Air enters the desiccator through an annular inlet channel, which is covered by a strip of Polytetrafluorethylene PTFE coated wire mesh to prevent the ingress of rain, dust, insects, etc.
空气进入干燥器之后需通过环形通道，环形通道采用聚四氟乙烯涂层，防止雨水、灰尘和昆虫等进入。
2
Steel wire springs are fixed on a plurality of annular isolated concave grooves, and concave teeth are around the annular isolated concave grooves inside, and well contacted with the power plug.