EP0334189A2 - Flexible rotor for self priming pumps - Google Patents

Flexible rotor for self priming pumps Download PDF

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Publication number
EP0334189A2
EP0334189A2 EP89104622A EP89104622A EP0334189A2 EP 0334189 A2 EP0334189 A2 EP 0334189A2 EP 89104622 A EP89104622 A EP 89104622A EP 89104622 A EP89104622 A EP 89104622A EP 0334189 A2 EP0334189 A2 EP 0334189A2
Authority
EP
European Patent Office
Prior art keywords
rotor
shaft
flexible
self
pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89104622A
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German (de)
French (fr)
Other versions
EP0334189A3 (en
Inventor
Bruno Wolhfarth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BRUNO WOLHFARTH Srl
Original Assignee
BRUNO WOLHFARTH Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BRUNO WOLHFARTH Srl filed Critical BRUNO WOLHFARTH Srl
Publication of EP0334189A2 publication Critical patent/EP0334189A2/en
Publication of EP0334189A3 publication Critical patent/EP0334189A3/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C5/00—Rotary-piston machines or pumps with the working-chamber walls at least partly resiliently deformable

Definitions

  • the present invention relates to flexible rotors for self-priming pumps for liquid and pasty products.
  • a metal bushing is incorporated whose cross section and configuration correspond to those of the end of the shaft.
  • the sleeve is fixed in the bore of the rotor during the stamping of the body consisting of the hub and the radial fins.
  • the external surface of the nozzle is coated with a special glue or putty.
  • the presence of the metal sleeve does not allow the rotor to be used in a corrosive acid medium. In such cases, you are forced to use a titanium socket, which significantly increases the cost rotor.
  • the object of the present invention is to produce by stamping a rotor provided with flexible fins for self-priming pumps for liquid or pasty products and, while eliminating the drawbacks of known rotors and simplifying its construction, it allows safe coupling with the shaft. of the pump and which can be used in all sectors of industry, such as the chemical, pharmaceutical, cosmetic, food, wine, spirits, carbonated drinks and other industries, as well as those dealing with corrosive acids.
  • the objective sought according to the present invention is achieved by means of a rotor of flexible material comprising, as integral parts, means for the rotary coupling of the predetermined end of the drive shaft of the pump, which means are obtained by simul taneous stamping of the hub and the radial fins.
  • said means consist of a diametrical rib or wall passing through the bore of the hub and being able to engage in a corresponding groove at the end of the pump shaft .
  • the rotor made of elastomeric or similar material is free of any added element (bushing), does not risk becoming coupled with the shaft as a result of the take-off of an element, being in one piece, and finally, such a rotor can be used in all fields of application, where metal parts are undesirable.
  • the rotor according to the invention is economical, with a long service life and with practically unlimited applications.
  • the electric drive motor is designated by M and by P the self-priming pump (section view), the shaft A of which is driven in rotation by the motor by means a seal T.
  • the flexible rotor according to the invention designated by G.
  • the end of the shaft A has a diametrical groove K for engaging in rotation with a corresponding element which has the rotor and which is illustrated in more detail in FIGS. 4 and 5.
  • Said rotor comprises an annular body C provided externally with flexible radial fins R and, according to the invention, a diametrical wall or rib D obtained by simultaneous stamping with the body C and the fins R.
  • the stamping operation is a single operation and and the material used is of the elastomeric type or similar.
  • Said rib D constitutes an element of the rotor intended to be inserted inside the groove K of the shaft A to produce a rotary coupling sure of the parties involved.
  • the chosen solution must not weaken the section of the end of the shaft and / or the rotor and be detrimental to, the service life or the specific conditions of operation of the pump.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Rotary Pumps (AREA)
  • Reciprocating Pumps (AREA)

Abstract

The rotor (G) consists of a circular body (C) which has on its circumference (G) flexible radial paddles (R). Through the centre of the rotor is a hole (F) in which there is a dividing web (D). The rotor is pressure moulded in one operation in an elastomer material, and is housed ina pump housing (P). The rotor (G) is driven by a motor (M) via a coupling (T) and a shaft (A). The end of the shaft is slotted (K) so that, when inserted into the hole (F) in the rotor, the web (D) engages in the slot (K), thus enabling the rotor to be driven.

