EP2556256B1 - Pompe à pistons rotatifs et procédé de fonctionnement d'une pompe à pistons rotatifs - Google Patents

Pompe à pistons rotatifs et procédé de fonctionnement d'une pompe à pistons rotatifs Download PDF

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Publication number
EP2556256B1
EP2556256B1 EP11729047.8A EP11729047A EP2556256B1 EP 2556256 B1 EP2556256 B1 EP 2556256B1 EP 11729047 A EP11729047 A EP 11729047A EP 2556256 B1 EP2556256 B1 EP 2556256B1
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EP
European Patent Office
Prior art keywords
rotary
drive
driven
pump
elastic element
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.)
Active
Application number
EP11729047.8A
Other languages
German (de)
English (en)
Other versions
EP2556256A2 (fr
Inventor
Hans Jürgen LINDE
Bernhard Murrenhoff
Robert Kurz
Reinhard Denk
Josef Strassl
Thomas Böhme
Hisham Kamal
Stefan Weigl
Roger Willis
Stefan Kern
Johann Kreidl
Gunter Herr
Franz Kneidl
Mikael Tekneyan
Erwin Weber
Marcel Verhoeven
Mathias Gradl
Udo Enderle
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.)
Netzsch Pumpen and Systeme GmbH
Original Assignee
Netzsch Pumpen and Systeme 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.)
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Publication date
Application filed by Netzsch Pumpen and Systeme GmbH filed Critical Netzsch Pumpen and Systeme GmbH
Publication of EP2556256A2 publication Critical patent/EP2556256A2/fr
Application granted granted Critical
Publication of EP2556256B1 publication Critical patent/EP2556256B1/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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C17/00—Arrangements for drive of co-operating members, e.g. for rotary piston and casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C17/00—Arrangements for drive of co-operating members, e.g. for rotary piston and casing
    • F01C17/02—Arrangements for drive of co-operating members, e.g. for rotary piston and casing of toothed-gearing type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/008—Driving elements, brakes, couplings, transmissions specially adapted for rotary or oscillating-piston machines or engines
    • 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
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/126—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
    • 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
    • F04C2230/90—Improving properties of machine parts
    • F04C2230/91—Coating
    • 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
    • F04C2240/40—Electric motor
    • F04C2240/402—Plurality of electronically synchronised motors

