Accumulator for combined component with internal heat exchanger especially for refrigerant loops with r774 as working fluid

Abstract

A coolant accumulator including an accumulation tank with a suction pipe assembly, wherein the suction pipe assembly includes an external suction pipe and an internal suction pipe which are positioned coaxially and at a distance from each other, and connected with each other by way of a connecting piece at the respective lower ends of the suction pipes to form a flow path, and wherein the connecting piece features a radially positioned oil balancing bore which connects an oil sump region of the accumulation tank with the flow path in the suction pipe assembly.

What is claimed is: 
     
         1 . A coolant accumulator for a motor vehicle coolant circuit comprising:
 an accumulation tank;   a suction pipe assembly disposed in the accumulation tank, the suction pipe assembly including an external suction pipe and an internal suction pipe positioned coaxially with an annular gap formed therebetween; and   a connecting piece connecting a lower end of the external suction pipe with a lower end of the internal suction pipe to form a flow path, the connecting piece including a radially extending oil balancing bore connecting an oil sump region of the accumulation tank with the flow path.   
     
     
         2 . The coolant accumulator according to  claim 1 , wherein the oil balancing bore is formed in the connecting piece at a point intermediate the lower end of the internal suction pipe and a lower end of the connecting piece. 
     
     
         3 . The coolant accumulator according to  claim 1 , wherein the oil balancing bore is formed in the connecting piece at a midpoint between the lower end of the internal suction pipe and a lower end of the connecting piece. 
     
     
         4 . The coolant accumulator according to  claim 1 , wherein the connecting piece includes a rounded ring-shaped contour to facilitate a 180 degree flow reversal in the flow path. 
     
     
         5 . The coolant accumulator according to  claim 1 , wherein the connecting piece includes a pine tree profile configured to receive the lower end of the external suction pipe. 
     
     
         6 . The coolant accumulator according to  claim 5 , wherein the lower end of the external suction pipe is shrink-fitted onto the pine tree profile of the connecting piece. 
     
     
         7 . The coolant accumulator according to  claim 1 , wherein a thickness of a wall of the connecting piece in a region of the oil balancing bore is between 0.4 mm and 3 mm. 
     
     
         8 . The coolant accumulator according to  claim 1 , wherein a diameter of the oil balancing bore is between 0.2 mm and 3 mm. 
     
     
         9 . The coolant accumulator according to  claim 1 , wherein the oil sump region of the accumulation tank is conically tapered. 
     
     
         10 . The coolant accumulator according to  claim 1 , wherein a filter surrounds the connecting piece in a region of the oil balancing bore. 
     
     
         11 . The coolant accumulator according to  claim 10 , wherein the filter is a filter ring. 
     
     
         12 . The coolant accumulator according to  claim 11 , further comprising annular bulges formed on the connecting piece configured to receive the filter ring. 
     
     
         13 . The coolant accumulator according to  claim 1 , wherein the accumulation tank is disposed in a pressure-resistant outer container. 
     
     
         14 . The coolant accumulator according to  claim 13 , further comprising an internal heat exchanger disposed between the accumulation tank and the outer container. 
     
     
         15 . The coolant accumulator according to  claim 14 , wherein the internal heat exchanger is configured as a coiled tube. 
     
     
         16 . The coolant accumulator according to  claim 14 , wherein the internal heat exchanger is disposed in an upper portion of the coolant accumulator between the accumulation tank and the outer container. 
     
     
         17 . The coolant accumulator according to  claim 1 , wherein the accumulation tank is produced from a synthetic material. 
     
     
         18 . The coolant accumulator according to  claim 1 , wherein the accumulation tank is produced from one of polybutylene terephthalate, polyethylene, and polypropylene. 
     
     
         19 . The coolant accumulator according to  claim 1 , wherein the accumulation tank includes an accumulation tank cover. 
     
     
         20 . The coolant accumulator according to  claim 19 , wherein the accumulation tank cover is a cyclone.