EP4343152A1 - Vertical turbine pump - Google Patents

Abstract

The invention relates to a vertical turbine pump (1) with a riser pipe (5) extending along an axis (4), a motor shaft (6) arranged in the riser pipe (5), a motor shaft arranged at an upper riser pipe end (9) and the motor shaft (6) driving motor (12), an impeller (8) arranged on an opposite, lower riser pipe end (7) and driven by the motor shaft (6) for conveying a fluid into the riser pipe (5), and a pressure-side, on a first The manifold end (14) facing the impeller (8) is connected to the riser pipe (5) and has a curvature continuously away from the axis (4) and an outlet (16) at an opposite second manifold end (15) for the conveyed fluid , wherein a radial diameter as the height of the manifold (3) initially decreases from the first manifold end (14) towards the second manifold end (15) and then increases.

Description

Technical area

The invention relates to a vertical turbine pump with a riser pipe extending along an axis, a motor shaft arranged in the riser pipe, a motor arranged at an upper riser pipe end and driving the motor shaft, an impeller for conveying arranged at an opposite, lower riser pipe end and driven by the motor shaft a fluid into the riser pipe, and a tubular bend connected to the riser pipe at a first manifold end facing the impeller with an outlet at an opposite second manifold end for the conveyed fluid.

Background of the invention

Vertical turbine pumps, also known as vertical turbines, semi-axial pumps or borehole pumps, are vertical pumps that are used, for example, for wells and boreholes and are used in particular in industrial environments. Delivery heights of, for example, 40 to 100 meters can be achieved by connecting several impellers in series.

Vertical turbine pumps typically include a motor mounted on some type of base or motor mount. A motor shaft can either be attached directly to the motor or coupled to it, and extends downward toward an impeller through a column bracket or a vertical tube assembly, also called a riser. The impeller contains several impeller blades that rotate with the motor and the motor shaft, thus conveying the fluid into the riser pipe below.

For example describes EP 2606238 A1 a vertical pump elongated along a longitudinal direction, having a motor and rotatably coupled to the motor Motor shaft that drives an impeller. The fluid conveyed vertically upwards by the impeller into a riser pipe exits the riser pipe in the horizontal direction above a base plate through a tubular elbow.

In the known vertical turbine pumps, the motor is arranged above the base plate, while in the mentioned delivery heights of, for example, 40 to 100 meters, the impeller is arranged at a corresponding distance below the base plate. In the event of a defect or maintenance, it is extremely time-consuming to pull the riser pipe with the impeller out of the borehole.

In addition, the known elbows are a manufactured construction in which round pieces of pipe are welded together, which is disadvantageous. The manifold is usually welded to the so-called 'delivery bend & motor stool', DBMS, housing, which is arranged on the base plate and at the upper end of which the often very heavy motor is provided. The seal housing provided on an upper side of the curved elbow, through which the motor shaft enters the riser pipe, essentially determines the vertical height of the DBMS housing. Specifically, in the known embodiments, the welded construction of the manifold leads to a large distance between the seal housing and the base plate and thus to a large height of the DBMS housing, which has a negative effect on the rigidity and natural frequency of the vertical turbine pump.

A pressure and often also a flow of the pumped fluid are usually measured at an outlet of the manifold. The welded design of the manifold regularly leads to an angular shape within the manifold. This angular shape and a possible flow restriction through the seal housing cause turbulence at the outlet. In addition to affecting the hydraulic properties of the vertical turbine pump, the turbulence makes measurement very difficult and often leads to incorrect readings.

Description of the invention

Based on this situation, it is an object of the present invention to provide a vertical turbine pump with a manifold, a corresponding use and a corresponding method, which is not characterized by the disadvantages described above. In particular, it is an object of the present invention to provide a vertical turbine pump with a manifold, which is improved over the designs known from the prior art by improved operational stability, easier maintenance, improved measurement accuracy of a sensor provided at the outlet and/or overall hydraulic properties.

The object of the invention is achieved by the features of the independent claims. Advantageous refinements are specified in the subclaims.

