EP3475572B1 - Motorized fluid pump - Google Patents

Motorized fluid pump Download PDF

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Publication number
EP3475572B1
EP3475572B1 EP17731173.5A EP17731173A EP3475572B1 EP 3475572 B1 EP3475572 B1 EP 3475572B1 EP 17731173 A EP17731173 A EP 17731173A EP 3475572 B1 EP3475572 B1 EP 3475572B1
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EP
European Patent Office
Prior art keywords
rotor
guiding
stator assembly
pump
cavity
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Active
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EP17731173.5A
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German (de)
French (fr)
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EP3475572A1 (en
Inventor
Jonas Monnin
Daniel Sigg
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Sonceboz Automotive SA
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Sonceboz Automotive SA
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Publication of EP3475572A1 publication Critical patent/EP3475572A1/en
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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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings

Definitions

  • the invention relates to the field of electric pumps intended to manage the flow of fluid. More particularly, it relates to motorized pumps whose active pumping member, for example vane pump or internal gear pump, is located inside the rotor of the electric motor.
  • active pumping member for example vane pump or internal gear pump
  • the present invention relates more particularly to the field of automotive vacuum pumps.
  • Automobiles require the presence of a vacuum pump, in particular to enable the operation of components such as the brake booster or various gas circulation valves (turbo for example). In the majority of cases, this vacuum pump remains continuously driven by the automobile's internal combustion engine. This has the disadvantage of a continuous loss of energy at the motor level, even when this vacuum pump is not used.
  • vacuum pumps are often vane type pumps where the pumping member is rotating, eccentric in relation to the pump body.
  • EP1566545A2 discloses a motorized fluid pump according to the preamble of claim 1.
  • the object of the invention is to propose a motorized fluid pump comprising a pump body, an internal pump rotor, an electric motor formed of a wound stator assembly and an external rotor driven by the wound stator assembly, said internal pump rotor being movable in rotation inside the volume of the external rotor, said internal rotor being driven by the external rotor characterized in that the stator assembly is overmolded in a plastic material forming a first cavity for axial and radial guidance of the internal rotor and a first cavity for axial and radial guidance of the external rotor.
  • the pump body has a fluid inlet and outlet as well as circulation channels for said fluid and it is produced in the overmolding of the stator assembly.
  • the pump comprises a cover which has a second cavity for guiding the internal rotor and a second cavity for guiding the external rotor.
  • the pump body has a fluid inlet and outlet as well as circulation channels for said fluid and it is an element attached to the stator assembly. It then has a second cavity for guiding the internal rotor and a second cavity for guiding the external rotor.
  • the rotors can be guided by guide bearings inserted in at least one of said cavities to ensure a sliding surface cooperating with a sliding surface, respectively, of the internal rotor and/or of the external rotor. It can also be produced inside said cavities for guiding the internal rotor and guiding the external rotor by means of sliding surfaces cooperating with sliding surfaces, respectively, of the internal rotor and the external rotor.
  • the cover can be made of plastic material and welded to the overmolded assembly, ensuring the sealing of the pump.
  • the overmolding can advantageously present at least one lug for indexing the pump body on the overmolded stator.
  • the overmolding includes a set of electrical connection tracks connecting the wound stator to a connector opening onto the exterior of the overmolding.
  • FIG. 1 represents an external view of the pump (1) according to an exemplary embodiment.
  • the pump (1) consists, seen from the outside, of a molded stator assembly (2) assembled on a pump body (3).
  • the pump (1) comprises a connector (21) which extends outside the volume defined by the pump body (3), as well as fixing holes (22), typically three in number, to ensure the fixing of the pump on the external interface (not shown) receiving the pump (1).
  • FIG 2 represents the body of the pump (3) which includes the fluid inlet (4) and outlet (5) channels as well as circulation channels for said fluid (not shown).
  • the pump body (3) also comprises a first inner rotor guide cavity (6) and a first outer rotor guide cavity (7), the cavities being cylindrical and the first outer rotor guide cavity (7) being of a diameter generally greater than that of the first guide cavity of the internal rotor (6), as well as a groove (8) for placing an O-ring type seal (9) used to guarantee sealing between the pump body (3) and the overmolded stator assembly (2).
  • FIG. 3 represents a sectional view of the overmolded stator assembly (2) from which its constituents can be distinguished: the electrical coils (12), the sheets (13) of the magnetic circuit, the electrical connection tracks (14) as well as the connector (21 ).
  • the overmolding comprises in its center a second cavity for guiding the internal rotor (15) and a second cavity for guiding the external rotor (16), the cavities being cylindrical and the second cavity for guiding the external rotor (16) being of a diameter generally greater than that of the second guide cavity of the internal rotor (15). It also includes two indexing lugs (11) made directly with the overmolding material, or alternatively by additional attached parts.
  • FIGS. 4a and 4b represent two possible rotor execution variants depending on the type of pumping element chosen.
  • the first variant ( figure 4a ) represents an execution using a vane pump formed by an external rotor (17) on which the magnet (18) of the motor is assembled.
  • the outer rotor (17) is provided with a notch (25) in which there is a vane (19) which drives the inner rotor (20).
  • the second variant ( figure 4b ) represents an execution using a pumping element with internal gearing formed of an external rotor (17) provided with internal teeth on which the magnet (18) of the motor is assembled.
  • the internal rotor (20) has teeth which mesh with the internal teeth of the external rotor (17).
  • the internal rotor (20) is the rotor used directly for compressing the fluid
  • the external rotor (17) is the rotor of the electric motor, rotating the internal rotor (20).
  • THE figures 5a and 5b show the two variants of pumps described previously, respectively with vanes and with internal gearing, integrated into the overmolded stator assembly (2).
  • the internal rotor (20) is guided by the first and second guide cavities (6 and 15), the external rotor (17) being guided by the first and second cavities guide (7 and 16).
  • the overmolded stator assembly (2) and the pump body (3) are joined by screws (24). Sealing is ensured by crushing the seal (9) during assembly. In order to ensure optimized guidance, suitable production tolerances must be ensured between the overmolded stator assembly (2) and the pump body (3).
  • FIG. 7 presents an economical and compact alternative embodiment in which the pump body (3), which includes the fluid inlet (4) and outlet (5) channels as well as circulation channels for said fluid, is directly included in the overmolding extended from the stator.
  • the entirely overmolded construction thus formed makes it possible to envisage closing the pump by a simple cover (23) welded to the overmolded stator assembly (2), cover (23) comprising the second cavities (15, 16) of guiding the internal (20) and external (17) rotor. In this case, the use of a seal is not necessary.
  • the guidance of the internal (20) and external (17) rotors is carried out by the guide cavities (6, 7, 15, 16) at the interface of the respective cylindrical sliding surfaces. It may be considered to use bearings (not shown) attached inside the guide cavities (6, 7, 15, 16) to possibly improve the guide function by limiting friction during rotations.

