EP2208890A2 - Pompe volumétrique rotative - Google Patents

Pompe volumétrique rotative Download PDF

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Publication number
EP2208890A2
EP2208890A2 EP10150861A EP10150861A EP2208890A2 EP 2208890 A2 EP2208890 A2 EP 2208890A2 EP 10150861 A EP10150861 A EP 10150861A EP 10150861 A EP10150861 A EP 10150861A EP 2208890 A2 EP2208890 A2 EP 2208890A2
Authority
EP
European Patent Office
Prior art keywords
pump
bypass
housing
rotationsverdrängerpumpe
rotationsverdrängerelement
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Withdrawn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
EP10150861A
Other languages
German (de)
English (en)
Other versions
EP2208890A3 (fr
Inventor
Klaus Lübke
Sven Borghoff
Sebastian M. Siegmund
Andreas Klomfaß
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.)
Gather Industrie GmbH
Original Assignee
Gather Industrie 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 Gather Industrie GmbH filed Critical Gather Industrie GmbH
Publication of EP2208890A2 publication Critical patent/EP2208890A2/fr
Publication of EP2208890A3 publication Critical patent/EP2208890A3/fr
Withdrawn legal-status Critical Current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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
    • 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
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F04C14/26—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
    • 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
    • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
    • 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
    • F04C2240/51—Bearings for cantilever assemblies

