EP3536961A2 - Pompe à vide à élément d'étanchéité - Google Patents

Pompe à vide à élément d'étanchéité Download PDF

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Publication number
EP3536961A2
EP3536961A2 EP19161064.1A EP19161064A EP3536961A2 EP 3536961 A2 EP3536961 A2 EP 3536961A2 EP 19161064 A EP19161064 A EP 19161064A EP 3536961 A2 EP3536961 A2 EP 3536961A2
Authority
EP
European Patent Office
Prior art keywords
rotor
rotary pump
drive shaft
delivery chamber
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.)
Granted
Application number
EP19161064.1A
Other languages
German (de)
English (en)
Other versions
EP3536961B1 (fr
EP3536961C0 (fr
EP3536961A3 (fr
Inventor
Roman Ickert
Stefan Küchle
Volker Stöhr
Tobias Iser
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.)
Schwaebische Huettenwerke Automotive GmbH
Original Assignee
Schwaebische Huettenwerke Automotive GmbH
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 Schwaebische Huettenwerke Automotive GmbH filed Critical Schwaebische Huettenwerke Automotive GmbH
Publication of EP3536961A2 publication Critical patent/EP3536961A2/fr
Publication of EP3536961A3 publication Critical patent/EP3536961A3/fr
Application granted granted Critical
Publication of EP3536961B1 publication Critical patent/EP3536961B1/fr
Publication of EP3536961C0 publication Critical patent/EP3536961C0/fr
Active 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
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/005—Axial sealings for working fluid
    • F04C27/006—Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type pumps, e.g. gear pumps
    • 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
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0007—Radial sealings for working fluid
    • 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
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/001—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of similar working principle
    • 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/32—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having both the movement defined in groups F04C2/02 and relative reciprocation between co-operating members
    • 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
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
    • 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
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
    • 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
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/001—Radial sealings for working fluid
    • 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
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C27/009—Shaft sealings specially adapted for pumps
    • 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
    • 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
    • F04C2230/00—Manufacture
    • F04C2230/60—Assembly methods
    • 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
    • F04C2240/00—Components
    • F04C2240/50—Bearings
    • 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
    • F04C2240/00—Components
    • F04C2240/60—Shafts
    • F04C2240/605—Shaft sleeves or details thereof
    • 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
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/17—Tolerance; Play; Gap

Definitions

  • the invention relates to a rotary pump, in particular a vacuum pump for a motor vehicle, having a delivery chamber, which has an inlet on a low pressure side and an outlet on a high pressure side, with at least one rotor, which is arranged in the delivery chamber and a fluid from the inlet into the delivery chamber Promotes delivery chamber to the outlet from the delivery chamber, and with a drive shaft which is drivingly connected to the rotor.
  • a rotary pump in particular a vacuum pump, for example a vacuum pump for a motor vehicle, having a delivery chamber, which has an inlet on a low-pressure side and an outlet on a high-pressure side, at least one rotor, which is arranged in the delivery chamber and a Fluid from the inlet into the delivery chamber to the outlet from the delivery chamber promotes, and a drive shaft, which is drivingly connected to the rotor.
  • the rotary pump furthermore has a housing part which at least axially delimits the delivery chamber.
  • the rotary pump comprises at least one sealing element which forms a radial sealing gap with the housing part in a sealing region.
  • the sealing element and the housing part together also form an axial gap.
  • the axial gap is greater than the radial sealing gap.
  • axial and radial are particularly related to the axis of rotation of the drive shaft and / or the rotor, so that the term “axially” in particular denotes a direction which is parallel or coaxial with the axis of rotation. Further, the term “radial” refers in particular to a direction which is perpendicular to the axis of rotation.
  • a “radial extent” is to be understood in particular an extension along or parallel to a radial direction.
  • An “axial extent” is to be understood in particular an extent along or parallel to an axial direction.
  • the rotor has a conveyor element carrier with at least one rotor slot and at least one axially and radially guided in the rotor slot conveyor element, which divides the delivery chamber into at least two delivery cells.
  • the conveyor element carrier is advantageously formed integrally with the drive shaft.