• einem sich entlang einer Achse erstreckenden Steigrohr,
• einer in dem Steigrohr angeordneten Motorwelle,
• einem an einem oberen Steigrohrende angeordneten und die Motorwelle antreibenden Motor,
• einem an einem entgegengesetzten, unteren Steigrohrende angeordneten und von der Motorwelle angetriebenen Laufrad zum Fördern eines Fluids in das Steigrohr, und
• einem druckseitigen, an einem ersten dem Laufrad zugewandten Krümmerende mit dem Steigrohr verbundenen Krümmer aufweisend eine Krümmung stetig weg von der Achse und einen Auslass an einem entgegensetzten zweiten Krümmerende für das geförderte Fluid, wobei
• sich ein radialer Durchmesser als Höhe des Krümmers von dem ersten Krümmerende hin zu dem zweiten Krümmerende zunächst verringert und daraufhin vergrößert.

Accordingly, the task is solved using a vertical turbine pump

• a riser pipe extending along an axis,
• a motor shaft arranged in the riser pipe,
• a motor arranged at an upper end of the riser pipe and driving the motor shaft,
• an impeller arranged at an opposite, lower end of the riser pipe and driven by the motor shaft for conveying a fluid into the riser pipe, and
• a pressure-side manifold connected to the riser pipe at a first manifold end facing the impeller, having a curvature continuously away from the axis and an outlet at an opposite second manifold end for the conveyed fluid, wherein
• A radial diameter as the height of the manifold initially decreases from the first manifold end to the second manifold end and then increases.

An essential aspect of the proposed solution, which will be described in more detail below, is that the manifold can be designed in the manner of a 'cobra head', namely the height of the manifold between the two manifold ends is reduced. This allows the distance between the motor and a base plate to be reduced, which has a positive effect on the stiffness and natural frequency, and of course also on the manufacturing costs of the vertical turbine pump. In other words, the proposed vertical turbine pump is less susceptible to vibration, which improves the operational stability of the vertical turbine pump. The lower vertical height makes the vertical turbine pump easier to maintain or repair, as it is easier to accept the engine and/or the manifold, particularly above ground, if necessary. Furthermore, the manifold with a reduced height between the two manifold ends reduces possible turbulence at the outlet, which has a positive effect on the measurement accuracy of pressure and flow of a sensor provided at the outlet. Finally, the proposed manifold also improves the hydraulic properties of the vertical turbine pump.

Vertical turbine pumps are usually used to describe vertical pumps that can be used for wells or boreholes. The riser pipe can have an outside diameter of up to a few centimeters, so that the vertical turbine pump is often significantly longer axially along the axis than it is radially wide. The riser pipe regularly extends mostly below the base plate on which the vertical turbine pump can be attached. In this respect, the motor and the manifold are preferably arranged above the base plate in such a way that the riser pipe is connected to the first manifold end in a fluid-tight manner just above or on the base plate and the motor is arranged vertically above the manifold. The riser pipe is preferably made of metal and/or has a circular or circular cross section.

The motor shaft preferably extends in the axial direction along the center line of the riser pipe and, for this purpose, passes through the tubular elbow on an outside in an axial extension of the riser pipe. An opening in the manifold can be provided on this outside, through which the motor shaft passes. A seal, in particular a radial seal, is preferably provided, which is arranged in the opening and seals the motor shaft in a fluid-tight manner from the manifold in a radially circumferential manner. With regard to the feature that the height of the manifold initially decreases and then increases from the first manifold end to the second manifold end, it is assumed within the scope of the disclosure that the opening and/or the seal has no influence on the height of the manifold. This means that even if the seal protrudes into the manifold, the protruding part is not to be understood in the sense of this feature and does not affect the height of the manifold.

The riser pipe and/or the vertical turbine pump preferably has an axial longitudinal extent of ≥ 10, 20, 30, 40 m, or more. At the lower end of the riser pipe, a plurality of impellers arranged axially one behind the other can be provided, through which the fluid is conveyed into the riser pipe and axially upwards towards the manifold. The second riser pipe end is preferably connected to the first manifold end in a fluid-tight manner, in particular screwed. In this respect, the motor can be provided axially offset from the upper end of the riser pipe, as described below.

