WO2014011054A1 - Liquid ring screw pump end cover - Google Patents

Liquid ring screw pump end cover Download PDF

Info

Publication number
WO2014011054A1
WO2014011054A1 PCT/NO2013/000028 NO2013000028W WO2014011054A1 WO 2014011054 A1 WO2014011054 A1 WO 2014011054A1 NO 2013000028 W NO2013000028 W NO 2013000028W WO 2014011054 A1 WO2014011054 A1 WO 2014011054A1
Authority
WO
WIPO (PCT)
Prior art keywords
cover
ring
screw pump
chamber
liquid ring
Prior art date
Application number
PCT/NO2013/000028
Other languages
French (fr)
Inventor
Olav Hofseth
Tor RØNNESTAD
Original Assignee
Jets As
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jets As filed Critical Jets As
Priority to EP13816303.5A priority Critical patent/EP2870366A4/en
Publication of WO2014011054A1 publication Critical patent/WO2014011054A1/en

Links

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)

Abstract

Liquid ring screw pump (1) including a housing (2) with a suction inlet part (4) and a pressure outlet part (3) and within the housing (2) rotatably provided Archimedes screw rotor driven by a motor (6) via a shaft, the inlet part (4) further including a suction chamber (4) which is provided with a front cover or lid (5). 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 a O-ring (9) provided between the cover (5) and chamber (4).

Description

"Liquid ring screw pump end cover"
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.
Pumps of the above-mentioned kind are now commonly used in vacuum sewage systems onboard ships, aero planes and trains. However, such systems are also increasingly being used on land due to reduced water requirement and easy handling and treatment of waste water, as well as its flexibility as regards installation of piping and layout given by such systems.
The applicant of the present application introduced in 1987, cf. EP patent No. 0 287 350, for the first time the novel vacuum sewage system where the vacuum in the system was generated by means of a liquid ring screw pump of this kind where the pump is used as well to discharge the sewage from a vacuum tank or the like to which it is connected. EP patent No. 0 454 794, also filed by the applicant, further shows a revolutionary improvement of a vacuum sewage system where the liquid ring screw pump is provided with a grinder or macerator and is connected directly with the suction pipe of the system, whereby vacuum is generated in the sewage suction pipe and sewage is discharged directly from the system by means of the pump. The present invention may, or may not include such grinder provided at the inlet end of the Archimedes screw rotor.
The suction inlet of the liquid ring screw pump according to the present invention 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.
As 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.
With the present invention is provided a solution which vastly reduces the time to connect and disconnect the lid and thereby reduces the time to perform maintenance, i. e. removal of trapped particles and doing inspections of the inlet and grinder etc. and which is much cheaper than the known flange type connection.
The invention is characterized by the features as defined in the attached independent claim 1.
Advantageous embodiments of the invention are further defined in the attached dependent claims 2 - 4.
The invention will be further described in the following by way of examples and with reference to the drawings where:
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. In the known solution as shown in Fig. 1 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. As can be seen, 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. 3, some kind of twist locking arrangement where the ring is provided with outwardly protruding knobs or threads 10 corresponding to complementary inwardly protruding recesses or threads 1 1 on the chamber 4 and which by twisting of the ring 8 presses the outer edge of the cover 5 with the sealing element 9 towards a corresponding seat 12 on the chamber.
In the present case as shown in Fig. 3, 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 Lexan™ respectively, or Poly Vinyl Chloride (PVC). However, the cover 5 and the locking ring 8 may be made of any suitable material such as metal or suitable composite polymer.
In the present case as shown in the figures, 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). Such transversal wing or element merely represents an option and is not a requirement.
As the inlet part of the chamber 4 includes a rotating grinder, 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).

