LU101956B1 - centrifugal pump - Google Patents

Abstract

The invention relates to a centrifugal pump with a motor housing (1) with a drive motor (3) arranged in the motor housing (1) and a pump housing (2) arranged on the motor housing (1) and forming a pump chamber (4) with a pump chamber ( 4) arranged and driven by the drive motor (3) impeller (5) for conveying a fluid, wherein the motor housing (1) is coaxially surrounded on the outside by a cooling jacket (7) forming a cooling jacket space (6), which cooling jacket space (6) has a the pump chamber (4) has a cooling jacket inlet (8) which opens into the cooling jacket room (6), through which the fluid conveyed by the impeller (5) can flow into the cooling jacket room (6), and the cooling jacket room (6) has an inside of the pump housing (2 ) and has a cooling jacket outlet (10) opening outside of the pump chamber (4), through which the fluid can flow out of the cooling jacket chamber (6).

Description

centrifugal pump .

Technical Field | The invention relates to a centrifugal pump with a motor housing with a Mo | gate housing arranged drive motor and arranged on the motor housing | a pump chamber forming a pump housing with an attached in the pump chamber | ordered and driven by the drive motor impeller for pumping a fluid, where | in the motor housing coaxially outside of a cooling jacket space forming | Cooling jacket is surrounded, which cooling jacket space from the pump room in the | Cooling jacket chamber opening cooling jacket inlet, through which from the impeller | required fluid can flow into the cooling jacket space. The invention also relates | use of the centrifugal pump as a waste water and/or sewage submersible pump | or in a lifting station. | Background of the Invention | Watertight encapsulated submersible motors are found in particular in dirty water and/or | Sewage submersible pumps or use in lifting stations. Compared to standard motors | Such watertight encapsulated submersible motors have no simple active cooling with | by means of an air flow. The power loss of the submersible motor is usually compensated by suitable .

active cooling is dissipated via the medium surrounding it. Fine listing of the dive mo- .

torrs in air causes low operating times or power yields or a | relatively high use of active materials such as copper or iron. To take this aspect | To generate the most economical solutions, oil-filled engines, oil-filled engine | engines with internal cooling or dry engines with external, closed circulation cooling | tion or open jacket flow cooling. | With jacket flow cooling, the total volume flow or only a partial volume flow |! current was introduced into the cooling jacket to cool the motor, but this caused problems |

LU101956 | and in particular can lead to a reduction in operational reliability. Because through the ; Solids conveyed in the cooling jacket space can sediment over time in the cooling | jacket space, especially in the case of sewage pumps. | Description of the Invention | Based on this situation, it is an object of the present invention to provide a circular | specify a self-pump that is characterized by improved operational reliability. | | The object of the invention is solved by the features of the independent claim. | Advantageous configurations are specified in the subclaims. | Accordingly, the task is solved by a centrifugal pump with a motor housing with | a arranged in the motor housing drive motor and on the Motorgehäu- | se arranged a pump chamber forming a pump housing with a pump in the | impeller arranged in a pen space and drivable by the drive motor for conveying | of a fluid, where | the motor housing coaxially outside of a forming a cooling jacket space.

Cooling jacket is surrounded, which cooling jacket space from the pump room in the | Ktühlmantelraum has cooling jacket inlet mouthing, through which of the impeller. pumped fluid can flow into the cooling jacket space, and | the cooling jacket space inside the pump housing and outside the pump | penraums opening cooling jacket outlet through which the fluid from the |! Kithlmantelraum is outflowable. | An essential point of the invention is accordingly that the fluid, after flowing through the Cooling jacket space after cooling the drive motor into the pump space, for example | do not point in a space behind the impeller and/or an edge side space of the impeller | rads as known from the prior art, but outside of the pump chamber from | flows. A cooling jacket backflow therefore takes place back in front of a suction mouth of the circuit pump, for example, in a suction strainer of the centrifugal pump in front of the pump room. |

