Water impeller shaft watertight structure of hot water circulation pump

• 1. Combined structure of impeller shaft and gap plate of hot water circulation pump [P] . 韩国专利： KR960011535U . 1996-04-15

  机译： 热水循环泵叶轮轴与间隙板的组合结构

• 2. Impeller coupling structure of water pump for hot water circulation [P] . 韩国专利： KR960031902U . 1996-10-24

  机译： 用于热水循环的水泵的叶轮联接结构

• 3. Combination of impeller and shaft of hot water circulation pump [P] . 韩国专利： KR970018484U . 1997-05-26

  机译： 叶轮与热水循环泵的轴组合

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