Vertical turbo pump and method for producing elbow housing and / or lantern housing of vertical turbo pump

Abstract

The invention relates to a vertical turbine pump (1) having: a riser (5) extending along a shaft (4); a motor shaft (6) arranged in the riser (5); an elbow housing (2) which has an elbow (3) arranged therein and which is connected to the riser (5) on the pressure side; a lantern housing (11) which is arranged on the elbow housing (2) and accommodates the motor shaft (6); and a motor (12) which is arranged on the lantern housing (11) and drives the motor shaft (6), the elbow housing (2) and / or the lantern housing (11) being formed without a mold and having a rectangular cross-section.

Description

Technical Field

[0001] The present invention relates to a vertical turbine pump having: a riser extending along an axis; a motor shaft arranged in the riser; an elbow housing having an elbow arranged therein and connected to the riser on the pressure side; a lantern housing arranged on the elbow housing and accommodating the motor shaft; and a motor arranged on the lantern housing and driving the motor shaft. The present invention also relates to a method for manufacturing an elbow housing and / or a lantern housing for accommodating a motor shaft of a vertical turbine pump that can be driven by a motor, wherein the riser extends along the axis and the motor shaft is arranged in the riser. Background Art

[0002] A vertical turbine pump (also called vertical turbine in English) is a half-shaft pump designed to pump liquids, especially from an open reservoir, to a higher level. Vertical turbine pumps are used for all types of applications, from process water pumping in industrial plants to cooling tower water supply in power stations, from raw water pumping for irrigation to water pressure increase in municipal pumping systems, and almost any other conceivable pumping application. By connecting several impellers in series, vertical turbine pumps can achieve delivery heights of, for example, 40 to 100 meters.

[0003] A vertical turbine pump typically includes a motor mounted on some kind of base or motor mount. The motor shaft may be directly attached to or coupled to the motor and extends downwardly through a column holder or vertical tube assembly (also known as a riser) toward the impeller. The impeller contains a plurality of impeller blades that rotate with the motor and motor shaft, thereby delivering fluid into the riser.

[0004] EP 2606238A1 describes a vertical turbine pump, which extends in a longitudinal direction and has a motor and a motor shaft, which is rotatably connected to the motor and drives an impeller. The fluid conveyed vertically upward to the riser by the impeller flows out of the riser from above the bottom plate through a tubular elbow in a horizontal direction.

[0005] In the embodiments known from the prior art, the elbow is arranged in a cast iron elbow housing, called "delivery elbow", which is arranged on a base plate in the axial extension of the riser. A cast iron lantern housing, also called motor support or in combination with the delivery elbow as DBMS housing, is arranged on the elbow housing in the axial extension of the riser, in which the motor shaft is arranged. Finally, the motor, which is usually heavy, is arranged axially on the lantern housing.

[0006] In this respect, in the case of axially elongated DBMS housings known from the prior art, there is a considerable risk that the speed of the motor reaches the natural frequency of the above-mentioned components and thus causes resonances, which can lead to vibrations and damage to the vertical turbine pump. Summary of the invention

[0007] Based on this situation, the object of the present invention is to specify a vertical turbine pump and a corresponding production method for a vertical turbine pump which avoids resonance situations.

[0008] The object of the invention is achieved by the features of a vertical turbine pump and a corresponding production method for a vertical turbine pump. Advantageous embodiments are given in the detailed description.

[0009] Accordingly, the object is achieved by a vertical turbine pump having: A riser extending along the axis, a motor shaft arranged in the riser tube, and in particular a motor shaft protection tube for the motor shaft, an elbow housing having an elbow arranged therein and connected to the riser on the pressure side, a lantern housing disposed on the elbow housing and accommodating the motor shaft, and A motor is arranged on the lantern housing and drives a motor shaft, wherein The elbow housing and / or the lantern housing are formed without a die and have a rectangular cross section.

[0010] In the case of elbow and / or lantern housings known from the prior art, there is a significant risk that the natural frequency of the structure formed by the elbow and / or lantern housing and the mass of the engine may be influenced during operation of the turbopump, leading to undesired resonance situations that negatively affect the operation of the vertical turbopump. This risk stems fundamentally from the fact that the elbow and / or lantern housings known from the prior art do not have a rectangular structure but a circular structure, which generally has a lower natural frequency than a rectangular structure.

