SE537330C2

SE537330C2 - Pump for pumping fluid and impeller assembly

Info

Publication number: SE537330C2
Application number: SE1350957A
Authority: SE
Inventors: Patrik Andersson
Original assignee: Xylem Ip Man S R L
Priority date: 2013-08-15
Filing date: 2013-08-15
Publication date: 2015-04-07
Also published as: SE1350957A1; WO2015022648A1

Abstract

537 3 Sammandrag Uppfinningen hanfor sig till en pumphjulssammansattning och en pump for pumpning av vatska, innefattande en pumpkammare och ett i namnda pumpkammare roterbart pumphjul (4) som är uppburet i en nedre ande (5) av en axiellt sig strAckande drivaxelenhet (6), vilken nedre ande (5) has drivaxelenheten (6) är emottagen i en cylinderformad urtagning (10) i pumphjulet (4), varvid pumphjulet (4) Or fram och Ater fOrskjutbart i axiell riktning i fOrhAllande till nAmnda drivaxel- enhet (6) mellan en nedre position och en byre position. Vidare innefattar pumpen ett snApplAsningsforband anordnat i granssnittet mellan drivaxelenheten (6) och den cylinderformade urtagningen (10), varvid snApplAsningsforbandet Or inrattat att positionera pumphjulet (4) i den nedre posi- tionen di en palagd kraft som verkar for att forskjuta pumphjulet (4) i riktning bort frAn den nedre positionen är mindre On ett troskelvdrde. The invention relates to a pump wheel assembly and a pump for pumping liquid, comprising a pump chamber and a pump wheel (4) rotatable in said pump chamber which is supported in a lower end (5) of an axially extending drive shaft unit (6), which lower end (5) has the drive shaft unit (6) is received in a cylindrical recess (10) in the impeller (4), the impeller (4) being forwards and rearwardly displaceable in the axial direction in relation to said drive shaft unit (6) between a lower position and a lower position. Furthermore, the pump comprises a snap-fit connection arranged in the interface between the drive shaft unit (6) and the cylindrical recess (10), the snap-fit connection Or arranged to position the impeller (4) in the lower position in a applied force acting to displace the impeller (4). in the direction away from the lower position is less On a threshold value.

Description

537 3 PUMP FOR PUMPNING AV VATSKA SAMT PUMPHJULSSAMMANSATTNING Uppfinningens tekniska omrade Den foreliggande uppfinningen hanfor sig i allmanhet till en pump far pumpning av vatska, och i synnerhet till en pump for pumpning av fororenad vatska innehallande fast material, sasom kloak- eller avloppsvatten, vilket kan innefatta plastmaterial, hygienartiklar, textilier, trasor, etc. FIELD OF THE INVENTION The present invention relates generally to a pump for pumping liquid, and in particular to a pump for pumping contaminated liquid containing solids, such as sewage or waste water. include plastic materials, hygiene items, textiles, rags, etc.

Enligt en farsta aspekt hanfar sig den foreliggande uppfinningen till en pump innefattande en pumpkammare och ett i namnda pumpkammare roterbart pumphjul som är uppburet i en nedre ande av en axiellt sig strackande drivaxelenhet. Drivaxelenhetens nedre ande är emottagen i en cylinderformad urtagning i pumphjulet, varvid pumphjulet Or fram och ater forskjutbart i axiell riktning i forhallande till namnda drivaxelenhet mellan en nedre position och en Ovre position. According to a first aspect, the present invention relates to a pump comprising a pump chamber and an impeller rotatable in said pump chamber which is supported in a lower spirit of an axially extending drive shaft unit. The lower end of the drive shaft unit is received in a cylindrical recess in the impeller, the impeller Or being displaceable back and forth in the axial direction in relation to said drive shaft unit between a lower position and an upper position.

Enligt en andra aspekt hanfor sig den foreliggande uppfinningen till en pumphjulssammansattning for placering i en pumpkammare hos en pump far pumpning av vatska. According to a second aspect, the present invention relates to an impeller assembly for placement in a pump chamber of a pump for pumping liquid.

Uppfinningens bakgrund och teknikens standpunkt I anlaggningar sasom avloppsstationer, septiska tankar, brunnar, etc., hander att fast material eller fororeningar, sasom sockor, bindor, papper, etc., tapper till anlaggningens pump, exempelvis en drankbar pump som Or nedsankt i anlaggningens bassang. Faroreningarna Or ibland far stora for att passera igenom pumpen i de fall pumphjulet och pumphjulssatet är belagna pa ett fast avstand fran varandra. I varsta fall kan stora bitar av det fasta materialet fa pumphjulet att kilas fast och suedes allvar- ligt skada pumpen. Ett dylikt oavsiktligt driftsstopp Or kostsamt, till foljd av dyrt, besvarligt, och oplanerat underhallsarbete. Background of the invention and the state of the art In plants such as sewage stations, septic tanks, wells, etc., solids or contaminants, such as socks, sanitary napkins, paper, etc., are tapped into the plant pump, for example a drinkable pump which is immersed in the plant basin . The hazardous impurities can sometimes be large enough to pass through the pump in cases where the impeller and impeller set are located at a fixed distance from each other. In any case, large pieces of the solid material can cause the impeller to wedge and suede seriously damage the pump. Such an unintentional shutdown is costly, due to expensive, cumbersome, and unplanned maintenance work.

For att bli kvitt det fasta materialet, Or det kant att utrusta centrifugalpumpar med medel far att skara upp det 35 fasta materialet i mindre bitar och darefter fdra bort de 1 537 3 mindre bitarna tillsammans med den pumpade vdtskan. Emellertid dr uppskarningen av det fasta materialet energikrdvande, vilket är negativt i synnerhet eftersom pumpar av denna typ vanligtvis är i drift under ldnga tidsperioder. Ett annat kcnventionellt satt att bli kvitt det fasta material är att anvdnda ett pumphjul som har enbart en skovel, vilken uppvisar en star genomgaende kanal som är kapabel att lata fast material passera. En nackdel med denna typ av pump är att det fasta materialet ofta trasslar in sig runt skovelns/ bladets framkant. Ett tredje forsak att losa problemet med att stora bitar av fast material tapper till pumpen, är att anvdnda ett arrangemang i vilket pumphjulet är anordnat pa ett fast avstand fran pumphjulssdtet, exempelvis 30-40 mm. En star nackdel är dock att pumpen har en mycket begrdnsad effektivitet hela tiden. In order to get rid of the solid material, the edge of equipping centrifugal pumps with means has to cut the solid material into smaller pieces and then remove the smaller pieces together with the pumped liquid. However, the cutting of the solid material is energy consuming, which is negative especially since pumps of this type are usually in operation for long periods of time. Another conventional way to get rid of the solid material is to use an impeller which has only one vane, which has a rigid through-channel which is capable of passing solid material. A disadvantage of this type of pump is that the solid material often entangles itself around the leading edge of the blade / blade. A third attempt to solve the problem of large pieces of solid material leaking into the pump is to use an arrangement in which the impeller is arranged at a fixed distance from the impeller seat, for example 30-40 mm. A major disadvantage, however, is that the pump has a very limited efficiency at all times.

