NO344723B1

NO344723B1 - Centrifugal pump

Info

Publication number: NO344723B1
Application number: NO20180691A
Authority: NO
Inventors: Tore Hystad
Original assignee: Tore Hystad
Priority date: 2018-05-16
Filing date: 2018-05-16
Publication date: 2020-03-23
Also published as: EP3810314A1; WO2019221610A1; EP3810314B1; EP3810314A4; EP3810314C0; NO20180691A1

Description

Sammendrag : Summary :

Sentrifugalpumpe der sentralt plassert impeller/akselsystem er eliminert og erstatta av ein eller fleire aktive propellar som er tangensielt plassert i det fluidumfylte pumpehuset. Aksialkrafta frå propellsystemet set fluidumet i rotasjon, både direkte i propellstråla og ved viskøse krefter i resten av pumpehuset, slik at det oppstår tangensiell og radiell hastighet gjennom pumpa og derved trykk og kapasitet. Centrifugal pump where the centrally located impeller/shaft system is eliminated and replaced by one or more active propellers that are tangentially located in the fluid-filled pump housing. The axial force from the propeller system sets the fluid in rotation, both directly in the propeller jet and by viscous forces in the rest of the pump housing, so that tangential and radial velocity occurs through the pump and thereby pressure and capacity.

Forklaring : Explanation :

Oppfinninga gjeld ein ny type sentrifugalpumpe. Etter dagens teknikk er sentrifugalpumper enkle og driftsikre maskinar som består av : 1) Fastståande pumpehus med inn- og ut-løp og sentralt plassert lagerhus. The invention relates to a new type of centrifugal pump. According to current technology, centrifugal pumps are simple and reliable machines that consist of: 1) Fixed pump housing with inlet and outlet and centrally located storage housing.

2) Impeller opplagra i lagerhuset, og brakt til å rotera av ein motor. Pumpemediet blir ført inn aksialt i impelleren og av denne tilført kinetisk energi i form av tangensiell og radiell hastighet. Ein del av hastigheten blir retardert i den rommelege perifere delen av huset, dermed blir det trykkstigning i mediet. 2) Impeller stored in the bearing housing, and brought to rotate by a motor. The pump medium is introduced axially into the impeller and by this added kinetic energy in the form of tangential and radial speed. Part of the speed is retarded in the spacious peripheral part of the housing, thus causing a pressure rise in the medium.

Eit kjent problem ved dagens teknikk er at impelleren lett blir tetta eller skada dersom pumpemediet inneheld større faste eller seige element. Dersom dei faste/seige elementa er ømtålige, blir også desse lett skada ved passering av impelleren. Problemet er tidlegare søkt løyst ved at impelleren, med opne skovlar, er trekt ut av fluidumstraumen, slik at den dannar ein roterande virvel i pumpehuset som overfører rotasjonen til fluidumstraumen ved viskøse krefter, noko som medfører dårleg effektivitet. Patent NO 337153 B1 viser også eit forsøk på å løysa problemet, metoden er komplisert og skiller ikkje problemelement effektivt frå impelleren. A known problem with current technology is that the impeller is easily clogged or damaged if the pumping medium contains larger solid or tough elements. If the solid/tough elements are delicate, these are also easily damaged when passing through the impeller. The problem was previously sought to be solved by the impeller, with open vanes, being pulled out of the fluid stream, so that it forms a rotating vortex in the pump housing which transfers the rotation to the fluid stream by viscous forces, which results in poor efficiency. Patent NO 337153 B1 also shows an attempt to solve the problem, the method is complicated and does not effectively separate the problem element from the impeller.

Eit kjent problem ved dagens teknikk er også at storkapasitets sentrifugalpumper blir svært kostbare i innkjøp og drift: Lågt omdreiningstal og stor effekt krev kraftig aksel/lager/tetningssystem, ofte er ein kraftig gearboks nødvendig for optimal drift. Støyping og nøyaktig maskinering av grove metalldeler som impeller, pumpehus og aksel er dyrt, også vedlikehold/service er kostbart. A known problem with today's technology is also that large-capacity centrifugal pumps are very expensive to purchase and operate: Low rpm and high power demand a powerful shaft/bearing/sealing system, often a powerful gearbox is necessary for optimal operation. Grinding and precise machining of rough metal parts such as impeller, pump housing and shaft is expensive, maintenance/service is also costly.

