EP0368124B1 - Multistage roots pump and its assembly method - Google Patents
Multistage roots pump and its assembly method Download PDFInfo
- Publication number
- EP0368124B1 EP0368124B1 EP89120181A EP89120181A EP0368124B1 EP 0368124 B1 EP0368124 B1 EP 0368124B1 EP 89120181 A EP89120181 A EP 89120181A EP 89120181 A EP89120181 A EP 89120181A EP 0368124 B1 EP0368124 B1 EP 0368124B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stator
- lobe
- assembly
- plate
- screws
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 6
- 230000006835 compression Effects 0.000 claims abstract description 31
- 238000007906 compression Methods 0.000 claims abstract description 31
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 208000031968 Cadaver Diseases 0.000 description 3
- 241000282898 Sus scrofa Species 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 240000008042 Zea mays Species 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
Images
Classifications
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- 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
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- 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 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
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
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
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.
- 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 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 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.
- 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
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
Les arbres 24 et 25 sont équipés chacun, dans chaque chambre 20, d'un lobe de compression 28.The
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
Les lobes de compression 28 étant rapportés sur les arbres lors du montage, les flasques de séparation sont chacun en une seule partie.The
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
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
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
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
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
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
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
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
Claims (3)
- A multistage Roots pump comprising a rotor assembly and a stator, the stator defining a plurality of successive compression chambers (20), each compression chamber being delimited axially by two stator plates (22), and radially by a stator ring (21), the rotor assembly being situated inside the stator and being constituted by two parallel shafts (24, 25), each shaft comprising a compression lobe (28) in each compression chamber (20), the lobes being placed and fixed on their shafts during assembly of the pump, the shafts being supported by bearings (26, 27) in the stator plates (22) situated at the ends of the stator, and including synchronizing gearing (37, 38) situated in a housing (39) fixed to one of the end stator plates, one of the shafts (24) being driven by a drive motor, the pump being characterized in that said stator plates (22) and stator rings (21) are separate parts stacked in alternation, and in that each compression lobe is constituted by a body (29) and a clamping plate (30), the clamping plate being fixed to the body by axially disposed screws (34) and compressing a set of two conical rings (32, 33), one of which (33) penetrates inside the other while being shrunk radially, thereby fixing the lobe on its shaft.
- A method of assembling a multistage Roots pump according to claim 1, the method being characterized by the following operations in succession:a) the two shafts (24, 25) are mounted in an end stator plate (22) and their axial positions are fixed therein;b) the synchronizing gearing (37, 38) is mounted on the shafts;c) the first stator ring (21) is fixed on the end stator plate (22) and is fixed thereto;d) a compression lobe (28) is threaded onto each of the shafts, with the clamping plates (30) being fixed to the lobe bodies, without being clamped thereto;e) an assembly plate (23) is put into place by being fixed against the stator ring (21), said assembly plate having a portion of increased thickness on its inside face within the perimeter delimiting the inside wall of the stator ring (21), the extra thickness penetrating a distance j into the stator ring and corresponding to the desired axial clearance between the lobes and the stator plate;f) the angular positions of the lobes (28) are fixed by means of rods (45) which are threaded into holes (36) provided in the lobes, passing through holes also provided in the said assembly plate;g) the lobes are pressed against the assembly plate (23) by means of assembly screws (48) bearing against the assembly plate and having their shanks passing through smooth holes (44) in the assembly plate and screwing into tapped holes (35) in the lobe bodies, and drawing them towards the assembly plate (23);h) the clamping screws (34) are tightened, urging the lobe clamping plates against the lobe bodies and thus axially fixing the lobes (28) on their respective shafts (24, 25);i) the assembly screws (48) for operation g) are removed;j) the positioning rods (45) of operation f) are removed;k) the assembly plate (23) is removed and the following stator plate (22) is put into place; andl) preceding operations c) to k) are repeated cyclically until the last stator plate (22) at the top end of the stator has been put into place.
- A method according to claim 2, characterized in that the clamping plate (30) of each compression lobe (28) has four clamping screws (34) for fixing it against the corresponding body (29) during operation d) of claim 2, with the clamping plate of each lobe being fixed to the corresponding body by only two of these four screws (34) which screws are not tightened, in that during operation g) the two said assembly screws (48) provided with washers (49) bearing against the assembly plate are used and screwed into the two tapped holes (35) in each lobe body that are not occupied by the clamping screws (34), in that during operation h), the two clamping screws (34) are tightened, after which operation i) is performed, and then the two remaining clamping screws (34) are put in the places of the removed assembly screws (48) and tightening torque is applied thereto, after which operations j) and l) are performed.
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 |
---|---|---|---|
FR8814493A FR2638786B1 (en) | 1988-11-07 | 1988-11-07 | MULTI-STAGE ROOTS PUMP AND METHOD FOR MOUNTING SUCH A PUMP |
FR8814493 | 1988-11-07 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0368124A1 EP0368124A1 (en) | 1990-05-16 |
EP0368124B1 true EP0368124B1 (en) | 1993-02-24 |
Family
ID=9371624
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89120181A Expired - Lifetime EP0368124B1 (en) | 1988-11-07 | 1989-10-31 | Multistage roots pump and its assembly method |
Country Status (8)
Country | Link |
---|---|
US (1) | US5013227A (en) |
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) |
Families Citing this family (5)
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 |
DE102010051316A1 (en) | 2010-11-13 | 2012-05-16 | Pfeiffer Vacuum Gmbh | vacuum pump |
EP2532895B1 (en) * | 2011-06-06 | 2014-02-26 | Vacuubrand Gmbh + Co Kg | Vacuum pump with pump rotor bearings on a single side |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR660528A (en) * | 1928-09-17 | 1929-07-12 | Cfcmug | Multi-cell roots compressor for high pressures |
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 |
US4504201A (en) * | 1982-11-22 | 1985-03-12 | The Boc Group Plc | Mechanical pumps |
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 |
-
1988
- 1988-11-07 FR FR8814493A patent/FR2638786B1/en not_active Expired - Fee Related
-
1989
- 1989-10-31 ES ES198989120181T patent/ES2039805T3/en not_active Expired - Lifetime
- 1989-10-31 DE DE8989120181T patent/DE68905027T2/en not_active Expired - Fee Related
- 1989-10-31 AT AT89120181T patent/ATE86010T1/en not_active IP Right Cessation
- 1989-10-31 EP EP89120181A patent/EP0368124B1/en not_active Expired - Lifetime
- 1989-11-04 RU SU894742355A patent/RU1834986C/en active
- 1989-11-07 US US07/434,044 patent/US5013227A/en not_active Expired - Fee Related
- 1989-11-07 JP JP1289837A patent/JPH0631626B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE68905027D1 (en) | 1993-04-01 |
RU1834986C (en) | 1993-08-15 |
DE68905027T2 (en) | 1993-06-17 |
ES2039805T3 (en) | 1993-10-01 |
EP0368124A1 (en) | 1990-05-16 |
JPH0631626B2 (en) | 1994-04-27 |
US5013227A (en) | 1991-05-07 |
JPH02157489A (en) | 1990-06-18 |
ATE86010T1 (en) | 1993-03-15 |
FR2638786A1 (en) | 1990-05-11 |
FR2638786B1 (en) | 1990-12-07 |
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