Pump unit

Abstract

The present invention is based on a pump device (10), in particular a submersible pump device, which has at least one heat exchanger unit (12), the heat exchanger unit being in at least one operating state configured for heat exchange between a cooling fluid and a liquid to be pumped, the heat exchanger unit comprising at least one cooling pipe (14) and at least one shaft receiving part (16) having an axial direction (18). It is proposed that the cross-sectional area of the cooling pipe (14) changes by approximately 200% over a major part of the route of the cooling pipe (14).

Description

Technical Field

[0001] The present invention relates to a pump device. Background Art

[0002] It has been proposed to seal the engine compartment of a pump by a sealing plate, which includes cooling ducts for receiving a cooling fluid in order to better cool the engine compartment.

[0003] The object of the present invention is in particular to provide a general device with improved characteristics in terms of heat exchange. According to the present invention, this object is achieved by one aspect of the present invention, while advantageous embodiments and further developments can be obtained from another aspect of the present invention. Summary of the Invention

[0004] The present invention is based on a pump device, in particular a submersible pump device, which has at least one heat exchanger unit, the heat exchanger unit being in at least one operating state configured for heat exchange between a cooling fluid and a liquid to be pumped, the heat exchanger unit including at least one cooling duct and at least one shaft receiving portion having an axial direction.

[0005] It is proposed that at least in the main part of the cooling duct route, the cross-sectional area of the cooling duct changes by a maximum of 200%. The heat exchanger unit may in particular include a plurality of cooling ducts. This allows for improved heat exchange. In particular, uniform heat transfer from the cooling fluid to the liquid to be pumped can be achieved. Advantageously, the optimal cross-sectional area can be at least substantially maintained over the main part of the route, thus allowing a high flow rate of the cooling fluid and a large contact area for heat transfer. Particularly advantageously, simple manufacture of the heat exchanger unit can be achieved.

[0006] "Pump device" should be understood in particular as at least a component of the pump, in particular a sub-assembly. In particular, the pump device may also include the entire pump. "Pump", in particular a submersible pump, should be understood in particular as an appliance which provides movement of the liquid to be pumped in at least one operating state, and the liquid is preferably incompressible. Preferably, the pump device comprises: a housing unit which delimits the pump from the outside; a drive shaft which is driven by an engine unit of the pump device; and / or a screw unit which is configured to be rotated by the drive shaft in at least one operating state, the rotation of the screw unit providing movement of the liquid to be pumped. Alternatively, the pump device may include a piston unit which is driven by an engine unit of the pump device and causes movement of the liquid to be pumped by a displacement process. Advantageously, the engine unit is arranged in an engine compartment of the pump, the engine compartment delimiting the outside. The engine unit may in particular include an internal combustion engine. Particularly advantageously, the engine unit includes an electric motor. In particular, in at least one operating state, the pump may be arranged outside the liquid to be pumped and / or at least partially or completely arranged in the liquid to be pumped.

[0007] "Heat exchanger unit" should be understood in particular as a unit configured to receive heat from at least one fluid and / or element and transfer the heat to at least one other fluid and / or element. The heat exchanger unit particularly includes at least one local region which forms at least one surface area amplification structure. Advantageously, the heat exchanger unit additionally includes at least one plate-like element. "Plate-like element" is particularly intended to describe an element in which the smallest imaginary rectangular cuboid that houses the element has a height that is at most equal to 50% of the length and width of the rectangular cuboid, in particular at most equal to 20%, advantageously at most equal to 10%, preferably at most equal to 5%. Advantageously, the plate-like element contributes to the delimitation of the cooling ducts. Particularly advantageously, the heat exchanger unit contributes to the delimitation of the engine compartment and the outside. It is conceivable that the heat exchanger unit is part of the housing unit. Preferably, the heat exchanger unit is arranged at the end of the engine compartment facing the screw unit. Particularly preferably, in the assembled state, the heat exchanger unit and the housing unit achieve a sealed connection together. It is conceivable that the heat exchanger unit is pressed and / or welded to the housing unit. The heat exchanger unit is preferably screwed to the housing unit. The heat exchanger unit preferably includes the same material as the housing unit. This particularly allows ensuring good sealing of the engine compartment at different temperatures. In particular, the heat exchanger unit may include at least one, preferably rubber-like, sealing ring which contributes to the sealed connection of the contact area with the housing unit. Particularly preferably, the heat exchanger unit is implemented as the bottom plate of the engine compartment.