  • the at least one sealing element is slidably and / or rotationally fixed to the drive shaft and / or the rotor, in particular the conveyor element carrier connected.
  • the at least one sealing element is formed in one piece by the drive shaft and / or the rotor, in particular the conveyor element carrier.
  • one-piece should be understood in particular in one piece molded, such as by a production from a cast, in a sintering process and / or by a production in a one- or multi-component injection molding or advantageously from a single blank.
  • the sealing element is advantageously formed by the material of the drive shaft and / or the rotor, in particular of the conveyor element carrier.
  • the at least one sealing element is preferably made of a blank or of a material, for example a metal powder in a sintering process or a plastic or metal in an injection molding process, together with the rotor, in particular the conveyor element carrier, or with the drive shaft or with the rotor, in particular the bainelementizi, and the drive shaft formed.
  • the sealing element can be integrally connected to the drive shaft and / or the rotor, in particular the conveyor element carrier, for example by a welding process, an adhesive process, an injection molding process or the like.
  • the sealing element is non-positively and / or positively connected to the drive shaft and / or the rotor, in particular the conveyor element carrier, for example by pressing, a toothing or the like.
  • the drive shaft is preferably mounted in the housing part in at least one storage area, in particular slide-mounted.
  • the storage area is advantageously designed as a plain bearing area.
  • an outer circumferential surface of the drive shaft having an inner peripheral surface of an opening or bore in the housing part may form a radial bearing gap serving, for example, to lubricate the storage area.
  • a mean distance between the outer peripheral surface of the drive shaft and the inner peripheral surface of the opening in the housing part is smaller than an average dimension of the radial sealing gap, which forms the sealing element with the housing part. That is, the radial bearing gap is smaller or narrower in the radial direction than the radial sealing gap, the Forms sealing element.
  • the sealing element is preferably arranged without contact to the housing part.
  • the radially directed outer peripheral surface of the sealing element preferably lacks contact with the housing part.
  • An axial extent of the bearing area or of the radial bearing gap is at least twice as large, advantageously at least three times as large and particularly advantageously at least four times as large as an axial extent of the sealing area or of the radial sealing gap.
  • the storage area (and thus the radial bearing gap) and the sealing area (and thus the radial sealing gap) are formed completely outside the delivery space of the rotary pump.
  • the radial sealing gap can reach up to an axial end face of the delivery chamber.
  • the radial sealing gap is formed in the axial direction of the rotary pump between the delivery chamber and the radial bearing gap.
  • the axial gap between the sealing element and the housing part is preferably arranged axially between the radial sealing gap and the radial bearing gap.
  • the drive shaft is mounted in at least two mutually axially spaced storage areas in the housing part, in particular sliding bearings.
  • the radial bearing gap in the bearing areas is preferably smaller in the radial direction than the radial sealing gap.
  • the axial extent of the bearing areas is at least twice as large, advantageously at least three times as large and particularly advantageously at least four times as large as the axial extent of the radial sealing gap.
  • the sealing element seals the rotary pump radially preferably on an axial end side, so that no or as little as possible fluid can escape from the delivery chamber.
  • the sealing element can form a compensation device that can compensate for manufacturing tolerances along the drive shaft.
  • the sealing element preferably has an outer diameter that is greater than or equal to an outer diameter of the rotor, in particular greater than or equal to an outer diameter of the conveyor element carrier.
  • the sealing element has an outer diameter which is larger than an outer diameter of the drive shaft, in particular larger than the outer diameter of the drive shaft in the storage area.
  • the rotor, in particular the conveyor element carrier, at each axial end faces each have a sealing element, wherein the axial extent of a bearing area is greater than the sum of the axial extent of the radial sealing gaps of the two sealing elements.
  • the rotor may comprise a separate conveyor element carrier or form this conveyor element carrier, which can be positively, positively and / or materially connected to the drive shaft so that the rotor or conveyor element carrier does not rotate relative to the drive shaft and preferably not linearly displaced relative to the drive shaft can be.
  • the rotor or conveyor element carrier may for example be pressed onto the drive shaft and / or be welded or screwed.
