DK9500096U3

DK9500096U3 - Pump for high viscosity or solid media

Info

Publication number: DK9500096U3
Application number: DK9500096U
Authority: DK
Inventors: Niels Moeldrup
Original assignee: Svanehoej International A S
Priority date: 1995-03-14
Filing date: 1995-03-14
Publication date: 1996-06-14

Description

DK 95 00096 U3DK 95 00096 U3

TEKNIKKENS STANDPUNKTBACKGROUND OF THE ART

Frembringelsen angår en pumpe til højviskose eller fast-stofholdige medier, og til tømning af tanke, især skibstan-5 ke, og omfattende en centrifugalpumpe, der ved sit indløb er forsynet med en skruecentrifugalpumpe, således at pumperne er drivbart forbundne til samme aksel.The production relates to a pump for high viscous or solid media, and for emptying tanks, especially ship tanks, and comprising a centrifugal pump, which at its inlet is provided with a screw centrifugal pump, so that the pumps are operably connected to the same shaft.

En pumpe af denne type fremstilles af ansøgeren. Centrifu-10 galpumpedelen er udført med flere trin, og indløbet til centrifugalpumpen er åbent ud til skruecentrifugalpumpens løbehjul. Dette løbehjul er åbent og udført med én kanal.A pump of this type is manufactured by the applicant. The centrifugal pump part is made with several steps and the centrifugal pump inlet is open to the screw centrifugal pump impeller. This scooter is open and made with one channel.

At hjulet har én kanal betyder, at der kun er én pumpeskovl; denne forløber skrueformet og tæt sluttende til pum-15 pehuset. Huset omkring løbehjulet er keglestubformet med den største diameter vendende mod centrifugalpumpens indløb. Skruecentrifugalpumpedelen har som funktion at forbedre ansugningsevnen for pumpen ved pumpning af højviskose medier, f.eks. melasse.The fact that the wheel has one channel means that there is only one impeller; this extends helical and tightly adjoins the pump-15 housing. The housing around the impeller is cone-shaped with the largest diameter facing the centrifugal pump inlet. The function of the screw centrifugal pump part is to improve the suction capacity of the pump by pumping high viscous media, e.g. molasses.

2020

Skruecentrifugalpumper er kendt i sig selv fra anden side, f.eks. til pumpning af slamholdigt vand eller partikelhol-dige væsker, hvor de anvendes alene ved små løftehøjder. Fordelen ved skruecentrifugalpumperne er primært, at store 25 partikler kan passere uden at klemmes fast. Det kendte skruecentrifugalhjul har den ulempe, at hjulet ikke er afbalanceret hydraulisk. Under drift opstår der radielle kræfter, som skal optages af akslens lejer. Ved de sædvanlige anvendelser af skruecentrifugalpumpen, hvor den er 30 monteret selvstændigt, er dette ikke noget problem, idet lejringen kan gøres tilstrækkeligt kraftig ved anvendelse af rullelejer med selvstændig smøring.Screw centrifugal pumps are known per se from other side, e.g. for pumping sludge-containing water or particulate-containing fluids, where they are used only at low lift heights. The advantage of the screw centrifugal pumps is primarily that large 25 particles can pass without being pinched. The known screw centrifugal wheel has the disadvantage that the wheel is not hydraulically balanced. During operation, radial forces arise which must be absorbed by the bearings of the shaft. In the usual applications of the screw centrifugal pump, where it is mounted independently, this is not a problem as the bearing can be made sufficiently strong by the use of self-lubricating roller bearings.

Ved en flertrinspumpe af den ovenfor nævnte konstruktion er 35 lejerne imidlertid smurte af pumpemediet, der er et mindre effektivt smøremiddel, hvorfor lejerne i denne pumpe har begrænset evne til at optage radielle kræfter.However, in a multi-stage pump of the above-mentioned construction, the bearings are lubricated by the pumping medium, which is a less effective lubricant, and therefore the bearings in this pump have limited ability to absorb radial forces.

2 DK 95 00096 U32 DK 95 00096 U3

FORKLARING AF FREMBRINGELSENEXPLANATION OF PRODUCTION

Det nye ved frembringelsen er, at skruecentrifugalpumpen har to kanaler. Det vil sige, at der findes to skovle, der forløber symmetrisk og skrueformet på hjulet omtrent som gænger i et konisk gevind.What is new about the production is that the screw centrifugal pump has two channels. That is, there are two blades that extend symmetrically and helically on the wheel approximately as in a conical thread.

Derved opnår man en afbalancering af de hydrauliske kræfter, således at de radielle kræfter på lejerne til akslen reduceres til nul eller i det væsentlige til nul. Således har det ingen betydning, at der anvendes mediesmurte lejer. Ved frembringelsen reduceres pumpens evne til at pumpe partikler, men til langt de fleste anvendelser inden for tømning af tanke er partiklerne så små, at dette ikke influerer på pumpens effektivitet.This results in a balancing of the hydraulic forces, so that the radial forces on the bearings of the shaft are reduced to zero or substantially to zero. Thus, it is of no importance that media-lubricated bearings are used. In production, the pump's ability to pump particles is reduced, but for the vast majority of applications in tank emptying, the particles are so small that this does not affect the pump's efficiency.

