EP2042736A2 - Direktverbindungssystem für einen flexiblen Antriebsschaft-Rotor für selbstansaugende Pumpen - Google Patents

Direktverbindungssystem für einen flexiblen Antriebsschaft-Rotor für selbstansaugende Pumpen Download PDF

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Publication number
EP2042736A2
EP2042736A2 EP08015679A EP08015679A EP2042736A2 EP 2042736 A2 EP2042736 A2 EP 2042736A2 EP 08015679 A EP08015679 A EP 08015679A EP 08015679 A EP08015679 A EP 08015679A EP 2042736 A2 EP2042736 A2 EP 2042736A2
Authority
EP
European Patent Office
Prior art keywords
rotor
self
flexible
priming pumps
rib
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Withdrawn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
EP08015679A
Other languages
English (en)
French (fr)
Other versions
EP2042736A3 (de
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 EP2042736A2 publication Critical patent/EP2042736A2/de
Publication of EP2042736A3 publication Critical patent/EP2042736A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/001—Pumps for particular liquids
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C15/0073—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/02—Rubber

Definitions

  • This invention refers to flexible rotors for self-priming pumps used for liquid and dense products.
  • the flexible rotors used nowadays in self-priming pumps are made up of an annular body supplied externally with flexible radial wings. These wings are obtained by a press-molding operation starting from elastomeric material such as silicone rubbers, neoprene (Cr), nitrile (NBR) and the like or the materials known with the trade mark name DUTRAL (EPDM).
  • elastomeric material such as silicone rubbers, neoprene (Cr), nitrile (NBR) and the like or the materials known with the trade mark name DUTRAL (EPDM).
  • this last rotor had in the previous technics a metallic bush having a section or shape corresponding to shaft end.
  • the bush was fixed into the rotor central hole during the press-molding phase of the body formed by the hub and radial wings. Obviously the presence of the internal bush, usually made of stainless steel, caused a rotor cost increase.
  • a further drawback of the metal bush was the incompatibility with the acid materials that have the tendency to corrode easily metals, also metals resisting to oxidation such as the stainless steel.
  • the bush external surface was sprinkled with a special glue or mastic. This construction did not allow its use in contact with foodstuffs according to European Community standards, also if the rotor, for example, was made of silicone certified for use with foodstuffs.
  • the aim of this invention is to provide a rotor press-molded in a sole piece with flexible external wings suitable for being used in self-priming pumps for liquid and dense products that avoids the disadvantages of well-known rotors and that has a simple and very economical construction, and that has a sure coupling with the pump shaft and finally that it can be used in any industry field, such as the chemical, pharmaceutical, cosmetic, foodstuff, oenological, liqueur, gassed drink fields, etc. and also with corrosive acids and foodstuff materials.
  • this aim is obtained creating a play between the shaft slot and the full rotor sector.
  • the rotor is made up of flexible material and has, as integral part, the rotation coupling means with the shaped shaft end made for driving the pump, said means being also obtained by a press-molding phase together with the hub and radial wings.
  • said means are made up of a rib or diametral wall having a valuable thickness that crosses the rotor hub hole and that is suitable to be engaged with a corresponding slot made on a pump shaft part.
  • the rotor made of elastomeric material or the like, is not supplied with additional o glued components (bush), and then it is not subject to its removal due to breackage of glueing points and it is possible its use in all possible fields owing to the absence of metallic components.
  • the rotor according to the invention is economical and has a long duration owing to its greater resistance.
  • the Figure 2 shows, among other parts, the input coupling E and output coupling U of the pump.
  • the shaft end A has a diametral slot K for being engaged by dry connection with the corresponding element made up of the rotor G, that is shown in more details in Figures 4 and 5 .
  • Said rotor includes an annular body C provided externally with flexible radial wings R and, according to the invention, a diametral wall or rib D obtained by press-molding together with the body C and wings R.
  • the press-molding operation is single and the used material is an elastomeric material and the like.
  • Said rib D forms the rotor element foreseen to be inserted in the slot K of the element A for forming a sure rotation coupling among these parts.
  • the construction solution of the rotor part foreseen to be engaged with the shaft can vary according to practical requirements. So, for example, instead of using a diametral rib, it can be used two ribs in cross form and also three radial ribs spaced by 120° with one another and, correspond-dingly, the shaft end shall have slots or grooves in cross layout or spaced by 120° with one another.
  • FIG. 6 shows another construction solution in Figures 6 and 7 , in which the Figure 6 shows another type of shaft section with groove shaped as two trapeziums counterposed with one another owing to a second embodiment, and the Figure 7 shows a central rotor part related to said second embodiment with central hole having the form of two trapeziums.
  • this solution has the advantage of a higher rest surface between shaft and rotor that allows to use also greater powers and then to obtain greater flow rates with respect to the ones provided by the connection made by right rib.
  • the construction solution must not cause the weakening of the shaft end section and/or of the rotor for not reducing its duration, also considering the particular pump running conditions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
EP08015679A 2007-09-26 2008-09-05 Direktverbindungssystem für einen flexiblen Antriebsschaft-Rotor für selbstansaugende Pumpen Withdrawn EP2042736A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20071849 ITMI20071849A1 (it) 2007-09-26 2007-09-26 Sistema ad incastro diretto di alberino trainante girante flessibile per pompe autoadescanti

Publications (2)

Publication Number Publication Date
EP2042736A2 true EP2042736A2 (de) 2009-04-01
EP2042736A3 EP2042736A3 (de) 2011-08-10

Family

ID=40011341

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08015679A Withdrawn EP2042736A3 (de) 2007-09-26 2008-09-05 Direktverbindungssystem für einen flexiblen Antriebsschaft-Rotor für selbstansaugende Pumpen

Country Status (2)

Country Link
EP (1) EP2042736A3 (de)
IT (1) ITMI20071849A1 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2163935A5 (de) * 1971-12-07 1973-07-27 Rhone Poulenc Sa
US4592733A (en) * 1983-12-12 1986-06-03 Outboard Marine Corporation Water pump for marine propulsion devices
IT1216702B (it) * 1988-03-22 1990-03-08 Bruno Wolfath S R L Girante flessibile per pompe autoadescanti.

Also Published As

Publication number Publication date
EP2042736A3 (de) 2011-08-10
ITMI20071849A1 (it) 2009-03-27

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