EP0068948B1 - Electrically driven motor pump with a flooded rotor - Google Patents
Electrically driven motor pump with a flooded rotor Download PDFInfo
- Publication number
- EP0068948B1 EP0068948B1 EP82401042A EP82401042A EP0068948B1 EP 0068948 B1 EP0068948 B1 EP 0068948B1 EP 82401042 A EP82401042 A EP 82401042A EP 82401042 A EP82401042 A EP 82401042A EP 0068948 B1 EP0068948 B1 EP 0068948B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- motor
- assembly according
- shaft
- rotor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000007788 liquid Substances 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000002783 friction material Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims 3
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 claims 1
- 239000013013 elastic material Substances 0.000 claims 1
- 229920001195 polyisoprene Polymers 0.000 claims 1
- 238000009434 installation Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
- F04D13/0613—Special connection between the rotor compartments
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
- F04D29/126—Shaft sealings using sealing-rings especially adapted for liquid pumps
Definitions
- the invention relates to a pump unit as defined in the preamble of claim 1.
- a pump unit is used in particular to constitute a circulator of a central heating installation or sanitary water.
- the invention makes it possible to dispense with a spring.
- the pump set according to the invention is characterized in that this surface is applied, only by virtue of the axial thrust resulting from the operation of the pump, against a corresponding stationary surface, for example secured to the partition wall between the pump and the motor .
- the invention makes it possible to dispense with the stop means provided for absorbing the axial thrust due to the operation of the pump and arranged inside the motor, because in the group according to the invention these stop means are formed by the transverse surfaces in contact.
- the filling of the engine with the liquid is obtained at standstill because, in this condition there is no axial thrust and there appears a gap between the surfaces normally in contact which is sufficient to ensure rapid filling. This filling can also be obtained even when the surfaces are in contact due to inevitable leaks.
- the examples shown are pump units constituting circulators for central heating installation.
- Each of these groups includes a pump 1 proper for circulating water in the pipes of the installation and a single-phase asynchronous electric motor 2 with a rotor 3 mounted on a shaft 4 and driving the pump 1.
- the rotor 3 is enclosed in a housing 5, one end of which is mounted for sealing, by means of a seal 6, on a sleeve 7 extended outside the housing by a wall 8 perpendicular to the axis 9 of the shaft and constituting, with the sleeve 7 the partition wall between the enclosure of the motor 2 proper and the enclosure of the pump 1.
- the stator 2a is on the other hand outside the housing 5.
- This sleeve 7 has around the bearing 10, axial channels 11 for the introduction of the liquid into the enclosure of the rotor.
- the shaft 4 carries outside the motor 2, that is to say on the side of the sleeve 7 opposite to that which is turned towards the rotor 3, a solid disc 12 made of a flexible material such as rubber.
- This disc 12 has a flat face 13 perpendicular to the axis 9 and directed towards the pump in which is formed an annular housing 14 for a ring 15 made of a friction material such as steel, ceramic or graphite, whose free surface 16 projecting from the face 13 is applied against a contact surface 17 constituting the end surface of another ring 18, also made of steel, ceramic or graphite, housed in an annular groove, centered on the axis 9, of a flange 19 with a cylindrical edge 20 itself housed in a recess 21 of the wall 8 and welded to the latter.
- the surface 13 of the disc 12 is substantially coplanar with the surface 22 of the wall 8 which faces the pump.
- the flange 19 has a central opening 23 centered on the axis 9 and of diameter greater than the diameter of the shaft 4 so that the liquid contained in the pump can access the ring 15 and the ring 18.
- the engine 2 is filled when stopped, when no axial thrust is exerted. In this case, a slight gap is formed between the rings, which allows the passage of water first in the interval between the disc 12 and the sleeve 7, then in the enclosure 5 by passing through the channels. 11 of the sleeve 7.
- the average engine run time is greater than with known groups due to the limitation of exchanges between the pump and the rotor enclosure.
- the axial force exerted on the shaft 4 is in the direction of the arrow F ', that is to say from the pump 1 towards the motor 2.
- the ring 18 ′ is arranged in a housing 30 in the wall 8 which opens onto the face 22 facing the pump.
- the housing 30 has a cylindrical surface with an axis 9 and a bottom 31 parallel to the face 22.
- the solid disc 12 'driven by the shaft 4 carrying the ring 15' and ending with the contact surface 16 'perpendicular to the axis 9 is, in this example, further from the motor than in the example in the figure 1.
- a filter 35 surrounding the shaft 4 and disposed in a housing 36 of smaller diameter than that, 21, housing the flange 20 of the flange 19 (FIG. 1) or that that, 30, housing the ring 18 '( Figure 2).
