EP1420933A1 - Displacement pump - Google Patents

Displacement pump

Info

Publication number
EP1420933A1
EP1420933A1 EP02764840A EP02764840A EP1420933A1 EP 1420933 A1 EP1420933 A1 EP 1420933A1 EP 02764840 A EP02764840 A EP 02764840A EP 02764840 A EP02764840 A EP 02764840A EP 1420933 A1 EP1420933 A1 EP 1420933A1
Authority
EP
European Patent Office
Prior art keywords
screws
zone
booster
pump according
threads
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02764840A
Other languages
German (de)
French (fr)
Inventor
Frédéric COTTAIS
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.)
Michelin Recherche et Technique SA Switzerland
Michelin Recherche et Technique SA France
Societe de Technologie Michelin SAS
Original Assignee
Michelin Recherche et Technique SA Switzerland
Michelin Recherche et Technique SA France
Societe de Technologie Michelin SAS
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 Michelin Recherche et Technique SA Switzerland, Michelin Recherche et Technique SA France, Societe de Technologie Michelin SAS filed Critical Michelin Recherche et Technique SA Switzerland
Publication of EP1420933A1 publication Critical patent/EP1420933A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/38—Plasticisers, homogenisers or feeders comprising two or more stages using two or more serially arranged screws in the same barrel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/488—Parts, e.g. casings, sealings; Accessories, e.g. flow controlling or throttling devices
    • B29B7/489—Screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7476—Systems, i.e. flow charts or diagrams; Plants
    • B29B7/7495—Systems, i.e. flow charts or diagrams; Plants for mixing rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/402—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders the screws having intermeshing parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion

Definitions

  • the present invention relates to positive displacement pumps intended in particular for rubber mixtures and, more particularly, gear pumps.
  • volumetric gear pumps for high viscosity plastic materials such as that described in publication US 5 120 206.
  • a gear comprising a motorized toothed drive wheel, "driving wheel”, and a second wheel in engagement with the first and driven in rotation by the latter, as well as a booster screw which makes it possible to forcefully feed said pump of high viscosity plastic material.
  • the rubber mixtures also have a very high viscosity which causes a very high resistive torque on the driving wheel.
  • This resistant torque is all the more important when one seeks to achieve high flow rates by increasing the width of the toothed wheels.
  • the positive displacement pump in particular for rubber mixtures, comprising force-feeding means for discharging the material towards an enclosure opening onto an outlet orifice and in which two counter-rotating screws rotate meshing with one another by through the respective helical threads they carry, the axial length of the meshing zone of these screws being greater than or equal to the sum of the thread pitch of the threads and the pitch of the propeller multiplied by the number of threads of each screws multiplied by 2.
  • the counter-rotating screws are meshed without contact.
  • This embodiment makes it possible to ensure the volume of the pumping and the reliability of the pump by transmitting a motor torque to each screw.
  • FIG. 1 is a longitudinal section of the pump according to the invention along the plane passing through the axes of rotation of each of the screws,
  • FIG. 2 is a radial section of the pump according to the invention according to line II-II shown in Figure 1.
  • the gear pump 1 comprises a body 10 which carry two counter-rotating screws 2 and 3 with axes parallel to each other.
