EP0027077B1 - Pompe compacte actionnée par moteur électrique - Google Patents

Pompe compacte actionnée par moteur électrique Download PDF

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Publication number
EP0027077B1
EP0027077B1 EP80401383A EP80401383A EP0027077B1 EP 0027077 B1 EP0027077 B1 EP 0027077B1 EP 80401383 A EP80401383 A EP 80401383A EP 80401383 A EP80401383 A EP 80401383A EP 0027077 B1 EP0027077 B1 EP 0027077B1
Authority
EP
European Patent Office
Prior art keywords
motor
chamber
seal
housing
shaft
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
Application number
EP80401383A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0027077A1 (fr
Inventor
Pierre Pressaco
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.)
CESSIONE;SOCIETE DES CABLES DU MANS S.A.
Original Assignee
DBA SA
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 DBA SA filed Critical DBA SA
Publication of EP0027077A1 publication Critical patent/EP0027077A1/fr
Application granted granted Critical
Publication of EP0027077B1 publication Critical patent/EP0027077B1/fr
Expired legal-status Critical Current

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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
    • 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
    • F04D29/086—Sealings especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/60—Fluid transfer
    • F05D2260/602—Drainage
    • F05D2260/6022—Drainage of leakage having past a seal

Definitions

  • the invention relates to a device forming a pump actuated by an electric motor, of a very compact design requiring in particular a new type of seal placed between the hydraulic circuit of the pump and said electric motor, and more particularly a device forming an automatic pump. for windshield washer used in a motor vehicle.
  • the invention relates more specifically to a device forming a pump actuated by an electric motor, of the type comprising a first chamber having a liquid inlet and a liquid outlet, a discharge means, such as an impeller or the like, being provided for forcing said liquid from said inlet to said outlet, and a second chamber encapsulating an electric motor, the delivery means being mechanically coupled to the shaft of the electric motor, said first and second chambers being adjacent and essentially separated by a seal made of material elastically compressible, comprising a static sealing portion, substantially peripheral, and a dynamic sealing portion, substantially central, defining a shaft passage through which said shaft of said motor passes, the first chamber being defined by a first housing part and the second chamber being defined at least partially by a second housing part comprising s means for receiving the engine, the two housing parts being mutually assembled to form the device.
  • a device of this kind is described in document DE-A-2 748 165.
  • the seal separating the pump chamber from the motor housing is slightly compressed during assembly, that is to say at time of assembly of the shells, to allow it to play a static sealing role; however, the mounting of these shells is unreliable insofar as the axial locking of the motor is achieved by positive stops (constituted by shoulders of the housing) carried respectively by the shells.
  • the assembly is therefore as follows: we introduce the motor inside one of the shells with the seal and the rotor in place on the axis of the engine and we close the housing by slightly compressing the seal (to make it play its sealing role) until the two axial faces of the motor come into contact with the shoulders.
  • the shells are permanently secured at the level of their overlapping parts by bonding or welding.
  • the need to keep the two shells in contact with the two axial ends of the motor throughout the assembly of the shells by gluing or welding is disadvantageous for a farbrication chain in large series.
  • Gluing or welding is in itself a time-consuming method of assembly, but it is the only one which can in fact be reasonably used in connection with the two-shoulder system, since a rapid assembly arrangement, as for example means cooperating by embedding, cannot guarantee (given the molding tolerances of the shells) both a secure immobilization of the engine and a sufficient compression of the seal allowing it to play its role of static sealing.
  • the invention makes it possible to solve the drawbacks of devices with two shells of the type defined above and in particular to use snap-shaped connections for assembling the shells by means of a new type of seal.
  • the device forming a pump actuated by an electric motor of the type defined above is characterized in that the two housing parts are mutually assembled by form of snap connections, and in that that a spring means is inserted and placed under compression, during assembly, between the seal and the motor and constitutes the pump side the only means for immobilizing the motor inside the second chamber between an end zone axial thereof and the spring means.
  • the device represented in FIG. 1 comprises a plastic casing constituted by the fitting of two parts 11 and 12.
  • the casing part 11 is shaped to define a first chamber 13 provided with a liquid inlet 14, upper, and a liquid outlet 15, lower.
  • the housing part 12 defines the essentials of a second chamber 16 housing an electric motor 17, the shaft 18 protrudes inside the first chamber 13 through a seal 19 of compressible material.
  • a discharge means constituted in the example described by an impeller 20, or the like, is mounted on the shaft 18. This impeller therefore defines with the first chamber 13 a kind of centrifugal pump since, when it is driven in rotation by the motor 17, liquid is sucked in from the inlet 14 and discharged towards the outlet 15 situated substantially in the radial extension of the said impeller 20.
  • a flexible conduit (not shown) is connected to the outlet 15 and connected to a use circuit leading for example to the ejection nozzles directed towards the windshield and possibly the rear window of a vehicle, if the device is used in a windshield washer installation, in accordance with the purpose immediately aimed at the invention.
