EP0368124A1 - Multistage Roots pump and its assembly method - Google Patents

Multistage Roots pump and its assembly method Download PDF

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Publication number
EP0368124A1
EP0368124A1 EP89120181A EP89120181A EP0368124A1 EP 0368124 A1 EP0368124 A1 EP 0368124A1 EP 89120181 A EP89120181 A EP 89120181A EP 89120181 A EP89120181 A EP 89120181A EP 0368124 A1 EP0368124 A1 EP 0368124A1
Authority
EP
European Patent Office
Prior art keywords
lobe
stator
flange
screws
lobes
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
EP89120181A
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German (de)
French (fr)
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EP0368124B1 (en
Inventor
Dominique Guittet
Eric Taberlet
Jean-François Vuillermoz
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.)
Alcatel CIT SA
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Alcatel CIT SA
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Publication date
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Priority to AT89120181T priority Critical patent/ATE86010T1/en
Publication of EP0368124A1 publication Critical patent/EP0368124A1/en
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Publication of EP0368124B1 publication Critical patent/EP0368124B1/en
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
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F01C21/102—Adjustment of the interstices between moving and fixed parts of the machine by means other than fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/60—Assembly methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2230/00—Manufacture
    • F05B2230/60—Assembly methods
    • 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
    • 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
    • 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
    • Y10T403/00—Joints and connections
    • Y10T403/70—Interfitted members
    • Y10T403/7047—Radially interposed shim or bushing
    • Y10T403/7051—Wedging or camming
    • Y10T403/7052—Engaged by axial movement
    • Y10T403/7056—Threaded actuator
    • 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
    • Y10T403/00—Joints and connections
    • Y10T403/70—Interfitted members
    • Y10T403/7062—Clamped members
    • Y10T403/7064—Clamped members by wedge or cam
    • Y10T403/7066—Clamped members by wedge or cam having actuator
    • Y10T403/7067—Threaded actuator
    • Y10T403/7069—Axially oriented

Definitions

  • the present invention relates to a multi-stage roots pump comprising a stator and a rotor assembly, the stator defining a plurality of successive compression chambers, each compression chamber being limited axially by two flanges and radially by a stator ring, the rotor assembly being located inside the stator and consisting of two parallel shafts, each shaft comprising in each compression chamber a compression lobe which is attached and fixed, when the pump is mounted on its shaft, the shafts being supported by bearings in flanges located at the ends of the stator and comprising a synchronization gear located in a casing fixed to one of the end flanges, one of the shafts being driven in rotation by a drive motor.
  • French documents 2,517,755 (USA 4,504,201) and 660,528 disclose a multistage pump of this type.
  • each stage of the stator is constituted by a kind of box without cover, which is closed during assembly by juxtaposition with the next stage, thus each stator stage forms a chamber axially limited by an integral flange of the floor considered and by a flange belonging to the previous floor.
  • the rotors are mounted on the shafts in an unspecified manner but appear, in consideration of FIG. 1, keyed on the shafts.
  • stator is shown in FIG. 3 and appears to be in one piece, while for the rotors, the rotary pistons are mounted keyed on the shafts.
  • the object of the invention is to produce a modular multi-stage roots pump, with simple manufacturing parts allowing precise machining, and allowing very precise mounting, in particular of the position of the rotary lobes on the shafts so as to achieve a machine with very small lateral clearances between the lobes and the flanges, of the order of mm and therefore reach deeper voids than in current machines, of the order of a decade.
  • the subject of the invention is therefore a multi-stage roots pump such as as defined above, characterized in that said flanges and stator rings are separate pieces stacked alternately and in that each compression lobe is composed of a body and a flange, the flange being fixed to the body by screws arranged axially, and compressing a set of two conical rings, one of which penetrates inside the other by undergoing a radial narrowing ensuring the fixing of the lobe on its shaft.
  • the flange of a compression lobe comprises four clamping screws for its fixing against its body, thus, during operation d), the flange of each lobe is only fixed to its respective body by two of these four screws and without tightening, then, during operation g), two so-called mounting screws are used provided with washers pressing against the mounting plate, these two mounting screws being screwed into the two tapped holes in each lobe body, not occupied by clamping screws, then under operation h), tighten the two clamping screws and then carry out operation i), we then place in place of the two mounting screws removed, the two remaining tightening screws to which the tightening torque is applied, then continue operations j) to l) indicated above.
  • the roots pump of the invention comprises a stator and a rotor assembly.
  • the stator defines a plurality of compression chambers such as the chamber 20.
  • Each chamber 20 is bounded radially by a stator ring 21 and axially by two lateral flanges, separating the chambers from one another.
  • FIG. 3 only the first lateral flange 22 is seen, which is the lower end flange.
  • a second flange 22 which comes to rest on the upper end of the stator ring 21.
  • This second flange has its internal surface at the same level as its support against the stator ring 21, in the same way as the first end flange 22 shown.
  • the part which rests on the upper end of the stator ring 21 is not a lateral flange 22, but a simple mounting plate 23, the role of which will be explained below.
  • the stator is thus constituted by an alternative series of flanges 22 and stator rings 21 up to the upper end flange.
  • the rotor assembly located inside the stator comprises two parallel shafts 24 and 25 mounted on ball bearings 26, 27 carried by the flanges 22 located at the ends of the machine.
  • the shafts 24 and 25 are each equipped, in each chamber 20, with a compression lobe 28.
  • the compression lobes 28 being attached to the shafts during assembly, the separation flanges are each in a single part.
  • Figure 1 shows in exploded view a compression lobe 28. It comprises a lobe body 29 and a flange 30.
  • the flange 30 is used to compress, by means of a washer 31 a set of two conical rings 32 and 33 , so as to fix the lobe on its tree. Tightening is carried out by means of four clamping screws 34 which pass through smooth holes in the flange 30 and are screwed into tapped holes 35 in the body 29.
  • the ring 33 enters the ring 32, and when the screws are tightened 34, the ring 33 undergoes a radial narrowing ensuring the fixing of the lobe 28 on its shaft.
  • the washer 31 and the flange 30 can be made in one piece.
  • Each lobe 28 further comprises two smooth, blind, tracing holes 36 used to position the lobes respectively relative to one another during assembly.
  • the shafts comprise a synchronization gear composed of two pinions 37 and 38 mounted respectively on the shafts 24 and 25.
  • This gear is located inside a casing 39 fixed by screws 40 to the flange of end 22.
  • the casing 39 contains lubricating oil.
  • the compression chambers 20 are isolated from this oil by lip seals 41 and 42.
  • the shaft 24 is rotated by a drive motor, not shown. It should be noted that on each shaft, the compression lobes, in the different successive chambers, are offset from one chamber to the next, angularly, by ⁇ 2 .
  • the different flanges 22 and stator rings 21 are positioned between them by centering pins and fixed to each other by screws.
  • This mounting plate 23 has on its internal face and inside the perimeter delimiting the internal wall 47 of the stator ring 21, an additional thickness j penetrating into the stator ring, and which corresponds to the desired axial clearance between the lobes 28 and the flange 22 which will be placed next, and which does not include any additional thickness. Then the lobes 28 are pressed against this mounting plate 23 using for each lobe, two mounting screws 48 which are screwed into the two tapped holes 35 not occupied by clamping screws. These mounting screws 48 are supported by means of support washers 49, against the upper face of the mounting plate 23. By thus screwing these two screws 48, the lobe is pressed against the underside of the mounting plate 23.
  • the pump is arranged horizontally.
  • the pump has a suction port and a discharge port and each chamber has an intermediate discharge communicating with an intermediate suction of the next chamber, this by orifices made in the flanges 22, but this is known and does not do not part of the invention and has not been shown.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Steroid Compounds (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

