Pump with electric drive, coolant circuit and vehicle

Abstract

The invention relates to a pump (100) for conveying a liquid from a suction side (101) to a pressure side (102) of the pump (100), the pump (100) having an electric drive with a stator (110) and a rotor (120) mechanically connected to a conveying means (125), at least one heat-conducting element (140, 145) being arranged at least along a surface of the stator (110), the heat-conducting element is designed to absorb heat from at least one further component of the stator (110) and / or of the pump (100), in particular a power electronics (130) for energizing the stator, and to dissipate the heat to the liquid conveyed by the pump (100).

Description

Technical Field

[0001] The present invention relates to a pump having an electric drive, a coolant circuit having such a pump, and a vehicle. Background Technology

[0002] In partially electric vehicles (such as hybrid vehicles) and fully electric vehicles, electrically driven cooling water pumps can be used. Depending on the system configuration, multiple pumps with different flow rate and temperature presets can be installed for different cooling circuits. Simultaneously, the pumps should be as small as possible while still being able to achieve a large flow rate. However, this leads to the problem of inefficient waste heat dissipation in a small structural space at high power levels, as pump efficiency typically deteriorates significantly, especially at high flow rates. Because the pumps are partially installed in this way, cooling of the electronics (circuit boards) and / or stator through the pump casing is insufficient, so additional, more expensive (active) cooling measures may be necessary. Summary of the Invention

[0003] According to the invention, a pump having an electrically driven device, a coolant circuit having such a pump, and a vehicle are proposed, having the features of the independent claims. Advantageous designs are the subject of the dependent claims and the following description.

[0004] This invention provides a pump with an electrically driven device for conveying liquid from the pump's suction side to the pressure side. The electrically driven device has a stator and a rotor, the rotor being mechanically connected to or part of a conveying mechanism. At least one heat-conducting element is arranged at least along a surface of the stator, the heat-conducting element being configured to absorb heat from the stator and / or from at least one other component of the pump, particularly from power electronics energizing the stator, and dissipate it to the liquid conveyed by the pump. Thus, heat generated by electrical losses through the stator or at least one other component is effectively dissipated without providing separate cooling. Furthermore, leakage flows ("hydraulic short circuits") that return from the pump's pressure side to the suction side, conventionally intended for cooling the stator, can be reduced or preferably completely eliminated without compromising the cooling of the stator or other components. Therefore, efficiency is significantly improved compared to conventional pumps. For example, in conventional pumps, these (specifically planned) leakage flows can be up to 30% of the volume of liquid conveyed, while these leakage flows are reduced or eliminated entirely in the design of this invention. Furthermore, by dissipating heat into the liquid being transported, the following advantages arise: even under high transport power and thus high heat load conditions, the high cooling power generated by the high volumetric flow rate of the transported medium for cooling can also be utilized. In particular, the pump housing, which is traditionally designed for heat dissipation at high cost, can be designed more economically without sacrificing effective heat dissipation, and the pump can be arranged, installed, and operated without being dependent on external installation conditions, such as in a vehicle.

[0005] According to at least one design, the stator, together with at least one thermally conductive element, is at least partially embedded in an electrically insulating solid material, for example, by injection molding. According to at least one design, the electrically insulating solid material here has a higher thermal conductivity than air. According to at least one design, the electrically insulating solid material comprises one or more materials from the group consisting of thermoplastic plastics, thermosetting plastics, and ceramic materials. Therefore, for example, the stator can be cast into a plastic matrix together with at least one thermally conductive element, which particularly advantageously affects the electrical and thermal properties. In particular, this also allows for the separation of the wet and dry chambers without additional components (without additional seals) and simultaneously optimizes heat transfer between the stator and the thermally conductive element, since the insulating air layer is replaced by a plastic capable of achieving more efficient heat transfer.

[0006] According to at least one design scheme, at least one heat-conducting element is in thermal contact with the pressure side of the pump or the fluid passage on the pressure side. This allows for better utilization of the structural features without increasing the pump's structural space. Cooling power is generated, as already mentioned, through heat dissipation in the fluid passage on the pressure side. This cooling power increases with increasing delivery power (and thus with increasing pump thermal power) and is therefore automatically adapted to demand.