The elbow is preferably designed as a pipe bend or like a pipe bend and/or has a circular arc-like or elliptical shape in side view. The elbow preferably extends over a circular arc or in the shape of a circular arc over 90°, although other values such as 80° or 100° are also possible. In this respect, the feature that the elbow has a curvature continuously away from the axis does not mean that the elbow initially extends in a direction opposite to the second end of the elbow, for example has an S-shaped shape, but rather linearly and / or continuously, especially in side view, circular arc-like or elliptical, extending continuously further away from the axis or the riser pipe with respect to its radial center line. Furthermore, the feature that the manifold has a curvature continuously away from the axis is to be understood in particular as synonymous with the feature that the manifold extends continuously away from the axis with respect to its radial, in particular circular arc-like, center line. In the case of an elliptical shape, in particular extending over 90°, the minor axis of the ellipse preferably runs parallel to the axis and/or the major axis runs horizontally.

The feature that the radial diameter as the height of the manifold initially reduces and then increases from the first manifold end to the second manifold end means in particular that at at least one position between the first manifold end and the second manifold end the height of the manifold is less than the height at the first manifold end and/or at the second manifold end. In side view the manifold has a particularly 'flattened' shape. In particular, the manifold can have a 'dimpled' shape on its outside when viewed from the side, with the height at the 'dent' being reduced to a maximum. The radial diameter is understood to mean, in particular, a radial inner diameter of the elbow, which defines a clear height in the elbow through which the fluid can flow. In this respect, when one speaks of a reduction or increase in the diameter, the outside diameter can also be meant in addition to the inside diameter.

According to a preferred development, the radial diameter initially decreases and then increases steadily. The radial diameter can decrease and/or increase continuously, although it is also possible for the radial diameter to remain constant in some areas in order to subsequently decrease and/or increase. Particularly preferably, the radial diameter does not decrease and/or increase in a sudden manner, but in particular linearly.

According to a further preferred embodiment, the radial diameter between the first manifold end and the second manifold end decreases compared to the radial diameter at the first manifold end and/or at the second manifold end by ≥10%, 20%, 30%, 40%, 50% or 60% reduced. This means that, for example, in the middle or approximately in the middle between the first manifold end and the second manifold end, the height of the manifold can be 40% of the height at the first manifold end and/or at the second manifold end, with the height decreasing linearly up to the minimum height and then can increase linearly again.

According to a particularly preferred embodiment, an axial diameter as the width of the manifold initially increases from the first manifold end to the second manifold end and then decreases. This means in particular that at at least one position between the first manifold end and the second manifold end, the width of the manifold is greater than the width at the first manifold end and/or at the second manifold end. In plan view, in particular in the direction of a radius of the elbow, the elbow has a widespread shape, particularly in the middle of its extent. In particular, the manifold can again have a bulge when viewed from above have, with the width being increased to the maximum at the axial 'bump'. The axial diameter is understood to be, in particular, an axial inner diameter of the elbow, which defines a clear width within the elbow through which the fluid can flow.

According to yet another preferred embodiment, the axial diameter initially increases steadily and then decreases steadily. The axial diameter can increase and/or decrease continuously, although it is also possible for the axial diameter to remain constant in some areas in order to subsequently increase and/or decrease. Particularly preferably, the axial diameter does not increase and/or decrease suddenly, but rather linearly.

According to another preferred embodiment, the axial diameter between the first manifold end and the second manifold end increases by ≥ 10%, 20%, 30%, 40%, 50% compared to the radial diameter at the first manifold end and/or at the second manifold end. 60%, 70% or 80%. This means that, for example, in the middle or approximately in the middle between the first manifold end and the second manifold end, the width of the manifold can be 180% of the width at the first manifold end and/or at the second manifold end, with the width increasing linearly up to the maximum height and then can decrease linearly again.

According to a preferred development, the manifold is designed in the manner of a cobra head, particularly in perspective view. As is known, a cobra head is characterized by a wider shape with a lower height than a cobra body with a circular cross-section, i.e. in particular by a height of the manifold, which initially decreases from the first manifold end towards the second manifold end and then increases, as well as by a width of the manifold, which initially increases and then decreases from the first manifold end to the second manifold end. In contrast to other known cobra heads, the cobra head in question does not have an S-shaped shape when viewed from the side, but rather always extends away from the axis with respect to its center line. It is precisely through such a design in the manner of a cobra head that the above-described features can be achieved Achieve advantages, namely arranging the manifold particularly effectively close to the base plate, so that the deeper vertical arrangement of the engine that can be achieved thereby improves the rigidity and the hydraulic properties of the vertical turbine pump and reduces the susceptibility to vibration.

