EP0753665A1 - Gear pump - Google Patents

Gear pump Download PDF

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Publication number
EP0753665A1
EP0753665A1 EP95114623A EP95114623A EP0753665A1 EP 0753665 A1 EP0753665 A1 EP 0753665A1 EP 95114623 A EP95114623 A EP 95114623A EP 95114623 A EP95114623 A EP 95114623A EP 0753665 A1 EP0753665 A1 EP 0753665A1
Authority
EP
European Patent Office
Prior art keywords
pump
gear pump
particular according
collar
suction side
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
EP95114623A
Other languages
German (de)
French (fr)
Other versions
EP0753665B1 (en
Inventor
Roger Dr. Ing. Stehr
Peter Dr. Sc. Techn. Blume
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.)
Maag Pump Systems AG
Original Assignee
Maag Pump Systems AG
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 Maag Pump Systems AG filed Critical Maag Pump Systems AG
Priority to EP95114623A priority Critical patent/EP0753665B1/en
Priority to DE59509082T priority patent/DE59509082D1/en
Priority to TW087216659U priority patent/TW454822U/en
Priority to US08/707,253 priority patent/US5772417A/en
Priority to KR1019960038189A priority patent/KR970016133A/en
Priority to JP8238124A priority patent/JPH09166093A/en
Publication of EP0753665A1 publication Critical patent/EP0753665A1/en
Application granted granted Critical
Publication of EP0753665B1 publication Critical patent/EP0753665B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0096—Heating; Cooling
    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/001—Pumps for particular liquids
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49236—Fluid pump or compressor making
    • Y10T29/49242—Screw or gear type, e.g., Moineau type

Definitions

  • the present invention relates to a gear pump for conveying fluid media, such as in particular viscous media, and a delivery pipe with a gear pump.
  • Gear pumps for the conveyance of fluid media are well known and have been described several times, for example in DE-19 41 673 and DE-24 36 222.
  • a gear pump with a large-volume pump inlet that is particularly suitable for discharge from reactors.
  • the pump housings are designed as double-walled, so-called “fully jacketed” constructions.
  • the circumferential, closed chamber volume allows excellent temperature control of the gear pump, which is particularly important in the case of polymer discharge units in polymer synthesis. Steam or heat transfer oils are generally used as temperature control media.
  • heating media are fed in, as shown, for example, in DE-24 36 222, via two or more temperature control connection flanges of the pump housing.
  • Both pump types described above also have a mounting or connection flange on both the suction and pressure side.
  • the pumps must be able to be connected in a vacuum-tight manner to the upstream and downstream components, such as, for example, the synthesis reactor, subsequent delivery lines, pelletizing systems, etc. via these flanges.
  • a gear pump for conveying fluid media, in particular viscous media which has tube-like or collar-like sections on the suction side and / or pressure side or on the delivery side in order to weldably connect the pump to further upstream or downstream system components.
  • a gear pump of the type described at the outset is proposed, which has a double-walled pump housing with an arrangement, in order to be able to heat or cool the pump.
  • the arrangement is suitable for flowing through or passing through fluid heating or tempering media, such as, in particular, steam or heat transfer oils, for example.
  • the gear pump proposed according to the invention preferably has in the area of the weldable section (s) one or more connection opening (s) with the space formed by the double wall of the housing, provided for the supply or discharge of the heating or tempering medium.
  • the section (s) are designed on the suction and / or pressure side of the gear pump in the form of a tubular collar, suitable for firmly fitting a correspondingly dimensioned tubular opening of a component connected thereto, such as a pipeline, preferably butt-welded Connect pump.
  • another tube-like collar is arranged on the suction and / or pressure side of the gear pump, also provided in order to firmly connect another tube, which is coaxially surrounding a tube, preferably butt welded, to the pump, the space formed between the two pipes may optionally serve to promote the heating or tempering medium.
  • the one tubular collar on the pressure side or on the delivery side is preferably provided with a greater wall thickness than the one tubular collar on the suction side.
  • the great advantage of the gear pump proposed according to the invention is that the gear pump is connected in an absolutely gas-tight manner to an upstream or downstream system component during operation or is installed in a corresponding pipeline.
  • gear pump is connected in an absolutely gas-tight manner to an upstream or downstream system component during operation or is installed in a corresponding pipeline.
  • a further advantage of the gear pump proposed according to the invention is that there are no lateral connections to be provided on the gear pump for the supply or discharge of heating or tempering media.
  • pumps do not need to be removed for maintenance or revision.
  • a gear pump is described in section according to the prior art, having a double-walled housing.
  • the housing 1 of the gear pump contains the vertical inlet opening 3, which is formed by a hollow cone.
  • the medium to be conveyed is introduced into the gear pump and conveyed through the two toothed shafts 4 and 5 and pressed against the outlet opening 9.
  • the medium to be conveyed is fed through the outlet opening 9 in the direction of arrow 10 'to a downstream component.
  • the gear pump has a suction side a larger opening than on the pressure side at the outlet opening.
  • the housing 1 is, as can be clearly seen from FIG. 1, double-walled, having the outer housing halves 14 and 15 and an intermediate space 13, which results from the double-walled design.
  • the intermediate space or the channels 13 form the heating jacket of the pump, in order to prevent, for example in the case of a gear pump connected downstream of a polymer synthesis, that conveying is made difficult or practically impossible by rapid cooling of the highly viscous polymer.
  • the gear pump shown in FIG. 1 from the prior art has a connecting flange 18 or 18 'on the suction side as well as on the pressure side in order to connect the pump to upstream or downstream components.
  • FIG. 2 shows a gear pump according to the invention in section, analog parts with reference to the gear pump from FIG. 1 being designated with the same reference numbers.
  • the pump has a housing 1 and a vertical inlet opening 3 through which the medium to be pumped is introduced in the direction of the arrow 10. Toothed shafts 4 and 5 drive the medium against the outlet opening 9, where the medium leaves the pump in the direction of the arrow 10 'in the direction of a downstream component.
  • the outer housing has the two halves 14 and 15 and, as a result of the double wall, spaces or channels 13 which are provided for the temperature control of the gear pump.
  • the gear pump shown in FIG. 2 now has two tube-like sections on both the suction side and the pressure side Collar connections 21, 26, 31 and 36, which are butt welded, for example, to the connection flanges 18 and 18 'of the pump via welds 22, 28, 32 and 38, respectively.
  • the two tubular collars 21 and 31 form the inner connections, which are intended to be connected to corresponding connections of upstream and downstream components for guiding the medium to be conveyed.
  • the connection of, for example, pipelines upstream and downstream to the pump can also be butt welded to the two pipe sections 21 and 31, since these each preferably have conical beveled connection parts 24 and 34, respectively.
  • the two further pipe sections 26 and 36 which are arranged coaxially and outside of the pipe sections 21 and 31 are provided in order to be preferably butt-welded to outer casing pipes which are optionally arranged coaxially to connecting pipes, with a temperature control medium in the casing space formed by the two coaxial connecting pipe lines the gear pump can be supplied or removed.
  • the collar-like tube section 31 is designed to be significantly stronger than the corresponding tube section 21 on the suction side. This is related to the fact that the pressure or pressure side has significantly higher pressure ratios, for example 250 bar or more, while there is atmospheric pressure or a negative pressure on the suction side which permits less strong pipelines.
  • the gear pump shown according to the invention is particularly suitable as a discharge unit in polymer synthesis, where highly viscous polymer melt has to be discharged from synthesis reactors and where large volumes are generally to be conveyed.
  • discharge units in particular, it is essential that no atmosphere enters on the suction side.
  • these discharge units are preferably heatable so that highly viscous materials do not become even more viscous as a result of cooling.
  • the gear pump according to the invention shown in FIG. 2 is only an example that can be modified, supplemented and modified in any way. So it is of course irrelevant how the welding sections arranged on the suction and pressure sides are designed. It is also not absolutely necessary for the upstream and downstream components to be connected by butt welding; any other welding techniques are of course also included in the spirit of the present invention.

