SU987190A1 - Vertical sealed pump - Google Patents

Description

(54) VERTICAL SEAL PUMP

one

The invention relates to hydraulic engineering and can be used for pumping high-temperature fluids.

A vertical hermetic pump is known, which contains an electric motor with a shaft, 5 having a channel for evacuating gases from the upper part of the rotor cavity of an electric motor into the suction cavity of the impeller and an auxiliary wheel mounted on the shaft for pumping cooling fluid Q.

The disadvantages of the known pump are low gas removal efficiency at low pressures and the possibility of overheating of the windings and stationary partition of the electric motor .15

The closest to the invention to the technical essence and the achieved result is a vertical sealed pump containing an electric motor with a shaft having axial and radial channels communicated with it to divert gases from the upper part of the rotor cavity of the electric motor into the impeller suction cavity and mounted on the shaft impeller with blades and auxiliary wheels for pumping coolant 2.

The disadvantages of the known pump are relatively low efficiency and reliability due to the impeller operating in a liquid medium and the possibility of a large amount of heat entering the rotor cavity of an electric motor.

The aim of the invention is to increase the efficiency and reliability of the pump.

The goal is achieved by the fact that the impeller and the radial channels of the shaft are placed in the upper part of the rotor cavity above the auxiliary wheel, the impeller is mounted on the shaft with the possibility of axial movement and overlapping of the radial channels in the extreme upper position, the axial blades of the impeller.

FIG. 1 shows a pump, a longitudinal section; in fig. 2 — node 1 in FIG. 1, with the impeller at the top, in FIG. 3 - the same, with the lower arrangement of the impeller.

The vertical sealed pump contains an electric motor 1 with a shaft 2 having axial and radial channels communicating with it, respectively 3 and 4, to divert gases from the upper part 5 of the rotor cavity 6 of the electric motor 1 to the impeller 8 intake cavity 7 and impeller 9 mounted on the shaft 2 with blades 10 and auxiliary wheel 11 for pumping coolant.

The impeller 9 and the radial channels 4 of the shaft 2 are placed in the upper part 5 of the rotor cavity 6 above the auxiliary wheel 11, the impeller 9 is mounted on the shaft 2 with the possibility of axial movement and overlapping of the radial channels 4 in the extreme upper position, and the blades 10 of the impeller 9 are axial.

The electric motor is equipped with a heat exchanger 12. The axial movement of the impeller 9 is limited to the stops 13 and 14. The blades 10 of the impeller 9 are fixed on the hub 15.

Vertical sealed pump works as follows.

When electric motor 1 is turned on, shaft 2 begins to rotate. The impeller 8 mounted on the shaft 2 injects the pumped liquid to the consumer, and the auxiliary wheel 11 circulates the coolant. In the course of operation, gases which accumulate in the upper part 5 of the rotor cavity 6 are released from the cooling liquid, pushing the level of cooling liquid down. While the impeller 9 with axial blades 10 rotates in the fluid, under the action of the lifting force it moves to the extreme upper position, with the radial channels 4 of the shaft 2 being blocked by the hub 15 of the impeller 9 and the connection between the upper part 5 of the rotor cavity 6 and the suction cavity 7 discontinued. As the impeller 9 becomes exposed, the lift force acting on it decreases and it goes down under its own weight.

The radial channels 4 of the shaft 2 are open, and the gas from the upper part 5 of the rotor cavity 6 through the axial channel 3 is discharged into the suction cavity 7 of the impeller 8. As the gas is displaced from the above volume, the liquid level in it rises, the impeller 9 pops up, and its hub 15 again closes the radial channels 4, preventing parasitic flow of fluid between the suction cavity 7 of the impeller 8 and the upper part 5

the rotor cavity 6 of the electric motor 1.

The proposed improvements provide increased efficiency and pump reliability.

Claims (2)

1. USSR author's certificate number 505823, cl. F 04 D 13/06, 1974. 2. USSR author's certificate number 583659, cl. F 04 D 13/06, 1974. w fz 1 ten / FIG. 2