In a further preferred embodiment it is provided that a cross section of the manifold is always the same size in the course between the first manifold end and the second manifold end. This means that if the height of the manifold decreases between the first manifold end and the second manifold end, the width of the manifold increases accordingly.

According to another preferred embodiment, a drive lantern with a coupling provided between the motor and the motor shaft is arranged between the engine and the manifold, the drive lantern and the manifold, including a manifold housing preferably having the manifold, being designed in two parts. The drive lantern and/or the manifold housing preferably have a rectangular cross section in plan view and/or are designed like a cuboid. The manifold housing is preferably mounted in a stationary manner on the base plate or the like, in particular screwed. The riser pipe preferably extends vertically and/or axially below the base plate and is preferably also mounted in a stationary manner, in particular screwed, to the base plate and/or the manifold housing. The drive lantern is preferably fixed in place in an axial extension of the riser pipe between the manifold housing and the engine, in particular screwed to the manifold housing and the engine.

According to a further preferred development, the bend has a constantly changing elliptical cross-section between the first bend end, which has a particularly circular cross-section, and the second bend end, which has a particularly circular cross-section. Preferably, the minor axis of the elliptical cross-section extends in the radial direction relative to the bend as the height of the bend, while the major axis of the elliptical cross-section extends orthogonally thereto as the width of the bend. According to another preferred In this embodiment, the first bend end and the second bend end have an equally large, in particular circular, cross-section.

According to a further preferred development, a radius of a radial inner manifold edge increases in particular continuously from the first manifold edge towards the second manifold edge. In other words, the curvature of the radial inner manifold edge, i.e. in particular also of the manifold, flattens or decreases in particular steadily from the first manifold edge towards the second manifold edge. In this way, the manifold can be designed with a low height relative to the axis of the riser pipe, which moves the engine closer to the base plate, so that vibrations are reduced, which leads to more stable operation of the vertical turbine pump.

According to another preferred embodiment, the manifold is made of gray cast iron. The manifold housing including the manifold is preferably made of gray cast iron. Gray cast iron is understood to mean in particular gray cast iron, i.e. a group of iron-carbon alloys with a high proportion of carbon, in particular > 2%, the carbon being in the form of graphite. In addition, silicon can be included to improve castability, as well as other alloy components such as manganese, chromium or nickel. Compared to welded manifolds known from the prior art, the proposed manifold and thus the vertical turbine pump can be manufactured much more simply and cost-effectively.

• ein sich entlang einer Achse erstreckendes Steigrohr,
• eine in dem Steigrohr angeordnete Motorwelle,
• einen an einem oberen Steigrohrende angeordneten und die Motorwelle antreibenden Motor, und
• ein an einem entgegengesetzten, unteren Steigrohrende angeordneten und von der Motorwelle angetriebenen Laufrad zum Fördern eines Fluids in das Steigrohr, wobei
• der Krümmer an einem ersten dem Laufrad zugewandten Krümmerende mit dem Steigrohr verbunden ist, eine Krümmung stetig weg von der Achse und an einem entgegensetzten zweiten Krümmerende ein Auslass für das geförderte Fluid aufweist, und
• sich ein radialer Durchmesser als Höhe des Krümmers von dem ersten Krümmerende hin zu dem zweiten Krümmerende zunächst verringert und daraufhin vergrößert.

The object of the invention is further achieved by using a tubular manifold for a vertical turbine pump

• a riser pipe extending along an axis,
• a motor shaft arranged in the riser pipe,
• a motor arranged at an upper end of the riser pipe and driving the motor shaft, and
• an impeller arranged at an opposite, lower end of the riser pipe and driven by the motor shaft for conveying a fluid into the riser pipe, wherein
• the manifold is connected to the riser pipe at a first manifold end facing the impeller, has a curvature continuously away from the axis and has an outlet for the conveyed fluid at an opposite second manifold end, and
• A radial diameter as the height of the manifold initially decreases from the first manifold end to the second manifold end and then increases.