  • the inlet 14 is engaged in the bottom wall of a liquid tank 21, partially shown in Figure 1, so that the centrifugal pump described above is naturally primed permanently as long as the tank 21 contains enough liquid.
  • the housing part 11 has an annular shoulder 25 which marks the limit of the first chamber 13.
  • the seal 19 bears against this shoulder by means of a thrust washer 26.
  • the housing part 11 extends beyond the 'shoulder 25 by a tubular portion 27, which defines a part of the second chamber 16 and whose outer diameter corresponds to the inner diameter of the housing portion 12, in which the portion 27 is engaged and locked by the snap-fit connections 28, allowing instant mounting.
  • the motor 17 has a generally cylindrical shape and the internal diameter of the portion 27 corresponds to the external diameter of the motor 17 so that the portion 27 plays, at least approximately, the role of centering member for the motor 17
  • Centering ribs 29 are also provided inside the housing part 12, just as a boss 30 or the like projecting relative to the bottom wall of the motor 17 is engaged in a corresponding cavity 31 of the housing part 12 to ensure, as far as possible, a relatively precise positioning of the motor inside the device.
  • the seal 19 is completely molded in an elastically compressible material, such as rubber. It is housed inside the portion 27 and bears against the shoulder 25, so that said first and second chambers are adjacent and essentially separated by the seal 19.
  • This seal (apart from a certain number of protrusions 32 protruding inside the second chamber 16 and whose function will be analyzed in detail below) has the general shape of a relatively thick disc whose outside diameter corresponds substantially to the inside diameter of the portion 27. The whole of the however, the gasket is slightly compressed when mounted both radially and in thickness.
  • a static sealing portion 35 substantially peripheral, and a dynamic sealing portion 36, substantially central intended to ensure sealing at the level of the shaft 18 and therefore shaped to define a shaft passage 37 normally crossed by the shaft 18 of the motor 17.
  • the center line 18a symbolizes the position of the shaft 18, when the seal 19 is in position in the portion 27.
  • the static sealing portion 35 we see that it comprises two external peripheral beads 38, 39, continuous, extending radially outward relative to the axis 18a and spaced parallel one of the another in a direction parallel to this axis.
  • the cylindrical lateral surface 40 of the seal which is between these two beads has a diameter corresponding substantially to the internal diameter of the portion 27, so that the beads 38 and 39 will necessarily be compressed during assembly to guarantee a certain seal.
  • a continuous peripheral groove 41 is formed in said static sealing portion 35, in the vicinity of the bead 38. This improves the flexibility of the compressible material in the vicinity of the bead 38.
  • the static sealing portion 35 comprises also a continuous bead 42 extending parallel to the direction of the axis 18a and directed towards the first chamber 13, when the seal is in its mounting position. In this way, after mounting, this bead 42 will be deformed in compression against the thrust washer 26, itself in abutment on the shoulder 25.
  • the dynamic sealing portion 36 is shaped so as to have two continuous internal peripheral flanges 45, 46, extending radially inward of the shaft passage 37. These internal flanges are spaced parallel to the one of the other in a direction parallel to the axis 18a. These two beads 45 and 46 therefore define two annular throttles centered on the axis 18a and of the same diameter. Of course, the diameter of these two throttles is less than the diameter of the shaft 18, to ensure a suitable seal at the latter. It is especially advantageous to provide two contact zones spaced from one another along the shaft 18, between the latter and the seal 19, as is the case thanks to the two beads 45 and 46.
  • the intermediate portion of the seal located between said static and dynamic sealing portions includes in particular a decoupling groove 50, extending relatively deep in the thickness of the seal 19, to give more flexibility to this middle portion and avoid, as much as it may be possible that the deformations necessary for assembly; in one of the sealing portions does not cause harmful stresses in the other portion, likely to affect the sealing efficiency.
  • the circular groove 48 can also be considered as a decoupling groove, given its relatively large depth.
  • the protrusions 32 protruding after mounting in the second chamber 16 came integrally with the seal 19 and distributed substantially in circular symmetry all around the axis 18a. Their length is sufficient to come crashing partially against the motor frame 17 at the time of assembly of the housing parts 11 and 12. All of these protrusions therefore form a sort of spring interposed and mounted in compression between the rest of the seal 19 and the motor 17, to immobilize the latter inside the second chamber 16.
  • a protective disc 51 is fixed on the shaft 18 so as to rotate with it in the second chamber 16, between the seal 19 and the motor 17. Furthermore, a liquid discharge orifice 52 is formed in the side wall of this second chamber, this orifice preferably being located at the lower part of the housing considering the normal mounting position illustrated in FIG. 1 and substantially in the radial extension of the protective disc 51.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP80401383A 1979-10-04 1980-09-30 Pompe compacte actionnée par moteur électrique Expired EP0027077B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7924711 1979-10-04
FR7924711A FR2466644A1 (fr) 1979-10-04 1979-10-04 Pompe compacte actionnee par moteur electrique perfectionnements aux dispositifs selecteurs de programmes pour les recepteurs radio-electriques