Fran det Europeiska patentet EP 1,899,609 är det 'cant en pump innefattande ett pumphus forsett med ett roterbart pumphjul, som är uppburet av en drivaxel, och ett pumphjulssate. Pumphjulet är rorligt i axiell riktning i forhallande till pumphjulssdtet far att kunna sldppa igenom starre bitar av fast material som annars riskerar att blockera pumpen eller kila fast pumphjulet. Pumphjulet uppvisar en cylinderformad urtagning i vilket drivaxelenhetens nedre dnde dr emottagen, och pumphjulet dr helt fritt forskjutbart mellan en nedre position och en ovre position. Enligt denna losning har pumphjulet ingen vdldefinierad viloposition/grundposition, utan den nedre positionen intas enbart pa grund av pumphjulets egenvikt, vilket gor det svdrt att justera den axiella spalten mellan pumphjulet och pumphjulssdtet till att hamna inom det foredragna intervallet 0,2-0,8 millimeter. Den enda grundposition som talas am i ndmnda skrift dr att pumphjulet kan inta den ovre positionen medelst en fjdderforspdnning som overvinner pumphjulets egenvikt far att underldtta uppstart av pumpen. Dock dr det synnerligen oprecist att justera den axiella spalten di pumphjulet befinner sig i den byre positionen. 2 537 3 Vissa forsalda produkter baserade pa ovannamnda Europeiska patent har nyttjat en skruvfjAder anordnad mellan drivaxelenhetens andyta och en batten has pumphjulets cylinderformade urtagning, for att erhalla en valdefinierad grundposition/nedre position for att medge justering av den axiella spalten pa vederborligt vis. Denna skruvfjader Or relativt kraftig far att erhalla det valdefinierade vilolaget, och skruvfjadern medfor den nackdelen att nar pumphjulet skall forskjutas i axiell riktning i forhallande till drivaxeln sa verkar skruvfjadern med Okande kraft i forhallande till okande farskjutningsavstand, vilket forsvarar for det fasta materialet att passera pumpen. European patent EP 1,899,609 discloses a pump comprising a pump housing provided with a rotatable impeller, which is supported by a drive shaft, and an impeller set. The impeller is movable in the axial direction in relation to the impeller seat so as to be able to slip through rigid pieces of solid material which otherwise risk blocking the pump or wedging the impeller. The impeller has a cylindrical recess in which the lower end of the drive shaft unit is received, and the impeller is completely freely displaceable between a lower position and an upper position. According to this solution, the impeller has no well-defined rest position / basic position, but the lower position is assumed solely due to the impeller weight, which makes it difficult to adjust the axial gap between the impeller and the impeller seat to fall within the preferred range of 0.2-0.8. millimeter. The only basic position mentioned in the above-mentioned document is that the impeller can assume the upper position by means of a spring bias which overcomes the dead weight of the impeller to facilitate the start-up of the pump. However, it is extremely imprecise to adjust the axial gap in which the impeller is in the off position. 2 537 3 Some pre-sold products based on the above-mentioned European patents have used a helical spring arranged between the front surface of the drive shaft unit and a bath having the cylindrical recess of the impeller, in order to obtain a selected basic position / lower position to allow proper adjustment of the axial gap. This coil spring is relatively strong to obtain the selected resting layer, and the coil spring has the disadvantage that when the impeller is to be displaced in the axial direction in relation to the drive shaft, the coil spring acts with increasing force in relation to increasing travel distance, which defends the solid material to pass .

Vidare skall namnas att dylika drankbara pumpar anvands for att pumpa vatska fran bassanger som Or besvarliga att underhalla och pumparna Or ofta i drift under langa tidsperioder, inte sallan upp till 12 timmar per dag eller mer. Darfor Or det ytterst onskvart att tillhandahalla en pump med lang livslangd. Furthermore, it should be mentioned that such drinkable pumps are used to pump liquid from basins which are difficult to maintain and the pumps are often in operation for long periods of time, not the hall up to 12 hours per day or more. Darfor Or it is extremely unfortunate to provide a pump with a long service life.

Kortfattad beskrivning av uppfinningens syften Den foreliggande uppfinningen tar sikte pa att undanraja ovannamnda nackdelar och tillkortakommanden has tidigare kanda pumpar och att tillhandahalla en forbattrad pump. Ett grundlaggande syfte med uppfinningen Or att till- handahalla en forbattrad pump och pumphjulssammansattning av inledningsvis definierad typ, varvid pumphjulet har ett valdefinierat vilolage/nedre position som medfor att justering av den axiella spalten mellan pumphjulet och pumpens suglock later sig goras med star precision. Brief Description of the Objects of the Invention The present invention aims to obviate the above-mentioned disadvantages and shortcomings of prior art pumps and to provide an improved pump. A basic object of the invention is to provide an improved pump and impeller assembly of initially defined type, the impeller having a selectable rest position / lower position which means that adjustment of the axial gap between the impeller and the suction cap of the pump can be done with star precision.

Ett ytterligare syfte med den foreliggande uppfinningen Or att tillhandahalla en pump och pumphjulssammansattning, dar forskjutning av pumphjulet bort fran pumphjulssatet under drift av pumpen, till fejljd av att en axiell kraft palagts, inte motverkas. 3 537 3 Det är dven ett syfte med den foreliggande uppfinningen dr att tillhandahalla en forbattrad pump av den inledningsvis definierade typen, vilken pa ett palitligt sdtt tillater stora bitar fasta material att passera genom pumpen. A further object of the present invention is to provide a pump and impeller assembly where displacement of the impeller away from the impeller set during operation of the pump, in the absence of an axial force being applied, is not counteracted. It is also an object of the present invention to provide an improved pump of the type initially defined, which in a reliable manner allows large pieces of solid material to pass through the pump.

Kortfattad beskrivning av uppfinningens sardrag Enligt uppfinningen uppnas atminstone det grundldggande syftet medelst den inledningsvis definierade pumpen och pumphjulssammansdttningen, som har sdrdragen definierade i de oberoende kraven. Faredragna utforanden av den foreliggande uppfinningen är vidare definierade i de beroende kraven. Brief description of the features of the invention According to the invention, at least the basic object is achieved by means of the initially defined pump and the impeller assembly, which have the features defined in the independent claims. Hazardous embodiments of the present invention are further defined in the dependent claims.

Enligt den foreliggande uppfinningen tillhandahalls en pump av inledningsvis definierad typ, vilken är kdnnetecknad av att pumpen innefattar ett sndpplasningsforband anordnat i grdnssnittet mellan drivaxelenheten och den cylinderformade urtagningen, varvid sndpplasningsforbandet är inrdttat att positionera pumphjulet i den nedre positionen dl en palagd kraft som verkar far att forskjuta pumphjulet i riktning bort fran den nedre positionen dr mindre an ett traskelvarde. According to the present invention, there is provided a pump of the initially defined type, which is characterized in that the pump comprises a snap-fit connection arranged in the interface between the drive shaft unit and the cylindrical recess, the snap-fit connection being arranged to position the impeller in the lower position Displace the impeller in the direction away from the lower position where less than one threshold value.

Saledes är den foreliggande uppfinningen baserad pa insikten att genom att nyttja ett snapplasningsfarband erhalls ett valdefinierat viloldge/grundldge, far anvdndning vid saval drift av pumpen som vid montering av pumpen samt justering av den axiella spalten. Thus, the present invention is based on the insight that by using a snap-fit conveyor belt, a selected resting ground / basic ground is obtained, used in both operation of the pump and in mounting the pump and adjusting the axial gap.

Enligt ett foredraget utforande av den foreliggande uppfinningen, är snapplasningsforbandet inrattat att i axiell led frikoppla pumphjulet dl pumphjulet är belaget pa avstand fran ndmnda nedre position. Detta medfOr att sndpplasningsforbandet inte verkar med nagon kraft i axiell led pa pumphjulet nar detsamma dr forskjutet bort fran viloldget/nedre positionen. According to a preferred embodiment of the present invention, the snap-fit connection is arranged to disengage in the axial direction the impeller and the impeller is coated at a distance from said lower position. This means that the sanding connection does not act with any force in the axial direction on the impeller when the same is displaced away from the resting joint / lower position.

Enligt ett faredraget utforande av den foreliggande 35 uppfinningen, är ett laselement has snapplasningsforbandet 4 537 3 anordnat i en ldselementurtagning anordnad i pumphjulets cylinderformade urtagning, varvid laselement utgOrs av en fjdderring, och ldselementurtagningen utgors av ett spar. Detta medfar att den fareliggande uppfinningen krdver fd delar och att fjdderringen dven kan anvdndas far att sdkra pumphjulet pi drivaxelenheten. According to a hazardous embodiment of the present invention, a laser element has the snap-fit connection 4 537 3 arranged in a lead element recess arranged in the cylindrical recess of the impeller, the laser element being constituted by a spring ring, and the lead element recess being constituted by a groove. This means that the present invention requires four parts and that the spring ring can also be used to secure the impeller on the drive shaft unit.

I ett ytterligare foredraget utfarande har fjdderringen utmed densammas omkrets varierande radie. Detta medfOr att en klenare fjdderring kan anvdndas, vilket ger majlighet att anvdnda ett ldgre troskelvdrde. In a further preferred embodiment, the spring ring has a varying radius along its circumference. This means that a smaller spring ring can be used, which makes it possible to use a lower threshold value.