  • the free ends 24 and 34 of these two screws 2 and 3 cooperate with one another by means of their helical threads, inside an enclosure 11 carried by the body 10 so as to pump volumetrically. Note that only the screw threads of screw 3 have been shown in dotted lines in FIG. 1.
  • the ends 24 and 34 form an association of elements comparable to a gear although there is no contact between the ends 24 and 34, nor between their threads.
  • each screw 2, 3 thus comprises several zones whose function and environment are different, which will be called zones A, B, C and D in Figures 1 and 2 for clarity.
  • Each screw 2, 3 thus has:
  • a feeding zone B which follows zone A in the direction of advancement of a mixture during the rotation of the screws, in which the parts 22, 32 of each screw 2, 3 rotate in a common chamber 4 without, however, the threads of the screws being in contact, one of the screws 2 having in this zone a diameter greater than the other screw,
  • zone C for the transmission of material flows follows zone B where there has been a separation of the flows of mixtures arriving on the corresponding parts of screws 23 and 33, the chamber 4 having been divided into two chambers 42 and 43 In this area the two screws 2 and 3 have the same diameter.
  • Zone A corresponds to the motorization of the pump by the motorization of each of the screws 2 and 3.
  • a single motor is used with a specific reduction gear to drive each of the screws. This reducer imposes an angular clearance between the screws 2 and 3 which preserves from mechanical contact their free ends 24 and 34.
  • bilateral mechanical stops not shown , in zone A axially position the two screws 2 and 3.
  • the zone B for supplying the mixture is itself axially divided into a zone B 'and a zone B "delimited by the radial wall 6, the zone B' being delimited by the internal wall 15 of the body 10.
  • the chamber 4 located in zone B is supplied by a single supply orifice 5 disposed in zone B 'circumferentially in between the axes of the two screws 2 and 3 therefore at the level of parts 22' and 32 'of the two screw.
  • the zone 32 ′ of the screw 3 of smaller diameter plays the role of a feed roller for the other screw, this zone having no thread and its diameter bringing it into contact with the wall 15 of the body 10.
  • the passage of the mixture between the axes of the two screws to the chamber 4 is produced by a thread 16 cut in the body 10 which opens into the zone B ".
  • the difference in diameter in this zone B in general makes it possible to facilitate the supply of mixture and thus to make the force-feeding of the pump.
  • zone B "to zone C consists of a division in two of the chamber 4 and a conical part 23 'of the screw 3 in order to reduce its diameter to a diameter identical to that of the screw 3.
  • the screws 2 and 3 must indeed have same twist and same flow upstream of their free ends so that the pump can operate.
  • each screw has a conical zone respectively 24 'and 34' making it possible to increase their diameter to adjust the flow rate between zones C and D.
  • an interesting form is to use involutes of circles for the sides of the nets.
  • the enclosure 11 opens onto a system converging towards an outlet 17 as seen in FIG. 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Pumps (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The invention relates to a displacement pump which is intended, in particular, for rubber mixtures. The inventive pump comprises boost means which drive the material towards a housing (11). Said housing opens into an outlet port (17) and contains two counter-rotating screws (24, 34) which engage with one another by means of the respective helicoidal threads thereof. The axial length of the intermeshing area of said screws (24, 34) is greater than or equal to the sum of the pitch of the threads and the pitch multiplied by the number of threads on each screw multiplied by 2.

