Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/08—Sealings
  • F04D29/086—Sealings especially adapted for liquid pumps
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/40—Casings; Connections of working fluid
  • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
  • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps

Definitions

• the invention relates to a centrifugal pump with at least one impeller rotatably connected to a shaft and a housing having parting lines.
• Centrifugal pumps are based on the principle of action of energy transfer to a fluid by swirl change due to a torque. The energy is transferred from a uniformly rotating impeller to the flowing fluid.
• the centrifugal pump is a work machine according to the direction of the energy flow, according to the type of energy conversion, a turbomachine and the type of fluid, a hydraulic fluid machine. Centrifugal pumps are able to continuously convey even high flow rates to high and highest pressures.
• the housing of the centrifugal pump serves for the liquid-tight and pressure-tight closure of the pump interior to the outside. It encloses the pump rotor, which supplies energy to the pumped medium through wheels on the rotating shaft.
• the pressure range determines the housing shape.
• Low-pressure pumps for example, require constructive solutions other than high-pressure and high-pressure pumps.
• the wall thickness of the housing must be increased.
• the dimensions of the pump housing must comply with both national and international regulations.
• volute casing and multistage high pressure pumps the outer geometrical shapes are adapted to cylindrical, tapered or spherical pump housings. Despite the high internal pressure, these configurations allow a low stress on the pump housing and suitable manufacturing methods for thick-walled (forged) components.
• DE 35 17 828 C2 shows a centrifugal pump with a housing having an axial suction nozzle, a radial discharge nozzle and a pressure-side mounting flange. At the suction nozzle, a connection flange is attached, which is provided with force-dissipating elements.
• the object of the invention is to provide a centrifugal pump whose housing segments are sealed in a simple and reliable manner, so that the centrifugal pump has no leakage even at high delivery pressures.
• the centrifugal pump should be characterized by a cost-effective production method, a reliable mode of operation, as well as a long service life.
• the joints have micro-serrations between the individual housing parts of the centrifugal pump.
• the surfaces between the individual segments have a smooth surface
• the surfaces of adjacent segments are provided in the centrifugal pump according to the invention with a surface structure having a micro-toothing.
• These are not macro forms but structures on the micrometer scale.
• the micro-toothing between the housing parts of the centrifugal pump leads to a high lateral stability. As a result, for example, additional cross-fixing elements can be dispensed with.
• the micro-toothing leads to an unmistakable assignment of the individual housing segments of the centrifugal pump to each other.
• the microstructure allows an exact fit.
• this is an irregular micro-toothing.
• This has interlocking, corresponding forms.
• the centrifugal pump according to the invention is characterized by a high degree of tightness even at high delivery pressures.
• the joints between the individual housing parts in contrast to conventional centrifugal pumps, no longer visible.
• the micro-toothing allows an exact fit, which allows an optimal force transmission between the individual housing parts.
• the centrifugal pump according to the invention is characterized by a very high accuracy of fit and a high load capacity. In addition, the crevice corrosion which frequently occurs in centrifugal pumps is prevented.
• the joints are formed as fracture surfaces, and it proves to be advantageous if it is brittle fracture surfaces.
• a material is used for the pump housing, which has a high brittleness. It has been shown that this favors the separation.
• the pump housing is first manufactured in one piece, for example as a cast component. Then predetermined breaking points are introduced. For example, these can be notch sites that are made by laser.
• a mandrel is preferably driven into the pump housing. The fracture plane is aligned by a targeted arrangement of the notches.
• the predetermined breaking points are chosen so that the micro-toothed parting lines run transversely to the shaft of the centrifugal pump. In this way, a pump housing is created with a transverse distribution.
• the predetermined breaking points can be arranged so that the joints are arranged in a plane to the shaft of the centrifugal pump. According to the invention, this creates a pump housing with a longitudinal division.
• the pump housing is supported in the process. As a result, excessive deformation in the region of the fracture plane can be avoided.
• the micro-toothed parting lines run through a suction nozzle and / or a discharge nozzle of the centrifugal pump. Preferably, this is a longitudinal division.
• the parting lines can also run through housing areas through which the shaft is led out. In these areas, a seal is arranged between shaft and housing.
• At least one parting line divides the housing into a segment which surrounds the impeller and a segment which surrounds the radial and / or axial bearings and thus forms the bearing housing.
• FIG. 1 shows a centrifugal pump with an impeller 1, which is fixed to a shaft 2.
• the centrifugal pump comprises a housing 3, which surrounds a space 4 filled with liquid.
• the housing 3 is a spiral housing in the exemplary embodiment.
• the impeller 1 is rotatably disposed in the housing 3.
• the housing 3 has a suction nozzle 5 and a discharge nozzle 6.
• the shaft 2 is driven by a motor, which is not shown in Figure 1.
• the shaft 2 is guided by bearing assemblies 7.
• the bearing assemblies 7 include radial bearings and / or thrust bearings.
• the housing 3 is divided transversely to the shaft 2 in the embodiment.
• a segment 8 of the housing 3 surrounds the impeller 1 together with the liquid-filled space 4.
• Another segment 9 of the housing 3 surrounds a part of the shaft 2.
• Another segment 13 surrounds the bearing assemblies 7, which includes radial and / or thrust bearing. Due to the transverse division, the housing 3 is subdivided into the segments 8, 9 and 13.
• FIG. 2 shows an enlarged illustration of the detail A according to FIG. 1.
• the parting line 10 has irregular micro-toothings.
• the parting line 10 is formed by two adjoining surfaces.
• the surfaces have elevations 11 and depressions 12.
• the elevations 11 and depressions 12 are interlocking, mutually corresponding shapes on the micrometer scale.
• the parting line 10 is formed by two fracture surfaces. These are brittle fracture surfaces.
• the surfaces are generated by fracture separation.
• a predetermined breaking point is introduced as a notch in the housing 3 and then exerted by means of a mandrel a force to this predetermined breaking point, so that the housing 3 breaks.
• the housing 3 is divided into a segment 8, a segment 9 and a segment 13.
• the segment 8 surrounds the impeller 1 and the fluid.
• the segment 9 surrounds a part of the shaft 2.
• the segment 13 surrounds the bearing assembly 7, which includes radial and thrust bearings.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=54251517

Family Applications (1)

Country Status (5)

Citations (5)

Family Cites Families (7)

• 2014
  • 2014-10-08 DE DE102014220364.3A patent/DE102014220364A1/de not_active Withdrawn
• 2015
  • 2015-10-06 EP EP15774925.0A patent/EP3204651B1/de active Active
  • 2015-10-06 WO PCT/EP2015/072993 patent/WO2016055444A1/de active Application Filing
  • 2015-10-06 ES ES15774925T patent/ES2809520T3/es active Active
  • 2015-10-06 DK DK15774925.0T patent/DK3204651T3/da active

Patent Citations (5)

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