Pump assembly with a lubrication and cooling system

Abstract

Pump arrangement for conveying a medium comprising a flow chamber (16) formed by a hydraulic housing (3) and a housing cover (4), a pump shaft (15) rotatably driven about a rotational axis (A), an impeller (18) attached to an end (17) of the pump shaft (15) located within the flow chamber (16), a bearing support (5), and a lubrication and cooling system with an oil circulation system formed in the bearing support (5), characterized in that a conveying element (24) is provided within the bearing support (5) between a first bearing (21) and a second bearing (23), which is formed on the pump shaft (15) or arranged as a separate element on the pump shaft (15), wherein the conveying element (24) comprises a ring element (49) with a first end face (50) and a second end face (51) opposite the first end face (50), and at least one blade (52) is arranged on an outer surface of the ring element (49).which extends diagonally from an area near the first front face (50) to an area near the second front face (51).

Description

[0001] The present invention relates to a pump arrangement comprising a flow chamber formed by a hydraulic housing and a housing cover and a bearing support according to claim 1.

[0002] Such pump configurations are used in a wide variety of applications for pumping fluids. When these pump configurations are required for high performance ranges, oil circulation lubrication is usually necessary to adequately lubricate and cool the bearings. This typically requires an external lubricant pump, a heat exchanger, and numerous hydraulic lines. If the lubricant pump fails, there is a risk that the main pump will also fail shortly afterward due to bearing damage.

[0003] From DE 1 156 493 A, a device for lubricating the bearings of an electric canned motor with a vertical shaft is known, in which the lubricant surrounds the rotor and the rotor body or rotor shaft includes means on at least one side for guiding the lubricant to the bearings when the rotor rotates. At least one elastic vane, the deflection of which depends on the rotational speed of the rotor as well as the fill factor and the type of lubricant, is arranged on the rotor body or rotor shaft as a means.

[0004] CN 201016366 Y discloses a vertical shaft device. This device comprises a vertical shaft, bearings clamped at both ends of the vertical shaft, a vertical tubular bearing seat arranged outside the bearing in a sleeve arrangement, a bearing stuffing box arranged on the bearing seat and the bearing in a stuffing box arrangement, a sealing ring located between the bearing stuffing box and the bearing pin shaft, and a sealing stuffing box arranged on the sealing ring in a stuffing box arrangement. A tubular lubricating oil channel in the tubular wall of the vertical bearing seat is formed in an axially penetrating arrangement, with an outlet at the lower end of the channel projecting through the inner side wall of the lower section of the vertical bearing seat and an outlet of the channel located in a lubricating cavity formed by the bearing seat and the vertical shaft.A tubular lubricating oil circuit is formed in the lower part of the upper bearing cover. One end of the circuit opening corresponds to the position of a tubular wall lubricating oil channel of the vertical bearing seat, and an opening at the other end of the circuit opening is located at the upper end of the bearing.

[0005] US 2,251,469 A describes a spindle with a tapered end, a stepped bearing in which the tip of the spindle is pivotally mounted, a neck bearing for the upper part of the tapered end with tapered upper and lower seats, a spring surrounding and spaced from the spindle and compressed between the bearings, a housing surrounding the bearings and the spring, and an oil pan that communicates with the pivot point of the spindle via a radial channel in the stepped bearing and with the housing via an axial channel in the stepped bearing.

[0006] From DE 11 2016 003 754 T5, a vertical bearing device is known, comprising a cylindrical pressure ring which rotates together with a rotating shaft element extending in the direction of gravity, a base plate opposite the lower end of the pressure ring, a thrust bearing section provided in a section in which the pressure ring and the base plate are opposite each other in an axial direction of the rotating shaft element, and which supports the rotating shaft element in the axial direction, a housing which surrounds the outer circumferential side of the rotating shaft element, which is formed in a container shape which integrally forms an oil chamber with the base plate for storing lubricating oil and divides the oil chamber into an upper oil chamber provided on the upper side and a lower oil chamber provided on the lower side in the direction of gravity.a sliding bearing section provided in a section in which the housing and the pressure ring face each other in a radial direction of the rotating shaft element, and which supports the rotating shaft element in the radial direction, and a cooling section having a lubricating oil passage section integral to the housing on the radially outer side of the housing and exposed to allow the flow of lubricating oil from the upper oil chamber to the lower oil chamber, and which cools the lubricating oil flowing from the upper oil chamber through the lubricating oil passage section to the lower oil chamber by means of air on the outer circumferential side of the housing.