Definitions

  • the invention relates to a rotary displacement pump for pumping a medium, having a pump housing, a receiving chamber formed in the pump housing with an inlet region and an outlet region and at least one Rotationsverdrängerelement recorded in the receiving chamber, which is rotatably supported by at least one bearing in the pump housing and has at least one boundary surface, with which it limits at least one working space of the pump.
  • the medium In the case of rotary displacement pumps, the medium is conveyed from an inlet region into an outlet region by means of a rotational movement of a displacement element or a plurality of displacement elements through a closed working space. Apart from design-related leaks, the medium - even at a standstill of the pump - this does not flow in the opposite direction, ie from the outlet to the inlet area. Due to the compression of the medium in the working space of the pump, a considerable pressure is produced on a boundary surface of the rotary displacement element, in particular in the outlet area. Since this Rotationsverdrängerelements is rotatably mounted in the pump housing by means of a bearing or more bearings, this bearing must absorb high forces.
  • the invention is therefore based on the object to reduce a superposition by acting forces resulting total force on the Rotationsverdrängerelement or on the bearing.
  • the rotary positive displacement pump has at least one bypass, which allows a return flow of a portion of the pumped medium from the outlet to the inlet region, wherein the Rotationsverdrängerelement and / or connected to the Rotationsverdrängerelement rotary member has at least one counter surface which the bypass limited and whose Schmidt vomnormale has at least one component which is aligned opposite to the boundary surface normal of the boundary surface.
  • the pressure in the working space of the pump results in a resultant force on the rotary displacement element along the boundary surface normal. This force is - at least partially - compensated by a counterforce that exerts through the pressurized medium in the bypass on the opposite surface.
  • the bearing can be designed accordingly smaller.
  • the Rotationsverdrängerelement is mounted either directly on the bearing or on the bearing and at least one further intermediate element, in particular the rotary member in the housing.
  • the bypass is in particular a bypass running within the pump housing.
  • the medium is preferably a liquid medium.
  • the boundary surface is an axial boundary surface, which limits the working space axially.
  • the Rotationsverdrängerelement is usually supported by a bearing designed as a radial bearing rotatably mounted relative to the pump housing. Such a radial bearing is usually not suitable for receiving higher axial forces. However, such forces occur when the Rotationsverdrängerelement has an axial boundary surface.
  • the mating surface has a mating surface normal having a component aligned opposite the axial boundary surface normal of the axial mating surface. The compensation of the resulting axial forces results in a reduction of the total axial force the Rotationsverdrängerelement, connected to the Rotationsverdrängerelement rotating part and / or the bearing.
  • the mating surface is arranged opposite to the boundary surface.
  • the pressure of the medium in the working space, which acts on the boundary surface is compensated - at least partially - by the back pressure, which exerts the medium in the bypass on the counter surface, in a way that no additional tilting moment on the Rotationsverdrängerelement, the rotating part and / or the bearing works.
  • the bypass has a valve for controlling and / or regulating the flow of the back-flowing medium through the bypass.
  • the valve is used for backpressure limitation.
  • the volume flow of the medium is determined on / in the valve.
  • a variable counter pressure corresponding to the volume flow is generated on the mating surface, which is regulated as required.
  • Rotationsverdrängerelement is designed as a rotary piston.
  • a rotary displacement pump with rotary piston is in particular a rotary piston pump.
  • Rotary lobe pumps are rotary lobe pumps, rotary vane pumps, rotary lobe pumps and gear pumps.
  • one of the Rotationsverdrängerium is formed as a housing member which surrounds a trained as mecanicrotationsverdrängerelement Rotationsverdrängerelement eccentric.
  • the rotatably mounted housing element and the mecanical means together form a Verdrängeriatasatz.
  • a rotary displacement pump with such a displacement element set is, for example, an internal gear pump, also a sickle pump called, or a gerotor pump, also called gerotor pump.
  • the internal rotation displacement element designed as a toothed wheel (toothed wheel) engages with its teeth in interdental spaces (chambers) of an internal toothing of the rotatably mounted housing element.
  • the housing element is designed as a toothed ring or has a toothed ring.
  • the medium to be conveyed is carried in the spaces between the tooth gaps of the gear and the ring gear, the teeth being sealed by a crescent-shaped intermediate member.
  • the medium is conveyed by the volume-changing working space between the tooth gaps and the teeth of the two rotary displacement elements.
  • the housing element is designed as a hypotrochoid housing with n chambers and the further internal rotation displacement element n-1 has corresponding teeth for engagement in the chambers.
  • the chambers and teeth are designed so coordinated that they determine the shape and volume of the working space or the volumes of the work spaces without additional element.
  • the internal rotation displacement element has exactly one tooth less than the housing element has chambers.
