PUMP FOR CONVEYING A FLUID

Abstract

A pump for conveying a fluid includes a casing with a casing inner wall, a pump interior, an inlet opening, an outlet opening, a displacement assembly, and a radial protective element arranged in the pump interior in order to line at least one radial section of the pump interior, the radial protective element bearing against a radial section of the casing inner wall. A fastening element is provided which can be arranged in a fastening position in which the fastening element bears against an edge of the radial protective element and in the process fastens the radial protective element in the pump interior, wherein the fastening element has a longitudinal extent which extends from a first axial end of the pump interior along a recess arranged in the casing inner wall.

Claims

1-24. (canceled)

25. A pump for conveying a fluid comprising a casing having a casing inner wall; a pump interior delimited by the casing inner wall; an inlet opening through which the fluid can be conveyed into the pump interior; an outlet opening through which the fluid can be conveyed out of the pump interior; a displacement assembly arranged in and mounted movably relative to the pump interior and adapted to cause the fluid to be conveyed along a flow direction from the inlet opening to the outlet opening; a radial protective element arranged in the pump interior and lining at least one radial section of the pump interior, the radial protective element bearing against a radial section of the casing inner wall; and a first fastening element arranged in a fastening position in which the fastening element bears against an edge of the radial protective element and thereby fastens the radial protective element within the pump interior, wherein the first fastening element has a longitudinal extent extending from a first axial end of the pump interior along a recess disposed in the casing inner wall.

26. The pump according to claim 25, wherein the longitudinal extent of the first fastening element extends along the entire pump interior from the first axial end of the pump interior to a second axial end of the pump interior opposite the first axial end.

27. The pump according to claim 25, wherein the longitudinal extent of the first fastening element is arranged in an angle range of 0 to at most 5 relative to an axial direction running transversely to the flow direction, and wherein the recess extends parallel to the longitudinal extent of the fastening element.

28. The pump according to claim 25, wherein the longitudinal extent of the first fastening element extends in an axial direction running transversely to the flow direction, and wherein the recess extends in the axial direction.

29. The pump according to claim 27, wherein the edge of the radial protective element is arranged in an angle range of 0 to at most 5 relative to the axial direction, and wherein the edge extends parallel to the longitudinal extent of the first fastening element.

30. The pump according to claim 25, wherein the first fastening element is detachably connectable to the casing by a screw connection and is movable out of the pump and out of the recess in the casing in an axial direction when in a non-screwed state, and wherein the first fastening element is form-fittingly connected to the recess in the casing transversely to the axial direction.

31. The pump according to claim 25, wherein in the first fastening element is form-fittingly connected to the radial protective element and the first fastening element further comprises an elongate depression along its longitudinal extent, the elongate depression being adapted to receive the edge of the radial protective element and thereby produce a form-fitting connection to the radial protective element.

32. The pump according to claim 25, wherein: the first fastening element is connected to the casing by at least one screw, the at least one screw running through a casing wall of the casing to the first fastening element; the fastening element is movable in the direction of the edge of the protective element by the at least one screw, as a result of which the first fastening element exerts a clamping force on the radial protective element; and the longitudinal axis of the at least one screw is arranged orthogonally to the longitudinal extent of the first fastening element.

33. The pump according to claim 32, wherein the first fastening element is movable by the at least one screw between the fastening position, in which the first fastening element exerts a clamping force on the radial protective element, and a release position, in which the first fastening element does not exert any clamping force on the radial protective element.

34. The pump according to claim 25, wherein the first fastening element further comprises a bore which extends through the first fastening element along the longitudinal extent of the first fastening element, and wherein a fastening screw is disposed in the bore in the first fastening element, the fastening screw being detachably connected to the casing comprising a blind bore disposed in an axial casing inner wall having an internal thread.

35. The pump according to claim 25, wherein the first fastening element further comprises at least one elongate depression along its longitudinal extent adapted to receive an edge of the radial protective element and thereby to produce a form-fitting connection to the radial protective element, and the at least one elongate depression extends in an angle range of 0 to at most 5 relative to the longitudinal extent of the fastening element.

36. The pump according to claim 35, wherein the first fastening element further comprises a substantially circular cross-section with at least one notch therein formed by the at least one elongate depression.

37. The pump according to claim 36, wherein the first fastening element comprises two elongate depressions along its longitudinal extent each adapted to receive an edge of the radial protective element and thereby to produce a form-fitting connection to the radial protective element, and the first fastening element has two notches which are formed by the two elongate depressions arranged in mirror-symmetry.