Enligt ett foredraget utforande av den foreliggande uppfinningen, innefattar drivaxelenheten en drivaxel och en hylsa, vilken hylsa omger och dr losgarbart forbunden med drivaxeln, varvid hylsan utgar del av drivaxelenhetens nedre dnde. Detta medfor att hylsan kan monteras i pumphjulets cylinderformade urtagning under bildande av en pumphjulssammansdttning, varvid pumphjulssammansdttningen kan sdljas som en forbdttringssats till befintliga pumpar med axiellt farskjutbart pumphjul. According to a preferred embodiment of the present invention, the drive shaft unit comprises a drive shaft and a sleeve, which sleeve surrounds and is releasably connected to the drive shaft, the sleeve forming part of the lower end of the drive shaft unit. This means that the sleeve can be mounted in the cylindrical recess of the impeller, forming an impeller assembly, whereby the impeller assembly can be sold as a replacement kit for existing pumps with axially displaceable impeller.

Ytterligare fardelar med och sdrdrag has uppfinningen framgdr av ovriga osjdlvstdndiga krav samt av den faljande, detaljerade beskrivningen av foredragna utforanden. Further components and features of the invention are apparent from other independent claims and from the following detailed description of preferred embodiments.

Kortfattad beskrivning av ritningarna En mer fullstdndig forstdelse av ovanndmnda och andra sdrdrag och fordelar has den foreliggande uppfinningen kommer att framga av den foljande, detaljerade beskrivningen av foredragna utforanden med hdnvisning till de bifogade ritningarna, pd vilka: Fig. 1 är en schematisk genomskuren sidovy av en hydraulenhet has en uppfinningsenlig pump, visande pumphjulet i den nedre positionen, Fig. 2 är en schematisk genomskuren sidovy av en uppfin- ningsenlig pumphjulssammansdttning enligt ett fare- 537 3 draget utforande, dar pumphjulet dr belaget i den nedre positionen, Fig. 3 är en schematisk genomskuren sidovy av den uppfinningsenlig pumphjulssammansattning enligt figur 2, dar pumphjulet är belaget i en position pa avstand fran den nedre positionen, Fig. 4 är en schematisk genomskuren sidovy av drivaxelenheten enligt ett fOrsta utforande, Fig. 5 är en schematisk genomskuren sidovy av drivaxel- enheten enligt ett andra utfOrande, Fig. 6 är en schematisk genomskuren vy ovanifran av drivaxelenheten enligt figur 4, tagen utmed linjen VI-VI, samt en del av pumphjulet, Fig. 7 är en fdrstorad delvy av figur 2, Fig. 8 ar en fOrstorad delvy av figur 2, visande en detalj av snapplasningsfOrbandet enligt ett forsta utfOrande, Fig. 9 ar en mot figur 8 svarande delvy visande en detalj av snapplasningsforbandet enligt ett andra utfor- ande, Fig. 10 ar en fOrstorad delvy av figur 2, visande en annan detalj av snapplasningsforbandet enligt det fOrsta utfOrandet, Fig. 11 ar en mot figur 10 svarande delvy visande detaljen av snapplasningsfOrbandet enligt ett alternativt utfOrande, Fig. 12 ar en schematisk perspektivvy av ett laselement enligt ett fOrsta utfdrande, Fig. 13 är en schematisk genomskuren vy ovanifran av driv- axelenheten och pumphjulet enligt figur 7, tagen utmed linjen A-A, innefattande laselementet enligt figur 12, Fig. 14 ar en schematisk genomskuren vy ovanifran av drivaxelenheten och pumphjulet enligt figur 7, tagen utmed linjen B-B, innefattande laselementet enligt figur 12, 6 537 3 Fig. 15 är en schematisk perspektivvy av ett laselement enligt ett andra utforande, Fig. 16 är en schematisk genomskuren vy ovanifran av drivaxelenheten och pumphjulet enligt figur 7, tagen utmed linjen A-A, innefattande laselementet enligt figur 15, Fig. 17 är en schematisk genomskuren vy ovanifran av drivaxelenheten och pumphjulet enligt figur 7, tagen utmed linjen B-B, innefattande laselementet enligt figur 15, och Fig. 18 är en schematisk perspektivvy ovanifran av ett pumphjulssdte. Brief Description of the Drawings A more complete understanding of the above and other features and advantages of the present invention will become apparent from the following detailed description of preferred embodiments when taken in conjunction with the accompanying drawings, in which: Fig. 1 is a schematic sectional side view of a hydraulic unit has a pump according to the invention, showing the impeller in the lower position, Fig. 2 is a schematic sectional side view of an impeller assembly according to the invention according to a preferred embodiment, where the impeller is coated in the lower position, Fig. 3 is a schematic sectional side view of the impeller assembly according to the invention according to Fig. 2, where the impeller is mounted in a position spaced from the lower position, Fig. 4 is a schematic sectional side view of the drive shaft unit according to a first embodiment, Fig. 5 is a schematic sectional side view of the drive shaft unit according to a second embodiment, Fig. 6 is a schematic diagram Fig. 7 is an enlarged partial view of Figure 2, Fig. 8 is an enlarged partial view of Figure 2, showing a detail of the snap-fit connection according to Figure 2, taken along the line VI-VI, and a part of the impeller. a first embodiment, Fig. 9 is a partial view corresponding to Fig. 8 showing a detail of the snap-fit joint according to a second embodiment, Fig. 10 is an enlarged partial view of Fig. 2, showing another detail of the snap-fit joint according to the first embodiment, Figs. Fig. 11 is a partial view corresponding to Fig. 10 showing the detail of the snap-fit connection according to an alternative embodiment, Fig. 12 is a schematic perspective view of a laser element according to a first embodiment, Fig. 13 is a schematic sectional view from above of the drive shaft unit and the impeller according to Fig. 7. , taken along the line AA, comprising the laser element according to Fig. 12, Fig. 14 is a schematic sectional view from above of the drive shaft unit and the impeller according to Fig. 7, taken along the line BB, in Fig. 15 is a schematic perspective view of a lasing element according to a second embodiment, Fig. 16 is a schematic sectional view from above of the drive shaft unit and the impeller according to Fig. 7, taken along the line AA, including the lasing element according to Figs. Fig. 17 is a schematic sectional view from above of the drive shaft unit and the impeller of Fig. 7, taken along the line BB, including the laser element of Fig. 15, and Fig. 18 is a schematic perspective view from above of a impeller section.

Detaljerad beskrivning av faredragna utfaranden Hanvisning sker inledningsvis till figur 1, vilken visar en del av en uppfinningsenlig pump, narmare bestamt pumpens hydraulenhet, generellt betecknad 1. ovriga delar av pumpen är borttagna far tydlighets skull vid betraktande av figuren, och dessa delar utgors bland annat av en drivenhet och en mellan drivenheten och hydraulenheten 1 belagen tatningsenhet. Den foreliggande uppfinningen hanfor sig till pumpar i allmanhet, men i det foredragna utforandet utgors pumpen av en drdnkbar centrifugalpump, varvid den faljande beskrivningen av uppfinningen nedan kommer att utga fran en dylik pump utan att far den skull begransas ddrtill. Detailed description of hazardous methods Reference is initially made to Figure 1, which shows a part of a pump according to the invention, more specifically the hydraulic unit of the pump, generally designated 1. Other parts of the pump are removed for clarity when looking at the figure, and these parts include of a drive unit and a sealing unit located between the drive unit and the hydraulic unit 1. The present invention relates to pumps in general, but in the preferred embodiment the pump is a submersible centrifugal pump, the following description of the invention below being based on such a pump without being limited thereto.

Hydraulenheten 1 innefattar ett pumphus eller volut 2, som avgransar en pumpkammare 3, ett i namnda pumpkammare 3 roterbart pumphjul 4, som är uppburet i en nedre dnde 5 av en axiellt sig strackande drivaxelenhet, generellt betecknad 6, och ett suglock 7, som uppvisar en centralt belagen inloppsoppning 8 far inkommande vatskeflode. Suglocket 7, dven kant som pumphjulssdtet, är foretrddesvis losgorbart farbundet med pumphuset 2, exempelvis medelst ett flertal bultar, pa ett sadant satt att suglocket 7 inte kan rotera relativt pumphuset 2. Pumphjulet 4 drivs i rotation av 7 537 3 drivaxelenheten 6 di pumpen dr i drift. Vidare innefattar pumphuset 2 en utloppsoppning 9 for utgaende vatskeflode, vilken utlopppsoppning 9 i det visade utforandet Or radiellt riktat. The hydraulic unit 1 comprises a pump housing or volute 2, which delimits a pump chamber 3, a pump wheel 4 rotatable in said pump chamber 3, which is supported in a lower end 5 of an axially extending drive shaft unit, generally designated 6, and a suction cap 7, which has a centrally located inlet opening 8 for incoming water flood. The suction cap 7, also the edge of the impeller seat, is preferably releasably connected to the pump housing 2, for example by means of a plurality of bolts, in such a way that the suction cap 7 can not rotate relative to the pump housing 2. The impeller 4 is driven in rotation by the drive shaft unit 6 in the pump in operation. Furthermore, the pump housing 2 comprises an outlet opening 9 for outgoing liquid flow, which outlet opening 9 in the shown embodiment Or is radially directed.