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

Abstract

The pump has collar-like sections (21,26,31,36) provided on the suction side and/or on the pressure and conveyance side by means of which the pump can be welded gas-tight with other components. An assembly (13) is provided in or on the pump housing to heat the pump and the fluid passes through this assembly. The pump has a partially double-walled housing (1) for forming the interspace (13) through which the fluid passes. One or more connecting openings (16) with the interspace are provided in the welding section areas so that the heating medium can be supplied and discharged.

Description

Die vorliegende Erfindung betrifft eine Zahnradpumpe zur Förderung von fluiden Medien, wie insbesondere viskosen Medien, sowie eine Förderrohrleitung mit einer Zahnradpumpe.The present invention relates to a gear pump for conveying fluid media, such as in particular viscous media, and a delivery pipe with a gear pump.

Zahnradpumpen für das Fördern von fluiden Medien, wie insbesondere von viskosen Medien, sind bestens bekannt und mehrfach beschrieben, wie beispielsweise in der DE-19 41 673 und der DE-24 36 222.Gear pumps for the conveyance of fluid media, such as viscous media in particular, are well known and have been described several times, for example in DE-19 41 673 and DE-24 36 222.

In beiden Fällen wird eine besonders zum Austragen aus Reaktoren geeignete Zahnradpumpe mit grossvolumigem Pumpeneinlauf beschrieben. Dabei sind die Pumpengehäuse als doppelwandige, sogenannte "fully jacketed" Konstruktionen ausgeführt. Dabei erlaubt das umlaufende, geschlossene Kammervolumen eine ausgezeichnete Temperaturführung der Zahnradpumpe, was insbesondere bei Austragungsaggregaten von Polymeren bei der Polymersynthese wichtig ist. Als Temperiermedien finden in der Regel Dampf oder aber auch Wärmeträgeröle Verwendung.In both cases, a gear pump with a large-volume pump inlet that is particularly suitable for discharge from reactors is described. The pump housings are designed as double-walled, so-called "fully jacketed" constructions. The circumferential, closed chamber volume allows excellent temperature control of the gear pump, which is particularly important in the case of polymer discharge units in polymer synthesis. Steam or heat transfer oils are generally used as temperature control media.