38. The pump according to claim 25, further comprising a second fastening element extending in the axial direction from the first axial end of the pump interior along a second recess arranged in the casing inner wall, wherein the first fastening element and the second fastening element are arranged parallel and/or designed identically.

39. The pump according to claim 38, wherein the second fastening element is detachably connectable to the casing by a screw connection, and in a non-screwed state is movable out of the pump and out of the second recess in the casing in the axial direction, wherein the second fastening element is form-fittingly connected to the radial protective element, and wherein the first fastening element and the second fastening element each have an elongate depression along their respective longitudinal extents, each of the elongate depressions being adapted to receive an edge of the radial protective element and thereby to produce a form-fitting connection to the radial protective element.

40. The pump according to claim 25, wherein the pump has two radial protective elements, a first radial protective element being arranged in a first radial region of the pump chamber and a second radial protective element being arranged in a second radial region of the pump chamber, and wherein each of the first and second protective elements is fastened in the pump interior with two fastening elements.

41. The pump according to claim 25, wherein the pump is a lobe pump, and the displacement assembly comprises a first rotor rotatably mounted about a first rotational axis within the pump interior and a second rotor rotatably mounted about a second rotational axis within the pump interior, wherein the first rotor and the second rotor engage in one another between the first rotational axis and the second rotational axis, and wherein the first rotational axis and the second rotational axis are arranged parallel to the axial direction.

42. A fastening element for fastening a radial protective element within a pump interior of a pump for conveying a fluid comprising: a casing having a casing inner wall; a pump interior delimited by the casing inner wall; an inlet opening through which the fluid can be conveyed into the pump interior; an outlet opening through which the fluid can be conveyed out of the pump interior; and a displacement assembly arranged in and mounted movably relative to the pump interior and adapted to cause the fluid to be conveyed along a flow direction from the inlet opening to the outlet opening; wherein the radial protective element is arranged in the pump interior and lines at least one radial section of the pump interior, the radial protective element bearing against a radial section of the casing inner wall; and wherein the fastening element is rod-shaped and has a substantially circular cross section with at least one notch formed by an elongate depression adapted to receive an edge of the radial protective element.

43. The fastening element of claim 42, wherein the fastening element comprises two notches formed by two elongate depressions in mirror-symmetry, each notch adapted to receive the edge of a radial protective element.

44. A protective element system for lining a radial section of a pump interior of a pump for conveying a fluid comprising: a casing having a casing inner wall; a pump interior delimited by the casing inner wall; an inlet opening through which the fluid can be conveyed into the pump interior; an outlet opening through which the fluid can be conveyed out of the pump interior; and a displacement assembly arranged in and mounted movably relative to the pump interior and adapted to cause the fluid to be conveyed along a flow direction from the inlet opening to the outlet opening; at least two fastening elements comprising a notch formed by an elongate depression along their respective longitudinal extents; and at least one radial protective element comprising two edges which run in the axial direction adapted to be received in the elongate depressions of one of the two fastening elements.

45. The protective element system according to claim 44, wherein the notch formed by the elongate depression has an opening angle of less than 90 in cross section and/or the edges of the radial protective element have an edge angle of less than 90 in cross section, and wherein the opening angle and the edge angle are equal, whereby the edges of the radial protective element are arranged in the elongate depression to produce a form-fitting connection.

46. A method for fastening a radial protective element within a pump interior of a pump comprising the steps of: providing a pump comprising a casing with a casing inner wall, a pump interior delimited by the casing inner wall, an inlet opening through which a fluid can be conveyed into the pump interior, an outlet opening through which the fluid can be conveyed out of the pump interior, a displacement assembly arranged in the pump interior and moveably mounted relative to the pump interior and adapted to cause the fluid to be conveyed along a flow direction from the inlet opening to the outlet opening; arranging the radial protective element within the pump interior to line at least one radial section of the pump interior so that the radial protective element bears against a radial section of the casing inner wall; and introducing a fastening element into a recess in the casing, the recess running along the casing inner wall and extending in an axial direction running transversely to the flow direction so that the fastening element extends in the axial direction from a first axial end of the pump interior and the fastening element bears against an edge of the radial protective element.

47. The method according to claim 46, further comprising the steps of: connecting the fastening element to the casing by at least one screw, wherein the at least one screw runs through a casing wall of the casing to the fastening element and/or through a bore along a longitudinal extent of the fastening element.

48. The method according to claim 47, wherein the at least one screw runs through a casing wall of the casing to the fastening element, and wherein the fastening element is moved by the at least one screw in the direction of the edge of the protective element, as a result of which the fastening element exerts a clamping force on the radial protective element.

