WO2009053496A2

WO2009053496A2 - Cooling jacket, especially for electrical machines and method for the manufacture thereof

Info

Publication number: WO2009053496A2
Application number: PCT/EP2008/064555
Authority: WO
Inventors: Joachim Braun; Peter Lemke; Günther SONNAUER
Original assignee: Baumüller Nürnberg GmbH
Priority date: 2007-10-25
Filing date: 2008-10-27
Publication date: 2009-04-30
Also published as: US20110083834A1; EP2203969A2; WO2009053496A3; DE102007055910A1

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.

Description

Cooling jacket, in particular for electrical machines, and production method therefor

The invention relates to a cooling jacket and / or heat exchanger, which for investment in cooling objects solid shape (solid products) such. As electrical machines,

Reactors or containers are provided. The cooling jacket / heat exchanger has an inner and outer wall, which define a flow cavity between them. This is provided with inlet and outlet means for cooling medium and with guide means for forming and / or limiting at least one flow path for the cooling medium, wherein the flow path extends between the inner and outer walls of the inlet means to the outlet means. The inner wall has a smooth or largely smoothed outside, which is associated with the solid product or object to be cooled for full investment in it.

In particular, with regard to electrical machines with external rotor and inner stator and the reverse arrangement principle is within the scope of the invention, that is, the outer wall of the cooling jacket has a smooth upper or outer surface for full contact with objects to be cooled solid shape (solid products).

Housing for units of solid design, which are interspersed by cooling coils or cooling channels can be finished only with great effort from stainless chromium-nickel steel. The production of the housing is expensive, and the solid state units, such as electric motors must be shrunk into such housing. The

Inserting cooling hoses or tubes is time consuming. For this purpose, the hoses or pipes must still be provided with suitable connections for the supply of liquid, for which hoses or screw connections with seals are generally used. Both solutions can be leaking due to aging. In many cases one is

Repair of such a cooling system if damaged or leaking, in many cases difficult or impossible. Electric motors in which the stator of a double-walled cooling jacket with flow channels for cooling medium in

Inner is included, for example, from the manufacturer "PHASE

MOTION CONTROL ", 16141 Genoa, Italy known under the type designation" Squid Torque Motor ". An inner housing shell is shrunk directly onto the stator lamination and provided with radially outwardly projecting dividers, which rotate helically. Accordingly, the remaining between them

Cooling channels also helical. An outer housing jacket covers these cooling channels to the outside.

US-A-3 075 103 describes a fluid-flow cooling ring for sealed electric motors. The stator is covered by a pressure vessel. A structurally integrated heat exchanger is formed with parallel grooves, which are incorporated in the inner surface of the pressure vessel. The open side of the grooves is covered by a steel cylinder concentric with the motor shaft. At its radially inwardly facing outside are cooling copper windings, which are in thermal contact with the stator windings. For this purpose, the radially inwardly facing surface of the cylinder inner shell is formed evenly circular cylindrical. In a similar way, that indicates

Pressure vessel an outer shell with a smooth surface.

US-A-30 09 072 describes fluid cooled motors which are surrounded by a cooling jacket. The aim is to produce as intense an intense thermal contact between the electric sheet of the motor and / or its housing and the cooling jacket, with a compact

Construction. For this purpose, groove channels are formed in the stator or in the motor shaft or in the rotor and / or in a surrounding, outer housing shell. On the other hand, a sandwich arrangement with two concentric layers or layers is inserted between the stator / rotor electrical steel on the one hand and the outer housing jacket on the other hand. The sandwich arrangement is like this then between the outer housing shell on the one hand and the electric sheet of the engine on the other. In a further production step, a pressure medium is blown in between the two layers of the sandwich arrangement, whereby both sandwich layers are pressed against the respective surfaces of the motor electric sheet and the surrounding, outer casing shell. In the process, the groove channels incorporated into the electrical sheet and / or the inner wall of the outer casing shell press and form onto the respective layer or layer of the sandwich arrangement. This creates passages for cooling fluid between the two layers of the now expanded sandwich assembly. However, there is the disadvantage that after escape of the pressure medium from the sandwich structure, these easily deformed back to an elastic deformation portion and thereby stand out from the electrical sheet and / or housing, which increases the heat transfer resistance critical and the effectiveness of

Reduced heat dissipation. In addition, the production cost is increased by the formation of groove channels in the electrical steel or in the housing inner wall.

WO 00/54 991 describes an arrangement with a flow-through cover and an electric wheel motor within a wheel hub, which carries a tire. Through the middle of the electric wheel cooling air is passed and directed through the cover. A cover ring is connected to the wheel motor edge by means of a clamping element.

[007] Because of further technical background literature is on

DE 1 231 797, DE 1 136 412, DE 961 186 and DE 28 36 903.

In contrast, the invention is based on the object, in a double-walled cooling jacket of the generic type

To simplify the manufacturing process. For the solution, reference is made to the specified in claim 1 cooling jacket or heat exchanger. One

Production method for such a cooling jacket or heat exchanger is specified in claim 22. The claim 39 specifies a cooling arrangement with an electric machine and a cooling jacket or heat exchanger according to the invention. Advantageous, optional embodiments of the invention will become apparent from the dependent claims.

According to the invention between the inner and outer walls within their edges only selectively permanent connection points or lines or sections are formed between which is provided for space to create coolant flow passages in the flow cavity. This results in a non-smooth, the

Outside environment facing outer side of the outer wall. Elevations which are formed by the flow passages alternate with depressions which coincide with the joints or joining sections. Thus, the outer jacket of the outer wall extends, for example, with respect to a ground plane or a

Base circle or cylinder of the cooling jacket over the alternating elevations and depressions uneven or wavy. As a result, the outer surface of the cooling jacket or heat exchanger in contact with the external environment is considerably increased, which improves the effectiveness of the heat transfer. However, the most important factor is the cooling of the smooth surface from the inside.

