Pump device

Abstract

A pump device, in particular an immersible pump device, includes at least one heat exchanger unit which is in at least one operation state configured for a heat exchange between a cooling fluid and a liquid that is to be pumped and which includes at least one cooling duct and at least one shaft receptacle having an axial direction, wherein a cross section surface area of the cooling duct changes by maximally 200% at least over a major portion of a course of the cooling duct.

Claims

1. A pump device, in particular an immersible pump device, with at least one heat exchanger unit which is in at least one operation state configured for a heat exchange between a cooling fluid and a liquid that is to be pumped and which comprises at least one cooling duct and at least one shaft receptacle having an axial direction, wherein a cross section surface area of the cooling duct changes by maximally 200% at least over a major portion of a course of the cooling duct, the heat exchanger unit comprises at least one further cooling duct, over the major portion of the course of the cooling duct, a circular-arc-wise distance from the cooling duct to the further cooling duct, extending concentrically to a center point of the shaft receptacle, corresponds to at least 50% of a width of the cooling duct, and the further cooling duct is arranged adjacently to the cooling duct.

2. The pump device according to claim 1, wherein the cross section surface area of the cooling duct changes over the major portion of the course of the cooling duct irreversibly, if at all.

3. The pump device according to claim 1, wherein the cross section surface area of the cooling duct is at least substantially constant over the major portion of the course of the cooling duct.

4. The pump device according to claim 1, wherein the heat exchanger unit comprises at least one further cooling duct wherein, over the major portion of the course of the cooling duct, a circular-arc-wise distance from the cooling duct to the further cooling duct, extending concentrically to a center point of the shaft receptacle, corresponds to maximally 400% of a width of the cooling duct.

5. The pump device according to claim 1, wherein the heat exchanger unit comprises at least one sealing component and at least one cover element, which together define the cooling duct over the major portion of its course.

6. The pump device according to claim 1, wherein the cooling duct is curved along the major portion of its course.

7. The pump device according to claim 6, wherein the cooling duct is continuously curved along the major portion of its course.

8. The pump device according to claim 6, wherein a curvature direction of the cooling duct is identical to a rotational direction of the cooling wheel.

9. The pump device according to claim 1, wherein the cooling duct comprises at least one end region which, viewed along the axial direction, has a tangential orientation aiming at least substantially towards a center point of the shaft receptacle.

10. The pump device according to claim 1, wherein viewed along the axial direction, the cooling duct is situated within a circle sector of a circle whose center point is identical to a center point of the shaft receptacle, the circle sector having a central angle of at least 20 degrees.

11. The pump device according to claim 1, wherein the heat exchanger unit comprises a plurality of cooling ducts which together have an at least 10-fold rotational symmetry with respect to the axial direction.

12. The pump device according to claim 11, wherein the cooling ducts are arranged at least substantially in a shape of an impeller.

13. The pump device according to claim 1, further comprising at least one cooling wheel, which is supported rotatably and is configured to transport the cooling fluid from an entry opening of the cooling duct through the cooling duct to an exit opening of the cooling duct.

14. A pump, in particular an immersible pump, with a pump device according to claim 1.

15. The pump device according to claim 1, wherein the circular-arc-wise distance extending concentrically to a point is a length of a section line that, viewed along the axial direction and in a section through the heat exchanger unit, with the course of the section corresponding to a circle around the point, realizes a spacing between the cooling ducts and the further cooling duct.

16. The pump device according to claim 1, wherein the width of the cooling duct is a length of a section line that connects two opposite-situated points of a cooling duct wall to each other.

Description

DRAWINGS

(1) Further advantages will become apparent from the following description of the drawings. The drawings show an exemplary embodiment of the invention. The drawings, the description and the claims contain a plurality of features in combination. Someone skilled in the art will purposefully also consider the features individually and will find further expedient combinations.