  • the volume of the working space is changed by the movement of the two Rotationsverdrängeremia (the displacement element set) such that the pump sucks the medium in the inlet area, compressed on the way to the outlet area and ejects there.
  • the volume of the working space between the inlet area and the outlet area is first increased by the movement of the rotary displacement elements and then reduced again.
  • the bearing is a roller bearing or a plain bearing. If the bearing is a radial bearing, then it is a radial bearing in the form of a rolling bearing or a plain bearing for radial bearing of Rotationsverdrängerelements. Alternatively or additionally, the bearing is a thrust bearing. In particular, the thrust bearing is a combined axial / radial bearing. If the bearing is a roller bearing, it is preferably a ball bearing, roller bearing or needle roller bearings. If the bearing is designed as a sliding bearing, then this has a ring-shaped closed bearing bush or a bearing bush composed of bearing shells.
  • the rotary member is a shaft or has a shaft.
  • the Rotationsverdrängerelement is preferably rotatably supported in the housing via this shaft. It is provided in particular that the shaft forms the bypass.
  • the shaft is preferably a hollow shaft forming an axial channel.
  • the Rotationsverdrängerelement is driven by an associated drive motor Rotationsverdrängerelement.
  • the drive motor preferably drives the rotary displacement element via the rotary part, in particular the shaft.
  • a shaft is a drive shaft of the pump.
  • a coupling in particular a magnetic coupling, to be arranged between the shaft and the drive motor. Due to the interposed clutch, the output of the drive motor and the shaft are not permanently connected to each other, but rotatably connected. It is provided in particular that the coupling forms the bypass.
  • the valve has according to an advantageous embodiment of the invention, a valve-internal mechanism for valve-internal control of the pressure difference .DELTA.p of the medium in response to a pressure prevailing on the input side of the valve.
  • the pump is designed as a movement seal-free rotary displacement pump.
  • a motion seal is a dynamic seal located between two mutually moving parts.
  • the pump housing and / or the shaft made of stainless steel and / or a Hastelloy nickel-based alloy and / or titanium. These materials guarantee high mechanical strength and high corrosion resistance at temperatures from -20 ° C to + 200 ° C.
  • the bearings and / or Rotationsverdränger comprise- at least in part - from the materials Teflon and / or carbon and / or peek and / or non-seizing alloys (non-galling alloys) exist.
  • These materials are materials that can not weld with the aforementioned materials (stainless steel, Hastelloy nickel base alloy, and titanium) during operation of the pump.
  • the Fig. 1 shows the essential structure and designed as a gerotor pump 1 Rotationsverdrängerpumpe 2 with a pump housing 3 and arranged in the pump housing 3 cylindrical receiving chamber 4.
  • Rotationsverdrängerpumpe 2 with a pump housing 3 and arranged in the pump housing 3 cylindrical receiving chamber 4.
  • In the receiving chamber 4 are two rotatable mounted rotary displacement elements 5, 6, which together form a displacement element set 7.
  • the first Rotationsverdrängerelement 5 is formed as a housing member 8 which is rotatably mounted about a rotation axis 9.
  • This housing element 8 designed as a hypotrochoid housing 10 has two parts, a ring part 11 and an axially adjoining wall part 12.
  • the ring member 11 has on its inner circumference 13 seven circumferentially uniformly distributed chambers 14.
  • second Rotationsverdrängerelement 6 is arranged, which has six teeth 17 on its outer circumference 16.
  • the mecanicrotationsverdrängerelement 15 is rotatably mounted about an axis of rotation 18 which does not coincide with the axis of rotation 9 of the housing member 8.
  • the axes of rotation 9 and 18 are spaced apart such that a part of the teeth 17 engages in a part of the chamber 14 and form working spaces 19 between the other teeth 17 and chambers 14.
  • Each of the working spaces 19 is bounded by a part of the inner circumference 13 of the annular part 11 belonging to the housing element 8, a part of the outer circumference 16 of the inner rotary displacement element 15 and a limiting surface 21 of the housing part 8 belonging to the housing part 8.
  • a respective part of the inner circumference 13 and the outer circumference 16 thus likewise forms a delimiting surface 21.
  • a further second axial limiting surface (not shown) opposite the axial limiting surface 20 of the wall part 12 is formed by a pump cover 22.
  • an inlet channel 23 and an outlet channel 24 of the pump 2 are connected via an inlet kidney 25 to an inlet region 26 of the receiving chamber 4.
  • An outlet region 27 of the receiving chamber 4 lying opposite the inlet region 26 is connected to the outlet channel 24 via an outlet kidney 28 formed in the pump cover.
  • the rotary displacement pump 2 extends from a drive-side first end 31 along its longitudinal axis 32 to a pump-side second end 33.
  • the longitudinal axis 32 is at the same time the axis of rotation 9 of the housing element 8 formed as the first Rotationsverdrängerelements 5.
  • the wall portion 12 of the housing member 8 is integrally connected to a shaft 34 formed as a rotary member 35.
  • the shaft 34 extends from the wall portion 12 of the housing member 8 to a clutch formed as a magnetic coupling 36.
  • the clutch 37 is located in a fastened with mounting screws 38 on the pump housing 3 pump carrier housing 39.
  • the shaft 34 is about two with respect to the axis of rotation 9 axially spaced bearings 40, 41 rotatably mounted in the pump housing 3.
  • the bearings 40, 41 are radial bearings.
  • the first bearing 40 is designed as a two-part angular contact ball bearing 42
  • the second bearing 41 is formed as a cylindrical roller bearing 43.
