Heat exchanger and method of manufacturing

1. A heat exchanger system comprising a rotating machine element situated in a housing; at least one pipe ( 1 ) and at least one lamina ( 2 ) for exchanging heat between a first coolant that flows through the pipe ( 1 ) at least one and a second coolant that wets the heat exchanger under the influence of centrifugal forces in order to be cooled and to be available to further cool the rotating machine element ( 3 ),

wherein the heat exchanger is of ring-shaped and, essentially surrounds the rotating machine element ( 3 ) and is furthermore integrated into the housing ( 4 ); and, wherein the at least one pipe ( 1 ) is a flat pipe having a width side facing inward towards the rotating machine element that is curved on a length side of said at least one pipe ( 10 ), the lamina ( 2 ) being attached to the width side facing inward towards the rotating machine element, and the width side of the at least one pipe ( 10 ) situated substantially parallel to the axis of rotation (R) of the rotating machine element.

2. The heat exchanger system according to claim 1 , wherein the lamina ( 2 ) is provided with a jacket ( 21 ) having openings ( 20 ), the openings ( 20 ) extending parallel to the width side ( 10 ) of the at least one flat pipe.

3. The heat exchanger system according to claim 2 , wherein the openings ( 20 ) are designed and situated so that the second coolant can flow into the lamina ( 2 ) and across the width side ( 10 ) of the at least one flat pipe, and can flow out of the lamina ( 2 ).

4. The heat exchanger system according claim 1 , further comprising at least two end chambers ( 30 ) wherein at least one of said at least two end chambers ( 30 ), is situated at each ends of the at least one flat pipe ( 1 ).

5. The heat exchanger system according to claim 4 , wherein one or more straps are situated on at least one of the end chambers ( 30 ) in order to join the two end chambers ( 30 ) together.

6. The heat exchanger system according to claim 1 , further comprising a sump wherein the second coolant flows into said sump, such that said second coolant can be reached by the rotating machine element.

7. The heat exchanger system according to claim 1 , wherein an end chamber ( 30 ) for supplying and removing the first coolant is situated at one end of the at least one flat pipe ( 1 ).

8. The heat exchanger system according to claim 1 , wherein the at least one flat pipe ( 1 ) in which the first coolant flows is either a soldered or a welded flat pipe ( 1 ) with an inner insert ( 40 ) or a flat pipe manufactured by an extrusion process.

9. The heat exchanger system according to claim 1 , wherein the lamina ( 2 ) has a rippled contour with numerous cuts at offset positions with ripples running perpendicularly to or obliquely to the pipe ( 1 ) at least one.

10. A method for producing a heat exchanger system from at least one flat pipe and at least one lamina, said at least one flat pipe having two ends a width side, and end chambers, said method comprising the steps of:

a) placing a lamina on the width side of the at least one flat pipe;

b) affixing said end chambers to the ends of the at least one flat pipe;

c) joining the end chambers to said ends using metal material;

d) curving the flat pipe-lamina assembly in order to produce a ring-shaped heat exchanger;

e) providing a rotating machine element in a housing; and,

f) inserting the ring-shaped heat exchanger into the housing in order to cool a coolant of the rotating machine element.

11. The method according to claim 10 , wherein step a) includes placing a jacket ( 21 ) provided with openings on the outer side of the lamina ( 2 ).

12. The method according to claim 10 , wherein the end chambers ( 30 ) are joined together by one or more straps situated on at least one end of the chambers ( 30 ).