(19)
(11) EP 2 492 511 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
26.08.2015 Bulletin 2015/35

(43) Date of publication A2:
29.08.2012 Bulletin 2012/35

(21) Application number: 11174958.6

(22) Date of filing: 22.07.2011
(51) International Patent Classification (IPC): 
F04D 13/06(2006.01)
F04D 29/58(2006.01)
 F04D 29/12(2006.01)
(84) Designated Contracting States:
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
Designated Extension States:
BA ME

(30) Priority: 24.02.2011 JP 2011038591
24.02.2011 JP 2011038595
24.02.2011 JP 2011038596

(71) Applicant: Torishima Pump Mfg. Co., Ltd.
Takatsuki-shi Osaka 569-8660 (JP)

(72) Inventor:
  • Kimura, Osamu
    Osaka, 569-8660 (JP)

(74) Representative: Eisenführ Speiser 
Patentanwälte Rechtsanwälte PartGmbB Johannes-Brahms-Platz 1
20355 Hamburg
20355 Hamburg (DE)

   


(54) Circulation pump


(57) In a circulation pump for taking in hot water from an intake portion (34) of a pump casing (33) and discharging the hot water from a discharge portion (35) by rotating a rotating shaft (37) to rotate an impeller (40) disposed in the pump casing (33) and for circulating cooling water in a motor casing (10) while cooling the cooling water with a circulating cooling mechanism (43), a hot water inflow preventing means (an external cooling water supply mechanism (48) or a pump (57)) for preventing the hot water in the pump casing (33) from flowing into the motor casing (10) by generating a stream of water in the motor casing (10) at least during warm standby in which the rotating shaft (37) is stopped is provided.







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Search report