49. The method according to claim 46, wherein the fastening element extends in the axial direction along the entire pump interior from the first axial end of the pump interior to a second axial end of the pump interior opposite the first axial end, wherein the fastening element is form-fittingly connected to the radial protective element, and wherein the fastening element has an elongate depression along its longitudinal extent adapted to receive the edge of the radial protective element and thereby to produce a form-fitting connection to the radial protective element.

50. The method according to claim 46, further comprising the step of: pulling the fastening element out of the recess in the casing in the axial direction; removing the radial protective element from the pump interior in the axial direction; and/or removing the displacement assembly from the pump interior in the axial direction.

52. The use of a fastening element according to claim 42 in a lobe pump designed to convey liquids containing solids.

53. The use of a protective element system according to claim 44 in a lobe pump designed to convey liquids containing solids.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0082] Preferred exemplary embodiments are explained by way of example using the attached figures. In the figures:

[0083] FIG. 1 shows a schematic diagram of a pump and a removed radial protective element;

[0084] FIG. 2 shows a schematic diagram of a pump with an inserted radial protective element and a removed fastening element;

[0085] FIG. 3 shows a schematic diagram of a pump with inserted radial protective elements and an inserted fastening element, wherein two screws are not inserted;

[0086] FIG. 4 shows a schematic diagram of a pump with inserted radial protective elements and an inserted fastening element, with inserted screws;

[0087] FIG. 5 shows a schematic detail view of the view shown in FIG. 4 in the region of the lower radial protective element;

[0088] FIG. 6 shows a schematic diagram of a further embodiment of a pump with inserted radial protective elements and an inserted fastening element;

[0089] FIG. 7 shows a schematic diagram of a fastening element;

[0090] FIG. 8 shows a schematic detail view of a further embodiment of a pump in the region of the lower radial protective element; and

[0091] FIG. 9 shows a schematic diagram of an exemplary method sequence for a method for fastening a radial protective element within a pump interior of a pump.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0092] In the Figures, identical or substantially functionally identical or similar elements are indicated with the same reference signs.

[0093] FIG. 1 shows a schematic diagram of a pump 10 and a removed radial protective element 50a. The pump 10 is designed to convey a fluid, specifically to convey liquids containing solids. The pump 10 comprises a casing 20 with a casing inner wall, which has a lower radial section 21, an upper radial section, a first axial section 22 and a second axial section. The pump interior 24 is delimited by the casing inner wall.

[0094] Fluid can be conveyed through an inlet opening 31 into the pump interior 24 and from there to an outlet opening 32 along a flow direction 300. In the pump interior 24 there is a displacement assembly 40, which is mounted movably relative to the pump interior 24. In the exemplary embodiment shown here, the pump 10 is designed as a lobe pump and comprises a first rotor 41 and a second rotor 42, which are mounted rotatably and engage in one another. The fluid can be conveyed along a flow direction 300 from the inlet opening 31 to the outlet opening 32 by rotation of the rotors 41, 42. The rotors 41, 42 mesh with one another. In the exemplary embodiment shown here, the rotors 41, 42 are each designed with four lobes, but a different number and/or shape of the conveying elements can also be used. The rotors 41, 42 can be driven with a drive device 90 to convey the fluid.

[0095] In the pump interior 24 there is a radial protective element 50b for lining the upper radial section of the pump interior 24, the radial protective element 50b bearing against a radial section of the casing inner wall. This radial protective element 50b is fastened in the pump interior 24 by means of two fastening elements 60c, 60d, which each bear against an edge of the radial protective element 50b. A clamping force acts on the radial protective element 50b from each of the fastening elements 60c, 60d. The fastening elements 60c, 60d each extend along the casing inner wall from a first axial end of the pump interior 24 within recesses which run in the axial direction 200 or parallel to the axial direction 200 and thus orthogonally to the flow direction 300.

[0096] The fastening elements are fastened with screws 28b, 28d which run through the casing and are connected to the fastening elements 60b, 60d. The fastening elements 60a and 60c are likewise fastened by means of screws which run through the casing. By means of such screws, the fastening elements 60a, 60b, 60c, 60d can be moved in the direction of the radial protective elements 50a, 50b and thus exert a clamping force on the radial protective elements so that the radial protective elements can be fastened securely in the pump interior.

[0097] A radial protective element 50a is removed from the pump 10, for example for maintenance or before installation. The radial protective element 50a has two edges 51, 52 which are designed to produce a form-fitting connection to elongate depressions present in fastening elements which can be arranged in the recesses 26a, 26b.

[0098] A seal 80 is arranged on a casing side section 25. A side wall (not shown) is fastened to this casing side section 25 and the seal 80 in order to close the pump 10, that is, to close the pump interior 24. So that all the components shown in the pump interior 24 are visible, the pump is shown without a side wall in each of the states shown here. Such a side wall is of course fastened to the pump 10 during operation of the pump.