Die Einspeisung dieser Beheizungsmedien erfolgt, wie beispielsweise in der DE-24 36 222 dargestellt, über zwei oder mehrere Temperieranschlussflansche des Pumpengehäuses.These heating media are fed in, as shown, for example, in DE-24 36 222, via two or more temperature control connection flanges of the pump housing.

Beide oben beschriebenen Pumpentypen verfügen zudem sowohl saug- als auch druckseitig über einen Montage- bzw. Anschlussflansch. Ueber diese Flansche müssen die Pumpen mit den vor- und nachgeschalteten Komponenten, wie beispielsweise mit dem Synthesereaktor, anschliessenden Förderleitungen, Granulieranlagen etc., vakuumdicht verbunden werden können.Both pump types described above also have a mounting or connection flange on both the suction and pressure side. The pumps must be able to be connected in a vacuum-tight manner to the upstream and downstream components, such as, for example, the synthesis reactor, subsequent delivery lines, pelletizing systems, etc. via these flanges.

Insbesondere saugseitig besteht die Gefahr eines Atmosphäreneintrittes über den Pumpenflansch, was zu erheblichen Problemen im oberhalb der Zahnradpumpe angeordneten Synthesereaktor führen kann.In particular on the suction side there is a risk of atmospheric entry via the pump flange, which leads to considerable problems can lead in the arranged above the gear pump synthesis reactor.

Es ist daher eine Aufgabe der vorliegenden Erfindung, eine Montagemöglichkeit sowohl saugseitig wie auch druckseitig zur Zahnradpumpe zu schaffen, welche einen absolut gasdichten Uebergang zu vorgeschalteten und nachgeschalteten Komponenten erlaubt.It is therefore an object of the present invention to provide an installation possibility both on the suction side and on the pressure side of the gear pump, which allows an absolutely gas-tight transition to upstream and downstream components.

Es ist eine weitere Aufgabe der vorliegenden Erfindung, eine einfache Anschlussmöglichkeit zu schaffen für das Zuführen und Abführen von Temperiermedien in das doppelwandige Gehäuse der Zahnradpumpe.It is a further object of the present invention to provide a simple connection option for supplying and removing temperature control media into the double-walled housing of the gear pump.

Erfindungsgemäss werden die gestellten Aufgaben mittels einer Zahnradpumpe gemäss dem Wortlaut insbesondere nach Anspruch 1 gelöst.According to the invention, the objects are achieved by means of a gear pump according to the wording, in particular according to claim 1.

Vorgeschlagen wird eine Zahnradpumpe zur Förderung von fluiden Medien, wie insbesondere viskosen Medien, welche saugseitig und/oder druckseitig bzw. förderseitig rohr- oder kragenartige Abschnitte aufweist, um die Pumpe schweissbar mit weiteren vor- oder nachgeschalteten Anlagekomponenten zu verbinden.A gear pump for conveying fluid media, in particular viscous media, is proposed, which has tube-like or collar-like sections on the suction side and / or pressure side or on the delivery side in order to weldably connect the pump to further upstream or downstream system components.

Dabei wird eine Zahnradpumpe der eingangs geschilderten Art vorgeschlagen, welche ein doppelwandiges Pumpengehäuse aufweist mit einer Anordnung, vorgesehen, um die Pumpe beheizen bzw. kühlen zu können. Die Anordnung ist geeignet für das Durchströmen bzw. Durchsetzen von fluiden Heiz- bzw. Temperiermedien, wie insbesondere beispielsweise Dampf oder Wärmeträgeröle.A gear pump of the type described at the outset is proposed, which has a double-walled pump housing with an arrangement, in order to be able to heat or cool the pump. The arrangement is suitable for flowing through or passing through fluid heating or tempering media, such as, in particular, steam or heat transfer oils, for example.

Vorzugsweise weist die erfindungsgemäss vorgeschlagene Zahnradpumpe im Bereich des oder der schweissbaren Abschnitte(s) eine oder mehrere Verbindungsöffnung(en) mit dem durch die Doppelwandigkeit des Gehäuses gebildeten Zwischenraum auf, vorgesehen für die Zufuhr bzw. das Abführen des Beheizungs- bzw. Temperiermediums.The gear pump proposed according to the invention preferably has in the area of the weldable section (s) one or more connection opening (s) with the space formed by the double wall of the housing, provided for the supply or discharge of the heating or tempering medium.