In the cooling arrangement according to the invention with an electric machine and a cooling jacket / heat exchanger, the advantage is achieved to be able to cool caseless or vollgeblechte stators without producing a supporting housing or

To feed cooling hoses or tubes into the stator.

In the invention, since the cooling jacket does not constitute a mechanically supporting component of the engine construction, a complete separation of functions between mechanical support structure and cooling is provided. As a result, the wall thickness of the cooling jacket or its inner and outer walls can be selected to be very thin on the one hand which makes the use of high-quality materials such as stainless chrome-nickel steel economical. In particular, when using this material can be appropriately realize thicknesses of 0.3 -2.0 mm, for example, 0.8 mm for the inner and outer walls. On the other hand, if liquid cooling is not needed, the entire cooling system can be eliminated by simply omitting or removing the cooling jacket.

The discussed in the above-mentioned prior art problem - lifting the double-walled cooling jacket of the incorporated in boundary surfaces groove channels after after

Pressing on a relieving of forming pressure has occurred - is specifically avoided according to the invention in that the formation or inflation of the channel structure takes place on a separate device. The resulting, pillow-like structure is stretched only after relief of forming pressure on the object to be cooled or otherwise permanently pressed to this. This ensures direct contact of the wall of the channel system of the cooling jacket with the object to be cooled.

In the context of the invention, the joints and / or sections with staples or welding or soldering can be produced.

For screws and / or rivets additional sealing measures are required. The stapling or welding is advantageous insofar as can be used to welding robots, which are used for mounting the

Welding or stitching points can be programmed in advance accordingly. This programming can for example be made such that an arrangement of the joints and / or joining sections results, resulting in meandering flow paths of the cooling medium, possibly with turbulence result. Furthermore, results on the

Basis of the invention, the advantageous embodiment that the wells and / or flow guide are structurally simple realized with the joints and / or joining sections. Thus, the cooling jacket with its inner wall can fit snugly against the solid object to be cooled, a shape adaptation to the solid object is necessary, which can be accomplished, for example, with a forming device. In this context, it is expedient to form mounting and / or fixing means on or in the outer and / or inner wall of the cooling jacket in order to enable the attachment to the forming device.

To improve the heat transfer of the cooling jacket / heat exchanger inside and / or to be cooled

Solid object to be provided on its outer surface or side with a heat transfer improving coating. Preferably, this coating consists of a viscoelastic polymer, which is applied for example to the inside of the cooling jacket and after installation of the cooling jacket small

Bumps both the outer surface of the product to be cooled and the inner surface of the cooling jacket compensates. Such coatings can be obtained with products available on the market, such as ISO-PUR K 750 / HDI23-2000 (transparent, unfilled, cold-curing 2-component

Polyurethane casting resin) offered by ISO-ELEKTRA GmbH, Im Mühlenfeld 5, 31008 Elze. An alternative PU potting compound can be realized with the product Rhenatech® PU 4714 FR with hardener PU4900, offered by the company Beckelectrical insulation GmbH, Goßmannstraße 105, 20539 Hamburg. Suitably, such polymeric viscoelastic coatings are applied to improve the heat transfer prior to assembly of the cooling jacket on the outer surface of the solid product to be cooled and / or the inside of the cooling jacket. The use of thermal compounds or adhesives is already known per se. The disadvantage here is the handling during assembly and the risk of contamination, especially if the product to be cooled, including the cooling jacket should finally be painted. Another advantage of the polymer coating comprehensive training is to easily remove an already mounted cooling jacket / heat exchanger in case of damage from the engine or other product to be cooled and replace.

To compensate for bumps, gaps, vacancies or the same between the outside of the cooling jacket inner wall of the opposite outer side of the product to be cooled is a supplementary or alternative possibility is casting compound or impregnating resin, which in any case for the

Statorblech or the stator windings are used to use for the stated purpose. An additional coating material for the purposes mentioned could then be omitted. As long as the potting compound for the stator or its windings or for another similar product is not fully cured, it is expedient to mount the cooling jacket within the scope of the invention. Then automatically results in a shape adaptation of the potting compound on existing bumps, clear spaces, etc. between the opposite outer sides of the cooling jacket and the product to be cooled. As long as this casting compound or the usual for electrical sheets and windings of stators impregnating resin is not yet cured, it can spread between the opposite contact surfaces of cooling jacket and product to be cooled and thus close about any existing heat transfer gaps. When using the casting compound used in any case for the product to be cooled, such as the motor stator, the additional step required for the above-described invention training - applying a polymeric viscoelastic intermediate coating - can be dispensed with. Unevenness on the circumference of the product to be cooled, such as electric motor and / or on the outside of the inner wall of the cooling jacket can also be filled or compensated with potting compound. It is also an invention training conceivable, after which the cooling jacket is mounted before the above-mentioned impregnation process. As a result, the impregnating resin can penetrate between the cooling object, for example the stator, and the cooling jacket. The penetration can optionally be further improved by the fact that the cooling jacket in the interior of each circular weld for connecting the inner and outer metal sheet has a hole through which penetrate even on the outer surface even when soaking resin or air can escape.

According to an optional invention training the elevations and depressions are curved convex or concave in the cooling jacket and / or heat exchanger.

According to an optional invention training are the cooling jacket and / or heat exchanger, the joints and / or - sections (10) with stitching or welding, soldering, gluing,

Folding, clinching, screwing and / or riveting realized.

According to an optional invention training the joints and / or joining sections are arranged in the region of the recesses of the respective outer side of the inner or outer wall of the cooling jacket and / or heat exchanger.