Description

POMPE NOLUMETRIOUE NOLUMETRIOUE PUMP
La présente invention concerne les pompes volumétriques destinées notamment aux mélanges caoutchouteux et, plus particulièrement, les pompes à engrenage.The present invention relates to positive displacement pumps intended in particular for rubber mixtures and, more particularly, gear pumps.
II est connu d'utiliser des pompes volumétriques à engrenage pour des matériaux plastiques à haute viscosité telles que celle décrite dans la publication US 5 120 206. Une telle pompe utilise un engrenage comportant une roue dentée motorisée d'entraînement, « roue menante », et une deuxième roue en prise avec la première et entraînée en rotation par celle-ci, ainsi qu'une vis de gavage qui permet d'alimenter de façon forcée ladite pompe en matériau plastique à haute viscosité.It is known to use volumetric gear pumps for high viscosity plastic materials such as that described in publication US 5 120 206. Such a pump uses a gear comprising a motorized toothed drive wheel, "driving wheel", and a second wheel in engagement with the first and driven in rotation by the latter, as well as a booster screw which makes it possible to forcefully feed said pump of high viscosity plastic material.
Les mélanges caoutchouteux présentent également une très haute viscosité qui provoque un couple résistant très important sur la roue menante. Ce couple résistant est d'autant plus important que l'on cherche à atteindre des débits importants en augmentant la largeur des roues dentées. Ces difficultés sont tellement importantes que, dans les applications de pompes à engrenage au caoutchouc, on constate de fréquentes ruptures des roues dentées.The rubber mixtures also have a very high viscosity which causes a very high resistive torque on the driving wheel. This resistant torque is all the more important when one seeks to achieve high flow rates by increasing the width of the toothed wheels. These difficulties are so great that, in the application of rubber gear pumps, there are frequent ruptures of the toothed wheels.
Par ailleurs, l'atteinte de débit important pour les mélanges caoutchouteux est limitée par l'aspect thermique. En effet, l'augmentation de débit principalement fonction de l'augmentation de vitesse de rotation des roues dentées s'accompagnent d'une élévation importante de la température des mélanges caoutchouteux or cette température doit être à la fois maîtrisée et surtout son augmentation limitée pour éviter une vulcanisation anticipée de ces mélanges.In addition, the achievement of significant flow rate for rubber mixtures is limited by the thermal aspect. In fact, the increase in flow rate which is mainly a function of the increase in the speed of rotation of the toothed wheels is accompanied by a significant increase in the temperature of the rubber mixes, but this temperature must be both controlled and above all its increase limited for avoid early vulcanization of these mixtures.
L'invention vise à pallier l'ensemble de ces inconvénients. Selon l'invention, la pompe volumétrique notamment pour des mélanges caoutchouteux, comportant des moyens de gavage pour refouler la matière vers une enceinte débouchant sur un orifice de sortie et dans laquelle tournent deux vis contra-rotatives engrenant l'une avec l'autre par l'intermédiaire des filets hélicoïdaux respectifs qu'elles portent, la longueur axiale de la zone engrenante de ces vis étant supérieure ou égale à la somme du pas d'hélice des filets et du pas d'hélice multiplié par le nombre de filets de chaque vis multiplié par 2. Les vis contra-rotatives sont engrenantes sans contact.The invention aims to overcome all of these drawbacks. According to the invention, the positive displacement pump, in particular for rubber mixtures, comprising force-feeding means for discharging the material towards an enclosure opening onto an outlet orifice and in which two counter-rotating screws rotate meshing with one another by through the respective helical threads they carry, the axial length of the meshing zone of these screws being greater than or equal to the sum of the thread pitch of the threads and the pitch of the propeller multiplied by the number of threads of each screws multiplied by 2. The counter-rotating screws are meshed without contact.
Cette réalisation permet de s'assurer de la volumétrie du pompage et de la fiabilité de la pompe par la transmission d'un couple moteur à chaque vis.This embodiment makes it possible to ensure the volume of the pumping and the reliability of the pump by transmitting a motor torque to each screw.
D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture d'un exemple de réalisation d'une pompe volumétrique conforme à l'invention en référence au dessin dans lequel :Other characteristics and advantages of the invention will appear on reading an embodiment of a positive displacement pump according to the invention with reference to the drawing in which:
- la figure 1 est une coupe longitudinale de la pompe conforme à l'invention selon le plan passant par les axes de rotation de chacune des vis,FIG. 1 is a longitudinal section of the pump according to the invention along the plane passing through the axes of rotation of each of the screws,
- la figure 2 est une coupe radiale de la pompe conforme à l'invention selon la ligne II-II représentée sur la figure 1.- Figure 2 is a radial section of the pump according to the invention according to line II-II shown in Figure 1.