  • the conveyor element carrier may be integral with a central opening, or consist of two half-shells, which are joined together and thereby, for example, positively, positively and / or materially connected to the drive shaft.
  • the conveyor element carrier can form the at least one sealing element, in which case an outer diameter of the sealing element and an outer diameter of the rotor or of the conveyor element carrier can be substantially identical.
  • the at least one sealing element may be formed integrally with the drive shaft.
  • the outer diameter of the sealing element formed by the drive shaft may be substantially the same size as an outer diameter of the rotor or of the conveyor element carrier.
  • the rotor is preferably arranged completely in the delivery chamber when the rotary pump is assembled.
  • the rotor preferably forms, for example, with a further rotor or with the aid of conveying elements, such as teeth, vanes, pendulum slides, etc., conveying cells which convey the fluid from the inlet into the conveying space to the outlet from the conveying space.
  • conveying elements such as teeth, vanes, pendulum slides, etc.
  • conveying cells which convey the fluid from the inlet into the conveying space to the outlet from the conveying space.
  • the fluid can be compressed, for example, in the case of an eccentric arrangement of the rotor in the delivery chamber, or the pressure in the fluid can be increased in the case of a fluid which is less compressible.
  • the rotor, or at least a portion of the rotor, in particular the conveyor element carrier in a rotary pump designed as a vane pump or pendulum slide pump, and the sealing element may be formed integrally with the drive shaft.
  • the drive shaft may form, for example, only the part of the rotor or the conveyor element carrier which can receive the wings, pendulums, etc., which are then guided along an inner circumferential wall of the pumping chamber during operation of the rotary pump and together with the inner peripheral wall the conveyor cells form.
  • the rotor is formed by the conveyor element carrier and the said conveyor elements, such as wings or pendulum.
  • the conveyor element carrier is preferably formed integrally with the drive shaft.
  • the drive shaft may form the entire rotor, for example a gear, which meshes with another gear that can be guided with an outer radial circumferential side on the inner peripheral wall of the delivery chamber.
  • the rotor may be arranged eccentrically in the pumping chamber, which then leads to change in volume conveyor cells upon rotation of the rotor.
  • the housing part which axially delimits the delivery chamber such as, for example, a bottom and / or a cover, which axially closes off the delivery chamber, can form a surface which faces axially the delivery chamber.
  • an intake pocket axially open to the delivery chamber may be formed, in which extends the at least one sealing element.
  • An axial extent or depth of the insertion pocket is preferably greater than the axial extent of the sealing element, so that via the sealing element, if it has, for example, an outer diameter which at least substantially equal to or greater than an outer diameter of the rotor or the conveyor element carrier, for example manufacturing tolerances Drive shaft can be compensated.
  • the immersion pocket is advantageously a depression which is introduced into the housing part and into which the sealing element extends axially when the rotary pump is assembled or in which it is arranged.
  • the sealing element advantageously undergoes no guidance in the insertion pocket.
  • the insertion pocket is arranged in the housing part adjacent to the delivery space and in front of the opening which forms the storage area for the drive shaft, so that a peripheral groove results in the housing part, which preferably directly adjoins the delivery space.
  • the insertion pocket is designed to be axially open to the delivery chamber and radially to the drive shaft.
  • the dipping bag can in Cover and / or be introduced in the bottom of the pumping chamber.
  • An outer diameter of the insertion pocket may be equal, smaller or larger than an outer diameter of the delivery chamber.
  • the outer diameter of the insertion pocket should preferably be understood here to be the distance between two points located opposite one another in the radially outer peripheral surface of the insertion pocket, relative to a longitudinal central axis of the delivery space.
  • An axial extension of the insertion pocket should in particular be greater than a maximum axial clearance of the drive shaft, which is determined for example by manufacturing and / or assembly tolerances of the housing and / or the connection of the rotor and the drive shaft.
  • the axial extent of the insertion pocket is advantageously at least twice and particularly advantageously at least three times as large as the axial extent of the storage area.