According to an optional invention training the recesses and / or flow-conducting means are realized with the joints and / or joining sections in the cooling jacket and / or heat exchanger.

According to an optional invention training alternate with the cooling jacket and / or heat exchanger, which has a cylindrical and / or elongated and / or rotationally symmetric basic shape - seen in alignment parallel to or according to the cylinder, longitudinal or symmetry axis - on the outer surface or side of the inner or outer wall elevations with depressions, wherein each elevation or depression on each side is limited by out-of-flight depressions or elevations.

According to an optional invention training the flow-guiding means are realized with the joints and / or joining sections and / or connection points or sections between the inner and outer walls of the cooling jacket and / or heat exchanger.

According to an optional invention training in the cooling jacket and / or heat exchanger, an arrangement of

Joints and / or joint sections such that the or

Flow paths of the cooling medium meandering and / or over

Turbulences run.

According to an optional invention training are the cooling jacket and / or heat exchanger, comprising a cylindrical and / or elongated and / or rotationally symmetrical

Basic shape, in a circumferential direction around the cylinder, longitudinal and / or

Symmetryeachse several elongated joining sections of the interior and

Outer wall alternately offset more towards one edge and more towards an opposite edge.

According to an optional invention training are the cooling jacket and / or heat exchanger, having a cylindrical and / or elongated and / or rotationally symmetric basic shape in a circumferential direction about the cylinder, longitudinal and / or symmetry axis and / or in a direction parallel to Cylinder, longitudinal and / or

Symmetryeachse several joints and / or joining sections offset from each other.

According to an optional invention training in the cooling jacket and / or heat exchanger, the joints and / or Joining sections arranged with regular structure and / or uniform distances from each other.

According to an optional invention training are the cooling jacket and / or heat exchanger mounting and / or fixing means on or in the outer and / or inner wall for attachment to a

Forming device given.

According to an optional invention training the inner and / or outer walls with sheet metal parts of a thickness of 0.3 to 2.00 mm, for example, 0.8 mm, realized in the cooling jacket and / or heat exchanger.

According to an optional invention training are the cooling jacket and / or heat exchanger, comprising a hollow cylindrical basic shape, wherein the cylinder circumferential skirt has an axially parallel butt seam or joint, which by circumferentially opposite edges of the inner and

Outside wall is formed, the opposite edges by spring clips, claw springs or other elastic clamping means and / or welds held together or directly opposite.

In order to ensure an effective heat exchange between the object to be cooled associated with the cooling system and / or heat exchanger associated plant side and the outside environment, the outer or inner wall are formed with a smooth or largely smoothed outside for full investment in the solid state product.

In the above embodiments of the first Erfindungsvarante a separate operation of fixing on a forming device is necessary. Furthermore, the cooling jacket thus obtained must still by suitable clamping means on the motor to be cooled or be fixed to another cooling object. In this case, a high clamping force in the circumferential direction is necessary to ensure a sufficient contact pressure of the cooling jacket around the cooling object.

In order to save costs for the cooling jacket or its doppelwandingen structure thin sheets are used, for example, tenitischem steel, but this results in a certain sensitivity of the cooling jacket against mechanical damage from the outside. The remedy serve the following Erfindungsweiterbildungen:

After that the cooling jacket performing

Sheet metal sandwich was bent after its welding to a cylinder jacket, it is provided with connections, which are preferably welded in the form of threaded flanges directly to the cover plate of the cooling jacket or sheet sandwich. Now, a second sheet metal cylinder is manufactured as a cover, which can consist of normal steel sheet for cost savings. This jacket is made thick-walled than the individual sheets of the cooling jacket. For example, if the individual sheets are 0.8 millimeters thick, the thickness of the top coat is 2.5 millimeters or more. This cover is provided with holes or other openings through which later the inlet / outlet connection flanges or other connection elements of the cooling jacket can protrude. Furthermore, the cover is welded to a cylinder, depending on the development of the cylinder by means of a longitudinal or by means of a spiral seam. The cover is dimensioned in its dimensions so that in the

Cavity of the cooling jacket with only a small clearance fits into it. In a next production step, the cooling jacket is pushed into the cover or its cavity. The fact that the cooling jacket itself is not yet welded to the cylinder, the threaded flanges or other connection elements with appropriate

Placement by elastic deformation of the cooling jacket during Insert from the inside through the prepared holes in the cover.

To mount the cooling jacket on the engine, the two coaxial preassembled sheaths are pushed axially onto the cylindrical motor section to be cooled. Subsequently, the

Channel structure expanded by high-pressure internal forming by means of water or oil. In this case, a much higher pressure is now required than in the above-described first variant of the invention with optional developments, in which the cooling jacket is fixed and pressed on a forming device alone. By the second

Variant variant to be used according to the invention, the thicker sheet metal of the covering jacket is also deformed. In contrast to the cooling jacket, in which the channel structure is formed, the cover is stretched mainly in the circumferential direction, depending on the internal pressure elastic or elastic-plastic. When the pressure is released, the existing, very high pretension of the covering jacket leads to a large radial force component inwards. Because the channel pattern of the cooling jacket represents a structure of relatively high spatial frequency with proportions of material in the radial direction, the cooling jacket is so stiff in the radial direction with two-dimensional force introduction that a large part of the bias is retained in the cover and its radial component is effective as a contact force for the cooling jacket, to press this on the engine while reducing the heat transfer resistance. Compared to the pressing of the cooling jacket alone on a forming device according to the first variant of the invention arise in the second variant of the invention by the higher, possible pressure when pressed with the cover larger contact surfaces on the engine. There is a largely complete adaptation of these surfaces to any unevenness of the motor outer shell, at least if these bumps do not exceed a certain spatial frequency. To improve the heat transfer of the

Cooling jacket or the engine surface again here, as in the first

Invention variant, be provided before assembly with a heat transfer improving coating, which then compensates even small bumps higher spatial frequency.