Centralt for den foreliggande uppfinningen Or att pumphjulet 4 Or fram och ater forskjutbart i axiell riktning i farhallande till namnda drivaxelenhet 6 mellan en nedre position (visad i figur 1) och en ovre position. Di pumphjulet 4 forskjuts fran den nedre positionen, forskjuts pumphjulet 4 Oven i riktning bort fran suglocket 7 i syfte att slappa forbi stora bitar fast material som aterfinns i den pumpade vatskan. Central to the present invention is that the impeller 4 is displaceable back and forth in the axial direction in the direction of travel to said drive shaft unit 6 between a lower position (shown in figure 1) and an upper position. The impeller 4 is displaced from the lower position, the impeller 4 is displaced in the above direction away from the suction cap 7 in order to relax large pieces of solid material found in the pumped liquid.

Hanvisning sker nu i forsta hand till figurerna 2 och 3, vilka visar det uppfinningsenliga pumphjulet 4. I figur 2 Or pumphjulet 4 belaget i den nedre positionen och i figur 3 Or pumphjulet 4 belaget i en position lokaliserad pa avstand fran den nedre positionen. Da pumphjulet 4 Or belaget i den ovre position, som omnamnts ovan, kan pumphjulet 4 ha forskjutits ytterligare i forhallande till drivaxelenheten 6 An den position som visas i figur 3. Pumphjulet 4 innefattar en cylinderformad urtagning 10, varvid den nedre anden 5 hos drivaxelenheten 6 Or emottagen i namnda cylinderformade urtagning 10. Reference is now made primarily to Figures 2 and 3, which show the impeller 4 according to the invention. In Figure 2, the impeller 4 is located in the lower position and in Figure 3, the impeller 4 is located in a position located at a distance from the lower position. Since the impeller 4 is coated in the upper position, as mentioned above, the impeller 4 may have been further displaced in relation to the drive shaft unit 6 at the position shown in Figure 3. The impeller 4 comprises a cylindrical recess 10, the lower end 5 of the drive shaft unit 6 Or received in said cylindrical recess 10.

Hanvisning sker nu Oven till figurerna 4-6. I utfor- ingsexemplet enligt figur 4 innefattar drivaxelenheten 6 en drivaxel 11 och en hylsa 12, hylsan 12 omger och Or losgorbart forbunden med drivaxeln 11. Hylsan 12 utgor suedes del av drivaxelenhetens 6 nedre ande 5. Hylsan 12 Or farbunden med drivaxeln 11 pa lampligt satt, och i det visade utfor- andet Or hylsan 12 forbunden med drivaxeln 11 medelst en kcnventionell verktygskona 13. Drivaxeln 11 Or konformad och verktygskonan 13 pressas pa drivaxeln 11 med hjalp av en bult som dras at, varpa verktygskonan 13 tvingas utat i radiell led och darmed spanner fast hylsan 12 pa drivaxeln 11. Fordelen med detta utfOrande Or att den inbOrdes axiella positionen mellan hylsan 12 och drivaxeln 11 kan justeras 8 537 3 genom att lossa bulten, forskjuta hylsan 12 i axiell led och dterigen dra at bulten. I utforingsexemplet enligt figur 5 utgars drivaxelenheten 6 av en homogen detalj som utgor drivaxelenhetens 6 nedre dnde 5. Male reference is now given to Figures 4-6 above. In the exemplary embodiment according to Figure 4, the drive shaft unit 6 comprises a drive shaft 11 and a sleeve 12, the sleeve 12 surrounds and is releasably connected to the drive shaft 11. The sleeve 12 forms the suedes part of the lower end 5 of the drive shaft unit 6. The sleeve 12 is suitably connected to the drive shaft 11. In the embodiment shown, the sleeve 12 is connected to the drive shaft 11 by means of a conventional tool cone 13. The drive shaft 11 is cone-shaped and the tool cone 13 is pressed onto the drive shaft 11 by means of a bolt which is pulled, whereby the tool cone 13 is forced out radially and thus the sleeve 12 clamps on the drive shaft 11. The advantage of this embodiment is that the axial position of the shaft between the sleeve 12 and the drive shaft 11 can be adjusted by loosening the bolt, displacing the sleeve 12 in the axial direction and again tightening the bolt. In the exemplary embodiment according to Fig. 5, the drive shaft unit 6 is formed by a homogeneous part which constitutes the lower end 5 of the drive shaft unit 6.

Enligt ett ytterligare, icke visat, utforande är hylsan 12 fastskruvad pa dnden av en cylinderformad, ej konisk, drivaxel 11, och detta utforande medfOr justering genom att anordna onskat antal mellanldgg mellan hylsan 12 och drivaxeln 11. Dock skall ndmnas att detta utforande fungerar och upplevs som att drivaxelenhetens 6 nedre dnde 5 utgors av en homogen detalj di densamma dr monterad. According to a further embodiment, not shown, the sleeve 12 is screwed onto the end of a cylindrical, non-conical, drive shaft 11, and this design entails adjustment by arranging the desired number of spacers between the sleeve 12 and the drive shaft 11. However, it should be noted that this design works and it is experienced that the lower end 5 of the drive shaft unit 6 consists of a homogeneous part in which it is mounted.

Drivaxelenheten 6 och pumphjulet 4 är samfdllt roter- bara och i det visade utforandet, se figur 6, innefattar pumpen en medbringare i form av en stay- eller pinne 14, som är beldgen i grdnssnittet mellan drivaxelenhetens 6 nedre dnde 5 och pumphjulets 4 cylinderformade urtagning 10. Pinnen 14 är beldgen i motstdende urtagningar anordnade i mantelytan has drivaxelenhetens 6 nedre dnde 5 respektive i den cylinderformade urtagningens 10 inneryta. Enligt ett alternativt utforande kan ett flertal pinnar 14, eller medbringare, vara fardelade utmed ndmnda grdnssnitt, foretrddesvis ekvidistant fordelade. Medbringaren kan vara fast forbunden med drivaxelenhetens 6 nedre dnde 5. I ett alternativt, ej visat, utforande Or ett splineforband anordnat i ndmnda grdnssnitt. Drivaxelenhetens 6 nedre dnde 5 har i ett foredraget utforande en nedre, tjockare del som i radiell led ligger an mot innerytan has den cylinderformade urtagningen 10, och en byre, smalare del som i radiell led är beldgen pa avstand fran den cylinderformade urtagningens inneryta. Den nedre tjockare delen styr pumphjulet 4 sd att detsamma inte snedstdlls i farhAllande till pumpens rotationsaxel. The drive shaft unit 6 and the impeller 4 are continuously rotatable and in the embodiment shown, see figure 6, the pump comprises a carrier in the form of a stay or pin 14, which is bellows in the interface between the lower end 5 of the drive shaft unit 6 and the cylindrical recess of the impeller 4. The pin 14 is the bellows in opposite recesses arranged in the casing surface having the lower end 5 of the drive shaft unit 6 and in the inner surface of the cylindrical recess 10, respectively. According to an alternative embodiment, a plurality of pins 14, or carriers, may be spaced along said mowers, preferably equidistantly distributed. The carrier can be fixedly connected to the lower end 5 of the drive shaft unit 6. In an alternative, not shown, embodiment Or a spline connection arranged in the said section. In a preferred embodiment, the lower end 5 of the drive shaft unit 6 has a lower, thicker part which in radial direction abuts the inner surface has the cylindrical recess 10, and a larger, narrower part which in radial direction is bellows spaced from the inner surface of the cylindrical recess. The lower thicker part controls the impeller 4 so that the same is not inclined in relation to the axis of rotation of the pump.

