EP3472468A1 - Pompe a fluide motorisée a réchauffement amélioré - Google Patents
Pompe a fluide motorisée a réchauffement amélioréInfo
- Publication number
- EP3472468A1 EP3472468A1 EP17732855.6A EP17732855A EP3472468A1 EP 3472468 A1 EP3472468 A1 EP 3472468A1 EP 17732855 A EP17732855 A EP 17732855A EP 3472468 A1 EP3472468 A1 EP 3472468A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stator assembly
- container
- pump according
- rotor
- motorized pump
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- 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
- 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
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
Definitions
- the invention relates to the field of electric pumps for managing the flow of fluid. More particularly, it relates to motorized pumps to operate at ambient temperatures that may fall below the melting point of the fluid to be pumped.
- the present invention relates more particularly to the field of urea pumps used in the context of the selective catalytic reduction (SCR or acronym SCR in English) and requiring to operate under temperatures below -20 ° C while the melting point of the mixture is of the order of -10 ° C to -15 ° C.
- SCR selective catalytic reduction
- the selective catalytic reduction can effectively reduce the nitrogen oxide emissions (NOx) of motor vehicles through a redox mechanism combining these NOx with a reducing agent based on urea or ammonia to decomposition, releasing mainly nitrogen and water.
- NOx nitrogen oxide emissions
- this decomposition mechanism is implemented as quickly as possible when starting the vehicle, and even in cold ambient conditions (typically less than -15 ° C), it should be possible to heat up the reducing agent as soon as possible, that is to say make it pass its melting point, so that the fluid can be pumped from a reservoir and be injected to the reduction chamber.
- the document US9273584 proposes to heat a urea tank through the use of flexible resistive tracks which, from a central position in the tank, to be distributed in the tank to create a sheet. Under the action of an electric current, Joule effect, this sheet will heat the urea and allow to pass the melting point and promote a faster pumping.
- this type of device does not quickly heat up the reducing mixture that is still in the pump body. If the reducing agent remains in the solid state in the pump body, although it has become liquid in the tank, pumping can not begin. The activation of the overall mechanism is thus dependent on the heating of the reducing agent in the pump body.
- motorized pump body having, likewise, a container or envelope enclosing the gear pump on the one hand and also the magnetized rotor of an electric motor on the other hand .
- the rotor and pump body assembly is thus completely isolated from the stator of the electric motor.
- the present invention aims to overcome the disadvantages of the state of the art by allowing a faster warming of the reducing agent or, more generally, the solidified fluid inside the container inside which is located the pump mechanism. This is achieved by the clever realization of overmolding of the stator to distribute more quickly the heat generated by the stator coils of the electric motor to the container enclosing the pumping elements and the rotor of the electric motor.
- the method of heating the container is to install, for a time necessary for the liquefaction of the fluid to be pumped, a constant or variable current in the stator coils to promote the thermal diffusion of the power dissipated by the coils by effect Joule to the container through overmolding.
- a container envelope made of an electrically conductive and nonmagnetic material (for example a stainless steel) will make it possible, in case of use of a variable heating current, to complete this heating by heating the envelope thanks to the currents. induced by inductive effect (eddy currents).
- the present invention proposes to perform an overmolding of the stator having a conductivity greater than that of air, overmolding advantageously to fill the space between the teeth of the stator to form a thermal diffusion body to near or in contact with the container.
- This improved diffusion makes it possible to heat the fluid contained in the container more quickly.
- gains in heating time up to a factor of 2 have been observed when compared with an engine not exhibiting such overmolding.
- the invention refers to a motorized pump for pumping a fluid
- a motorized pump for pumping a fluid
- said stator assembly having a set of ferromagnetic sheets forming radially extending teeth defining inter-dental spaces and an inner volume, said teeth carrying, in whole or in part, electrical coils
- said container being housed in said interior volume, hermetically sealed from said stator assembly, and comprising a rotor formed an alternation of magnetic poles, the container being formed of a casing enclosing said rotor, a pumping element actuated by said rotor, and circulation channels of said fluid allowing the circulation of said fluid to and from the pumping element
- the stator assembly has an overmoulding of a plastic material having a coefficient of c thermal onduction greater than that of air, in that said overmolding includes the set of sheets and electric coils and in that it fills the inter-dental spaces.