[0007] According to at least one design, at least one heat-conducting element is arranged at least partially on the surface of the defined wet chamber of the pump and / or on the stator's surface facing away from the rotor (i.e., the "outer surface"). Depending on the specific design, this allows for various advantages. For example, for a heat-conducting element arranged on the outer surface of the stator, a particularly small gap between the rotor and stator can be achieved. Here, a thin extrusion encapsulation (e.g., a layer as thin as possible of electrically insulating solid material) arranged between the rotor and stator ensures the sealing of the liquid medium (wet chamber) relative to the stator. This allows for particularly effective heat dissipation in areas that are spatially inaccessible to other forms of heat dissipation (e.g., radiation, convection, etc.). Furthermore, such a thin extrusion encapsulation with small wall thickness arranged between the stator and rotor, along with a complete stator extrusion encapsulation (especially including the rotor pin), contributes to achieving particularly small manufacturing tolerances, as the plastic extrusion encapsulation in this area anticipates less expansion and twisting, and the appropriate material selection allows for smooth and / or precise surfaces and thus smaller safety calibrations.

[0008] According to at least one design, the stator is arranged in the dry chamber of the pump and the rotor is arranged in the wet chamber, wherein the dry chamber is not penetrated by liquid and the wet chamber is at least partially (e.g., temporarily and / or in the space portion of the wet chamber) penetrated by liquid. The arrangement of the stator in the dry chamber provides higher electrical safety because there is no need to worry about short circuits caused by the pumped liquid in the event of defects in the insulation of the stator windings.

[0009] According to at least one design scheme, at least one thermally conductive element has an enlarged surface structure, and more precisely, at least in the region constructed for transferring heat from the stator (especially through an electrically insulating solid material) to at least one thermally conductive element and / or in the region constructed for transferring heat from at least one thermally conductive element (especially through an electrically insulating solid material) to the liquid and / or, if so, in the region constructed for transferring heat from at least one other component to at least one thermally conductive element. Thus, heat transfer can be designed particularly effectively and, especially, can be adjusted as needed, by using materials that conduct heat particularly well in areas where particularly intense exothermic activity is anticipated, such as aluminum, to transfer heat to the pump impeller and by means of a particularly effective surface structure to a plastic extrusion encapsulation (a conductive solid material) that tends to conduct heat poorly. Furthermore, with such an enlarged surface structure, mechanical stress, for example, due to different coefficients of thermal expansion, can be minimized. Suitable enlarged surface structures include, for example, uneven areas, corrugations, ribs, pyramids, cuboids, etc.

[0010] According to at least one design, at least one thermally conductive element has at least one bent part and / or at least one deep-drawn part and / or at least one sheet metal part and / or at least one die-cast part. This is a particularly low-cost and technically undemanding option, although these options can achieve sufficiently precise manufacturing.

[0011] According to at least one design scheme, at least one thermally conductive element has at least one metal, particularly one or more from the group consisting of aluminum, iron, and copper, and their alloys. These materials are particularly suitable for this application due to their good availability, processability, and thermal properties.

[0012] According to at least one design, at least one heat-conducting element has a housing for receiving the stator and, for example, has a can shape or a hollow cylindrical shape. The base surface of the housing can have an opening. The opening can include the entire base surface or only a part of the base surface. The side facing the base surface (the upper side) can also have a complete or partial opening. Such a housing can be provided very easily in the design and form a large surface area. The stator can then be easily installed into such a housing.

[0013] According to at least one design, at least one thermally conductive element has a cover that at least partially closes an opening in the housing, such as on the upper side. This allows for further expansion of the surface area of ​​at least one thermally conductive element.

[0014] According to at least one design, the cover of at least one thermally conductive element that at least partially closes the opening in the housing is not embedded in the electrically insulating solid material together with the housing. This simplifies the embedding process due to better accessibility. However, it is possible to later arrange the cover of at least one thermally conductive element that at least partially closes the opening in the housing onto the housing embedded in the electrically insulating solid material, thereby at least partially closing the opening in the housing.

[0015] According to at least one design, the shaft carrying the rotor, such as a pin, is at least partially embedded in an electrically insulating solid material along with the stator and at least one thermally conductive element. This allows the shaft to be oriented very precisely relative to the stator. The rotor can then be rotatably supported on the shaft by means of bearings.

[0016] The coolant circuit according to the invention has at least one pump according to the invention, wherein the at least one pump is configured to deliver coolant in the coolant circuit. Thus, the coolant circuit enjoys the advantages described with respect to the pump itself in a manner corresponding to its meaning.