The second variant of the invention is characterized in particular by the approach to impose the cooling jacket performing structure directly on the object to be cooled, for example stator of an electric motor, using the cover, in order in this way a cross-compression composite of the cover, cooling jacket and

Motor or other object to be cooled (reactor, vessel, container) produce. One advantage is that the pressing under the cover creates a symmetrical cushion or channel structure. As a result, the local deformation in the region of the joints or joining sections, for example, the Schweißteinbrampf, lower.

In addition, due to the radial pressure on the cooling jacket, a pressure bias is created in the weld seams delimiting the meandering or cushioning structure of the cooling jacket. Thus, the method according to the second variant of the invention in this respect is similar to the method of autofrettage, in which the targeted overstretching by means of internal pressure

Pressure biases are generated. As a result, this composite possesses an order of magnitude greater durability up to fatigue strength against pulsating and / or pulsating pressure loads, as may occur in the cooling system, when the system pressure frequently changes compared with the cooling jacket, which is separately pressed in according to the first variant of the invention and tightened around the motor.

According to an optional invention training so the cooling jacket and / or heat exchanger both the

Inner wall as well as the outer wall on their respective outer sides with several alternating elevations and

Recesses formed. Preferably, the two-sided Elevations with respect to a connecting the joints or joining sections center line of the flow cavity run symmetrically.

According to an optional invention training so the cooling jacket and / or heat exchanger is covered by a cover and / or spanned. Suitably, the cover with steel sheet and / or with a higher wall thickness than that of the inner or

Outside wall of the cooling jacket and / or heat exchanger made.

According to an optional invention training, the cooling jacket and / or heat exchanger is characterized by a structural integration with the cover in the manner of a

Shrink bandage off.

According to an optional invention training protrude at the cooling jacket or heat exchanger, the inlet and outlet means for cooling medium projecting through passages, which are formed in the wall of the cover shell.

According to an optional embodiment of the method according to the invention, the two heat conducting plates in the flat state or just, possibly congruent, superposed and welded at their edges or otherwise connected to form the solid composite.

According to an optional embodiment of the method according to the invention, individual joints or sections are formed to form the solid composite through its outer side (s) and / or outer shell, whereby opposite inner sides of the inner and outer walls are connected to one another. It is expedient to attach the individual joints or sections by means of welding through the inner or outer wall. The joints or - sections are produced by means of point, circle and / or line welding on the outside of the inner or outer wall.

According to an optional embodiment of the method according to the invention, the solid composite is adapted by means of deformation to the outer contour (s) of a product to be cooled to the cooling jacket or heat exchanger with the outside of its outer or inner wall in a whopping plant as possible to be cooled To bring the product.

According to an optional embodiment of the method according to the invention is still shallow for forming

Plate composite plastically deformed by means of a forming device or a support body whose outer contour corresponds to the product to be cooled. Suitably, the still flat plate composite is bent to form a cylindrical shape for forming or it is bent around a core or a support body to a cylindrical shape and connected to it opposite and / or abutting edges. In particular, the plate composite can be held with the outside of its outer or inner wall by means of fixing in contact with the forming device or the support body. Furthermore, optionally the plate composite to his

Fixing in the area of welding or other joints to the support body or the forming device to be pressed. In particular, this pressing is carried out before the specified in claim 22 step b).

According to an optional embodiment of the method according to the invention, the hydroforming is carried out by introducing a pressure medium such as compressed air or water between the inner and outer walls.

According to an optional embodiment of the method according to the invention, the use of a Forming device for forming the solid plate composite assumed, to form the solid composite on its outer side (s) and / or its outer jacket individual joints or sections are attached, whereby opposite inner sides or inner flats of the inner and outer walls are connected together. During the hydroforming stage, hold-downs are brought into abutment with the outer surface (s) or the outer shell of the outer wall in the region of the joints or sections and / or in the region of a peripheral seam or a welded peripheral edge in order to bond with the outside of its outer - or

Inner wall to hold in contact with the forming device.

According to an optional embodiment of the method according to the invention, the outside of the outer or inner wall with a coating of viscoelastic polymer, casting and / or impregnating resin and / or another, the

Provided heat transfer improving laminate. Appropriately, the cooling jacket and / or heat exchanger is used for a impregnated with casting and / or impregnating stator of a housing-less electric machine. The formed plate composite is brought with its inner wall in abutment against the stator, as long as the

Casting and / or impregnating resin is not completely cured. Suitably, the stator is soaked in the region of its outer edge or outer circumference with casting and / or impregnating resin. In particular, an assembly of the cooling jacket on a solid product to be cooled is carried out prior to impregnation.

According to an optional invention training in the cooling arrangement, the inner wall is alone with their protruding elevations in heat transferring contact with the outer shell or the outer wall of the stator.

[0049] According to an optional invention training in the

Cooling arrangement is a coating with preferably plastic deformable heat conduction between the outside of the inner wall and the outer contour of the product to be cooled.

According to an optional invention education in the cooling arrangement, wherein stator windings of the electrical machine are potted or impregnated with a potting or impregnating, the Verguss- or Tränkmasse is also between the outer side or the concave outer shell of the inner wall and the outer shell of the Stators or stator housing.

For both variants of the invention mentioned electric motors and generators, preferably in caseless, vollgeblechter execution, as well as cooling or heating containers or reactors are suitable applications. In particular torque motors are suitable as cooling objects for the invention.

