DK146346B - SELF-CUTTING CENTRIFUGAL PUMP - Google Patents
SELF-CUTTING CENTRIFUGAL PUMP Download PDFInfo
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- DK146346B DK146346B DK084477AA DK84477A DK146346B DK 146346 B DK146346 B DK 146346B DK 084477A A DK084477A A DK 084477AA DK 84477 A DK84477 A DK 84477A DK 146346 B DK146346 B DK 146346B
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- pump
- impeller
- dilution
- housing
- channel
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
- F04D1/063—Multi-stage pumps of the vertically split casing type
- F04D1/066—Multi-stage pumps of the vertically split casing type the casing consisting of a plurality of annuli bolted together
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D9/00—Priming; Preventing vapour lock
- F04D9/004—Priming of not self-priming pumps
- F04D9/005—Priming of not self-priming pumps by adducting or recycling liquid
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
i 1463-46in 1463-46
Opfindelsen angår en centrifugalpumpe med automatisk spædning.The invention relates to a centrifugal pump with automatic dilution.
Ved de gængse centrifugalpumper skelnes der mellem pumper med automatisk spædning, f.eks. pumper med kun ét pumpetrin, eller pumper med flere pumpetrin i et fælles pumpehus på den ene side og på den anden side flertrinspumper uden selvtilsugning og opdelt i flere særskilte segmenter.In conventional centrifugal pumps, automatic dilution pumps are distinguished, e.g. pumps with only one pump stage, or pumps with multiple pump stages in a common pump housing on one side and on the other hand multistage pumps without self-suction and divided into several separate segments.
Pumper med automatisk spædning og med et blokformet pumpehus skal fyldes med pumpemedium inden første igangsætning efter tømning.Pumps with automatic dilution and with a block-shaped pump housing must be filled with pump medium before the first start-up after emptying.
Selvtilsugende pumper med kun ét pumpetrin er ikke særlig effektive som sugepumper. Anvendelsen af pumper med flere pumpetrin i et blokformet pumpehus er begrænset på grund af pumpehusets uforanderlige konstruktion, hvis antal pumpetrin ikke uden videre kan øges eller mindskes med det formål at tilpasse pumpens funktion og ydelse til forskellige forhold eller varierende arbejdsbetingelser.Self-suction pumps with only one pump stage are not very effective as suction pumps. The use of pumps with multiple pump stages in a block-shaped pump housing is limited due to the invariable construction of the pump housing, the number of pump steps cannot be increased or decreased for the purpose of adapting the pump's performance and performance to different conditions or varying operating conditions.
Ved forøgelse af pumpetrinnene forbedres pumpens ydelse, især når pumpen arbejder med lille omløbstal. To af motorer med ens effekt drevne pumper, en éttrins-pumpe med automatisk spædning, og en i flere pumpeelementer med hvert sit pumpetrin opdelt pumpe, der arbejder under ens tilsugningsbetingelser, vil have vidt forskellige fortrængningsydelser. Pumpen med flere pumpetrin vil have en større sugehøjde end pumpen med kun ét pumpetrin.Increasing the pump steps improves pump performance, especially when the pump is operating at low flow rates. Two motors powered by similarly powered pumps, a single-stage automatic dilution pump, and a pump divided into several pump elements, each with its own pump stage, operating under the same suction conditions, will have widely different displacement benefits. The pump with multiple pump stages will have a greater suction height than the pump with only one pump stage.
De hidtil kendte flert rinspumper med særskilte segmenter har imidlertid som nævnt den mangel, at de ikke er automatisk tilsugende, så at brugeren før hver igangs-sætning af pumpen manuelt skal spæde denne. Pumper af 2 146346 sidstnævnte type er derfor kun praktisk anvendelige, såfremt de kan fyldes med et under tryk stående pumpe-medium.However, as previously mentioned, several prior art purge pumps with separate segments have the disadvantage that they are not automatically aspirated, so that the user must manually dilute the pump before each commissioning of the pump. Therefore, pumps of the latter type are only practically usable if they can be filled with a pressurized pump medium.