(2) It is shown in:

(3) FIG. 1 a schematic representation of a pump with a pump device in a cross-sectional view,

(4) FIG. 2 a schematic representation of a sealing component of the pump device in a diagonal view,

(5) FIG. 3 a schematic representation of the sealing component in a top view,

(6) FIG. 4 a schematic representation of a heat exchanger unit with the sealing component, in a top view, and

(7) FIG. 5 a schematic representation of two cooling ducts of the heat exchanger unit in a sectional view.

DESCRIPTION OF THE EXEMPLARY EMBODIMENT

(8) FIG. 1 shows a pump 48 in a very simplified cross-sectional view. The pump 48 comprises an engine unit 11. The engine unit 11 is embodied as an electromotor.

(9) Alternatively the engine unit 11 could be embodied as an internal combustion engine. The pump 48 comprises a drive shaft 25. In an operation state the engine unit 11 generates a rotation of the drive shaft 25. The drive shaft 25 is on one end connected with a screw unit 15. The screw unit 15 is configured to set a liquid that is to be pumped (not shown) in motion. In the operation state the screw unit 15 rotates together with the drive shaft 25. The pump 48 comprises an engine bay 13. The engine unit 11 is arranged entirely within the engine bay 13. The pump 48 comprises a shell unit 17. The shell unit 17 is bell-shaped. The shell unit 17 partially delimits the engine bay 13 towards an outside. The shell unit 17 comprises cooling ducts (not shown) for receiving a cooling fluid (not shown either). The shell unit 17 is made of cast-iron. Alternatively the shell unit 17 could be made of stainless steel and/or ceramic. The pump 48 comprises a bearing cover 19. The bearing cover 19 forms a ceiling of the engine bay 13 that faces away from the screw unit 15. The bearing cover 19 is made of a material that is identical to the material of the shell unit 17.

(10) The pump 48 comprises a pump device 10. The pump device 10 comprises a heat exchanger unit 12. In the operation state the heat exchanger unit 12 is configured for a heat exchange between the cooling fluid and the liquid that is to be pumped. The heat exchanger unit 12 comprises a sealing component 26, which is depicted in detail in FIGS. 2 and 3. The sealing component 26 seals an opening of the shell unit 17 that faces towards the screw unit 15. The sealing component 26 forms a bottom of the engine bay 13 that faces towards the screw unit 15. The sealing component 26 is embodied in a bowl-shape. The sealing component 26 is made of a material that is identical to the material of the shell unit 17. The heat exchanger unit 12 comprises a cover element 28, which is shown in detail in FIG. 4. The cover element 28 is embodied in a plate shape. The cover element 28 is embodied in a circular-disk shape. The cover element 28 lies directly upon the sealing component 26. The cover element 28 is screwed to the sealing component 26.

(11) The heat exchanger unit 12 comprises twenty-five cooling ducts. The cooling ducts together have a 25-fold rotational symmetry with respect to an axial direction 18. The cooling ducts are implemented in a shape of an impeller. The cooling ducts are implemented identically to one another and therefore, to provide a better overview, only a cooling duct 14 and a further cooling duct 20 are given reference numerals and will be described below. Alternatively the heat exchanger unit 12 could comprise only one cooling duct. The sealing component 26 and the cover element 28 together define the cooling duct 14. The sealing component 26 comprises a deepening that defines a duct wall 27 of the cooling duct 14. The duct wall 27 has a largely oval cross section over a major portion of the course. The cover element 28 lies over the deepening and defines a duct ceiling 29. A partial region of the deepening, which extends beyond the cover element 28 in an outer edge region, defines an entry opening 21 of the cooling duct 14. A partial region of the deepening, which extends beyond the cover element 28 in an inner edge region, defines an exit opening 23 of the cooling duct 14. The cooling fluid flows in a cooling cycle. The cooling fluid flows from the shell unit 17 into the entry opening 21. The cooling fluid flows through the cooling duct 14 and through the exit opening 23 back into the shell unit 17.