Selon la figure 1, la pompe à engrenage 1 comprend un corps 10 qui portent deux vis contra-rotatives 2 et 3 d'axes parallèles entre eux. Les extrémités libres 24 et 34 de ces deux vis 2 et 3 coopèrent entre elles par l'intermédiaire de leurs filets hélicoïdaux, à l'intérieure d'une enceinte 11 porté par le corps 10 de sorte à pomper volumétriquement. Notons que seuls les filets de vis de la vis 3 ont été représentés en pointillés sur la figure 1. Comme on le verra plus en détails dans ce qui suit, les extrémités 24 et 34 forment une association d'éléments assimilables à un engrenage bien qu'il n'y ait pas de contact entre les extrémités 24 et 34, ni entre leurs filets.According to Figure 1, the gear pump 1 comprises a body 10 which carry two counter-rotating screws 2 and 3 with axes parallel to each other. The free ends 24 and 34 of these two screws 2 and 3 cooperate with one another by means of their helical threads, inside an enclosure 11 carried by the body 10 so as to pump volumetrically. Note that only the screw threads of screw 3 have been shown in dotted lines in FIG. 1. As will be seen in more detail below, the ends 24 and 34 form an association of elements comparable to a gear although there is no contact between the ends 24 and 34, nor between their threads.
Ainsi chaque vis 2, 3 comporte ainsi plusieurs zones dont la fonction et l'environnement sont différents, que l'on nommera zones A, B, C et D sur les figures 1 et 2 pour plus de clarté.Thus each screw 2, 3 thus comprises several zones whose function and environment are different, which will be called zones A, B, C and D in Figures 1 and 2 for clarity.
Chaque vis 2, 3 possède ainsi :Each screw 2, 3 thus has:
- une extrémité 21, 31 reliée chacune à une motorisation permettant la rotation de la vis sur son axe et ainsi le fonctionnement de la pompe, les deux extrémités 21 et 31 étant localisés dans des logements distincts 12 et 13 portés par le corps 10, correspondant à la zone A,an end 21, 31 each connected to a motorization allowing the rotation of the screw on its axis and thus the operation of the pump, the two ends 21 and 31 being located in separate housings 12 and 13 carried by the body 10, corresponding in zone A,
- une zone d'alimentation B qui fait suite à la zone A dans le sens d'avancement d'un mélange lors de la rotation des vis, dans laquelle les parties 22, 32 de chaque vis 2, 3 tournent dans une chambre commune 4 sans toutefois que les filets des vis soient en contact, l'une des vis 2 ayant dans cette zone un diamètre supérieur à l'autre vis,a feeding zone B which follows zone A in the direction of advancement of a mixture during the rotation of the screws, in which the parts 22, 32 of each screw 2, 3 rotate in a common chamber 4 without, however, the threads of the screws being in contact, one of the screws 2 having in this zone a diameter greater than the other screw,
- une zone C de transmission des flux de matière, succède à la zone B où on a opéré une séparation des flux de mélanges arrivant sur les parties de vis 23 et 33 correspondantes, la chambre 4 s'étant divisée en deux chambres 42 et 43. Dans cette zone les deux vis 2 et 3 ont le même diamètre.- A zone C for the transmission of material flows, follows zone B where there has been a separation of the flows of mixtures arriving on the corresponding parts of screws 23 and 33, the chamber 4 having been divided into two chambers 42 and 43 In this area the two screws 2 and 3 have the same diameter.
- Enfin une zone D de pompage volumétrique dans laquelle les deux extrémités libres 24 et 34 des vis 2 et 3 coopèrent dans une même enceinte qui est l'enceinte 1 1. La zone A correspond donc à la motorisation de la pompe par la motorisation de chacune des vis 2 et 3. Dans cette réalisation, on utilise un seul moteur avec un réducteur spécifique pour entraîner chacune des vis. Ce réducteur impose un jeu angulaire antre les vis 2 et 3 ce qui préserve du contact mécanique leurs extrémités libres 24 et 34. De plus, toujours afin d'éviter tout contact mécanique entre les extrémités 24 et 34, des butées bilatérales mécaniques, non représentées, dans la zone A positionnent axialement les deux vis 2 et 3. Ces dispositions rendent plus fiable et robuste la pompe puisque les extrémités libres des vis 24 et 34 qui constituent une sorte d'engrenage sont motorisées indépendamment l'une de l'autre, aucune des deux extrémités n'entraînant l'autre dans sa rotation.- Finally, a volumetric pumping zone D in which the two free ends 24 and 34 of the screws 2 and 3 cooperate in the same enclosure which is the enclosure 11. Zone A therefore corresponds to the motorization of the pump by the motorization of each of the screws 2 and 3. In this embodiment, a single motor is used with a specific reduction gear to drive each of the screws. This reducer imposes an angular clearance between the screws 2 and 3 which preserves from mechanical contact their free ends 24 and 34. In addition, always in order to avoid any mechanical contact between the ends 24 and 34, bilateral mechanical stops, not shown , in zone A axially position the two screws 2 and 3. These arrangements make the pump more reliable and robust since the free ends of the screws 24 and 34 which constitute a kind of gear are motorized independently of one another, neither of the two ends causing the other to rotate.