Man vil ofte være interesseret i en alsidig pumpe med god tilsugning og en god pumpeydelse. Opfindelsen angår en pumpe af den i krav l's indledning angivne art og tager sigte på at tilvejebringe en sådan centrifugalpumpe, hvis fortrængningsydelse hurtigt og bekvemt kan øges eller mindskes efter behov ved forøgelse eller reduktion af antallet af pumpetrin. Dette opnås ved det i krav l's kendetegnende del angivne. Herved opnås nemlig, at de enkelte pumpetrin som komplette pumpeelementer er let at sammenføje eller skilles fra hinanden i en eksisterende pumpe med et givet antal særskilte, komplette pumpetrin, der hver især såvel i konstruktiv som i funktionel henseende danner en sluttet enhed. Pumpens ydelse kan således hurtigt øges eller mindskes henholdsvis ved montering af ét eller flere yderligere pumpetrin eller ved fjernelse af et eller flere trin fra søjlen bestående af oven på hinanden stablede pumpeelementer.You will often be interested in a versatile pump with good suction and good pump performance. The invention relates to a pump of the kind set forth in the preamble of claim 1 and is intended to provide such a centrifugal pump, whose displacement performance can be rapidly and conveniently increased or decreased as needed by increasing or decreasing the number of pump steps. This is achieved by the characterizing part of claim 1. In this way, it is achieved that the individual pump steps as complete pump elements are easy to join or separate from each other in an existing pump with a given number of separate, complete pump steps, each of which forms a closed unit both in construction and in functional terms. Thus, the pump performance can be rapidly increased or decreased, respectively, by mounting one or more additional pump steps or by removing one or more steps from the column consisting of superimposed pump elements.
Krav 2 kendetegner en konstruktiv enkel udførelsesform for pumpens tilsugningsanordning, medens kravene 3 og 5 kendetegner konstruktivt enkle og driftssikre midler til sikring af pumpens automatiske spædning.Claim 2 characterizes a constructively simple embodiment of the pump suction device, while claims 3 and 5 characterize simple and reliable means for securing the automatic dilution of the pump.
Endelig opnås ved det i krav 4 angivne en yderligere lettelse ved samlingen af pumpetrinnene i søjlen i den korrekte indbyrdes stilling.Finally, by the addition of claim 4, further relief is obtained in the assembly of the pump steps in the column in the proper mutual position.
I det følgende forklares opfindelsen nærmere ved hjælp af tegningen, hvor fig. 1 er et længdemidtersnit gennem en udførelsesform for pumpen ifølge opfindelsen, 3 U6346 fig. 2 perspektivisk viser oversiden af et endedæksel til spædning af pumpen, fig. 3 perspektivisk et af to dele bestående pumpeskovl-hjul, og fig. 4 perspektivisk et øvre pumpekammer i pumpehuset, med visse dele trukket fra hinanden.In the following, the invention is explained in more detail with reference to the drawing, in which fig. 1 is a longitudinal section through an embodiment of the pump according to the invention; FIG. 2 is a perspective view of the top of an end cap for diluting the pump; FIG. 3 is a perspective view of one of two parts of impeller wheels; and FIG. 4 is a perspective view of an upper pump chamber in the pump housing, with certain parts pulled apart.
Den i fig. 1 viste pumpe har et pumpehus 4, der er afgrænset ved to horisontale planer, et øvre plan AB og et nedre plan GH. Pumpehuset 4 består af tre stift sammenføjede dele, nemlig en mellem planet AB og et plan CD beliggende øvre del 1, en mellem planet CD og et ligeledes horisontalt plan EF beliggende midterdel 2, og en tredje nedre del 3, der er beliggende mellem planerne EF og GH. Pumpehusets øvre del 1 er udformet på traditionel vis og har tre åbninger, nemlig en indsugningsåbning 11, en med denne koaksial afgangsåbning 12 og en i fig. 1 ikke synlig spædeåbning, der er beliggende foran snitplanet i fig. 1. Pumpehuset har en topvæg 15, med hvilken det er fastgjort til en pumpedrivmotor M.The FIG. 1, a pump housing 4 is delimited by two horizontal planes, an upper plane AB and a lower plane GH. The pump housing 4 consists of three rigidly joined parts, namely an upper part 1 between the plane AB and a plane CD, a middle part 2 located between the plane CD and a horizontal plane EF, and a third lower part 3 located between the planes EF and GH. The upper part 1 of the pump housing is designed in a conventional manner and has three openings, namely an inlet opening 11, one with this coaxial outlet opening 12 and one in FIG. 1, which is not visible in a slit aperture located in front of the sectional plane of FIG. 1. The pump housing has a top wall 15 with which it is attached to a pump drive motor M.
I pumpehusets øvre del 1 findes et stort pumpekammer 14.In the upper part 1 of the pump housing is a large pump chamber 14.