  • the housing of the rotary pump for example, a lid which closes the delivery chamber at a first axial side or a first axial end, and a bottom, which is disposed opposite to the cover axially opposite the delivery chamber and a second axial side of the delivery chamber terminates.
  • the bottom may be formed with the housing as a unit, so that the delivery chamber is pot-shaped and can be closed with the lid.
  • the dipping pocket can, as already mentioned, be incorporated in the cover and / or in the bottom, which axially delimit the delivery chamber. If each axial end in each case comprises an insertion pocket, then the insertion pockets in the base and cover and the sealing elements projecting into or arranged on them can have identical or different diameters and identical or different axial extensions. It is preferred if in this case both sealing elements are identical.
  • the radial sealing gap which is formed by a radial outer circumferential surface of the sealing element and a radial inner peripheral surface of the insertion pocket facing the sealing element, can be filled with a fluid, for example, in order to radially seal the delivery chamber.
  • the inflow of the fluid into the insertion pocket can be, for example, a leakage flow along the drive shaft in the bearing gap and / or a fluid, in particular a fluid conveyed by a fluid delivery pump, can be conducted via at least one channel directly into the insertion pocket.
  • the drive shaft may have an axial groove to assist in the delivery of the fluid into the insertion pocket.
  • the sealing gap may have an approximately equal radial extent or gap thickness over its axial extension, that is, the radial outer peripheral surface of the sealing element and the radial inner peripheral surface of the insertion pocket are parallel to each other.
  • the sealing gap may have a radial gap thickness varying over its axial extension, for example being wedge-shaped, having regions of decreasing and increasing gap thickness, or otherwise having different gap thicknesses.
  • At least the radial outer peripheral surface of the sealing element may be roughened at least in a circumferential axial portion or have a profile which may be advantageous for the radial seal.
  • the drive shaft is mounted in the housing, respectively in the housing part outside the delivery chamber, in particular sliding bearings.
  • the drive shaft has at least one storage area.
  • the sealing element is preferably arranged axially between a storage area and the delivery space in the dipping pocket.
  • An axial extension of the bearing region of the drive shaft is preferably substantially larger than an axial extension of the sealing element, in particular as an axial extension of the insertion pocket.
  • the axial extent of the bearing region of the drive shaft is advantageously at least twice, particularly advantageously at least three times and very particularly advantageously at least four times as large as the axial extent of the sealing element, in particular as the axial extension of the insertion pocket.
  • the rotor slot of the conveyor element carrier preferably extends axially into the drive shaft, so that the rotor slot axially overlaps the sealing element in the region of the rotor slot.
  • the rotor slot advantageously extends axially out of the delivery chamber at least on one axial side.
  • the rotor slot advantageously extends at least on one axial side axially into a bearing region of the drive shaft.
  • the rotor slot may have an axial extent or length that is at least as long as the axial extent or length of the rotor plus the axial extent of the rotor at least one sealing element or the dipping pocket.
  • the axial extent or length of the rotor slot is larger.
  • An axial passer stretch or fitting length of the rotor is preferably at least as long as the axial extent of the rotor plus a maximum axial clearance of the drive shaft.
  • the area of the rotor slot should preferably apply here, in which, for example, a wing of the rotor can be moved unhindered transversely to the axis of rotation in the rotor slot, independently of, for example, axial play of the drive shaft.
  • the sealing element is formed as an axial extension of the conveyor element carrier, which extends from the delivery chamber axially into the housing part.
  • This extension preferably undergoes no guidance and / or storage and / or centering in the housing part.
  • a guide and / or storage and / or centering of the drive shaft is advantageously carried out only in the at least one storage area and not in the provided by the at least one sealing element or extension sealing area.
  • a second aspect of the invention relates to a pump unit having a first rotary pump with a delivery chamber, in which at least one rotor is arranged, which transfers a first fluid from an inlet into the delivery chamber on a low-pressure side of the first rotary pump to an outlet from the delivery chamber on a high-pressure side first rotary pump, with a second rotary pump having a delivery chamber in which at least one rotor is arranged, which promotes a second fluid from an inlet into the delivery chamber on a low pressure side of the second rotary pump to an outlet from the delivery chamber on a high pressure side of the second rotary pump, and with a drive shaft for driving both rotary pumps, wherein the rotor of the first rotary pump and the rotor of the second rotary pump are axially displaceable and non-rotatably connected to the drive shaft.