Further details, features,

Features combinations, effects and advantages of the invention will become apparent from the following description of exemplary embodiments of the invention and from the drawings. These show in:

Figure 1 in a schematic cross-sectional view the

Basic structure of a cooling jacket according to the invention

Figure 2 is a plan view of a still flat cooling jacket according to the invention

FIG. 3 is a perspective view of the cooling jacket already partly shaped on an inner tubular core,

FIG. 4 is a perspective view of the slightly wavy outer jacket of the cooling jacket outer wall; Figure 5 shows the over a cooled stator to be cooled by an electric motor, finished cooling jacket, and

Figure 6 shows the basic structure of a second variant of the cooling jacket according to the invention in a figure 1 corresponding cross-sectional view.

According to Figure 1, the cooling jacket according to the invention has an inner wall 1 and an outer wall 2, which are arranged concentrically or coaxially to each other and connected via individual, for example, circular welds 3 selectively or at discrete locations. Relative to the circular cylindrical course of the inner wall 1, the outer wall 2 extends wavy or with partially outwardly radially offset contour and inwardly the outer shell of the inner wall 1 in the welds 3 tangent. Thus arise for the outer wall 2 on its outer surface in the region of the welds 3 valleys or depressions 4, where between radially outwardly offset elevations 5 extend in convexly curved shape. As indicated by dashed lines in accordance with the axial end view of Figure 1, welds 3, 3a are arranged offset to one another in both axially parallel and in the circumferential direction, so that in the view of Figure 1 located behind a (visible) survey 5 (actually not visible and therefore only dashed lines indicated) welds 3a corresponding further

Form recesses 4a. Overall, change on the outer surface of the outer wall 2 along a common, paraxial (perpendicular to the plane) escape recesses 4 with elevations 5a preferably uniformly. Between a convexly outwardly arched elevation 5 of the outer wall 2 and the inner wall 1 passages 6 for so far axially parallel flowing cooling fluid or cooling medium remain. The latter flows axially parallel until it along the axis-parallel escape to a (rear) connection or Welding point 3a abuts, so that the cooling fluid flow divides into a part in each of the adjacent flow passages 6, which define the (rear) weld 3a between them. As a result, the partially paraxial progressions of the coolant flow at the welds 3, 3a interruptions impressed, resulting in meandering evasive courses and associated whirls, which increases the cooling efficiency.

According to Figure 2, two Wärmeleitplatten 7, for example, flat sheet metal parts, flush and congruent in the planar state over each other are laid to form a double-walled cooling jacket, resulting in a later manufacturing step, the inner and outer walls 1, 2 of the cooling jacket. However, it is not mandatory that the upper and lower parts are congruent. In the plan view of FIG. 2, only the upper one of the preferably identically designed heat-conducting plates 7 is visible. At their edges 8, 8a, 14 (in accordance with illustrated, elongated rectangular basic shape four individual side edges), the two sheet-metal heat conducting plates 7 are welded together around. In addition, a meandering flow channel structure for the cooling medium and / or an offset, localized stapling of the sheet heat conducting plates 7 are produced by the welding process.

According to the embodiment of Figure 2 are in the longitudinal direction of the two superimposed heat conducting plates 7 more, approximately parallel juxtaposed rows I - V each with individual, along the respective escape arranged one behind the other

Welds 3, 3a formed. These are, for example, circular or otherwise rounded and connect in places, the two superimposed heat conducting plates 7, so that at their opposite inner flat sides corresponding joints arise. These are in the finished state of the cooling jacket

(see Figure 4) the coolant flow as an insurmountable obstacle against and must be flowed around by this each. The welds 3, 3a in each case two adjacent rows I, II; II, III ... are offset in the longitudinal direction against each other, wherein welds 3, 3a of two not immediately adjacent to each other extending rows II, IV over a common, free transverse flight 9 (transverse to the plate longitudinal direction) directly opposite each other. By the offset of the welds 3, 3a in the longitudinal direction of the heat conducting plates 7 and in the finished state according to Figures 4 and 5 in the circumferential direction a repeatedly repeated deflection and thus a meandering course of the coolant flow is conveyed from an inlet to an outlet.

The same applies according to Figure 2 for elongated, in the example shown linearly extending welding sections or - seams 10. These each proceed from a weld 3, 3a, which seen in the longitudinal direction of the heat conducting plates 7 alternately in

Area of the one longitudinal side edge 8 and the other, opposite longitudinal side edge 8a, while offset in the longitudinal direction of the plate, are placed. In other words, the elongated joining portions 10 are offset in the longitudinal direction (and thus in the finished state in the circumferential direction) alternately more towards the one edge 8 and towards the opposite other edge 8a.

The length of the elongated joining portions 10 is dimensioned so that they transversely transversely to the plate longitudinal direction (in the finished state according to Figure 4 paraxial) two rows I, Il or IV, V in the longitudinal direction of successive welds 3, 3a transversely prevail. In this case, the elongated welding sections 10 each depart from welds of a row I, V or escape, which lie closest to the two longitudinal side edges 8, 8a. They each extend between two welds 3, which follow one another directly in their respective common row II, IV, wherein the respective row or flight II, IV one of the outermost rows I, V is closest. Suitably, the elongated welding sections 10 end in alignment with a central row III with welds 3a.

According to Figure 2 and there embodiment also fixing holes 11 are still formed, which pass through the superposed heat conducting plates. As well as the welds

3, 3a and the welding portions 10, the fixing holes 11 are arranged at regular intervals from each other, thus for the

Outer jacket of the outer wall a regular and tightly corrugated

Structure is buildable. In particular, in a series production, it may be appropriate, in addition to or instead of Fixierbohrungen

Use hold-down device.