[0011] In other words, the elbow housings and / or lantern housings known in the prior art have a regular conical or circular shape, a cast and / or welded structure with a minimum wall thickness due to the casting process and the casting material used, allowing only a very limited control over the material properties, with little or no possibility of influencing the rigidity of the structure in order to shift the natural frequency into a range that is not critical for the operation of the vertical turbine pump.

[0012] The proposed solution takes a fundamentally different approach from the solutions known from the prior art, in which the elbow housing and / or lantern housing are on the one hand formed without a die, i.e. made of rolled steel for example, and on the other hand have a rectangular cross section, i.e. have a rectangular, square and / or box-shaped form for example. The structure formed in this way is stiffer than a cast conical or circular shape due to the higher modulus of elasticity, allows greater design freedom, is more cost-effective, since the rectangular, square and / or box-shaped form can be realized using standard or common steel profiles, and also allows a more compact design, since the base of the elbow housing and / or lantern housing is smaller and the elbow housing and / or lantern housing can therefore be installed in more restricted installation positions.

[0013] In summary, the proposed solution enables cost savings through weight reduction and the use of standard components, without the need for expensive casting tools, and increases the stiffness of the elbow housing and / or lantern housing, since the mechanical properties of rolled steel are significantly better than those of grey cast iron, for example. By optimizing the stiffness of the elbow housing and / or lantern housing in this way, the natural frequency of the vertical turbine pump is significantly changed due to the use of the thrust field, which significantly reduces vibrations during operation, so that potential destruction of the vertical turbine pump can be excluded in principle.

[0014] Forming without a die means in particular that the elbow shell and / or the lantern shell is not formed in one piece, i.e. in particular not produced by means of a casting process, i.e. the initial mold of the elbow shell and / or the lantern shell is not produced directly from a liquid state, for example by means of a casting mold. In particular, forming without a die also means that the elbow shell and / or the lantern shell is not produced according to a production process based on DIN8580, i.e. not according to a production process in which a solid body with a geometrically defined shape is produced from an unformed material. In other words, the expression "dieless" means in particular that the direct starting material for forming the elbow shell and / or the lantern shell is not present in a liquid, gas, plastic, granular or powder state. Preferably, the elbow shell and / or the lantern shell has a rectangular, square and / or aforementioned box-shaped shape, which defines a rectangular cross-section relative to the axis of the riser. Unless otherwise defined, the terms axial and radial preferably refer to the axis of the riser. The cross section preferably extends in a radial direction and / or the normal of the cross section extends parallel to the axis.

[0015] In particular, the elbow housing and / or lantern housing provides a load-bearing function for the hydraulic device and / or the motor of the turbopump, for guiding the motor shaft, for facilitating maintenance, etc. The harder and more robust the elbow housing and / or lantern housing is, the better it is able to damp any vibrations that occur during the operation of the turbopump. Compared to a circular or cylindrical structure, the proposed rectangular structure is stiffer and therefore less prone to vibrations. The occurrence of resonances means in particular a shift of the first and second natural modes, which can coincide with the operating frequency of the turbopump.

[0016] A vertical turbine pump is a semi-axial flow pump which is configured to pump a liquid, in particular from an open reservoir, to a higher level. Vertical turbine pumps are usually multi-stage, i.e. equipped with more than one impeller. However, they can also be single-stage, i.e. equipped with only one impeller. Each additional impeller increases the delivery head that the pump can generate at a constant flow rate. The outer diameter of the riser can be as small as a few centimeters, so that the axial length of the vertical turbine pump along the shaft is usually much larger than the radial width. The riser regularly extends mainly below the base plate, to which the vertical turbine pump can be attached. In this regard, the motor and the elbow are preferably arranged above the base plate, so that the riser is just above or at the base plate, in particular connected to the first end of the elbow in a fluid-tight manner, and the motor is arranged vertically above the elbow. The riser is preferably made of metal and / or has a circular or quasi-circular cross-section.