[0017] Vehicles according to the invention, especially those that are at least partially electrically driven, have a coolant circuit according to the invention and / or at least one pump according to the invention, and thus also enjoy its advantages.

[0018] Further advantages and design solutions of the present invention will become apparent from the specification and drawings. Attached Figure Description

[0019] The present invention is schematically illustrated in the accompanying drawings with reference to embodiments, and is described below with reference to the drawings.

[0020] Figure 1 A schematic diagram shows a longitudinal section of a pump according to one design of the present invention.

[0021] Figure 2 The diagram illustrates the situation in... Figure 1 Another longitudinal section of the pump is shown (but without the hydraulic unit cover).

[0022] Figure 3 A schematic diagram is shown from the dry side. Figure 1 and 2 A perspective top view of the pump components.

[0023] Figure 4 A schematic diagram is shown from the wet side. Figure 1 and 2 A perspective top view of the pump components.

[0024] Figure 5 A perspective view of a stator that can be used as described in the design of the present invention is shown.

[0025] Figure 6A and 6B Different designs of the same heat-conducting element that can be used according to the design scheme of the present invention and their arrangement relative to the stator are shown. Detailed Implementation

[0026] exist Figure 1 and 2 The pumps according to one design of the invention are schematically shown in longitudinal sections and are generally represented by 100. Figure 3 and 4 The components of the pump 100 are schematically shown from the dry or wet side using a perspective top view.

[0027] Pump 100 has an electric drive unit having a stator 110 and a rotor 120. In the example shown here, the electric drive unit is a motor energized by permanent magnets, such that the rotor 120 here has permanent magnets that apply torque to a delivery mechanism 125 based on the magnetic field formed by the stator 110. The delivery mechanism 125 is configured to draw in liquid, such as a water-based coolant, from the suction side 101 and deliver it to the pressure side 102. In the example shown here, the delivery mechanism 125 is configured as the impeller of a rotary pump.

[0028] The stator 110 is arranged in the dry chamber 104 of the pump 100 and the rotor 120 is arranged in the wet chamber 103 of the pump 100, wherein the dry chamber 104 is not flushed by liquid and the wet chamber 103 is at least partially flushed by liquid.

[0029] The stator 110 that can be used within the scope of the design of this invention is Figure 5 The stator is schematically shown in the diagram. It has, for example, a stator winding 111 made of enameled wire and a stator core 112, for example, a lamination assembly made of soft iron sheets electrically insulated from each other. The stator winding 111 may be provided with push-in pins 113 for contact via a power electronics 130 energized to the stator 110.

[0030] As in Figure 1 and 2As shown, the stator 110 is electrically connected to and energized by a power electronics device 130, which is another component of the pump 100. In the example shown here, this power electronics device 130 is mounted on a circuit board arranged at the axial end of the pump 100 (relative to the axis of rotation of the rotor 120) and protected by a housing cover 160 to prevent external influences such as dust and / or moisture. In the example shown, an electrical contact interface 132 in the form of a contact fork is also integrated into the housing cover 160, which can be energized from the outside via a plug contact 162.

[0031] Rotor 120 operates on shaft 170, which is mechanically fixed relative to stator 110. In the example shown here, stator 110 is embedded in an electrically insulating solid material 150, such as a thermoplastic, which also supports shaft 70 and is thus fixed relative to stator 110. The electrically insulating solid material 150, in the example shown here, is molded to create a fixing portion 158, which, in conjunction with a corresponding fixing element 180, serves to secure hydraulic unit cover 190 to the axial end of pump 100 opposite housing cover 160. For this purpose, hydraulic unit cover 190 also has a corresponding fixing portion 198. Fixing elements 180 may include, for example, screws, pins, rivets, etc. The electrically insulating solid material 150 forms surfaces 151, 152 or partitions separating wet chamber 103 and dry chamber 104.

[0032] To dissipate heat generated during the operation of pump 100, particularly in stator 110 and / or power electronics 130, through electrical losses, two heat-conducting elements 140, 145 are provided here, arranged at least along the surface of stator 110. These heat-conducting elements 140, 145 can, for example, be cast together with stator 110 and shaft 170 into electrically insulating solid material 150.