La zone B d'alimentation en mélange est elle-même divisée axialement en une zone B' et une zone B" délimitées par la paroi radiale 6, la zone B' étant délimitée par la paroi intérieure 15 du corps 10.The zone B for supplying the mixture is itself axially divided into a zone B 'and a zone B "delimited by the radial wall 6, the zone B' being delimited by the internal wall 15 of the body 10.
La chambre 4 située dans la zone B", est alimenté par un unique orifice d'alimentation 5 disposé dans la zone B' circonférentiellement dans l'entre axes des deux vis 2 et 3 donc au niveau des parties 22' et 32' des deux vis.The chamber 4 located in zone B "is supplied by a single supply orifice 5 disposed in zone B 'circumferentially in between the axes of the two screws 2 and 3 therefore at the level of parts 22' and 32 'of the two screw.
La zone 32' de la vis 3 de plus faible diamètre joue un rôle de galet de gavage pour l'autre vis, cette zone ne présentant aucun filet et son diamètre la mettant au contact de la paroi 15 du corps 10. Le passage du mélange de l'entre axes des deux vis à la chambre 4 est réalisé par un filet 16 taillé dans le corps 10 qui débouche dans la zone B".The zone 32 ′ of the screw 3 of smaller diameter plays the role of a feed roller for the other screw, this zone having no thread and its diameter bringing it into contact with the wall 15 of the body 10. The passage of the mixture between the axes of the two screws to the chamber 4 is produced by a thread 16 cut in the body 10 which opens into the zone B ".
La différence de diamètre dans cette zone B en général permet de faciliter l'alimentation en mélange et ainsi de réaliser le gavage de la pompe.The difference in diameter in this zone B in general makes it possible to facilitate the supply of mixture and thus to make the force-feeding of the pump.
Le passage de la zone B" à la zone C consiste en une division en deux de la chambre 4 et en une partie conique 23 ' de la vis 3 afin de réduire son diamètre à un diamètre identique à celui de la vis 3. Les vis 2 et 3 doivent en effet avoir même torsion et même débit en amont de leurs extrémités libres pour que la pompe puisse fonctionner.The transition from zone B "to zone C consists of a division in two of the chamber 4 and a conical part 23 'of the screw 3 in order to reduce its diameter to a diameter identical to that of the screw 3. The screws 2 and 3 must indeed have same twist and same flow upstream of their free ends so that the pump can operate.
A l'inverse dans la zone D, chaque vis possède une zone conique respectivement 24' et 34' permettant d'augmenter leur diamètre pour ajuster le débit entre les zones C et D.Conversely in zone D, each screw has a conical zone respectively 24 'and 34' making it possible to increase their diameter to adjust the flow rate between zones C and D.
Afin de réaliser une zone D qui soit volumétrique, les filets hélicoïdaux de chaque extrémité de vis 24, 34 doivent coopérer avec l'autre extrémité de vis 34, 24 sans contact en ayant cependant un très faible jeu entre eux et ces extrémités de vis 24 et 34 doivent être telles que leur longueur axiale L respective (figure 2) soit supérieure ou égale à la somme du pas d'hélice des filets et du pas d'hélice multiplié par le nombre de filets de chaque vis multiplié par 2.In order to produce a zone D which is volumetric, the helical threads of each end of the screw 24, 34 must cooperate with the other end of the screw 34, 24 without contact, however having very little play between them and these screw ends 24 and 34 must be such that their respective axial length L (FIG. 2) is greater than or equal to the sum of the thread pitch of the threads and the pitch of the propeller multiplied by the number of threads of each screw multiplied by 2.
On assure ainsi l'étanchéité dans la zone d'admission dans l'enceinte 11, en optimisant alors le nombre de filets hélicoïdaux sur chaque extrémité 24, 34 qui correspondra au minimum à un creux de filet en admission, un en refoulement et un entre les deux.Sealing is thus ensured in the admission zone into the enclosure 11, while then optimizing the number of helical threads on each end 24, 34 which will correspond at least to a hollow of the inlet thread, one in discharge and one between both.
On peut choisir différentes formes pour la structure des filets hélicoïdaux. En particulier, une forme intéressante est d'utiliser des développantes de cercles pour les flancs des filets.You can choose different shapes for the structure of the helical threads. In particular, an interesting form is to use involutes of circles for the sides of the nets.
Pour avoir une pression suffisante au niveau de la pompe et assurer le gavage, il est intéressant de prévoir un surdimensionnement des vis avec un débit dans la zone d'alimentation B supérieur au débit dans la zone de travail C, lui-même supérieur à ce que l'on souhaite obtenir dans la zone D.To have sufficient pressure at the pump and ensure the force-feeding, it is advantageous to provide for an oversizing of the screws with a flow rate in the feed zone B greater than the flow rate in the work zone C, itself greater than this that we want to obtain in zone D.
L'enceinte 11 débouche sur un système convergent vers un orifice de sortie 17 comme on le voit sur la figure 2. The enclosure 11 opens onto a system converging towards an outlet 17 as seen in FIG. 2.