Further refinements and advantages of use arise for the person skilled in the art in analogy to the vertical turbine pump described above.

Brief description of the drawings

The invention is explained in more detail below with reference to the accompanying drawings using preferred exemplary embodiments.

Fig. 1

eine schematische Schnittansicht einer vertikalen Turbinenpumpe mit einem Krümmergehäuse aufweisend einen Krümmer gemäß einem bevorzugten Ausführungsbeispiel der Erfindung,

Fig. 2

eine schematische Schnittansicht des Krümmergehäuses aufweisend den Krümmer gemäß dem bevorzugten Ausführungsbeispiel der Erfindung,

Fig. 3

eine schematische Seitansicht des Krümmergehäuses aufweisend den Krümmer mit eine Schnittlinie B-B gemäß dem bevorzugten Ausführungsbeispiel der Erfindung,

Fig. 4

eine schematische Schnittansicht des Krümmergehäuses aufweisend den Krümmer durch die Schnittlinie B-B gemäß dem bevorzugten Ausführungsbeispiel der Erfindung,

Fig. 5

eine schematische Seitansicht des Krümmergehäuses aufweisend den Krümmer mit verschiedenen Schnittlinien C-C bis M-M gemäß dem bevorzugten Ausführungsbeispiel der Erfindung, und

Fig. 6

schematische Schnittansichten des Krümmers durch die Schnittlinien C-C bis M-M gemäß dem bevorzugten Ausführungsbeispiel der Erfindung,

Show in the drawings

Fig. 1

a schematic sectional view of a vertical turbine pump with a manifold housing having a manifold according to a preferred embodiment of the invention,

Fig. 2

a schematic sectional view of the manifold housing showing the manifold according to the preferred embodiment of the invention,

Fig. 3

a schematic side view of the manifold housing showing the manifold with a section line BB according to the preferred embodiment of the invention,

Fig. 4

a schematic sectional view of the manifold housing showing the manifold through the section line BB according to the preferred embodiment of the invention,

Fig. 5

a schematic side view of the manifold housing showing the manifold with various section lines CC to MM according to the preferred embodiment of the invention, and

Fig. 6

schematic sectional views of the manifold through the section lines CC to MM according to the preferred embodiment of the invention,

Detailed description of the exemplary embodiments

Fig. 1 shows a schematic sectional view of a vertical turbine pump 1 with a manifold housing 2 having a manifold 3 according to a preferred embodiment of the invention.

The vertical turbine pump 1 has a riser pipe 5 that extends along an axis 4 and has a circular outer cross section and has a plurality of interconnected segments. In the middle of the metal riser 5, a motor shaft 6 extends along the axis 4 and along the entire length of the riser 5 in such a way that a free space is formed radially around the motor shaft 6 between it and the riser 5, through which the vertical turbine pump 1 pumped fluid rises axially upwards. For this purpose, several impellers 8 arranged axially one above the other are provided at a lower end of the riser pipe 7, which are driven by the motor shaft 6, suck in the fluid and convey it into the free space.

The riser pipe 5 is attached with its upper riser pipe end 9 to a base plate 10, so that the riser pipe 5 extends vertically downwards away from the base plate 10. Above the base plate 5, vertically or in the direction of the axis 4, the manifold housing 2 is connected, which in turn is axially connected by a drive lantern 11 and finally a motor 12 driving the motor shaft 6. A clutch 13 is arranged in the drive lantern 11 and is connected between the motor 12 and the motor shaft 6. The manifold housing 2 and the drive lantern 11 are designed in two parts and screwed together. The upper riser pipe end 9 is fluid-tight a first manifold end 14 of the manifold 3 facing the impeller 8.

Now referring to Fig. 2 , which shows a schematic sectional view of the manifold housing 2 having the manifold 3 according to the preferred exemplary embodiment of the invention, the manifold 3 has an outlet 16 for the conveyed fluid at a second manifold end 15 arranged opposite the first manifold end 14. The tubular elbow 3 redirects the conveyed fluid from the vertical to the horizontal, so that cross-sectional surfaces at the first elbow end 14 and the second elbow end 15 are arranged offset from one another by 90 °. For this purpose, the inner cross-sectional areas of the two manifold ends 14, 15 are, on the one hand, the same size and, on the other hand, circular. Regarding his in Fig. 3 shown radial center line 17 of the manifold 4, designated in the one showing the manifold 3 in a schematic side view Fig. 3 as a cutting line BB, the manifold 3 extends from the first manifold end 14 steadily away from the axis 4 towards the second manifold end 15.