Fra indsugningsåbningen 11 udgår en tilgangskanal 16 til tilsugning af pumpemedium, medens der i afgangsåbningen 12 udmunder en afgangskanal 17.From the inlet opening 11, an inlet duct 16 for suction of pump medium is emitted, while in the outlet opening 12 an outlet duct 17 opens.
Pumpehusets beskrevne øvre del 1 kan f.eks. være støbt af metal uden anvendelse af støbekerner.The upper part 1 of the pump housing may e.g. be cast from metal without the use of cast cores.
I pumpehuset findes mindst to i fig. 1 ikke synlige boringer til optagelse af spændebolte til sammenspænding af pumpehusets tre dele 1, 2 og 3 ved hjælp af med boltene samvirkende og i fig. 1 med 35 og 35' betegnede møtrikker.At least two of the pump housings in FIG. 1 are not visible bores for receiving clamping bolts for clamping the three parts 1, 2 and 3 of the pump housing by means of the bolts cooperating and in FIG. 1 with 35 and 35 'nuts.
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Pumpehusets midterdel 2 er opdelt i afsnit og danner i den viste udførelsesform en stabel af fire pumpeelementer, der udgør hvert sit pumpetrin 20, 21, 22 og 23.The central part 2 of the pump housing is divided into sections and in the illustrated embodiment forms a stack of four pump elements, each of which constitutes pump steps 20, 21, 22 and 23.
Hvert element danner et i tværsnit hovedsageligt cirkulært hulrum 24 samt to perifere hulrum 25 og 25', der er adskilt fra hovedhulrummet 24 ved en rundtgående, ubrudt indre væg 26. Hvert element er tæt forbundet med det forudgående og det efterfølgende element ved hjælp af disse centrerende cirkulære feder-not-organer. Elementernes korrekte aksiale placering i forhold til hinanden er sikret ved samvirket mellem tappe 28 og blindboringer henholdsvis på og i de pågældende flader.Each element forms a generally circular cavity 24, as well as two peripheral cavities 25 and 25 ', which are separated from the main cavity 24 by a circumferential unbroken inner wall 26. Each element is closely connected to the preceding and subsequent elements by means thereof. centering circular feder-not bodies. The correct axial position of the elements in relation to each other is ensured by the interaction between pins 28 and blind bores on and in the respective surfaces, respectively.
Således ses i fig. 1 en tap 28, der rager op fra elementet 22fs topflade og samvirker med en blindboring i elementet 23's bundvæg. Den ønskede tæthed mellem de to pumpeelementer er tilvejebragt ved hjælp af en tætningsring 27 i en not 29 i det ene elements endekant-flade.Thus, in FIG. 1 shows a pin 28 which protrudes from the top surface of the element 22f and cooperates with a blind bore in the bottom wall of the element 23. The desired density between the two pump elements is provided by a sealing ring 27 in a groove 29 in the end edge surface of one element.
I hvert element findes passager for spændeboltene.Passages for the clamping bolts are provided in each element.
Ved en foretrukken udførelsesform består pumpehusets midterdel af stablede elementer af et formstof med stor mekanisk styrke og stor slidstyrke. Pumpehusets nedre del 3, der danner pumpens basis, kan være støbt kerne-frit og har fødder 31, en bundvæg 32, et centralt hulrum 33, der danner et ydre tapleje for en pumpeaksel, samt et hovedkammer 34. Pumpehusets nedre del 3 er sammenspændt med husets øvrige dele ved hjælp af spændeboltene og spændemøtrikkerne 35, 35'. Mellem topfladen på pumpehusets del 3 og bundfladen på det nederste element 20 i pumpehusets midterdel 2 findes en tætnings-ring 27' .In a preferred embodiment, the central portion of the pump housing consists of stacked elements of a high mechanical strength and high abrasion resistance. The lower portion 3 of the pump housing forming the base of the pump may be core-free and has feet 31, a bottom wall 32, a central cavity 33 forming an outer tab bearing for a pump shaft, and a main chamber 34. The lower portion 3 of the pump housing is clamped with the other parts of the housing by means of the clamping bolts and tensioning nuts 35, 35 '. Between the top surface of the pump housing part 3 and the bottom surface of the lower element 20 in the middle part 2 of the pump housing is a sealing ring 27 '.