La pompe comporte un stator constitué par une succession alternative de flasques (22) et de couronnes statoriques (21) définissant une suite de chambre de compression (20), et un ensemble rotorique composé de deux arbres (24, 25) comprenant chacun, dans chaque chambre de compression (20) un lobe de compression (28), ces lobes de compression étant rapportés et fixés sur leur arbre lors du montage de la pompe, permettant ainsi d'ajuster individuellement les jeux axiaux entre les lobes et les flasques, chaque lobe étant composé d'un corps (29) et d'une bride (30) qui est fixé au corps par des vis (34) en comprimant un ensemble de deux bagues coniques (32, 33) dont l'une (33) pénètre dans l'autre en subissant un rétrécissement axial assurant la fixation du lobe. Le procédé de montage consiste à utiliser un plateau de montage (23) comportant une surépaisseur j pénétrant à l'intérieur de la couronne statorique et correspondant au jeu souhaité entre les lobes et les flasques (22). On positionne angulairement les lobes au moyen de piges (45) et on les positionne axialement en les plaquant contre le flasque de montage (23) au moyen de vis de montage (48). Ceci fait, on assure la fixation du lobe contre son arbre en serrant des vis de montage (34) qui compriment des bagues coniques (32, 33) venant se serrer contre l'arbre.The pump comprises a stator constituted by an alternating succession of flanges (22) and stator rings (21) defining a series of compression chambers (20), and a rotor assembly composed of two shafts (24, 25) each comprising, in each compression chamber (20) a compression lobe (28), these compression lobes being attached and fixed to their shaft during assembly of the pump, thus making it possible to individually adjust the axial clearances between the lobes and the flanges, each lobe being composed of a body (29) and a flange (30) which is fixed to the body by screws (34) by compressing a set of two conical rings (32, 33) one of which (33) penetrates in the other by undergoing an axial narrowing ensuring the fixation of the lobe. The mounting method consists in using a mounting plate (23) having an extra thickness j penetrating inside the stator ring and corresponding to the desired clearance between the lobes and the flanges (22). The lobes are angularly positioned by means of rods (45) and they are positioned axially by pressing them against the mounting flange (23) by means of mounting screws (48). This done, the lobe is secured against its shaft by tightening mounting screws (34) which compress conical rings (32, 33) coming to tighten against the shaft.

Description

La présente invention concerne une pompe roots multiétagée comprenant un stator et un ensemble rotorique, le stator définissant une pluralité de chambres successives de compression, chaque chambre de compression étant limitée axialement par deux flasques et radialement par une couronne statorique, l'ensemble rotorique étant situé à l'intérieur du stator et constitué de deux arbres parallèles, chaque arbre comprenant dans chaque chambre de compression un lobe de compression qui est rapporté et fixé, lors du montage de la pompe sur son arbre, les arbres étant supportés par des paliers dans des flasques situés aux extrémités du stator et comprenant un engrenage de synchronisation situé dans un carter fixé à l'un des flasques d'extrémité, l'un des arbres étant entraîné en rotation par un moteur d'entraînement.The present invention relates to a multi-stage roots pump comprising a stator and a rotor assembly, the stator defining a plurality of successive compression chambers, each compression chamber being limited axially by two flanges and radially by a stator ring, the rotor assembly being located inside the stator and consisting of two parallel shafts, each shaft comprising in each compression chamber a compression lobe which is attached and fixed, when the pump is mounted on its shaft, the shafts being supported by bearings in flanges located at the ends of the stator and comprising a synchronization gear located in a casing fixed to one of the end flanges, one of the shafts being driven in rotation by a drive motor.