Again referring to Fig. 2 , a radial inner diameter as the inner height of the manifold 3 initially decreases steadily from the first manifold end 14 towards the second manifold end 15, in order to then steadily increase again. Compared to the radial inner diameter at the first manifold end 14 and the second manifold end 15, the radial inner diameter of the manifold 3 is reduced by 40% approximately in the middle between the first manifold end 14 and the second manifold end 15. Alternatively, other ratios such as 30%, 50%, 20% or 60% are possible.

This reduction occurs regardless of the length extending along axis 4 and in Figs. 2 ff. Motor shaft 6, not shown, which corresponds to an outer wall of the manifold 3 Fig. 2 Opening shown, also called cut-out, enters the manifold 3 in the area of the axis 4. The motor shaft 6 is sealed in this opening from the outer wall by means of a seal, not shown, which seal can protrude into the manifold 3, but is not considered a reduction in the radial inner diameter in the sense of the feature described above.

Besides this how out Fig. 2 recognizable flattening of the manifold 3 on the outer wall thereof between the first manifold end 14 and the second manifold end 15, an axial inner diameter as the inner width of the manifold 3 initially increases steadily from the first manifold end 14 towards the second manifold end 15 and then steadily decreases again , how out Fig. 4 recognizable. Fig. 4 shows a schematic sectional view of the manifold housing 2 having the manifold 3 through the section line BB according to the preferred exemplary embodiment of the invention, i.e. along the center line 17 of the manifold 3. Compared to the axial inner diameter at the first manifold end 14 and the second manifold end 15 is the width of the manifold 3 enlarged by 30% approximately in the middle between the first manifold end 14 and the second manifold end 15. Alternatively, other ratios such as 20%, 40%, 10% or 50% are possible.

In this way, the manifold 3 is designed in the manner of a cobra head, i.e. along its arcuate extension from the first manifold end 14 to the second manifold end 15, in side view, on the one hand flattened and on the other hand, in plan view, widened. Specifically, the manifold 3, as shown in the sections Fig. 6 according to the cutting planes of the Fig. 5 can be seen, between the first manifold end 14, which has the circular cross section, shown as section MM with a different scaling compared to at least section CC, and the second manifold end 15, which also has the circular cross section, section DD, a continuous between the cuts LL, shown without cut- out for the motor shaft 4, towards DD changing elliptical cross section, first from round to elliptical and then back to round.

Coming back to again Fig. 2 In order to obtain the flattened design in side view, the manifold 3 is further designed such that a radius of a radial inner manifold edge 18 of the manifold 3 increases steadily in the course from the first manifold edge 15 towards the second manifold edge 15. In other words, starting from the first bend edge 15 towards the second bend edge 15, the radial inner bend edge 18 flattens less and less as the course increases, that is, the curvature decreases as the course increases. However, since the curvature is greatest at the beginning of the course is, the result is a lower height of the elbow 3 relative to the axis 4 compared to a course with the same curvature.

The curved manifold 3 described, including the manifold housing 2 which accommodates the manifold 3 and has a rectangular shape in plan view, are made of gray cast iron. In this respect, the manifold 3 is manufactured by means of a mold (not shown) for casting the manifold 3 in such a way that when the manifold 3 produced is connected to the riser pipe 3 at the first manifold end 14 facing the impeller 6, the manifold 3 is different in terms of its shape radial center line 17 extends steadily away from the axis 4, at the opposite second elbow end 15 the outlet 16 for the conveyed fluid is provided, and the radial diameter as the height of the elbow 3 initially decreases from the first elbow end 14 towards the second elbow end 15 and then enlarged as previously described.

The exemplary embodiments described are merely examples that can be modified and/or supplemented in a variety of ways within the scope of the claims. Each feature described for a particular embodiment may be used alone or in combination with other features in any other embodiment. Any feature described for an embodiment of a particular category can also be used in a corresponding manner in an embodiment of another category.