Description

La présente invention se rapporte aux rotors flexibles pour pompes auto-­amorçantes pour produits liquides et pâteux.The present invention relates to flexible rotors for self-priming pumps for liquid and pasty products.

On connait déjà des rotors flexibles utilisés dans les pompes auto-amor­cantes constitués d'un corps annulaire muni d'ailettes extérieures radiales et flexibles. Ils sont obtenus par une opération d'estampage à partir de matériaux élastomériques, tels que les caoutchoucs silicone, néoprène (Cr), nitrile (NBR) ou les caoutchoucs connus sur le marché sous le nom de DUTRAL (EPT).There are already known flexible rotors used in self-priming pumps consisting of an annular body provided with radial and flexible external fins. They are obtained by a stamping operation from elastomeric materials, such as silicone rubbers, neoprene (Cr), nitrile (NBR) or rubbers known on the market under the name of DUTRAL (EPT).

Pour pouvoir réaliser l'accouplement en rotation de l'extrémité de l'arbre de la pompe et du rotor, on incorpore une douille métallique dont la sec­tion et la configuration correspondent à celles de l'extrémité de l'arbre. La douille est fixée dans le perçage du rotor au cours de l'estampage du corps constitué du moyeu et des ailettes radiales. La présence de la douille intérieure, normalement en acier inoxydable, entraine évidem­ment une augmentation du coût du rotor.In order to be able to achieve rotational coupling of the end of the pump shaft and the rotor, a metal bushing is incorporated whose cross section and configuration correspond to those of the end of the shaft. The sleeve is fixed in the bore of the rotor during the stamping of the body consisting of the hub and the radial fins. The presence of the inner sleeve, normally made of stainless steel, obviously leads to an increase in the cost of the rotor.

En outre, pour consolider l'ancrage de la douille dans le moyeu du rotor, avant l'assemblage du matériau élastomérique ou analogue, on enduit la surface externe de ladouille avec une colle spéciale ou un mastic.In addition, to consolidate the anchoring of the sleeve in the hub of the rotor, before assembly of the elastomeric material or the like, the external surface of the nozzle is coated with a special glue or putty.

Toutefois, quel que soit le soin qu'on apporte dans le choix et l'endui­sage de la colle et dans le procédé d'estampage, on constate en pratique qu'après un certain usage, par suite des sollicitations en torsion répétées subies par l'arbre, la douille tend à se décoller, ce qui rend le rotor inu­tilisable. Dans les cas où le rotor est exposé au contact avec des liquides particuliers, par exemple chimiques, le détachement de la douillle est plus fréquent.However, whatever care is taken in the choice and coating of the adhesive and in the stamping process, it is found in practice that after a certain use, as a result of repeated torsional stresses undergone by the 'shaft, the sleeve tends to come off, making the rotor unusable. In cases where the rotor is exposed to contact with particular liquids, for example chemical, the detachment of the sleeve is more frequent.

En outre, la présence de la douille métallique ne permet pas d'utiliser le rotor en milieu acide corrosif. Dans de tels cas, on est contraint d'avoir recours à une douille en titane, ce qui renchérit notablement le coût du rotor.In addition, the presence of the metal sleeve does not allow the rotor to be used in a corrosive acid medium. In such cases, you are forced to use a titanium socket, which significantly increases the cost rotor.

D'autre part, on sait que les rotors munis de douille métallique ne sont pas utilisés dans les industries où tout contact du produit traité avec du métal est exclu.On the other hand, it is known that the rotors provided with metal bushing are not used in industries where any contact of the treated product with metal is excluded.