[0008] "Cooling fluid" is particularly understood to be such a liquid that is configured to receive the heat of at least one component and particularly transfer the liquid to another component, such as a heat exchanger unit. Preferably, the cooling fluid has high thermal conductivity and / or heat capacity. Particularly preferably, the cooling fluid has a viscosity that allows the cooling fluid to be pumped. It is conceivable that the cooling fluid is the same as the pumped medium, but preferably, the cooling fluid is different from the pumped fluid and is particularly configured for cooling the pump. The cooling fluid can, for example, contain water and / or oil.

[0009] "Cooling duct" is particularly understood to be a continuous volume through which the cooling fluid flows in at least one operating state. Advantageously, a particularly a groove in the continuously deepened portion of the heat exchanger unit contributes to the definition of the cooling duct. The deepened portion particularly defines a duct wall that defines the cooling duct and the heat exchanger unit. Preferably, in the main part of the path, the cross-section of the duct wall is substantially oval or circular. In this case, "substantially oval or circular cross-section" should particularly be understood to mean that at least 60%, advantageously at least 70%, preferably at least 80%, particularly preferably at least 90% of the cross-section of the duct wall is covered by an oval or a circle that does not intersect the duct wall. It is also conceivable that the cooling duct is configured as a hollow space that is open outward inside the heat exchanger unit. Particularly, the cooling duct includes at least one inlet and at least one outlet, which preferably define the flow direction of the cooling fluid flowing through the cooling duct. The inlet and the outlet preferably have different radial distances from the shaft receiving portion. Particularly preferably, the radial distance from the inlet to the shaft receiving portion is greater than the radial distance from the outlet to the shaft receiving portion. Advantageously, the cooling fluid flows in a cooling cycle in which the cooling fluid flows from the housing unit into the inlet, through the cooling duct, and back to the housing unit from the outlet. Preferably, the housing unit includes a cooling duct, wherein another outlet of at least one cooling duct of the housing unit is in fluid communication with the inlet, and another inlet of at least one cooling duct of the housing unit is in fluid communication with the outlet.

[0010] "Shaft receiving part" particularly means a local area of the heat exchanger unit that surrounds at least one opening of the heat exchanger unit through which the drive shaft can pass through the heat exchanger unit. The shaft receiving part preferably has at least substantially a disc shape. In this case, "at least substantially" particularly means considering conventional manufacturing tolerances. Particularly preferably, when viewed from a direction perpendicular to the axial direction, the shaft receiving part is spaced from the outer contour of the heat exchanger unit in at least substantially an even manner. The "axial direction" of the shaft receiving part is particularly understood as the direction defined by the shaft receiving part and in which the shaft receiving part can be oriented in the assembled state. Preferably, the axial direction is the only possible direction in which the drive shaft can be oriented in the assembled state. Preferably, the axial direction is oriented perpendicular to the main extension plane of the shaft receiving part. The "main extension plane" of an object is particularly understood as the plane that is parallel to the largest side surface of the smallest imaginary rectangular parallelepiped that just completely encloses the object and particularly extends through the center point of the rectangular parallelepiped. In particular, the drive shaft penetrates the shaft receiving part in the assembled state.

[0011] "Cross-sectional area" particularly means the surface area of the cross-section of the cooling duct. Herein, "cross-section" is particularly understood as the surface that is completely located within the cooling duct and is oriented perpendicular to the duct wall of the cooling duct. Preferably, when observed in a direction perpendicular to the extension direction of the surface, the surface completely fills the intermediate space surrounded by the duct wall.

[0012] "Main part of the path of the cooling duct" particularly means at least 60%, advantageously at least 70%, preferably at least 80%, particularly preferably at least 90% of the path of the cooling duct. It is conceivable that the main part of the path of the cooling duct includes the entire cooling duct. Preferably, the main part of the path of the cooling duct does not include the inlet and / or outlet of the cooling duct. The "path of the cooling duct" is particularly understood as the spatial extension of the cooling duct perpendicular to the cross-sectional surface of the cooling duct.