  • the drive shaft is a one-piece drive shaft with a continuous axis of rotation. That is, the drive shaft extends through the delivery chamber of the first rotary pump and through the delivery chamber of the second rotary pump, and preferably at least one axial end of the drive shaft may extend out of a housing of the pumping unit to be connected to a drive.
  • the drive shaft may be integral with at least a portion of the rotor of the first rotary pump and / or a portion of the rotor of the second rotary pump form as described in the first aspect.
  • At least one part of at least one of the rotors can be pressed onto the rotor shaft or otherwise rotatably connected to the rotor and preferably also linearly non-movably or adjustably connected in the axial direction, see also the description of the drive shaft to the first aspect.
  • the first fluid and the second fluid are different fluids.
  • the fluid of the first rotary pump which may be, for example, a liquid feed pump may be a lubricating oil, with which the first rotary pump and / or the second rotary pump and / or at least one unit, for example, a drive motor, such as a combustion, a hybrid or electric motor of a motor vehicle to be supplied with lubricating oil.
  • the second fluid of the second rotary pump which may be a gas pump or vacuum pump, may be a gas which is withdrawn to generate a vacuum, for example from an aggregate, in particular a brake booster of a motor vehicle.
  • the first and / or the second rotary pump can in particular be a rotary pump according to the first aspect, with a sealing element which is formed by the rotor, in particular conveyor element carrier, and / or the drive shaft and forms a radial sealing gap with a housing part ,
  • the sealing element or the sealing elements can be compensated in this arrangement, in particular a manufacturing tolerance at a distance between the rotor of the first rotary pump and the rotor of the second rotary pump, for example, by pressing at least one of the rotors, in particular one of the conveyor element carrier, on the drive shaft in the system or arrangement is entered.
  • the sealing element engaging in the immersion pocket can form a compensation device in the assembled pump or pump unit with which axial play in the system along the drive shaft can be compensated for, for example, by manufacturing tolerances, without the sealing of the delivery chamber being canceled becomes.
  • An immersion pocket can be formed, for example, in a bottom of at least one of the delivery chambers of the rotary pumps, wherein the bottom seals the delivery chamber with respect to the environment of the pumping unit as a rule. Additionally or alternatively, one or another immersion pocket may be formed in at least one lid of one of the rotary pumps.
  • the cover may be a housing part which encloses the delivery space of the first rotary pump from the delivery space of the second rotary pump separates and has an opening which can be penetrated by the drive shaft.
  • the insertion pocket is formed as a radial widening of the opening in the cover facing the delivery chamber.
  • the rotor shaft or drive shaft may have a fluid groove in the area of the insertion pocket in the lid and / or bottom of the rotary pump.
  • the fluid groove may preferably be formed circumferentially in the shaft. For example, fluid from the dip pocket may flow into the rotor slot via the fluid groove to lubricate the moving parts of the rotor and / or to seal the delivery cells of a delivery chamber from each other.
  • the fluid or fluid delivery pump may be an internal-axis pump, such as a rotary piston pump, a piston shuttle pump, a vane pump, a pendulum vane pump, an internal gear pump, or an internal-axis pump known in the art, or an external-axis pump such as a pump External gear pump, act.
  • an internal-axis pump such as a rotary piston pump, a piston shuttle pump, a vane pump, a pendulum vane pump, an internal gear pump, or an internal-axis pump known in the art, or an external-axis pump such as a pump External gear pump, act.
  • the gas or vacuum pump may be an internal-axis pump such as a rotary piston pump, a reciprocating pump, a vane pump, a reciprocating vane pump, an internal gear pump, or an internal-axis pump known in the art, or an outside-axis pump such as an external gear pump, act.
  • an internal-axis pump such as a rotary piston pump, a reciprocating pump, a vane pump, a reciprocating vane pump, an internal gear pump, or an internal-axis pump known in the art, or an outside-axis pump such as an external gear pump, act.