I den ovre delen av den cylinderformade urtagningen pumphjulet 4 Or anordnat en ringtdtning 15 som ligger an 35 mot drivaxelenhetens 6 nedre dnde 5, alternativt mot drivaxeln 11, och som forhindrar att den pumpade vdtskan och 9 537 3 fast material kommer in i den cylinderformade urtagningen 10 ovanifran. In the upper part of the cylindrical recess the impeller 4 Or arranged a ring seal 15 which abuts against the lower end 5 of the drive shaft unit 6, alternatively against the drive shaft 11, and which prevents the pumped liquid and solid material from entering the cylindrical recess 10 from above.

Pumphjulet 4 dr ett sa kallat Oppet pumphjul och innefattar ett nay 16 och en Ovre tackskiva 17 och atminstone ett blad 18, aven kand som skovel, som stracker sig i axiell led fran namnda tackskiva 17. Betraktat i radiell led dr bladet 18 foretradesvis spiralformat i motsatt riktning till pumphjulets 4 normala rotationsriktning, dvs. under normal drift av pumpen. Antalet blad 18 och langden pa bladen 18 kan variera mycket, far att passa olika vatskor och applikationer. Den cylinderformade urtagningen 10 dr anordnad i namnda nay 16. Namnda atminstone ett blad 18 är i det visade utfarandet aven forbundet med namnda nay 16, och i det faredragna utfarandet innefattar pumphjulet 4 tva blad 18. The impeller 4 has a so-called open impeller and comprises a nay 16 and an upper notch disc 17 and at least one blade 18, also known as a vane, which extends in the axial direction from the said impeller 17. Viewed in radial direction, the blade 18 is preferably helically shaped in opposite direction to the normal direction of rotation of the impeller 4, i.e. during normal operation of the pump. The number of blades 18 and the length of blades 18 can vary greatly, to suit different watering cans and applications. The cylindrical recess 10 dr arranged in said nay 16. In the embodiment shown, at least one blade 18 is also connected to said nay 16, and in the dangerous embodiment the impeller 4 comprises two blades 18.

Vidare innefattar pumphjulet 4 ett hal 19 i navet 16, vilket hal 19 forbinder den cylinderformade urtagningen 10 med pumpkammaren 3. Ett syfte med namnda hal 19 dr att medge infOrsel av ett lampligt verktyg for att forbinda hylsan 12 med drivaxeln 11. I figur 3 visas en plugg 20 som Or inford i halet 19, i syfte att forhindra att den pumpade vatskan och fast material kommer in i den cylinderformade urtagningen 10 underifran. Furthermore, the impeller 4 comprises a hall 19 in the hub 16, which hall 19 connects the cylindrical recess 10 to the pump chamber 3. An object of said hall 19 is to allow the insertion of a suitable tool for connecting the sleeve 12 to the drive shaft 11. Figure 3 shows a plug 20 which Or is inserted into the tail 19, in order to prevent the pumped liquid and solid material from entering the cylindrical recess 10 from below.

Hanvisning sker nu i forsta hand till figurerna 7-11. Vasentligt for den foreliggande uppfinningen Or att pumpen innefattar ett snapplasningsforband anordnat i granssnittet mellan drivaxelenheten 6 och den cylinderformade urtagningen 10. Snapplasningsfarbandet Or inrattat att positionera pumphjulet 4 i den nedre positionen di en palagd kraft som verkar for att farskjuta pumphjulet 4 i riktning bort fran den nedre positionen Or mindre an ett i forvag bestamt traskelvarde. Male reference is now made primarily to Figures 7-11. It is essential for the present invention that the pump comprises a snap-fit connection arranged in the interface between the drive shaft unit 6 and the cylindrical recess 10. The snap-fit connection Or is arranged to position the impeller 4 in the lower position in a applied force which acts to push the impeller 4 away from it. lower position Or less than one pre-determined threshold value.

Faretradesvis Or snapplasningsfarbandet inrattat att i axiell led frikoppla pumphjulet 4 di pumphjulet 4 Or belaget pa avstand fran namnda nedre position. If the snap-fit conveyor is arranged to disengage in the axial direction the impeller 4 and the impeller 4 is located at a distance from the said lower position.

I de visade utforandena innefattar snapplasningsfor- bandet ett sate 21 anordnat i granssnittet mellan den nedre, 10 537 3 tjockare delen av drivaxelenhetens 6 nedre ande 5 och den ovre, smalare delen av drivaxelenhetens 6 nedre ande 5. Snapplasningsforbandets sate 21 avgransas foretradesvis av en snapplasningsvulst 22. Vidare är ett laselement 23 hos snapplasningsforbandet anordnat i en laselementurtagning 24 anordnad i innerytan has pumphjulets 4 cylinderformade urtagning 10. Foretradesvis utgars laselementet 23 av en fjaderring och laselementurtagningen 24 utgors fOretradesvis av ett runtomgaende spar. In the embodiments shown, the snap-fit connection comprises a sate 21 arranged in the interface between the lower, 5 537 3 thicker part of the lower end 5 of the drive shaft unit 6 and the upper, narrower part of the lower end 5 of the drive shaft unit 6. The snap-fit connection sate 21 is preferably delimited by a snap-fit 22. Furthermore, a laser element 23 of the snap-fitting joint is arranged in a laser element recess 24 arranged in the inner surface of the cylindrical recess 10 of the impeller 4. Preferably, the laser element 23 is formed by a spring ring and the laser element recess 24 is preferably formed by a circumferential groove.

I figurerna 7-8 och 10-11 utgors laselementet 23 av en fjaderring, och laselementurtagningen 24 utgors av ett spar. Fjaderringen 23 är anordnad i spOret 24 och skjuter ut radiellt inat i pumphjulets 4 cylinderformade urtagning 10, varph den nedre, tjockare delen av drivaxelenhetens 6 nedre Onde 5 dr belagen nedanfOr fjaderringen 23. DOrmed forhindras pumphjulet 4 fran att ramla av drivaxelenheten 6 sasom framgar av figurerna 10 och 11. Vidare Or dtminstone en del av fjaderringen 23 i ingrepp med snapplasningsforbandets sate 21 varpa pumphjulet 4 halls kvar i densammas nedre position. Dvs. snapplasningsvulsten 22 Or belagen ovanfOr fjaderringen 23. In Figures 7-8 and 10-11, the laser element 23 is constituted by a spring ring, and the laser element recess 24 is constituted by a groove. The spring ring 23 is arranged in the groove 24 and projects radially inwards into the cylindrical recess 10 of the impeller 4, whereby the lower, thicker part of the lower portion 5 of the drive shaft unit 6 is located below the spring ring 23. This prevents the impeller 4 from falling off the drive shaft unit 6 as Figures 10 and 11. Furthermore, at least a part of the spring ring 23 in engagement with the sate 21 of the snap-fit connection warp the impeller 4 is kept in its lower position. Ie. snap placement bead 22 Or coated above the spring ring 23.

I figur 9 utg5rs laselementet 23 av ett kullas innefattande ett ror 25, en fjader 26 och en kula 27. Roret 25 Or anordnat i ldselementurtagningen 24 och sticker ut radiellt inat i pumphjulets 4 cylinderformade urtagning 10, och forhindrar darmed att pumphjulet 4 ramlar av drivaxelenheten 6 sasom framgar av figur 9. Dvs. den nedre, tjockare delen av drivaxelenhetens 6 nedre ande 5 är belagen nedanfOr rOret 25. Kulan 27 och fjadern 26 Or anordnade i rOret 25, varpd kulan 27 Or fiaderforspand i riktning radiellt indt och Or i ingrepp med sndpplAsningsforbandets sate 21 varph pumphjulet 4 halls kvar i densammas nedre position. Dvs. snapplasningsvulsten 22 Or belagen ovanfor kulan 27. I ett alternativt icke visat utfdrande Or kulan och rOret ersatt av ett avlangt laselement som Or anordnat i laselementurtagningen och som sticker ut radiellt indt i pumphjulets 11 537 3 cylinderformade urtagning, och forhindrar darmed att pumphjulet ramlar av drivaxelenheten. Dvs. den nedre, tjockare delen av drivaxelenhetens 6 nedre dnde 5 är belagen nedanfor det avlanga laselementet. Det avlanga laselementet är likt kulan 27 i figur 9 fjdderforspdnd i riktning radiellt inat och är i ingrepp med sndpplasningsforbandets site 21 varpa pumphjulet 4 halls kvar i densammas nedre position. Den inre dnden av det avlanga laselementet dr foretrddesvis sfdrisk fir att underlatta samverkan med snapplasningsvulsten 22. In Figure 9, the laser element 23 is formed by a ball shaft comprising a tube 25, a spring 26 and a ball 27. The tube 25 is arranged in the lead element recess 24 and projects radially inwards in the cylindrical recess 10 of the impeller 4, thereby preventing the impeller 4 from falling off the drive shaft unit. 6 as shown in Figure 9. Ie. the lower, thicker part of the lower end 5 of the drive shaft unit 6 is coated below the tube 25. The ball 27 and the spring 26 are arranged in the tube 25, warped the ball 27 or the spring bias in the direction radially inward and engaging the sate 21 of the transducer connection. in its lower position. Ie. The snap-fit bead 22 Or coated above the ball 27. In an alternative embodiment not shown Or the ball and tube are replaced by an elongate laser element arranged in the laser element recess and projecting radially into the cylindrical recess of the impeller, thereby preventing the impeller from falling off the impeller. . Ie. the lower, thicker part of the lower end 5 of the drive shaft unit 6 is coated below the elongate laser element. The elongate laser element, like the ball 27 in Figure 9, is spring-biased in the direction radially inward and is in engagement with the site 21 of the sanding-applying joint, whereby the impeller 4 is retained in its lower position. The inner end of the elongate laser element is preferably dangerous to facilitate interaction with the snap-fit bead 22.