Reference symbol list

Vertical turbine pump 1 manifold housing 2 manifold 3 axis 4 Riser pipe 5 Motor shaft 6 Lower riser end 7 Wheel 8th Upper riser end 9 base plate 10 Drive lantern 11 engine 12 coupling 13 First bend end 14 Second manifold end 15 outlet 16 Centerline 17 Radial inner edge of the bend 18

Claims (14)

Vertical turbine pump (1) with a riser pipe (5) extending along an axis (4), a motor shaft (6) arranged in the riser pipe (5), a motor (12) arranged at an upper end of the riser pipe (9) and driving the motor shaft (6), an impeller (8) arranged on an opposite, lower riser pipe end (7) and driven by the motor shaft (6) for conveying a fluid into the riser pipe (5), and a pressure-side manifold (3) connected to the riser pipe (5) at a first manifold end (14) facing the impeller (8), having a curvature continuously away from the axis (4) and an outlet (16) at an opposite second manifold end ( 15) for the conveyed fluid, where a radial diameter as the height of the manifold (3) is initially reduced from the first manifold end (14) to the second manifold end (15) and then increased. Vertical turbine pump (1) according to the preceding claim, wherein the radial diameter initially decreases steadily and then increases steadily. Vertical turbine pump (1) according to one of the preceding claims, wherein the radial diameter between the first manifold end 14) and the second manifold end (15) is compared to the radial diameter at the first manifold end (14) and/or at the second manifold end (15). reduced by ≥ 10%, 20%, 30%, 40%, 50% or 60%. Vertical turbine pump (1) according to one of the preceding claims, wherein an axial diameter as the width of the manifold (3) initially increases and then decreases from the first manifold end (14) towards the second manifold end (15). Vertical turbine pump (1) according to the preceding claim, wherein the axial diameter initially increases steadily and then steadily decreases. Vertical turbine pump (1) according to one of the two preceding claims, wherein the axial diameter between the first manifold end (14) and the second manifold end (15) is compared to the radial diameter at the first manifold end (14) and / or at the second manifold end ( 15) increased by ≥ 10%, 20%, 30%, 40%, 50%, 60%, 70% or 80%. Vertical turbine pump (1) according to one of the preceding claims, wherein the manifold (3) is designed in the manner of a cobra head. Vertical turbine pump (1) according to one of the preceding claims, wherein a cross section of the manifold (3) is always the same size in the course between the first manifold end (14) and the second manifold end (15). Vertical turbine pump (1) according to one of the preceding claims, with a drive lantern (11) provided between the motor (12) and the manifold (3) with a coupling (13) provided between the motor (12) and the motor shaft (6), the Drive lantern (11) and the manifold (3), including a manifold housing (2) preferably having the manifold (3), are made in two parts. Vertical turbine pump (1) according to one of the preceding claims, wherein the manifold (3) between the first manifold end (14), which has a particularly circular cross section, and the second manifold end (15), which has a particularly circular cross section, has a particularly constantly changing elliptical cross section having. Vertical turbine pump (1) according to one of the preceding claims, wherein the first manifold end (14) and the second manifold end (15) have the same size, in particular a circular cross section. Vertical turbine pump (1) according to one of the preceding claims, wherein a radius of a radial inner bend edge (18) increases in particular continuously from the first bend end (14) towards the second bend end (15). Vertical turbine pump (1) according to one of the preceding claims, wherein the manifold (3) is made of gray cast iron. Using a tubular manifold (3) for a vertical turbine pump (1). a riser pipe (5) extending along an axis (4), a motor shaft (6) arranged in the riser pipe (5), a motor (12) arranged at an upper end of the riser pipe (9) and driving the motor shaft (6), and an impeller (8) arranged on an opposite, lower riser pipe end (7) and driven by the motor shaft (6) for conveying a fluid into the riser pipe (5), wherein the manifold (3) is connected to the riser pipe (5) at a first manifold end (14) facing the impeller (8), a curvature continuously away from the axis (4) and an outlet (16) at an opposite second manifold end (15). ) for the pumped fluid, and a radial diameter as the height of the manifold (3) is initially reduced from the first manifold end (14) to the second manifold end (15) and then increased.

Images