EP3803124B1 - Volumetrische rotationspumpe - Google Patents

Volumetrische rotationspumpe Download PDF

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Publication number
EP3803124B1
EP3803124B1 EP19726704.0A EP19726704A EP3803124B1 EP 3803124 B1 EP3803124 B1 EP 3803124B1 EP 19726704 A EP19726704 A EP 19726704A EP 3803124 B1 EP3803124 B1 EP 3803124B1
Authority
EP
European Patent Office
Prior art keywords
rotor
tab
shaft
seat
annular structure
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.)
Not-in-force
Application number
EP19726704.0A
Other languages
English (en)
French (fr)
Other versions
EP3803124A1 (de
Inventor
Leonardo Cadeddu
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.)
VHIT SpA
Original Assignee
VHIT SpA
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 VHIT SpA filed Critical VHIT SpA
Publication of EP3803124A1 publication Critical patent/EP3803124A1/de
Application granted granted Critical
Publication of EP3803124B1 publication Critical patent/EP3803124B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
    • F04C29/005—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C29/0071—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft

Definitions

  • the present invention relates to a rotary volumetric pump, in particular a vane pump, used to generate pneumatic pressure and/or vacuum, especially in dry vacuum pumps, i.e. vacuum pumps not lubricated by a fluid.
  • Vane pumps of the type comprising a rotary shaft to which a rotor may be connected by means of a drive coupling are known in the prior art.
  • This coupling is connected to the shaft in such a way as to avoid relative rotation. It has a ring from which two arms, that are engaged in corresponding seats afforded in the rotor, extend.
  • said arms have a substantially circular cross section and a conical longitudinal section, due to deformation by stamping.
  • the side wall of each of the arms has two opposite surfaces that are reciprocally domed and intended to come into contact with the flat surfaces of the corresponding rotor seats.
  • Said couplings are obtained by precision casting and the piece thus obtained is subjected to several machining operations by machine tools (typically on the inside of the hole of the annular coupling). This obviously slows down the production process, while requiring successive machining operations that increase costs.
  • One aim of the present invention is to provide a pump that allows optimisation of costs as well as distribution of the pressures acting on the surfaces.
  • a further aim is to reduce wear and maintain good centring.
  • the technical problem described and the aims specified are substantially achieved by a pump comprising the technical features defined in one or more of the attached claims.
  • the present invention relates to a rotary volumetric pump, preferably a vane pump (it may also possibly be a gear pump or other type of pump).
  • the pump is a dry pump.
  • it is a vacuum pump.
  • the pump is driven by an electric motor.
  • the pump comprises:
  • the rotor 3 houses the vanes 4 at least partially.
  • the rotor 3 has cavities 300 for housing the vanes 4.
  • Each of said cavities 300 extends between an inner radial position and an outer radial position.
  • said cavities 300 are inclined with respect to a purely radial direction.
  • the cavities 300 preferably pass completely through the rotor 3 in the axial direction.
  • Figure 4 shows a single one of said vanes 4, although each cavity 300 houses one.
  • the rotor 3 is made of carbon-graphite. Conveniently, the rotor 3 is a discoidal element. The rotor 3 is preferably coaxial with the shaft 2.
  • the pump comprises a stator element, not shown in the attached figures, which defines an opening in which the rotor 3 is housed.
  • the rotor 3 thus rotates inside the opening.
  • said vanes 4 project from the rotor 3 to a greater or lesser degree. Externally, the vanes 4 are touched by the stator element.