La présente invention a pour objet de réaliser par estampage un rotor muni des ailettes flexibles pour pompes auto-amorçantes pour produits liquides ou pâteux et, tout en éliminant les inconvénients des rotors connus et simplifiant sa construction, elle permet un accouplement sûr avec l'arbre de la pompe et qui soit utilisable dans tous les secteurs de l'industrie, telle que l'industrie chimique, pharmaceutique, cosmétique, alimentaire, oenologique, des spiritueux, des boissons gazeuses et autres, ainsi que celles traitant des acides corrosifs.The object of the present invention is to produce by stamping a rotor provided with flexible fins for self-priming pumps for liquid or pasty products and, while eliminating the drawbacks of known rotors and simplifying its construction, it allows safe coupling with the shaft. of the pump and which can be used in all sectors of industry, such as the chemical, pharmaceutical, cosmetic, food, wine, spirits, carbonated drinks and other industries, as well as those dealing with corrosive acids.

L'objectif recherché selon la présente invention est atteint au moyen d'un rotor en matériau flexible comprenant en tant que parties intégrantes des moyens pour l'accouplement rotatif de l'extrémité prédéterminée de l'arbre d' entrainement de la pompe, lesquels moyens sont obtenus par estampage simul tané du moyeu et des ailettes radiales.The objective sought according to the present invention is achieved by means of a rotor of flexible material comprising, as integral parts, means for the rotary coupling of the predetermined end of the drive shaft of the pump, which means are obtained by simul taneous stamping of the hub and the radial fins.

Selon une forme avantageuse et économique de réalisation du rotor, lesdits moyens sont constitués d'une nervure ou paroi diamétrale traversant le per­çage du moyeu et étant en mesure de s'engager dans une gorge correspondante de l'extrémité de l'arbre de la pompe.According to an advantageous and economical embodiment of the rotor, said means consist of a diametrical rib or wall passing through the bore of the hub and being able to engage in a corresponding groove at the end of the pump shaft .

Selon une telle réalisation, le rotor en matériau élastomère ou analogue est exempt d'élément rapporté (douille), ne risque pas de se dèsaccoupler avec l'arbre par suite du décollage d'un élément, étant d'une seule pièce, et, finalement, un tel rotor peut être utilisé dans tous les domaines d'applications, où les pièces métalliques sont indésirables.According to such an embodiment, the rotor made of elastomeric or similar material is free of any added element (bushing), does not risk becoming coupled with the shaft as a result of the take-off of an element, being in one piece, and finally, such a rotor can be used in all fields of application, where metal parts are undesirable.

En conclusion, le rotor selon l'invention est économique, de longue durée de service et d'applications pratiquement illimitées.In conclusion, the rotor according to the invention is economical, with a long service life and with practically unlimited applications.

D'autres avantages et caractéristiques de l'invention apparaitront à la lumière de la description qui suit illustrée par les dessins d'une forme de réalisation préférentielle du rotor présentée à titre d'exemple non limi­tatif. Sur lesdits dessins:

  • la figure 1 présente en vue latérale une électro-pompe en coupe à l'en­droit de l'extrémité de l'arbre tournant accouplé au rotor,
  • la figure 2 est une vue frontale de l'électro-pompe selon la figure 1,
  • la figure 3 montre, à l'échelle agrandie, l'extrémité de l'arbre tournant destinée à entrainer en rotation le rotor selon l'invention,
  • la figure 4 montre en coupe axiale le rotor selon l'invention destiné à être accouplé avec l'extrémité de l'arbre selon la figure 3, et
  • la figure 5 montre une vue de face du rotor de la figure 4.
Other advantages and characteristics of the invention will become apparent from the light of the following description illustrated by the drawings of a preferred embodiment of the rotor presented by way of non-limiting example. On the said drawings:
  • FIG. 1 shows in side view an electro-pump in section at the end of the rotating shaft coupled to the rotor,
  • FIG. 2 is a front view of the electric pump according to FIG. 1,
  • FIG. 3 shows, on an enlarged scale, the end of the rotating shaft intended to drive the rotor according to the invention in rotation,
  • FIG. 4 shows in axial section the rotor according to the invention intended to be coupled with the end of the shaft according to FIG. 3, and
  • FIG. 5 shows a front view of the rotor of FIG. 4.