Der oder die Abschnitt(e) sind saug- und/oder druckseitig der Zahnradpumpe in Form eines rohrartigen Kragens ausgebildet, geeignet, um darauf eine entsprechend dimensionierte, rohrförmige Oeffnung einer daran anschliessenden Komponente, wie beispielsweise eine Rohrleitung, vorzugsweise stumpf geschweisst, fest mit der Pumpe zu verbinden.The section (s) are designed on the suction and / or pressure side of the gear pump in the form of a tubular collar, suitable for firmly fitting a correspondingly dimensioned tubular opening of a component connected thereto, such as a pipeline, preferably butt-welded Connect pump.

Koaxial über diesem einen rohrartigen Kragen angeordnet, ist saug- und/oder druckseitig der Zahnradpumpe ein weiterer rohrartiger Kragen angeordnet, ebenfalls vorgesehen, um eine weitere, die eine Rohrleitung koaxial umgebende Rohrleitung, vorzugsweise stumpf geschweisst, fest mit der Pumpe zu verbinden, wobei der zwischen den beiden Rohrleitungen gebildete Zwischenraum gegebenenfalls zur Förderung des Heiz- bzw. Temperiermediums dienen kann.Arranged coaxially above this one tube-like collar, another tube-like collar is arranged on the suction and / or pressure side of the gear pump, also provided in order to firmly connect another tube, which is coaxially surrounding a tube, preferably butt welded, to the pump, the the space formed between the two pipes may optionally serve to promote the heating or tempering medium.

Aufgrund der wesentlich grösseren Druckverhältnisse druckseitig der Zahnradpumpe ist der eine rohrartige Kragen druckseitig bzw. förderseitig vorzugsweise mit einer grösseren Wandstärke versehen als der eine rohrartige Kragen saugseits.Due to the substantially larger pressure ratios on the pressure side of the gear pump, the one tubular collar on the pressure side or on the delivery side is preferably provided with a greater wall thickness than the one tubular collar on the suction side.

Der grosse Vorteil der erfindungsgemäss vorgeschlagenen Zahnradpumpe liegt darin, dass im Betrieb die Zahnradpumpe absolut gasdicht mit einer vorgeschalteten bzw. nachgeschalteten Anlagenkomponente verbunden ist bzw. in eine entsprechende Rohrleitung eingebaut ist. Somit entfällt auch die Notwendigkeit, bekannt von herkömmlichen, aus dem Stand der Technik bekannten Pumpen, dass in den Anschlussflanschen angeordnete Ringdichtungen von Zeit zu Zeit ersetzt werden müssen, da sie beispielsweise infolge der hohen Temperaturen bei Anschlüssen an Synthesereaktoren verspröden können.The great advantage of the gear pump proposed according to the invention is that the gear pump is connected in an absolutely gas-tight manner to an upstream or downstream system component during operation or is installed in a corresponding pipeline. Thus, there is also no need, as is known from conventional pumps known from the prior art, for those arranged in the connecting flanges Ring seals have to be replaced from time to time, as they can become brittle, for example due to the high temperatures at connections to synthesis reactors.

Ein weiterer Vorteil der erfindungsgemäss vorgeschlagenen Zahnradpumpe liegt darin, dass an der Zahnradpumpe keine seitlichen Anschlüsse vorzusehen sind für das Zuführen bzw. Abführen von Heiz- bzw. Temperiermedien. Schlussendlich müssen bei Wartung bzw. bei Revision von Pumpen diese nicht ausgebaut werden. Durch Entfernen der Gehäusedeckel können die Innenteile (Wellen, Lager) entfernt und später nach ihrer Revision wieder eingebaut werden.A further advantage of the gear pump proposed according to the invention is that there are no lateral connections to be provided on the gear pump for the supply or discharge of heating or tempering media. In the end, pumps do not need to be removed for maintenance or revision. By removing the housing cover, the inner parts (shafts, bearings) can be removed and later reinstalled after their revision.

Die Erfindung wird nun anschliessend beispielsweise unter Bezug auf die beigefügten Figuren näher erläutert.The invention will now be explained in more detail, for example with reference to the accompanying figures.

Dabei zeigen:

Fig. 1
im Schnitt eine doppelwandige Zahnradpumpe, bekannt aus dem Stand der Technik, und
Fig. 2
im Schnitt eine doppelwandige Zahnradpumpe gemäss der vorliegenden Erfindung.
Show:
Fig. 1
on average a double-walled gear pump, known from the prior art, and
Fig. 2
on average a double-walled gear pump according to the present invention.