Da de radielle kræfter omtrent ophæves ved pumpen ifølge frembringelsen, foretrækkes det, at akslen kun har ét leje ved skruecentrifugalpumpen, jf. krav 2.Since the radial forces are approximately abolished at the pump according to the manufacture, it is preferred that the shaft has only one bearing at the screw centrifugal pump, cf. claim 2.

Endvidere er det muligt som omhandlet i krav 3 at udføre pumpen ifølge frembringelsen med lejet anbragt mellem løbehjulet og centrifugalpumpen. Således friholdes indløbsåbningen til pumpen for strukturer til lejehuset i indløbet.Further, as claimed in claim 3, it is possible to design the pump according to the production with the bearing disposed between the impeller and the centrifugal pump. Thus, the inlet opening of the pump is kept free of structures for the bearing housing in the inlet.

TEGNINGENDRAWINGS

Udførelseseksempler for frembringelsen skal herefter beskrives nærmere under henvisning til tegningen, hvor fig. 1 viser en første udførelsesform for pumpen ifølge frembringelsen, delvis i snit, fig. 2 og 3 viser et løbehjul til skruecentrifugalde- 3 DK 95 00096 U3 len af pumpen ifølge frembringelsen, henholdsvis set fra siden og fra indløbsenden, fig. 4 viser en anden udførelsesform for pumpen, og 5 fig. 5 viser en tredje udførelsesform for pumpen ifølge frembringelsen.Embodiments of the invention will now be described in more detail with reference to the drawing, in which fig. 1 shows a first embodiment of the pump according to the invention, partly in section; FIG. Figures 2 and 3 show a screw centrifugal impeller of the pump according to the invention, seen from the side and from the inlet end, respectively. 4 shows another embodiment of the pump; and FIG. 5 shows a third embodiment of the pump according to the invention.

10 BESKRIVELSE AF UDFØRELSESEKSEMPLER10 DESCRIPTION OF EMBODIMENT EXAMPLES

Som vist på fig. 1 i det første udførelseseksempel har pumpen et indløb med en sugeåbning 1 for en skruecentrifugal-pumpe 3. Denne 3 er med lange bolte 5 sammenbygget med en 15 flertrinscentrifugalpumpe 7. Øverst i centrifugalpumpen 7 kan pumpemediet føres gennem pumpens afgangsåbning 9 gennem et afgangsrør 11. Den aksel 13, som driver pumperne 3, 7, forløber koaksialt med afgangsrøret 11.As shown in FIG. 1 in the first embodiment, the pump has an inlet with a suction opening 1 for a screw centrifugal pump 3. This 3 is longitudinally bolted 5 together with a 15 multi-stage centrifugal pump 7. At the top of the centrifugal pump 7, the pump medium can be passed through the discharge port 9 of the pump through a discharge pipe 11. The shaft 13 which drives the pumps 3, 7 extends coaxially with the discharge pipe 11.

20 I den viste udførelsesform er pumpen forsynet med tre lejer 15, 17 og 19, idet lejerne 17 og 19 fastholdes af delene 21.In the embodiment shown, the pump is provided with three bearings 15, 17 and 19, the bearings 17 and 19 being held by the parts 21.

Huset 23 til skruecentrifugalpumpen 3 er udformet som en 25 keglestub, og løbehjulet 25 er forsynet med to skrueformede skovle 27. Skovlene 27 består af formede pladestykker, som er påsvejst en centralkonus 29.The housing 23 of the screw centrifugal pump 3 is formed as a cone stub and the impeller 25 is provided with two helical blades 27. The blades 27 consist of shaped plate pieces which are welded to a central cone 29.

Andre udførelsesformer for pumpehuset er naturligvis muli-30 ge, f.eks. kan pumpehuset være udformet med en indvendig overflade, der krummer bort fra symmetriaksen.Other embodiments of the pump housing are of course possible, e.g. For example, the pump housing may be formed with an inner surface which curves away from the axis of symmetry.

Ved frembringelsen afbalanceres de radielle kræfter i løbehjulet 25, og man kan derfor som vist på fig. 4 undvære le-35 jet 19. Derved opnår man også en mere fri åbning 1 samtidig med, at centrifugalpumpedelen 3 bliver lidt kortere.In generating, the radial forces in the impeller 25 are balanced, and as shown in FIG. 4 without the le-35 jet 19. This also results in a more free opening 1, at the same time as the centrifugal pump part 3 becomes slightly shorter.

Claims

A pump for high viscous or solid media, and 10 for emptying tanks, in particular ship tanks, and comprising a centrifugal pump fitted at its inlet with a screw centrifugal pump so that the pumps are operably connected to the same shaft, which is new the screw centrifugal pump has two channels. 15

Pump according to claim 1, which is new in that the shaft has only one bearing at the screw centrifugal pump.

Pump according to claim 2, which is new in that the bearing at the screw centrifugal pump is between the impeller and the centrifugal pump.