Publications (2)

Publication Number Publication Date
EP0027077A1 EP0027077A1 (fr) 1981-04-15
EP0027077B1 true EP0027077B1 (fr) 1984-02-01

Family

ID=9230304

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80401383A Expired EP0027077B1 (fr) 1979-10-04 1980-09-30 Pompe compacte actionnée par moteur électrique

Country Status (5)

Country Link
EP (1) EP0027077B1 (es)
JP (1) JPS5656995A (es)
DE (1) DE3066415D1 (es)
ES (1) ES495619A0 (es)
FR (1) FR2466644A1 (es)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2520844A1 (fr) * 1982-02-03 1983-08-05 Chausson Usines Sa Support pour mecanismes divers du genre moto-ventilateurs, compresseurs, pompes et analogues
GB8427606D0 (en) * 1983-11-17 1984-12-05 Bosch Siemens Hausgeraete Pump unit
IT1218569B (it) * 1987-04-22 1990-04-19 Askoll Srl Pompa centrifiga perfezionata per lavatrici, lavastoviglie ed elettrodomestici in genre
ES2020756A6 (es) * 1990-02-05 1991-09-16 Transpar Iberica Sa Bomba impulsora de liquido limpiador para vehiculos automoviles.
FR2658567A1 (fr) * 1990-02-16 1991-08-23 Electro Mec Nivernais Motopompe centrifuge.
US5833441A (en) * 1996-06-19 1998-11-10 Itt Automotive Electrical Systems, Inc. Windshield wiper washer motor for use in a vehicle

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1728415A1 (de) * 1965-11-19 1972-08-10 Beteiligungs Ag Haustechnik Pumpe mit Induktionsmotor
US3370608A (en) * 1966-08-12 1968-02-27 Whirlpool Co Liquid handling apparatus with pump means having mount and seal
US3408942A (en) * 1967-05-23 1968-11-05 Crowell Designs Inc Bilge pump
US3576380A (en) * 1969-08-11 1971-04-27 Mccord Corp Motor and pump assembly
DE2748165A1 (de) * 1977-10-27 1979-05-03 Helphos Autolicht Schardmuelle Kleinstkreiselpumpe fuer scheiben- bzw. streuscheiben-waschanlagen von fahrzeugen

Also Published As

Publication number Publication date
JPS5656995A (en) 1981-05-19
FR2466644A1 (fr) 1981-04-10
FR2466644B1 (es) 1983-12-23
EP0027077A1 (fr) 1981-04-15
ES8106042A1 (es) 1981-07-01
ES495619A0 (es) 1981-07-01
DE3066415D1 (en) 1984-03-08

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