and moves it outside, thereby providing additional protection of the refrigerant compressor with external cooling from overheating. In this case, as a heat-removing medium can be: antifreeze, water, oil, or condensate, which is produced by the evaporator of the refrigerant system. That is, any medium which temperature is lower than the oil temperature in the oil sump 6 of the refrigerant compressor with external cooling.