- the stator assembly is overmoulded before placing the container and said overmolding leaves flush with the ends of the teeth of the stator assembly; but it may be envisaged that the stator assembly is overmoulded before placing the container and the overmolding covers the ends of the teeth of the stator assembly. It may also be envisaged that the stator assembly is overmoulded with the container in place so that the overmolding is in contact with said container.
- overmolding defines a cavity of a complementary section to the outer section of said container.
- the radial distance between the overmolded stator assembly and the container is less than 0.5 mm.
- the thermal conductivity of said plastic material is greater than 0.2 W / m / K.
- the pumping element is a gear pump and the pump is urea for a motor vehicle or a truck.
- the overmolded stator comprises a set of conductive tracks supplying the electric coils, said tracks exiting at one of their ends by a connector formed by said overmoulding.
- These tracks may be located behind the rotor or between the rotor and the inputs / outputs of the pumping element or the overmolded stator assembly has attachment ears and said tracks are positioned at the attachment ears.
- the object of the invention is also to provide a method of mounting a motorized pump as defined above characterized in that the container is positioned and held in place on the stator assembly due to the magnetic force exerted between the rotor and the stator assembly and in that the assembly formed by the container and the overmolded stator assembly is placed and fixed in a housing of the application without additional mounting part.
- Another object of the invention is to provide a method of manufacturing a motorized pump characterized in that it comprises a step of inserting the container within the interior volume defined by the teeth of the stator assembly and a molding step of an overmolding resin having a coefficient of thermal conduction greater than that of air.
- FIG. 1 a general side view of an exemplary embodiment of a pump according to the invention
- FIG. 2 is a view in axial section of an exemplary embodiment of a pump according to the invention
- FIG. 3 is a view in axial section of a particular embodiment of the stator assembly whose poles are flush with the overmoulding, whose connector is arranged parallel to the axis of the stator assembly and whose electrical connection tracks are arranged on the opposite side to the attachment points,
- FIG. 4 is a view in axial section of a particular embodiment of the stator assembly whose poles are flush with the overmoulding, the connector of which is arranged parallel to the axis of the stator assembly and whose electrical connection tracks are arranged on the same side as the attachment points,
- FIG. 5 a view of the pumping mechanism and more specifically of the two gears of which it is formed
- FIG. 6 a side view of the subassembly containing the pumping element
- FIGS. 7a and 7b respectively an exploded view of the pump with its fixing support, and an assembled view of the pump on the fixing support
- FIG. 8 an alternative embodiment where the pump is secured to the stator assembly by overmolding
- FIG. 9 is a view in axial section of a particular embodiment of the stator assembly, the poles of which are covered by the overmoulding, the connector of which is arranged perpendicularly to the axis of the stator assembly and whose electrical connection tracks are arranged on the opposite side to the attachment points,
- FIG. 10 is a cross-sectional view of FIG. 4, Figures 1 1a and 1 1b respectively a perspective view of the stator assembly and a sectional view of a pump according to a particular embodiment using Hall probes for switching the motor.
- Figures 1 and 2 show an external view of the pump according to a first embodiment.
- the pump (1) is constituted, from the outside, of an electric motor formed of a stator assembly (2) overmolded inside which a container (20) is inserted.
- This container (20) comprises in particular an envelope (21) surrounding a pumping element (3), a rotor (6) of the electric motor and channels (16, 17) for circulating the fluid to be pumped.
- the overmolded stator assembly (2) has attachment lugs (4) and an electrical connector (5).
- This connector (5) is here oriented perpendicular to the axis of the pump (1) but it is also possible to envisage an output of the connector in the direction parallel to the axis of the pump (1), as shown in FIG. Figure 3 for example.
