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
  • F04D29/18—Rotors
  • F04D29/22—Rotors specially for centrifugal pumps
  • F04D29/2205—Conventional flow pattern
  • F04D29/2222—Construction and assembly
• • 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
  • F04D29/18—Rotors
  • F04D29/20—Mounting rotors on shafts
• • 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
  • F04D29/18—Rotors
  • F04D29/22—Rotors specially for centrifugal pumps
  • F04D29/2261—Rotors specially for centrifugal pumps with special measures
  • F04D29/2266—Rotors specially for centrifugal pumps with special measures for sealing or thrust balance

Definitions

• the invention relates to a centrifugal pump impeller according to the preamble of the main claim.
• Impellers made in sheet metal construction are known in a wide variety of configurations.
• the problem is to design the impellers made of the thin-walled material in such a way that they reliably absorb the forces that occur during operation and that the impellers are non-rotatably and stably connected to the pump shaft.
• the attachment is carried out by means of a pressure-side hub disk, which is attached to a flat surface of the pressure-side impeller cover disk and transmits torque, runs at a distance from the pressure-side impeller cover disk and thus forms a second contact point for the impeller on the pump shaft . It is attached by bracing on a conical surface of the pump shaft.
• the invention has for its object to find a simple and versatile construction for impellers made in sheet metal construction, which does not have the known disadvantages. This object is achieved in accordance with the characterizing part of the main claim.
• the use of only a single pressure-side impeller cover plate for a single series results in additional advantages in addition to a considerable reduction in parts.
• sheet blanks of different diameters are used in the manufacture.
• the use of the hub disk has a known curvature in the connection area with the pressure-side impeller cover disk and rests on the rear part of the inlet area of the impeller. When the pump shaft is reached, the course of the hub disc changes in the axial direction and there is a connection to the pump shaft by known means.
• the minimal dead space remaining between the hub bushing and the impeller cover disk, which is dependent on the bending radius, can be made liquid-tight in a simple manner, for example by means of sealing means, so that the impeller can be cleaned without problems. Liquid residues or cleaning agents can no longer get stuck in the impeller.
• the flow cross-section can be adjusted by means of an offset arrangement of the axial thrust compensation openings in the pressure-side impeller cover disc and the hub disc. This makes it easy to adapt the impeller to the respective flow conditions or operating conditions.
• the suction-side impeller cover disc consists of two parts, the cover disc part arranged in the radial impeller region having the same or greater wall thickness than the cover disc part arranged in the axial and / or semi-axial impeller region.
• the lightly loaded inlet area of the impeller can be designed as a unit-lip part for all impellers of a series, which is a material-saving component of low wall thickness.
• a thicker and / or higher-quality material is used in accordance with the respective strength requirements. This means that simple tools can be used to manufacture it, and a larger number of impellers can be created with fewer tools.
• impeller cover disk on the pressure side is designed as a washer in the area of the hub attachment.
• the ring of the hub disk to be connected to the shaft has one or more corrugations running in the axial direction and corresponding openings.
• These beads in the hub disc can have a variety of functions. On the one hand, they can form an abutment for a known tongue and groove connection. Furthermore, a pulling tool for dismantling the pump impeller can be inserted through the beads. And furthermore the beads allow ventilation of a mechanical seal space, which is located immediately behind the impeller cover and within the space delimited by the hub plate. An arrangement that ensures a significant reduction in overall length. And finally I can also relieve axial thrust.
• the hub disk is designed in several parts.
• the ring forming the split ring can be part of a tube and, if necessary, connected to an L-shaped hub disk to form a uniform whole, the ring forming the split ring being able to be designed as a single component for a series.
• Fig. 5 shows a cross section along the line V-V in