I utforingsexemplet enligt figur 10 dr laselementurtag- ningen 24 kilformad med avsmalnande form i riktning radiellt utat. Den kilformade laselementurtagningen 24 har en byre yta 28 som foretradesvis ar horisontell, en undre yta 29 som lutar i farhallande till den Ovre ytan, och en bottenyta som fOrbinder ndmnda Ovre yta 28 och ndmnda undre yta 29. Fjaderringen 23 ar forspand i riktning radiellt utat varpa delar av densamma ligger an mot den byre ytan 28 och den undre ytan 29 hos laselementurtagningen 23, foretradesvis utan att vara i kontakt med bottenytan 30. Pd detta sdtt pressas fjaderringen 23 mot den byre ytan 28 och darmed erhalls en precis positionering av fjaderringen 23 i firhallande till pumphjulet 4. In the embodiment of Figure 10, the laser element recess 24 is wedge-shaped with a tapered shape in the direction radially outward. The wedge-shaped laser element recess 24 has a curved surface 28 which is preferably horizontal, a lower surface 29 which slopes in relation to the upper surface, and a bottom surface which connects the said upper surface 28 and the said lower surface 29. The spring ring 23 is biased in the direction radially outward. warp parts thereof abut against the upper surface 28 and the lower surface 29 of the laser element recess 23, preferably without being in contact with the bottom surface 30. In this way the spring ring 23 is pressed against the upper surface 28 and thus a precise positioning of the spring ring 23 is obtained. in relation to the impeller 4.

I utforingsexemplet enligt figur 11 innefattar laselementurtagningen 24 en Ovre yta som ar horisontell, en undre yta 29 som dr parallell med den ovre ytan 28 och en bottenyta 30 som forbinder ndmnda byre yta 28 och ndmnda undre yta 29. Fjaderringen 23 ar forspand i riktning radiellt utat varpa delar av densamma ligger an mot bottenytan 30, och pa grund av pumphjulets 4 egenvikt ligger fjdderringen 23 dven an mot den ovre ytan 28, och ddrmed erhalls en precis positionering av fjaderringen 23 i farhallande till pumphjulet 4. In the exemplary embodiment according to Figure 11, the laser element recess 24 comprises an upper surface which is horizontal, a lower surface 29 which runs parallel to the upper surface 28 and a bottom surface 30 which connects the said outer surface 28 and the said lower surface 29. The spring ring 23 is biased in the radial direction outwardly warp parts thereof abut against the bottom surface 30, and due to the dead weight of the impeller 4, the spring ring 23 also abuts against the upper surface 28, and thus a precise positioning of the spring ring 23 in relation to the impeller 4 is obtained.

I ett alternativt icke visat utfOrande ligger fjdderringen 23 an mot den byre ytan 28 men dr belagen pa avstdnd fran bottenytan 30, varpa fjaderringen 23 kan tillatas att expandera i riktning radiellt utdt di snappldsningsvulsten 12 537 3 22 passerar fjdderringen 23. Fjaderringen 23 kan i detta utfOrande vara en cirkular fjaderring. In an alternative embodiment not shown, the spring ring 23 abuts the bearing surface 28 but where coated at a distance from the bottom surface 30, the spring ring 23 may be allowed to expand in a radially extended direction in which the snap-filling bead 12 537 3 22 passes the spring ring 23. made to be a circular spring ring.

Foretrddesvis har fjdderringen 23 utmed densammas omkrets varierande radie, och uppvisar exempelvis oval, tri5 angular eller kvadratisk grundform vid betraktande i axiell riktning. Detta medfor att vissa sektioner av fjdderringen 23 an i kontakt med sdtet 21 hos drivaxelenhetens 6 nedre ande 5 och andra sektioner av fjaderringen 23 an i kontakt med laselementurtagningen 24 hos pumphjulets 4 cylinder- formade urtagning 10. Preferably, the spring ring 23 has a varying radius along its circumference, and has, for example, an oval, triangular or square basic shape when viewed in the axial direction. This means that certain sections of the spring ring 23 come into contact with the seat 21 of the lower end 5 of the drive shaft unit 6 and other sections of the spring ring 23 come into contact with the laser element recess 24 of the cylindrical recess 10 of the impeller 4.

Okad forstdelse av fjaderringen 23 erhalls vid betraktande av figurerna 12-17, vilka visar tva exempel pa utformning av fjaderringen 23. I figurerna 12-14 uppvisar fjdderringen 23 oval grundform, med andra ord har fjdder- ringen 23 mindre radie i tva inbOrdes motsatta riktningar (vertikalt i figurerna 13 och 14) och storre radie i tva andra inbordes motsatta riktningar (horisontellt i figurerna 13 och 14). Dar fjdderringen 23 suedes har minst diameter An fjaderringen 23 i kontakt med drivaxelenhetens 6 sate 21, och ddr fjdderringen 23 saledes har storst diameter an fjaderringen 23 i kontakt med pumphjulets 4 ldselementurtagning 24. Sasom framgar av figurerna 13 och 14 kvarhaller fjdderringen 23 aven pinnen 14. I figurerna 15-17 uppvisar fjdderringen 23 fyrkantig grundform, med andra ord har fjaderringen 23 mindre radie i fyra riktningar (diagonalt i figurerna 16 och 17) och storre radie i fyra andra riktningar (horisontellt och vertikalt i figurerna 16 och 17). Dar fjdderringen 23 saledes har minst diameter är fjaderringen 23 i kontakt med drivaxelenhetens 6 sate 21, och dar fjaderringen 23 saledes har storst diameter an fjaderringen 23 i kontakt med pumphjulets 4 laselementurtagning 24. Sasom framgar av figurerna 16 och 17 kvarhaller fjaderringen 23 dven pinnen 14. An increased understanding of the spring ring 23 is obtained when looking at Figures 12-17, which show two examples of the design of the spring ring 23. In Figures 12-14, the spring ring 23 has an oval basic shape, in other words the spring ring 23 has a smaller radius in two opposite directions. (vertically in Figures 13 and 14) and larger radius in two other inboard opposite directions (horizontally in Figures 13 and 14). Where the spring ring 23 is sued has the smallest diameter of the spring ring 23 in contact with the seat 21 of the drive shaft unit 6, and where the spring ring 23 thus has the largest diameter than the spring ring 23 in contact with the lead element socket 24 of the impeller 4. As shown in Figures 13 and 14, the spring ring 23 retains the pin 14 In Figures 15-17, the spring ring 23 has a square basic shape, in other words, the spring ring 23 has a smaller radius in four directions (diagonally in Figures 16 and 17) and a larger radius in four other directions (horizontally and vertically in Figures 16 and 17). Where the spring ring 23 thus has the smallest diameter, the spring ring 23 is in contact with the seat 21 of the drive shaft unit 6, and where the spring ring 23 thus has the largest diameter of the spring ring 23 in contact with the impeller socket 24 of the impeller 4. As shown in Figures 16 and 17, the spring ring 23 retains the pin 14 .