[0017] The motor shaft preferably extends in the axial direction along the center line of the riser and passes through the tubular elbow on the outside in the axial extension of the riser. On this outside, an opening can be provided in the elbow, through which the motor shaft passes. Preferably, a seal is provided, in particular a radial seal, which is arranged in the opening and seals the motor shaft in a radially circumferential manner fluid-tightly with respect to the elbow. Preferably, the motor shaft ends in a lantern housing, in which a coupling can be arranged, which coupling can be connected between the motor and the motor shaft.

[0018] The elbow is preferably configured as an elbow or in a manner similar to an elbow and / or has a circular or elliptical shape when viewed from the side. The elbow preferably extends on an arc of a circle or in an arc-like manner over 90°, but other values, such as 80° or 100°, may also be adopted. Preferably, the elbow has a continuous curvature away from the axis, which in particular does not mean that the elbow initially extends in a direction opposite to the second end of the elbow facing away from the riser, for example with an S-shaped form, but extends linearly and / or continuously, in particular in an arc-like or elliptical manner in a side view, continuously further away from the axis or the riser relative to its radial centerline. Furthermore, the feature that the elbow has a curvature continuously away from the axis is to be understood in particular as being synonymous with the feature that the elbow extends continuously away from the axis relative to its radial, in particular arc-like centerline. In the case of an elliptical shape that extends in particular over 90°, the minor axis of the ellipse preferably extends parallel to the axis and / or the major axis extends horizontally.

[0019] Preferably, the radial diameter relative to the axis of the elbow initially decreases with the height of the elbow from the first elbow end to the second elbow end and then increases, which means in particular that at at least one position between the first elbow end and the second elbow end, the height of the elbow is less than the height at the first elbow end and / or at the second elbow end. The elbow has a particularly "flat" shape when viewed from the side. In particular, when viewed from the side, the outside of the elbow may again have a "concave" shape, wherein the height at the "concave" is particularly reduced to a maximum. The radial diameter is particularly understood to be the radial inner diameter of the elbow relative to the axis of the elbow, which defines the clear height in the elbow through which a fluid can flow. In this regard, when speaking of a reduction or increase in diameter, in addition to the inner diameter, the outer diameter may also be referred to.

[0020] According to a preferred further development, the elbow housing and / or the lantern housing are formed without a die, in particular from rolled steel, sheet metal and / or welded. For example, the elbow housing and / or the lantern housing can have four axially extending flat side walls, for example steel sheets, each of which is welded with its opposite axial edges to upper and lower radially extending, in particular rectangular fastening plates with openings. The elbow housing and / or the lantern housing are in particular made of metal, for example iron or aluminum. Welding allows particularly thin walls to be achieved, about two to three times thinner than cast structures. The elbow housing and the lantern housing can be formed integrally as a single or common housing, i.e. not divided into two housings.

[0021] According to another preferred embodiment, the elbow housing and / or lantern housing has an axially extending rolled corner and / or angle profile at its corners, in particular an L-profile, in particular a triangular profile in cross section, in particular as an L-profile closed with diagonal pieces. Different types of angle profiles can also be selected depending on the desired stiffness behavior of the angle profile. Axially and / or longitudinally extending corner and / or angle profiles can be used to transmit longitudinal forces that counteract bending moments. The angle profile is preferably configured as a straight, axially extending, extruded and / or thin-walled profile, such as a tubular or channel profile, which can be welded to a flat steel plate as a side wall without complex edge processing for ease of manufacturing. If, for example, an additional reinforcement profile is required during operation of the vertical turbine pump to further increase the stiffness, this additional reinforcement profile can be simply welded to the moldless elbow housing and / or lantern housing in comparison to the elbow housing and / or lantern housing with a conical or cylindrical shape and cast side walls known from the prior art. The angle profile is preferably directed outwards, ie the legs of the angle profile extend radially away from the axis, to increase the shear and bending stiffness. An L-profile closed with diagonal pieces provides high stiffness and is easy to produce.