Definitions

  • the present invention relates to a method for operating a rotary lobe pump.
  • the rotary lobe pump to be operated with the method according to the invention is equipped with at least one motor which drives at least two rotary lobes rotating in relation to one another.
  • the rotary pistons move in a pump housing.
  • the at least two rotary pistons are arranged on a first output shaft and a second output shaft.
  • the two output shafts are synchronized and driven in such a way that the at least two rotary pistons are in operative connection with one another and form an active pair.
  • German patent application DE 38 25 372 A1 describes an engine with two ring cylinders arranged in one plane, in which rotary pistons are arranged.
  • the revolving pistons are attached to the periphery of a rotor disk that is rotationally fixed on a shaft.
  • the rotor disks have a corresponding slot in the periphery in which the respective ring cylinders pass, the two rotating pistons meshing with one another.
  • the task of the engine is to set the rotating pistons in rotation by means of combustion, a suitable substance, and to drive the shafts via them.
  • the rotating pistons can rotate in the same direction as well as in opposite directions.
  • German patent DE 10 2005 062 892 B2 discloses a rotary piston machine used as an internal combustion engine or as a work machine.
  • the two diametrically arranged rotary pistons create periodically variable working chambers in a ring cylinder housing.
  • the rotary pistons are connected in a torsionally rigid manner by means of shafts that are pushed one inside the other so that the shafts act individually on a common output shaft via an envelope drive system with elliptical transmission disks.
  • the enveloping drive can be constructed with a toothed belt, toothed chain or chain.
  • the GB 2 207 190 A describes an oil-free vacuum pump, the rotors being toothed.
  • An elastic belt is used as the driving belt, which consists of a woven or metal reinforced rubber or polymer. This is selected in such a way that maximum engagement and power transmission without slippage with minimal expansion, whether under tensile stress or after extended use, can be guaranteed.
  • the EP 1 927 758 A1 describes driving the rotors by means of a gear with gearwheels, a belt additionally being guided over deflection rollers in order to support the synchronization. There is a double synchronization, on the one hand via the gears and on the other hand via the belt. The torque is transmitted between the rotors in two ways, via the deflection rollers and via the synchronous gear.
  • the GB 2 176 848 A describes a compressor in which the rotational force is magnetically applied directly to the working rotor by means of a static seal and not by the gearwheels, which are mainly used to transmit dynamic loads.
  • the DE 197 11 510 A1 describes a screw compressor which comprises a first and a second screw compressor unit.
  • the screw compressor comprises a drive unit and the belt drive coupling the drive unit with the screw compressor units.
  • the belt drive comprises a first and a second pulley designed for torque transmission and a drive pulley connected to the drive shaft of the drive unit for torque transmission.
  • a transmission belt is provided which is in a transmission plane over the first and the second pulley and runs over the drive pulley, the power transmitted by the belt transmission being greater than 10 kW.
  • the DE 103 34 481 A1 describes a spindle vacuum pump with a pre-tensioned belt drive.
  • a closed belt drive from a motor pulley simultaneously drives the two equally sized rotor-fixed belt wheels via a change of curvature in the belt drive.
  • the JP 6 185 483 A1 describes a device for connecting the ends of webs lying on one another or with multiple surfaces, in particular windable metal strips.
  • the WO 2009/076689 A2 describes a drive with at least two intermeshing toothing elements.
  • At least one toothed element comprises a base body, which has teeth along a circumference, which at least partially have an abradable polymer coating on a surface.
  • the invention has for its object to provide a method with which a rotary lobe pump can be operated trouble-free and economically.
  • the rotary lobe pump to be operated is provided with at least one motor and with at least two rotary lobes rotating in relation to one another.
  • the at least two rotary pistons are arranged in a pump housing. Furthermore, the at least two rotary pistons are arranged on a first output shaft and a second output shaft.
  • the first output shaft and the second output shaft are synchronized and driven with one another in such a way that the at least two rotary pistons mesh with one another. This is achieved in that the output shafts can be driven and synchronized via an elastic element. Under the intermeshing is to be understood that the rotary lobes form an interrelated pair of interactions.