[0099] FIG. 2 shows a schematic diagram of the pump 10 shown in FIG. 1 with an inserted radial protective element 50a. The radial protective element 50a was inserted in the radial direction 200 starting from the state shown in FIG. 1 without the need to remove the rotors 41, 42 from the pump interior 24 for this purpose. The radial protective element 50a is arranged in the position shown in the pump interior 24 and is thus used to line the lower radial section of the pump interior 24. The radial protective element 50a bears against a radial section of the casing inner wall. The fastening element 60b is form-fittingly connected to an edge of the radial protective element 50a and thus holds the radial protective element in the position shown. The second fastening element 60a, which is likewise provided to fasten the radial protective element 50a, is not yet in the fastening position but outside the pump 10 in the position shown.

[0100] FIG. 3 shows a schematic diagram of the pump 10 shown in FIG. 1 and FIG. 2, but now, in contrast to FIG. 2, the last fastening element 60a, which is not yet inserted in the state shown in FIG. 2, is also inserted in the pump 10. In the state shown, both radial protective elements 50a, 50b and the four fastening elements 60a, 60b, 60c, 60d provided to fasten these protective elements are arranged in the pump. The fastening elements 60a, 60b, 60c, 60d are each arranged in a recess in the pump interior 24. Both the fastening elements 60a, 60b, 60c, 60d and the radial protective elements 50a, 50b can be moved out of the pump 10 in the axial direction 200 or parallel to the axial direction. In the position shown, the screws 28c and 28d are not connected to the fastening elements 60a, 60b and therefore in this case these two fastening elements are not yet fixed in the axial direction and these two fastening elements do not yet exert a clamping force on the radial protective element 50a.

[0101] FIG. 4 shows substantially the same diagram as FIG. 3, with the difference that now the two screws 28c and 28d are connected to the fastening elements 60a, 60b and therefore these two fastening elements are now fixed in the axial direction and these two fastening elements exert a clamping force on the radial protective element 50a.

[0102] FIG. 5 shows a schematic detail view of the view shown in FIG. 4 in the region of the lower radial protective element 50a. The fastening elements 60a, 60b are arranged in recesses in the casing 20 which extend along or parallel to the axial direction 200. The radial protective element 50a is fastened to the casing inner wall by the fastening elements 60a, 60b. The fastening elements 60a, 60b are arranged form-fittingly in the recesses 26a, 26b so that the fastening elements 60a, 60b cannot pass out of the recesses 26a, 26b in the direction of the rotor 41. Thanks to the form-fitting connection existing with the fastening elements 60a, 60b, the radial protective element 50a is also held and fastened securely.

[0103] FIG. 6 shows a schematic diagram of a further embodiment of a pump 10 with inserted radial protective elements 50a and an inserted fastening element 60a. In contrast to the exemplary embodiment shown in FIG. 1 to FIG. 5, in this case there are no screws connected to the fastening elements in order to fix the fastening elements and to exert a clamping force on the radial protective elements by means of the fastening elements.

[0104] Instead of screws connected to the fastening elements, for example one screw can be provided which is designed to clamp the radial protective element 50a. It is also possible for a further screw to be provided which is designed to clamp the radial protective element 50b. The radial protective elements 50a, 50b can then be clamped by means of this screw such that a clamping force is produced between the radial protective elements and the fastening elements. In this embodiment, screws which run through the casing to the fastening elements are not needed.

[0105] FIG. 7 shows a schematic diagram of a fastening element 60a, 60b, 60c, 60d. The fastening element 60a, 60b, 60c, 60d is rod-shaped and extends along its longitudinal extent 600. The fastening element 60a, 60b, 60c, 60d has two elongate depressions 61, 62, which run parallel to the longitudinal extent 600 of the fastening element. These elongate depressions 61, 62 can receive the edges of the radial protective elements and thus produce a form-fitting connection. The elongate depressions 61, 62 each have an acute angle 620 of less than 90, as shown schematically here.

[0106] The elongate depressions 61, 62 with the acute angle 620 preferably extend in an angle range of 0 to at most 5 relative to the longitudinal extent 600 of the fastening element 60a. When the recesses 26a, 26b in the casing of the pump 10 are not arranged parallel to the axial direction 200 but have an angle of a certain amount to the axial direction, the elongate depressions 61, 62 with the acute angle 620 preferably have an angle to the longitudinal extent 600 corresponding to the angle between the recess 26a, 26b and the axial direction. However, when the recesses 26a, 26b in the casing of the pump 10 are arranged parallel to the axial direction 200, the edges of the radial protective element 50a preferably have an angle which corresponds to the angle between the elongate depressions 61, 62 with the acute angle 620 and the longitudinal extent 600 of the fastening element 60a.