Claims

Claims
1. Liquid ring screw pump (1 ) including a housing (2) with a suction inlet part (4) and a pressure outlet part (3) and within the housing (2) rotatably provided Archimedes screw rotor driven by a motor (6) via a shaft, he inlet part 4 further including a suction chamber which is provided with a front cover or lid (5), characterised in that
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 (9) provided between the cover (5) and chamber (4).
2. Liquid ring screw pump according to claim 1 ,
characterised in that
the locking of the ring (8) twist locking arrangement where the ring is provided with outwardly protruding knobs or threads (10) corresponding to complementary inwardly protruding recesses or threads (11) on the chamber (4) and which by twisting of the ring (8) presses the outer edge of the cover (5) with the sealing element (9) towards a corresponding seat (12) on the chamber (4).
3. Liquid ring screw pump according to claims 1 and 2,
characterised in that
cover is transparent and made of is transparent and made of a thermoplastic polymer such as Poly (methyl methacrylate) (PMMA), Poly Vinyl Chloride (PVC) or Polycarbonate.
4. Liquid ring screw pump according to the previous claims,
characterised in that
the sealing element is in the form of a O-ring (9).
PCT/NO2013/000028 2012-07-09 2013-07-04 Liquid ring screw pump end cover WO2014011054A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13816303.5A EP2870366A4 (en) 2012-07-09 2013-07-04 Liquid ring screw pump end cover

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20120795 2012-07-09
NO20120795 2012-07-09

Publications (1)

Publication Number Publication Date
WO2014011054A1 true WO2014011054A1 (en) 2014-01-16

Family

ID=49916370

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2013/000028 WO2014011054A1 (en) 2012-07-09 2013-07-04 Liquid ring screw pump end cover

Country Status (2)

Country Link
EP (1) EP2870366A4 (en)
WO (1) WO2014011054A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111771062A (en) * 2018-02-22 2020-10-13 美蓓亚三美株式会社 Blower device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020094288A1 (en) * 2000-10-27 2002-07-18 Peter Bussmann Closure system for a cylindrical plastics casing
US20040071573A1 (en) * 2002-02-05 2004-04-15 Johannes Pfetzer Liquid pump
US20040235122A1 (en) * 2003-04-09 2004-11-25 Mechthild Rieping Process for the production of L-amino acids using strains of the enterobacteriaceae family
US20050158194A1 (en) * 2004-01-20 2005-07-21 Sloan Joanne B. Molded pump
US20050180866A1 (en) * 2004-02-17 2005-08-18 Wen-Chang Wang Pump having a removable cover
US20090145498A1 (en) * 2005-11-01 2009-06-11 Joel Brent Bowman Strainer Housing Assembly And Stand For Pump
US20100092276A1 (en) * 2008-09-30 2010-04-15 John Cartwright Chopper pump

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2975714A (en) * 1954-11-01 1961-03-21 Fmc Corp Screw feed centrifugal pump
CA2009905C (en) * 1990-02-13 1994-08-30 Michael Langford Malkoski High density grout pump
NO318776B1 (en) * 2003-05-07 2005-05-02 Jets As Screw-type liquid pump pump device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020094288A1 (en) * 2000-10-27 2002-07-18 Peter Bussmann Closure system for a cylindrical plastics casing
US20040071573A1 (en) * 2002-02-05 2004-04-15 Johannes Pfetzer Liquid pump
US20040235122A1 (en) * 2003-04-09 2004-11-25 Mechthild Rieping Process for the production of L-amino acids using strains of the enterobacteriaceae family
US20050158194A1 (en) * 2004-01-20 2005-07-21 Sloan Joanne B. Molded pump
US20050180866A1 (en) * 2004-02-17 2005-08-18 Wen-Chang Wang Pump having a removable cover
US20090145498A1 (en) * 2005-11-01 2009-06-11 Joel Brent Bowman Strainer Housing Assembly And Stand For Pump
US20100092276A1 (en) * 2008-09-30 2010-04-15 John Cartwright Chopper pump

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2870366A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111771062A (en) * 2018-02-22 2020-10-13 美蓓亚三美株式会社 Blower device

Also Published As

Publication number Publication date
EP2870366A1 (en) 2015-05-13
EP2870366A4 (en) 2016-05-18

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