NO760250L

NO760250L -

Info

Publication number: NO760250L
Application number: NO760250A
Authority: NO
Inventors: H I Sarvanne
Original assignee: Sarlin Ab Oy E
Priority date: 1975-01-28
Filing date: 1976-01-27
Publication date: 1976-07-29
Also published as: FI750218A; DE2602680A1; FR2299538A1; FR2299538B1; DK31976A; CH608569A5; DK139736C; GB1514056A; DK139736B; SE7600799L

Description

Foreliggende oppfinnelse angår en stående sentrifugalpumpe, hvor drivakseleri går gjennom pumpehusets øvre endevegg og er tettet i forhold til denne. The present invention relates to a standing centrifugal pump, where the drive shaft passes through the upper end wall of the pump housing and is sealed in relation to this.

Ved kjente stående sentrifugalpumper er løpehjulet nesten radialt utformet. Ved pumpehusets øvre endevegg er således frembragt en sentral, oppover rettet forhøyning for tetning av drivakselen. Ulempen ved slike tetningsrom er at i dem samles der luft. Dette foregår f.eks. når man starter pumpingen, fordi luften ikke kommer ut av tetningsrommet. På den annen side, hvis væsken som pumpes, inneholder luft, stiger denne luft som er lettere, oppover til tetningsrommeb når pumpen er i drift. F.eks. inneholder avløpsvann eller cellulosémasse betydelige mengder luft. In known standing centrifugal pumps, the impeller is almost radially designed. At the upper end wall of the pump housing, a central, upwards-directed elevation has thus been created for sealing the drive shaft. The disadvantage of such sealing spaces is that air collects in them. This takes place e.g. when you start pumping, because the air does not escape from the sealing space. On the other hand, if the liquid being pumped contains air, this air, which is lighter, rises upwards into the sealing spaceb when the pump is in operation. E.g. wastewater or cellulose pulp contains significant amounts of air.

Når tetningsrommet er helt eller delvis fylt med luft, foregår ikke tetningens kjøling korrekt. Som følge derav kan tetningen brenne i stykker, særlig hvis det dreier seg om hård-metalltetning. When the sealing space is completely or partially filled with air, the cooling of the seal does not take place correctly. As a result, the seal can burn to pieces, especially if it is a hard metal seal.

Formålet med foreliggende oppfinnelse er å avhjedpe nevnte ulempe. Oppfinnelsen er således kjennetegnet ved at pumpens endevegg er slik utformet at dens og drivakselens mellomliggende tetningspunkt befinner seg i samme eller et lavere nivå enn endeveggens øvrige deler. I pumpen ifølge oppfinnelsen er således ikke noe oppadrettet tetningsrom, hvori luften vil kunne samle seg. Den væske som pumpes, er i berøring med tetningen og kjøler denne. I pumpen ifølge oppfinnelsen er løpehjulet utformet mer aksialt enn det har vært gjort i tilsvarende kjente pumper. The purpose of the present invention is to remedy the said disadvantage. The invention is thus characterized by the fact that the end wall of the pump is designed in such a way that the sealing point between it and the drive shaft is at the same or a lower level than the other parts of the end wall. In the pump according to the invention, there is thus no upward sealing space, in which the air will be able to collect. The liquid that is pumped is in contact with the seal and cools it. In the pump according to the invention, the impeller is designed more axially than has been done in similar known pumps.

En annen enkel utførelse av oppfinnelsen er kjennetegnet ved at det i pumpehusets øvre endevegg er en nedadrettet Another simple embodiment of the invention is characterized by the fact that the upper end wall of the pump housing is directed downwards

sentral fordypning, i hvis bunn tetningsstedet befinner seg.central depression, at the bottom of which the sealing point is located.

I en tidligere kjent pumpe er et radialt løpehjul 1, som er festet til den vertikale drivaksel 2. Pumpehusets øvre endevegg 3 er tettet i forhold til drivakselen 2 med tetningen 4. For at tetningen 4 skal passe på plass har man utformet.i ende-veggen 3 en oppad rettet forhøyning 5. Denne forhøyning 5 In a previously known pump, there is a radial impeller 1, which is attached to the vertical drive shaft 2. The upper end wall 3 of the pump housing is sealed in relation to the drive shaft 2 with the seal 4. In order for the seal 4 to fit in place, one has designed.in end- the wall 3 an upwardly directed elevation 5. This elevation 5

som begrenser tetningsrommet, fylles med luft når pumpingen begynner eller når luft skilles ut fra den væske som pumpes. Luftens og vannets grenseflate er betegnet med 6. Luften hindrer en korrekt kjøling av tetningen 4, hvorav kan følge at tetningen brenner i stykker. which limits the sealing space, is filled with air when pumping begins or when air is separated from the liquid being pumped. The interface between the air and the water is denoted by 6. The air prevents a correct cooling of the seal 4, which can result in the seal burning to pieces.

Ifølge oppfinnelsen er løpehjulet 7 mer radialt utformet. Ved pumpehusets øvre endevegg 8 er anordnet en nedad rettet sentral fordypning 9, i hvis bunn tetningsstedet 10 befinner seg. Luften har således ingen mulighet for å samle seg omkring tetningsstedet 10, men strømmer bort med væsken, hvorved tetningen 10 blir feilfritt kjølt. According to the invention, the impeller 7 is more radially designed. At the pump housing's upper end wall 8, a downwards-directed central depression 9 is arranged, at the bottom of which the sealing point 10 is located. The air thus has no opportunity to gather around the sealing location 10, but flows away with the liquid, whereby the sealing 10 is flawlessly cooled.

Claims

1. Vertical centrifugal pump, where the drive shaft (2) passes through the pump housing's outer end wall (8) and is sealed in hold to this, characterized in that said end wall (8) is designed in such a way that the sealing point (10) between it and the drive shaft (2) is at the same or a lower level than the other parts of the end wall.

2. Centrifugal pump according to claim 1, characterized in that in the upper end wall (8) of the pump housing there is a central recess (9) directed downwards, at the bottom of which the sealing point (10) is located.