  • the magnetic coupling 36 consists of an outer magnet 44, which surrounds an inner magnet 45 ideally.
  • the inner magnet 45 is rotatably connected via an associated hub 46 (magnetic hub) and a fastening screw 47 with the shaft 34.
  • the hub 46 is centered by means of a centering pin 48 arranged between the hub 46 and the shaft 34.
  • cap 50 is arranged between the outer magnet 44 and the inner magnet 45 .
  • the cap 50 separates a pump interior 51 of the pump housing 3, which also includes the receiving chamber 4, from an interior 52 of the pump carrier housing 39, in which the outer magnet 44 is located.
  • the outer magnet 44 is rotatably connected to a magnetic carrier 53, which has a receptacle 54 for the output shaft of a drive motor, not shown.
  • the drive motor is preferably an electric motor.
  • the shaft 34 is driven by the drive motor, the shaft 34 is a drive shaft of the driven rotary displacement element 5.
  • a bypass 59 which connects the outlet region 27 to the inlet region 26, runs in the pump interior 51 and thus permits a return of a portion of the medium from the outlet region 27 into the inlet region 26, independently of the delivery through the working chambers 19.
  • the bypass 59 allows a volume flow of the medium along the following bypass path:
  • the refluxing medium from the outlet portion 27 of the receiving chamber 4 passes through the cylindrical roller bearing 55 associated with the mecanicrotationsverdrängerelement 15 in a running within the shaft 34 channel 60 and through the Subsequently, the medium flows along the inner surface of the cap 50 back to the outer region 62 of the shaft 34, passes through an axial fixing 63 and arranged in the pump interior 51 two bearings 40, 41.
  • the first rotational displacement element 5 delimits the bypass 59, its counterface normal (arrow 65) having a component which is oriented opposite to the boundary surface normal (arrow 66) of the boundary surface 21.
  • the boundary surface 21 is an axial boundary surface 20, which limits the working spaces 19 axially. Furthermore, in this embodiment, the mating surface 64 is disposed opposite to the boundary surface 21.
  • valve 67 controllable and / or adjustable.
  • This valve 67 is attached to the outer surface of the pump cover 22. It is fluidically arranged, for example, in the bypass 59 between the outlet region 27 and the leakage channel and serves to counter-pressure limiting.
  • the valve 67 can be actuated externally and preferably has a sensor for determining a volume flow through the valve 67. By determining the volume flow at the valve 67, a variable backpressure can be generated, which can be regulated as required.
  • valve 67 has a valve-internal mechanism which controls an in-valve control of the pressure difference ⁇ p of the medium as a function of the pressure prevailing on the input side of the valve 67.
  • the forces resulting from the pressure difference ⁇ p between the inlet region 26 and the outlet region 27 can also be adjusted, in particular reduced, by setting this pressure difference ⁇ p by means of the valve 67 via the bypass 59.
  • the axial fixing 63 serves in one embodiment simultaneously as a diaphragm for reducing pressure and thus also the force reduction between the interior of the cap 50 and the pump interior 51 in the outer region 62 of the shaft 34th
  • the bypass 59 of the Fig. 2 shown pump 2 extends in a closed region of the pump 2, which extends in the direction of the longitudinal axis 32 from the pump cover 22 to the inner magnet 45 of the magnetic coupling 36 surrounding cap 50.
  • the power transmission to the drive motor is effected by magnetic frictional connection between the inner magnet 45 within the closed area and the outside of this closed area arranged outer magnet 44 of the magnetic coupling 36.
  • From the closed area is no rotatable relative to the pump housing 3 rotatably mounted part 35, such as the shaft 34, led out. This makes it superfluous to seal off the sealed area from its surroundings by means of a dynamic seal (moving seal), in particular a rotary seal, such as a shaft seal circumferentially surrounding the rotary part 35.
  • a dynamic seal moving seal
  • a rotary seal such as a shaft seal circumferentially surrounding the rotary part 35.
  • the rotational displacement pump 2 is thus preferably a motion seal-free rotary displacement pump 68.
  • a motion seal-free rotary displacement pump 68 is usable for maximum pressure of the medium at the inlet portion 26 and / or at the outlet portion 27, which is in a range above 20 bar, preferably in one Range above 50 bar.
  • the bypass 59 also serves to cool the aforementioned components circulated and flowed through by it, ie the bearings 40, 41, 56, the shaft 34, the coupling 37, the pump interior 51 and the rotary displacement elements 5, 6 If the medium has sufficient lubrication properties, then the bypass 59 continues to serve for the lubrication of these components of the pump 2.
  • the pump 2 is a pump 2 for delivering non-lubricating and / or corrosive media.
  • the pump housing 3 and / or the shaft 34 consist, preferably of stainless steel (material No. 1.4404 or 1.4571) and / or Hastelloy (C-276, material No. 2.4819) and / or titanium (grade 2, material no 3.7035).
  • the bearings 40, 41, 56 and / or the Rotationsverdrängerieri 5, 6 are - at least in part - made of the materials Teflon and / or carbon and / or peek and / or non-seizing alloys (Non Galling Alloys).
  • the non-seizing alloys do not weld with the stainless steel, Hastelloy, or titanium pump housing 3 and / or shaft 34 during operation of the pump.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)
EP10150861A 2009-01-16 2010-01-15 Pompe volumétrique rotative Withdrawn EP2208890A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202009000690U DE202009000690U1 (de) 2009-01-16 2009-01-16 Rotationsverdrängerpumpe