[0033] The heat-conducting elements 140 and 145 are currently configured as a housing or stator housing 140 and housing cover 145, which receive the stator 110. For this purpose, the stator housing 140 has the shape of a can or hollow cylinder, having an opening in its base surface and a fully open upper side into which the housing cover 145 can be inserted. The remaining edge of the base surface is arranged such that it covers the face of the stator 110 facing it. In another design, the heat-conducting element 140 can also be configured as a simple tube, for example, press-fitted onto the stator 110.

[0034] The heat-conducting element 140 is at least partially arranged on the surface of the stator 110 facing away from the rotor 120 or on the outer surface 114, and also at least partially arranged on the surface of the defined wet chamber 103 of the pump 100, here on the partition 152. The heat-conducting element 145 is at least partially arranged on the surface of the defined wet chamber 103 of the pump 100, here on the partition 151.

[0035] Thermal elements 140 and 145 can, as Figure 6A and 6B The example shown is manufactured as a deep-drawing part ( Figure 6A ) or manufactured as a bending part ( Figure 6B Or it can be manufactured using other manufacturing methods. The use of aluminum alloys is particularly advantageous because they are easily machinable and inexpensive materials with high thermal conductivity. Enlarged surface structure 142 ( Figure 6B Small pyramids, for example, can also be easily incorporated into aluminum alloys. Depending on the manufacturing method, the material used may be able to have such an enlarged surface structure 142 from one side or both sides.

[0036] In order to embed the corresponding components into the electrically insulating solid material 150, the following can be done, for example: The pre-assembled components, including the stator 110 with press-fit pins 113, heat-conducting elements 140 and 145 (e.g., aluminum plates), and shaft 170, are placed into a plastic mold (e.g., an injection mold) and extruded for encapsulation. This also creates interfaces with respect to the rotor 120, circuit board 130 (support point 153), housing cover 160, conveyor mechanism 125, and hydraulic device cover 190. According to the embodiment shown here, the housing cover 145, which at least partially closes the openings in the housing, is embedded in the plastic along with the stator housing 140.

[0037] Waste heat generated during operation (from the stator 110 and especially the circuit board 130) is directed to the pressure side 102 of the pump 100 via the heat-conducting elements 140, 145, especially for the high-power pump 100, and dissipated to the liquid flowing there. The efficiency of heat transfer can be improved by using the thinnest possible layer thickness of the electrically insulating solid material 150 in the region (in which heat is transferred to or from the heat-conducting elements 140, 145 to the liquid). Especially for particularly high power in a small structural space, a structure 142 with an enlarged surface (in the electrically insulating solid material 150 and / or the heat-conducting elements 140, 145 themselves) can be provided in the region of the heat-conducting elements 140, 145 for heat transfer, where needed. The structure 142 with the enlarged surface (see also...) Figure 6BThis can be achieved, for example, by using thin sheets, blunt tetrahedrons, blunt pyramids, etc., striving for the largest possible surface area with the smallest possible volume or wall thickness. Furthermore, by distributing these materials across the surface, the expanded surface area induces less stress, minimizing the risk of cracking and increasing service life. This also better compensates for the different coefficients of thermal expansion of materials, thereby preventing crack formation and improving robustness. The same measures can be taken in the region of rotor 120 (i.e., in the region at the interface between the heat-conducting element 145 and the rotating chamber of rotor 120), especially if this is meaningful or necessary for thermal or mechanical reasons. This, for example, avoids intentional hydraulic "short circuits" from the pressure side 102 of the conveying mechanism 125 through the conveying mechanism 125 to the rotor chamber containing the cooling medium, thereby improving the overall efficiency of pump 100.

[0038] Waste heat is directed toward the liquid being pumped by the pump 100 through direct contact between the stator 110 or the circuit board (or the heat-generating electrical component) 130 and the heat-conducting elements 140, 145. Because the pump 100 generates the most heat with the largest flow rate at its maximum power, the pump 100 is thus optimally cooled during operation without depending on external influences.

[0039] For the extruded stator 110, heat is conducted directly from the copper wires of the stator winding 111 through the electrically insulating solid material into the stator core 112 (plate / stator-sheet) and towards the heat-conducting element 140, and the heat is not initially "isolated" through an air gap or conducted only through slight line contact. This also prevents mutual heating between the power electronics or circuit board 130 and the stator 110.