[0107] FIG. 8 shows a schematic detail view in the region of the lower radial protective element 50a of a further embodiment of a pump. The fastening elements 60a, 60b are arranged in recesses in the casing 20. The radial protective element 50a is fastened to the casing inner wall by the fastening elements 60a, 60b. The fastening elements 60a, 60b are arranged form-fittingly in the recesses so that the fastening elements 60a, 60b cannot pass out of the recesses 26a, 26b in the direction of the rotor 41. Thanks to the form-fitting connection existing with the fastening elements 60a, 60b, the radial protective element 50a is also held and fastened securely.

[0108] In the embodiment shown here, the longitudinal extent 600 of the fastening element 60a is not arranged parallel to the axial direction 200. Instead, the longitudinal extent 600 of the fastening element 60a in the embodiment shown here is arranged at angle of approximately 2 relative to the axial direction 200, as shown schematically here. The further fastening element 60a likewise does not run parallel to the axial direction 200 but parallel to the longitudinal extent of the other fastening element 60a. In the embodiment shown here, the recesses 26a, 26b correspondingly likewise do not extend parallel to the axial direction 200 but parallel to the longitudinal extent of the fastening elements 60a, 60b.

[0109] Depending on whether the depressions in the fastening element 60a run parallel to the axial direction or not parallel to the axial direction, the edges of the radial protective element 50a can correspondingly run parallel to the axial direction or not parallel to the axial direction.

[0110] Such an arrangement allows self-locking of the fastening elements 60, 60b in the recesses 26a, 26b and of the radial protective element 50a in the pump interior 24, in particular self-locking over a sloping plane.

[0111] A bore 68 is also provided, which extends through the fastening element 60a along the longitudinal extent 600. A fastening screw 69 can be fed through this bore 68 (a screw head of the screw is shown schematically here in FIG. 8). The fastening screw 69 can be screwed into an internal thread arranged in a blind hole in the casing inner wall on the side of the pump interior 24 opposite the opening in the casing 20, as a result of which the fastening element 60a can be fastened to the casing by means of the fastening screw 69.

[0112] The fastening screw 69 can also advantageously effect clamping between the fastening element 60a and the radial protective element 50a. Further screws for fastening the fastening element 60a and for applying a clamping force can then advantageously be omitted.

[0113] FIG. 9 shows a schematic diagram of an exemplary method sequence for a method 100 for fastening a radial protective element 50a within a pump interior 24 of a pump 10. The method 100 comprises the following steps:

[0114] In a step 110, providing a pump 10, in particular a pump as described here, the pump comprising a casing 20 with a casing inner wall 21, a pump interior 24 delimited by the casing inner wall 21, an inlet opening 31 through which fluid can be conveyed into the pump interior 24, an outlet opening 32 through which fluid can be conveyed out of the pump interior 24, a displacement assembly 40 which is arranged in the pump interior 24 and is mounted movably relative to the pump interior 24 and is designed to cause the fluid to be conveyed along a flow direction 300 from the inlet opening 31 to the outlet opening 32.

[0115] In a step 120, arranging a radial protective element 50a within the pump interior 24 in order to line at least one radial section of the pump interior 24 so that the radial protective element 50a bears against a radial section of the casing inner wall 21.

[0116] In a step 130, introducing a fastening element 60a into a recess 26a in the casing 20, said recess 26a running along the casing inner wall 21 and extending in an axial direction 200 preferably running transversely to the flow direction so that the fastening element 60a extends in the axial direction from a first axial end of the pump interior 24 and the fastening element 60a bears against an edge 51 of the radial protective element 50a. The fastening element 60a extends in the axial direction 200 along the entire pump interior 24 from the first axial end of the pump interior 24 to a second axial end of the pump interior 24 opposite the first axial end. The fastening element 60a is form-fittingly connected to the radial protective element 50a. And the fastening element 60a has along its longitudinal extent an elongate depression 61, which is designed to receive the edge of the radial protective element 50a and thereby to produce a form-fitting connection to the radial protective element 50a.

[0117] In a step 140, connecting the fastening element 60a to the casing 20 by means of at least one screw, wherein the at least one screw runs through a casing wall of the casing 20 to the fastening element 60a.

[0118] In a step 150, moving the fastening element 60a by means of the at least one screw in the direction of the edge of the radial protective element 50a, as a result of which the fastening element 60a exerts a clamping force on the radial protective element 50a.