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

Description

DOMAINE TECHNIQUE DE L'INVENTIONTECHNICAL FIELD OF THE INVENTION

L'invention se rapporte au domaine des pompes électriques destinées à gérer le flux de fluide. Plus particulièrement, elle se rapporte aux pompes motorisées dont l'organe de pompage actif, par exemple pompe à palettes ou pompe à engrenage interne, est situé à l'intérieur du rotor du moteur électrique.The invention relates to the field of electric pumps intended to manage the flow of fluid. More particularly, it relates to motorized pumps whose active pumping member, for example vane pump or internal gear pump, is located inside the rotor of the electric motor.

De manière préférentielle mais non limitative, la présente invention concerne plus particulièrement le domaine des pompes à vide automobile.Preferentially but not restrictively, the present invention relates more particularly to the field of automotive vacuum pumps.

Les automobiles nécessitent la présence d'une pompe à vide, notamment pour permettre le fonctionnement d'organes tels que le servofrein ou différentes vannes de circulation de gaz (turbo par exemple). Cette pompe à vide reste dans la majorité des cas entrainée en continu par le moteur à explosion de l'automobile. Cela présente le désavantage d'une perte d'énergie continue au niveau du moteur, même quand cette pompe à vide n'est pas utilisée.Automobiles require the presence of a vacuum pump, in particular to enable the operation of components such as the brake booster or various gas circulation valves (turbo for example). In the majority of cases, this vacuum pump remains continuously driven by the automobile's internal combustion engine. This has the disadvantage of a continuous loss of energy at the motor level, even when this vacuum pump is not used.