[0013] "Configure" particularly means to design and / or equip specifically. In particular, "configure" does not mean only describing applicability. In particular, a unit configured to perform a task performs the said task to the extent that satisfies the operator of the equipment to which the unit belongs. "Configure an object for a certain function" is particularly understood as that the object completes and / or executes the said specific function in at least one application state and / or operating state.

[0014] It is conceivable that the cross-sectional area of the cooling pipe alternately decreases and increases on the main part of the route of the cooling pipe. In order to improve the flow velocity of the cooling fluid in the cooling pipe, it is proposed that the cross-sectional area of the cooling pipe does not change reversely at most on the main part of the route of the cooling pipe. The cross-sectional area changing "non-reversely" is particularly understood as that, when observed along the route of the cooling pipe, the cross-sectional area changes such that it monotonically increases or decreases in one direction. When observed in the direction from the inlet to the outlet of the cooling pipe, the cross-sectional area preferably changes such that it monotonically decreases. Advantageously, a stable increase in the flow velocity of the cooling fluid when flowing through the cooling pipe can be achieved. Particularly advantageously, the residence of the cooling fluid due to a sudden decrease in the flow velocity is avoided.

[0015] It is further proposed that the cross-sectional area of the cooling pipe is at least substantially constant on the main part of the route of the cooling pipe. Advantageously, the cooling pipe has at least a substantially constant cross-sectional shape on the main part of the route of the cooling pipe. The "cross-sectional shape" is particularly understood as the outer contour of the cross-sectional surface. The cross-sectional shape can, for example, correspond to a cut-off circle or a cut-off oval. In this way, in particular, the uniformity of the heat transfer from the cooling fluid to the liquid to be pumped can be further improved. Advantageously, the production of the heat exchanger unit is further simplified.

[0016] Preferably, the heat exchanger unit includes at least one additional cooling pipe, wherein, on the main part of the route of the cooling pipe, the distance on the circular arc extending concentrically with respect to the center point of the shaft receiving portion from the cooling pipe to the additional cooling pipe is at least 50% of the width of the cooling pipe, in particular at least 100%, advantageously at least 150%, preferably at least 200%. Herein, the "distance on the circular arc extending concentrically with respect to a point" particularly means the length of the cross-sectional line in the cross-section passing through the heat exchanger unit when observed along the axial direction, the route of the cross-section corresponding to a circle around the point, and the cross-sectional line when the length realizes the interval between the two cooling pipes. The "width of the cooling pipe" is particularly understood as the length of the cross-sectional line connecting two opposite points of the pipe wall. This particularly allows for the improvement of the heat transfer via the heat exchanger unit. Advantageously, it can be ensured that the heat exchanger unit can receive sufficient heat from the cooling fluid and transfer the heat to the liquid to be pumped.

[0017] It is conceivable that the distance on the circular arc corresponds to a cooling duct width greater than 400%. Preferably, the heat exchanger unit includes at least one additional cooling duct, wherein the distance on the circular arc from the cooling duct to the additional cooling duct, which extends concentrically with respect to the center point of the shaft receiving portion, particularly corresponds to a maximum of 400% of the cooling duct, particularly a maximum of 350%, a maximum of 300%, preferably a maximum of 250%, and particularly preferably a maximum of 200%. This particularly allows for an improvement in the thermal output of the cooling fluid. Advantageously, a balance can be achieved between the heat introduced by the cooling fluid and the heat that can be accepted by the heat exchanger unit.

[0018] In an alternative embodiment, the cooling duct can be realized as an open cooling duct completely defined by a groove of the heat exchanger unit. To improve the contact between the heat exchanger unit and the cooling fluid, it is proposed that the heat exchanger unit includes at least one sealing member and at least one cover element, which together define the cooling duct in the main part of their path. The "sealing member" is particularly understood as an element of the heat exchanger unit that delimits the engine compartment and the exterior. Preferably, the sealing member includes a shaft receiving portion. Preferably, the sealing member includes a deepening portion. The "cover member" is particularly understood as an element of the heat exchanger unit that, together with the deepening portion, defines the cooling duct. In particular, in the assembled state, the cover element is directly placed on the deepening portion. Preferably, at least two local regions of the deepening portion extend beyond the cover element and define an inlet and an outlet. The cover element can be connected to the sealing member, for example, by a press fit and / or by a welding process. Preferably, the cover element is screwed to the sealing member. Advantageously, the pressure in the cooling duct for conveying the cooling fluid can be increased, thereby increasing the flow rate of the cooling fluid in the cooling pipe.

