| 摘要 |
A hydrogen gas discharge apparatus is provided to improve the freezing efficiency of an absorption-type refrigerating machine by preventing the leakage of the refrigerant gas circulating the absorption-type refrigerating machine and by only releasing the hydrogen gas generated in the absorption-type refrigerating machine inside to the outside. The hydrogen gas discharge apparatus is composed of a gas discharging pipe(1), a flare nut(4), hydrogen gas, a flange(11) of the gas discharging pipe screwed up in a union part(31) of a service valve(3) and pressurized by a pressurization surface(41) of the flare nut, and an airtight protrusion(7) protruded in the upper end of the union part to be closely compressed at the linear-contact about the upper end of the union part.
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