Dans le but de diminuer ces pertes d'énergie en continu, afin de diminuer notamment les émissions CO2 qui y sont liés, il peut être intéressant d'actionner cette pompe à vide de manière discontinue en fonction du besoin, le bilan énergétique s'en trouvant ainsi amélioré. De plus, l'utilisation de plus en plus fréquente de véhicules hybrides, ne présentant pas de rotation continue du moteur d'entrainement du véhicule, implique nécessairement un entrainement autonome. Pour ce faire, l'utilisation d'un moteur électrique commandé est ainsi particulièrement adaptée.In order to reduce these energy losses continuously, in order to reduce in particular the CO2 emissions linked to them, it may be interesting to operate this vacuum pump discontinuously depending on the need, the energy balance will vary accordingly. thus finding it improved. Furthermore, the increasingly frequent use of hybrid vehicles, which do not have continuous rotation of the vehicle's drive motor, necessarily implies autonomous training. To do this, the use of a controlled electric motor is particularly suitable.

ETAT DE LA TECHNIQUE ANTERIEURESTATE OF PRIOR ART

Ces pompes à vide sont souvent des pompes de type à palettes où l'organe de pompage est en rotation, excentré par rapport au corps de pompe.These vacuum pumps are often vane type pumps where the pumping member is rotating, eccentric in relation to the pump body.

Il existe déjà des pompes à vide ou fluide motorisées qui permettent l'entrainement de l'organe de pompage par un moteur électrique. Par exemple, le document WO2015198224 présente une telle pompe dont le rotor extérieur, celui du moteur électrique, entraîne un rotor intérieur excentré, celui de l'organe de pompage, par l'intermédiaire astucieux d'un arbre pivotant lié aux deux rotors, afin de permettre le fonctionnement de la pompe à palettes.There are already motorized vacuum or fluid pumps which allow the pumping member to be driven by an electric motor. For example, the document WO2015198224 presents such a pump whose outer rotor, that of the electric motor, drives an eccentric inner rotor, that of the pumping member, by the clever intermediary of a pivoting shaft linked to the two rotors, in order to allow the operation of the vane pump.

On retrouve le même type de pompes motorisées dans les documents DE102006058980 , WO2009121517 ou WO2010096924 , cités à titre d'exemples non limitatifs.We find the same type of motorized pumps in the documents DE102006058980 , WO2009121517 Or WO2010096924 , cited as non-limiting examples.

Le document EP1566545A2 divulgue une pompe à fluide motorisée selon le préambule de la revendication 1.The document EP1566545A2 discloses a motorized fluid pump according to the preamble of claim 1.

Les pompes de ce type présentent toujours le challenge d'assurer une bonne étanchéité et une bonne efficacité de compression par le respect de tolérances mécaniques axiales fines entre les éléments tournants et les éléments guidants.Pumps of this type always present the challenge of ensuring good sealing and good compression efficiency by respecting fine axial mechanical tolerances between the rotating elements and the guiding elements.

Pour ce faire, l'ensemble des documents de l'art antérieur présente toujours un stator de moteur électrique, un rotor externe (celui du moteur électrique), un rotor interne (celui de l'élément de pompage) et des flasques de guidage assurant, en regard avec les éléments en rotation, l'étanchéité et la bonne efficacité de compression.To do this, all the documents of the prior art always present an electric motor stator, an external rotor (that of the electric motor), an internal rotor (that of the pumping element) and guide flanges ensuring , in relation to the rotating elements, tightness and good compression efficiency.

Néanmoins, on peut formuler plusieurs critiques sur cet assemblage. Tout d'abord, le nombre de composants différents est important ce qui nécessite un assemblage et un coût de réalisation importants. De plus, pour des raisons économiques et mécaniques, le choix des matériaux impose des rotors métalliques, généralement en acier allié, et des flasques en aluminium. Les éléments rotoriques tournant dans les flasques aluminiums imposent, par de mauvais coefficients de frottement intrinsèque, un lubrifiant, le plus souvent de l'huile.However, several criticisms can be made of this assembly. First of all, the number of different components is large, which requires significant assembly and production costs. In addition, for economic and mechanical reasons, the choice of materials requires metal rotors, generally in alloy steel, and aluminum flanges. The rotor elements rotating in the aluminum flanges require, due to poor coefficients of intrinsic friction, a lubricant, most often oil.