[0007] US 2014 009 3201 A1 discloses a vertical motor with a thrust bearing, an oil pan in which the thrust bearing is located, the oil pan having a wall, and an oil deflector arranged in the oil pan, the oil deflector having a first end and a second end, the first end being located near the thrust bearing and the second end being located near the wall, the second end being positioned to form a gap between the oil deflector and an inner surface of the wall, the oil deflector being configured to direct oil taken up by the thrust bearing to the gap so that the oil can flow downwards along the inner surface of the wall.

[0008] The object of the present invention is to provide a pump arrangement with a lubrication and cooling system for the bearings of the pump arrangement that is as simple and reliable as possible.

[0009] This is achieved with a pump arrangement that has all the features of claim 1.

[0010] Further advantageous embodiments of the invention can be found in the respective dependent claims.

[0011] According to claim 1, the pump arrangement for conveying a medium comprises a flow chamber formed by a hydraulic housing and a housing cover, a pump shaft rotatably driven about a pivot axis, an impeller attached to an end of the pump shaft located within the flow chamber, and a bearing support. The invention is characterized by a lubrication and cooling system with an oil circulation system formed in the bearing support.

[0012] By incorporating internal oil circulation within the bearing support, an external lubricant pump, heat exchanger, and various hydraulic lines can be eliminated. The number of components is reduced by the internal lubrication and cooling system, thereby lowering the probability of failure. Bearing lubrication is also ensured during the pump shaft's overrun period, even in the event of a power outage.

[0013] According to a further development of the invention, a body element of the bearing support has inside a first bearing receptacle for receiving a first bearing and a second bearing receptacle for receiving a second bearing for supporting a pump shaft rotatable about an axis of rotation.

[0014] According to the invention, a conveying element is provided within the bearing support or body element between the first bearing and the second bearing, which is formed on the pump shaft or arranged as a separate element on the pump shaft. This allows for a space-saving design.

[0015] Advantageously, at least one chamber surrounding the pump shaft is provided near the first bearing mount in the bearing support. In plan view, the chamber essentially has the shape of a circular ring. The chamber can be designed to accommodate at least one oil filter.

[0016] As an advantageous alternative, at least one chamber can be divided into individual segments by partitions. In plan view, the individual segments of the chamber essentially have the shape of a segment of a circular ring. At least one oil filter can be installed in each individual segment.

[0017] The volume of a partition wall can be many times larger than the volume of a chamber segment. This significantly reduces the amount of oil required for oil circulation.

[0018] According to a preferred embodiment of the invention, a filling element surrounding the pump shaft is provided inside the bearing support. This allows the amount of oil required for oil circulation to be further and significantly reduced.

[0019] This is advantageous because it saves material if the filling body comprises an inner wall facing the pump shaft and an outer wall facing away from the pump shaft, forming a cavity.

[0020] For optimal oil circulation, in an advantageous design the packing element is arranged and dimensioned in its radial extent in such a way that a first annular space is created between the packing element and the pump shaft and a second annular space is created between the packing element and the outer wall of the bearing support.

[0021] In this way, optimal flow channels can be created within the bearing support or the hull element.

[0022] In a further advantageous embodiment, a first annular space is provided between the packing material and the pump shaft, wherein the packing material extends radially to the inner surface of the outer wall of the bearing support and at least one groove is provided on the outer surface of the outer wall of the packing material. This allows for a particularly stable position of the packing material.

[0023] In an advantageous embodiment, an annular projection extends into an area within the bearing cover, at least one recess being provided on the free end face of which. In this way, simple and effective flow channels can be created.

[0024] The fact that a guide device is attached to the free front face of the projection enables a loss-optimized deflection during oil circulation.

[0025] According to a preferred embodiment of the invention, a fan shroud is attached to the body element, with a fan wheel mounted on the pump shaft inside the fan shroud. The fan wheel generates an airflow that is deflected by the fan shroud and guided over the outside of the bearing support. This increases the heat transfer from the upper bearing support to the ambient air.

[0026] A particularly simple and effective design for the conveying element results when, according to the invention, the conveying element comprises a ring element. In this design, the ring element has a first end face and a second end face opposite the first end face.

[0027] It is advantageous if, according to the invention, at least one blade is arranged on the outer surface of the ring element, extending diagonally from a region near the first end face to a region near the second end face. This ensures that the blade(s) are designed in such a way that oil is conveyed in both directions of rotation. Thus, even in the event of a power failure, during which the direction of rotation of the pump shaft may reverse, sufficient oil circulation, and therefore lubrication of the bearings and cooling of the lubricant, is maintained.