In Fig. 1 ist eine Zahnradpumpe im Schnitt gemäss dem Stand der Technik beschrieben, aufweisend ein doppelwandiges Gehäuse. Das Gehäuse 1 der Zahnradpumpe enthält die vertikale Eintrittsöffnung 3, welche durch einen Hohlkonus gebildet wird. In Pfeilrichtung 10 wird das zu fördernde Medium in die Zahnradpumpe eingeführt und durch die beiden Zahnwellen 4 und 5 gefördert und gegen die Austrittsöffnung 9 gepresst. Durch die Austrittsöffnung 9 wird das zu fördernde Medium in Pfeilrichtung 10' einer nachgeschalteten Komponente zugeführt. Wie aus Fig. 1 deutlich erkennbar, weist die Zahnradpumpe saugseitig eine grössere Oeffnung auf als druckseitig bei der Austrittsöffnung.In Fig. 1, a gear pump is described in section according to the prior art, having a double-walled housing. The housing 1 of the gear pump contains the vertical inlet opening 3, which is formed by a hollow cone. In the direction of arrow 10, the medium to be conveyed is introduced into the gear pump and conveyed through the two toothed shafts 4 and 5 and pressed against the outlet opening 9. The medium to be conveyed is fed through the outlet opening 9 in the direction of arrow 10 'to a downstream component. As can be clearly seen from FIG. 1, the gear pump has a suction side a larger opening than on the pressure side at the outlet opening.

Das Gehäuse 1 ist, wie deutlich aus Fig. 1 erkennbar, doppelwandig ausgebildet, aufweisend die äusseren Gehäusehälften 14 und 15 sowie einen Zwischenraum 13, welcher sich durch die doppelwandige Ausbildung ergibt. In den beiden Gehäusehälften 14 und 15 sind Leitungen 16 und 16' angeordnet für das Zu- und Abführen des Temperiermediums. Der Zwischenraum bzw. die Kanäle 13 bilden den Heizmantel der Pumpe, um beispielsweise bei einer einer Polymersynthese nachgeschalteten Zahnradpumpe zu verhindern, dass durch rasches Abkühlen des hochviskosen Polymers ein Fördern erschwert bzw. praktisch verunmöglicht wird. Schlussendlich weist die in Fig. 1 dargestellte Zahnradpumpe aus dem Stand der Technik sowohl saugseitig wie druckseitig einen Anschlussflansch 18 bzw. 18' auf, um die Pumpe mit vor- bzw. nachgeschalteten Komponenten zu verbinden.The housing 1 is, as can be clearly seen from FIG. 1, double-walled, having the outer housing halves 14 and 15 and an intermediate space 13, which results from the double-walled design. Lines 16 and 16 'are arranged in the two housing halves 14 and 15 for the supply and discharge of the temperature control medium. The intermediate space or the channels 13 form the heating jacket of the pump, in order to prevent, for example in the case of a gear pump connected downstream of a polymer synthesis, that conveying is made difficult or practically impossible by rapid cooling of the highly viscous polymer. Finally, the gear pump shown in FIG. 1 from the prior art has a connecting flange 18 or 18 'on the suction side as well as on the pressure side in order to connect the pump to upstream or downstream components.

Fig. 2 zeigt demgegenüber im Schnitt eine erfindungsgemässe Zahnradpumpe, wobei analoge Teile in bezug auf die Zahnradpumpe aus Fig. 1 mit denselben Referenzzahlen bezeichnet sind. Wiederum weist die Pumpe ein Gehäuse 1 auf sowie eine vertikale Eintrittsöffnung 3, durch welche in Pfeilrichtung 10 das zu fördernde Medium eingeführt wird. Zahnwellen 4 und 5 treiben das Medium gegen die Austrittsöffnung 9, wo das Medium in Pfeilrichtung 10' die Pumpe in Richtung einer nachgeschalteten Komponente verlässt. Das äussere Gehäuse weist die beiden Hälften 14 und 15 auf sowie infolge der Doppelwandigkeit Zwischenräume bzw. Kanäle 13, welche vorgesehen sind für das Temperieren der Zahnradpumpe.FIG. 2, on the other hand, shows a gear pump according to the invention in section, analog parts with reference to the gear pump from FIG. 1 being designated with the same reference numbers. Again, the pump has a housing 1 and a vertical inlet opening 3 through which the medium to be pumped is introduced in the direction of the arrow 10. Toothed shafts 4 and 5 drive the medium against the outlet opening 9, where the medium leaves the pump in the direction of the arrow 10 'in the direction of a downstream component. The outer housing has the two halves 14 and 15 and, as a result of the double wall, spaces or channels 13 which are provided for the temperature control of the gear pump.