[0022] According to a further preferred development, the elbow housing and / or the lantern housing has at least two opposite, axially extending flat side walls. Such flat, in particular spaced-apart, rectangular and / or mutually parallel side walls allow shear resistance to be utilized in order to effectively damp unwanted vibrations. The side walls can be arranged between two angle profiles arranged at the corners and in particular welded to these angle profiles and / or can extend over the entire axial extent of the angle profiles and / or between the fastening plates. In this way, the rigidity can be further increased due to the side walls acting as so-called shear profiles. In particular, a box-shaped elbow housing and / or lantern housing, preferably without curvature, allows a high degree of rigidity.

[0023] According to a further preferred embodiment, axially and radially extending flat reinforcing elements extend away from the side wall. The reinforcing elements can be profiled, rectangular and / or flat, in particular extend vertically away from the side wall and / or are welded to the side wall and allow the natural frequency to be favorably influenced. Preferably, the reinforcing elements extend along the entire axial extent of the side wall, the angle profile, the elbow housing and / or the lantern housing and / or are connected to the fastening plate, in particular welded to the fastening plate.

[0024] According to another preferred development, an opening is provided in the side wall. The opening can be configured as a recess in the side wall, so that the side wall, for example, only extends over a portion of the axial extent of the lantern housing and / or the lantern housing. The opening can be closed with a ventilation grille or the like and / or can be used for maintenance of the lantern housing and / or the lantern housing.

[0025] According to another preferred embodiment, the elbow housing and the lantern housing and / or the lantern housing and the motor, in particular the motor housing of the motor, are screwed together, in particular at regular intervals and / or at corners. According to another preferred development, the elbow housing and / or the lantern housing has a radially extending fastening plate at at least one axial end, in particular at both axial ends, in particular in the form of a rectangular flange, in particular with a rectangular cross section.

[0026] Preferably, the elbow housing and the lantern housing and / or the lantern housing and the motor, in particular the motor housing of the motor, are connected to one another with screws which pass through corresponding fastening plates. Preferably a rectangular and / or formless base element is provided, which base element also preferably has corresponding radially extending fastening plates at both axial ends, in particular fastening plates with a rectangular cross section. The base element is preferably arranged between the elbow housing and a base plate, preferably a base, wherein the base element is further preferably screwed to the elbow housing and / or the base plate via corresponding fastening plates. The fastening plates preferably have an opening, in particular a rectangular or circular opening, through which, for example, the motor shaft is guided.

[0027] According to another preferred embodiment, the elbow housing, the lantern housing and / or the motor are arranged in the axial extension of the riser and / or the lantern housing is arranged in the axial extension of the riser between the elbow housing and the motor. In other words, the motor is preferably arranged above the lantern housing and the lantern housing is preferably arranged above the elbow housing. According to another preferred development, the elbow housing and / or the lantern housing are box-shaped, in particular rectangular.

[0028] According to another preferred embodiment, the vertical turbine pump has an impeller, which is arranged at the lower end of the opposite riser and driven by the motor shaft for conveying the fluid into the riser. The riser and / or the vertical turbine pump preferably have an axial length of ≥10, 20, 30, 40 m or more. A plurality of impellers arranged axially one behind the other can be provided at the first end of the lower part of the riser, through which the fluid is conveyed into the riser and axially upwards to the elbow. The second riser end is preferably connected to the first elbow end in a fluid-tight manner, in particular they are screwed together.

[0029] The problem is further solved by a method for producing an elbow housing for an elbow which can be arranged therein and which can be connected on the pressure side to a riser, and / or for producing a lantern housing for accommodating a motor shaft of a vertical turbine pump which can be driven by a motor, wherein the riser extends along the shaft and the motor shaft is arranged in the riser, the method comprising the following steps: Dieless forming, in particular for producing elbow housings and / or lantern housings with a rectangular cross section.

[0030] According to a preferred embodiment, dieless forming comprises production from rolled steel, from sheet metal and / or production by means of welding.

[0031] According to another preferred development, the dieless forming comprises welding an axially extending angle profile, in particular an L-profile, in particular a profile with a triangular cross-section, arranged at a corner of the elbow shell and / or the lantern shell to a radially extending fastening plate, in particular a fastening plate with a rectangular cross-section, arranged at at least one axial end, in particular at both axial ends, of the elbow shell and / or the lantern shell.

