Cooling jacket, especially for electrical machines and method for the manufacture thereof

Abstract

The invention relates to cooling jackets and/or heat exchangers, which are to be placed in contact with solid products that are to be cooled, especially with electrical machines with a rotor rotating inside or outside a stator, or in contact with reactors or containers. Said jackets and/or heat exchangers have an inner wall and an outer wall which form the boundary of a flow cavity that is provided with inlet and outlet means for a cooling medium and conducting means in order to form and/or limit at least one flow path for the cooling medium between the inner wall and the outer wall from the inlet means to the outlet means. According to the invention, opposing individual flat places or flat sections of the inner wall and the outer wall are in contact with one another within the confines of said walls and passages for the cooling medium remain between the contacting flat places of flat sections. One or more elevations and depressions alternate on one or more external sides or an outer casing of the inner or outer wall, wherein adjoining flat places or flat sections are permanently connected over individual joints and/or elongated joint sections.

1 . Cooling jacket or heat exchanger to be placed in contact with solid products to be cooled, including electrical machines with a rotor which rotates inside or outside a stator ( 19 ), or with reactors or containers, the cooling jacket or heat exchanger having an inner and outer wall ( 1 ,  2 ) which between themselves delimit a flow cavity ( 17 ) which is provided with inlet and outlet means ( 18 ) for a coolant, and conducting means for the formation or delimitation of at least one flow path for the coolant between the inner and outer wall ( 1 ,  2 ) from the inlet means to the outlet means ( 18 ), where mutually facing individual flat places or flat sections of the inner and outer wall ( 1 ,  2 ) contact each other within their edges, and passages ( 6 ) for the coolant remain between the contacting flat places or flat sections, and one or more elevations ( 5 ,  5   a ) and recesses ( 4 ,  4   a ) alternate on one or more external sides or an outer casing of the inner or outer wall ( 2 ), characterized by
 the mutually contacting flat places or flat sections being permanently connected via individual joints ( 3 ,  3   a ) or longitudinal joint sections ( 10 ).   
     
     
         2 . Cooling jacket according to  claim 1 , characterized by the elevations ( 5 ,  5   a ) and the recesses ( 4 ,  4   a ) presenting a convex curvature and a concave curvature respectively. 
     
     
         3 . Cooling jacket or heat exchanger according to  claim 2 , characterized by the joints ( 3 ,  3   a ) or joint sections ( 10 ) being implemented by fastening by welding, soldering, gluing, folding, clinching, screwing or riveting. 
     
     
         4 . Cooling jacket or heat exchanger according to  claim 3 , characterized by the joints ( 3 ,  3   a ) or joint sections ( 10 ) being arranged in the area of the recesses ( 4 ,  4   a ) of an external side of the inner or outer wall ( 2 ). 
     
     
         5 . Cooling jacket or heat exchanger according to  claim 4 , characterized by the recesses ( 2 ) or flow conducting means being implemented with the joints ( 3 ,  3   a ) or joint sections ( 10 ). 
     
     
         6 . Cooling jacket or heat exchanger according to  claim 5 , with a cylindrical or elongated or rotation symmetrical base form, characterized by—when viewed in a parallel alignment ( 9 ) or along a cylinder, longitudinal or symmetry axis—on the external surface or side of the inner or outer wall ( 2 ), elevations ( 5 ,  5   a ) alternating with recesses ( 4 ,  4   a ), where each elevation ( 5 ,  5   a ) or recess ( 4 ,  4   a ) is delimited on all sides in each case by recesses ( 4 ,  4   a ) or elevations ( 5 ,  5   a ) which are located outside of the alignment ( 9 ). 
     
     
         7 . Cooling jacket or heat exchanger according to  claim 6 , characterized by the flow conducting means being implemented with the joints ( 3 ,  3   a ) or joint sections ( 10 ) or connection or sections between the inner and outer wall ( 1 ,  2 ). 
     
     
         8 . Cooling jacket or heat exchanger according to  claim 7 , characterized by an arrangement of the joints ( 3 ,  3   a ) or joint sections ( 10 ) such that the flow paths of the coolant have a meandering course or turbulent course. 
     
     
         9 . Cooling jacket or heat exchanger according to  claim 8 , characterized by, in a circumferential direction (I-V) about the cylinder, longitudinal or symmetry axis, several longitudinal joint sections ( 10 ) of the inner and outer wall ( 1 ,  2 ) being offset alternately toward one edge ( 8 ) and to a facing edge ( 8   a ). 
     
     
         10 . Cooling jacket or heat exchanger according to  claim 9 , characterized by, in a circumferential direction (I-V) about the cylinder, longitudinal or symmetry axis or in a direction ( 9 ) parallel to the cylinder, longitudinal or symmetric axis, several joints ( 3 ,  3   a ) or joint sections ( 10 ) are arranged with mutual offset. 
     
     
         11 . Cooling jacket or heat exchanger according to  claim 10 , characterized by the joints ( 3 ,  3   a ) or joint sections ( 10 ) being arranged with regular structure or equal separations between each other. 
     