[0019] It is conceivable that the cooling duct has a straight path. Preferably, the cooling duct is curved in the main part of its path. The cooling duct being "curved" in a local region is particularly understood as the cooling duct having no straight part in the local region. The cooling duct particularly has a consistent direction change throughout the local region. This particularly allows for an improvement in the contact between the cooling fluid and the heat exchanger unit. Advantageously, the contact area where the cooling fluid and the heat exchanger unit come into contact increases independently of the cross-sectional area.

[0020] The cooling pipe can be alternately bent in different directions and includes at least one deflection point. To achieve a space-saving embodiment of the heat exchanger unit, it is proposed that the cooling pipe is continuously bent along the main part of its route. The cooling pipe being "continuously" bent in a local area is particularly understood to mean that the cooling pipe has no deflection point in the said local area. In the imaginary movement along the main part of the route of the cooling pipe, the direction of the route of the cooling pipe preferably undergoes a stable rotation in one direction. The "direction of the route of the cooling pipe" is particularly understood to be the direction extending perpendicular to the cross-section of the cooling pipe. Advantageously, the structural space of the cooling pipe is effectively utilized, and thus a contact area can be achieved with respect to the spatial extension of the heat exchanger unit.

[0021] In addition, it is proposed that the cooling pipe includes at least one end region which, when observed in the axial direction, has a tangential orientation that at least substantially points to the center point of the shaft receiving portion. The "end region" of the cooling pipe is particularly understood to be such a partial region that includes at most 10%, advantageously at most 5%, preferably at most 2% of the spatial extension of the cooling pipe, and this region is not directly adjacent to any other partial region of the cooling pipe along the route direction. The "tangential orientation" of the local region is particularly understood to be two directions that are not parallel to each other and are parallel to the tangents of the outer contour of the adjacent end region. In particular, the end region is directly adjacent to the outlet of the cooling pipe. Preferably, the cooling pipe includes at least one further end region which at least tangentially intersects a imaginary circle that exactly encloses the cooling pipe, and the center point of the imaginary circle is the same as the center point of the shaft receiving portion. The end region intersecting the imaginary circle "at least substantially tangentially" is particularly understood to mean that when the end region intersects the circle, the deflection of the orientation of the end region from the tangent at the intersection point of the circle is at most 20 degrees, advantageously at most 15 degrees, preferably at most 10 degrees. This particularly allows an increase in the flow rate of the cooling fluid in the cooling pipe. Advantageously, a reduction in the decrease in the flow rate due to frictional losses is possible.

[0022] To further improve the contact between the heat exchanger unit and the cooling fluid, it is proposed that, when observed in the axial direction, the cooling pipe is located within a sector portion of a circle, the center point of the circle being the same as the center point of the shaft receiving portion, and the sector portion having a central angle of at least 20 degrees, in particular at least 40 degrees, advantageously at least 60 degrees and preferably at least 80 degrees. This particularly allows a further improvement in the contact between the cooling fluid and the heat exchanger unit. Advantageously, the contact area where the cooling fluid and the heat exchanger unit are in contact with each other can be increased with respect to the cross-sectional area.

[0023] It is conceivable that the cooling ducts are helically wound around the shaft receiving portion. In order to improve the heat transfer efficiency from the cooling fluid to the heat exchanger unit, it is proposed that the heat exchanger unit includes a plurality of cooling ducts, and the plurality of cooling channels together have at least 10 folds with respect to the axial direction In particular, at least 15 folds, advantageously at least 20 folds, preferably at least 25 folds of rotational symmetry. Advantageously, after heat transfer, the coolant fluid can be quickly transported out of the heat exchanger unit.

[0024] In addition thereto, it is proposed that the cooling ducts are arranged at least substantially in the shape of an impeller. This particularly allows for a further improvement in the heat transfer from the cooling fluid to the liquid to be pumped. Advantageously, a large contact area for heat transfer, a high flow rate of the cooling fluid, a high heat transfer efficiency, and a high structural space efficiency of the cooling ducts can be achieved.