[0032] According to another preferred embodiment, the dieless forming comprises providing at least two opposing, axially extending planar side walls.

[0033] According to a further preferred development, the dieless forming comprises forming the elbow housing and / or the lantern housing in a box shape.

[0034] Similar to the vertical turbine pump described above, other advantages and embodiments of this method will become apparent to those skilled in the art. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The invention will be explained in more detail below on the basis of preferred exemplary embodiments with reference to the accompanying drawings.

[0036] In the attached picture:

[0037] Figure 1 shows a schematic cross-sectional view of a vertical turbine pump having an elbow housing and a lantern housing according to a preferred exemplary embodiment of the present invention,

[0038] Figure 2 A preferred exemplary embodiment of the present invention is shown. Figure 1 Schematic perspective view of the elbow housing and lantern housing of a vertical turbine pump,

[0039] Figure 3 Another preferred exemplary embodiment of the present invention is shown. Figure 1 Schematic transparent plan view of the lantern housing of a vertical turbine pump,

[0040] Figure 4 According to another preferred exemplary embodiment of the present invention, Figure 1 Schematic perspective view of the lantern housing of a vertical turbine pump,

[0041] Figure 5 According to another preferred exemplary embodiment of the present invention, Figure 1 A schematic perspective view of the lantern housing of a vertical turbine pump, and

[0042] Figure 6 According to another preferred exemplary embodiment of the present invention, Figure 1 Schematic perspective view of the lantern housing of a vertical turbine pump. DETAILED DESCRIPTION

[0043] Figure 1 A schematic cross-sectional view of a vertical turbine pump 1 according to a preferred exemplary embodiment of the invention is shown, which has an abstractly drawn elbow housing 2 with an elbow 3 and an abstractly drawn lantern housing 11 .

[0044] The vertical turbine pump 1 has a riser 5 extending along an axis 4, the outer cross section of which is circular and has a plurality of interconnected segments. A motor shaft 6 extends in the center of the metal riser 5 along the axis 4 and along the entire length of the riser 5, so that a free space is formed radially around the motor shaft 6 between the motor shaft 6 and the riser 5, through which the fluid conveyed by the vertical turbine pump 1 rises axially upwards. For this purpose, a plurality of impellers 8 arranged axially one above the other are provided at the lower end 7 of the riser, which are driven by the motor shaft 6, suck in the fluid and convey it into the free space.

[0045] The upper end 9 of the lifting pipe is attached to the base plate 10 so that the lifting pipe 5 extends vertically downward away from the base plate 10. Above the base plate 10, the elbow housing 2 is adjacent vertically or upward in the direction of the axis 4, initially in contact with the base plate, then adjacent to the lantern housing 11 in axial contact in sequence, and finally adjacent to the motor 12 that drives the motor shaft 6 and is arranged in the motor housing. The coupling 13 is arranged in the lantern housing 11 and connected between the motor 12 and the motor shaft 6. Therefore, the end of the motor shaft 6 is in the lantern housing 11. The elbow housing 2 and the lantern housing 11 are constructed as two parts and are screwed together as described below. The upper end 9 of the lifting pipe is fluid-tightly connected to the first elbow end of the elbow 3 facing the impeller 8.

[0046] Reference now Figure 2 and Figure 3 , Figure 2 The preferred exemplary embodiment of the present invention is shown Figure 1 A schematic perspective view of an elbow housing 2 and a lantern housing 11 of a vertical turbine pump 1, Figure 3 Shows relative to Figure 2 Slightly supplemented according to another preferred exemplary embodiment of the present invention Figure 1 A schematic cross-sectional view of a plan view of a lantern housing 11 of a vertical turbine pump 1, wherein both the elbow housing 2 and the lantern housing 11 are produced without a die, i.e., are made of metal sheets welded together of rolled steel and profiles, and both the elbow housing 2 and the lantern housing 11 have a rectangular cross-section in a plan view.