Erfindungsgemäss weist nun die in Fig. 2 dargestellte Zahnradpumpe sowohl saugseitig wie auch druckseitig je zwei rohrartige Kragenanschlüsse 21, 26, 31 und 36 auf, welche beispielsweise stumpf geschweisst über Schweissungen 22, 28, 32 und 38 mit den Anschlussflanschen 18 bzw. 18' der Pumpe verbunden sind. Dabei bilden die beiden rohrförmigen Kragen 21 und 31 die inneren Anschlüsse, welche dazu vorgesehen sind, mit entsprechenden Anschlüssen von vor- bzw. nachgeschalteten Komponenten verbunden zu werden für das Führen des zu fördernden Mediums. Der Anschluss beispielsweise von Rohrleitungen vor- und nachgeschaltet zur Pumpe kann ebenfalls stumpf geschweisst mit den beiden Rohrabschnitten 21 und 31 verbunden werden, da diese jeweils vorzugsweise konusartig abgeschrägte Anschlusspartien 24 bzw. 34 aufweisen.According to the invention, the gear pump shown in FIG. 2 now has two tube-like sections on both the suction side and the pressure side Collar connections 21, 26, 31 and 36, which are butt welded, for example, to the connection flanges 18 and 18 'of the pump via welds 22, 28, 32 and 38, respectively. The two tubular collars 21 and 31 form the inner connections, which are intended to be connected to corresponding connections of upstream and downstream components for guiding the medium to be conveyed. The connection of, for example, pipelines upstream and downstream to the pump can also be butt welded to the two pipe sections 21 and 31, since these each preferably have conical beveled connection parts 24 and 34, respectively.

Die beiden koaxial und ausserhalb der Rohrabschnitte 21 und 31 angeordneten weiteren Rohrabschnitte 26 und 36 sind dazu vorgesehen, um mit gegebenenfalls koaxial zu Anschlussrohren angeordneten äusseren Mantelrohren wiederum vorzugsweise stumpf geschweisst verbunden zu werden, wobei in dem durch die je beiden koaxialen Anschlussrohrleitungen gebildeten Mantelraum ein Temperiermedium der Zahnradpumpe zu- bzw. abgeführt werden kann. Dies erfolgt wiederum über Anschlüsse 16 bzw. 16', welche die Zwischenräume bzw. Kanäle 13 mit den mantelartigen Zwischenräumen 30 bzw. 40 verbinden, welche in den kragenartigen Anschlüssen bzw. den damit verschweisst verbundenen Anschlussrohrleitungen gebildet sind.The two further pipe sections 26 and 36 which are arranged coaxially and outside of the pipe sections 21 and 31 are provided in order to be preferably butt-welded to outer casing pipes which are optionally arranged coaxially to connecting pipes, with a temperature control medium in the casing space formed by the two coaxial connecting pipe lines the gear pump can be supplied or removed. This in turn takes place via connections 16 and 16 ', which connect the intermediate spaces or channels 13 to the jacket-like intermediate spaces 30 and 40, which are formed in the collar-like connections or the connecting pipelines welded to them.

Somit ist in Fig. 2 nun deutlich erkennbar, dass im Betrieb der Zahnradpumpe die eingangs gestellte Aufgabe sicher gelöst wird, indem die Gefahr des Atmosphäreneintrittes beispielsweise saugseitig vollständig gebannt ist. Auch druckseitig ist ein Entweichen des geförderten Mediums an der Anschlussstelle unmöglich. Der weitere Vorteil der erfindungsgemäss dargestellten Zahnradpumpe liegt in der Einfachheit der Zu- und Abfuhrleitung für das Zuführen bzw. Entfernen des Heiz- bzw. Temperiermediums.Thus, it can now be clearly seen in FIG. 2 that the task set at the outset is reliably achieved during operation of the gear pump by completely eliminating the risk of atmospheric entry, for example on the suction side. It is also impossible for the pumped medium to escape at the connection point on the pressure side. The further advantage of the gear pump shown in accordance with the invention lies in the simplicity of the feed and discharge line for feeding or removing the heating or Temperature control medium.

Weiter in Fig. 2 ist deutlich erkennbar, dass der kragenartige Rohrabschnitt 31 wesentlich stärker ausgebildet ist als der entsprechende Rohrabschnitt 21 saugseitig. Dies hängt damit zusammen, dass förder- bzw. druckseitig wesentlich höhere Druckverhältnisse herrschen, wie beispielsweise 250bar oder mehr, währenddem saugseitig Atmosphärendruck oder ein Unterdruck herrscht, welcher weniger starke Rohrleitungen zulässt.2 that the collar-like tube section 31 is designed to be significantly stronger than the corresponding tube section 21 on the suction side. This is related to the fact that the pressure or pressure side has significantly higher pressure ratios, for example 250 bar or more, while there is atmospheric pressure or a negative pressure on the suction side which permits less strong pipelines.

Die erfindungsgemäss dargestellte Zahnradpumpe eignet sich insbesondere als Austragungsaggregat in der Polymersynthese, wo aus Synthesereaktoren hochviskose Polymerschmelze ausgetragen werden muss und wo in der Regel grosse Volumen zu fördern sind. Speziell bei derartigen Austragungsaggregaten ist es wesentlich, dass saugseitig kein Atmosphäreneintritt erfolgt. Zudem sind diese Austragungsaggregate vorzugsweise beheizbar, damit hochviskose Materialien infolge Abkühlung nicht noch dickflüssiger werden.The gear pump shown according to the invention is particularly suitable as a discharge unit in polymer synthesis, where highly viscous polymer melt has to be discharged from synthesis reactors and where large volumes are generally to be conveyed. In the case of such discharge units in particular, it is essential that no atmosphere enters on the suction side. In addition, these discharge units are preferably heatable so that highly viscous materials do not become even more viscous as a result of cooling.