EXPOSE DE L'INVENTIONSTATEMENT OF THE INVENTION

Il est dans l'objet de l'invention que de proposer une pompe à fluide motorisée simplifiée, limitant le nombre d'éléments nécessaires et favorisant une limitation des efforts de frottement.It is the object of the invention to propose a simplified motorized fluid pump, limiting the number of elements necessary and favoring a limitation of friction forces.

Il est ainsi proposé la possibilité de réaliser un surmoulage du stator du moteur électrique incluant les guidages des rotors interne et externe.It is thus proposed the possibility of overmolding the stator of the electric motor including the guides of the internal and external rotors.

Il est aussi dans l'objet de l'invention de proposer la possibilité de réaliser le corps de pompe dans ledit surmoulage afin de réaliser un ensemble encore plus compact et limitant d'autant le nombre de composants nécessaires.It is also the object of the invention to propose the possibility of producing the pump body in said overmolding in order to produce an even more compact assembly and thereby limiting the number of necessary components.

Plus particulièrement, l'objet de l'invention est de proposer une pompe à fluide motorisée comprenant un corps de pompe, un rotor interne de pompe, un moteur électrique formé d'un ensemble statorique bobiné et d'un rotor externe entrainé par l'ensemble statorique bobiné, ledit rotor interne de pompe étant mobile en rotation à l'intérieur du volume du rotor externe, ledit rotor interne étant entrainé par le rotor externe caractérisée en ce que l'ensemble statorique est surmoulé dans une matière plastique formant une première cavité de guidage axial et radial du rotor interne et une première cavité de guidage axial et radial du rotor externe.More particularly, the object of the invention is to propose a motorized fluid pump comprising a pump body, an internal pump rotor, an electric motor formed of a wound stator assembly and an external rotor driven by the wound stator assembly, said internal pump rotor being movable in rotation inside the volume of the external rotor, said internal rotor being driven by the external rotor characterized in that the stator assembly is overmolded in a plastic material forming a first cavity for axial and radial guidance of the internal rotor and a first cavity for axial and radial guidance of the external rotor.

Selon une première variante, le corps de pompe présente une entrée et une sortie de fluide ainsi que des canaux de circulation dudit fluide et il est réalisé dans le surmoulage de l'ensemble statorique. Cette solution permet de limiter le nombre de pièces nécessaires à la pompe.According to a first variant, the pump body has a fluid inlet and outlet as well as circulation channels for said fluid and it is produced in the overmolding of the stator assembly. This solution makes it possible to limit the number of parts required for the pump.

Dans ce cas, la pompe comprend un couvercle qui présente une deuxième cavité de guidage du rotor interne et une deuxième cavité de guidage du rotor externe.In this case, the pump comprises a cover which has a second cavity for guiding the internal rotor and a second cavity for guiding the external rotor.

Selon une deuxième variante, le corps de pompe présente une entrée et une sortie de fluide ainsi que des canaux de circulation dudit fluide et il est un élément rapporté sur l'ensemble statorique. Il présente alors une deuxième cavité de guidage du rotor interne et une deuxième cavité de guidage du rotor externe.According to a second variant, the pump body has a fluid inlet and outlet as well as circulation channels for said fluid and it is an element attached to the stator assembly. It then has a second cavity for guiding the internal rotor and a second cavity for guiding the external rotor.

Le guidage des rotors peut être réalisé par des paliers de guidage insérés dans au moins une desdites cavités pour assurer une surface de glissement coopérant avec une surface de glissement, respectivement, du rotor interne et/ou du rotor externe. Il peut aussi être réalisé à l'intérieur desdites cavités de guidage du rotor interne et de guidage du rotor externe par le biais de surfaces de glissement coopérant avec des surfaces de glissement, respectivement, du rotor interne et du rotor externe.The rotors can be guided by guide bearings inserted in at least one of said cavities to ensure a sliding surface cooperating with a sliding surface, respectively, of the internal rotor and/or of the external rotor. It can also be produced inside said cavities for guiding the internal rotor and guiding the external rotor by means of sliding surfaces cooperating with sliding surfaces, respectively, of the internal rotor and the external rotor.