Hovedhulrummene 34, 24 og 14 danner et pumpehovedkammer med hovedsageligt cirkulært tværsnit. Pumpeakselen 5 146346 5 strækker sig centralt gennem pumpehovedkammeret og er ved 38 koaksialt koblet til motoren M's drivaksel. Pumpeakselen 5's nedre endeparti er som nævnt i det foregående lejret i taplejet 33 i pumpehusets bundvæg 32.The head cavities 34, 24 and 14 form a pump head chamber of substantially circular cross section. The pump shaft 5 146346 5 extends centrally through the pump head chamber and at 38 is coaxially coupled to the drive shaft of the motor M. The lower end portion of the pump shaft 5 is as mentioned above in the bearing bed 33 in the bottom wall 32 of the pump housing.
Mellem pumpehusets bunddel 3 og det nederste pumpeelement 20 er anbragt et cirkulært dæksel 200 med en central åbning og indrettet til at lette pumpens selvspæd-ning. Dækslet 200 har et åbningen omgivende randparti med et antal skråt opad og radialt indad rettede render 204, der er udformet på dækslets overside og danner en spids vinkel med pladens hovedplan. Spæderendernes form og rumlige placering fremgår tydeligst af fig. 2. Spæderenderne har retning mod et til det nedre pumpeelement 20 hørende pumpehjul 201's kanal. Spædedækslet 200 er støbt af plast med god mekanisk styrké og kan være fikseret på pumpehusets nedre del 3 under det nederste element 20 ved passende mekaniske midler, f.eks. nitter.Between the bottom part 3 of the pump housing and the lower pump element 20 is arranged a circular cover 200 with a central opening and arranged to facilitate the self-dilution of the pump. The cover 200 has an opening surrounding rim portion with a plurality of obliquely upward and radially inwardly directed grooves 204 formed on the upper side of the cover and forming a pointed angle with the main plane of the plate. The shape and spatial location of the taper ends are most clearly shown in FIG. 2. The taper ends have a direction towards a channel impeller 201 of the lower pump element 20. The dilute cap 200 is molded of good mechanical strength plastic and may be fixed to the lower portion 3 of the pump housing below the lower member 20 by appropriate mechanical means, e.g. rivets.
Hvert pumpeelement danner et trin i flertrinspumpen, og i hvert elements hulrum findes et pumpehjul svarende til hjulet 201 i det nederste element 20. Pumpehjulene er indbyrdes forbundet ved hjælp af tandkoblinger 18 med trapezformede koblingstænder til undgåelse af aksialt og radialt spil. Den således tilvejebragte enhed er fast forbundet med drivmotoren M's drivaksel 5 ved hjælp af to tværstifter eller splitter, en øvre stift 19 og en nedre stift 19', og roteres således tvangsmæssigt sammen med motorakselen 5. Pumpehjulet 201 roterer i nabohulrummet 202, der danner et diffusionskammer bestemt til at omdanne pumpemediets strømningsenergi til tryk.Each pump element forms a step in the multi-stage pump, and in each cavity there is a impeller corresponding to the wheel 201 in the lower element 20. The impellers are interconnected by means of tooth couplings 18 with trapezoidal coupling teeth to avoid axial and radial play. The unit thus provided is firmly connected to the drive shaft 5 of the drive motor M by two transverse pins or splits, an upper pin 19 and a lower pin 19 ', and is thus forcibly rotated together with the motor shaft 5. The impeller 201 rotates in the neighboring cavity 202 forming a diffusion chamber intended to convert the pumping fluid flow energy into pressure.
Hvert pumpehjul med i hvert sit pumpeelement i pumpehuset placerede pumpeskovle kan være tilvejebragt ved 6 146346 sammenføjelse af to skiver d og d*, fig. 3, med ens diameter. De to skivers sammenføjelse i den korrekte centrerede stilling kan f.eks. lettes ved hjælp af centreringsfødder eller -tappe og med disse samvirkende udsparinger, samt ved svejsning eller nitning. Mellem de to skivers mod hinanden vendende indre flader sikres et frit mellemrum som passage for pumpemediet.Each impeller with each impeller located in its own pump element in the pump housing can be provided by joining two discs d and d *, FIG. 3, of equal diameter. The joining of the two discs in the correct centered position may e.g. are facilitated by centering feet or pins and with these cooperative recesses, as well as by welding or riveting. Between the inner surfaces of the two discs facing each other a free space is ensured as passage for the pumping medium.