     
         12 . Cooling jacket or heat exchanger according to  claim 11 , characterized by mounting or fixation means ( 11 ,  12 ) on or in the outer or inner wall ( 2 ,  1 ) for attachment to a deformation device ( 13 ). 
     
     
         13 . Cooling jacket or heat exchanger according to  claim 12 , characterized by the inner or outer walls ( 1 ,  2 ) being implemented with plate parts having a thickness in the range of 0.3-2.00 mm. 
     
     
         14 . Cooling jacket or heat exchanger according to  claim 13 , with a hollow cylindrical base form where the cylinder peripheral material presents an axis-parallel butt seam or joint ( 21 ), which is formed by edges ( 14 ) of the inner and outer wall ( 1 ,  2 ), which edges face each other in the circumferential direction (I-V), characterized by the facing edges ( 14 ) being held together or immediately opposite each other by spring clamps, claw springs or other elastic clamping means or welding locations ( 15 ). 
     
     
         15 . Cooling jacket or heat exchanger according to  claim 14 , characterized by the outer or inner wall ( 1 ) being formed with a smooth exterior side to achieve a close fitting contact with the solid product. 
     
     
         16 . Cooling jacket or heat exchanger according to  claim 1 , characterized by both the inner wall ( 1 ) and also the outer wall ( 2 ), on their respective exterior sides, being formed with several alternating elevations ( 5 ,  5   a;    55 ,  55   a ) and recesses ( 4 ,  4   a;    44 ,  44   a ). 
     
     
         17 . Cooling jacket or heat exchanger according to  claim 16 , characterized by the alternating elevations ( 5 ,  5   a;    55 ,  55   a ) and recesses ( 4 ,  4   a;    44 ,  44   a ) extending symmetrically with respect to a middle line of the flow cavity, which middle line connects the joints ( 3 ,  3   a ) or joint sections ( 10 ). 
     
     
         18 . Cooling jacket or heat exchanger according to  claim 17 , characterized by the cooling jacket or heat exchanger being enclosed or enveloped by a cover jacket ( 22 ). 
     
     
         19 . Cooling jacket or heat exchanger according to  claim 18 , characterized by the cover jacket ( 22 ) having a greater wall thickness than that of the inner or outer wall ( 1 ,  2 ) of the cooling jacket or heat exchanger. 
     
     
         20 . Cooling jacket or heat exchanger according to  claim 19 , characterized by a structural integration with the cover jacket ( 22 ), like a shrink wrap. 
     
     
         21 . Cooling jacket or heat exchanger according to  claim 20 , characterized by the inlet and outlet means ( 18 ) for coolant extending by protrusion through the passages formed in the wall of the cover jacket ( 22 ). 
     
     
         22 . Method for the manufacture of a cooling jacket or heat exchanger with an internal and an outer wall ( 1 ,  2 ) and a flow path in between for coolant, the method comprising:
 a) forming a solid composite from two individual heat conducting plates ( 7 ) as inner and outer walls ( 1 ,  2 ), by connecting them permanently, one against the other, by their edges and within said edges via individual joints ( 3 ,  3   a ) or one or more longitudinal joint sections ( 10 )   b) after step a) forming a flow cavity ( 17 ) by internal high-pressure deformation between the inner and outer walls ( 1 ,  2 )   c) after step a) or b), attaching an inlet or outlet ( 18 ) for cooling fluid, which leads to the flow cavity ( 17 ) within the composite.   
     
     
         23 . Method according to  claim 22 , characterized by, for the formation of the solid composite, the two heat conducting plates ( 7 ) being placed one on top of the other, in a flat state, and welded or otherwise connected at their edges ( 14 ). 
     
     
         24 . Method according to  claim 22 , characterized by, for the formation of the solid composite, individual joints ( 3 ,  3   a ) or joint sections ( 10 ) being formed through its external side(s) or its outer casing, whereby facing inner sides of the inner or outer wall ( 1 ,  2 ) are connected to each other. 
     
     
         25 . Method according to  claim 24 , characterized by the application of the individual joints ( 3 ,  3   a ) or joint sections ( 10 ) being achieved by welding through the inner or outer wall ( 1 ,  2 ). 
     
     
         26 . Method according to  claim 25 , characterized by the joint places ( 3 ,  3   a ) or sections ( 10 ) being are produced by point, circular or line welding on the exterior side of the inner or outer wall ( 1 ,  2 ). 
     
     
         27 . Method according to  claim 26 , characterized by the solid composite being adapted by deformation to the external contour(s) of a product ( 19 ) to be cooled, to apply the cooling jacket or heat exchanger with the exterior side of its outer or inner wall ( 1 ) with as close fitting a contact as possible to the product ( 19 ). 
     
     
         28 . Method according to  claim 27 , characterized by, for the deformation, the still flat plate composite ( 1 ,  2 ;  7 ) is plastically deformed by means of a deformation device ( 13 ) or by means of a support body whose external contour corresponds to that of the product ( 19 ) to be cooled. 
     