On connaît par les documents français 2 517 755 (USA 4 504 201) et 660 528 une pompe multiétagée de ce type.French documents 2,517,755 (USA 4,504,201) and 660,528 disclose a multistage pump of this type.

Dans le document 2 517 755, chaque étage du stator est constitué par une espèce de boîte sans couvercle, qui se trouve fermée lors du montage par la juxtaposition avec l'étage suivant, ainsi chaque étage statorique forme une chambre limitée axialement par un flasque solidaire de l'étage considéré et par un flasque appartenant à l'étage précédent. Les rotors sont montés sur les arbres d'une façon non précisée mais paraissent, en considération de la figure 1, clavetés sur les arbres.In document 2 517 755, each stage of the stator is constituted by a kind of box without cover, which is closed during assembly by juxtaposition with the next stage, thus each stator stage forms a chamber axially limited by an integral flange of the floor considered and by a flange belonging to the previous floor. The rotors are mounted on the shafts in an unspecified manner but appear, in consideration of FIG. 1, keyed on the shafts.

Dans le document 660 528, le stator est représenté dans la figure 3 et semble être monobloc, tandis que pour les rotors, les pistons rotatifs sont montés clavetés sur les arbres.In document 660,528, the stator is shown in FIG. 3 and appears to be in one piece, while for the rotors, the rotary pistons are mounted keyed on the shafts.

L'invention a pour but de réaliser une pompe roots multiétagée modulaire, avec des pièces de fabrication simple permettant un usinage précis, et permettant un montage d'une grande précision, notamment de la position des lobes rotatifs sur les arbres de manière à réaliser une machine avec des jeux latéraux très faibles entre les lobes et les flasques, de l'ordre de

Figure imgb0001
mm et donc d'atteindre des vides plus poussés que dans les machines actuelles, de l'ordre d'une décade.The object of the invention is to produce a modular multi-stage roots pump, with simple manufacturing parts allowing precise machining, and allowing very precise mounting, in particular of the position of the rotary lobes on the shafts so as to achieve a machine with very small lateral clearances between the lobes and the flanges, of the order of

Figure imgb0001
mm and therefore reach deeper voids than in current machines, of the order of a decade.

L'invention a ainsi pour objet une pompe roots multiétagée telle que définie ci-dessus, caractérisée en ce que lesdits flasques et couronnes statoriques sont des pièces distinctes empilées alternative­ment et en ce que chaque lobe de compression est composé d'un corps et d'une bride, la bride étant fixée au corps par des vis disposées axialement, et comprimant un ensemble de deux bagues coniques, dont l'une pénètre intérieurement dans l'autre en subissant un rétrécissement radial assurant la fixation du lobe sur son arbre.The subject of the invention is therefore a multi-stage roots pump such as as defined above, characterized in that said flanges and stator rings are separate pieces stacked alternately and in that each compression lobe is composed of a body and a flange, the flange being fixed to the body by screws arranged axially, and compressing a set of two conical rings, one of which penetrates inside the other by undergoing a radial narrowing ensuring the fixing of the lobe on its shaft.

L'invention a en outre pour objet un procédé de montage d'une pompe roots telle que définie, caractérisée par la succession des opérations suivantes :

  • a) on monte les deux arbres dans un flasque d'extrémité en y fixant leur position axiale,
  • b) on monte l'engrenage de synchronisation sur les arbres,
  • c) on place la première couronne statorique par dessus le flasque d'extrémité et on la fixe,
  • d) on enfile un lobe de compression sur chaque arbre, la bride étant fixée au corps de lobe, mais sans serrage,
  • e) on met en place un plateau de montage que l'on fixe contre la couronne statorique, ledit plateau de montage comportant sur sa face interne, à l'intérieur du périmètre délimitant la paroi interne de la couronne statorique, une surépaisseur j pénétrant dans la couronne statorique et correspondant au jeu axial souhaité entre les lobes et le flasque,
  • f) on fixe la position angulaire des lobes au moyen de piges que l'on enfile dans des trous prévus dans les lobes, à travers des trous également prévus dans ledit plateau,
  • g) les lobes sont plaqués contre le plateau de montage par le moyen de vis de montage s'appuyant contre le plateau de montage et dont les tiges pénètrent dans des trous lisses du plateau et viennent se visser dans des trous taraudés des corps de lobes, les tirant vers le plateau,
  • h) on serre les vis de serrage des brides des lobes contre leur corps assurant ainsi la fixation axiale des lobes sur leur arbre respectif,
  • i) on ôte les vis de montage de l'opération g,
  • j) on ôte les piges de l'opération f,
  • k) on ôte le plateau de montage et l'on vient placer et fixer le flasque suivant,
  • l) on recommence cycliquement les opérations précédentes c à k jusqu'au dernier flasque à l'extrémité supérieure du stator.
The invention further relates to a method for mounting a roots pump as defined, characterized by the succession of the following operations:
  • a) the two shafts are mounted in an end flange by fixing their axial position there,
  • b) the synchronization gear is mounted on the shafts,
  • c) the first stator ring is placed over the end flange and fixed,
  • d) a compression lobe is threaded on each shaft, the flange being fixed to the lobe body, but without tightening,
  • e) a mounting plate is put in place which is fixed against the stator ring, said mounting plate comprising on its internal face, inside the perimeter delimiting the internal wall of the stator ring, an additional thickness j entering the stator crown and corresponding to the desired axial clearance between the lobes and the flange,
  • f) the angular position of the lobes is fixed by means of rods which are threaded into holes provided in the lobes, through holes also provided in said plate,
  • g) the lobes are pressed against the mounting plate by means of mounting screws pressing against the mounting plate and the rods of which penetrate into smooth holes in the plate and are screwed into tapped holes in the lobe bodies, pulling them towards the plateau,
  • h) the clamping screws of the lobe flanges are tightened against their body, thus ensuring the axial fixing of the lobes on their respective shafts,
  • i) the mounting screws of operation g are removed,
  • j) we remove the rods from operation f,
  • k) remove the mounting plate and place and fix the flange following,
  • l) the preceding operations c to k are cyclically repeated until the last flange at the upper end of the stator.