  • the pump unit which consists of at least one fluid delivery pump and at least one vacuum pump, may for example be attached to an engine, in particular an internal combustion engine of a motor vehicle or may be provided for attachment to this engine.
  • the drive shaft of the pump unit may be drivingly connected to the motor, so that the pump unit is driven or controlled at least temporarily in dependence on the engine or by a map with engine-dependent parameters.
  • the pump unit can be driven by its own drive, such as an electric motor.
  • the FIG. 1 shows a longitudinal section through an embodiment of a pump unit according to the invention.
  • the pump unit comprises a first rotary pump 1, which as Liquid supply pump is formed, and a second rotary pump 2, which is designed as a vacuum pump.
  • the pumping unit may be referred to as a tandem pump.
  • the pump unit is provided for a motor vehicle, wherein the first rotary pump 1 is used for lubricating an internal combustion engine of the motor vehicle, and the second rotary pump 2 is used to provide a vacuum for a brake booster of the motor vehicle.
  • the rotary pump 1 comprises a delivery chamber 11, in which a rotor 12 is arranged.
  • the rotary pump 2 comprises a delivery chamber 21, in which a rotor 22 is arranged.
  • the rotor 12 and the rotor 22 are drivingly connected to a common continuous drive shaft 3.
  • the rotors 12, 22 are driven in rotation by the drive shaft 3.
  • the rotor 12 is arranged completely in the conveying space 11.
  • the rotor 12 comprises a conveyor element carrier 6 and a plurality of conveying elements, which are received radially displaceable by the conveyor element carrier 6.
  • the conveyor element carrier 6 has a plurality of rotor slots.
  • the conveyor element carrier 6 is rotatably and non-displaceably connected to the drive shaft 3.
  • the conveyor element carrier 6 is pressed onto the drive shaft 3.
  • the conveying elements are designed as wings.
  • the first rotary pump 1 is formed as a vane pump.
  • the rotor 22 is arranged completely in the delivery chamber 21.
  • the rotor 22 comprises a conveyor element carrier 5 and a conveyor element 4, which is received radially displaceable by the conveyor element carrier 5.
  • the conveyor element carrier 5 has a rotor slot 32 which in the FIGS. 3 to 6 clearly shown and described in detail.
  • the rotor slot 32 extends axially into the drive shaft 3.
  • the conveyor element carrier 5 is rotatably and non-displaceably connected to the drive shaft 3.
  • the conveyor element carrier 5 is formed integrally with the drive shaft 3.
  • the drive shaft 3 forms the conveyor element carrier 5 in one piece.
  • the conveying element 4 is designed as a wing.
  • the second rotary pump 2 is formed as a vane pump.
  • the rotor 12, 22 together with an inner peripheral wall of the respective delivery chamber 11, 21 conveyor cells, in which the fluid, whether liquid or gas, from an inlet into the Delivery chamber 11, 21 is transported to an outlet from this delivery chamber 11, 21 and thereby compressed in an eccentric arrangement of the rotor 12, 22 in the delivery chamber 11, 21 and / or can be lifted to a higher pressure level.
  • the rotary pumps 1, 2 comprise a common pump housing.
  • the pump housing has the housing parts 13, 14, 23, 24.
  • the two housing parts 13, 23 are combined in a housing part. They are formed by a single housing part.
  • the housing part 24 forms a bottom of the delivery chamber 21 of the second rotary pump 2 with a central opening through which the drive shaft 3 can be connected to a drive, not shown.
  • the housing part 24 closes an axial end face of the delivery chamber 21 on the side facing away from the first rotary pump 1.
  • On the first rotary pump 1 facing end side of the delivery chamber 21 is closed by the housing part 23, which simultaneously forms the housing part 13 for an axial end face of the delivery chamber 11 of the first rotary pump 1 and an opening through which the drive shaft 3 from the delivery chamber 21 in extends the delivery chamber 11.
  • the second axial end face of the delivery chamber 11 is closed by the housing part 14.
  • the drive shaft 3 is mounted in the pump housing by means of three axially spaced plain bearings.
