The invention includes a pot body unit, a conduit and a pipe plug. The pot body unit includes an internal pot body provided with a recessed accommodation region, an external pot body utilized to support the internal pot body, a hollow spatial section interlayered between the external pot body and the internal pot body, and a water permeation hole communicated between the accommodation region of the internal pot body and the spatial section. The conduit configured with a hollow channel therein includes a gas inlet end and a gas outlet end that are respectively communicated with an exterior and an interior of the spatial section of the pot body unit. The pipe plug having one end assembled to the gas inlet end of the conduit is utilized to form at least one gas flow path between the channel of the conduit and an outside air thereof.本發明包括有盆體單元、導管及管塞所組成,其中:盆體單元包括有一具凹陷狀容置區域的內盆體、一支撐內盆體用的外盆體、一夾置於外盆體與內盆體之間的中空狀空間區、以及一連通容置區域至空間區之間的滲水孔;一導管,其內形成有一中空狀的通道,該通道的入氣端及出氣端分別連通至盆體單元之空間區的外側及其內部之用;又,一管塞,其一端係組設於導管之入氣端處,且使導管之通道與管塞外側的空氣之間形成有至少一個以上的氣流路徑。1...盆體單元10...內盆體11...外盆體12...空間區13...容置區域2...導管20...通道201...入氣端3...管塞30...頂面區31...接設區32...連通部A...氣流路徑