LU101956 | The proposed recirculation of the fluid as a cooling volume flow from the pump | Penraum addition, an entry of solids in the marginal side space is effectively mini- | and thus significantly increases the operational reliability of the centrifugal pump, since such a | Blocking of the impeller is reduced. At the same time, a sedimentation of the cooling | jacket space is reduced or even completely avoided over time, since the | Cooling jacket space funded solids through the cooling jacket outlet especially in the | Suction mouth of the centrifugal pump are required. |! Especially with sewage pumps, safe operation with a cooling jacket space cooling | only guaranteed if an air-water mixture is always fed back into the pump room | will. If the return of the fluid as a cooling medium is designed in such a way that | that after the drive motor is switched on, only air initially enters the pump chamber | is pressed, a fluid flow may break off. Tearing off ge | happens in particular when the air in the cooling jacket flows through the inflow | ing fluid is compressed and then suddenly escapes into the pump chamber. | In the proposed solution, this problem is eliminated in that the fluid.

does not escape from the cooling jacket into the pump chamber but outside of it. With | In other words, a return flow of the fluid is designed in such a way that the impeller is always running with genii; ing fluid is applied and a sudden entry of air is avoided. | | A centrifugal pump is generally referred to as a flow machine that has a | Rotational movement and dynamic forces for pumping mainly liquids as | Fluid uses. In addition to a tangential acceleration of the fluid, also called medium, | is used in radial flow occurring centrifugal force for promotion, so that centrifugal.

pumps can also be referred to as centrifugal pumps. In the regular operation of the circuit | selpumpe the motor housing is preferably arranged above the pump housing, with | this permanently connected and / or designed in one piece. The fluid preferably comprises water.

ser or any other liquid medium such as waste water. The fluid can | Solids such as impurities of any kind, especially faeces, se.

— dimente, dirt, sand, or also smaller pieces of wood, undergrowth, textiles or rags | or the like. The impeller is preferably completely in the pump room. arranged. |

LU101956 | The motor housing and/or cooling jacket may comprise a cylinder-like shape which may taper away from the pump housing. The motor housing is preferably | and/or the cooling jacket space made of metal, in particular made of stainless steel, and/or the pump | pen body made of plastic. The cooling jacket space preferably surrounds the motor housing house at least partially and in particular completely, particularly preferably along | a lateral surface of the motor housing. The cooling jacket inlet is preferably in a | Pressure outlet of the pump housing and / or arranged in such a way in the pump housing, | that a rotational movement of the impeller allows fluid to flow into the cooling jacket space | and/or pumps. The cooling jacket space is preferred except for the cooling jacket inlet and the. Cooling jacket outlet fluid-tight closed. : According to a preferred development, the cooling jacket outlet opens into an intake manifold area of the impeller in front of the pump chamber and/or where the cooling jacket outlet opens | upstream of the pump room. The fluid is therefore not returned after | the impeller as in the configurations known from the prior art, but | in any case outside the pump chamber containing the impeller, in particular as | suggested by the training in front of the pump room, which is a risk of Abrei-.

Bens of the fluid flow is eliminated or at least significantly reduced. | According to another preferred development, the cooling jacket inlet is in a | Arranged overpressure area of the pump chamber and / or is the cooling jacket outlet in | arranged in a vacuum area of the pump housing. The overpressure area is | preferably behind the impeller in what is known as the edge side space of the pump space see. The negative pressure area is preferably in an intake area of the pump housing | provided in front of the pump room. Due to a differential pressure between the cooling jacket inlet, outlet, at which overpressure occurs due to the rotational movement of the impeller, and | Cooling jacket outlet, with a lower negative pressure than this, fluid flows through the | Cooling jacket from the cooling jacket inlet to the cooling jacket outlet for cooling the engine | tors. |

LU101956 | According to a further preferred embodiment, the pump housing has an inflow. on the side provided in front of the pump chamber suction strainer, wherein the cooling jacket outlet.