  • the drive shaft 3 has three axially spaced storage areas 7, 8, 9.
  • the drive shaft 3 is slidably mounted in the bearing portion 9 in the housing part 14, in the bearing area 7 in the common housing part 13, 23 and in the bearing area 8 in the housing part 24.
  • the outer peripheral surface of the drive shaft 3 and the radially inner circumferential surfaces of the housing parts 14, 13, 23, 24 form a bearing gap S L.
  • the delivery chamber 11 of the first rotary pump 1 is arranged axially between the storage area 9 and the storage area 7.
  • the delivery chamber 21 of the second rotary pump 2 is arranged axially between the storage area 7 and the storage area 8.
  • the second rotary pump 2 comprises two axially spaced sealing elements 26, 27, which extend outside of the delivery chamber 21 in dipping pockets 28, 29, which are introduced into the housing part 24 and into the housing part 23.
  • the delivery chamber 21 is arranged axially between the sealing elements 26, 27.
  • the sealing element 26 is arranged axially between the storage area 7 and the delivery space 21.
  • the sealing element 27 is arranged axially between the storage area 8 and the delivery space 21.
  • the radial outer surfaces of the sealing elements 26, 27 form with radial circumferential surfaces of the insertion pockets 28, 29 a radial sealing gap S D , which is so large in the radial direction that the sealing elements 26, 27 in the insertion pockets 28, 29 receive no radial and / or axial guidance ,
  • the radial sealing gap S D is greater or has a greater radial extent than the bearing gap S L.
  • the immersion pockets 28, 29 each have an outer diameter which is greater than an outer diameter of the conveyor element carrier 5 of the rotor 22.
  • the FIG. 1 comprises a circularly-encircled portion X, which is enlarged in the FIG. 2 is shown.
  • the FIG. 2 shows section X of the FIG. 1 which shows a section of the second rotary pump 2, with the delivery chamber 21, the conveyor element carrier 5 formed by the drive shaft 3 and the conveyor element 4, the housing part 24, the housing part 23 and the drive shaft 3.
  • the housing part 23 and the housing part 24 is respectively an open to the delivery chamber 21 immersion pocket 28, 29 formed, in which the sealing elements 26, 27 extend.
  • the sealing elements 26, 27 are formed integrally with the conveyor element carrier 5 of the rotor 22 and the drive shaft 3. They seal the delivery chamber 21 radially.
  • the sealing elements 26, 27 have the same outer diameter as the conveying element carrier 5.
  • the sealing elements 26, 27 are formed as or by axial extensions of the conveyor element carrier 5, which extend from the delivery chamber 21 axially into the insertion pockets 28, 29.
  • the extensions have an outer diameter which is larger than an outer diameter of the drive shaft 3.
  • the extensions extend into the housing parts 23, 24 axially delimiting the delivery space 21.
  • An axial extent of the sealing elements 26, 27 is smaller than the axial extent or depth of the insertion pockets 28, 29, so that over the sealing elements 26, 27 an axial play of the drive shaft 3 can be compensated.
  • the difference in length in the axial direction between the axial depth of the insertion pockets 28, 29 and the axial extent of the sealing elements 26, 27 is greater than a maximum axial clearance of the drive shaft 3.
  • An axial extent of the radial sealing gap S D is substantially smaller than an axial extent of the radial Storage gaps S L.
  • the radial sealing gap S D can be supplied with fluid via a leakage flow which flows from the first delivery chamber 11 along the drive shaft 3 to the insertion pocket 28, 29.
  • the dipping pockets 28, 29 can be supplied with fluid via a channel, not shown, which opens into the dipping pocket 28, 29.
  • the fluid forms a barrier in the radial sealing gap S D and thus prevents fluid, in the case of gas, from escaping from the delivery chamber 21.
  • FIG. 3 shows a further longitudinal section through the pump unit, compared to FIG. 1 the pump unit with respect to a longitudinal axis L or axis of rotation of the drive shaft 3 in a rotated by a quarter turn or 90 ° view shows.
  • the region of the second rotary pump 2 is characterized by a circular cutout Y.
