SU644969A1 - Double-flow labyrinth electric pump - Google Patents

Description

one

The invention relates to the field of pump construction, in particular to labyrinth electric pumps, in which the need arises for balancing axial forces.

A two-flow labyrinth electropump is known, comprising a housing and a rotor mounted therein with the possibility of axial movement with labyrinth augers located at its opposite ends 1.

A disadvantage of the known pump is that an unbalanced axial hydrodynamic force arises on its rotor due to the inaccuracy of the manufacture of the left and right parts of the pump and the non-identity of their output devices.

The purpose of the invention is to increase the service life of the pump by automatically unloading the rotor from axial forces.

This is achieved by the fact that in the case on the discharge side of each screw the flange is installed with a gap relative to the end surface of the latter.

The drawing shows a double-flow labyrinth electric pump, a longitudinal section.

The pump includes a housing I, a rotor 2 with labyrinth screws 3. In the housing 1 on the discharge side of each screw 3 is installed with a gap 4 relative to the end surface 5 of the screw 3, the flange 6. In the case of axial force, the rotor 2 with screws 3 is shifted in the direction of the force, for example on the left. This causes a reduction in the flow area of the gap 4 between the end surface 5 of the screw 3 and the flange b in the right side of the pump and its magnification in the left. Accordingly, the hydraulic resistance at the outlet from the right side of the pump increases and decreases on the left, which leads to an increase in the pressure in the right and a decrease in the pressure in the left part of the pump. The hydrodynamic force acting on each screw in the axial direction is proportional to the area of the screw in cross section and the head generated by this part of the pump.

Since different axial hydrodynamic forces act on the right and left augers 3, the resultant left-to-right hydrodynamic axial force, which balances the axial force that initially caused the rotor 2 to shift to the left. Similarly, the unloading of the rotor occurs under the action of oppositely directed axial flow.

In this way, a flexible pass-through allows for aBTOMaTinFcrrn balance, an axial force on the rotor, which means that it simplifies the technology of pro- duction pumps and increases their service life.

Formula and 3 about b e and e and

A double-flow labyrinth electropump comprising a housing and a rotor mounted therein with the possibility of axial movement with labyrinth cheeks located on its opposite blocks, from l and h and ng, and with the fact that, in order to increase the service life of the pump by automatically unloading the rotor from axial efforts, in the case of the discharge side of each speck is installed with a gap relative to the end surface of the last flaiep. Sources of information taken into account during the examination 1. USSR author's certificate No. 380866, cl. F 04 D 3/02, 1969.

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