[0028] Further advantages, details, and features will become apparent from the following description of the figures. It shows Fig. 1 the sectional view of a pump arrangement according to the invention with an internal lubrication and cooling system, Fig. 2 a partial view in cutaway representation of the pump arrangement according to Fig. 1, Fig. 3 the top view of a pump arrangement according to Fig. 1 inserted filler body and Fig. 4 a detailed representation of a pump arrangement according to Fig. 1 installed conveying element.

[0029] The Fig. 1 in conjunction with Fig. Figure 2 shows a pump assembly with a spiral casing 2, which is formed at least from a hydraulic housing 3 and a casing cover 4 that closes the hydraulic housing 3 on one side. The pump assembly further comprises a bearing support 5, which is formed at least from a first body element 6, a second body element 7, and a bearing cover 8. The pump assembly has a lubrication and cooling system with an oil circulation system formed in the bearing support 5.

[0030] The hydraulic housing 3 has an inlet opening at reference numeral 9 for drawing in a pumped medium and an outlet opening at reference numeral 10 for expelling the pumped medium. The housing cover 4 is located on the side of the hydraulic housing 3 opposite the inlet opening 9. The first body element 6 of the bearing support 5 is attached to the housing cover 4 on the side of the housing cover 4 facing away from the hydraulic housing 3. The second body element 7 is attached to the side of the first body element 6 facing away from the housing cover 4. The bearing cover 8 is, in turn, attached to the side of the body element 7 facing away from the first body element 6.

[0031] The first body element 6 of the bearing support 5 essentially comprises a circular cylindrical outer wall 11. The second body element 7 comprises an outer wall 12, which in the illustrated embodiment has a conical shape and tapers from the first body element 6 towards the bearing cover 8. Cooling fins 13 extending essentially in the axial direction are provided on the outer surface of the outer wall 12 of the bearing support 5 and of the second body element 7.

[0032] A fan shroud 14 is attached to the bearing support 5 or the second fuselage element 7 on the side facing away from the first fuselage element 6. The fan shroud 14 surrounds the bearing cover 8 and extends at least partially over the cooling fins 13 of the bearing support 5 or the second fuselage element 7.

[0033] The pump assembly has a pump shaft 15 that can be rotatably driven about a rotational axis A. This shaft extends from a flow chamber 16, which is limited by the hydraulic housing 3 and the housing cover 4, through an opening in the housing cover 4 and further through the first body element 6, the second body element 7, the bearing cover 8 and the fan cover 14.

[0034] An impeller 18 for pumping a medium is attached to an end 17 of the pump shaft 15 located inside the flow chamber 16. An end 19 of the pump shaft 15 opposite the shaft end 17 is connected to a drive device (not shown), for example a drive motor, preferably an electric motor.

[0035] In an area near the housing cover 4, the bearing support 5, and in an area near the second body element 7, the first body element 6, has a first bearing receptacle 20 for receiving a first bearing 21. A second bearing receptacle 22 for receiving a second bearing 23 is provided in an area near the bearing cover 8. The pump shaft 15, which is rotatable about the axis of rotation A, is supported by the two bearings 21 and 23.

[0036] Within the bearing support 5, a conveying element 24 is provided between the first bearing 21 and the second bearing 23, which is formed on the pump shaft 15 or is arranged or attached to the pump shaft 15 as a separate element.

[0037] Near the first bearing receptacle 20, at least one chamber 25 is provided in the bearing support 5 or in the first body element 6, which essentially surrounds the pump shaft 15. In the example shown, the chamber 25 is essentially bounded by a radial flange 26 of the second body element 7, with which it is attached to the first body element 6, a first wall 27 extending towards the axis of rotation A, the first bearing receptacle 20, which essentially corresponds to an axial second wall 28 extending parallel to the axis of rotation A, and by a portion of the outer wall 11. The radial first wall 27 connects the outer wall 11 to the first bearing receptacle 20 or to the second wall 28. At least one through-hole 29 is provided in the axial wall 28.

[0038] Inside the bearing support 5, or essentially inside the second body element 7, a filler body 30 surrounding the pump shaft 15 is provided. It extends from the first bearing receptacle 20 to the second bearing receptacle 22. The filler body 30 abuts the first body element 6 with a first end face 31. The filler body 30 has a substantially hollow cylindrical structure and surrounds the pump shaft 15. It comprises an inner wall 32 facing the pump shaft 15 and an outer wall 33 facing away from the pump shaft 15. In the illustrated embodiment, the outer wall 33 has a conical or frustoconical shape. The inner wall 32 and outer wall 33 form a cavity 34, and connecting webs 35 may be provided to connect the inner wall 32 to the outer wall 33 and to make the filler body 30 more stable.In the illustrated embodiment, the filling body 30 is arranged and dimensioned in its radial extent such that a first annular space 36 is formed between the filling body 30 and the pump shaft 15, and a second annular space 37 is formed between the filling body 30 and the outer wall 12 of the bearing support 5 or the second body element 7.