After completion according to Figure 2, the resulting sheet sandwich is then bent to a cylinder jacket for a product to be cooled 19 and fixed in accordance with Figure 3 by means of fixing screws 12 which are complementary to the Fixierbohrungen 11 on a hollow cylindrical core 13. According to FIG. 3, the two transverse edges 14 of the sheet-metal sandwich are fixed to the outer jacket of the metallic core 13 by means of assembly welds 15, which can be removed again in a later production step. In particular, in a mass production, it may be appropriate to use in addition to or instead of mounting welds hold-down. The outer wall 2 visible only in FIG. 2 is penetrated by a pressure line 16, for example an inflation pipe, so that a pressurized fluid, for example compressed air, flows into the flow cavity 17 (not fully formed according to FIG. 3)

(see Figure 1) can be passed.

According to Figure 4 is now on the pressure line 16 (see

3) by means of the pressurized fluid, the area between the two

Heat conducting plates 7 and the inner and outer walls 1, 2 have been exposed to an internal pressure of certain height, so that this area plastically expanded or expanded to the flow cavity 17 has been. The meandering structure produced by means of the abovementioned welding process is widened or opened to the flow cavity 17, so that a cooling fluid can flow in snake-like fashion between the two heat-conducting plates 7 or the inner and outer walls 1, 2 and between the welds 3, 3a.

The production by means of holes and fixing screws is useful for small numbers or for the production of a functional pattern. In a series production, hold-downs should instead be more practicable. Then also the above-mentioned holes could be omitted within the circular welds.

On the other hand, the holes could be maintained with a correspondingly small diameter for a better penetration of the impregnating resin.

By means of the fixing screws 12, the cooling jacket is attached to the Umformkern 13 such that during the hydroforming

Reshaping the (not visible in Figures 3 and 4) inner wall 1 and the corresponding inner heat-conducting 7 can not escape and receives on her after the Umformkern 13 outside a largely smooth outer surface for rich or dense contact with the object to be cooled 19. The opposite is reflected in the

Outer wall 2 according to Figure 4, already explained with reference to Figure 1 wave structure with depressions 4, 4a on the outer shell in the welds 3, 3a and also the fixing holes / screws 11, 12 and with the elevations 5, 5a therebetween. Alternatively or in addition to the fixing holes 11 with

Fixing screws 12 are useful support means, for example in the form of known in forming hold-downs, which the outer shell of the outer wall 2 each locally limited to the area of the welds 3, 3a and optionally also the weld sections 10 and / or the circumferential weld targeted during inflation support inside the cooling jacket. there can form a slightly curved or wave-like structure in the outer wall 2, while the directed towards the inside of the cooling object outside of the inner wall 1 remains smooth due to the investment in the Umformkern 13 with its smooth outer shell. This allows a particularly good heat transfer between the outside of the object to be cooled, for example, the surface of an electric motor, and the inner jacket of the cooling jacket. It when the hold-down or other support means are aligned so that the cooling jacket is pressed with its inner wall 1 as perpendicular as possible or directly to the surface of the Umformkerns is particularly advantageous.

In a further production step according to FIG. 5, the cooling jacket thus produced is provided with inlet and outlet means 18, for example connecting pieces, which are preferably welded directly to the outer wall 2 in the area of the connecting bore of the cooling jacket passing through the outer wall 2. This is expediently carried out in an edge and / or corner region of the cylindrically bent cooling jacket sheet sandwich. Whose when bending almost abutting, close opposite transverse edges 14 (see also Figure 2) are to the cooling jacket to the

Stator 19 to tension with (not shown) elastic tensioning means such. Spring clips or the same held together.

According to FIG. 6, in the case of the cylindrical cooling jacket designed according to a second variant of the invention, not only the outer wall 2 with recesses 4 which alternate in the circumferential direction,

4a and elevations 5, 5a, but also analogous to the inner wall 1 with circumferentially alternating depressions 44, 44a and elevations 55, 55a designed. This corrugated on both sides of the cooling jacket structure is approximately symmetrical to an imaginary in the flow cavity 17 middle or

Connecting line M for the individual welds 3, 3a, over which the Inner and outer walls 1, 2 of the cooling jacket are stapled together. The indentations 4, 4a, 44, 44a, which are bounded by adjacent elevations 5, 5a, 55, 55a, result from the individual welds 3, 3a (in this respect similar to the embodiment according to FIG. 1). In deviation from the

Invention variant according to Figures 1 to 5, the flow cavity 17 is shown in Figure 6 with its pillow or meander-like structure by inflation and hydroforming between an outer cover 22 and the inner cooling object, for example, stator 19 of an electric motor, pressed and expanded. This results in analogous to Figure 1, flow paths between each individual welds 3, 3a. When pressing it comes to a rich investment of the inner wall 1 of the cooling jacket with its inner wall elevations 55,55a to the outer surface of the object to be cooled, for example, rotor 19. The same applies to the

Elevations 5,5a of the outer shell 2, which rests on this from the inside to the cylindrical cover 22. During the process of hydroforming the inner and outer walls 1, 2 of the cooling jacket between cover 22 and, for example, rotor 19, which are adhered together via welds 3, 3a, elastic and / or elastic-plastic deformation of cover shell 22 also occurs. whereupon this reacts with the exertion of a radial counter-pressure inwards on the cooling jacket or its outer wall 2. As a result, the cooling jacket is pressed all the more firmly against the object to be cooled, for example stator 19. The elastic-plastic

Deformation of the cover shell 22 is also manifested on its outer surface by alternating depressions 224 and elevations 225, which are approximately congruent with the depressions 4, 4a and elevations 5, 5a of the outer jacket of the cooling jacket.