[0047] Specifically, the elbow housing 2 and the lantern housing 11 each have axially extending, spaced-apart corners of angle profiles 14 at their four corners, which are configured as outwardly open L-shaped profiles and each is closed, i.e., triangular in cross section, as can be seen in particular from Figure 3 Seen in ( Figure 1 The L-shaped profile is not shown.) Axially extending flat side walls 15 made of sheet metal are arranged between two adjacent angle profiles 14 and are welded to the angle profiles 14 .

[0048] The four side walls 15 extend at least on the lantern housing 11 only along a portion of the axial extent of the angle profile 14, wherein an opening 16 for maintaining the lantern housing 11 is provided in another portion, and the opening 16 is covered by a removable grille. The elbow housing 2 also has four side walls 15, one of which is closed because the elbow passes through this side wall 15 shown on the left front in the figure. Figure 3 In the embodiment shown, the two side walls 15 shown at the top and bottom in the figure are provided with flat, axially and radially extending rectangular reinforcing elements 17 made of sheet metal which are welded to the respective side walls 15 along their axial edges.

[0049] return Figure 2 The elbow housing 2 has a radially extending fastening plate 18, each of whose two axial ends has a rectangular cross section, such as Figure 3 The fastening plate for the lantern housing 11 shown is provided with a circular opening surrounded by the side wall 15 for the passage of the riser pipe 5. At its axial lower end, the lantern housing 11 also has such a fastening plate 18, which is constructed or arranged to coincide with and contact the fastening plate 18 of the upper part of the elbow housing 2. At its axial upper end, the lantern housing 11 has an octagonal fastening plate 18, which is in contact with the circular base of the engine housing. In this regard, the corresponding fastening plate 18 extends perpendicularly to the side wall 15 and is welded to the side wall 15 and the angle profile 14.

[0050] A base member 19 is provided axially below the elbow housing 2. The base member 19 is also formed without a mold and is box-shaped, and also has a fastening plate 18 at its axial lower end. At its axial upper end, the base member 19 is formed and arranged to be consistent with and in contact with the fastening plate 18 of the lower portion of the elbow housing 2. Figure 3 Like the lantern housing 11, the base element 19 is also provided with axially and radially extending rectangular reinforcement elements 17 made of sheet metal.

[0051] The base element 19 is fastened to a base (not shown) by means of its fastening plates 18. The elbow housing 2 placed axially on the base element 19 is fastened to the base element 19 by means of screws guided through the fastening plates 18 in the lower part of the elbow housing 2, wherein the screws are arranged at regular intervals on the one hand and at the corners of the fastening plates 18 on the other hand. The lantern housing 11 placed axially on the elbow housing 2 is also fastened by means of screws guided through the corresponding fastening plates 18, wherein the screws are again arranged at regular intervals on the one hand and at the corners of the fastening plates 18 on the other hand. Finally, the motor housing of the motor 12 mounted axially on the lantern housing 11 is also connected by means of screws guided through the octagonal fastening plates 18 of the lantern housing 11 and the circular base of the motor housing.

[0052] Figures 4 to 6 According to another preferred embodiment of the present invention, Figure 1 and a schematic perspective view of the lantern housing 11 of the vertical turbine pump 1 with corresponding reinforcement elements 17. Figure 4 In the exemplary embodiment of , two crossed sheet metal strips are welded to the side wall 15 as reinforcement elements 17. Of the two struts of the reinforcement element 17, one strut extends diagonally between two oppositely arranged fastening plates 18 and oppositely arranged angle profiles 14, while the other strut is welded diagonally to the first strut and in two parts at the respective ends to the center of the continuous strut.

[0053] Figure 5A similar design is shown, but with four struts as reinforcing elements 17, which are configured as crossed U-profiles. In each case, two struts extend parallel to the remaining two struts, which also extend parallel to each other. The rectangular struts are each welded along their longitudinal edges to the side walls 15, and the transverse edges to the angle profiles 14. Finally, Figure 6 An axially extending reinforcing element 17 is shown, which has an axial cross section in the form of a U, the edges of which are welded to the side wall 15 and to the opposing fastening plate 18 .