Ei sentrifugalpumpe etter oppfinninga har eit stort sett tradisjonelt pumpehus 1, med innløp 2 for fluidumet i sentrum og utløp 3 i periferien. Impeller/akselsystem i sentrum er eliminert. Ein (eller fleire) motordreven propell 4 er plassert i fluidumet tangensielt til huset. Når propellen blir aktivert i fluidumet blir dette sett i rotasjon i huset, både direkte av propellstråla og ved viskøse krefter i resten av husvolumet. Sentrifugalkaft og ein viss retardason av fluidumet i utløpet gir trykkstigning og kapasitet. Propellen har stigning som er tilpasst etter pumpekarateristikken og motoromdreiningstalet, ein kan nytta ein mindre, hurtiggåande motor utan nedgiring. Også aksel/opplagring/tetning system blir forminska og forenkla. Pumpehuset blir forenkla, og krev lite maskinering. Ei rist 5 kan plasserast på innløpssida til propellen, og utformast slik at større faste, seige eller ømtålige element ungår kontakt med denne. Alternative plasseringar av den tangensielle propellen er viste på figur 3. Propell med aksling, lager, lagerhylse, tetning, monteringsflens og motor/motorkobling (figur 4) kan enkelt bygjast saman som ei eining 6 som enkelt kan takast ut av pumpehuset for service/rensing/kontroll ved å løysa monteringsflensen 8. For å optimalisera pumpa ved ulike eller kontinuerleg varierande driftsforhold kan propellen ha stillbar eller kontinuerlig regulerbar stigning, eller regulerbare ledeskovlar. Pumpa er ikkje sjølvsugande, ved plassering over væskeflata må sugeledning normalt ha tilbakeslagsventil. Ved plassering under væskeflata kan vanntett motor nyttast, eller motoren kan monterast over væskeflata med forlengd aksling, (figur 5). A centrifugal pump according to the invention has a largely traditional pump housing 1, with inlet 2 for the fluid in the center and outlet 3 in the periphery. Impeller/shaft system in the center has been eliminated. One (or more) motor-driven propeller 4 is placed in the fluid tangential to the housing. When the propeller is activated in the fluid, this is seen in rotation in the housing, both directly by the propeller jet and by viscous forces in the rest of the housing volume. Centrifugal shaft and a certain retardation of the fluid in the outlet give rise in pressure and capacity. The propeller has a pitch that is adapted to the pump characteristics and the engine speed, you can use a smaller, fast-running engine without a downshift. The axle/support/sealing system will also be reduced and simplified. The pump housing is simplified and requires little machining. A grate 5 can be placed on the inlet side of the propeller, and designed so that larger solid, tough or delicate elements avoid contact with it. Alternative locations of the tangential propeller are shown in figure 3. Propeller with shaft, bearing, bearing sleeve, seal, mounting flange and motor/motor coupling (figure 4) can be easily assembled as a unit 6 which can be easily removed from the pump housing for service/cleaning /check by loosening the mounting flange 8. To optimize the pump under different or continuously varying operating conditions, the propeller can have adjustable or continuously adjustable pitch, or adjustable guide vanes. The pump is not self-priming, when placed above the liquid surface, the suction line must normally have a non-return valve. When placed under the liquid surface, a waterproof motor can be used, or the motor can be mounted above the liquid surface with an extended shaft, (figure 5).

Patent GB 190313384 A omhandlar smøreoljeforsyning til turbinlagring. Dette dreier seg om små pumper for reint medium, og er ikkje relevant for oppfinninga. Patent US 1,720,333 viser ei aksialpumpe (propeller) som er montert i eit 90 gr. bend som så er montert sentralt i ein veskestraum med vesentleg større diameter. Viskøse krefter drar med seg mediumet som i oppfinninga, men ingen rotasjon/setrifugalkraft blir utnytta som i oppfinninga. Patent GB 190313384 A deals with lubricating oil supply for turbine bearings. This concerns small pumps for pure medium, and is not relevant to the invention. Patent US 1,720,333 shows an axial pump (propeller) which is mounted in a 90 gr. bend which is then mounted centrally in a bag stream with a significantly larger diameter. Viscous forces drag the medium along as in the invention, but no rotation/centrifugal force is utilized as in the invention.

Claims

Patent claims

1. Centrifugal pump without a traditional centrally located impeller, characterized in that rotation of the fluid and thus pressure rise and capacity is achieved by one or more active propellers (4) being placed inside the pump housing (1) with the propeller vector approximately tangential to the rotated fluid.

2. Centrifugal pump according to claim 1, where the propeller (4) with an adapted grate (5) on the inlet side acts directly on a limited part of the fluid, so that harmful or sensitive elements in the fluid can pass through the pump unhindered and without contact with the propeller.

3. Centrifugal pump according to requirements 1-2, where the propeller (4) can be placed at an optimal distance from the pump centre, regardless of pump housing diameter.

4. Centrifugal pump according to claims 1-3, where the propeller (4) is placed in a pocket or pipe (7) on the housing side or the housing periphery or where a propeller nozzle or equivalent encloses the propeller

5. Centrifugal pump according to claims 1-4, where the propeller with shaft, bearing, bearing sleeve, seal, mounting flange (8) and motor/motor coupling are assembled together as a unit (6) which can be easily released from the pump housing by loosening the mounting flange, so that service and inspection of these parts will be simplified.

6. Centrifugal pump according to claims 1-5, where the fast-rotating propeller (4) with optimized pitch is directly connected to the fast-rotating drive unit, so that a hydrodynamic downshift system is obtained.

7. Centrifugal pump according to claims 1-6, where the pump is immersed in the fluid while the motor is placed above the liquid surface on an extended propeller shaft.

8. Centrifugal pump according to claims 1-7, where the propeller (4) has rotatable blades, possibly rotatable guide vanes, so that the pitch of the propeller can be adapted to different or varying operating conditions.