[0039] In the illustrated embodiment, the first annular space 36 is cylindrical. The second annular space 37 has a conical shape corresponding to the filler body 30 and the outer wall 12 of the second body element 7. The radial extent of the conveying element 24 is selected such that it can be arranged within the first annular space 36.

[0040] As in the Fig. As shown in Figure 2, the end face 31 of the filler body 30 facing the first hull element 6 is sealed fluid-tight by means of an annular cover 38, so that no oil can penetrate into the cavity 34.

[0041] In the area of ​​the second bearing receptacle 22, which is connected to the outer wall 12 by means of a disc-like connecting element 39, a first annular projection 40 extends axially into the interior of the second body element 7, against which a second end face 41 of the filler body 30, opposite the first end face 31, comes into contact. The connecting element 39 is integrally connected to the outer wall 12 and to the second bearing receptacle 22. At least one through-bore 42 extends through the connecting element 39.

[0042] In the opposite direction to the annular projection 40, a second annular projection 43 extends into an area located within the bearing cover 8. At least one recess 44 is provided on the free end face of the annular projection 43. The fastening lug 45 of a retaining ring for securing the second bearing 23 is positioned in the at least one recess 44. A guide element 46 is also attached to the free end face of the annular projection 43. The guide element 46 is annular in shape and surrounds the pump shaft 15. In cross-section, the guide element 46 has a dome-like shape.

[0043] Inside the fan housing 14, a fan wheel 47 is attached to the pump shaft 15.

[0044] In an alternative embodiment of the filler body 30, as described in the Fig. As shown in Figure 3, the first annular space 36 is provided between the filling body 30 and the pump shaft 15; however, the filling body extends radially to the inner surface of the outer wall 12 of the bearing support 5, wherein at least one of the Fig. The grooves 48 shown in the diagram are provided on the outside of the outer wall 33 of the filler body 30. For better clarity, the diagram shows the grooves 48 on the outside of the outer wall 33 of the filler body 30. Fig. 3 also shows the cut pump shaft 15 and the first annular space 36.

[0045] In an alternative embodiment of the first body element 7, the chamber 25 can be divided into individual segments by further partition walls (not shown) extending from the outer wall 11 to the first bearing receptacle 20 and from the first wall 27 to the cover 38. Each segment has a through-hole 29 in the axial wall 28.

[0046] Will the in the Fig. In the embodiment shown in Figure 3, the filler body 30 is combined with a second body element 7 segmented into several chambers 25, and at least one groove 38 opens into one of the chambers 25. If necessary, appropriate means for mechanical coding for the unambiguous alignment or positioning of the filler body 30 on the first body element 6 must be provided.

[0047] The Fig. Figure 4 shows the conveying element 24 in detail. The conveying element 24 comprises a ring element 49 with a first end face 50 and a second end face 51 opposite the first end face 50. At least one blade 52 is arranged on the outer surface of the ring element 49. In the illustrated embodiment, four identical blades 52 are arranged evenly distributed over the outer surface. The blades 52 extend diagonally from a region near the first end face 50 across a segment of the ring to a region near the second end face 51.

[0048] In the Fig. In the example shown in Figure 4, the conveying element 24 is designed in a screw-like form, with the blades 52 arranged on the ring element 49 each forming approximately one quarter of a thread. In an alternative embodiment, the ring element can extend in the axial direction such that at least one complete thread is present on the ring element 49.

[0049] In the company, the one in the Fig. 1 and Fig. 2 The area of ​​the pump assembly shown is separated from the flow chamber 16 by the first body element 6 and a sealing assembly 53 arranged in the first body element 6 and filled with oil. The filling of the pump assembly, in particular the bearing support 5, with oil takes place during the process shown in the Fig. 1 or the Fig. In the embodiment of the pump arrangement shown in Figure 2, the oil flows through an opening (not shown) in the bearing cover 8, which can be sealed fluid-tight by suitable means. Advantageously, the oil level lies above the guide element 46. The pumping element 24 circulates the oil in the bearing support 5. The pumping element 24 is arranged in the bearing support 5 between the first bearing 21 and the second bearing 23. It pumps the oil in the first annular space 36 along the pump shaft 15, upwards in the illustrated embodiment, towards the second bearing 23, and forces the oil through the bearing 23.