Selon une réalisation particulière préférée, la bride d'un lobe de compression comporte quatre vis de serrage pour sa fixation contre son corps, ainsi, lors de l'opération d), la bride de chaque lobe n'est fixée à son corps respectif que par deux de ces quatre vis et sans serrage, puis, lors de l'opération g), on utilise deux dites vis de montage munies de rondelles d'appui contre le plateau de montage, ces deux vis de montage venant se visser dans les deux trous taraudés de chaque corps de lobe, non occupés par des vis de serrage, puis sous l'opération h), on serre les deux vis de serrage et on réalise ensuite l'opération i), on vient ensuite placer à la place des deux vis de montage retirées, les deux vis de serrage restantes auxquelles on applique le couple de serrage, on poursuit ensuite les opérations j) à l) indiquées ci-dessus.According to a particular preferred embodiment, the flange of a compression lobe comprises four clamping screws for its fixing against its body, thus, during operation d), the flange of each lobe is only fixed to its respective body by two of these four screws and without tightening, then, during operation g), two so-called mounting screws are used provided with washers pressing against the mounting plate, these two mounting screws being screwed into the two tapped holes in each lobe body, not occupied by clamping screws, then under operation h), tighten the two clamping screws and then carry out operation i), we then place in place of the two mounting screws removed, the two remaining tightening screws to which the tightening torque is applied, then continue operations j) to l) indicated above.

L'invention sera bien comprise à la lumière de la description d'un exemple de réalisation, faite ci-après en regard du dessin annexé dans lequel :

  • La figure 1 montre en vue éclatée un lobe de compression d'une pompe roots multiétagée selon l'invention.
  • La figure 2 est une vue selon l'axe de la machine d'une pompe selon l'invention, sans flasque de séparation, permettant de voir une chambre de compression, deux lobes et une couronne statorique.
  • La figure 3 est une vue partielle de la pompe selon l'invention, la montrant au cours de son montage, cette vue correspond à une coupe selon III-III de la figure 2.
The invention will be clearly understood in the light of the description of an exemplary embodiment, given below with reference to the appended drawing in which:
  • Figure 1 shows in exploded view a compression lobe of a multi-stage roots pump according to the invention.
  • Figure 2 is a view along the axis of the machine of a pump according to the invention, without separation flange, allowing to see a compression chamber, two lobes and a stator crown.
  • FIG. 3 is a partial view of the pump according to the invention, showing it during its assembly, this view corresponds to a section on III-III of FIG. 2.

En se référant aux figures, la pompe roots de l'invention comprend un stator et un ensemble rotorique. Le stator définit une pluralité de chambres de compression telle que la chambre 20. Chaque chambre 20 est limitée radialement par une couronne statorique 21 et axialement par deux flasques latéraux, séparant les chambres les unes des autres. Sur la figure 3, on ne voit que le premier flasque latéral 22 qui est le flasque d'extrémité inférieur. Sur cette figure, on ne voit également que la première chambre 20 et que la première couronne statorique 21. Ainsi, après la première couronne statorique 21 vient se placer un second flasque 22 qui vient s'appuyer sur l'extrémité supérieure de la couronne statorique 21. Ce second flasque, non représenté, a sa surface interne au même niveau que son appui contre la couronne statorique 21, de la même manière que le premier flasque d'extrémité 22 représenté. Sur la figure 3, la pièce qui repose sur l'extrémité supérieure de la couronne statorique 21 n'est pas un flasque latéral 22, mais un simple plateau de montage 23 dont on expliquera le rôle par la suite. Le stator est ainsi constitué par une suite alternative de flasques 22 et de couronnes statoriques 21 jusqu'au flasque supérieur d'extrémité.Referring to the figures, the roots pump of the invention comprises a stator and a rotor assembly. The stator defines a plurality of compression chambers such as the chamber 20. Each chamber 20 is bounded radially by a stator ring 21 and axially by two lateral flanges, separating the chambers from one another. In FIG. 3, only the first lateral flange 22 is seen, which is the lower end flange. In this figure, we also see only the first chamber 20 and that the first stator ring 21. Thus, after the first stator ring 21 is placed a second flange 22 which comes to rest on the upper end of the stator ring 21. This second flange, not shown, has its internal surface at the same level as its support against the stator ring 21, in the same way as the first end flange 22 shown. In FIG. 3, the part which rests on the upper end of the stator ring 21 is not a lateral flange 22, but a simple mounting plate 23, the role of which will be explained below. The stator is thus constituted by an alternative series of flanges 22 and stator rings 21 up to the upper end flange.