Publications (2)

Publication Number Publication Date
EP2208890A2 true EP2208890A2 (fr) 2010-07-21
EP2208890A3 EP2208890A3 (fr) 2011-11-30

Family

ID=40531029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10150861A Withdrawn EP2208890A3 (fr) 2009-01-16 2010-01-15 Pompe volumétrique rotative

Country Status (3)

Country Link
US (1) US20100183454A1 (fr)
EP (1) EP2208890A3 (fr)
DE (1) DE202009000690U1 (fr)

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DE102009028154A1 (de) * 2009-07-31 2011-02-03 Robert Bosch Gmbh Zahnradpumpe
JP5889614B2 (ja) * 2011-11-29 2016-03-22 株式会社トクヤマデンタル ペースト練和装置
US9624929B2 (en) * 2012-12-21 2017-04-18 Lg Innotek Co., Ltd. Electric pump
DE102013203331A1 (de) * 2013-02-28 2014-08-28 Zf Friedrichshafen Ag Rotationsdämpfer für ein Fahrzeug
US10087758B2 (en) 2013-06-05 2018-10-02 Rotoliptic Technologies Incorporated Rotary machine
JP2015108327A (ja) * 2013-12-04 2015-06-11 株式会社神戸製鋼所 冷媒ポンプ及び当該冷媒ポンプを用いたバイナリ発電システム
JP6271992B2 (ja) 2013-12-13 2018-01-31 Ntn株式会社 内接歯車ポンプ
JP6927223B2 (ja) * 2016-08-09 2021-08-25 日本電産株式会社 駆動装置
IT201600125212A1 (it) 2016-12-12 2018-06-12 Bosch Gmbh Robert Pompa elettrica a ingranaggi
EP3850189A4 (fr) 2018-09-11 2022-06-15 Rotoliptic Technologies Incorporated Étanchéité dans des machines rotatives trochoïdales hélicoïdales
US11815094B2 (en) 2020-03-10 2023-11-14 Rotoliptic Technologies Incorporated Fixed-eccentricity helical trochoidal rotary machines
US11802558B2 (en) 2020-12-30 2023-10-31 Rotoliptic Technologies Incorporated Axial load in helical trochoidal rotary machines

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Also Published As

Publication number Publication date
DE202009000690U1 (de) 2009-04-09
EP2208890A3 (fr) 2011-11-30
US20100183454A1 (en) 2010-07-22

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