Bei der in Fig. 2 dargestellten erfindungsgemässen Zahnradpumpe handelt es sich nur um ein Beispiel, das auf beliebige Art und Weise abgeändert, ergänzt und modifiziert werden kann. So ist es selbstverständlich unerheblich, wie die saugseitig und druckseitig angeordneten Schweissabschnitte ausgebildet sind. Auch ist es nicht zwingend notwendig, dass die Anschlüsse der vor- und nachgeschalteten Komponenten mittels Stumpfschweissen erfolgen; irgendwelche andere Schweisstechniken sind selbstverständlich ebenfalls im Grundgedanken der vorliegenden Erfindung miteingeschlossen.The gear pump according to the invention shown in FIG. 2 is only an example that can be modified, supplemented and modified in any way. So it is of course irrelevant how the welding sections arranged on the suction and pressure sides are designed. It is also not absolutely necessary for the upstream and downstream components to be connected by butt welding; any other welding techniques are of course also included in the spirit of the present invention.

Claims (8)

Zahnradpumpe zur Förderung von fluiden Medien, wie insbesondere viskosen Medien, gekennzeichnet durch saugseitig und/oder druck- bzw. förderseitig vorgesehene kragenartige Abschnitte (21, 26, 31, 36), um die Pumpe mit weiteren Anlagekomponenten gasdicht zu verschweissen.Gear pump for the conveyance of fluid media, such as in particular viscous media, characterized by collar-like sections (21, 26, 31, 36) provided on the suction side and / or pressure or delivery side in order to gas-tightly weld the pump to other system components. Zahnradpumpe, insbesondere nach Anspruch 1, dadurch gekennzeichnet, dass im oder am Pumpengehäuse (1) eine Anordnung (13) vorgesehen ist, um die Pumpe zu beheizen bzw. zu temperieren.Gear pump, in particular according to claim 1, characterized in that an arrangement (13) is provided in or on the pump housing (1) in order to heat or temper the pump. Zahnradpumpe, insbesondere nach Anspruch 2, dadurch gekennzeichnet, dass die Anordnung (13) mittels fluiden Medien durchsetzbar ist.Gear pump, in particular according to claim 2, characterized in that the arrangement (13) can be enforced by means of fluid media. Zahnradpumpe, insbesondere nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Pumpe ein wenigstens teilweise doppelwandiges Gehäuse (1) aufweist für die Aufnahme und das Durchströmen des durch die Doppelwandigkeit gebildeten Zwischenraumes (13) von einem Heiz- bzw. Temperiermedium und dass im Bereich der schweissbaren Abschnitte (21, 26, 31, 36) eine oder mehrere Verbindungsöffnung(en) (16, 16') mit dem oder den Zwischenräumen (13) vorgesehen sind für die Zufuhr bzw. Abfuhr des Heiz- bzw. Temperiermediums.Gear pump, in particular according to one of claims 1 to 3, characterized in that the pump has an at least partially double-walled housing (1) for receiving and flowing through the intermediate space (13) formed by the double-walled wall of a heating or tempering medium and that in the area of the weldable sections (21, 26, 31, 36) one or more connection openings (16, 16 ') with the space or spaces (13) are provided for the supply or discharge of the heating or temperature control medium. Zahnradpumpe, insbesondere nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der oder die Abschnitt(e) saugseitig und/oder druckseitig der Pumpe in Form eines rohrartigen Kragens (21, 31) ausgebildet ist (sind), vorgesehen und geeignet, um darauf eine entsprechend dimensionierte rohrförmige Oeffnung einer oder mehrerer daran anschliessender Komponenten, wie eine Reaktoröffnung, eine Rohrleitung und dergleichen, vorzugsweise stumpf geschweisst, fest mit der Pumpe zu verbinden.Gear pump, in particular according to one of claims 1 to 4, characterized in that the section (s) on the suction side and / or pressure side of the pump is (are) designed and suitable in the form of a tubular collar (21, 31) thereupon a correspondingly dimensioned tubular opening of one or more adjoining components, such as a reactor opening, a pipeline and the like, preferably butt welded, to be firmly connected to the pump. Zahnradpumpe, insbesondere nach Anspruch 5, dadurch gekennzeichnet, dass ein weiterer, den einen rohrartigen Kragen (21, 31) koaxial umgebender rohrartiger Kragen (26, 36) angeordnet ist, um eine weitere, die eine Rohrleitung koaxial umgebende Rohrleitung, vorzugsweise stumpf geschweisst, fest mit der Pumpe zu verbinden, wobei der zwischen den Rohrleitungen gebildete Zwischen- bzw. Mantelraum gegebenenfalls zur Förderung des Heiz- bzw. Temperiermediums dient.Gear pump, in particular according to claim 5, characterized in that a further tube-like collar (26, 36) coaxially surrounding the tubular collar (21, 31) is arranged around another tube, preferably butt-welded, surrounding the pipeline, firmly connected to the pump, the intermediate or jacket space formed between the pipes possibly serving to convey the heating or temperature control medium. Zahnradpumpe, insbesondere nach einem der Ansprüche 5 oder 6, dadurch gekennzeichnet, dass der eine rohrartige Kragen (31) förder- bzw. druckseitig eine grössere Wandstärke aufweist als der eine rohrartige Kragen (21) saugseitig.Gear pump, in particular according to one of claims 5 or 6, characterized in that the one tubular collar (31) on the delivery or pressure side has a greater wall thickness than the one tubular collar (21) on the suction side. Förderrohrleitung mit einer Zahnradpumpe, dadurch gekennzeichnet, dass die Pumpe gasdicht in die Leitung eingeschweisst ist.Delivery pipeline with a gear pump, characterized in that the pump is welded gas-tight into the line.
EP95114623A 1995-09-08 1995-09-18 Gear pump Expired - Lifetime EP0753665B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP95114623A EP0753665B1 (en) 1995-09-18 1995-09-18 Gear pump
DE59509082T DE59509082D1 (en) 1995-09-18 1995-09-18 Gear pump for conveying fluid media
TW087216659U TW454822U (en) 1995-09-18 1996-08-30 Gear pump for conveying viscous fluid media
US08/707,253 US5772417A (en) 1995-09-18 1996-09-03 Gear pump for conveying viscous fluid media and method of making same
KR1019960038189A KR970016133A (en) 1995-09-08 1996-09-04 Gear Pumps for Fluid Media Transfer
JP8238124A JPH09166093A (en) 1995-09-18 1996-09-09 Gear pump for carrying fluidized medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95114623A EP0753665B1 (en) 1995-09-18 1995-09-18 Gear pump