covered by the strainer. The strainer can be designed as a lattice | be designed and be provided below a bottom plate of the pump housing, part | be the base plate and / or the pump housing and / or integral with this design | to be In this way, the suction strainer is located in the suction area and/or underpressure realm of the centrifugal pump. ; According to another preferred development, the centrifugal pump has a Cooling jacket space provided tube, which on the one hand at a first end of the | Cooling jacket space opens into the cooling jacket outlet, parallel to an axis of the | Impeller to a first end opposite to the second end of the | Cooling jacket space extends and on the other hand at the second end in the cooling jacket space | means. Preferably, the tube is at the second end to form a circular.

Flow curved, for example with a radius of 28 mm over 15, 30 or 45 degrees | or more degrees. The tube is preferably made of metal, in particular stainless steel. | The first end preferably forms the kithl jacket outlet. The tube preferably has | a diameter of 8, 10 or 12 mm. In regular operation, the first end is | preferably facing the motor housing at a lower edge of the Kithlmantel and the.

second end preferably ab- the motor housing at an upper edge of the cooling jacket | turns. Cooling jacket outlet and pipe can be designed in one piece. Likewise, the | Cooling jacket outlet can be inserted into the pump housing, for example by milling, in | which the pipe can be inserted. ; Furthermore, a cooling jacket inlet pipe provided in the cooling jacket space | be, which on the one hand at a first end of the Kithlmantelraums in the cooling jacket | lass miindet, parallel to an axis of the impeller up to a to the first | End opposite second end of the cooling jacket space extends and on the other hand | the second end opens into the cooling jacket space. Cooling Jacket Inlet and Cooling Jacket Inlet | outlet pipe can be designed in one piece. Likewise, the cooling jacket inlet in the | Be inserted pump housing, for example by milling, in which the cooling jacket; inlet pipe can be inserted. |

LU101956 |

According to a further preferred embodiment, the tube at the first end in the | Cooling jacket space on a first ventilation opening.

Through the first vent ; solids of greater density and/or weight can be discharged.

Furthermore, | the first ventilation opening improves the operational reliability of the centrifugal pump, since due to the first ventilation opening, air does not escape suddenly into the pump housing;

can.

The first vent opening preferably has a diameter of 3, 4, 5, 6, ;

7 or 8 mm.

More preferably, the tube has two opposite ends at the first end envisaged first vents.

The first vent may be |

Cross bore be designed. | According to another preferred development, the tube is bent at the second end gen, extends parallel to the axis back to the first end and ends on the other hand | at the first end into the cooling jacket space.

The tube is preferred at the second end | bent 180 degrees or approximately 180 degrees.

At the first end is the tube to the | formation of a circular flow, preferably curved, for example with a radius;

from 28 mm over 15, 30, 45 or 60 degrees.

The tube can also be approximately parallel to the axis | lel, for example pivoted by a few degrees, to the first end zurückstrii- | cken. | According to a further preferred embodiment, a second | vent provided.

Solids can pass through the second vent opening. lower density and/or weight are dissipated.

Furthermore, by the second ent. Ventilation opening of the cooling jacket can be vented in a process-reliable manner and it can be prevented that the cooling jacket does not exceed | the cooling jacket outlet is sucked empty.

The second vent opening preferably has | a diameter of 3, 4, 5, 6, 7 or 8 mm.

The second vent may | be designed as a cross hole.