  • the design of the rotary lobe pump with an elastic element has considerable advantages over the prior art. Firstly, the rotary lobes are secured against clogging by jamming solid bodies in the rotary lobe pump, and secondly, the rotary lobe pump can be operated oil-free. This high permeability to solids results from the fact that the elastic element can give way in the event of blockages in the area of the rotary lobes. By using the elastic element, there is no need for a conventional gear, which has to run in oil. Furthermore, by simultaneously driving and synchronizing the rotary lobes, the power density of the rotary lobe pump is increased and, at the same time, the weight is reduced.
  • the elastic element is an endless, flexible element.
  • This endless, flexible element can be a double toothed belt, a chain or a link belt.
  • Lubrication must be used when using chains or link belts. The effort for the lubrication of the chains or link belts is significantly less than is the case with conventional rotary lobe pumps driven by gears.
  • the double toothed belt can have different profiles. It is important that the double toothed belt has a certain flexibility. This flexibility makes it possible to briefly compensate for the currently occurring synchronous rotation of the rotary lobes by stretching the double toothed belt in the event of a blockage.
  • the teeth of the double toothed belt are always designed in such a way that they form optimal active pairs with the teeth of the gear wheels in the system and thus optimally transmit the forces from the drive shaft to the rotary pistons.
  • the teeth of the double toothed belt should be designed such that they represent the weakest link in the active system when the rotary lobes are completely blocked. This would, for example, rub the teeth at the point of maximum stress.
  • the endless, flexible element has a free span length between a first driven wheel and a second driven wheel.
  • This free span length represents a buffer area.
  • the free span length ensures that the rotary lobe pump is free from solids.
  • the larger the free span length the more the rotary lobes can turn against each other.
  • This twisting of the Rotary lobes to each other are closed after a maximum of one complete turn of the rotary lobes.
  • the fact that the rotation is canceled after a maximum of one complete revolution ensures that the rotary lobe pump functions correctly.
  • This means that the length of the free run is directly dependent on the size of the solid particles in the medium to be pumped.
  • the larger the solids in the medium the greater the free span length. Of course, this is only possible up to a certain solid size.
  • the solids ability of the rotary lobe pump continues to depend on the rotary lobe and its surface condition.
  • the length of the free run can be adjusted by the radii of the first driven wheel and the second driven wheel.
  • the larger the radii the smaller the free span length.
  • the radii of the two driven wheels must always be the same size, otherwise there is no synchronism of the rotary pistons.
  • the distance between the output shafts depends on the design of the rotary pistons.
  • the larger the rotary lobes the greater the distance between the output shafts. If the distance between the output shafts is large, the active system can also have a large free strand length and thus a high solids flow.
  • the free span length also influences the synchronization accuracy. The shorter the length of the free run, the more precisely the rotary lobe pump can be synchronized. This also applies to the possible longitudinal expansion of the free run.
  • the elasticity is ensured by plastic-coated gears.
  • the plastic coating is designed in such a way that it allows the rotary pistons to be offset from one another.
  • the motor is mounted over the actual pump housing.
  • This combination of motor and pump is commonly referred to as "piggy back".
  • This embodiment has the advantage that the center of gravity of the engine and the rotary lobe pump lie in one axis. Furthermore, the "Piggy Back" enables the rotary lobe pump to be integrated directly and with a short design into a piping system.
  • the elastic element enables the rotary lobe pump to be driven by several motors. It is therefore possible, for example, to choose two smaller motors to better distribute the weight of the entire active system. For example, motors that run exactly synchronously are used to drive the rotary lobe pump.
  • a device for maintaining the element tension is assigned to the endless, flexible element.
  • At least one secondary machine can be driven with the device for maintaining the element tension.
  • a secondary machine can be, for example, another pump or a pre-shredder.
  • a secondary pump can be used, for example, to add lubricant or to add condensers to the medium to be pumped.
  • Devices for tensioning toothed belts and / or chains are known from the prior art. It is also known that there are a large number of secondary devices which can be assigned to a rotary lobe pump. The information given in advance does not represent a final restriction of the protection area.
  • the first output shaft and the second output shaft are driven and synchronized by at least one motor via an elastic element.
  • An endless, flexible element or at least one elastically coated gear can be used for the elastic element.
  • the rotary lobe pump is driven by at least two motors.