Lorsque le corps de pompe est réalisé dans le surmoulage, le couvercle peut être en matière plastique et soudé à l'ensemble surmoulé, assurant l'étanchéité de la pompe.When the pump body is made in the overmolding, the cover can be made of plastic material and welded to the overmolded assembly, ensuring the sealing of the pump.

Lorsque le corps de pompe est rapporté sur l'ensemble statorique, un joint d'étanchéité est disposé à l'interface du corps de pompe et du stator surmoulé. Dans ce mode de réalisation rapporté, le surmoulage peut avantageusement présenter au moins un ergot d'indexation du corps de pompe sur le stator surmoulé.When the pump body is attached to the stator assembly, a seal is placed at the interface of the pump body and the overmolded stator. In this reported embodiment, the overmolding can advantageously present at least one lug for indexing the pump body on the overmolded stator.

De manière générique et préférentielle, le surmoulage englobe un ensemble de pistes de connexion électrique reliant le stator bobiné à un connecteur débouchant sur l'extérieur du surmoulage.Genericly and preferably, the overmolding includes a set of electrical connection tracks connecting the wound stator to a connector opening onto the exterior of the overmolding.

BREVE DESCRIPTION DES FIGURESBRIEF DESCRIPTION OF THE FIGURES

D'autres caractéristiques et avantages de l'invention ressortiront à la lecture qui suit d'exemples de réalisation détaillés, en référence aux figures annexées qui représentent respectivement :

  • la figure 1, une vue de face d'un dispositif selon un premier mode de réalisation de l'invention,
  • la figure 2, une vue de côté isolée du corps de la pompe selon le premier mode de réalisation,
  • la figure 3, une vue en coupe de l'ensemble statorique surmoulé, selon le premier mode de réalisation,
  • les figures 4a et 4b, des vues de côté isolées du rotor extérieur et intérieur de la pompe dans des exemples de réalisation, respectivement, selon une réalisation à palettes pour la figure 4a et à engrenage interne pour la figure 4b,
  • les figures 5a et 5b, des vues des dispositifs des figures 4a et 4b assemblés dans le stator surmoulé de la figure 3,
  • la figure 6, une vue en coupe du dispositif de la figure 1.
  • la figure 7, une vue en coupe d'une variante d'exécution de la pompe où le surmoulage de la partie statorique englobe le corps de pompe.
Other characteristics and advantages of the invention will emerge from the following reading of detailed examples of embodiment, with reference to the appended figures which represent respectively:
  • there figure 1 , a front view of a device according to a first embodiment of the invention,
  • there figure 2 , an isolated side view of the body of the pump according to the first embodiment,
  • there Figure 3 , a sectional view of the overmolded stator assembly, according to the first embodiment,
  • THE figures 4a and 4b , isolated side views of the outer and inner rotor of the pump in exemplary embodiments, respectively, according to a vane embodiment for the figure 4a and internal gear for figure 4b ,
  • THE figures 5a and 5b , views of the devices figures 4a and 4b assembled in the overmolded stator of the Figure 3 ,
  • there Figure 6 , a sectional view of the device of the figure 1 .
  • there Figure 7 , a sectional view of a variant of the pump where the overmolding of the stator part includes the pump body.

DESCRIPTION DETAILLEE D'UN MODE DE REALISATIONDETAILED DESCRIPTION OF AN EMBODIMENT

La figure 1 représente une vue externe de la pompe (1) selon un exemple de réalisation. La pompe (1) est constituée, vue de l'extérieur, d'un ensemble statorique (2) surmoulé assemblé sur un corps de pompe (3). La pompe (1) comprend un connecteur (21) qui s'étend hors du volume défini par le corps de pompe (3), ainsi que des trous de fixation (22), typiquement au nombre de trois, pour assurer la fixation de la pompe sur l'interface extérieure (non montrée) recevant la pompe (1).There figure 1 represents an external view of the pump (1) according to an exemplary embodiment. The pump (1) consists, seen from the outside, of a molded stator assembly (2) assembled on a pump body (3). The pump (1) comprises a connector (21) which extends outside the volume defined by the pump body (3), as well as fixing holes (22), typically three in number, to ensure the fixing of the pump on the external interface (not shown) receiving the pump (1).