More preferably, the tube has two opposite | provided second vent openings. | According to another preferred development, the centrifugal pump has a second in | the cooling jacket space provided pipe, which at the first end of the cooling man- |

LU101956 : telraumes on the one hand in the cooling jacket outlet and on the other hand in the cooling jacket space / opens. The second tube is preferably designed in one piece with the cooling jacket outlet. To ; For this purpose, two cooling jacket outlets can be provided, which are located next to each other can be arranged adjacent. Likewise, the second tube in the cooling man.

telausass be designed to be pluggable. Particles of greater density can pass through the second tube. discharged in the lower area of the cooling jacket. Furthermore, through the second tube | improves the operational reliability of the centrifugal pump, since due to the second pipe air.

cannot suddenly escape into the pump housing. The second tube is preferred; designed shorter than the first tube. The second tube preferably has a diameter | of 8, 10 or 12 mm. | According to a preferred development, the centrifugal pump is a submersible pump or a heli | installed. A transportable or stationary built-in pump is used as a submersible pump. Centrifugal pump understood, which is immersed in the liquid to be pumped as a fluid. .

Submersible pumps are used in particular in water supply and sewage disposal | tion use. Submersible pumps are used, among other things, to pump coarsely contaminated . Fluids, such as sewage or dirty water in particular, but also for other fluid Medi-.

en with a high solid content such as stones, rubble and the like. | Impeller shapes are found in particular in free-flow impellers, single-channel impellers, multi-channel impellers, diago-| nal wheel, helical wheel and propeller wheel use. Lifting stations are understood to be automatically 0 working systems that return waste water that occurs below a backflow level drain away safely or pump to a higher level. The sewage lifting plant is usually set up at the lowest point in a basement, either freestanding or in a pit, or housed in a shaft, a so-called pump sump. | The object of the invention is further achieved by using a gyro | pump as previously described as a submersible sewage and/or sewage pump or in : a lifting station. In addition, the centrifugal pump can also be used for a drinking water | system or other fluid-conveying applications, where not mentioned here | Plant types can be included. Submersible drainage and/or sewage pumps | are used in particular for pumping dirty water, for example from high | water, in flooded building pits, in laundry rooms, in muddy pits, in biotopes |

LU101956 | and/or garden ponds, seepage shafts and in cellars, in particular for Ë pumping fluids such as water with various degrees of contamination such as | for example stones, mud or rubble. | In particular, the entry of pebbles as solids in the peripheral side space can be the prior art known dirty water pumps to frequent blockage of the; Run impeller and reduce the operational safety significantly. Through the proposed |; Use can be a long-term high efficiency of the dirty water and / or | Make sure to use a submersible sewage pump, as the aforementioned problem is eliminated just like with a ’ lifting station. With a lifting station, the proposed Lô- . solution on vent lines known from the prior art outside of the cooling jacket: renounce and the ventilation of the cooling jacket by the proposed solution | accomplish. | Brief description of the drawings | The invention is described below with reference to the accompanying drawings hand of preferred embodiments explained in more detail. | In the drawings show | 1 shows a schematic partially opened side view of a centrifugal pump as a waste water pump pump according to a preferred embodiment of the invention.

FIG. 2 shows a sectional view of a lower part of the centrifugal pump according to FIG. 1, | Fig. 3 left a schematic partially transparent centrifugal pump as part of a lifting system | and on the right a sectional view of the centrifugal pump as part of a lifting system according to | another preferred embodiment of the invention, and |

LU101956 .

Fig. 4 is a sectional view of a lower part of a centrifugal pump as a sewage pump | according to another preferred embodiment of the invention. | DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS) Fig. 1 shows a schematic partially open side view in the transverse direction of a centrifugal | pe as a dirty water pump according to a preferred embodiment of the invention | The centrifugal pump has a motor housing 1 made of stainless steel, which is on a pump | pen housing 2 is made of plastic. In the motor housing 1 is a drive motor | 3, shown in FIG. 3, is provided, which has a vertical | Shaft provided in a pump chamber 4 formed by the pump housing 2 | nes impeller 5 for pumping water drives as a fluid. The cylinder-like engine housing | se 1 is coaxial on the outside of its lateral surface surrounding a cooling jacket space.