  • the endless, flexible element is held in tension by a device.
  • at least one secondary machine can be driven with this device.
  • Figure 6 shows schematically the course of the endless, flexible element with free strand length between the driven wheels.
  • FIG 1 shows schematically the structure of a rotary lobe pump 20 to be operated with the method according to the invention with a drive and synchronization device.
  • a motor 22 is arranged above a pump housing 26.
  • the motor 22 is connected to a drive shaft 23 which moves a drive wheel 24.
  • An elastic element 44 is driven in rotation via the drive wheel 24.
  • a first driven wheel 42 and a second driven wheel 43 are driven via the elastic element 44.
  • the first driven wheel 42 is connected to a first driven shaft 40 and the second driven wheel 43 is positively and / or non-positively connected to a second driven shaft 41. Via the first output shaft 40 and the second output shaft 41, the rotary pistons (see Figure 2 ) driven.
  • a rotary lobe pump 20 with an open pump housing 26 is shown schematically.
  • the motor 22 is mounted above the pump housing 26.
  • Of the drive and synchronization device 25 is in the Figure 2 only one mounting plate 21 can be seen.
  • the rotary pistons 32 are located in the pump housing 26.
  • a rotary piston 32 is driven by the first output shaft 40 and the second rotary piston 32 by the second output shaft 41.
  • FIG 3 shows the schematic structure of a drive and synchronization device 25 with a separate tensioning device 34.
  • the drive wheel 24 Via the drive shaft 23, the drive wheel 24 is driven, which transmits the rotational forces of the drive shaft 23 to the elastic element 44.
  • the elastic element 44 a double toothed belt, drives the first driven wheel 42 and the second driven wheel 43, the first driven wheel 42 rotating the first driven shaft 40 and the second driven wheel 43 the second driven shaft 41. So that the elastic element 44 always has the correct tension, it is held in tension by the tensioning device 34.
  • the strength of the preload can be adjusted via a tensioning element 36.
  • the first output shaft 40 and the second output shaft 41 have to rotate in opposite directions, the first output gear 42 is driven from the outside of the elastic element 44 and the second output gear 43 from the inside of the elastic element 44. This change of engagement takes place in the area 48 between the drive wheels 42 and 43.
  • a drive and synchronization device 25 is shown schematically without a separate tensioning device.
  • the elastic element 44 is guided directly from the drive wheel 24 to the first driven wheel 42. From there it is transferred to the second driven wheel 43 via the area 48.
  • the motor 22 with the drive shaft 23 and the drive wheel 24 is moved in this exemplary embodiment. With the tensioning element 36, the motor 22 is moved away from the drive wheels 42 and 43 until the necessary pre-tensioning of the elastic element 44 is present.
  • FIGS. 5a to 5c show various examples of the arrangement of the motor 22 to the rotary lobe pump 20.
  • a motor 22 which is offset laterally to the drive and synchronization device 25 is shown schematically.
  • a tensioning roller 38 which holds the elastic element 44 under pre-tension. Because the motor 22 is laterally offset, the length of the elastic element 44 increases, which means that the use of a tensioning device 34 is essential.
  • FIG. 5b A drive and synchronization device 25 for a rotary lobe pump is shown, in which the motor 22 is not arranged in close proximity to the drive and synchronization device 25.
  • This example is intended to show that it is possible, using an elastic element 44, to install the motor 22 further away from the rotary lobe pump.
  • a tensioning device 34 is necessary in order to keep the elastic element 44 in tension.
  • Figure 5c shows schematically how a rotary lobe pump (not shown here) can be designed, which is driven by two motors 22.
  • two motors 22 are arranged above the drive and synchronization device 25.
  • Each of the two motors 22 has a separate drive shaft 23 and a drive wheel 24 assigned to the drive shaft 23.
  • the elastic element 44 runs over the two drive wheels 24 and is guided from there around the first driven wheel 42 and the second driven wheel 43.
  • the Bias for the elastic element 44 is generated by one of the Motors 22 is movably connected to the drive and synchronization device 25. The movable motor 22 is shifted until the elastic element 44 has the required tension.
  • the course of the endless, flexible element 44, with free span length Xi, between the driven wheels 42 and 43 is shown schematically.
  • the free span length Xi is determined by the configuration of the effective radii Ri of the driven wheels 42 and 43.
  • Another possibility to vary the length of the free run Xi is to change a distance A between the first output shaft 40 and the second output shaft 41.
  • the shape described is shown because of the small effective radii Ri of the driven wheels 42 and 43, a relatively large free span length Xi. This results in a relatively large possibility of rotation ⁇ of the driven wheels.