Claims

REVENDICATIONS
1) Pompe volumétrique notamment pour des mélanges caoutchouteux, comportant des moyens de gavage pour refouler la matière vers une enceinte (11) débouchant sur un orifice de sortie (17) et dans laquelle tournent deux vis contra-rotatives (24, 34) engrenant l'une avec l'autre par l'intermédiaire des filets hélicoïdaux respectifs qu'elles portent, la longueur axiale (L) de la zone engrenante de ces vis (24, 34) étant supérieure ou égale à la somme du pas d'hélice des filets et du pas d'hélice multiplié par le nombre de filets de chaque vis multiplié par 2.1) Volumetric pump, in particular for rubber mixtures, comprising force-feeding means for discharging the material towards an enclosure (11) opening onto an outlet orifice (17) and in which two counter-rotating screws (24, 34) rotate. 'with each other via the respective helical threads which they carry, the axial length (L) of the meshing zone of these screws (24, 34) being greater than or equal to the sum of the helical pitch of the threads and helix pitch multiplied by the number of threads of each screw multiplied by 2.
2) Pompe selon la revendication 1, dans laquelle les vis contra-rotatives (24, 34) sont engrenantes sans contact.2) Pump according to claim 1, wherein the counter-rotating screws (24, 34) are meshed without contact.
3) Pompe selon l'une quelconque des revendications 1 ou 2, dans laquelle les deux vis engrenantes (24, 34) sont entraînées directement par un couple moteur identique.3) Pump according to any one of claims 1 or 2, wherein the two meshing screws (24, 34) are driven directly by an identical motor torque.
4) Pompe selon l'une quelconque des revendications 1 à 3, dans laquelle les moyens de gavage sont constitués par deux vis de gavage (2, 3) dont les extrémités libres forment les vis engrenantes (24, 34).4) Pump according to any one of claims 1 to 3, wherein the booster means are constituted by two booster screws (2, 3) whose free ends form the meshing screws (24, 34).
5) Pompe selon la revendication 4 dans laquelle les vis de gavage (2, 3) comporte une zone d'alimentation (B)dans laquelle elles sont montées dans une chambre d'alimentation commune (4), une zone de transmission (C) des flux de matière dans laquelle la chambre commune est divisée en deux chambres distinctes (42, 43) et la zone de pompage volumétrique (D) dans laquelle les chambres distinctes se réunissent pour former l'enceinte (11) dans laquelle tournent les vis engrenantes (24, 34). 6) Pompe selon la revendication 5, dans laquelle une des vis de gavage (3) joue le rôle de galet de gavage (32') pour l'autre vis (2) dans la zone d'alimentation (B).5) Pump according to claim 4 wherein the booster screws (2, 3) comprises a supply zone (B) in which they are mounted in a common supply chamber (4), a transmission zone (C) material flows in which the common chamber is divided into two separate chambers (42, 43) and the volumetric pumping zone (D) in which the separate chambers meet to form the enclosure (11) in which the intermeshing screws rotate (24, 34). 6) Pump according to claim 5, wherein one of the booster screws (3) acts as a booster roller (32 ') for the other screw (2) in the supply zone (B).
7) Pompe selon l'une quelconque des revendications 4 à 6, dans laquelle le diamètre des vis de gavage (2, 3) est déterminé dans les différentes zones d'alimentation (B), de transmission (C) et de pompage (D) de sorte que le débit dans la zone d'alimentation (B) soit supérieur au débit dans la zone de transmission (C) lui-même supérieur au débit dans la zone de pompage (D). 7) Pump according to any one of claims 4 to 6, wherein the diameter of the booster screws (2, 3) is determined in the different supply zones (B), transmission (C) and pumping (D ) so that the flow in the supply zone (B) is greater than the flow in the transmission zone (C) itself greater than the flow in the pumping zone (D).
EP02764840A 2001-08-16 2002-08-09 Displacement pump Withdrawn EP1420933A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0110880 2001-08-16
FR0110880 2001-08-16
PCT/EP2002/008969 WO2003016024A1 (en) 2001-08-16 2002-08-09 Displacement pump

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EP1420933A1 true EP1420933A1 (en) 2004-05-26

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EP02764840A Withdrawn EP1420933A1 (en) 2001-08-16 2002-08-09 Displacement pump

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US (1) US20040161356A1 (en)
EP (1) EP1420933A1 (en)
JP (1) JP2004538182A (en)
CN (1) CN1543395A (en)
WO (1) WO2003016024A1 (en)

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KR101754459B1 (en) * 2012-06-25 2017-07-05 헨케 프라퍼티 유쥐 (하프퉁스베슈렝트) Device for producing polymer pellets, extruded profiles or mouldings and melt pump therefor
CN104153990B (en) * 2014-07-29 2017-05-17 苏州海而仕信息科技有限公司 Submersible water pumping device
FR3058352A1 (en) 2016-11-08 2018-05-11 Compagnie Generale Des Etablissements Michelin VOLUMETRIC EXTRUSION ASSEMBLY FOR MIXTURES OF ELASTOMERS

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WO2003016024A1 (en) 2003-02-27
CN1543395A (en) 2004-11-03
JP2004538182A (en) 2004-12-24

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