Patent ID: 8414032

Claim:
An automatic discharge connection device of a submersible pump, comprising: a submersible pump; a feed pipe receive fluid discharged from a discharge port of the submersible pump; a coupling member fixed to the discharge port of the submersible pump and located between the submersible pump and the feed pipe; and a sealing member having an one end portion inserted in an annular concave portion formed on an inner circumference of the coupling member, the sealing member providing a seal between the coupling member and the feed pipe, wherein a width of the concave portion in an axial direction of the sealing member is larger than a width in the axial direction of the sealing member of the one end portion of the sealing member inserted in the concave portion, so that the sealing member is movably disposed in the concave portion in the axial direction of the sealing member, wherein the sealing member includes an extended portion that protrudes towards a center of a hollow of the coupling member, wherein when the sealing member moves towards the feed pipe, at least an end portion of the extended portion enters into the feed pipe such that the end portion is in close contact with an inner circumferential surface of the feed pipe to provide the seal between the coupling member and the feed pipe when the submersible pump is actuated, and wherein the sealing member moves towards the discharge port of the submersible pump and the end portion of the extended portion of the sealing member withdraws from the feed pipe when the submersible pump is stopped.