Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
  • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D3/00—Axial-flow pumps
  • F04D3/02—Axial-flow pumps of screw type
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
  • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
  • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
  • F04D7/045—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous with means for comminuting, mixing stirring or otherwise treating

Definitions

• the present invention relates to a liquid ring screw pump, including a housing with a suction inlet part and a pressure outlet part and within the housing rotatably provided Archimedes screw driven by a motor via a shaft.
• the suction inlet of the liquid ring screw pump includes a suction chamber with a particle trap where any un-wanted solid particles such as coins or other metal devices are trapped and thereby prevented form entering and damaging the grinder or screw.
• the suction chamber is provided with a lid or removable cover enabling access to the trap to remove trapped particles and inspection of the inlet and rotating components, i.e. the grinder and screw.
• the lid is commonly fastened to the suction chamber by means of a flange connection with screws and nuts the lid is cumbersome to remove and takes time open.
• the invention is characterized by the features as defined in the attached independent claim 1.
• Fig. 1 shows a liquid ring screw pump with a suction chamber front lid or cover according to the known (prior art) solution
• Fig. 2 shows a liquid ring screw pump with a suction chamber front lid or cover according to the invention.
• Fig. 3 shows an expanded view of the same liquid ring screw pump as is shown in Fig. 2.
• Fig. 4 shows in larger scale a cross sectional view of the suction chamber with the lid or cover shown in Figs. 2 and 3.
• Fig. 1 shows, as stated above, an example of a known liquid ring screw pump 1 including a housing 2 with a suction inlet part 4 (chamber) and a pressure outlet part 3 and within the housing rotatably provided Archimedes screw (not shown) driven by a motor 6 via a shaft (neither not shown).
• the inlet part 4 further includes a suction chamber which is provided with a front cover or lid 5.
• the cover is fastened to the suction chamber by means of a flange connection where the cover 5 is attached to a flange 7 on the suction chamber with a plurality of screw and nuts 14 in through-going holes.
• This known solution is secure, but quite cumbersome and time consuming to detach.
• the solution is as well expensive to manufacture due to the many holes to drill and number of screws and nuts being used.
• Fig. 2 shows as well a liquid ring screw pump 1 , but with a front cover or lid 5 according to the invention.
• Figs. 3and 4 depicting respectively an expanded view and cross section, shows in more detail the simple and inventive cover solution according to the invention.
• the cover 5 is attached to the suction chamber 4 of the pump 1 by means of a locking ring 8 and with a sealing element in the form of an O-ring 9 provided between the cover 5 and chamber 4.
• the locking ring may be any ring capable of attaching the cover to the chamber, but preferably as shown in Fig.
• the cover or lid 5 is transparent and made of a thermoplastic polymer such as Poly (methyl methacrylate) (PMMA), Polycarbonate marketed under the trade names Plexiglas ® and LexanTM respectively, or Poly Vinyl Chloride (PVC).
• PMMA Poly (methyl methacrylate)
• PVC Poly Vinyl Chloride
• the cover 5 and the locking ring 8 may be made of any suitable material such as metal or suitable composite polymer.
• the locking ring 8 is provided with transversal wing or holding element 13 that makes it easier to obtain a grip with the hand when twisting the ring on or off the cover (when mounting or de-mounting the cover).
• transversal wing or element merely represents an option and is not a requirement.
• the locking ring 8 may preferably also be provided with a safety arrangement (not further shown) to avoid unintentional opening of the locking ring 8 and further avoiding injury to hand/fingers (caused by the grinder).

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Rotary Pumps (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=49916370

Family Applications (1)

Country Status (2)

Families Citing this family (1)

Family Cites Families (10)

• 2013
  • 2013-07-04 EP EP13816303.5A patent/EP2870366A4/de not_active Withdrawn
  • 2013-07-04 WO PCT/NO2013/000028 patent/WO2014011054A1/en not_active Ceased

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