6 forming cylindrical Kithlmantel 7 surrounded. The cooling jacket 7 is in the drawing | shown open in the middle to provide a partial view of the cooling jacket | allow room 6. | | On the one hand, a tubular cooling jacket inlet 8 is provided in the cooling jacket space 6, | which opens out of the pump chamber 4 into the cooling jacket chamber 6. The cooling jacket inlet 8 : opens into the pump chamber 4 in an overpressure region of the pump chamber 4 in a . so-called edge side space 9, so that the impeller rotates fluid through the cooling | jacket inlet 8 into the cooling jacket space 6. The tubular cooling jacket inlet | 8 is a stainless steel tube 10 from the pump chamber 4 first in the drawing | tion plane vertically upwards into the pump chamber 4 and bends in the cooling jacket.

space 6 for forming a circular flow towards its end with a radius | from 28 mm bent over 60°. | On the other hand, | a cooling jacket outlet 11 is provided, which is in the cooling jacket space 6 parallel to the.

LU101956 Ÿ stainless steel pipe 10 or the tubular cooling jacket inlet 8. The cooling jacket | Flow 11 opens inside the pump housing 2 but outside the pump chamber 4, namely in an intake area of the impeller 4 on the inflow side and thus in a negative pressure area in front of the pump chamber 4 hener strainer 12 covers the Kiithlmantelauslass 11, as well as from a sectional view | 2 showing a lower part of the centrifugal pump according to FIG. 1 in the longitudinal direction. is evident. By returning the fluid from the pump chamber 4, a | Entry of solids in the marginal side space 9 is minimized and the operational reliability of the. Centrifugal pump improved. | As can be seen in particular in FIG. 1, in the cooling jacket space 6 there is also a stainless steel.

Steel existing pipe 13 is provided, which at a first end of the cooling jacket: space 6 opens into the cooling jacket outlet 9 or from this from the cooling jacket; outlet 9 in the cooling jacket space 6 continues. The tube 13 extends into the cooling man-.

telraum 6 axis parallel to an axis of the impeller 4 in the plane of the drawing perpendicular: upwards to a second end opposite to the first end of the. Cooling jacket space 6 and opens at the second end into the cooling jacket space 6. The tube; 13 also bends over 60 degrees at the second end with a radius of 28 mm off. At the first end, the tube 13 has a first vent opening 14 with a | Diameter of 6 mm for discharging solids of greater density and/or weight | on. ! Fig. 3 shows a schematic, partially transparent centrifugal pump as part of a lifting system: on the left and a sectional view of the centrifugal pump as a lifting system according to a further right.

more preferred embodiment of the invention. As can be seen in the figure on the left, . the tube 13 is bent through 180 degrees at the second end and extends parallel to the axis | back to the first end. At the first end, the tube 13 opens into the cooling | jacket space 6 and bends in turn with a radius of 28 mm over 60 degrees 'from. In the bent portion is a second vent hole 14 for discharging | Solids of low density and / or weight provided. |

LU101956 | Finally, Fig. 4 shows a sectional view of a lower part of a centrifugal pump as an example water pump according to a further preferred embodiment of the invention. Ne- | A second pipe 16 is provided in the cooling jacket space next to the pipe 13, which at the first end of the cooling jacket space 6 leads on the one hand into the cooling jacket outlet 11 and on the other | Terseits in the cooling jacket space 6 opens. The second tube 16 extends parallel to the tube 13 but is shorter. For the tube 13 and the second tube 16 is a respective; Cooling jacket outlet 11 provided. The shorter second tube 16 is sufficient; Funded fluid back into the pump housing 2, so that the risk of a sudden | AbreiBens the fluid flow in the pump chamber 4 is banned. The stainless steel tube, the tube 13 f and the second tube 16 each have a diameter of 8 mm. 'By the described recirculation of the fluid out of the pump chamber 4, a; Reduced entry of solids in the edge side space 6, whereby the Betriebssi- | improved safety of the centrifugal pump, since such a blocking of the impeller 5 by an- |; otherwise towards the impeller 5 funded solids is reduced. Similarly, a | Sedimentation of the cooling jacket space 6 is reduced or even completely reduced over time Avoided because through the cooling jacket chamber 6 funded solids through the cooling jacket.