Par référence à l'électro-pompe de la figure 1, le moteur électrique d'entrainement est désigné par M et par P la pompe auto-amorçante (vue en coupe) dont l'arbre A est entrainé en rotation par le moteur au moyen d'un joint T. A l'extrémité de l'arbre A est monté le rotor flexible selon l'invention, désigné par G.With reference to the electro-pump of FIG. 1, the electric drive motor is designated by M and by P the self-priming pump (section view), the shaft A of which is driven in rotation by the motor by means a seal T. At the end of the shaft A is mounted the flexible rotor according to the invention, designated by G.

On voit sur la figure 2, entre autre, le raccord d'entrainement E et la sortie U de la pompe.We see in Figure 2, among other things, the drive fitting E and the outlet U of the pump.

Comme indiqué plus en détail à la figure 3, l'extrémité de l'arbre A pré­sente une gorge diamétrale K pour s'engager en rotation avec un élément correspondant que présente le rotor et qui est illustré plus en détail aux figures 4 et 5.As indicated in more detail in FIG. 3, the end of the shaft A has a diametrical groove K for engaging in rotation with a corresponding element which has the rotor and which is illustrated in more detail in FIGS. 4 and 5.

Ledit rotor comprend un corps annulaire C pourvu extérieurement des ailettes radiales flexibles R et, selon l'invention, une paroi ou nervure diamétrale D obtenue par estampage simultané avec le corps C et les ailettes R. Ainsi, l'opération d'estampage est une opération unique et et le ma­tériau utilisé est du type élastomérique ou similaire.Said rotor comprises an annular body C provided externally with flexible radial fins R and, according to the invention, a diametrical wall or rib D obtained by simultaneous stamping with the body C and the fins R. Thus, the stamping operation is a single operation and and the material used is of the elastomeric type or similar.

Ladite nervure D constitue un élément du rotor destiné à s' insérer à in­térieur de la gorge K de l'arbre A pour réaliser un accouplement rotatif sûr des parties concernées.Said rib D constitutes an element of the rotor intended to be inserted inside the groove K of the shaft A to produce a rotary coupling sure of the parties involved.

Il est clair, que les dimensions de la gorge K et de la nervure D doivent permettre à l'extrémité de l'arbre et à la nervure de résister aux solli­citations répétées transmises par l'arbre A.It is clear that the dimensions of the groove K and the rib D must allow the end of the shaft and the rib to withstand the repeated stresses transmitted by the shaft A.

Il résulte des essais de laboratoire que les meilleurs résultats du point de vue de la résistance et de la durée sont obtenus avec une nervure D de longueur égale ou peu inférieure à celle du perçage F du rotor et de l'épaisseur s substantiellement égale à l'épaisseur S du corps annulaire C. La forme de réalisation de la partie du rotor destinée à s'engager avec l'arbre peut varier selon les exigeances pratiques.It follows from laboratory tests that the best results from the point of view of resistance and duration are obtained with a rib D of length equal to or slightly less than that of the bore F of the rotor and of the thickness s substantially equal to l thickness S of the annular body C. The embodiment of the part of the rotor intended to engage with the shaft may vary according to practical requirements.

Ainsi, par exemple, à la place d'une nervure diamétrale, on peut prévoir deux nervures en croix ou encore trois nervures radiales disposées à 120° et, de façon correspondante, l'extrémité de l'arbre présenterait des ca­vités ou des gorges en croix ou disposées à 120°.Thus, for example, instead of a diametrical rib, one can provide two cross ribs or three radial ribs arranged at 120 ° and, correspondingly, the end of the shaft would have cavities or grooves in cross or arranged at 120 °.

Dans aucun cas, la solution choisie ne doit permettre d'affaiblir le sec­tion de l'extrémité de l'arbre et/ou du rotor et de porter préjudice à, la durée de service ni aux conditions particulières du fonctionnement de la pompe.In any case, the chosen solution must not weaken the section of the end of the shaft and / or the rotor and be detrimental to, the service life or the specific conditions of operation of the pump.