- the overmolded stator assembly (2) is formed by a bundle of ferromagnetic sheets (14).
- the overmolded stator assembly (2) also comprises connection tracks (9) also overmolded.
- the connection tracks (9) make it possible to electrically connect the coils (13) of the overmolded stator assembly (2) to the connector (5).
- connection tracks (9) may be located on the opposite side to the opening of the overmolded stator assembly (2), as shown in FIG. 3, or on the same side as the opening of the stator assembly. (2) overmolded as shown in Figure 4. In these Figures 3 and 4, we see defines the interior volume (23) by the stator assembly (2) and wherein is housed the container (20).
- Figure 10 is a sectional view of Figure 4 where one points the inter-dental spaces (24). These are the volumes located between the teeth (19) of the overmolded stator assembly (2). The overmoulding performed fulfills these inter-dental spaces (24). Here the ends of the teeth (19) are flush with the overmolding but it can be envisaged to completely cover the teeth (19) as shown in Figure 9.
- the overmoulding surrounding the ferromagnetic sheets (14) covers the outer surface but leaves exposed the inner surface to promote heat exchange between the stator plates (14) and the container (20).
- the overmolding fills the inter-dental space formed by the ferromagnetic sheets (14) to leave flush with the ends of the teeth (19).
- This rotor (6) is guided by an axis (7) fixed in the upper element (8) of the pump (1) in which the inlet (16) and outlet (17) channels of the fluid are integrated, as visible in Figure 1.
- This same rotor (6) mechanically engages the first gear (10) of the pumping element (3).
- the second gear (1 1) is driven by the first (10) and the two gears (10, 1 1) rotate in the central element (12) of the container (20) in which the pumping cavities (18) of the fluid are created as shown in Figure 5.
- the assembly comprising the electric coils (13), the plates (14) of the magnetic circuit of the stator, the electrical connection tracks (9) and the connections form a single body: the stator assembly (2) overmolded .
- the container (20) which is appreciated an isolated view in Figure 6 and a sectional view in Figure 2, and comprising the rotor (6), formed by a permanent magnet, is an independent set of all stator (2) overmoulded. It is assembled by simple insertion into the overmolded stator assembly (2). The force of attraction between the stator plates (14) and the magnet of the rotor (6) makes it possible to temporarily hold the container (20) in the overmolded stator assembly (2). The mechanical fixing of the container (20) is then performed when the pump (1) is fixed to its support (15) for enclosing the container (20) between the overmolded stator assembly (2) and its support (15).
- the different subassemblies formed by the stator assembly (2) overmolded, the container (20) and the support (15) are shown in exploded view and respectively assembled in Figures 7a and 7b.
- FIGS. 11a and 11b illustrate a printed circuit (26) having at least one magnetosensitive probe (25) for detecting the magnetic field of the rotor (6) to enable control of the electric motor. This is illustrated in FIGS. 11a and 11b.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1655691A FR3052821B1 (fr) | 2016-06-20 | 2016-06-20 | Pompe a fluide motorisee a rechauffement ameliore |
PCT/EP2017/064902 WO2017220475A1 (fr) | 2016-06-20 | 2017-06-19 | Pompe a fluide motorisée a réchauffement amélioré |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3472468A1 true EP3472468A1 (fr) | 2019-04-24 |
Family
ID=57137020
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17732855.6A Pending EP3472468A1 (fr) | 2016-06-20 | 2017-06-19 | Pompe a fluide motorisée a réchauffement amélioré |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3472468A1 (fr) |