La figure 2 représente le corps de la pompe (3) qui comporte les canaux d'entrée (4) et de sortie (5) du fluide ainsi que des canaux de circulation dudit fluide (non montrés). Le corps de pompe (3) comporte également une première cavité de guidage du rotor interne (6) et une première cavité de guidage du rotor externe (7), les cavités étant cylindriques et la première cavité de guidage du rotor externe (7) étant d'un diamètre généralement supérieur à celui de la première cavité de guidage du rotor interne (6), ainsi qu'une gorge (8) de placement pour un joint de type O-ring (9) servant à garantir l'étanchéité entre le corps de pompe (3) et l'ensemble statorique (2) surmoulé. Deux logements (10), débouchants à la surface en contact avec l'ensemble statorique (2) surmoulé, permettent d'accueillir des ergots (11) de positionnement présents sur l'ensemble statorique (2) surmoulé afin de garantir une indexation précise du corps de pompe (3) avec l'ensemble statorique (2) surmoulé. L'indexation précise peut aussi être réalisée par un seul ergot (11) et par le corps de pompe (3).There figure 2 represents the body of the pump (3) which includes the fluid inlet (4) and outlet (5) channels as well as circulation channels for said fluid (not shown). The pump body (3) also comprises a first inner rotor guide cavity (6) and a first outer rotor guide cavity (7), the cavities being cylindrical and the first outer rotor guide cavity (7) being of a diameter generally greater than that of the first guide cavity of the internal rotor (6), as well as a groove (8) for placing an O-ring type seal (9) used to guarantee sealing between the pump body (3) and the overmolded stator assembly (2). Two housings (10), opening onto the surface in contact with the overmolded stator assembly (2), make it possible to accommodate positioning lugs (11) present on the overmolded stator assembly (2) in order to guarantee precise indexing of the pump body (3) with assembly stator (2) overmolded. Precise indexing can also be achieved by a single lug (11) and by the pump body (3).

La figure 3 représente une vue en coupe de l'ensemble statorique (2) surmoulé dont on distingue ses constituants : les bobines électriques (12), les tôles (13) du circuit magnétique, les pistes de connexion électriques (14) ainsi que le connecteur (21). Le surmoulage comporte en son centre une seconde cavité de guidage du rotor interne (15) et une seconde cavité de guidage du rotor externe (16), les cavités étant cylindriques et la seconde cavité de guidage du rotor externe (16) étant d'un diamètre généralement supérieur à celui de la seconde cavité de guidage du rotor interne (15). Il comporte également deux ergots (11) d'indexation réalisés directement avec la matière du surmoulage, ou alternativement par des pièces additionnelles rapportées.There Figure 3 represents a sectional view of the overmolded stator assembly (2) from which its constituents can be distinguished: the electrical coils (12), the sheets (13) of the magnetic circuit, the electrical connection tracks (14) as well as the connector (21 ). The overmolding comprises in its center a second cavity for guiding the internal rotor (15) and a second cavity for guiding the external rotor (16), the cavities being cylindrical and the second cavity for guiding the external rotor (16) being of a diameter generally greater than that of the second guide cavity of the internal rotor (15). It also includes two indexing lugs (11) made directly with the overmolding material, or alternatively by additional attached parts.

Les figures 4a et 4b représentent deux variantes d'exécution possible de rotor selon le type de l'élément de pompage choisi. La première variante (figure 4a) représente une exécution employant une pompe à palettes formée d'un rotor externe (17) sur lequel est assemblé l'aimant (18) du moteur. Le rotor extérieur (17) est muni d'une encoche (25) dans laquelle se trouve une palette (19) qui entraine le rotor interne (20).THE figures 4a and 4b represent two possible rotor execution variants depending on the type of pumping element chosen. The first variant ( figure 4a ) represents an execution using a vane pump formed by an external rotor (17) on which the magnet (18) of the motor is assembled. The outer rotor (17) is provided with a notch (25) in which there is a vane (19) which drives the inner rotor (20).

La seconde variante (figure 4b) représente une exécution employant un élément de pompage à engrenage interne formé d'un rotor externe (17) muni d'une denture intérieure sur lequel est assemblé l'aimant (18) du moteur. Le rotor interne (20) comporte une denture qui engrène avec la denture intérieure du rotor externe (17).The second variant ( figure 4b ) represents an execution using a pumping element with internal gearing formed of an external rotor (17) provided with internal teeth on which the magnet (18) of the motor is assembled. The internal rotor (20) has teeth which mesh with the internal teeth of the external rotor (17).

