Expansion tank capable of preventing internal leakage

Abstract

The present invention discloses an expansion tank comprises metal barrel made up of an upper barrel body and a lower barrel body, a plastic lining located inside the upper barrel body, an elastic diaphragm located inside the plastic lining, an inner metal ring located inside the elastic diaphragm, and an outer metal ring located between the upper barrel body and the plastic lining. Wherein, a lower ring section of the elastic diaphragm and the lower ring section of the plastic lining are located between the inner metal ring and the outer metal ring, with the inner metal ring and the outer metal ring clamping the lower ring section of the elastic diaphragm and the lower ring section of the plastic liner.

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