• an impeller 3 made in sheet metal construction is arranged within a pump housing 1, which is fastened to a carrier 2.
• the carrier 2 can be either a separate bearing chair or a block motor directly connected to the pump housing.
• the impeller 3 is connected to the pump shaft 4 by a serration 5.
• the attached to the impeller 3 on the pressure-side cover disk 6, here U-shaped hub disk 7 is supported with the End of the ring 8 extending in the direction of the shaft axis on the pump shaft 4.
• a nut 9 acts with a washer 10 on the pressure-side cover plate 6 and holds the impeller 3 on the pump shaft 4.
• the disk 11, which extends from the ring 8 in the radial direction or the central part of the U-shaped hub disk 7 shown here, has a shape which corresponds to the impeller contour on the pressure side. Thus, only a very small dead space 12 remains between the impeller 3 and the hub disc 7. This can be sealed and / or sealed by simple known means. close or fill in.
• FIG. 2 shows an embodiment in which the impeller 3 is fastened on the pump wall 4 by means of a bushing 13, a known tongue and groove connection being used between the bushing and the pump shaft.
• the hub disk 17 is firmly connected to the bushing 13 by the ring 8.
• the impeller cover disk 6 on the pressure side has a molded disk 14 in the hub area. This serves as a washer for the nut 9 and ensures a secure axial attachment of the impeller 3 on the pump shaft 4.
• an outer ring of the U-shaped hub disk 7 protruding from the impeller forms the race 15 of a split ring seal.
• a mechanical seal 16 can advantageously be arranged within the space enclosed by the race 15, which enables a very short construction of the centrifugal pump.
• 2 shows a two-part embodiment of the U-shaped hub disk. It consists here of an L-shaped hub disk 17 which is welded to a race 15 designed as a tubular individual part. t.
• the embodiment of the impeller 3 shown in FIG. 3 has an L-shaped hub disk 17 for an embodiment without a pressure-side split ring seal.
• connection between the pressure-side cover disk 6 and an L-shaped or U-shaped hub disk 17 or 7 can be made by a weld seam 18 shown here and / or by spot welds, not shown.
• the connection between the pump shaft 4 and the impeller 3 takes place with the interposition of a bushing 13.
• the cross-section of the opening 22 in the hub disk 17 and the cover disk 6 which serves to relieve the axial thrust can be changed.
• the flow cross-section can be varied between zero and open by an offset arrangement of the cover disk and hub disk. This means that the impeller can be adapted to the prevailing conditions without difficulty during manufacture.
• the cross section can have both round and angular shapes.
• the U-shaped hub disk is also formed here in two parts and consists of an L-shaped hub disk 17, the ring protruding from the impeller 3 forming the race ring 15 of a split ring seal.
• the ring 8 connected to the pump shaft 4 is designed as a tubular individual part and welded to the disk 11.
• the suction-side impeller cover plate is here, as in Fig. 3, made in two parts.
• a thin-walled cover plate 23 covers the entry area of the impeller. In the radial impeller area, which is heavily loaded by hydraulic and centrifugal forces, a cover plate 24 with a larger wall thickness is attached.
• the annular cover disks are connected to one another by a circumferential weld seam 25.
• the impeller can be subjected to a greater load.
• 5 shows, according to section VV from FIG. 4, how the embodiment shown in FIG. 4 is connected to the pump shaft 4.
• the inner ring 8 of the hub disk running in the direction of the axis of rotation has beads 19, 20 running in the axial direction.
• the bead 20 has a rectangular cross section and serves as an abutment for a driver 21 inserted in the pump shaft 4.
• the beads 19 perform a multiple function. On the one hand, they act as a vent hole for the mechanical seal space located behind the impeller, and on the other hand, aids can be introduced through the beads, which pull the impeller off the pump shaft. Furthermore, they can serve to relieve axial thrust.

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=6270788

Family Applications (1)

Country Status (4)

Cited By (6)

Families Citing this family (6)

Citations (12)

Family Cites Families (7)

• 1985
  • 1985-05-15 DE DE19853517499 patent/DE3517499A1/de active Granted
• 1986
  • 1986-05-09 EP EP19860903204 patent/EP0260261A1/de not_active Withdrawn
  • 1986-05-09 WO PCT/DE1986/000192 patent/WO1986006799A1/de unknown
  • 1986-05-13 CN CN198686103305A patent/CN86103305A/zh active Pending

Patent Citations (12)

Non-Patent Citations (1)

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