Reference numeral list

inner wall 2 outer wall

3,3a welds

4,4a, 44,44a recess

5,5a, 55,55a survey

6 passage

7 heat conducting plate

8 edges, four margins

8a opposite edge

I-V rows or flight

9 cross flight

10 elongated welding section

11 fixing hole

12 fixing screw

13 forming core

14 transverse edge

15 assembly welds

16 pressure line

17 flow cavity

18 inlet and outlet means

19 stator

20 stator winding

21 fugue

22 cover coat

224 Covering recess

225 cover coat elevation

M midline

M \ MANDANTENA-Z \ MAND ANTEN B \ 0002 B \ UMULLER \ 194TWO ENROLLMENT MT DOC

Claims

claims

1. Cooling jacket and / or heat exchanger for contact with solid products to be cooled, in particular to electrical machines with inside or outside a stator (19) rotating rotor or reactors or containers, with an inner and outer wall (1, 2), which between them a flow cavity (17) bounded with inlet and outlet means (18) for cooling medium and guide means for forming and / or limiting at least one flow path for the cooling medium between the inner and outer walls (1, 2) of the inlet and Outlet means (18) is provided, wherein facing individual flats or flat portions of the inner and outer walls (1, 2) abut each other within their edges, and between the adjacent flats or flat portions

Passages (6) for the cooling medium remain, and on one or more outer sides or an outer shell of the inner and / or outer wall (2) one or more elevations (5,5a) and depressions (4,4a) alternate, characterized in that the adjoining flat areas or flat sections are permanently connected via individual joints (3, 3 a) and / or elongated joint sections (10).

2. Cooling jacket according to claim 1, characterized in that the elevations (5,5a) and depressions (4,4a) are convex or concave.

3. cooling jacket and / or heat exchanger according to claim 1 or 2, characterized in that the joints (3,3a) and / or - sections (10) with stitching or welding, soldering,

Gluing, folding, clinching, screwing and / or riveting are realized.

4. cooling jacket and / or heat exchanger according to one of the preceding claims, characterized in that the joints (3,3a) and / or joining portions (10) in the region of the recesses (4,4a) of the respective outer side of the inner or outer wall (2 ) are arranged.

5. cooling jacket and / or heat exchanger according to one of the preceding claims, characterized in that the recesses (2) and / or flow-conducting means with the joints (3,3a) and / or joining sections (10) are realized.

6. cooling jacket and / or heat exchanger according to one of the preceding claims, with a cylindrical and / or elongated and / or rotationally symmetrical basic shape, characterized in that - seen in a flight (9) parallel or according to the cylinder, longitudinal or symmetry axis - on the outer surface or side of the inner or outer wall (2) elevations (5,5a) alternate with recesses (4,4a), each elevation (5,5a) or recess (4,4a) on each side from the outside Escape (9) located depressions (4,4a) or elevations (5,5a) is limited.

7. cooling jacket and / or heat exchanger according to one of the preceding claims, characterized in that the flow-conducting means with the joints (3,3a) and / or

Joining sections (10) and / or connecting points or sections between the inner and outer walls (1, 2) are realized.

8. cooling jacket and / or heat exchanger according to one of the preceding claims, characterized by an arrangement of the joints (3,3a) and / or joining portions (10) such that the or the flow paths of the cooling medium meander and / or run through turbulence.

9. cooling jacket and / or heat exchanger according to one of the preceding claims, with a cylindrical and / or elongated and / or rotationally symmetrical basic shape, characterized in that in a Umfangsechtung (I - V) to the

Cylinder, longitudinal and / or symmetry axis a plurality of elongated joining portions (10) of the inner and outer walls (1, 2) are offset alternately more towards a rim (8) and more towards an opposite edge (8a).

10. Cooling jacket and / or heat exchanger according to one of the preceding claims, having a cylindrical and / or elongated and / or rotationally symmetrical basic shape, characterized in that in a Umfangsechtung (I - V) to the cylinder, longitudinal and / or axis of symmetry and / or in one

Direction (9) parallel to the cylinder, longitudinal and / or symmetry axis a plurality of joints (3,3a) and / or joining sections (10) are arranged offset from one another.

11. Cooling jacket and / or heat exchanger according to one of the preceding claims, characterized in that the joints (3,3a) and / or joining portions (10) are arranged with regular structure and / or uniform distances from each other.

12. cooling jacket and / or heat exchanger according to one of the preceding claims, characterized by mounting and / or fixing means (11, 12) on or in the outer and / or inner wall (2.1) for attachment to a forming device (13).

13. Cooling jacket and / or heat exchanger according to one of the preceding claims, characterized in that the Inner and / or outer walls (1, 2) with sheet metal parts of a thickness of 0.3 to 2.00 mm, for example, 0.8 mm, are realized.

14. Cooling jacket and / or heat exchanger according to one of the preceding claims, having a hollow cylindrical basic shape, wherein the cylinder circumferential jacket has an axially parallel butt seam or joint (21), which by circumferentially (I - V) opposite edges (14) of the inner and outer wall (1, 2) is formed, characterized in that the opposite edges (14) by spring clips, claw springs or other elastic clamping means and / or welds (15) are held together or directly opposite one another.

15. Cooling jacket and / or heat exchanger according to one of the preceding claims, characterized in that the

Outer or inner wall (1) is formed with a smooth or largely smoothed outside for full contact with the solid product.

16. Cooling jacket and / or heat exchanger according to one of claims 1 to 14, characterized in that both the inner wall (1) and the outer wall (2) on their respective outer sides with a plurality of alternating elevations (5,5a, 55.55a) and Recesses (4,4a; 44,44a) are formed,

17. cooling jacket and / or heat exchanger according to claim 16, characterized in that the two-sided elevations (5,5a; 55,55a) and / or depressions (4,4a, 44,44a) with respect to a one of the joints

(3,3a) or joining sections (10) connecting the center line of the flow cavity are symmetrical.

18. Cooling jacket and / or heat exchanger according to claim 17, characterized in that it comprises a cover (22) and / or is spanned.