Hvert element, f.eks. elementet Zl, er således dannet af to koaksiale vægge, der krydses af mindst to kanaler. I det perifere område danner en første åbning en del af tilgangskanalen 16, medens en anden åbning danner en del af en spædekanal. I det centrale område findes en tredje åbning som passage for pumpeakselen.Each element, e.g. the element Z1 is thus formed by two coaxial walls that are crossed by at least two channels. In the peripheral region, a first aperture forms part of the access channel 16, while a second aperture forms part of a dilution channel. In the central area there is a third opening as a passage for the pump shaft.
Et til sammenspændingsorganernes antal svarende antal sideudsparinger tillader pumpeelementernes stabling.One number of side recesses corresponding to the clamping means permits the stacking of the pump elements.
Hvert pumpeelement har supplerende tappe og disse optagende blindboringer til montering af det pågældende element i en fra de øvrige elementer afvigende stilling. Elementerne kan f.eks. være støbt af plast med stor stivhed og mekanisk modstandsdygtighed, f.eks. poly-phenylen-oxid-copolymer kendt under handelsnavnet "Noryl".Each pump element has supplementary pins and these accommodating blind bores for mounting that element in a position different from the other elements. The elements can e.g. be molded of plastic with high rigidity and mechanical resistance, e.g. polyphenylene oxide copolymer known by the trade name "Noryl".
Det øverste element 23 afviger som vist fra de øvrige, idet det ikke har noget hulrum svarende til de andre elementers spædekanalafsnit, men blot en gennembrydning, der tjener som et sæde 233 for en ventil 231. Ventilen 231 er placeret umiddelbart ved spædekanalen og tjener til under spædning at spærre passagen mellem denne og afgangsåbningen 12.The upper element 23 differs as shown from the others in that it has no cavity corresponding to the other channel's section of the duct, but merely a breakthrough which serves as a seat 233 for a valve 231. The valve 231 is located immediately at the dilution channel and serves to while diluting the passage between this and the outlet opening 12.
Ventilen 231 er fremstillet af et elastisk formstof og har som vist i fig. 1 og 4 et cylindrisk ventilhus med en øvre spærredel, hvis diameter er større end den øvrige ventilhusdiameter og større end diameteren af sædet 233 til optagelse af ventilen. Langs med det cylindriske 7 146346 ventilhus’ frembringer findes der i ventilhusets væg aflange udsparinger. Et antal fingre med hver sin frie øvre horisontale kant rager ud gennem hver sin udsparing. De nævnte kanter er beliggende i ens højde, og fingrene er forneden forbundet med cylinderens nedre ende. Ved den i fig. 1 og 4 viste udførelsesform findes tre sådanne fingre, der er indbyrdes vinkel forsat 120°.The valve 231 is made of an elastic resin and has, as shown in FIG. 1 and 4 are a cylindrical valve housing with an upper locking member, the diameter of which is greater than the other valve housing diameter and greater than the diameter of the seat 233 for receiving the valve. Along the cylindrical 7 146346 valve housing, there are elongate recesses in the wall of the valve housing. A number of fingers with each free upper horizontal edge protrude through each recess. The said edges are located at equal height and the fingers are connected at the bottom to the lower end of the cylinder. In the embodiment shown in FIG. 1 and 4 there are three such fingers which are angularly set at 120 °.
Ventilen er justeret og har en fjeder, der modvirker trykdifferencen mellem kanalerne 17 og 25' og er indskudt mellem ventilhovedets nedre rand og den som ventilleje tjenende reces. Fjederkraften er således valgt, at fjederen kun er i ligevægt med trykket på pumpens trykside under selvtilsugningen. Når ventilens øvre flade påvirkes af et højere tryk end dette ligevægts-tryk, sammentrykkes fjederen og forskydes ventilen nedad, hvorved den spærrer for fluidpassagen fra kanalen 17 i retning mod spædekanalafsnittet 25'.The valve is adjusted and has a spring which counteracts the pressure difference between ducts 17 and 25 'and is inserted between the lower edge of the valve head and the recess serving as a valve bearing. The spring force is chosen such that the spring is only in equilibrium with the pressure on the pressure side of the pump during self suction. When the upper surface of the valve is affected by a higher pressure than this equilibrium pressure, the spring is compressed and the valve is displaced downwards, thereby blocking the fluid passage from the duct 17 towards the duct section 25 '.
