Pump

Abstract

A pump includes a pumping unit including therein an impeller for sucking and discharging a liquid; and a pump case accommodating therein the pumping unit and provided with an inlet for sucking the liquid into the pump and an outlet for discharging the liquid out of the pump. The impeller has an inlet mouth portion of a cylindrical shape that projects towards the pump case, and the pump case has a case inlet portion and an annular recess portion which the inlet mouth portion of the impeller is movably inserted in and is formed at the vicinity of the case inlet portion.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a pump driven by a motor to suck and discharge liquid.BACKGROUND OF THE INVENTION[0002]In a pump mainly used to circulate water while constantly filled up therewith, water may leak through a shaft seal portion. In view thereof, a canned motor pump, for example, has been widely in use, which does not employs a shaft seal structure by adopting a configuration that separates a water flow section having an impeller from a driving mechanism section having a motor.[0003]The canned motor pump is configured such that a rotor integrated with the impeller is accommodated in a partition wall to be sealed thereby without sealing a shaft. The rotor is rotated by a rotating magnetic force, which is generated by a stator disposed outside the partition wall and, acts on the rotor through the partition wall.[0004]Besides, there has been also employed a magnet coupling type electromagnetic drive pump in which a disk-shaped or cylindrical ma...

AI Technical Summary

Benefits of technology

[0010]In view of the foregoing, the present invention provides a pump that can be easily assembled and has a structure for securing a sufficient resistance (flow path resistance or hydraulic resistance) capable of preventing a back flow and leakage of coolant.

[0017]Thus, in accordance with the embodiment of the present invention, it is possible to provide a pump configured to be easily assembled and have a sufficient flow resistance for preventing a back flow or leakage of liquid, thereby enhancing the pump efficiency. Further, by incorporating the aforementioned pump in a liquid supplying apparatus such as a water supplying apparatus, user's convenience in using the liquid supplying apparatus can be improved remarkably.

Problems solved by technology

In a pump mainly used to circulate water while constantly filled up therewith, water may leak through a shaft seal portion.

However, in the self-priming pump disclosed in Reference 1, it takes time to adjust the gap because the gap is controlled by finely adjusting the partition plates at a precise location and then being fixed thereat by mechanical screwing.

Furthermore, this self-priming pump is configured to reduce the amount of water leaking through a single gap, and does not have a sufficient flow resistance.

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