FR (1) | FR3052821B1 (fr) |
WO (1) | WO2017220475A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106870360A (zh) * | 2017-04-07 | 2017-06-20 | 湖北大旗液压有限公司 | 一种由铁塑复合材料制成的齿轮泵壳体及其制造方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2916188B1 (fr) | 2007-05-16 | 2011-05-06 | Inergy Automotive Systems Res | Reservoir a uree et embase avec element chauffant integre. |
JP4901838B2 (ja) * | 2008-10-29 | 2012-03-21 | 三菱電機株式会社 | ポンプ及びヒートポンプ式給湯装置 |
ITMI20090188U1 (it) | 2009-06-08 | 2010-12-09 | Fluid O Tech Srl | Assieme di contenimento per una pompa volumetrica |
JP5631236B2 (ja) * | 2011-02-21 | 2014-11-26 | 三菱電機株式会社 | ポンプ及びヒートポンプ装置 |
KR101220393B1 (ko) | 2011-09-20 | 2013-01-09 | 기아자동차주식회사 | 유레아 에스씨알 시스템용 펌프 구조 |
-
2016
- 2016-06-20 FR FR1655691A patent/FR3052821B1/fr active Active
-
2017
- 2017-06-19 WO PCT/EP2017/064902 patent/WO2017220475A1/fr unknown
- 2017-06-19 EP EP17732855.6A patent/EP3472468A1/fr active Pending
Also Published As
Publication number | Publication date |
---|---|
FR3052821B1 (fr) | 2018-06-22 |
FR3052821A1 (fr) | 2017-12-22 |
WO2017220475A1 (fr) | 2017-12-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP3080523B1 (fr) | Dispositif électrique de conditionnement thermique de fluide pour véhicule automobile, et appareil de chauffage et/ou de climatisation associé | |
EP3231071A1 (fr) | Actionneur avec modules statorique et rotorique enrobes | |
EP2896116B1 (fr) | Isolant de bobine apte a recevoir un capteur de temperature, interconnecteur pour stator et support pour capteur de temperature correspondants | |
FR2514582A1 (fr) | Micromoteur electrique sans balais | |
FR2987314A1 (fr) | Dispositif de chauffage electrique de fluide pour vehicule automobile et appareil de chauffage et/ou de climatisation associe | |
FR3034584B1 (fr) | Ensemble comportant une machine electrique tournante positionnee a l'interieur d'une enceinte | |
FR2789530A1 (fr) | Alternateur comportant un passage de ventilation de la surface des bagues collectrices | |
FR3006823A1 (fr) | Machine electrique munie d'un systeme de guidage d'au moins un fil de connexion d'une sonde de mesure et systeme de guidage correspondant | |
EP3472468A1 (fr) | Pompe a fluide motorisée a réchauffement amélioré | |
FR3046507A1 (fr) | Stator pour une machine electrique tournante | |
EP2924854A1 (fr) | Capteur de température pour stator de machine électrique et machine électrique comportant un tel capteur | |
FR3056840A1 (fr) | Machine electrique tournante a configuration etanche | |
WO2016091941A1 (fr) | Vanne de dosage adaptée aux hautes pressions | |
FR2719875A1 (fr) | Perfectionnement pour moteur de pompe hydraulique. | |
FR3105631A1 (fr) | Stator pour moteur électrique | |
FR2966298A1 (fr) | Dispositif porte-balais perfectionne pour demarreur de vehicule automobile | |
EP4169149A1 (fr) | Ensemble comprenant une machine électrique tournante, un connecteur et un module électronique | |
EP3066397A1 (fr) | Dispositif électrique de conditionnement thermique de fluide pour véhicule automobile, et appareil de chauffage et/ou de climatisation associé | |
EP0569306A1 (fr) | Perfectionnement pour moteur électrique et pompe hydraulique équipée d'un tel moteur | |
FR3022406A1 (fr) | Organe de raccordement electrique pour circuit electrique de vehicule | |
EP3520203B1 (fr) | Machine electrique tournante munie d'un interconnecteur a configuration amelioree | |
FR3049127A1 (fr) | Stator a refroidissement fluide pour machine electrique. | |
EP2795276A2 (fr) | Capteur de temperature | |
FR3069737A1 (fr) | Machine electrique tournante munie d'elements d'obturation limitant un rebouclage d'air chaud | |
FR3024635A1 (fr) | Dispositif de commande pour moteur electrique de ventilation d'echangeur |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20181219 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
17Q | First examination report despatched |
Effective date: 20211220 |