[0025] It is conceivable that an additional engine unit pumps the cooling fluid through the cooling ducts, or the pump device includes a cooling wheel that is fixed to the half of the drive shaft facing away from the screw unit. Advantageously, the pump device includes a rotatably supported cooling wheel that is configured to transport the cooling fluid from the inlet of the cooling duct through the cooling duct to the outlet of the cooling duct. A "cooling wheel" is particularly understood as an element in such an operating state that is configured to rotate and transport the cooling fluid by rotation. The cooling wheel particularly transports the cooling fluid from the half of the drive shaft facing the screw unit to the half of the drive shaft facing away from the screw unit. Preferably, the cooling wheel is fixed to the drive shaft and rotates with the drive shaft in at least one operating state. In particular, the cooling wheel is fixed to the half of the drive shaft facing the screw unit. This particularly allows for an improvement in the flow behavior of the cooling fluid.

[0026] In order to improve the energy efficiency, it is proposed that the curvature direction of the cooling ducts is the same as the rotation direction of the cooling wheel. The curvature direction "being the same as the rotation direction" is particularly understood as that in the imaginary movement from the inlet to the outlet, the direction of the route of the cooling duct is rotated, and the rotation direction of this rotation is the same as the rotation direction of the cooling wheel. Advantageously, the rotational impulse of the cooling fluid flowing through the cooling duct can be at least partially transferred to the cooling wheel. Description of the Drawings

[0027] Through the following description of the drawings, other advantages will become apparent. The drawings show exemplary embodiments of the present invention. The drawings and the description contain combinations of a plurality of features. Those skilled in the art will also purposefully consider these features individually and will find further advantageous combinations.

[0028] Which shows:

[0029] Figure 1 A schematic cross-sectional view of a pump with a pump device,

[0030] Figure 2 A schematic perspective view of a sealing member for a pump device,

[0031] Figure 3 A schematic top view of the sealing member,

[0032] Figure 4 A schematic top view of a heat exchanger having the sealing member,

[0033] Figure 5 A schematic cross-sectional view of two cooling pipes of the heat exchanger unit. DETAILED DESCRIPTION

[0034] Figure 1 The pump 48 is shown in a very simplified cross-sectional view. The pump 48 includes an engine unit 11. The engine unit 11 is implemented as an electric motor. Alternatively, the engine unit 11 can be implemented as an internal combustion engine. The pump 48 includes a drive shaft 25. In the operating state, the engine unit 11 generates rotation of the drive shaft 25. One end of the drive shaft 25 is connected to the screw unit 15. The screw unit 15 is configured to move the liquid to be pumped (not shown). In the operating state, the screw unit 15 rotates together with the drive shaft 25. The pump 48 includes an engine compartment 13. The engine unit 11 is completely arranged within the engine compartment 13. The pump 48 includes a housing unit 17. The housing unit 17 is bell-shaped. The housing unit 17 partially defines the engine compartment 13 and the exterior. The housing unit 17 includes cooling pipes (not shown) for receiving a cooling fluid (not shown). The housing unit 17 is made of cast iron. Alternatively, the housing unit 17 can be made of stainless steel and / or ceramic. The pump 48 includes a bearing cover 19. The bearing cover 19 forms the top cover of the engine compartment 13 that faces away from the screw unit 15. The bearing cover 19 is made of the same material as the housing unit 17.

[0035] The pump 48 includes a pump device 10. The pump device 10 includes a heat exchanger unit 12. In the operating state, the heat exchanger unit 12 is configured to effect heat exchange between a cooling fluid and the liquid to be pumped. The heat exchanger unit 12 includes a sealing member 26, which is shown in detail in Figure 2 and Figure 3 . The sealing member 26 seals an opening of the housing unit 17 that faces the screw unit 15. The sealing member 26 forms the bottom of the engine compartment 13 that faces the screw unit 15. The sealing member 26 is implemented in a bowl shape. The sealing member cover 26 is made of the same material as the housing unit 17. The heat exchanger unit 12 includes a cover element 28, which is shown in detail in Figure 4 . The cover element 28 is implemented in a plate shape. The cover element 28 is implemented in a disk shape. The cover element 28 is directly placed on the sealing member 26. The cover element 28 is tightened to the sealing member 26.