L'ensemble rotorique, situé à l'intérieur du stator comprend deux arbres 24 et 25 parallèles montés sur paliers à billes 26, 27 portés par les flasques 22 situés aux extrémités de la machine.The rotor assembly, located inside the stator comprises two parallel shafts 24 and 25 mounted on ball bearings 26, 27 carried by the flanges 22 located at the ends of the machine.

Les arbres 24 et 25 sont équipés chacun, dans chaque chambre 20, d'un lobe de compression 28.The shafts 24 and 25 are each equipped, in each chamber 20, with a compression lobe 28.

Ces lobes de compression 28 ne sont pas d'une seule venue avec les arbres 24 et 25, mais sont rapportés sur ces arbres et fixés sur eux lors du montage de la pompe, permettant ainsi de régler individuellement les jeux axiaux.These compression lobes 28 are not in one go with the shafts 24 and 25, but are attached to these shafts and fixed on them during assembly of the pump, thus making it possible to individually adjust the axial clearances.

Les lobes de compression 28 étant rapportés sur les arbres lors du montage, les flasques de séparation sont chacun en une seule partie.The compression lobes 28 being attached to the shafts during assembly, the separation flanges are each in a single part.

La figure 1 montre en vue éclatée un lobe de compression 28. Il comprend un corps de lobe 29 et une bride 30. La bride 30 sert à comprimer, par l'intermédiaire d'une rondelle 31 un ensemble de deux bagues coniques 32 et 33, de façon à fixer le lobe sur son arbre. Le serrage est effectué au moyen de quatre vis de serrage 34 qui passent dans des trous lisses de la bride 30 et viennent se visser dans des trous taraudés 35 du corps 29. La bague 33 pénètre dans la bague 32, et lors du serrage des vis 34, la bague 33 subit un rétrécissement radial assurant la fixation du lobe 28 sur son arbre. La rondelle 31 et la bride 30 peuvent être réalisées en une seule pièce.Figure 1 shows in exploded view a compression lobe 28. It comprises a lobe body 29 and a flange 30. The flange 30 is used to compress, by means of a washer 31 a set of two conical rings 32 and 33 , so as to fix the lobe on its tree. Tightening is carried out by means of four clamping screws 34 which pass through smooth holes in the flange 30 and are screwed into tapped holes 35 in the body 29. The ring 33 enters the ring 32, and when the screws are tightened 34, the ring 33 undergoes a radial narrowing ensuring the fixing of the lobe 28 on its shaft. The washer 31 and the flange 30 can be made in one piece.

Chaque lobe 28 comprend en outre deux trous lisses, borgnes, de piétage 36 servant à positionner respectivement les lobes l'un par rapport à l'autre au cours du montage.Each lobe 28 further comprises two smooth, blind, tracing holes 36 used to position the lobes respectively relative to one another during assembly.

En revenant à la figure 3, on voit qu'au delà du flasque d'extrémité 22, les arbres comportent un engrenage de synchronisation composé de deux pignons 37 et 38 montés respectivement sur les arbres 24 et 25. Cet engrenage est situé à l'intérieur d'un carter 39 fixé par des vis 40 au flasque d'extrémité 22. En fonctionnement, le carter 39 contient de l'huile de lubrification. Les chambres de compression 20 sont isolées de cette huile par des joints d'étanchéité à lèvres 41 et 42. L'arbre 24 est entraîné en rotation par un moteur d'entraînement non représenté. Il est à noter que sur chaque arbre, les lobes de compression, dans les différentes chambres successives, sont décalés d'une chambre à la suivante, angulairement, de π 2

Figure imgb0002
.Returning to Figure 3, we see that beyond the flange end 22, the shafts comprise a synchronization gear composed of two pinions 37 and 38 mounted respectively on the shafts 24 and 25. This gear is located inside a casing 39 fixed by screws 40 to the flange of end 22. In operation, the casing 39 contains lubricating oil. The compression chambers 20 are isolated from this oil by lip seals 41 and 42. The shaft 24 is rotated by a drive motor, not shown. It should be noted that on each shaft, the compression lobes, in the different successive chambers, are offset from one chamber to the next, angularly, by π 2
Figure imgb0002
 .

Les différents flasques 22 et couronnes statoriques 21 sont positionnés entre eux par des pions de centrage et fixés les uns aux autres par des vis.The different flanges 22 and stator rings 21 are positioned between them by centering pins and fixed to each other by screws.

On va maintenant décrire le procédé de montage de la pompe, en se référant à la figure 3.We will now describe the pump mounting process, referring to Figure 3.

