Column sealing member and submerged pump system

Abstract

This invention provides a column seal member and a submersible pump system for suppressing residual gas leakage from cable wiring. The column seal member 2 of this invention includes: a cover plate 3; an intermediate cable 7 electrically connected to an internal cable 15 and an external connection target S6; an intermediate frame 5 hermetically mounted on the cover plate and housing the intermediate cable; a connector 62a mounted on the intermediate frame; and an inlet pipe 81 mounted on the intermediate frame for introducing inactive gas into the interior of the intermediate frame. The internal cable and the intermediate cable are configured to transmit electricity or signals. The intermediate frame includes an outer side frame 51 disposed above the cover plate and a pump side frame 52 disposed below the cover plate. The connector is disposed on the pump side frame, and the interior of the intermediate frame is filled with the aforementioned inactive gas at a predetermined pressure.

Claims

1. A column seal member for sealing the open end of a cylindrical pump column housing a pump immersed in a treatment fluid, the column seal member comprising: a cover plate installed at the open end to block the open end; an intermediate cable electrically connected to an internal cable wired inside the pump column and an external connection target disposed outside the pump column; an intermediate frame hermetically installed on the cover plate to house the intermediate cable; a connector installed on the intermediate frame to electrically connect the intermediate cable to the internal cable; and an inlet tube installed on the intermediate frame to introduce an inactive gas into the interior of the intermediate frame, wherein... The aforementioned internal cable and the aforementioned intermediate cable constitute a means to transmit the power required for the operation of the aforementioned pump or the signal required for the status monitoring of the aforementioned pump. The aforementioned cover plate has a through hole penetrating the aforementioned cover plate in the vertical direction. The aforementioned intermediate frame has: a cylindrical outer side frame disposed above the aforementioned cover plate in a manner surrounding the aforementioned through hole; and a cylindrical pump side frame disposed below the aforementioned cover plate in a manner surrounding the aforementioned through hole. The aforementioned connector is airtight and is disposed on the aforementioned pump side frame in a manner covering the opening at the lower part of the aforementioned pump side frame. The aforementioned cover plate, the aforementioned outer side frame, and the aforementioned pump side frame divide a continuous space for accommodating the aforementioned intermediate cable. The aforementioned continuous space is airtightly isolated from the exterior of the aforementioned cover plate, the aforementioned outer side frame, and the aforementioned pump side frame. The aforementioned continuous space is filled with the aforementioned inactive gas at a predetermined pressure.

2. As in request item 1, the column sealing member, wherein, The aforementioned predetermined pressure is the discharge pressure of the aforementioned pump.

3. The column sealing member of claim 2, comprising: a pressure sensor that senses the pressure inside the aforementioned intermediate frame; and a control device that controls the amount of the aforementioned inactive gas introduced from the aforementioned inlet pipe based on the sensing result of the aforementioned pressure sensor, the aforementioned control device being configured to receive the aforementioned discharge pressure and control the amount of the aforementioned inactive gas in such a way that the aforementioned pressure inside the aforementioned intermediate frame becomes the aforementioned predetermined pressure based on the aforementioned discharge pressure.

4. As in request item 3, the column sealing member, wherein, When the aforementioned pressure inside the aforementioned control device reaches the aforementioned predetermined pressure, the aforementioned inactive gas is stopped from being introduced.

5. A submersible pump system comprising: a pump immersed in a treatment liquid; a cylindrical pump column housing the pump; a column sealing member sealing the open end of the pump column; and an internal cable connected to the pump and wired within the pump column, wherein... The aforementioned column sealing member comprises: a cover plate installed at the aforementioned opening end to block the aforementioned opening end; an intermediate cable electrically connected to the aforementioned internal cable and an external connection target disposed outside the aforementioned pump column; an intermediate frame installed on the aforementioned cover plate to accommodate the aforementioned intermediate cable; a connector installed on the aforementioned intermediate frame to electrically connect the aforementioned intermediate cable to the aforementioned internal cable; and an inlet pipe installed on the aforementioned intermediate frame to introduce inactive gas into the interior of the aforementioned intermediate frame. The aforementioned internal cable and the aforementioned intermediate cable constitute a means to deliver power required for the operation of the aforementioned pump or signals required for monitoring the status of the aforementioned pump. The aforementioned cover plate has a through hole penetrating the aforementioned cover plate in the vertical direction. The aforementioned intermediate frame comprises: a cylindrical outer side frame disposed above the aforementioned cover plate to surround the aforementioned through hole; and a cylindrical pump side frame disposed below the aforementioned cover plate to surround the aforementioned through hole. The aforementioned connector is airtight and disposed on the aforementioned pump side frame to cover the opening at the lower part of the aforementioned pump side frame. The aforementioned cover plate, the aforementioned outer side frame, and the aforementioned pump side frame divide a continuous space to accommodate the aforementioned intermediate cable. The aforementioned continuous space is airtightly isolated from the exterior of the aforementioned cover plate, the aforementioned outer side frame, and the aforementioned pump side frame. The aforementioned continuous space is filled with the aforementioned inactive gas at a predetermined pressure.

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