SU55243A1 - Sumpless centrifugal pump - Google Patents

Description

The invention relates to the type of non-stuffing centrifugal pumps driven by an asynchronous motor, the stator of which is hermetically sealed from a squirrel-cage rotor, which is one structural unit with the impeller of the pump.

In the proposed pump, its rotor is freely suspended inside the stator housing of the pump in the environment of the pumped liquid, which serves to lubricate and cool the pump.

The drawing shows a diagram of a shaftless centrifugal pump. A conventional stator 3, 4 of an asynchronous motor is placed on the tube 7 of a non-magnetic material.

Inside the pipe there is a single rotating part of the pump, which simultaneously serves as a short-circuited rotor of an asynchronous motor rotating without bearings, and with an impeller of a two-way pump.

Flat iron rings 12 are screwed onto the bronze bush JO of the rotor with blades P of the impeller, which are, in fact, iron of the rotor of the motor.

Along the edges, rings 13 of well-conducting material (copper, aluminum, etc.) are attached to the iron rings 12. These rings are attached by bolts (not shown in the drawing), and good contact must be ensured, since the rings serve as conductors of the current induced in the rotor. The outer rings 13 have a recess, into which the iron parts 14 screwed on the cast-iron pipes 16 enter. This recess, which serves to center the rotor at the beginning of the movement, is supplied with lubricant (fluid pumped over by the pump) through the channel 15.

The cast-iron pipes 16 are connected to the pipe 7 by a flange connection, and one of the flanges of the pipe 7 is the flange 8 for the convenience of installation made removable.

The ring 9 is a guide device, has a cut to give it springiness and is inserted into the corresponding recess in the pipe, where it is held by its elasticity.

To protect the winding 4 of the stator 5 from getting wet, the entire stator is enclosed in a hermetic box and filled with an insulating mass 5.

The entire pump is for. protection from mechanical damage is closed with an iron casing 17.

When current is turned on in the stator winding, a rotating magnetic flux occurs, which passes through the iron of the stator 5, then through the inter-iron space formed by the pipe 7, the gap between this pipe and the rotor, and closes in the iron of the rotor ring 12.

In a short-circuited rotor, such as a squirrel wheel, where rings 13 serve as closing rings, a current arises and the rotor starts to move. Due to the developing centrifugal force, water or other liquid begins to move along the suction pipes 1, then through the sleeve Yu enters the blades 11 and is ejected through the guide device 9 into the annular gap between the rotor and the pipe 7, from where it enters the discharge pipes 2.

In view of the fact that the rotor has a bilateral suction and a bilateral injection, it is well balanced and is abundantly washed with water (or other pumped liquid) on all sides, it is designed to work without bearings and without lubrication. In general, it itself works as a bearing, and lubrication in it is carried out by the pumped liquid.

The subject matter of the invention.

A shaftless centrifugal pump driven by an asynchronous motor, the stator of which is hermetically sealed from a short-circuited rotor, which is one structural unit with the pump impeller, characterized in that the combined rotor of the latter is freely suspended inside the pump housing in the fluid being pumped, simultaneously serving to cool the pump.

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