[0040] The stator 110 is held together by pre-installation in the heat-conducting element 140, and it can be additionally equipped with, for example, press-fit pins 113 and another heat-conducting element 145 for the circuit board 130. Therefore, manipulation and continued transport during manufacturing become significantly easier, and the complete structural assembly can be directly placed into the injection mold along with the shaft 170 and extruded. Because the stator 110 is diametrically aligned with the conveyor 125, the accuracy of the interface between the conveyor 125 and the rotor 120 can be significantly improved compared to conventional methods. Because the shaft 170 is also fixed in position by the injection molding process, the required gap relative to the rotor 120 can be significantly reduced, thereby improving the efficiency of the electric drive and hydraulic system of the pump 100 (the smaller backflow from the pressure side 102 to the suction side 101 on the impeller).

[0041] The proposed solution can be achieved using a “simple” injection mold that only closes and reopens during lateral movement, thereby making the requirement easier to meet and allowing many of the necessary interfaces to be located in the same mold half.

[0042] Therefore, during the injection molding process, the complete interfaces with respect to the rotor 120, shaft 170, and conveyor 125 are located on one side, and because the interface with respect to the hydraulic housing 190 is also located in the same mold half, the minimum required distance between the conveyor 125 and the corresponding contour of the electrically insulating solid material 150 is also reduced. Furthermore, some installation steps that are traditionally necessary (such as mechanically installing the stator 110) can be saved.

[0043] On the axially opposed side (electronics side), the stator 110 is oriented and supported by a fixed mold. Because this side does not come into contact with the liquid in the example shown and the open support geometry is entirely within the structural space of the power electronics 130, no additional seals are required and therefore no additional moving parts are needed in the mold.

[0044] The described casting method produces a fully finished, further machinable component that can be used without additional finishing. Orientation in the mold is achieved, for example, by centering through the inner diameter of the stator 110, thereby achieving good positional tolerances relative to the shaft 170. The stator 110 is also laid flat directly on the "bottom" of the mold as a sheet 112, thereby further improving the orientation of the shaft 170, avoiding tilting positions, and significantly improving tolerances.

[0045] Furthermore, depending on the selected material pairing, a sealing interface is created, such as one relative to the heat-sealed joint, or a welded interface relative to the housing cover 160. This eliminates the need for additional components and installation steps such as screwing.

[0046] Furthermore, in the injection molding process, a support surface (support point 153) for the circuit board 130 and relative to the thermally conductive element 145 (e.g., an aluminum plate) is also formed on the electronic device side. The press-in pins 113 are also fixed in their correct positions by pre-centering and extrusion encapsulation. The raised position of the circuit board 130 makes handling, installation, and inspection significantly easier.

[0047] In the example shown here, small copper tabs serving as contact interfaces are pre-installed (e.g., pre-soldered or pre-plugged) on circuit board 130. Contact is made via fork-type contacts during installation, such as soldering the housing cover 160. Depending on the chosen solid material 150, a ventilation diaphragm (not shown here) may be integrated into the housing cover 160 to allow "moist" air to escape before damage occurs to electrical components or interfaces. Alternatively, the housing cover 160 may be made of a more diffusion-permeable material (especially compared to solid material 150), thus eliminating the need for a ventilation diaphragm.

[0048] Thus, the pump 100 is generally simple in construction and can be flexibly adapted according to power ratings. For example, the heat-conducting elements 140, 145 can be of particularly high value depending on the desired implementation, or can be replaced by inexpensive alternatives (e.g., in terms of material selection and / or structural design). A stator 110 with fewer copper windings 111 or other circuit boards 130 can also be used. The housing cover 160 can be equipped with a corresponding dedicated interface 162 according to the desired plug geometry.

[0049] A rotor 120 with injected magnets is preferably used. The stator 110 is pre-installed or constructed as is commonly done, and then inserted into the heat-conducting element 140 by means of the outer diameter (as required, such as press-fitting, heat-fitting, etc.). The enameled wire ends of the stator winding 111 can be positioned before or after this process to facilitate compression encapsulation and, for example, before embedding into the electrically insulating solid material 150, be fitted with press-fit pins 113 or other electrical contact mating parts to facilitate subsequent connection to the circuit board or plug pins. Electrical and / or mechanical connections between the stator 110 or solid material 150 and the circuit board or power electronics 130 can be made, for example, by resistance welding, heat positioning or heat sealing, heat compression welding, crimping, brazing, laser welding, clamping, etc. As an alternative to the aforementioned press-fit pins 113, the stator winding 111 can also be directly connected to the circuit board 130 by brazing, clamping, or other methods. The heat generated in the stator 110 and at the electrical interface, in the example shown here, is transported, in particular, to the pressure side 102 on the end side of the pump 100 by means of heat-conducting elements 140, 145.