Ventilen er forankret i sit sæde i det øvre pumpeelement 23 ved elastisk deformation af ventilens formstof-materiale. Ventilhusets nedre cylindriske del med reduceret diameter indskydes sammen med den nævnte husdel omgivende fjeder i ventilsædet, hvorved fingrene svinges indad. Når fingrenes øvre kanter derved passerer ned forbi en spærrekant i sædet, svinges fingrene automatisk udad til en spærrestilling, i hvilken de danner et anslag til fastholdelse af ventilen i korrekt monteringsstilling. Fjederen er da i afspændt hvileposition.The valve is anchored in its seat in the upper pump element 23 by elastic deformation of the valve material material. The reduced cylindrical portion of the valve body of reduced diameter is inserted together with said housing portion surrounding the spring in the valve seat, thereby swinging the fingers inward. As the upper edges of the fingers thereby pass down past a locking edge in the seat, the fingers are automatically swung outwards to a locking position, in which they form a stop for holding the valve in the correct mounting position. The spring is then in a relaxed rest position.
I det følgende forklares pumpens virkemåde. Når pumpen tages i brug for første gang, skal den hensigtsmæssigt spædes. I dette øjemed er det tilstrækkeligt at indsprøjte ca. 1 1/2 liter vand gennem en på tegningen ikke vist spædeåbning. Derefter startes drivmotoren M, så at pumpen begynder at rotere. Den justerede ventil 231 er åben mod spædekanalen, men spærrer mod afgangsåbnin- 8 146346 gen 12. Denne funktionsfase betegnes som recirkulationsfasen, under hvilken pumpen arbejder med et begrænset væskevolumen i et lukket kredsløb, spærrekredsløbet.The operation of the pump is explained below. When commissioning the pump for the first time, it must be appropriately diluted. To this end, it is sufficient to inject approx. 1 1/2 liters of water through a flush opening not shown in the drawing. Then the drive motor M is started so that the pump starts to rotate. The adjusted valve 231 is open to the dilution channel, but locks toward the outlet opening 12. This function phase is referred to as the recirculation phase, during which the pump operates with a limited volume of fluid in a closed circuit, the blocking circuit.
Spædedækslet 200 samler returvæsken og leder den ind i åbningen til det nederste pumpeelement 20's pumpehjul, så at dette hjul til stadighed forsynes med væske. Der tilvejebringes temmelig hurtigt et undertryk i åbningen 206 i det nederste skovlhjul. Fra kanalen 17 strømmer luft-vand-blandingen over i rummet oven for ventilen, idet kun luftblærerne fjernes gennem spædeka-nalen, så at det samlede vandvolumen recirkuleres i pumpen. Under recirkulationen øges undertrykket, der hurtigt når op på værdien svarende til den vandsøjle, der skal tilsuges. Pumpen er nu selvtilsugende, idet trykket over ventilen er større end fjederens holdetryk, så at fjederen sammentrykkes under indvirkning af det store tryk og ventilen vandrer nedad, hvorved passagen mod afgangsåbningen 12 frigives og pumpningen begynder.The dilute cap 200 collects the return fluid and guides it into the opening of the lower impeller pump 20 impeller so that this wheel is continuously supplied with fluid. A negative pressure is provided fairly quickly in the opening 206 of the lower impeller. From the duct 17, the air-water mixture flows into the space above the valve, removing only the air bladders through the dilution duct so that the total volume of water is recirculated in the pump. During recirculation, the underpressure increases rapidly, reaching the value corresponding to the water column to be sucked. The pump is now self-priming, the pressure across the valve being greater than the holding pressure of the spring so that the spring is compressed under the high pressure and the valve migrates downwards, thereby releasing the passage towards the outlet opening 12 and pumping.
Når drivmotoren og dermed pumpemediestrømmen gennem pumpen standses, aftager trykket på ventilen, der da åbnes automatisk. Han kunne frygte, at pumpen nu tømmes på grund af hævertvirkningen. På tilsugningspassa-gens laveste sted findes normalt imidlertid en bundventil, der lukkes og derved forhindrer tømning af pumpen.When the drive motor and thus the pump medium flow through the pump is stopped, the pressure on the valve decreases, which then opens automatically. He could fear that the pump is now being emptied due to the siphon effect. However, at the lowest point of the suction passage, there is usually a bottom valve which closes, thereby preventing the pump from emptying.
