Ships – Building – Freighters
Patent
1993-12-27
1995-05-30
Sotelo, Jesus D.
Ships
Building
Freighters
62240, 165 42, B63B 2508
Patent
active
054192706
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arrangement of a submersible pump. More particularly, this invention relates to a pump for use submerged in the cargo in a ship's tank, for example for circulation of the cargo in the tank and particularly for circulation of the cargo through a cargo refrigeration arrangement which is submerged in the cargo.
Submersible pumps are known for example from NO 123 115, where the whole pump unit, that is to say the pump's drive motor with drive medium conduits, drive shaft and pump rotor ant pump stator, is submerged in the cargo in a ship's tank. By means of a drainage controlled "cofferdam"-system and an associated control system one can protect the cargo by preventing the drive medium, lubricating medium, and the like from being admixed with the cargo medium. Correspondingly the pump and its drive arrangement can be protected by preventing the cargo medium from penetrating the drive medium and the lubricating medium. Pumps of this type are especially designed for discharging cargo from cargo tanks of the ship, in which the pump is submerged. The pump unit has however also been employed in addition for circulation of the cargo medium in the cargo tank, for example in connection with separate heating cycles for heating of the cargo medium or cooling cycles for refrigerating the cargo medium. In such cases there is the possibility of keeping the cargo medium under circulation within the cargo tank, but for special reasons the heating system and the refrigeration system are placed on deck.
With the present invention the aim is a pump which is more particularly designed for circulation of the cargo medium within the cargo tank. The aim is especially a pump which can be used in connection with cooling of the cargo medium in connection with a cargo refrigeration arrangement which is submerged in the tank.
Various proposals have been submitted for circulation arrangements with portions of the circulation conduits together with the pump arranged on deck. In addition, the heating arrangement and the refrigeration arrangements have also been placed on deck. For special use purposes, such a positioning on deck is heat technically unfavourable or directly undesired, for one thing as a consequence of the more or less uncontrolled temperature influence which the circulation medium can be exposed to in the means which are arranged on deck. In addition, large problems can be encountered in achieving sufficiently hermetic transfers between equipment arranged on deck and equipment submerged in the tank. On the other hand problems can be encountered in getting the heating or refrigeration equipment clean in such cases where the heating or refrigeration equipment is submerged in the cargo medium, as a result of problems with the complicated dismantling of the equipment.
According to the invention the aim is to arrange the whole circulation system and the whole pump unit at a level below the upper level of the cargo medium in the cargo tank, so that the circulation of the cargo medium via the pump can be carried out entirely below deck at an arbitrary level in the cargo tank, so that the temperature regulation of the cargo medium can be carried out in a better controlled manner by simple means in the cargo tank and furthermore so that the equipment is relatively easy to dismantle.
At the same time the objective is to provide a simple constructional solution for preventing the mixing together of cargo medium and drive medium/lubricating medium.
In addition, the aim is a solution with a short shaft connection between the rotor of the pump and the drive arrangement of the pump. More particularly, the aim is a solution where the drive arrangement of the pump can be handled separately in an especially simple manner on mounting and dismounting, so that contamination of the cargo medium with the drive medium/lubricating medium can be avoided. Furthermore the objective is that on mounting and dismounting, the rotor of the pump can be handled together with the drive arrangement and separately relative to
REFERENCES:
patent: 3149472 (1964-09-01), McCall et al.
patent: 3304877 (1967-02-01), Carter et al.
Frank Mohn Fusa A/S
Hand Francis C.
Sotelo Jesus D.
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