(19)
(11) EP 4 067 803 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
26.04.2023 Bulletin 2023/17

(43) Date of publication:
05.10.2022 Bulletin 2022/40

(21) Application number: 20891698.1

(22) Date of filing: 27.11.2020
(51) International Patent Classification (IPC): 
F28F 1/40(2006.01)
 F28F 21/08(2006.01)
(52) Cooperative Patent Classification (CPC):
F28F 1/40; F28F 21/084; F16L 9/006; F28D 1/0477; F28F 13/12; B21C 23/10; B21C 1/02; B21C 37/207
(86) International application number:
PCT/JP2020/044398
(87) International publication number:
WO 2021/107153 (03.06.2021 Gazette 2021/22)
(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

(30) Priority: 29.11.2019 JP 2019217340

(71) Applicant: MA Aluminum Corporation
Tokyo 105-8546 (JP)

(72) Inventors:
  • HARATA Toshihiro
    Susono-shi, Shizuoka 410-1127 (JP)
  • NAKAMOTO Masayuki
    Susono-shi, Shizuoka 410-1127 (JP)
  • OKAWA Takuya
    Susono-shi, Shizuoka 410-1127 (JP)
  • NAKAURA Yusuke
    Susono-shi, Shizuoka 410-1127 (JP)

(74) Representative: Hoffmann Eitle 
Patent- und Rechtsanwälte PartmbB Arabellastraße 30
81925 München
81925 München (DE)

   


(54) INNER SPIRAL GROOVED TUBE WITH EXCELLENT HEAT TRANSFER PERFORMANCE AND HEAT EXCHANGER


(57) An inner spiral grooved tube according to the present invention includes: a tube body; and grooves and fins aligned in an inner circumferential direction of the tube body, wherein the grooves and the fins are formed in a spiral along a longitudinal direction, an outer diameter is 3 mm or more and 10 mm or less, a number of the fins is 30 to 60, made of a metal, a cross sectional shape of each of the fins has a rectangular shape having an apex angle of 0±10°, a ratio h/f is 0.90 or more and 3.40 or less, h being a fin height and f being fin width, a ratio c/f is 0.50 or more and 3.80 or less, c being a fin spacing, and an average of the ratio h/f and the ratio c/f is 0.8 or more and 3.3 or less.