[0036] The heat exchanger unit 12 includes twenty-five cooling pipes. The cooling pipes together have a rotational symmetry of 25 folds with respect to the axial direction 18. The cooling channels are implemented in the shape of an impeller. The cooling pipes are implemented identically to each other. Therefore, for better description, only the cooling pipe 14 and another cooling pipe 20 are given reference numerals and described below. Optionally, the heat exchanger unit 12 may include only one cooling pipe. The sealing member 26 and the cover element 28 together define the cooling pipe 14. The sealing member 26 includes a deepening portion that defines the pipe wall 27 of the cooling pipe 14. The pipe wall 27 has a generally oval cross-section over the main part of the route. The cover element 28 is placed above the deepening portion and defines the pipe top cover 29. The partial area of the deepening portion that extends beyond the cover element 28 in the outer edge region defines the inlet 21 of the cooling pipe 14. The partial area of the deepening portion that extends beyond the cover element 28 in the inner edge region defines the outlet 23 of the cooling pipe 14. The cooling fluid flows in a cooling cycle. The cooling fluid flows into the inlet 21 from the housing unit 17. The cooling fluid flows through the cooling pipe 14 and flows back into the housing unit 17 through the outlet 23.

[0037] The heat exchanger unit 12 includes a shaft receiving portion 16. The shaft receiving portion 16 is implemented as a disk-shaped partial area of the sealing member 26. The shaft receiving portion 16 defines the inner edge of the heat exchanger unit 12. The shaft receiving portion 16 has an axial direction 18. The drive shaft 25 is aligned along the axial direction 18. The drive shaft 25 passes through the shaft receiving portion 16.

[0038] The cross-sectional area of the cooling pipe 14 changes by approximately 20% over the main part of the route of the cooling pipe 14. Alternatively, the cross-sectional area may change by approximately 50% or approximately 100%. The cross-sectional area of the cooling pipe 14 does not change reversely over the main part of the route of the cooling pipe 14. The cross-sectional area of the cooling pipe 14 decreases monotonically radially towards the shaft receiving portion 16. Alternatively, the cross-sectional area of the cooling pipe 14 may also be consistent over the main part of the route.

[0039] Figure 5 A cross-sectional view of another cooling pipe 20 and the cooling pipe 14 is shown. The cross-sectional view corresponds to a circular cross-section along the section line A, where the section area has been unfolded to form a plane. The section line A corresponds to a circle whose center point is the same as the center point 34 of the shaft receiving portion 16. Another cooling pipe 20 is arranged adjacent to the cooling pipe 14. In all other features, another cooling pipe 20 is the same as the cooling pipe 14. Over the main part of the cooling channel 14, the distance 24 on the circular arc between the cooling pipe 14 and another cooling pipe 20 that extends concentrically with respect to the center point 34 of the shaft receiving portion 16 is greater than 150% of the width 22 of the cooling pipe 14. Alternatively, the distance 24 on the circular arc may also correspond to 50% or 400% of the width 22.

[0040] The cooling duct 14 is continuously bent along a major part of its route. Alternatively, the cooling duct 14 may extend straight in cross-section and / or have different curvature directions. The cooling duct 14 includes an end region 30. The end region 30 abuts at the outlet 23 of the cooling duct 14. When viewed along the axial direction 18, the end region 30 has a tangential orientation 32. The tangential orientation 32 extends substantially towards the center point 34 of the shaft receptacle 16. The cooling duct 14 includes a further end region 31. The further end region 31 abuts at the inlet 21 of the cooling duct 14. The other end region 31 intersects substantially tangentially with a circle (not shown) that exactly accommodates the cooling duct 14, and the center point of this circle is the same as the center point 34.

[0041] When viewed along the axial direction 18, the cooling duct 14 is located within a sector portion 36 of a circle. The sector portion 36 has a central angle of approximately 45 degrees (not shown). Alternatively, the sector portion 36 may have a central angle of 90 degrees.

[0042] The pump device 10 includes a cooling wheel 38. The cooling wheel 38 is movably supported. The cooling wheel 38 is fixed to the half of the drive shaft 25 facing the screw unit 15. Alternatively, the pump device may include one or more cooling wheels, and the cooling wheels may be fixed to the half of the drive shaft 25 facing away from the screw unit 15. The cooling wheel 38 is configured to transport the cooling fluid from the inlet 21 of the cooling duct 14 through the cooling duct 14 to the outlet 23 of the cooling duct 14. The curvature direction 44 of the cooling duct 14 is the same as the rotation direction 46 of the cooling wheel 38.

