SU88283A1 - Sumpless centrifugal pump - Google Patents

Description

Existing corrosives of salic-like seals in centrifugal pumps cause a significant leakage of low-viscosity liquids, especially when non-pumping easily evaporating and corrosive liquids.

Known glandless centrifugal pumps, made with an electromagnetic drive, built iHibiM in the pump casing. The short-circuited drive rotor is rigidly connected to the pump impeller and hermetically sealed from the stator by means of a metal casing.

The proposed centrifugal pump differs from the known constructive design, which consists in the fact that, in order to eliminate the leakage of the pumped liquid through the gaps between the shaft and the pump housing with one-sided suction, the shank of the impeller shaft together with the rotor of the asynchronous electric motor mounted on it is enclosed in to the pump casing a metal cup, hermetically isolating the working cavity of the pump from external media.

The drawing shows a centrifugal pump in the longitudinal section.

Squirrel cage rotor

/ asynchronous motor

KSSTK (1

WAH 2. mounted on a vertical on which the impeller 3 is rigidly mounted; the impeller is 3, but the spiral chamber 4 of the housing 5 is mounted on the coca. The shaft end 2 with the rotor / is brought out of the body 5 and overlaps with a thin-walled metal cup 6 made of non-magnetic steel. Glass 6 with flange 7 and proc. (V is attached to the front part of the housing 5 and thereby self-isolates the working cavity of the pump's cornea from the external medium. The electric motor stator 9 is mounted on the outer cylindrical surface of the bowl 6. As a result, the bowl 6 is in a magnetic field. The rotor rotates under the action of a rotating magnetic flux penetrating through the wall of the fixed glass 6.

All rotating parts of the pump, including ball bearings 10, are placed inside the housing 5,

which the suction channel communicates with the suction pipe 11, and the discharge channel with the discharge pipe 12.

With a vertical arrangement of the shaft 2, the gases released from the pumped liquid fill the space between the working cavity of the pump and the cavity of the glass. In this case, the rotor will be in the gas chamber, which will reduce losses from friction in the pump unit, since the liquid will be forced out of the cavity of the glass. Excess fluid that lubricates the ballars is sucked through the channel 13 located in the center of the lower part of the shaft 2.

Subject invention

A shaftless centrifugal pump with an electromagnetic drive embedded in it, whose short-circuited rotor, rigidly connected to the pump impeller, is hermetically sealed from the stator by means of a metal casing, characterized by that. that, in order to eliminate leakage of the pumped liquid through the gaps between the shaft and the pump casing with one-sided suction, the shank of the impeller shaft together with the rotor of the induction motor fixed on it is enclosed in a metallic II glass attached to the pump casing (the working cavity of the pump from environment.