  • the pump further comprises means 5 for transmitting torque from the shaft 2 to the rotor 3.
  • the transmission means 5 comprise/coincide with a transmission coupling.
  • the rotor 3 comprises a first seat 31.
  • the first seat 31 comprises a side wall 310 (see figure 3 ).
  • the side wall 310 comprises a first flat portion 311 (shown in figure 4 ).
  • the side wall 310 advantageously also comprises a second flat portion 312, opposite the first flat portion 311, and advantageously two connection zones located at opposite ends of the first seat 31.
  • the first seat 31 advantageously comprises an end wall 313.
  • the first portion 311 lies in a first plane
  • the second portion 312 lies in a second plane parallel to the first plane.
  • the transmission means 5 comprise an annular structure 50.
  • the annular structure 50 is preferably obtained from a sheet of stainless steel. It is applied to the shaft 2.
  • the shaft 2 is engaged in (and through) a hole 59 defined by the annular structure 50.
  • the shaft 2 and the annular structure 50 are coupled by interference.
  • the torque is thus transmitted by the shaft 2 to the annular structure 50, which in turn transmits the torque to the rotor 3.
  • the annular structure 50 is removably connected to said rotor 3.
  • the annular structure 50 in turn comprises at least one first projecting tab 51 that at least in one operating configuration of the pump is engaged in said first seat 31 of the rotor 3. Said projecting tab 51 is for transmitting the movement of the annular structure 50 to the rotor 3.
  • the first tab 51 comprises at least one first flat surface 510.
  • the first tab 51 has a mainly longitudinal direction of extension.
  • the longitudinal direction of the first tab 51 extends in an axial direction.
  • the first tab 51 comprises a second flat surface 511 which is positioned on the opposite side to the first flat surface 510.
  • the first tab 51 has a rectangular section.
  • the corner does not have any burrs, as a result of the actual cutting process.
  • the two vertices 55 are at the ends of the first surface 510.
  • the first flat surface 510 is a surface that pushes the rotor 3 and is in contact with said first flat portion 311 of said wall 310 of the first seat 31.
  • the direction of rotation of the shaft 2 is such as to bring the first surface 510 to press against the first portion 311.
  • the second flat surface 511 in the operating configuration, faces the second portion 312 of the side wall 310.
  • This first surface 510 is a zone of contact with the rotor 3.
  • the first surface 510 has a mainly longitudinal extension that extends parallel to the axis of rotation of the shaft 2.
  • the first surface 510 has a larger radial extension component than a tangential extension component (said tangential component may even be zero).
  • the radial extension is evaluated with respect to the axis of rotation of the shaft 2.
  • the tangential component is evaluated tangentially to circumferences centred on the axis of rotation of the shaft 2. This orientation makes it possible to transfer torque to the rotor 3, reducing localised stresses and improving specific pressure spikes (by virtue of the increased areas of contact).
  • the first surface 510 lies in a plane that also contains the axis of rotation of the shaft 2.
  • the first tab 51 is a portion of sheet less than 1.5 millimetres thick.
  • the first tab 51 for example, extends longitudinally over a length of between 5 and 9 millimetres.
  • the first tab 51 has a width of between 2 and 4 millimetres.
  • the annular structure 50 comprises a central crown 500 from which there extends an L-shaped structure 501, which defines said first tab 51.
  • the annular structure 50 comprises a second projecting tab 52 which, in the operating configuration, is engaged in a second seat 32 afforded in the rotor 3.
  • the first and second tabs 51, 52 are advantageously in diametrally opposite positions.