     
         29 . Method according to  claim 28 , characterized by, for the deformation, the still flat plate composite ( 1 ,  2 ;  7 ) is bent to a cylindrical shape about a deformation core ( 13 ) or a support body, and connected to edges ( 14 ) which are located opposite or abut against each other. 
     
     
         30 . Method according to  claim 29 , characterized by holding the plate composite ( 1 ,  2 ;  7 ) with the exterior side of its outer or inner wall ( 1 ) by means of fixation means ( 11 ,  12 ) in contact with the deformation device ( 13 ) or the support body. 
     
     
         31 . Method according to  claim 30   30 , characterized by pressing the plate composite ( 1 ,  2 ;  7 ) for its fixation in the area of the welding or other joints ( 3 ,  3   a ) on the support body or the deformation device ( 13 ). 
     
     
         32 . Method according to  claim 31 , characterized by the plate composite being pressed on the support body or deformation device before step b). 
     
     
         33 . Method according to  claim 32 , characterized by the internal high-pressure deformation being carried out by introducing a fluid pressure medium between the inner and outer wall ( 1 ,  2 ). 
     
     
         34 . Method according to  claim 33 , using a deformation device ( 13 ) for the deformation the solid plate composite ( 1 ,  2 ;  7 ), where, for the formation of the solid composite, individual joints ( 3 ,  3   a ) or joint sections ( 10 ) are applied over its external side(s) or its outer casing, which results in the mutual connection of facing internal sides or interior flat places of the inner or outer wall ( 1 ,  2 ), characterized by, during the phase of internal high-pressure deformation, positioning holding-down devices in contact with the external side(s) or the outer casing of the outer wall ( 2 ) in the area of the joints ( 3 ,  3   a ) or joint sections ( 10 ) or in the area of a peripheral seam or of a welded peripheral edge, to hold the composite ( 1 ,  2 ;  7 ) with the exterior side of its outer or inner wall ( 1 ) in contact with the deformation device ( 13 ). 
     
     
         35 . Method according to  claim 34 , characterized by coating the external side of the outer or inner wall ( 1 ) with a coating made of a coating substance that improves the heat transfer. 
     
     
         36 . Method according to  claim 36 , where the cooling jacket or heat exchanger is used for a stator ( 19 ) of an electric machine without casing, which stator is impregnated with casting or impregnation resin, characterized by moving the inner wall ( 1 ) of the deformed plate composite ( 1 ,  2 ;  7 ) into contact with the stator ( 19 ), for as long as the casting or impregnation resin has not yet hardened completely. 
     
     
         37 . Method according to  claim 36 , characterized by impregnating the stator ( 19 ), in the area of its external margin or external periphery, with casting or impregnation resin. 
     
     
         38 . Method according to  claim 37 , characterized by, before the impregnation, mounting the cooling jacket on a solid product to be cooled. 
     
     
         39 . Cooling arrangement with an electric machine or with a reactor or container, having a jacket or enclosure of the electric machine or its stator ( 19 ), the reactor or the container, with an inner wall ( 1 ) of a cooling jacket or a heat exchanger, the cooling jacket or heat exchanger having an inner and outer wall ( 1 ,  2 ) which between themselves delimit a flow cavity ( 17 ) which is provided with inlet means and outlet means ( 18 ) for a coolant, and conducting means for the formation or delimitation of at least one flow path for the coolant between the inner and outer wall ( 1 ,  2 ) from the inlet means to the outlet means ( 18 ), where mutually facing individual flat places or flat sections of the inner and outer walls ( 1 ,  2 ) contact each other within their edges, and passages ( 6 ) for the coolant remain between the contacting flat places or flat sections, and one or more elevations ( 5 ,  5   a ) and recesses ( 4 ,  4   a ) alternate on one or more external sides or an outer casing of the inner or outer wall ( 2 ), characterized by
 the mutually contacting flat places or flat sections being permanently connected via individual joints ( 3 ,  3   a ) or longitudinal joint sections ( 10 ).   
     
     
         40 . Cooling arrangement according to  claim 39 , characterized by protruding elevations ( 55 ,  55   a ) formed on the inner wall ( 1 ) of the cooling jacket and only the inner wall ( 1 ) of the cooling jacket being in a heat transferring contact via its protruding elevations ( 55 ,  55   a ) with an outer casing or an outer wall of the stator ( 19 ). 
     
     
         41 . Arrangement according to  claim 40 , characterized by a coating with plastically deformable heat conducting means between the external side of the inner wall ( 1 ) and the external contour of the stator. 
     
     
         42 . Arrangement according to  claim 41 , where stator windings ( 20 ) of the electrical machine are cast or impregnated with a casting or impregnation compound, characterized by the casting or impregnation compound being also located between the exterior side or the concave outer casing of the inner wall ( 1 ), and the outer casing of the stator ( 19 ) or stator casing.