Dans tous les cas de réalisation envisageables, le rotor interne (20) est le rotor servant directement à la compression du fluide, et le rotor externe (17) est le rotor du moteur électrique, entrainant en rotation le rotor interne (20).In all possible embodiments, the internal rotor (20) is the rotor used directly for compressing the fluid, and the external rotor (17) is the rotor of the electric motor, rotating the internal rotor (20).

Les figures 5a et 5b montrent les deux variantes de pompes décrites précédemment, respectivement à palettes et à engrenage interne, intégrés dans l'ensemble statorique (2) surmoulé. Comme on l'apprécie sur la figure 6, prenant l'exemple d'une réalisation d'une pompe à palettes, le rotor interne (20) est guidé par les première et seconde cavités de guidage (6 et 15), le rotor externe (17) étant guidé par les première et seconde cavités de guidage (7 et 16). La solidarisation de l'ensemble statorique (2) surmoulé et du corps de pompe (3) est réalisé par des vis (24). L'étanchéité est assurée par l'écrasement du joint (9) lors de l'assemblage. Afin d'assurer un guidage optimisé, il convient d'assurer des tolérances de réalisation adaptées entre l'ensemble statorique (2) surmoulé et le corps de pompe (3).THE figures 5a and 5b show the two variants of pumps described previously, respectively with vanes and with internal gearing, integrated into the overmolded stator assembly (2). As we appreciate it on the Figure 6 , taking the example of an embodiment of a vane pump, the internal rotor (20) is guided by the first and second guide cavities (6 and 15), the external rotor (17) being guided by the first and second cavities guide (7 and 16). The overmolded stator assembly (2) and the pump body (3) are joined by screws (24). Sealing is ensured by crushing the seal (9) during assembly. In order to ensure optimized guidance, suitable production tolerances must be ensured between the overmolded stator assembly (2) and the pump body (3).

La figure 7 présente une réalisation alternative économique et compacte dans laquelle le corps de pompe (3), qui comporte les canaux d'entrée (4) et de sortie (5) du fluide ainsi que des canaux de circulation dudit fluide, est directement inclut dans le surmoulage étendu du stator. De plus, la réalisation entièrement surmoulée ainsi formée permet d'envisager une fermeture de la pompe par un simple couvercle (23) soudé à l'ensemble statorique (2) surmoulé, couvercle (23) comprenant les secondes cavités (15, 16) de guidage du rotor interne (20) et externe (17). Dans ce cas, l'utilisation d'un joint d'étanchéité n'est alors pas nécessaire.There Figure 7 presents an economical and compact alternative embodiment in which the pump body (3), which includes the fluid inlet (4) and outlet (5) channels as well as circulation channels for said fluid, is directly included in the overmolding extended from the stator. In addition, the entirely overmolded construction thus formed makes it possible to envisage closing the pump by a simple cover (23) welded to the overmolded stator assembly (2), cover (23) comprising the second cavities (15, 16) of guiding the internal (20) and external (17) rotor. In this case, the use of a seal is not necessary.

Dans les figures précédentes, le guidage des rotors interne (20) et externe (17) est réalisé par les cavités de guidage (6, 7, 15, 16) à l'interface des surfaces de glissement cylindriques respectives. Il peut être envisagé d'utiliser des paliers (non montrés) rapportés à l'intérieur des cavités de guidage (6, 7, 15, 16) pour éventuellement améliorer la fonction de guidage en limitant le frottement lors des rotations.In the preceding figures, the guidance of the internal (20) and external (17) rotors is carried out by the guide cavities (6, 7, 15, 16) at the interface of the respective cylindrical sliding surfaces. It may be considered to use bearings (not shown) attached inside the guide cavities (6, 7, 15, 16) to possibly improve the guide function by limiting friction during rotations.