On commence par positionner axialement les arbres 24 et 25 dans le flasque d'extrémité 22 avec les roulements 26, 27 et les joints 41 et 42. On monte ensuite les pignons 37 et 38 sur les arbres 24 et 25. On vient ensuite placer et fixer la première couronne statorique 21, puis, sur chaque arbre, on enfile un lobe de compression 28. Deux des quatre vis de serrage 34 sont seulement mises en place, mais sans appliquer de couple de serrage. On voit sur la figure 2, sur chaque lobe 28, ces deux vis 34, disposées symétriquement par rapport à l'axe de leur arbre. Sur la figure 3, on ne voit qu'une seule vis 34 sur le lobe de gauche. Les lobes sont positionnés angulairement "à vue de nez" de telle sorte que les logements libres (figure 2) 43 dans les brides 30 pour les vis de serrage 34 coïncident avec la position qu'auront les trous 44 ménagés dans le plateau de montage 23 lorsque l'on viendra mettre ce plateau en place. Ceci de façon à permettre la mise en place de piges de position­nement 45 dans les trous de piètage 36 (figure 1) des lobes 28 à travers des trous prévus dans le plateau 23, assurant le positionnement angulaire précis et le blocage des lobes 28. On vient donc placer le plateau de montage 23 et introduire ces piges 45. Le plateau de montage 23 est positionné par deux pions 46 et fixé par quatre vis contre la couronne statorique 21. Ce plateau de montage 23 comporte sur sa face interne et à l'intérieur du périmètre délimitant la paroi interne 47 de la couronne statorique 21, une surépaisseur j pénétrant dans la couronne statorique, et qui correspond au jeu axial souhaité entre les lobes 28 et le flasque 22 qui sera placé ensuite, et qui ne comporte pas de surépaisseur. On vient ensuite plaquer les lobes 28 contre ce plateau de montage 23 en utilisant pour chaque lobe, deux vis de montage 48 que l'on vient visser dans les deux trous taraudés 35 non occupés par des vis de serrage. Ces vis de montage 48 prennent appui par l'intermédiaire de rondelles d'appui 49, contre la face supérieure du plateau de montage 23. En vissant ainsi ces deux vis 48, on plaque le lobe contre la face inférieure du plateau de montage 23.We start by axially positioning the shafts 24 and 25 in the end flange 22 with the bearings 26, 27 and the seals 41 and 42. We then mount the pinions 37 and 38 on the shafts 24 and 25. We then place and fix the first stator ring 21, then, on each shaft, a compression lobe 28 is threaded. Two of the four tightening screws 34 are only put in place, but without applying a tightening torque. We see in Figure 2, on each lobe 28, these two screws 34, arranged symmetrically relative to the axis of their shaft. In Figure 3, we see only one screw 34 on the left lobe. The lobes are positioned angularly "within sight" so that the free housings (FIG. 2) 43 in the flanges 30 for the clamping screws 34 coincide with the position of the holes 44 made in the mounting plate 23 when we come to put this tray in place. This so as to allow the positioning of positioning rods 45 in the base holes 36 (FIG. 1) of the lobes 28 through holes provided in the plate 23, ensuring precise angular positioning and blocking of the lobes 28. On therefore comes to place the mounting plate 23 and introduce these pins 45. The mounting plate 23 is positioned by two pins 46 and fixed by four screws against the stator ring 21. This mounting plate 23 has on its internal face and inside the perimeter delimiting the internal wall 47 of the stator ring 21, an additional thickness j penetrating into the stator ring, and which corresponds to the desired axial clearance between the lobes 28 and the flange 22 which will be placed next, and which does not include any additional thickness. Then the lobes 28 are pressed against this mounting plate 23 using for each lobe, two mounting screws 48 which are screwed into the two tapped holes 35 not occupied by clamping screws. These mounting screws 48 are supported by means of support washers 49, against the upper face of the mounting plate 23. By thus screwing these two screws 48, the lobe is pressed against the underside of the mounting plate 23.

On applique ensuite aux deux vis de serrage 34 mises en place, le couple de serrage prévu à l'aide d'un tournevis 50. Cette action a pour effet de comprimer les deux bagues 32 et 33 et de les serrer contre l'arbre 24 (ou 25). On peut alors ôter les vis de montage 48 et venir placer et serrer les deux autres vis de serrage 34.Then applied to the two tightening screws 34, the tightening torque provided using a screwdriver 50. This action has the effect of compressing the two rings 32 and 33 and tightening them against the shaft 24 (or 25). We can then remove the mounting screws 48 and place and tighten the other two clamping screws 34.

Il suffit ensuite de retirer les piges 45, puis d'ôter le plateau de montage 23. On place alors le second flasque 22, puis la seconde couronne statorique 21, et on recommence les opérations précédentes cycliquement jusqu'au dernier flasque 22 d'extrémité supérieur.Then simply remove the pins 45, then remove the mounting plate 23. Then place the second flange 22, then the second stator ring 21, and repeat the previous operations cyclically to the last flange 22 end superior.

Une fois le montage terminé, la pompe est disposée horizontalement.Once the assembly is complete, the pump is arranged horizontally.

Bien entendu, le pompe possède un orifice d'aspiration et un orifice de refoulement et chaque chambre comporte un refoulement intermédiaire communiquant avec une aspiration intermédiaire de la chambre suivante, ceci par des orifices pratiqués dans les flasques 22, mais ceci est connu et ne fait pas partie de l'invention et n'a pas été représenté.Of course, the pump has a suction port and a discharge port and each chamber has an intermediate discharge communicating with an intermediate suction of the next chamber, this by orifices made in the flanges 22, but this is known and does not do not part of the invention and has not been shown.