Men korrekt skall fjaderringen 23 uppvisa en mindre radie i dtminstone en riktning och storre radie i atminstone en annan riktning. Da fjaderringen 23 uppvisar oval och 13 537 3 fyrkantig grundform dr tvh mindre radier motsatta, och tvd storre radier motsatta. I utforandet med triangular fjaderring 23 dr en mindre radie motsatt en stOrre radie. But correctly, the spring ring 23 should have a smaller radius in at least one direction and a larger radius in at least one other direction. Since the spring ring 23 has an oval and 13 537 3 square basic shape, there are two smaller radii opposite, and two larger radii opposite. In the design with triangular spring ring 23 there is a smaller radius opposite a larger radius.

Den varierande radien medfdr att fjdderringen 23 kan vara fjdderforspdnd savd1 i sdtet 21 som i laselementurtagningen 24 och ddrmed erhalls en precis placering av pumphjulet 4 i densammas nedre position utan spel i axiell riktning. Samtidigt krdvs relativt liten axiellt palagd kraft for att fa sndppldsningsvulsten 22 att passera fjdderringen 23. The varying radius means that the spring ring 23 can be spring-biased saw1 in the seat 21 as in the laser element recess 24 and thus a precise placement of the impeller 4 in its lower position without play in the axial direction is obtained. At the same time, a relatively small axially applied force is required to cause the sanding bead 22 to pass the spring ring 23.

Om en cirkelformad fjdderring 23 anvdnds kan den inte vara fjdderforspdnd i lhselementurtagningen 24 iochmed att fjdderringen 23 maste ha utrymme att expandera i riktning radiellt utht dl snapplasningsvulsten 22 passerar fjader- ringen 23. If a circular spring ring 23 is used, it cannot be spring biased in the locking element recess 24 and in that the spring ring 23 must have space to expand in the direction radially extending as the snap-fit bead 22 passes the spring ring 23.

Ndr en stor bit fast material tvingar pumphjulet 4 att ldmna densamma nedre position verkar ingen motverkande kraft efter det att snapplasningsforbandet gatt ur sitt ingrepp. Efter det att det fasta materialet passerat intar pumphjulet 4 densamma nedre position pd grund av att det fOrefinns ett hogre hydrauliskt tryck ph ovansidan av pumphjulets 4 tackskiva an pa undersidan av pumphjulet 4, och i de fall pumpen är orienterad upprdtt sasom framgar av figurerna verkar dven pumphjulets 4 egentyngd for att aterfdra pumphjulet 4 till densammas nedre position. Ndr pumphjulet 4 har fOrskjutits fran densammas nedre position befinner sig fjdderringen 23 saledes fortfarande i laselementurtagningen 24, och ndr pumphjulet 4 atervdnder till densammas nedre position positioneras fjdderringen 23 aterigen i drivaxelenhetens 6 sate 21. When a large piece of solid material forces the impeller 4 to leave the same lower position, no counteracting force acts after the snap-fitting joint has come out of its engagement. After the solid material has passed, the impeller 4 assumes the same lower position due to the fact that there is a higher hydraulic pressure on the upper side of the impeller 4 of the impeller 4 on the underside of the impeller 4, and in cases where the pump is oriented upright as shown in the figures, the self-weight of the impeller 4 to return the impeller 4 to its lower position. When the impeller 4 has been displaced from the lower position thereof, the spring ring 23 is thus still in the locking element recess 24, and when the impeller 4 returns to its lower position, the spring ring 23 is again positioned in the seat 21 of the drive shaft unit 6.

Nu hdnvisas till figur 18, vilken visar ett utfdrande av ett suglock 7. Reference is now made to Figure 18, which shows an embodiment of a suction cap 7.

I suglockets 7 Ovre yta och angrdnsande pumpkammarens 3 inlopp 8, dr anordnat atminstone ett spar eller sldppnings35 spar 31. Spdret 31 strdcker sig fran suglockets 7 inlopp 8 mot densammas periferi. Foretradesvis i en spiralform som 14 537 3 sveper utdt i pumphjulets 4 rotationsriktning, dvs. i motsatt riktning till den has bladen 18. Antalet spar 31 och deras form och orientering kan variera start for att passa olika vdtskor och applikationer. Funktionen has spdret 31 är att styra det fasta materialet i den pumpade vatskan utat mot pumphusets 2 periferi. Da det fasta materialet passerar genom pumpen, kommer en del att fastna under pumphjulets 4 blad 18 och sanka pumphjulets rotationshastighet och till och med stoppa densamma. Men sparet 31 bidrar till att hdlla bladen 18 rena, genom att skrapa av det fasta materialet vardera gang bladet 18 passerar detsamma. Om det fasta materialet är far start att passa i spdret 31, mellan pumphjulet 4 och suglocket 7, kommer pumphjulet 4 att forskjutas uppat bort frhn suglocket 7 med hjdlp av det fasta materialet och darigenom tillata det fasta materialet att passera genom pumpen. In the upper surface of the suction cap 7 and the inlet 8 of the adjacent pump chamber 3, there is arranged at least one groove or groove 35 groove 31. The groove 31 extends from the inlet 8 of the suction lid 7 towards the periphery thereof. Preferably in a helical shape which sweeps extensively in the direction of rotation of the impeller 4, i.e. in the opposite direction to the has blades 18. The number of grooves 31 and their shape and orientation can vary starting to suit different shoes and applications. The function of the spreader 31 is to guide the solid material in the pumped liquid towards the periphery of the pump housing 2. As the solid material passes through the pump, a part will get stuck under the blades 18 of the impeller 4 and slow down the rotational speed of the impeller and even stop it. But the groove 31 helps to keep the blades 18 clean, by scraping off the solid material each time the blade 18 passes the same. If the solid material is to start fitting in the spreader 31, between the impeller 4 and the suction cap 7, the impeller 4 will be displaced upwards away from the suction cap 7 by means of the solid material and thereby allow the solid material to pass through the pump.

Formen pd bladets 18 undre kant motsvarar i axiell riktning, formen hos suglockets 7 ovre yta. Det axiella avstdndet mellan namnda undre kant och namnda ovre yta b r vara mindre an 1 mm dd pumphjulet 4 är i den nedre positionen. Faretrddesvis är ndmnda avstdnd mindre an 0,8 mm och allra helst mindre an 0,5 mm. Samtidigt skall namnda avstand vara mer an 0,1 mm och foretrddesvis mer an 0,2 mm. Om pumphjulet 4 och suglocket 7 dr fOr ndra varandra verkar en friktionskraft eller en bromskraft pa pumphjulets 1 blad 18. The shape of the lower edge of the blade 18 corresponds in the axial direction to the shape of the upper surface of the suction cap 7. The axial distance between said lower edge and said upper surface should be less than 1 mm when the impeller 4 is in the lower position. Preferably, said distances are less than 0.8 mm and most preferably less than 0.5 mm. At the same time, said distance should be more than 0.1 mm and preferably more than 0.2 mm. If the impeller 4 and the suction cap 7 pull to change each other, a frictional force or a braking force acts on the blade 18 of the impeller 1.

For att sdkerstdlla att pumpens inlopp 8 inte blir tilltdppt, är suglocket 7 fdretrddesvis fOrsett med medel for att styra det fasta materialet mot spdret 31. Styrmedlet innefattar dtminstone en styrtapp 32 som strdcker sig frdn suglockets 7 byre yta, ndrmare bestdmt frdn den del av den Ovre ytan som är vdnd mot inloppet 8. Styrtappen 32 strdcker sig i allmanhet i radiell riktning has suglocket 7 och är beldgen under pumphjulet 4 och uppvisar en byre yta 33, som strdcker sig frdn en position angrdnsande den innersta delen av pumphjulets 4 blad 18 mot eller till suglockets 7 ovre yta. Narmare bestamt, är den innersta delen av styrtappens 537 3 32 Ovre yta 33 beldgen ungefdr pa samma radiella avstand frdn pumphjulets 4 centrum som den innersta delen av pumphjulets 4 blad 18. Foretrddesvis dndar styrtappens 32 Ovre yta 33 gransande till namnda spars 31 "inlopp". Det axiella avstandet mellan styrtappens 32 byre yta 33 och bladets 18 framkant bar vara mindre an 1 mm, dl pumphjulet 4 dr i den nedre positionen. In order to ensure that the inlet 8 of the pump is not clogged, the suction cap 7 is preferably provided with means for guiding the solid material towards the groove 31. The control means comprises at least one guide pin 32 extending from the outer surface of the suction cap 7, but more specifically therefor The upper surface facing the inlet 8. The guide pin 32 extends generally in the radial direction has the suction cap 7 and is bellows below the impeller 4 and has a curved surface 33 extending from a position adjacent the innermost part of the impeller blade 18 towards or to the upper surface of the suction cap 7. More specifically, the innermost portion of the guide pin 537 3 32 upper surface 33 is bellows approximately at the same radial distance from the center of the impeller 4 as the innermost portion of the impeller 4 blades 18. Preferably, the upper surface 33 of the guide pin 32 adjacent to said recess 31 "inlet" . The axial distance between the upper surface 33 of the guide pin 32 and the leading edge of the blade 18 should be less than 1 mm, dl the impeller 4 dr in the lower position.