[0050] After the oil has passed the bearing 23, it is deflected by the guide device 46, moves away from the pump shaft 15 and flows through the at least one recess 44 and the through-bore 42 into the second annular space 37 and into the chamber 25 or into one of the segments of the chamber 25. When using a filler element 30 according to the Fig.3. The oil flows through at least one groove 38 into chamber 25 or into one of the segments of chamber 25. Optionally, oil filters (not shown) may be provided in chamber 25 or in the segments of chamber 25. The oil filters can be installed via the openings 54 provided in the outer wall 11 of the first body element 6. The openings 54 are sealed fluid-tight with a cover 55.

[0051] The oil is then drawn from the pumping element 24 through the through-bore(s) 29 towards the pump shaft 15 and through the first bearing 21. This is a pressureless oil circuit. Therefore, a seal between the bearing cap 8 and the pump shaft 15 is not required in the vertical installation position of the bearing support 5 shown.

[0052] During operation, heat is generated by bearing friction and flow losses. As the oil flows through the bearings 21 and 23, a large portion of this heat is absorbed by the oil. Most of the heat absorbed by the oil is then dissipated to the environment via the bearing support 5 as it flows through the outer annular space 37. To increase the heat flow to the environment and thus lower the temperature level in the bearing support 5, the bearing support 5, or rather the second body element 7, preferably has a plurality of cooling fins 13 on the outer surface of its outer wall 12. The fan 47, arranged on the pump shaft 15, generates an airflow that is directed through the fan housing 14 over the area of ​​the bearing support 5 equipped with the fins 13. This increases the heat transfer between the bearing support 5 and the ambient air, further improving the cooling effect.

Claims

[1] Pump arrangement for conveying a medium comprising a flow chamber (16) formed by a hydraulic housing (3) and a housing cover (4), a pump shaft (15) rotatably driven about a rotary axis (A), an impeller (18) attached to an end (17) of the pump shaft (15) located inside the flow chamber (16), a bearing support (5) and a lubrication and cooling system with an oil circulation system formed in the bearing support (5), characterized by, that within the bearing support (5) between a first bearing (21) and a second bearing (23) a conveying element (24) is provided, which is formed on the pump shaft (15) or is arranged as a separate element on the pump shaft (15), wherein the conveying element (24) comprises a ring element (49) with a first end face (50) and a second end face (51) opposite the first end face (50) and at least one blade (52) is arranged on an outer surface of the ring element (49), which extends diagonally from a region near the first end face (50) to a region near the second end face (51). [2] Pump arrangement according to claim 1, characterized by , that the bearing support (5) has inside a first bearing receptacle (20) for receiving the first bearing (21) and a second bearing receptacle (22) for receiving the second bearing (23) for supporting the pump shaft (15) rotatable about the axis of rotation (A). [3] Pump arrangement according to claim 2, characterized by , that near the first bearing receptacle (20) in the bearing support (5) at least one chamber (25) is provided which essentially surrounds the pump shaft (15). [4] Pump arrangement according to claim 3, characterized by , that the chamber (25) is divided into individual segments by partition walls. [5] Pump arrangement according to one of the preceding claims, characterized by , that inside the bearing support (5) a filling body (30) surrounding the pump shaft (15) is provided. [6] Pump arrangement according to claim 5, characterized by , that the packing body (30) comprises an inner wall (32) facing the pump shaft (15) and an outer wall (33) facing away from the pump shaft (15), which form a cavity (34). [7] Pump arrangement according to one of claims 5 or 6, characterized by, that the packing body (30) is arranged and dimensioned in its radial extent such that a first annular space (36) is formed between the packing body (30) and the pump shaft (15) and a second annular space (37) is formed between the packing body (30) and an outer wall (12) of the bearing support (5). [8] Pump arrangement according to one of claims 5 or 6, characterized by , that a first annular space (36) is provided between the filler body (30) and the pump shaft (15) and that the filler body (30) extends in a radial direction to the inner surface of an outer wall (12) of the bearing support (5), wherein at least one groove (48) is provided on the outside of the outer wall (33) of the filler body (30). [9] Pump arrangement according to one of the preceding claims, characterized by , that an annular projection (43) extends into an area within a bearing cover (8) on the free end face of which at least one recess (44) is provided. [10] Pump arrangement according to claim 9, characterized by , that a guide device (46) is attached to the free front face of the projection (43). [11] Pump arrangement according to one of the preceding claims, characterized by , that a fan hood (14) is attached to the bearing support (5), wherein a fan wheel (47) is attached to the pump shaft (15) inside the fan hood (14).

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