  • the detail Y is in the FIG. 4 to see in a magnifying glass view.
  • FIG. 3 shows nothing else than the FIG. 1 , only from a different angle.
  • the first rotary pump 1, the second rotary pump 2 and the drive shaft 3 can be seen.
  • the rotor slot 32 is formed in the area of the conveyor element carrier 5 of the second rotary pump 2 formed by the drive shaft 3, in which the conveyor element 4 extends transversely to the Can move longitudinal axis L to form together with an inner peripheral wall 25 of the delivery chamber 21 delivery cells with which the fluid from an inlet into the delivery chamber 21 to an outlet from the delivery chamber 21 can be promoted.
  • the housing part 24 and the housing part 23 of the second rotary pump 2 is ever a dipping pocket 28, 29 introduced.
  • each of the insertion pockets 28, 29 extends a sealing element 26, 27, which radially seals the delivery chamber 21 in the region of the transition from the rotor 22 into the housing part 23 and into the housing part 24.
  • the sealing element 26, 27 dimensioned smaller in the axial direction than the insertion pocket 28, 29, between the rotor 22 facing away from the axial end face of the sealing element 26, 27 and the rotor 22 facing base surface of the insertion pocket 28, 29, an axial gap S A. educated.
  • the immersion pockets 28, 29 in conjunction with the sealing elements 26, 27 together form a compensation device, with the manufacturing tolerances in the axial direction, which can be registered, for example, when pressing the counselelement wellbeings 6 of the first rotary pump 1, in the pumping unit, are compensated.
  • FIG. 4 shows a magnifying view of an area of FIG. 3 in particular comprising the rotor slot 32.
  • the rotor slot 32 has an axial extension L RS and extends axially through the conveyor element carrier 5 of the rotor 22, through both sealing elements 26, 27 into the drive shaft 3 into it.
  • the rotor slot 32 extends axially into the bearing areas 7, 8.
  • the illustrated axial extent or axial length L RS of the rotor slot 32 is greater than the axial extent or axial length L R of the rotor 22 plus the axial extent L V of the two sealing elements 26, 27 in total.
  • an axial passer stretch or pass length L P is specified, which is smaller than the axial length L RS of the rotor slot 32, but larger than the axial length L R of the rotor 22.
  • a circumferential groove 31 is further formed.
  • the circumferential groove 31 is connected to the corresponding insertion pocket 28, 29 and the corresponding storage area 7, 8.
  • the groove 31 is connected to the rotor slot 32.
  • the rotor slot 32 extends into the circumferential groove 31.
  • the groove 31 is divided into two and opens into the rotor slot 32.
  • the circumferential groove 31 is particularly in the FIGS. 5 and 6 recognizable.
  • the drive shaft 3 of the pump unit is shown uncut.
  • the housing parts 23, 24 are shown in a sectional view.
  • the FIG. 6 is the section Z from the FIG. 5 shown enlarged.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
EP19161064.1A 2018-03-06 2019-03-06 Pompe à vide à élément d'étanchéité Active EP3536961B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018105142.5A DE102018105142A1 (de) 2018-03-06 2018-03-06 Dichtelement Vakuumpumpe

Publications (4)

Publication Number Publication Date
EP3536961A2 true EP3536961A2 (fr) 2019-09-11
EP3536961A3 EP3536961A3 (fr) 2019-12-04
EP3536961B1 EP3536961B1 (fr) 2024-05-01
EP3536961C0 EP3536961C0 (fr) 2024-05-01

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US (1) US11286929B2 (fr)
EP (1) EP3536961B1 (fr)
CN (1) CN110230596B (fr)
DE (1) DE102018105142A1 (fr)

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Also Published As

Publication number Publication date
EP3536961B1 (fr) 2024-05-01
DE102018105142A1 (de) 2019-09-12
EP3536961C0 (fr) 2024-05-01
CN110230596A (zh) 2019-09-13
EP3536961A3 (fr) 2019-12-04
CN110230596B (zh) 2021-10-19
US11286929B2 (en) 2022-03-29
US20190277282A1 (en) 2019-09-12

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