- This filter 35 being placed upstream of the orifices 11, contributes to preventing particles in suspension in the liquid, which could have passed through the gap between the rings in contact, from entering the enclosure 5 of the rotor 3.
- the fixed ring, 18 or 18 ′ instead of constituting a part attached to the wall 8 or to the bowl 19 integral with this wall, forms a piece in one piece with the said bowl (FIG. 1) or with the actual wall ( Figure 2), thus constituting a boss of the bottom of the bowl or the wall.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Description
L'invention est relative à un groupe motopompe tel que défini dans le préambule de la revendication 1. Un tel groupe motopompe est utilisé notamment pour constituer un circulateur d'une installation de chauffage central ou d'eau sanitaire.The invention relates to a pump unit as defined in the preamble of claim 1. Such a pump unit is used in particular to constitute a circulator of a central heating installation or sanitary water.
Avec un groupe de ce genre, le rotor du moteur électrique étant noyé, il n'est pas nécessaire d'assurer l'étanchéité entre le moteur et la pompe.With a group of this kind, the rotor of the electric motor being submerged, it is not necessary to seal between the motor and the pump.
Cependant les joints ne sont pas totalement absents de la liaison entre la pompe et le moteur.However, the seals are not completely absent from the connection between the pump and the motor.
En effet, pour que le liquide dans lequel est noyé le rotor soit exempt de particules abrasives, et/ou pour éviter la sédimentation, préjudiciables au bon fonctionnement et à la durée de vie du moteur, on prévoit généralement entre pompe et moteur un moyen pour limiter les échanges de liquide entre l'enceinte de la pompe et l'enceinte du rotor. A cet effet dans une réalisation (brevet US 3 366 068) on prévoit un support porté par l'arbre et portant une surface centrée sur l'axe de l'arbre et transversale à ce dernier qui est appliquée grâce à un ressort contre une autre surface.Indeed, so that the liquid in which the rotor is embedded is free of abrasive particles, and / or to avoid sedimentation, detrimental to the proper functioning and to the life of the engine, means are generally provided between pump and engine for limit the exchange of liquid between the pump enclosure and the rotor enclosure. For this purpose in one embodiment (US Pat. No. 3,366,068) a support is provided carried by the shaft and carrying a surface centered on the axis of the shaft and transverse to the latter which is applied by means of a spring against another area.
L'invention permet de se passer de ressort.The invention makes it possible to dispense with a spring.
Le groupe motopompe selon l'invention est caractérisé en ce que cette surface est appliquée, uniquement grâce à la poussée axiale résultant du fonctionnement de la pompe, contre une surface stationnaire correspondante, par exemple solidaire de la paroi de séparation entre la pompe et le moteur.The pump set according to the invention is characterized in that this surface is applied, only by virtue of the axial thrust resulting from the operation of the pump, against a corresponding stationary surface, for example secured to the partition wall between the pump and the motor .
La pression axiale étant ainsi exercée par le fonctionnement même de la pompe il n'est pas nécessaire de prévoir de ressort pour exercer cette pression. En outre l'invention permet de se passer des moyens de butée prévus pour encaisser la poussée axiale due au fonctionnement de la pompe et disposés à l'intérieur du moteur, car dans le groupe selon l'invention ces moyens de butée sont formés par les surfaces transversales en contact.Since the axial pressure is exerted by the very operation of the pump, it is not necessary to provide a spring to exert this pressure. Furthermore, the invention makes it possible to dispense with the stop means provided for absorbing the axial thrust due to the operation of the pump and arranged inside the motor, because in the group according to the invention these stop means are formed by the transverse surfaces in contact.
Le remplissage du moteur par le liquide est obtenu à l'arrêt car, dans cette condition il n'y a pas de poussée axiale et il apparaît un interstice entre les surfaces normalement en contact qui est suffisant pour assurer un remplissage rapide. Ce remplissage peut également être obtenu même lorsque les surfaces sont en contact en raison des fuites inévitables.The filling of the engine with the liquid is obtained at standstill because, in this condition there is no axial thrust and there appears a gap between the surfaces normally in contact which is sufficient to ensure rapid filling. This filling can also be obtained even when the surfaces are in contact due to inevitable leaks.
D'autres caractéristiques de l'invention apparaîtront avec la description de certains de ses modes de réalisation, celle-ci étant effectuée en se référant aux dessins ci-annexés sur lesquels :
- la figure 1 est une vue schématique en coupe axiale d'une partie d'un groupe motopompe selon l'invention, et
- la figure 2 est une vue analogue à celle de la figure 1 pour une variante.
- FIG. 1 is a schematic view in axial section of a part of a motor pump unit according to the invention, and
- Figure 2 is a view similar to that of Figure 1 for a variant.