(12) The heat exchanger unit 12 comprises a shaft receptacle 16. The shaft receptacle 16 is embodied as circle-disk-shaped partial region of the sealing component 26. The shaft receptacle 16 defines an inner edge of the heat exchanger unit 12. The shaft receptacle 16 has an axial direction 18. The drive shaft 25 is aligned along the axial direction 18. The drive shaft 25 penetrates the shaft receptacle 16.

(13) A cross section surface area of the cooling duct 14 changes by approximately 20% over a major portion of a course of the cooling duct 14. Alternatively the cross section surface area could change by approximately 50% or approximately 100%. The cross section surface area of the cooling duct 14 changes irreversibly over the major portion of the course of the cooling duct 14. The cross section surface area of the cooling duct 14 monotonically decreases radially towards the shaft receptacle 16. Alternatively the cross section surface area of the cooling duct 14 could as well be consistent over the major portion of the course.

(14) FIG. 5 shows the further cooling duct 20 together with the cooling duct 14 in a sectional view. The sectional view corresponds to a circular section along the section line A, wherein the section area has been unfolded to form a plane. The section line A corresponds to a circle whose center point is identical to a center point 34 of the shaft receptacle 16. The further cooling duct 20 is arranged adjacently to the cooling duct 14. The further cooling duct 20 is identical to the cooling duct 14 in regard to all further features. A circular-arc-wise distance 24 between the cooling duct 14 and the further cooling duct 20, extending concentrically to a center point 34 of the shaft receptacle 16, over the major portion of the course of the cooling duct 14 corresponds to approximately 150% of a width 22 of the cooling duct 14. Alternatively the circular-arc-wise distance 24 could also correspond to 50% or 400% of the width 22.

(15) The cooling duct 14 is continuously curved along the major portion of its course. Alternatively the cooling duct 14 could section-wise extend straight and/or have differing curvature directions. The cooling duct 14 comprises an end region 30. The end region 30 borders on the exit opening 23 of the cooling duct 14. Viewed along the axial direction 18, the end region 30 has a tangential orientation 32. The tangential orientation 32 essentially extends towards a center point 34 of the shaft receptacle 16. The cooling duct 14 comprises a further end region 31. The further end region 31 borders on the entry opening 21 of the cooling duct 14. To a large extent, the further end region 31 tangentially meets with a circle (not shown) whose center point is identical to the center point 34 and which just still accommodates the cooling duct 14.

(16) When viewed along the axial direction 18, the cooling duct 14 is situated within a circle sector 36 of the circle. The circle sector 36 has a central angle (not shown) of approximately 45 degrees. Alternatively the circle sector 36 could have a central angle of 90 degrees.

(17) The pump device 10 comprises a cooling wheel 38. The cooling wheel 38 is movably supported. The cooling wheel 38 is fixated on a half of the drive shaft 25 that faces towards the screw unit 15. Alternatively the pump device could comprise one cooling wheel or a plurality of cooling wheels, which might be fixated on a half of the drive shaft 25 that faces away from the screw unit 15. The cooling wheel 38 is configured for a transport of the cooling fluid from the entry opening 21 of the cooling duct 14 through the cooling duct 14 to the exit opening 23 of the cooling duct 14. A curvature direction 44 of the cooling duct 14 is identical to a rotational direction 46 of the cooling wheel 38.

REFERENCE NUMERALS

(18) 10 pump device 11 engine unit 12 heat exchanger unit 13 engine bay 14 cooling duct 15 screw unit 16 shaft receptacle 17 shell unit 18 axial direction 19 bearing cover 20 cooling duct 21 entry opening 22 width 23 exit opening 24 circular-arc-wise distance 25 drive shaft 26 sealing component 27 duct wall 28 cover element 29 duct cover/ceiling 30 end region 31 end region 32 tangential orientation 34 center point 36 circle sector 38 cooling wheel 44 curvature direction 46 rotational direction 48 pump