[0043] Reference numerals

[0044] 10 Pump device

[0045] 11 Engine unit

[0046] 12 Heat exchanger unit

[0047] 13 Engine compartment

[0048] 14 Cooling duct

[0049] 15 Screw unit

[0050] 16 Shaft receptacle

[0051] 17 Housing unit

[0052] 18 Axial direction

[0053] 19 Bearing cover

[0054] 20 Cooling duct

[0055] 21 Inlet

[0056] 22 Width

[0057] 23 Outlet

[0058] 24 Distance on the arc

[0059] 25 Drive shaft

[0060] 26 Sealing component

[0061] 27 Pipe wall

[0062] 28 Cover element

[0063] 29 Pipe cover / Top cover

[0064] 30 End region

[0065] 31 End region

[0066] 32 Tangential orientation

[0067] 34 Center point

[0068] 36 Sector part

[0069] 38 Cooling wheel

[0070] 44 Curvature direction

[0071] 46 Rotation direction

[0072] 48 Pump.

Claims

1. A pump device (10) having at least one heat exchanger unit (12) in at least one operating state configured for heat exchange between a cooling fluid and a liquid to be pumped, and the heat exchanger unit including at least one cooling duct (14) and at least one shaft receiving portion (16) having an axial direction (18), characterized in that, The cross-sectional area of the cooling duct (14) changes by at most 200% at least over the main part of the path of the cooling duct (14), wherein the heat exchanger unit (12) comprises at least one further cooling duct (20), and wherein, over the main part of the path of the cooling duct (14), the circular arc distance (24) from the cooling duct (14) to the further cooling duct (20), which extends concentrically with respect to the centre point (34) of the shaft receptacle (16), corresponds to at least 50% of the width (22) of the cooling duct (14).

2. The pump device (10) according to claim 1, characterized in that, The cross-sectional area of the cooling duct (14) does not change reversely at most over the main part of the path of the cooling duct (14).

3. The pump device (10) according to claim 1, characterized in that, The cross-sectional surface area of the cooling duct (14) is constant over the main part of the path of the cooling duct (14).

4. The pump device (10) according to any one of the preceding claims, characterized in that, The heat exchanger unit (12) comprises at least one further cooling duct (20), and wherein, over the main part of the path of the cooling duct (14), the circular arc distance (24) from the cooling duct (14) to the further cooling duct (20), which extends concentrically with respect to the centre point (34) of the shaft receptacle (16), corresponds to at most 400% of the width (22) of the cooling duct (14).

5. The pump device (10) according to claim 1, characterized in that, The heat exchanger unit (12) comprises at least one sealing member (26) and at least one cover element (28), which together delimit the cooling duct (14) over the main part of the path of the cooling duct (14).

6. The pump device (10) according to claim 1, characterized in that, The cooling duct (14) is curved over the main part of its path.

7. The pump device (10) according to claim 6, characterized in that, The cooling duct (14) is continuously curved over the main part of its path.

8. The pump device (10) according to claim 1, characterized in that, The cooling duct (14) comprises at least one end region (30) which, when viewed in the axial direction (18), has a tangential orientation (32) which is aligned with the centre point (34) of the shaft receptacle (16).

9. The pump device (10) according to claim 1, characterized in that, When viewed in the axial direction (18), the cooling duct (14) lies within a sector (36) of a circle, the centre of the circle being the same as the centre point (34) of the shaft receptacle (16), and the central angle of the sector (36) being at least 20 degrees.

10. The pump device (10) according to claim 1, characterized in that, The heat exchanger unit (12) comprises a plurality of cooling ducts (14, 20) which together have at least 10-fold rotational symmetry with respect to the axial direction (18).

11. The pump device (10) according to claim 10, characterized in that, The cooling ducts (14, 20) are arranged in the shape of an impeller.

12. The pump device (10) according to claim 1, characterized in that, At least one cooling wheel (38) is rotatably supported and configured to transport cooling fluid from the inlet (21) of the cooling duct (14) through the cooling duct (14) to the outlet (23) of the cooling duct (14).

13. The pump device (10) according to claim 12, characterized in that, The cooling duct (14) is curved over the main part of its path, and the curvature direction (44) of the cooling duct (14) is the same as the rotational direction (46) of the cooling wheel (38).

14. A pump (48) having a pump device (10) according to any one of the preceding claims.

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