Claims (3)

1/ Pompe roots multiétagée comprenant un stator et un ensemble rotorique, le stator définissant une pluralité de chambres successives (20) de compression, chaque chambre de compression étant limitée axialement par deux flasques (22) et radialement par une couronne statorique (21), l'ensemble rotorique étant situé à l'intérieur du stator et constitué de deux arbres parallèles (24, 25), chaque arbre comprenant dans chaque chambre de compression (20) un lobe de compression (28), qui est rapporté et fixé, lors du montage de la pompe sur son arbre, les arbres étant supportés par des paliers (26, 27) dans les flasques (22) situés aux extrémités du stator et comprenant un engrenage de synchronisation (37, 38) situé dans un carter (39) fixé à l'un des flasques d'extrémité, l'un (24) des arbres étant entraîné en rotation par un moteur d'entraînement, caractérisée en ce que lesdits flasques (22) et couronnes statoriques (21) sont des pièces distinctes empilées alternativement, et en ce que chaque lobe de compression est composé d'un corps (29) et d'une bride (30), la bride étant fixée au corps par des vis (34) disposées axialement, et comprimant un ensemble de deux bagues coniques (32, 33) dont l'une (33) pénètre intérieurement dans l'autre en subissant un rétrécissement radial assurant la fixation du lobe sur son arbre.1 / Multi-stage roots pump comprising a stator and a rotor assembly, the stator defining a plurality of successive compression chambers (20), each compression chamber being limited axially by two flanges (22) and radially by a stator crown (21), the rotor assembly being located inside the stator and consisting of two parallel shafts (24, 25), each shaft comprising in each compression chamber (20) a compression lobe (28), which is attached and fixed, during mounting the pump on its shaft, the shafts being supported by bearings (26, 27) in the flanges (22) located at the ends of the stator and comprising a synchronization gear (37, 38) located in a casing (39) fixed to one of the end flanges, one (24) of the shafts being driven in rotation by a drive motor, characterized in that said flanges (22) and stator rings (21) are separate pieces stacked alt ernatively, and in that each compression lobe is composed of a body (29) and a flange (30), the flange being fixed to the body by screws (34) arranged axially, and compressing a set of two rings conical (32, 33) one of which (33) penetrates internally into the other undergoing a radial narrowing ensuring the fixing of the lobe on its shaft. 2/ Procédé de montage d'une pompe roots multiétagée selon la revendication 1, caractérisé par la succession des opérations suivantes : a) on monte les deux arbres (24, 25) dans un flasque d'extrémité (22) en y fixant leur position axiale, b) on monte l'engrenage de synchronisation (37, 38) sur les arbres, c) on place la première couronne statorique (21) par dessus le flasque d'extrémité (22) et on la fixe, d) on enfile un lobe de compression (28) sur chaque arbre, la bride (30) étant fixée au corps de lobe, mais sans serrage, e) on met en place un plateau de montage (23) que l'on fixe contre la couronne statorique (21), ledit plateau de montage comportant sur sa face interne, à l'intérieur du périmètre délimitant la paroi interne de la couronne statorique (21) une surépaisseur j pénétrant dans la couronne statorique et correspondant au jeu axial souhaité entre les lobes et le flasque, f) on fixe la position angulaire des lobes (28) au moyen de piges (45) que l'on enfile dans des trous (36) prévus dans les lobes, à travers des trous également prévus dans ledit plateau, g) les lobes sont plaqués contre le plateau de montage (23) par le moyen de vis de montage (48) s'appuyant contre le plateau de montage et dont les tiges pénètrent dans des trous lisses du plateau (44) et viennent se visser dans des trous taraudés (35) des corps de lobes, les tirant vers le plateau (23, h) on serre les vis de serrage (34) des brides des lobes contre leur corps assurant ainsi la fixation axiale des lobes (28) sur leur arbre respectif (24, 25), i) on ôte les vis de montage (48) de l'opération g, j) on ôte les piges (45) de l'opération f, k) on ôte le plateau de montage (23) et l'on vient placer et fixer le flasque (22) suivant, l) on recommence cycliquement les opérations précédentes c à k jusqu'au dernier flasque (22) à l'extrémité supérieure du stator. 2 / A method of mounting a multi-stage roots pump according to claim 1, characterized by the succession of the following operations: a) the two shafts (24, 25) are mounted in an end flange (22) by fixing their axial position there, b) the synchronization gear (37, 38) is mounted on the shafts, c) the first stator ring (21) is placed over the end flange (22) and fixed, d) a compression lobe (28) is threaded onto each shaft, the flange (30) being fixed to the lobe body, but without tightening, e) a mounting plate (23) is put in place which is fixed against the stator ring (21), said mounting plate comprising on its internal face, inside the perimeter delimiting the internal wall of the stator ring (21) an extra thickness j entering the stator crown and corresponding to the desired axial clearance between the lobes and the flange, f) the angular position of the lobes (28) is fixed by means of rods (45) which are threaded into holes (36) provided in the lobes, through holes also provided in said plate, g) the lobes are pressed against the mounting plate (23) by means of mounting screws (48) pressing against the mounting plate and the rods of which penetrate into smooth holes in the plate (44) and are screwed in tapped holes (35) of the lobe bodies, pulling them towards the plate (23, h) the clamping screws (34) of the lobe flanges are tightened against their body, thus ensuring the axial fixing of the lobes (28) on their respective shaft (24, 25), i) the mounting screws (48) are removed from operation g, j) we remove the rods (45) from operation f, k) the mounting plate (23) is removed and the following flange (22) is placed and fixed, l) the preceding operations c to k are cyclically repeated until the last flange (22) at the upper end of the stator. 3/ Procédé selon la revendication 2, caractérisé en ce que, la bride (30) d'un lobe de compression (28) comportant quatre vis de serrage (34) pour sa fixation contre son corps (29), lors de l'opération d) de la revendication 4, la bride de chaque lobe n'est fixée à son corps respec­tif que par deux de ces quatre vis (34) et sans serrage, en ce que lors de l'opération g, on utilise deux dites vis de montage (48) munies de rondelles d'appui (49) contre le plateau de montage, ces deux vis de montage venant se visser dans les deux trous taraudés (35) de chaque corps de lobe, non occupés par des vis de serrage (34), en ce que sous l'opération h, on serre les deux vis de serrage (34) puis on réalise l'opération i, on vient ensuite placer à la place des deux vis de monta­ge (48) retirées, les deux vis de serrage restantes (34) auxquelles on applique le couple de serrage, on poursuit ensuite les opérations j à l.3 / A method according to claim 2, characterized in that, the flange (30) of a compression lobe (28) comprising four clamping screws (34) for fixing against its body (29), during the operation d) of claim 4, the flange of each lobe is fixed to its respective body only by two of these four screws (34) and without tightening, in that during operation g, two said screws are used. mounting (48) provided with support washers (49) against the mounting plate, these two mounting screws being screwed into the two tapped holes (35) of each lobe body, not occupied by clamping screws (34 ), in that under operation h, the two clamping screws (34) are tightened and then operation i is carried out, then the two mounting screws (48) removed are placed, the two screws remaining tightening (34) to which the tightening torque is applied, then operations j to l are continued.
EP89120181A 1988-11-07 1989-10-31 Multistage roots pump and its assembly method Expired - Lifetime EP0368124B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89120181T ATE86010T1 (en) 1988-11-07 1989-10-31 MULTISTAGE ROOTS PUMP AND ITS ASSEMBLY PROCEDURE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8814493 1988-11-07
FR8814493A FR2638786B1 (en) 1988-11-07 1988-11-07 MULTI-STAGE ROOTS PUMP AND METHOD FOR MOUNTING SUCH A PUMP