let 11 be conveyable in particular into a suction mouth of the centrifugal pump. | The exemplary embodiments described are only examples that are part of the An-. sayings can be modified and/or supplemented in many ways. Each feature, .

that has been described for a specific embodiment can stand alone or in | Combination with other features in any other embodiment, are used. Any feature that is required for an embodiment of a particular category | Gorie was described, can also in a corresponding manner in a Ausführungsbei- | game of another category. |

LU101956 |

List of reference symbols Ë motor housing 1 | Pump housing 2 |

drive motor 3 | Pump room 4 | Impeller 5, cooling jacket space 6' cooling jacket 7 |

Cooling jacket inlet 8 | Edge side space 9 : stainless steel tube 10 ' cooling jacket outlet 11 | strainer 12 |

tube 13; First vent 14' Second vent 15' Second pipe 16'

Claims (11)

Patent Claims | 1. Centrifugal pump with a motor housing (1) with a motor housing (1) attached | arranged drive motor (3) and on the motor housing (1) arranged a | Pump housing (2) forming the pump chamber (4) with a pump chamber (4) | arranged and driven by the drive motor (3) impeller (5) for conveying ei | nes fluid, where | the motor housing (1) extends coaxially from a cooling jacket space (6) on the outside | forming cooling jacket (7) is surrounded, | the cooling jacket space (6) from the pump space (4) into the cooling jacket space | (6) opening into the cooling jacket inlet (8) through which the impeller (5) ge- | conveyed fluid can flow into the cooling jacket space (6), and | the cooling jacket space (6) inside the pump housing (2) and outside | of the pump chamber (4) opening out cooling jacket outlet (11) through which the | Fluid can flow out of the cooling jacket space (6). | 2. Centrifugal pump according to the preceding claim, wherein the cooling jacket outlet (11) | opens into an intake area of the impeller (5) in front of the pump chamber (4) and/or the | Cooling jacket outlet (11) opens on the inflow side in front of the pump chamber (4). | | 3. Centrifugal pump according to one of the preceding claims, wherein the cooling jacket unit | let (8) is arranged in an overpressure area of the pump chamber (4) and/or the | Cooling jacket outlet (11) arranged in a vacuum area of the pump housing (3) | is. | 4. Centrifugal pump according to one of the preceding claims, wherein the pump housing (2) has a suction strainer (12) provided on the inflow side in front of the pump chamber (4). and the cooling jacket outlet (11) is covered by the strainer (12). 5. Centrifugal pump according to one of the preceding claims, with a pipe (13) provided in the cooling jacket space (6), which on the one hand opens into the cooling jacket outlet (11) at a first end of the cooling jacket space (6), extends axially parallel to an axis of the Impeller (5) to a second opposite to the first end End of the cooling jacket space (6) extends and on the other hand at the second end in the | Cooling jacket space (6) opens. | 6. Centrifugal pump according to the preceding claim, wherein the pipe (13) at the first: th end of the cooling jacket space (6) has a first vent opening (14). | 7. Centrifugal pump according to one of the two preceding claims, wherein the tube (13) | is bent at the second end, back to the first end in an axis-parallel manner | extends and at the first end opens into the cooling jacket space (6). | ; 8. Centrifugal pump according to the preceding claim, wherein in the curved region | a second vent opening (15) is provided. Ë 9. Centrifugal pump according to one of the four preceding claims, with a second in: the cooling jacket space (6) provided tube (16) which at the first end of the cooling | jacket space (6) on the one hand in the cooling jacket outlet (11) and on the other hand in the cooling: jacket space (6) opens. | 10. Centrifugal pump according to one of the preceding claims, wherein the centrifugal pump | designed as a submersible pump or lifting station. | 11. Use of a centrifugal pump according to one of the preceding centrifugal pumps | Claims as a submersible sewage and/or sewage pump or in a lifting plant | ge. |