Claims (3)

  1. Procédé opérationnel d'une pompe à piston rotatif (20) destinée à un milieu contenant des particules solides, la pompe à piston rotatif comprenant au moins un moteur (22) pourvu d'au moins deux pistons rotatifs (32) se déplaçant en rotation l'un contre l'autre et d'un corps de pompe (26), les au moins deux pistons rotatifs (32) étant placés sur un premier arbre de sortie (40) et sur un second arbre de sortie (41) et le premier arbre de sortie (40) et le second arbre de sortie (41) étant synchronisés et entraînés de telle sorte que les au moins deux pistons rotatifs (32) s'engrènent l'un dans l'autre, les pistons rotatifs (32) étant assemblés l'un à l'autre du côté entraînement par l'intermédiaire d'au moins un élément élastique (44), l'au moins un élément élastique (44) étant un élément (44) sans fin souple, lequel entre une première roue menée (42) et une seconde roue menée (43) dispose d'une longueur de brin libre, caractérisé en ce que la longueur du brin libre (Xi) est réglée par les rayons (Ri) de la première roue menée (42) et de la seconde roue menée (43) ou en ce que la longueur du brin libre (Xi) est réglable par un écart entre le premier arbre de sortie (40) et le second arbre de sortie (41) ou en ce que le niveau de la précision de synchronisation est réglable au moyen d'une longueur libre d'un brin (Xi) entre la première roue menée (42) et la seconde roue menée (43).
  2. Procédé selon la revendication 1, la pompe à piston rotatif (20) étant entraînée par au moins deux moteurs (22).
  3. Procédé selon l'une quelconque des revendications 1 ou 2, l'élément sans fin souple étant maintenu en tension par un dispositif (34) et à l'aide dudit dispositif (34) étant entraînée au moins une machine secondaire.
EP11729047.8A 2010-04-08 2011-04-06 Pompe à pistons rotatifs et procédé de fonctionnement d'une pompe à pistons rotatifs Active EP2556256B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010014218.2A DE102010014218B4 (de) 2010-04-08 2010-04-08 Drehkolbenpumpe und Verfahren zum Betreiben einer Drehkolbenpumpe
PCT/DE2011/000373 WO2011124213A2 (fr) 2010-04-08 2011-04-06 Pompe à pistons rotatifs et procédé de fonctionnement d'une pompe à pistons rotatifs

Publications (2)

Publication Number Publication Date
EP2556256A2 EP2556256A2 (fr) 2013-02-13
EP2556256B1 true EP2556256B1 (fr) 2020-01-15

Family

ID=44581851

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11729047.8A Active EP2556256B1 (fr) 2010-04-08 2011-04-06 Pompe à pistons rotatifs et procédé de fonctionnement d'une pompe à pistons rotatifs

Country Status (12)

Country Link
US (1) US9028233B2 (fr)
EP (1) EP2556256B1 (fr)
CN (1) CN103119301B (fr)
AU (1) AU2011238240B2 (fr)
BR (1) BR112012025726B1 (fr)
CL (1) CL2012002795A1 (fr)
DE (1) DE102010014218B4 (fr)
MX (1) MX2012011670A (fr)
MY (1) MY169995A (fr)
SG (1) SG184424A1 (fr)
WO (1) WO2011124213A2 (fr)
ZA (1) ZA201207383B (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US20230143219A1 (en) * 2020-05-11 2023-05-11 Ateliers Busch Sa Dry vacuum pump

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CN203783890U (zh) * 2014-04-11 2014-08-20 陈洪亮 双转子回转式容积泵
DE102014117166B4 (de) * 2014-11-24 2016-07-07 Netzsch Pumpen & Systeme Gmbh Drehkolbenpumpe, verfahren zur fixierung von drehkolben einer drehkolbenpumpe und verfahren zur demontage von drehkolben einer drehkolbenpumpe
TWM531986U (zh) * 2016-05-18 2016-11-11 復盛股份有限公司 渦卷式空壓機

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US20230143219A1 (en) * 2020-05-11 2023-05-11 Ateliers Busch Sa Dry vacuum pump

Also Published As

Publication number Publication date
BR112012025726A2 (pt) 2016-07-19
BR112012025726B1 (pt) 2020-11-24
US20130094985A1 (en) 2013-04-18
WO2011124213A3 (fr) 2013-03-21
SG184424A1 (en) 2012-11-29
EP2556256A2 (fr) 2013-02-13
CN103119301B (zh) 2016-08-03
ZA201207383B (en) 2013-06-26
MY169995A (en) 2019-06-19
MX2012011670A (es) 2012-12-17
WO2011124213A2 (fr) 2011-10-13
CL2012002795A1 (es) 2013-03-01
AU2011238240B2 (en) 2015-07-16
CN103119301A (zh) 2013-05-22
US9028233B2 (en) 2015-05-12
DE102010014218A1 (de) 2011-10-13
DE102010014218B4 (de) 2018-09-13

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