  • the description provided with reference to the first tab 51 may be repeated for the second tab 52.
  • the description provided with reference to the first seat 31 may be repeated for the second seat 32.
  • the description provided with reference to the first tab 51 and the interaction thereof with the first seat 31 may be repeated for the second tab 52 and the interaction thereof with the second seat 32.
  • the second tab 52 may comprise a thrust surface 520. Said thrust surface 520 is flat. It is contained entirely in the plane containing the first surface 510 and the axis of rotation of the shaft 2.
  • the rotor 3 preferably comprises a housing 30 in which, in said operating configuration, said central crown 500 is completely inserted.
  • the rotor 3 comprises an axial portion 56 in correspondence with which the radial play with the shaft 2 is minimal.
  • the first tab 51 extends internally inside the first seat 31 only (or at least for 90%) in correspondence with said axial portion 56 in correspondence with which the radial play is minimal.
  • the same may be said of the second tab 52 which extends inside the second seat 32. The purpose of these arrangements is to ensure that the transmission of torque to the rotor 3 by the means 5 (the coupling) takes place in a zone where the rotor 3 is well guided by the shaft 2 so as to prevent small errors of shape leading to misalignments.
  • the present invention also relates to a method for realising a pump.
  • said pump comprises one or more of the features described above.
  • the method comprises the step of realising the annular structure 50.
  • This advantageously takes place in a progressive stamping die, which works on a "sheet strip", in which a series of operations take place in succession. When the part leaves the progressive stamping die, no machining is performed to remove additional shavings from the annular structure 50. This renders production more rapid and less costly.
  • the step of realising the annular structure 50 comprises the step of shaping a sheet (which is conveniently at least initially flat) by cutting and drawing to form a central crown 500 from which at least one lateral arm 501 extends. At least in this step, the central crown 500 advantageously remains connected to the surrounding sheet by means of at least one connection point which, in this step, is not cut (this happens only later).
  • the drawing determines a thickening of the central crown 500 whose thickness becomes greater than that of the initial sheet. This facilitates transmission of the torque from the shaft 2.
  • the step of realising the annular structure 50 comprises bending the lateral arm 501 to define the first tab 51. This involves bending the arm 501 by an angle of between 70° and 110°, preferably 90°.
  • the longitudinal extension of the lateral arm 501 has two curves (see figure 6 ):
  • the method further comprises the step of inserting the shaft 2 into the hole 59 of said annular structure 50. This takes place after the annular structure 50 is complete.
  • the shaft 2 and the annular structure 50 are normally connected by interference.
  • the method further comprises the step of inserting the shaft 2 into the rotor 3 (connecting the annular structure 50 and the rotor 3). This comprises the step of inserting the first tab 51 into the first seat 31 of the rotor 3 (and, advantageously, the second tab 52 is also inserted into the second seat 32).
  • the present invention affords significant advantages.
  • a further significant advantage relates to the good centring between the rotor 3 and the shaft 2 thanks to coupling with reduced play which allows sufficient dynamic oscillation to make up for the errors in orthogonality from production, while limiting wear; this is also thanks to the abovementioned configuration of the coupling 5.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)
  • Reciprocating Pumps (AREA)