Claims (10)

  1. Motorized fluid pump (1) comprising a pump body (3), an inner pump rotor (20), an electric motor formed by a wound stator assembly (2) and an outer rotor (17) driven by the wound stator assembly (2), said inner pump rotor (20) being rotatable within the volume of the outer rotor (17), said inner rotor (20) being driven by the outer rotor (17), characterized in that the stator assembly (2) is overmolded in a plastics material forming a first cavity (6) for axially and radially guiding the inner rotor and a first cavity (7) for axially and radially guiding the outer rotor.
  2. Motorized fluid pump according to claim 1, characterized in that the pump body (3) has a fluid inlet (4) and outlet (5) and flow channels for said fluid and in that it is made as part of the overmolding of the stator assembly (2).
  3. Motorized fluid pump according to claim 1, characterized in that the pump body (3) has a fluid inlet (4) and outlet (5) and flow channels for said fluid, in that it is an element attached to the stator assembly (2) and in that it has a second cavity (15) for guiding the inner rotor and a second cavity (16) for guiding the outer rotor.
  4. Motorized fluid pump according to claim 2, characterized in that it comprises a cover (23) which has a second cavity (15) for guiding the inner rotor and a second cavity (16) for guiding the outer rotor.
  5. Motorized fluid pump according to one of claims 3 or 4,
    characterized in that guide bearings are inserted into at least one of said cavities (6, 7, 15, 16) to provide a sliding surface which cooperates with a sliding surface of the inner rotor (20) and/or of the outer rotor (17) respectively.
  6. Motorized fluid pump according to one of claims 3 or 4,
    characterized in that said cavities (6, 15) for guiding the inner rotor and said cavities (7, 16) for guiding the outer rotor have sliding surfaces which cooperate with sliding surfaces of the inner rotor (20) and of the outer rotor (17) respectively.
  7. Motorized fluid pump according to claim 4, characterized in that the plastics material cover (23) is welded to the overmolded assembly, ensuring the pump (1) is sealed.
  8. Motorized fluid pump according to claim 3, characterized in that a seal (9) is arranged at the interface of the pump body (3) and the stator assembly (2), in a groove (8).
  9. Motorized fluid pump according to claim 3, characterized in that the overmolding has at least one lug (11) for indexing the pump body (3) on the stator assembly (2).
  10. Motorized fluid pump according to claim 1, characterized in that the overmolding includes a set of electrical connection tracks (14) joining the stator assembly (2) to a connector (21) opening onto the outside of the overmolding.
EP17731173.5A 2016-06-27 2017-06-22 Motorized fluid pump Active EP3475572B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1655962A FR3053082B1 (en) 2016-06-27 2016-06-27 MOTORIZED FLUID PUMP
PCT/EP2017/065465 WO2018001873A1 (en) 2016-06-27 2017-06-22 Motorized fluid pump

Publications (2)

Publication Number Publication Date
EP3475572A1 EP3475572A1 (en) 2019-05-01
EP3475572B1 true EP3475572B1 (en) 2024-04-10

Family

ID=56943722

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17731173.5A Active EP3475572B1 (en) 2016-06-27 2017-06-22 Motorized fluid pump

Country Status (3)

Country Link
EP (1) EP3475572B1 (en)
FR (1) FR3053082B1 (en)
WO (1) WO2018001873A1 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005273648A (en) * 2004-02-23 2005-10-06 Aisin Seiki Co Ltd Electric pump
JP4084351B2 (en) * 2004-12-24 2008-04-30 株式会社日立製作所 Motor-integrated internal gear pump and electronic equipment
DE102006058980B4 (en) 2006-12-14 2016-08-04 Hella Kgaa Hueck & Co. Vane pump
ITTO20080260A1 (en) 2008-04-03 2009-10-04 Vhit Spa ROTARY VOLUMETRIC PUMP WITH PALETTE, SUITABLE FOR OPERATION WITH LOW OR NO LUBRICATION
DE10745775T8 (en) 2009-02-26 2013-04-25 Stt Technologies Inc., A Joint Venture Of Magna Powertrain Inc. And Shw Gmbh INTEGRATED ELECTRIC WING OIL PUMP
JP5759740B2 (en) * 2011-02-15 2015-08-05 株式会社山田製作所 Electric oil pump
WO2015198224A1 (en) 2014-06-23 2015-12-30 Vhit S.P.A. Rotary fluid pump

Also Published As

Publication number Publication date
WO2018001873A1 (en) 2018-01-04
EP3475572A1 (en) 2019-05-01
FR3053082B1 (en) 2018-07-13
FR3053082A1 (en) 2017-12-29

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