Som en yderligre sikkerhedsforanstaltning ved et eventuelt svigt af bundventilen kan der i det øvre pumpeelement 23's nedre væg i nærheden af den justerede ventil findes to åbninger, der eliminerer hæverteffekten.As a further precaution in the event of a failure of the bottom valve, in the lower wall of the upper pump element 23, near the adjusted valve, two openings can be found which eliminate the raising effect.
Herved opnås, at pumpemediet forbliver i pumpen, selv når bundventilen svigter. Pumpen vil således være klar til en ny pumpeydelse uden først at skulle fyldes.This results in the pump medium remaining in the pump even when the bottom valve fails. The pump will thus be ready for a new pump performance without first having to refill.
9 1463469 146346
Pumpen ifølge opfindelsen har følgende fordele:The pump according to the invention has the following advantages:
Den er fuldautomatisk i en hvilken som helst funktionsfase, let at afmontere, rense og genmontere og af flexibel konstruktion, idet antallet af pumpetrin kan varieres.It is fully automatic in any operation phase, easy to disassemble, clean and reassemble and of flexible construction, as the number of pump steps can be varied.
Pumpen ifølge opfindelsen er dog navnlig fordelagtig derved, at den er let at fremstille og dermed billig.However, the pump according to the invention is particularly advantageous in that it is easy to manufacture and thus inexpensive.
Især monteringen af pumpehjulene ved spilfri påkrymp-ning af tænder med trapezformet profil sikrer en stiv konstruktion, der tillader anvendelsen af en ubearbejdet metalstang, f.eks. en stålstang som pumpeaksel.In particular, the mounting of the impeller wheels by toothless crimping of trapezoidal profile teeth ensures a rigid construction which permits the use of an unworked metal rod, e.g. a steel rod as pump shaft.
Ved fremstillingen af pumpen ifølge opfindelsen bortfalder således den hidtil nødvendige nøjagtige finbearbejdning af pumpeakselen, hvilket er bekosteligt og tager lang tid. Anbringelsen af pumpehjulene på akselen er økonomisk og medfører en robust konstruktion.Thus, in the manufacture of the pump according to the invention, the precise machining of the pump shaft required so far lapses, which is expensive and takes a long time. The placement of the impeller wheels on the shaft is economical and results in a robust construction.
Pumpeelementerne kan fremstilles og formes i store serier ved støbning. Pumpen ifølge opfindelsen er meget robust og har lang levetid, og dens mekaniske dele kræver ikke nogen vedligeholdelse. Motorlejerne kan være permanent forsynet med fedt, og pumpen går ikke fast.The pump elements can be manufactured and formed in large series by casting. The pump according to the invention is very robust and has a long service life and its mechanical parts do not require any maintenance. The motor bearings may be permanently greased and the pump will not lock.
Pumpens brug er meget enkel, idet pumpen ikke løber tør for pumpemedium. En enkelt første spædning er tilstrækkelig til, at pumpen kan startes på et hvilket som helst tidspunkt.The use of the pump is very simple as the pump does not run out of pump medium. A single initial dilution is sufficient to allow the pump to be started at any time.
Claims (4)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7605510 | 1976-02-27 | ||
| FR7605510A FR2342416A1 (en) | 1976-02-27 | 1976-02-27 | SELF-PRIMING MULTICELLULAR CENTRIFUGAL PUMP |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK84477A DK84477A (en) | 1977-08-28 |
| DK146346B true DK146346B (en) | 1983-09-12 |
| DK146346C DK146346C (en) | 1984-02-27 |
Family
ID=9169685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK84477A DK146346C (en) | 1976-02-27 | 1977-02-25 | SELF-CUTTING CENTRIFUGAL PUMP |
Country Status (10)
| Country | Link |
|---|---|
| BE (1) | BE851808A (en) |