[0050] The thermally conductive element 145 can be pre-installed, for example, by pressing it into the thermally conductive element 140, thereby ensuring a sufficiently good thermal connection between the thermally conductive elements 140 and 145. The thermally conductive element 145 can be particularly machined, for example, by punching, so that the support dome for the stator 110, present in the injection mold, can pass through. The aforementioned support dome is used to align the stator 110 with the shaft 170 during installation and to additionally fix the axial position of the stator 110. This prevents the stator 110 from moving during injection molding. Furthermore, the thermally conductive element can be configured (for example, with a recess) so that the molten plastic can form the support / orientation interface 153 for the circuit board 130 and the press-in pin 113 remains stationary. Additional slots or openings can also be provided in the thermally conductive elements 140 and 145 if needed to induce good and rapid plastic filling. The thermally conductive elements 140 and 145 are preferably made of materials with good thermal conductivity, especially metals such as aluminum, copper, iron, or corresponding alloys. Provided sufficient heat conduction is ensured, different (and theoretically oxidized) materials can be used for thermal elements 140 and 145, since they do not come into contact with the liquid or the outside. This allows for maximum flexibility, avoids costly processes, and ensures lower material costs. The dimensions, especially the thickness, of thermal elements 140 and 145 can be determined not only by the heat dissipation design but also by strength requirements, enabling them to perform stabilization functions in addition to their thermal tasks. Furthermore, thermal elements 140 and 145 can be designed and used as EMV shielding.

[0051] If the stator 110 is not arranged in the dry chamber of the pump 100, that is, it is not cast together in the solid material 150, the heat-conducting element 140 can be abandoned if necessary, because the stator 110 is already surrounded and flushed by the liquid being pumped in such a case.

[0052] Depending on the liquid being transported, a suitable electrically insulating solid material, especially a plastic (based on media stability, maximum hygroscopicity, strength, etc.), can be selected, with the thinnest possible wall thickness between the heat-conducting elements 140, 145 and the liquid. This allows for rapid heat dissipation and enables efficient operation of the pump 100 without overheating. Otherwise, if the heat generated in the circuit board 130 or the stator 110 is not dissipated quickly enough, the surface geometry, as described above, can be enlarged not only at the heat-conducting elements 140, 145 but also at the solid material 150. This surface enlargement at the solid material 150 can be achieved through the appropriate geometry on the mold without incurring significant additional costs.

[0053] By appropriately selecting the injection point, optimal contact can be achieved, thereby enabling faster plastic filling of the mold for heat conduction between the solid material 150 and the stator 110 or the heat-conducting elements 140, 145. The molten liquid acting on the outer diameter of the heat-conducting element (in the example of injection molding with thermoplastic plastic) generates inward hydraulic pressure, thereby reducing the spacing between the heat-conducting element 140 and the stator sheet 112 (outer diameter), and between the heat-conducting elements 140 and 145. This compensates for manufacturing tolerances (such as shape, flatness, roughness, etc.) when necessary, as greater plastic deformation also occurs with larger spacing. Consequently, the robustness and quality of the connection are permanently improved due to the described extrusion encapsulation, and the fluctuations caused by tolerances are reduced. Thus, larger tolerances are possible, and a simple and inexpensive process for single-piece manufacturing can be used.

[0054] The extrusion encapsulation of the stator 110 can be further non-destructively inspected, for example, by means of high-voltage insulation testing, to ensure a completely crack-free and "clean" solid material encapsulation, thereby evaluating the sealing performance of the finished components. The complete extrusion encapsulation of the stator 110 additionally facilitates the direct removal of heat from the enameled wire via the solid material, resulting in more even heat distribution and faster heat dissipation. Therefore, robustness against overheating is improved not only at the stator 110 but also at the electrical interfaces and circuit board 130.