Les exemples représentés sont des groupes motopompes constituant des circulateurs pour installation de chauffage central.The examples shown are pump units constituting circulators for central heating installation.
Chacun de ces groupes comprend une pompe 1 proprement dite pour faire circuler de l'eau dans les canalisations de l'installation et un moteur électrique 2 asynchrone monophasé avec un rotor 3 monté sur un arbre 4 et entraînant la pompe 1.Each of these groups includes a pump 1 proper for circulating water in the pipes of the installation and a single-phase asynchronous
Le rotor 3 est enfermé dans un boîtier 5 dont une extrémité est montée à étanchéité, grâce à un joint 6, sur un manchon 7 prolongé à l'extérieur du boîtiers par une paroi8 perpendiculaire à l'axe 9 de l'arbre et constituant, avec le manchon 7 la paroi de séparation entre l'enceinte du moteur 2 proprement dit et l'enceinte de la pompe 1. Le stator 2a est par contre à l'extérieur du boîtier 5.The
Au centre du manchon 7 est monté un palier 10 traversé par l'arbre 4 et supportant ce dernier. Ce manchon 7 présente autour du palier 10, des canaux axiaux 11 pour l'introduction du liquide dans l'enceinte du rotor.At the center of the
On se réfère tout d'abord à la figure 1. Dans cet exemple l'effort axial sur l'arbre 4, dû au fonctionnement de la pompe 1, s'exerce dans le sens de la flèche F c'est-à-dire du moteur vers la pompe.We first refer to Figure 1. In this example the axial force on the
L'arbre 4 porte à l'extérieur du moteur 2, c'est-à-dire du côté du manchon 7 opposé à celui qui est tourné vers le rotor 3, un disque plein 12 en une matière souple telle que du caoutchouc. Ce disque 12 présente une face plane 13 perpendiculaire à l'axe 9 et dirigée vers la pompe dans laquelle est ménagé un logement annulaire 14 pour une bague 15 en un matériau de friction tel que de l'acier, de la céramique ou du graphite, dont la surface libre 16 en saillie de la face 13 est appliquée contre une surface de contact 17 constituant la surface d'extrémité d'une autre bague 18, également en acier, céramique ou graphite, logée dans une gorge annulaire, centrée sur l'axe 9, d'un flasque 19 à bord cylindrique 20 lui-même logé dans un chambrage 21 de la paroi 8 et soudé à cette dernière.The
Dans cet exemple la surface 13 du disque 12 est sensiblement coplanaire à la surface 22 de la paroi 8 qui est tournée vers la pompe.In this example, the surface 13 of the
Le flasque 19 présente une ouverture centrale 23 centrée sur l'axe 9 et de diamètre supérieur au diamètre de l'arbre 4 de manière que le liquide contenu dans la pompe puisse accéder à la bague 15 et à la bague 18.The
L'application, pour obtenir l'étanchéité, de la surface 16 contre la surface 17 est obtenue par la poussée axiale s'exerçant sur l'arbre 4 dans le sens de la flèche F en raison du fonctionnement de la pompe 1.The application, to obtain the seal, of the
Le remplissage du moteur 2 est obtenu à l'arrêt, lorsqu'il ne s'exerce aucune poussée axiale. Dans ce cas il se forme un léger interstice entre les bagues, ce qui autorise le passage de l'eau d'abord dans l'intervalle entre le disque 12 et le manchon 7, puis dans l'enceinte 5 en passant à travers les canaux axiaux 11 du manchon 7.The
Même en fonctionnement normal il existe toujours un léger écoulement de liquide entre les surfaces en contact autorisant un transfert de liquide de la pompe vers le rotor. Ce transfert de liquide n'est pas gênant car les particules en suspension dans le liquide se trouvant dans la pompe 1 sont arrêtées par la barrière constituée par les surfaces en contact.Even in normal operation there is always days a slight flow of liquid between the surfaces in contact allowing a transfer of liquid from the pump to the rotor. This transfer of liquid is not annoying because the particles in suspension in the liquid being in the pump 1 are stopped by the barrier constituted by the surfaces in contact.
Au surplus le contact entre les bagues 15 et 18 limite le déplacement axial de l'arbre et il n'est donc pas nécessaire de prévoir d'autre butée à l'intérieur du moteur comme dans les groupes motopompes antérieurement connus.In addition, the contact between the
Enfin la moyenne de temps de bon fonctionnement du moteur est plus importante qu'avec les groupes connus en raison de la limitation des échanges entre la pompe et l'enceinte du rotor.Finally, the average engine run time is greater than with known groups due to the limitation of exchanges between the pump and the rotor enclosure.
