SU1373886A1 - Centrifugal pump - Google Patents

Abstract

The invention m.6. used for unloading axial forces and reduces the metal consumption of the pump by reducing the size of the disk. The annular disk 10 is located opposite the channels 6 formed on the inner surface of the sleeve 7 of the bearing assembly fixed in the housing 1. The disk 10 is mounted in the housing adjacent to the sleeve on the output side of the channels 6. When the shaft 5 moves, the flow area of the open sections of channels 6 and the direction of the balancing axial force. In addition, in the course of the pump operation, there is an intensive cooling of the working surfaces of the pump and the neck 8 of the shaft of the bearing unit with fluid passing through the channels 6. 1 sludge. i (/: from 00 00 005 ue.f

Description

The invention relates to pump construction and can be used in centrifugal pumps for unloading the pump impeller from the action of axial force.

The purpose of the invention is to reduce metal consumption by reducing the size of the disk.

The drawing shows a centrifugal pump, the longitudinal dimension.

The centrifugal pump includes a housing 1 with suction and discharge zones 2, 3, an impeller 4 housed therein, mounted on a shaft 5 mounted for axial movement in a bearing unit, in which overflow channels 6 are provided, and including a sleeve 7 fixed in housing 1 and the neck 8 of the shaft 5, and a device for unloading from an axial force, comprising a discharge chamber 9 formed by the wheel 4 and the housing 1 and communicated with the discharge zone 3 and through the bypass channels 6 with the suction zone 2 and the annular disk 10 fixed minutes on the shaft 5 opposite the inlet side channels 6. Overflow channels 6 formed on the outer surface of the neck 8 of the shaft 5, and the disk 10 is mounted adjacent the latter.

The centrifugal pump operates as follows.

At the initial moment of operation of the pump, the liquid from the injection zone 3. enters the discharge chamber 9 and freely flows from it through the channels 6 into the suction zone 2. The pressure in the discharge chamber 9 is close to the pressure in the suction zone 2, whereby the axial force is directed towards the bearing assembly. Under the action of this force, the shaft 5 is moved in the same direction. Passing section from 0

R

0

five

thirty

35

0

45

The covered (non-overlapped sleeves 7) portions of the channels 6 formed in the neck 8 of the shaft 5 are reduced, as a result of which the leakage from the chamber 9 decreases and the pressure in it increases. In this case, a balanced axial force arises, directed to the left. When the shaft 5 is moved to the left, the flow area of the open sections of the channels 6 increases, the leakage from the chamber 9 to the suction zone 2 increases, and the pressure in it drops. As a result, an equilibrium axial force arises, directed to the right. In addition, during operation of the pump, there is an intensive cooling of the working surfaces of the sleeve 7 and the neck 8 of the shaft 5 of the bearing assembly with fluid passing through the channels 6.

Claims (1)

Invention Formula A centrifugal pump comprising a housing with suction and discharge zones, an impeller housed therein mounted on a shaft mounted for axial movement in a bearing assembly in which overflow channels are provided and including a sleeve fixed in the housing and a shaft neck and device for unloading from a axial force, which includes a unloading chamber formed by the wheel and the body and communicated with the discharge zone and through the bypass channels with the suction zone, and an annular disk fixed on the shaft The input side of the channel, characterized in that, in order to reduce metal consumption by reducing the dimensions of the disk, the bypass channels are made on the outer surface of the shaft journal, and the disk is mounted adjacent to the latter.