Claims (9)

  1. Volumetrische Pumpe, die Folgendes umfasst:
    - eine Welle (2), geeignet zum Rotieren um eine Rotationsachse;
    - einen Rotor (3);
    - ein Mittel (5) zum Übertragen von Drehmoment von der Welle (2) auf den Rotor (3); wobei der Rotor (3) einen ersten Sitz (31) umfasst, umfassend eine Seitenwand (310), umfassend einen ersten flachen (311) Teil;
    wobei das Übertragungsmittel (5) eine ringförmige Struktur (50) umfasst, die fest an die Welle (2) gebunden und mit dem Rotor (3) verbunden ist; wobei die ringförmige Struktur (50) ihrerseits zumindest eine erste herausragende Nase (51) umfasst, die zumindest in einer Betriebsauslegung der Pumpe im Eingriff mit dem ersten Sitz (31) des Rotors (3) ist; wobei die erste Nase (51) zumindest eine erste flache Oberfläche (510) umfasst; dadurch gekennzeichnet, dass in der Betriebsauslegung die erste flache Oberfläche (510) eine Schuboberfläche ist und in Kontakt mit dem ersten flachen Teil (311) der Seitenwand (310) des ersten Sitzes (31) ist;
    wobei die erste Nase (51) eine größere radiale Ausdehnungskomponente als eine tangentiale Ausdehnungskomponente aufweist, wobei die radiale Ausdehnung bezüglich der Rotationsachse der Welle (2) evaluiert wird, wobei die tangentiale Komponente tangential zu Umfängen, zentriert an der Rotationsachse der Welle (2), evaluiert wird.
  2. Pumpe nach Anspruch 1, dadurch gekennzeichnet, dass sie zumindest eine zweite herausragende Nase (52) umfasst, die in der Betriebsauslegung im Eingriff mit einem im Rotor (3) bereitgestellten zweiten Sitz (32) ist.
  3. Pumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die erste Nase (51) ein Teil eines weniger als 1,5 Millimeter dicken Bleches ist.
  4. Pumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Rotor (3) aus Carbon-Graphit gefertigt ist, wobei die ringförmige Struktur (50) aus einem Blech aus Edelstahl erhalten wird.
  5. Pumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die ringförmige Struktur (50) eine zentrale Krone (500) umfasst, von der aus sich die erste Nase (51) erstreckt.
  6. Pumpe nach Anspruch 5, dadurch gekennzeichnet, dass die erste Nase (51) in einer L-förmigen Struktur (501) integriert ist, die sich von der zentralen Krone (500) aus erstreckt.
  7. Pumpe nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass der Rotor (3) ein Gehäuse (30) umfasst, in den in der Betriebsauslegung die zentrale Krone (500) vollständig eingesetzt ist; wobei sich der erste Sitz (31), in dem die erste Nase (51) im Eingriff ist, parallel zur Rotationsachse der Welle (2) von dem Gehäuse (30) aus erstreckt.
  8. Verfahren zum Umsetzen einer Pumpe nach Anspruch 5 oder 6 oder 7, dadurch gekennzeichnet, dass es die folgenden Schritte umfasst:
    a) Umsetzen der ringförmigen Struktur (50), was die folgenden Schritte umfasst:
    - Formen eines Bleches durch Schneiden und Ziehen zum Bilden einer zentralen Krone (500), von der aus sich zumindest ein lateraler Arm (501) erstreckt;
    - Biegen des lateralen Arms (501) zum Definieren der ersten Nase (51);
    b) Einsetzen der Welle (2) in ein Loch (59) der ringförmigen Struktur (50);
    c) Einsetzen der ersten Nase (51) in den ersten Sitz (31) des Rotors (3).
  9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass das Ziehen eine Verdickung der zentralen Krone (500) bestimmt, deren Dicke größer als die des anfänglichen Bleches wird.
EP19726704.0A 2018-05-30 2019-05-29 Volumetrische rotationspumpe Not-in-force EP3803124B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102018000005866A IT201800005866A1 (it) 2018-05-30 2018-05-30 Pompa volumetrica rotativa
PCT/EP2019/063911 WO2019229106A1 (en) 2018-05-30 2019-05-29 Rotary volumetric pump

Publications (2)

Publication Number Publication Date
EP3803124A1 EP3803124A1 (de) 2021-04-14
EP3803124B1 true EP3803124B1 (de) 2022-03-30

Family

ID=63312336

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19726704.0A Not-in-force EP3803124B1 (de) 2018-05-30 2019-05-29 Volumetrische rotationspumpe

Country Status (4)

Country Link
EP (1) EP3803124B1 (de)
CN (1) CN112543845A (de)
IT (1) IT201800005866A1 (de)
WO (1) WO2019229106A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019124262A1 (de) * 2019-09-10 2021-03-11 HELLA GmbH & Co. KGaA Flügelzellenpumpe

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20010521A1 (it) * 2001-06-01 2002-12-01 Vhit Spa Rotore soggetto a ridotta usura, e pompa comprendente tale rotore.
DE102007019283A1 (de) * 2007-04-24 2008-11-06 Robert Bosch Gmbh Förderaggregat
JP2010112332A (ja) * 2008-11-10 2010-05-20 Fuji Oozx Inc ベーン式バキュームポンプ
DE102010001240A1 (de) * 2010-01-27 2011-07-28 Robert Bosch GmbH, 70469 Flügelzellenpumpe
DE102015224357A1 (de) * 2015-12-04 2017-06-08 Robert Bosch Gmbh Förderaggregat

Also Published As

Publication number Publication date
WO2019229106A1 (en) 2019-12-05
CN112543845A (zh) 2021-03-23
IT201800005866A1 (it) 2019-11-30
EP3803124A1 (de) 2021-04-14

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