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EP0753665A1 true EP0753665A1 (en) 1997-01-15
EP0753665B1 EP0753665B1 (en) 2001-03-07

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EP95114623A Expired - Lifetime EP0753665B1 (en) 1995-09-08 1995-09-18 Gear pump

Country Status (6)

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US (1) US5772417A (en)
EP (1) EP0753665B1 (en)
JP (1) JPH09166093A (en)
KR (1) KR970016133A (en)
DE (1) DE59509082D1 (en)
TW (1) TW454822U (en)

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EP0822336A2 (en) * 1997-11-07 1998-02-04 Maag Pump Systems Textron AG Method for stabilizing the temperature of gear pumps
GR1007248B (en) * 2009-06-25 2011-04-29 Ιωαννης Χατζοπουλος Double-sleeve gear pump

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US6213745B1 (en) 1999-05-03 2001-04-10 Dynisco High-pressure, self-lubricating journal bearings
US6179594B1 (en) 1999-05-03 2001-01-30 Dynisco, Inc. Air-cooled shaft seal
US7143866B2 (en) * 2000-11-16 2006-12-05 Wld, Llc Strand lubrication
EP3382203B1 (en) 2017-03-30 2024-05-15 Roper Pump Company LLC Progressive cavity pump with integrated heating jacket

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DE2436222A1 (en) 1973-08-23 1975-02-27 Maag Zahnraeder & Maschinen Ag GEAR PUMP FOR HIGHLY VISCOSE MEDIA

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FR896297A (en) * 1942-07-20 1945-02-16 Fried Krupp Germaniawerft Ag Housing for rotary gear pumps
FR1194511A (en) * 1958-03-05 1959-11-10 Open casing powder pump
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DE753585C (en) * 1941-01-12 1953-05-04 Ig Farbenindustrie Ag Heatable gear pump
DE1941673A1 (en) 1969-08-16 1971-02-18 Barmag Barmer Maschf Gear pump with wedge-shaped narrowed intake chambers
DE2436222A1 (en) 1973-08-23 1975-02-27 Maag Zahnraeder & Maschinen Ag GEAR PUMP FOR HIGHLY VISCOSE MEDIA

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0822336A2 (en) * 1997-11-07 1998-02-04 Maag Pump Systems Textron AG Method for stabilizing the temperature of gear pumps
EP0822336A3 (en) * 1997-11-07 1998-05-20 Maag Pump Systems Textron AG Method for stabilizing the temperature of gear pumps
US6280164B1 (en) 1997-11-07 2001-08-28 Maag Pump Systems Textron Ag Method and apparatus for temperature stabilization in gear pumps
GR1007248B (en) * 2009-06-25 2011-04-29 Ιωαννης Χατζοπουλος Double-sleeve gear pump

Also Published As

Publication number Publication date
DE59509082D1 (en) 2001-04-12
JPH09166093A (en) 1997-06-24
EP0753665B1 (en) 2001-03-07
KR970016133A (en) 1997-04-28
TW454822U (en) 2001-09-11
US5772417A (en) 1998-06-30

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