Dans l'exemple de la figure 2, l'effort axial qui s'exerce sur l'arbre 4 est dans le sens de la flèche F' c'est-à-dire de la pompe 1 vers le moteur 2.In the example in FIG. 2, the axial force exerted on the
Dans cet exemple la bague 18' est disposée dans un logement 30 de la paroi 8 qui débouche sur la face 22 tournée vers la pompe. Le logement 30 présente une surface cylindrique d'axe 9 et un fond 31 parallèle à la face 22.In this example, the
Le disque plein 12' entraîné par l'arbre 4 portant la bague 15' et se terminant par la surface de contact 16' perpendiculaire à l'axe 9 est, dans cet exemple, plus éloigné du moteur que dans l'exemple de la figure 1.The solid disc 12 'driven by the
Le fonctionnement de ce groupe est le même que celui du groupe représenté sur la figure 1.The operation of this group is the same as that of the group shown in Figure 1.
Dans les deux exemples on peut prévoir, en avant du manchon 7, un filtre 35 entourant l'arbre 4 et disposé dans un logement 36 de plus faible diamètre que celui, 21, logeant le rebord 20 du flasque 19 (figure 1) ou que celui, 30, logeant la bague 18' (figure 2). Ce filtre 35 étant disposé en amont des orifices 11, contribue à empêcher que les particules en suspension dans le liquide, qui auraient pu traverser l'interstice entre les bagues en contact, ne pénètrent dans l'enceinte 5 du rotor 3.In the two examples, it is possible to provide, in front of the
En variante la bague fixe, 18 ou 18', au lieu de constituer une pièce rapportée à la paroi 8 ou à la cuvette 19 solidaire de cette paroi, forme une pièce d'un seul tenant avec ladite cuvette (figure 1) ou avec la paroi proprement dite (figure 2), constituant ainsi un bossage du fond de la cuvette ou de la paroi.As a variant, the fixed ring, 18 or 18 ′, instead of constituting a part attached to the
Claims (9)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8112610 | 1981-06-26 | ||
| FR8112610A FR2508563B1 (en) | 1981-06-26 | 1981-06-26 | ELECTRIC MOTOR PUMP WITH WET ROTOR |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0068948A1 EP0068948A1 (en) | 1983-01-05 |
| EP0068948B1 true EP0068948B1 (en) | 1985-05-15 |
Family
ID=9259914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP82401042A Expired EP0068948B1 (en) | 1981-06-26 | 1982-06-08 | Electrically driven motor pump with a flooded rotor |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0068948B1 (en) |
| DE (1) | DE3263512D1 (en) |
| FR (1) | FR2508563B1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10064717A1 (en) * | 2000-12-22 | 2002-07-11 | Grundfos As | Method for operating a pump set |
| DE10322464A1 (en) * | 2003-05-16 | 2004-12-02 | Ksb Ag | Canned motor pump |
| DE102004048557A1 (en) * | 2004-10-04 | 2006-04-06 | Aweco Appliance Systems Gmbh & Co. Kg | liquid pump |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19800302A1 (en) * | 1998-01-07 | 1999-07-08 | Wilo Gmbh | Centrifugal motor pump with mechanical seal |
| DE102012012443A1 (en) * | 2012-06-22 | 2013-12-24 | Wilo Se | Motor centrifugal pump with a mechanical seal |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR775739A (en) * | 1934-07-11 | 1935-01-08 | Pitch seal for centrifugal pumps | |
| DK109243C (en) * | 1965-09-13 | 1968-04-01 | Smedegaard As | Fluid circulation pump. |
| CH504624A (en) * | 1968-04-11 | 1971-03-15 | Marelli & C Spa Ercole | Electric pump for hot water circulation, with support lubrication liquid |
-
1981
- 1981-06-26 FR FR8112610A patent/FR2508563B1/en not_active Expired
-
1982
- 1982-06-08 DE DE8282401042T patent/DE3263512D1/en not_active Expired
- 1982-06-08 EP EP82401042A patent/EP0068948B1/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10064717A1 (en) * | 2000-12-22 | 2002-07-11 | Grundfos As | Method for operating a pump set |
| DE10322464A1 (en) * | 2003-05-16 | 2004-12-02 | Ksb Ag | Canned motor pump |
| DE10322464A8 (en) * | 2003-05-16 | 2005-04-28 | Ksb Ag | Canned motor pump |
| DE10322464B4 (en) * | 2003-05-16 | 2012-05-03 | Ksb Ag | Canned motor pump |
| DE102004048557A1 (en) * | 2004-10-04 | 2006-04-06 | Aweco Appliance Systems Gmbh & Co. Kg | liquid pump |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3263512D1 (en) | 1985-06-20 |
| FR2508563B1 (en) | 1985-11-08 |
| FR2508563A1 (en) | 1982-12-31 |
| EP0068948A1 (en) | 1983-01-05 |
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