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EP0368124A1 true EP0368124A1 (en) 1990-05-16
EP0368124B1 EP0368124B1 (en) 1993-02-24

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EP (1) EP0368124B1 (en)
JP (1) JPH0631626B2 (en)
AT (1) ATE86010T1 (en)
DE (1) DE68905027T2 (en)
ES (1) ES2039805T3 (en)
FR (1) FR2638786B1 (en)
RU (1) RU1834986C (en)

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Publication number Priority date Publication date Assignee Title
DE102010051316A1 (en) 2010-11-13 2012-05-16 Pfeiffer Vacuum Gmbh vacuum pump

Families Citing this family (4)

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Publication number Priority date Publication date Assignee Title
US6095781A (en) * 1997-09-11 2000-08-01 Viking Pump, Inc. Timed element, high pressure, industrial rotary lobe pump
US6123526A (en) * 1998-09-18 2000-09-26 Industrial Technology Research Institute Multistage pump and method for assembling the pump
US6783342B2 (en) * 2001-09-26 2004-08-31 United Dominion Industries, Inc. Method and apparatus for timing rotors in a rotary lobe pump
EP2532895B1 (en) * 2011-06-06 2014-02-26 Vacuubrand Gmbh + Co Kg Vacuum pump with pump rotor bearings on a single side

Citations (2)

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Publication number Priority date Publication date Assignee Title
FR660528A (en) * 1928-09-17 1929-07-12 Cfcmug Multi-cell roots compressor for high pressures
US4504201A (en) * 1982-11-22 1985-03-12 The Boc Group Plc Mechanical pumps

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US4425816A (en) * 1981-01-05 1984-01-17 Komori Printing Machinery Co., Ltd. Structure for securing a cylinder drive gear to the end of a cylinder shaft in a printing machine
JPH0733834B2 (en) * 1986-12-18 1995-04-12 株式会社宇野澤組鐵工所 Inner partial-flow reverse-flow cooling multistage three-leaf vacuum pump in which the outer peripheral temperature of the housing with built-in rotor is stabilized

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
FR660528A (en) * 1928-09-17 1929-07-12 Cfcmug Multi-cell roots compressor for high pressures
US4504201A (en) * 1982-11-22 1985-03-12 The Boc Group Plc Mechanical pumps

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010051316A1 (en) 2010-11-13 2012-05-16 Pfeiffer Vacuum Gmbh vacuum pump
EP2461040A1 (en) 2010-11-13 2012-06-06 Pfeiffer Vacuum GmbH Vacuum pump and joint of shaft and rotary piston

Also Published As

Publication number Publication date
EP0368124B1 (en) 1993-02-24
JPH0631626B2 (en) 1994-04-27
US5013227A (en) 1991-05-07
DE68905027D1 (en) 1993-04-01
RU1834986C (en) 1993-08-15
ATE86010T1 (en) 1993-03-15
FR2638786A1 (en) 1990-05-11
FR2638786B1 (en) 1990-12-07
JPH02157489A (en) 1990-06-18
DE68905027T2 (en) 1993-06-17
ES2039805T3 (en) 1993-10-01

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