Claims (4)

1. Rotor en matériau élastomérique ou analogue pour pompes auto-amorçan­tes pour produits liquides ou pâteux, constitué d'un corps annulaire (ou moyeu), pourvu d'ailettes extérieures radiales flexibles, caractérisé en ce qu'il comprend, en tant que parties intégrantes, des moyens pour l'accouplement rotatif de l'extrémité prédéterminée de l'arbre d'entrainement (A) de la pompe, lesquels moyens sont obtenus par estampage simultané du corps annulaire (C) et des ailettes radiales flexibles (R).1. Rotor made of elastomeric material or the like for self-priming pumps for liquid or pasty products, consisting of an annular body (or hub), provided with flexible radial external fins, characterized in that it comprises, as parts integral, means for the rotary coupling of the predetermined end of the drive shaft (A) of the pump, which means are obtained by simultaneous stamping of the annular body (C) and flexible radial fins (R). 2. Rotor flexible pour pompes auto-amorçantes selon la revendication 1, caractérisé en ce que lesdits moyens d'accouplement sont constitués d'une cloison ou nervure (D) traversant diamétralement un perçage (F) dudit rotor (G) et s'engageant dans une gorge correspondante (K) que présente l'extrémité de l'arbre (A).2. Flexible rotor for self-priming pumps according to claim 1, characterized in that said coupling means consist of a partition or rib (D) diametrically passing through a bore (F) of said rotor (G) and engaging in a corresponding groove (K) presented by the end of the shaft (A). 3. Rotor flexible pour pompes auto-amorçantes selon la revendication pré­cédente, caractérisé en ce que la cloison ou nervure diamétrale présente une longueur égale ou légèrement inférieure à celle du perçage (F) et une épaisseur (s) substantiellement égale à l'épaisseur (S) du moyeu (ou du corps annulaire) du rotor.3. Flexible rotor for self-priming pumps according to the preceding claim, characterized in that the partition or diametral rib has a length equal to or slightly less than that of the bore (F) and a thickness (s) substantially equal to the thickness ( S) of the hub (or of the annular body) of the rotor. 4. Pompe, en particulier pompe électrique auto-amorçante pour produits liquides ou pâteux utilisant un rotor flexible selon l'une ou plusieurs revendications précédentes.4. Pump, in particular self-priming electric pump for liquid or pasty products using a flexible rotor according to one or more preceding claims.
EP89104622A 1988-03-22 1989-03-15 Flexible rotor for self priming pumps Withdrawn EP0334189A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8819900A IT1216702B (en) 1988-03-22 1988-03-22 Flexible rotor for self-priming pump
IT1990088 1988-03-23

Publications (2)

Publication Number Publication Date
EP0334189A2 true EP0334189A2 (en) 1989-09-27
EP0334189A3 EP0334189A3 (en) 1990-03-28

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ID=11162183

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89104622A Withdrawn EP0334189A3 (en) 1988-03-22 1989-03-15 Flexible rotor for self priming pumps

Country Status (2)

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EP (1) EP0334189A3 (en)
IT (1) IT1216702B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2042736A2 (en) * 2007-09-26 2009-04-01 Bruno Wolhfarth SRL Direct joint system for drive shaft-flexible rotor for self-priming pumps

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659313A (en) * 1949-05-31 1953-11-17 Frank L Carson Rotary pump
FR2163935A5 (en) * 1971-12-07 1973-07-27 Rhone Poulenc Sa

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659313A (en) * 1949-05-31 1953-11-17 Frank L Carson Rotary pump
FR2163935A5 (en) * 1971-12-07 1973-07-27 Rhone Poulenc Sa

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2042736A2 (en) * 2007-09-26 2009-04-01 Bruno Wolhfarth SRL Direct joint system for drive shaft-flexible rotor for self-priming pumps
EP2042736A3 (en) * 2007-09-26 2011-08-10 Bruno Wolhfarth SRL Direct joint system for drive shaft-flexible rotor for self-priming pumps

Also Published As

Publication number Publication date
EP0334189A3 (en) 1990-03-28
IT1216702B (en) 1990-03-08
IT8819900A0 (en) 1988-03-22

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