Den foreliggande uppfinningen avser dven en pumphjulssammansdttning far placering i en pumpkammare 3. En dylik pumphjulssammansdttning kan sdljas som en forbdttringssats till en pump med axiellt forskjutbart pumphjul enligt tidigare kdnd teknik. Pumphjulssammansattningen innefattar ett pumphjul 4 med en cylinderformad urtagning 10 och en hylsa 12. Hylsa 12 dr emottagen i namnda cylinderformade urtagning 10, varvid hylsan 12 dr anordnad att vara forbunden med den axiellt sig strdckande drivaxel 11. Pumphjulet 4 dr inrdttat att vara fram och ater forskjutbart i axiell riktning i forhallande till ndmnda hylsa 12 mellan en nedre position och en byre position. Vidare är ett snapp- lasningsforband anordnat i grdnssnittet mellan hylsan 12 och den cylinderformade urtagningen 10, varvid snapplasningsfarbandet är inrdttat att positionera pumphjulet 4 i den nedre positionen dl en palagd kraft som verkar far att forskjuta pumphjulet 4 i riktning bort fran den nedre posi- tionen dr mindre an ett troskelvdrde. Ddrtill (Jailer allt som skrivits ovan betrdffande sndpplasningsforbandet, hylsan 12 och pumphjulet 4. I detta sammanhang tillhor saledes hylsan 12 pumphjulssammansdttningen, och ndr pumphjulssammansattningen dr monterad pd drivaxeln 11, tillhor hylsan 12 dven drivaxelenhetens 6 nedre dnde 5. The present invention also relates to a impeller assembly for placement in a pump chamber 3. Such an impeller assembly can be sold as an improvement kit for a pump with axially displaceable impeller according to the prior art. The impeller assembly comprises a impeller 4 having a cylindrical recess 10 and a sleeve 12. Sleeve 12 received in said cylindrical recess 10, the sleeve 12 being arranged to be connected to the axially extending drive shaft 11. The impeller 4 is arranged to be forward and displaceable in the axial direction in relation to the said sleeve 12 between a lower position and an upper position. Furthermore, a snap-fit connection is arranged in the interface between the sleeve 12 and the cylindrical recess 10, the snap-fit connection being arranged to position the impeller 4 in the lower position by a applied force which acts to displace the impeller 4 in the direction away from the lower position. where less than one threshold value. In addition, as described above, the sleeve 12 and the impeller 4. In this context, the sleeve 12 belongs to the impeller assembly, and when the impeller assembly is mounted on the drive shaft 11, the sleeve 12 also belongs to the drive shaft unit.

Tdnkbara modifikationer av uppfinningen Uppfinningen dr ej begrdnsad blott till de ovan beskrivna och pa ritningarna visade utfarandena, vilka enbart 35 har illustrerande och exemplifierande syfte. Denna patent- 1 6 537 3 ans6kning dr avsedd att tacka alla anpassningar och varianter av de foredragna utforandena beskrivna hari, och foljaktligen dr den fOreliggande uppfinningen definierad av ordalydelsen av de bifogade kraven och saledes kan utrust- ningen modifieras pa alla tankbara satt mom ramen for de bifogade kraven. Possible modifications of the invention The invention is not limited only to the methods described above and shown in the drawings, which are for illustrative and exemplary purposes only. This patent application is intended to thank all the adaptations and variants of the preferred embodiments described herein, and consequently the present invention is defined by the wording of the appended claims and thus the equipment may be modified in any conceivable manner within the scope of the invention. the attached requirements.

Det skall aven papekas att all information om/rOrande termer sasom ovanf5r, under, 5vre, nedre, etc., skall tclkas/lasas med utrustningen orienterad i enlighet med figurerna, med ritningarna orienterade pa sadant satt att hanvisningsbeteckningarna kan lasas pa ett korrekt satt. Saledes, indikerar dylika termer enbart inbordes fOrhallanden i de visade utfOrandena, vilka fOrhallande kan andras cm den uppfinningsenliga utrustningen fOrses med en annan konstruktion/design. It should also be noted that all information about / concerning terms such as above, below, lower, lower, etc., shall be interpreted / read with the equipment oriented in accordance with the figures, with the drawings oriented in such a way that the reference numerals can be read correctly. Thus, such terms only indicate conditions embedded in the embodiments shown, which conditions may be different if the inventive equipment is provided with a different construction / design.

Det skall papekas att Oven om det ej Or uttryckligen angivet att sardrag fran ett specifikt utfOrande kan kombineras med sardragen i ett annat utforande, skall detta anses uppenbart cid sa Or mojligt. 17 It should be noted that Although it is not expressly stated that features from a specific design can be combined with features in another design, this should be considered as obvious as possible. 17

Claims

537 3 Patent claims

A pump for pumping liquid, comprising a pump chamber and a pump wheel (4) rotatable in said pump chamber as Pr supported in a lower end (5) of an axially sip stretching drive shaft unit (6), which lower end (5) has the drive shaft unit ( 6) received in a cylindrical recess (10) in the impeller (4), the impeller (4) being forward and rearwardly displaceable in the axial direction relative to said drive shaft unit (6) between a lower position and a Pyre position, drawn by, that the pump further comprises a snap-fit connection arranged in the interface between the drive shaft unit (6) and the cylindrical recess (10), the snap-fit connection being arranged to position the impeller (4) in the lower position with a applied force acting to displace the impeller (4) direction away from the lower position is less than a threshold value.

Pump according to claim 1, used in the snap-fit connection Pr arranged to disengage in the axial direction the impeller (4) when the impeller (4) is mounted at a distance from said lower position.

A pump according to claim 1 or 2, used in the drive shaft unit (6) in the region of its lower end (5) comprises a lower part which abuts radially against an inner surface of the cylindrical recess (10), and a Pyre part which in the radial direction Pr coated at a distance from the inner surface of the cylindrical recess (10), a sate (21) having the snap-fit connection being arranged in the interface between said Pyre part and said lower part.

A pump according to claim 3, used in the sate (21) of the snap-fit connection is delimited by a snap-fit bead (22).

A pump according to any one of claims 1-4, used in a laser element (23) having the snap-fit connection Pr arranged in a laser element recess (24) arranged in the cylindrical recess (10) of the impeller (4).

A pump according to claim 5, used in the ID element of the snap-release connection is provided by a spring ring (23), and the locking element recess (24) is provided by a groove.

A pump according to claim 6, vane in the spring ring (23) along its circumference has varying radius, viewed in axial direction.

A pump according to claim 7, used in the spring ring (23) having an oval, triangular or square basic shape, viewed in the axial direction.

Pump according to claim 5, used in the laser element (23) of the snap release joint, consists of a ball shaft comprising a tube (25), a spring (26) and a ball (27).

A pump according to any one of the preceding claims, comprising the drive shaft unit (6) comprising a drive shaft (11) and a sleeve (12), the sleeve (12) surrounding and releasably connected to the drive shaft (11), the sleeve (12) forming part of the lower end (5) of the drive shaft unit (6).

An impeller assembly for placement in a pump chamber, comprising an impeller (4) having a cylindrical recess (10) and a sleeve (12), said sleeve (12) received in said cylindrical recess (10), the sleeve (12) Or arranged to be connected to an axially extending drive shaft (11), and wherein the impeller (4) is displaceable in the axial direction relative to said sleeve (12) between a lower position and an upper position, characterized in that a The snap-fit connection is arranged in the interface between the sleeve (12) and the cylindrical recess (10), the snap-fit connection being arranged to position the impeller (4) in the lower position dA a applied force acting to displace the impeller (4) away from the lower position is less than a threshold value. a \ 537 3 537 3 537 3 VI