19, cooling jacket and / or heat exchanger according to claim 18, characterized in that the cover (22) is made with steel sheet and / or with a higher wall thickness than that of the inner or outer wall (1, 2) of the cooling jacket and / or heat exchanger ,

20. Cooling jacket and / or heat exchanger according to claim 18 or 19, characterized by a structural integration with the cover (22) in the manner of a shrinkage association.

21. Cooling jacket and / or heat exchanger according to one of the preceding claims, characterized in that the inlet and outlet means (18) protrude for cooling medium projecting through passages which are formed in the wall of the cover shell (22).

22. A method for producing a cooling jacket and / or

Heat exchanger having an inner and an outer wall (1, 2) and a flow path therebetween for cooling medium, formed according to any one of claims 1-14, comprising the following steps:

a) forming a solid composite of two individual flat sheet metal, metal or other Wärmeleitplatten (7) as inner and outer walls (1, 2) by being placed against each other, at their respective edges and within the same via individual joints (3 3a) and / or one or more oblong ones

Joining sections (10) permanently connected b) after the step a) generating a flow cavity (17) by hydroforming between the inner and outer walls (1.2)

c) after step a) or b) attaching inputs and / or

Coolant outlet means (18) directed to the flow cavity (17) within the composite.

23. The method according to claim 22, characterized in that for forming the solid composite, the two heat conducting plates (7) in

Flat state or even, possibly congruent, superimposed and welded at their edges (14) or otherwise connected.

24. The method according to claim 22 or 23, characterized in that for forming the solid composite through its outer side (s) and / or its outer jacket through individual joints (3,3a) or sections (10) are formed, whereby opposite inner sides of Inner and outer walls (1, 2) are interconnected.

25. The method according to claim 24, characterized in that the attachment of the individual joints (3,3a) or sections (10) by means of welding through the inner or outer wall (1, 2).

26. The method according to any one of claims 24 or 25, characterized in that the joints (3,3a) or sections (10) by means of point, circle and / or line welding on the outside of the inner or outer wall (1, 2 ) be generated.

27. The method according to any one of the preceding claims, characterized in that the solid composite by means of deformation of the Outer contour (s) of a product to be cooled (19) is adapted to bring the cooling jacket or heat exchanger with the outside of its outer or inner wall (1) in the most intimate contact with the product (19).

28. The method according to claim 27, characterized in that for forming the still flat plate composite (1, 2, 7) by means of a forming device (13) or a support body is plastically deformed, the outer contour of which corresponds to the product to be cooled (19) ,

29. The method according to claim 27 or 28, characterized in that for forming the still flat plate assembly (1, 2, 7) is bent into a cylindrical shape or bent around a Umformkern (13) or a support body to a cylindrical shape and to thereby opposite and / or abutting edges (14) is connected.

30. The method according to any one of claims 28 or 29, characterized in that the plate composite (1, 2, 7) with the

Outside of its outer or inner wall (1) by means of fixing means (11, 12) is held in contact with the forming device (13) or the support body.

31. The method according to any one of claims 27 to 30, characterized in that the plate composite (1, 2, 7) for its fixing in the region of the welding or other joints (3,3a) to the support body or the forming device (13 ) is pressed.

32. The method according to claim 31, characterized in that this

Pressing before step b) takes place.

33. The method according to any one of the preceding claims, characterized in that the hydroforming by means of introducing a pressure medium such as compressed air or water between the inner and outer walls (1, 2).

34. The method according to one of the preceding claims, using a forming device (13) for forming the fixed plate composite (1, 2, 7), wherein for forming the solid composite on its outer side (s) and / or its outer jacket individual joints (3 , 3a) or sections (10) are attached, whereby opposite inner sides or inner surfaces of the inner and outer walls (1, 2) are interconnected, characterized in that during the phase of hydroforming down device to the outside (s) or the outer jacket of the outer wall (2) in

Area of the joints (3,3a) or sections (10) and / or in the region of a peripheral seam or a welded peripheral edge are brought into abutment with the outside of its outer or inner wall (1 ) in abutment with the forming device (13).

35. The method according to any one of the preceding claims, characterized in that the outer side of the outer or inner wall (1) is provided with a coating of viscoelastic polymer, casting and / or impregnating resin and / or another, the heat transfer improving laminate.

36. The method according to claim 35, wherein the cooling jacket and / or heat exchanger is used for a casting and / or impregnating resin impregnated stator (19) of a caseless electric machine, characterized in that the formed plate composite (1, 2; its inner wall (1) in contact with the Stator (19) is brought, as long as the casting and / or impregnating resin is not fully cured.

37. The method according to claim 36, characterized in that the stator (19) in the region of its outer edge or outer circumference with

Casting and / or impregnating resin is soaked.

38. The method of claim 36 or 37, characterized in that prior to impregnation, a mounting of the cooling jacket is performed on a solid product to be cooled.

39. Cooling arrangement with an electric machine or with a reactor or container, characterized by an enclosure or enclosure of the electrical machine or its stator (19), the reactor or the container with the inner wall (1) in one of claims 1 to 38 defined cooling jacket and / or heat exchanger.

40. Cooling arrangement according to claim 39, characterized in that the inner wall (1) of the cooling jacket alone with its protruding

Elevations (55,55a) in heat transfer contact with the outer shell or the outer wall of the stator (19).

41. Arrangement according to claim 39 or 40, characterized by the

Arrangement of a coating with preferably plastically deformable heat conducting means between the outside of the inner wall (1) and the outer contour of the product to be cooled (19).

42. Arrangement according to claim 39, 40 or 41, wherein stator windings

(20) of the electrical machine are potted or impregnated with a casting or impregnating mass, characterized in that the casting or impregnating mass is also located between the outer side or the concave outer casing of the inner wall (1) and the outer casing of the stator (19) or stator housing.

M \ MANDANTENA-Z \ MANDANTEN B \ 0002 BAUMULLER \ 394TWO AMT DOC