(19)
(11) EP 1 519 053 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.04.2009 Bulletin 2009/15

(43) Date of publication A2:
30.03.2005 Bulletin 2005/13

(21) Application number: 04023215.9

(22) Date of filing: 29.09.2004
(51) International Patent Classification (IPC): 
F04D 29/58(2006.01)
F04D 29/04(2006.01)
 F04D 29/06(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL HR LT LV MK

(30) Priority: 29.09.2003 JP 2003338540

(71) Applicant: NIKKISO CO., LTD.
Shibuya-ku Tokyo 150-8677 (JP)

(72) Inventor:
  • Tani, Norifumi
    Higashimurayama-shi Tokyo 189-8520 (JP)

(74) Representative: Grosse - Schumacher - Knauer - von Hirschhausen 
Nymphenburger Strasse 14
80335 München
80335 München (DE)

   


(54) A submerged pump having a bearing lubricated by discharged fluid


(57) A target fluid discharged from a pump (12) is partially diverted, by a lead-in duct (58), into a housing chamber (49) including a motor (32) therein. A top bearing (50) supporting a motor shaft (36) is placed in the lead-in duct (58), and lubricated by the target fluid flowing through the lead-in duct (58). A top seal (60) is installed downstream from the top bearing (50) in the lead-in duct (58). The top seal (60) has a slight gap from the motor shaft (36) to form a throttle structure which increases a flow resistance. The throttle structure maintains a pressure in an area near the top bearing (50), to thereby suppress presence of gases.







Search report