[0055] As already mentioned, in this method on the pump's electronic side, a support or receiving portion 153 for the circuit board 130 (including the well-positioned press-in pins 113 and thermal element 145) is also created for the circuit board 130 to be installed later. If not only enameled wire is used, but also press-in pins 113 (or similar contacts) are used as proposed, the installation and contact of the circuit board 130 are very simple and verifiable. Furthermore, the thermal element 145 can provide EMV shielding not only externally but also between the stator 110 and the circuit board 130. In addition, the thermal element 145 improves the rigidity of the circuit board receiving portion 153 and significantly reduces adverse movements (such as vibrations during pump 100 operation). Furthermore, the thermal elements 140 and 145 withstand forces occurring within the service life of the pump 100 and thereby reliably maintain the position of the shaft 170 relative to the stator 110.

[0056] Depending on the selected solid material 150, the interface with respect to the housing cover 160 can be a simple welded interface, or a sealing surface with a spiral dome or spiral hole for direct threaded connection or locking (for interlocking connection). Here, there are limitations in welding, as not every possible insulating solid material 150 is suitable for the plug interface. In any case, the interface for housing cover 160 is housed in the same mold half as the receiving portion 153 for circuit board 130, resulting in good maintenance of the same precision or tolerances. Because the plug contacts are installed concealed, it is recommended to make direct fork contacts 132 on the contact pieces integrated into circuit board 130. Fork contacts can well compensate for tolerances and are optimally suited for concealed installation.

Claims

1. A pump (100) for conveying liquid from a suction side (101) to a pressure side (102) of the pump (100), wherein the pump (100) has an electric drive having a stator (110) and a rotor (120) mechanically connected to a conveying mechanism (125), wherein at least one heat-conducting element (140, 145) is arranged at least along a surface of the stator (110), the heat-conducting element being configured to absorb heat from the stator (110) and / or at least one other component of the pump (100), in particular a power electronic device (130) for energizing the stator, and dissipate it to the liquid conveyed by the pump (100).

2. The pump (100) according to claim 1, wherein the at least one heat-conducting element (140, 145) is in thermal contact with the pressure side (102) of the pump (100) and / or is arranged at least partially on the surface (151, 152) of the wet chamber (103) defining the pump (100) and / or on the surface (114) of the stator (110) opposite to the rotor (120).

3. The pump (100) according to claim 1 or 2, wherein the stator (110) is arranged in the dry chamber (104) of the pump (100) and the rotor (120) is arranged in the wet chamber (103) of the pump (100), wherein the dry chamber (104) is not flushed by liquid and the wet chamber (103) is at least partially flushed by liquid.

4. The pump (100) according to any one of the preceding claims, wherein the at least one heat-conducting element (140, 145) has a structure (142) with an enlarged surface, at least in the region configured to transfer heat from the stator (110) to the at least one heat-conducting element (140, 145) and / or in the region configured to transfer heat from the at least one heat-conducting element (140, 145) to the liquid and / or in the region configured to transfer heat from at least one additional component to the at least one heat-conducting element (140, 145).

5. The pump (100) according to any one of the preceding claims, wherein the at least one heat-conducting element (140, 145) has at least one bent part and / or at least one deep-drawn part and / or at least one plate part and / or die-cast part.

6. The pump (100) according to any one of the preceding claims, wherein the at least one heat-conducting element (140, 145) has at least one metal, particularly one or more from the group consisting of aluminum, iron and copper and their alloys.

7. The pump (100) according to any one of the preceding claims, wherein the at least one heat-conducting element (140, 145) has at least one housing (140) for receiving a stator (110) and / or a cover (145) for at least partially closing an opening in the housing (140).

8. The pump (100) according to any one of the preceding claims, wherein the stator (110) together with at least one thermally conductive element (140, 145) is at least partially embedded in an electrically insulating solid material (150).

9. The pump (100) according to claim 8, wherein the shaft (170) carrying the rotor (110) is at least partially embedded in an electrically insulating solid material (150).

10. The pump (100) according to claim 8 or 9, wherein the electrically insulating solid material (150) has a higher thermal conductivity than air, and / or wherein the electrically insulating solid material (150) has one or more of the following groups: thermoplastic plastics, thermosetting plastics and ceramic materials.

11. A coolant circuit having a coolant and at least one pump (100) according to any one of the preceding claims, wherein at least one pump (100) is configured to deliver the coolant in the coolant circuit.

12. A vehicle, particularly a vehicle at least partially electrically driven, having a coolant circuit according to claim 11 and / or at least one pump (100) according to any one of claims 1 to 10.

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