[0054] The exemplary embodiments described are merely examples that can be modified and / or supplemented in various ways within the scope of the claims. Each feature described for a specific exemplary embodiment can be used independently or in combination with other features in any other exemplary embodiment. Each feature described for an exemplary embodiment of a certain category can also be used in a corresponding manner in an exemplary embodiment of another category.

[0055] Reference numerals list Vertical turbine pump 1, Elbow shell 2, Elbow 3, Axis 4, Riser 5, Motor axis 6, The lower end of the lifting pipe 7, Impeller 8, The upper end of the riser 9, Bottom plate 10, Lantern housing 11, Motor 12, Coupling 13, Angle profile 14, Side wall 15, Opening 16, Reinforcing element 17, Fastening plate 18, Base element 19.

Claims

1. A vertical turbine pump (1), comprising: a riser (5) extending along the axis (4), a motor shaft (6), the motor shaft being arranged in the riser tube (5), an elbow housing (2) having an elbow (3) arranged therein and connected to the riser (5) on the pressure side, a lantern housing (11), which is arranged on the elbow housing (2) and accommodates the motor shaft (6), and a motor (12), which is arranged on the lantern housing (11) and drives the motor shaft (12), wherein The elbow housing (2) and / or the lantern housing (11) are formed without a die and have a rectangular cross section.

2. The vertical turbine pump (1) according to claim 1, wherein the elbow housing (2) and / or the lantern housing (11) consists of rolled steel, is formed without die from sheet metal and / or is welded.

3. The vertical turbine pump (1) according to claim 1, wherein the elbow housing (2) and / or the lantern housing (11) has an axially extending angle profile (14) at its corners.

4. The vertical turbine pump (1) according to claim 1, wherein the elbow housing (2) and / or the lantern housing (11) has at least two opposite, axially extending flat side walls (15).

5. A vertical turbine pump (1) according to claim 4, wherein axially and radially extending flat reinforcing elements (17) extend away from the side wall (15).

6. The vertical turbine pump (1) according to claim 4 or 5, wherein an opening (16) is provided in the side wall (15).

7. The vertical turbine pump (1) according to any one of claims 1 to 4, wherein the elbow housing (2) and the lantern housing (11) and / or the lantern housing (11) and the motor (12) are screwed together.

8. The vertical turbine pump (1) according to any one of claims 1 to 4, wherein the elbow housing (2) and / or the lantern housing (11) has a radially extending fastening plate (18) at at least one axial end.

9. A vertical turbine pump (1) according to any one of claims 1 to 4, wherein the elbow housing (2), the lantern housing (11) and / or the motor (12) are arranged in the axial extension of the riser (5), and / or the lantern housing (11) is arranged in the axial extension of the riser (5) between the elbow housing (2) and the motor (12).

10. The vertical turbine pump (1) according to any one of claims 1 to 4, wherein the elbow housing (2) and / or the lantern housing (11) is box-shaped.

11. A vertical turbine pump (1) according to any one of claims 1 to 4, comprising an impeller (8) arranged at the lower end (7) of the opposite riser and driven by the motor shaft (6) for conveying fluid into the riser (5).

12. A method for producing an elbow housing (2) and / or a lantern housing (11) for an elbow (3) arranged therein and connected to a riser (5) on the pressure side, the lantern housing (11) for accommodating a motor shaft (6) of a vertical turbine pump (1) drivable by a motor (12), wherein the riser (5) extends along a shaft (4) and the motor shaft (6) is arranged in the riser (5), the method comprising the following steps: The elbow shell (2) and / or the lantern shell (11) are formed without a die to have a rectangular cross section.

13. The method according to claim 12, wherein the dieless forming comprises production from rolled steel, from sheet metal and / or production by means of welding.

14. The method according to claim 12, wherein the dieless forming includes welding an axially extending angle profile (14) arranged at a corner of the elbow shell (2) and / or the lantern shell (11) to a radially extending fastening plate (18) arranged at at least one axial end of the elbow shell (2) and / or the lantern shell (11).

15. A method according to any one of claims 12 to 14, wherein the dieless forming comprises providing at least two opposing, axially extending planar side walls (15).

16. The method according to any one of claims 12 to 14, wherein dieless forming comprises forming the elbow housing (2) and / or the lantern housing (11) in a box shape.

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