| CH (1) | CH612476A5 (en) |
| DE (1) | DE2707776C2 (en) |
| DK (1) | DK146346C (en) |
| ES (1) | ES456284A1 (en) |
| FR (1) | FR2342416A1 (en) |
| GB (1) | GB1537221A (en) |
| IT (1) | IT1076587B (en) |
| LU (1) | LU76831A1 (en) |
| NL (1) | NL180950C (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2436898A1 (en) * | 1978-09-22 | 1980-04-18 | Materiel Telephonique | AMBIVALENT CENTRIFUGAL PUMP |
| FR2484562A1 (en) * | 1980-06-13 | 1981-12-18 | Guinard Pompes | Multi-stage pump with plastics outer casing - is mounted on pedestal with shaft overhanging at either end |
| JPS6213794A (en) * | 1985-07-10 | 1987-01-22 | Iwaki:Kk | Self-priming pump |
| HU195286B (en) * | 1986-02-03 | 1988-04-28 | Femtechnika Szivattyu Es Anyag | In-line formation of pump case for self-priming rotary pumps |
| DE3816280C2 (en) * | 1988-05-12 | 1997-03-20 | Klein Schanzlin & Becker Ag | Housing part for centrifugal pumps |
| DE3818651A1 (en) * | 1988-06-01 | 1989-12-07 | Klein Schanzlin & Becker Ag | HOUSING INLINE DESIGN |
| ES2115486B1 (en) * | 1994-12-20 | 1999-02-16 | Bogemar Sl | MULTICELLULAR CENTRIFUGAL ELECTRIC PUMP. |
| FR2776342B1 (en) | 1998-03-18 | 2001-04-20 | Sarl Cg Promo Star | CENTRIFUGAL PUMP WITH AUTOMATIC PRIMING |
| DE10029610C1 (en) * | 2000-06-15 | 2001-12-13 | Grundfos As | Circulation pump drive shaft is fitted with counter-bearing ring at interface between 2 different shaft sections via plastic deformation |
| ITPD20010013A1 (en) * | 2001-01-18 | 2002-07-18 | Dab Pumps Spa | FACILITATED SELF-PRIMING CENTRIFUGAL PUMP STRUCTURE. |
| US6684946B2 (en) * | 2002-04-12 | 2004-02-03 | Baker Hughes Incorporated | Gas-lock re-prime device for submersible pumps and related methods |
| DE10239997A1 (en) * | 2002-08-27 | 2004-03-04 | Gardena Manufacturing Gmbh | Electromagnetic pump has multiple turbine stages with output of last stage connected to discharge chamber of first stage |
| EP2505842B1 (en) | 2011-03-29 | 2019-12-25 | Grundfos Management a/s | Multi stage centrifugal pump system |
| CN105756946B (en) * | 2014-12-19 | 2019-05-31 | 格兰富控股联合股份公司 | A kind of self priming pump |
| US11268516B2 (en) * | 2018-11-19 | 2022-03-08 | Baker Hughes Holdings Llc | Gas-lock re-prime shaft passage in submersible well pump and method of re-priming the pump |
| CN117823415B (en) * | 2024-03-04 | 2024-05-03 | 山东华立供水设备有限公司 | Multistage centrifugal pump |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE462232C (en) * | 1928-07-06 | Robert Pithan | Water ring pump for venting the suction chamber of centrifugal pumps | |
| FR2044994A5 (en) * | 1969-05-29 | 1971-02-26 | Guinard Pompes |
-
1976
- 1976-02-27 FR FR7605510A patent/FR2342416A1/en active Granted
-
1977
- 1977-01-12 NL NLAANVRAGE7700246,A patent/NL180950C/en not_active IP Right Cessation
- 1977-02-14 IT IT20244/77A patent/IT1076587B/en active
- 1977-02-23 DE DE2707776A patent/DE2707776C2/en not_active Expired
- 1977-02-24 LU LU76831A patent/LU76831A1/xx unknown
- 1977-02-25 DK DK84477A patent/DK146346C/en not_active IP Right Cessation
- 1977-02-25 BE BE175238A patent/BE851808A/en not_active IP Right Cessation
- 1977-02-25 CH CH242277A patent/CH612476A5/en not_active IP Right Cessation
- 1977-02-25 ES ES456284A patent/ES456284A1/en not_active Expired
- 1977-02-25 GB GB8186/77A patent/GB1537221A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1537221A (en) | 1978-12-29 |
| IT1076587B (en) | 1985-04-27 |
| NL180950B (en) | 1986-12-16 |
| ES456284A1 (en) | 1978-01-16 |
| FR2342416B1 (en) | 1980-04-30 |
| LU76831A1 (en) | 1977-07-11 |
| BE851808A (en) | 1977-06-16 |
| DK146346C (en) | 1984-02-27 |
| FR2342416A1 (en) | 1977-09-23 |
| NL7700246A (en) | 1977-08-30 |
| DE2707776C2 (en) | 1986-04-24 |
| NL180950C (en) | 1987-05-18 |
| DE2707776A1 (en) | 1977-09-01 |
| DK84477A (en) | 1977-08-28 |
| CH612476A5 (en) | 1979-07-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PBP | Patent lapsed |