SU1753052A1 - Pump plant - Google Patents

Description

one

(21) 4776542/29

(22) 0301.90

(46) 0708.92. Bul №29

(75) GN Palshin and A A Malts

(56) USSR Author's Certificate GF 158753, cl. F 04 D 17/08, 1962.

UK Patent No. 1197498, Cl, F 04b 15/00, published 1970. (54) PUMPING INSTALLATION

(57) Utilization-hydro-engineering, regulation of pump performance by air intake. SUMMARY OF THE INVENTION A device for controlling the performance of a dynamic pump is made in the form of a curved tube 7, one end of which has an opening in the form of a slot on a cylindrical surface and is placed vertically in the hopper 1, and the other end is placed in the upper part of the suction nozzle 2, while blockage is prevented. tube cuts with solids and wear. 1 il.

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The invention relates to dynamic pumping units with capacity control, eliminating abnormalities in operation, and can be used in a unit with a dynamic pump operating in a continuous dehumidification of variable capacity, for example, with a hook pump P of a hydraulic power plant hydraulic ash removal system, where ash and slag is abrasive. inclusions are formed in a variable quantity and must be immediately transported at a rate that prevents its settling.

Pumping units with capacity control are known that exclude the possibility of overfilling of the hopper and exposure of the working xpesa.

A pessnap installation is known, which contains a bunker connected to the pump suction inlet, the installation is equipped with a tube, the upper end of which is drawn above the maximum level of liquid in the bunker and provided with a plurality of holes in the wall of the tube located along the tube from maximum to minimum liquid level in the bunker, and the lower end of the tube is known to be in the suction port of the pump, in the center of its cross section.

IZVRSTMZYA installation for pumping gas, liquid and steam is inoperable for pumping pulp with solid abrasive inclusions, as the individual holes in the tube can not be larger than the size of the solid particles of the pulp and will tightly clog the proportional particles, and the lower end of the tube, brought into the core of the suction flow the pipe will be subject to increased abrasive wear and may cause a blockage in the suction pipe, as it immediately halves the linear size of the passage of the suction pipe.

The purpose of the invention is to increase reliability when pumping among hard abrasive inclusions so that it becomes possible to use a pump unit with a capacity control that does not abnormally, and when operating in a hydraulic ash removal system of a thermal power plant.

The goal is achieved by the fact that in the controller, made in the form of a pipe with a vertical suction end in the bunker and horizontal - in the suction port of the pump, instead of a vertical row of holes in the wall of the suction end of the pipe, the horizontal end extends the tube is wound along the suction nozzle not in the center of the section, but in its upper part.

The drawing shows a diagram of a pump unit with an automatic capacity control.

The pump installation has a hopper 1, a suction nozzle 2, a pump snail 3, an impeller 4, an oal 5 wheel, a pressure nozzle b, a regulating pipe 7,

The regulator tube 7 connects the surface of the liquid in the hopper 1 to the upper part of the cavity of the suction nozzle 2 and forms a channel for introducing a controlled amount of air into the fluid flow. For

ensuring the self-suction of air through the regulator pipe 7, the loss of pressure in the fluid flow in the area d of the suction pipe 2 and the dynamic pressure at the end of the regulator pipe in total exceed

static pressure of liquid b from bunker 1 within the limits of the regulated performance of the Nesos from the minimum with a pressure a to a microchip with a pressure c.

Vgpsyvayushchy end of a pipe regulator

7 has a vertical slit extending upwards, partially flooded with liquid within the range of a change from level to s. The area of the slot is equal to the cross section of the pipe regulator 7. Section of the pipe regulator 7

enough to pass the amount of air that is needed for the greatest reduction in pump performance at tmm the liquid level in the hopper 1

Pump installation works as follows.

The capacity of the pump is automatically set according to the level of the liquid in the hopper.

The deviation of the level in the bunker from steady down reduces the flow of fluid through the submerged part of the slot into the coarse reheater, increases the air supply, reduces the density of the fluid (emulsion) in the pump, lowers the pressure at the pump output, reduces the pump performance and, with unchanged fluid supply to the bunker The level rises and recovers.

Change in fluid supply to the hopper

changes the level of fluid in the bunker and the pump capacity varies according to this level; the mode of the pump is stabilized at any flow of fluid to the bunker.

Since the solid particles of the pulp can be wedged only along the width of the slot, one size, while they remain free along the height of the slot,

then full jamming does not occur when

The turbulent state of the pulp in the bunker, which is specially organized so that the solid particles are always in a suspended state.

The location of the horizontal section of the regulator pipe in the upper part of the pulp flow in the suction nozzle best contributes to the reduction of its abrasive wear and limits the patency of the suction nozzle for large pieces of pulp least of all.

Reliable performance of the dynamic pump performance regulator when pumping medium with hard abrasive inclusions eliminates the possibility of overfilling the bunker, exposing the impeller, the occurrence of water hammering that destroys the pump, and reduces the power consumption of the pump unit.

Claims (1)

Invention Formula A pump installation comprising a dynamic pump, the suction inlet of which is connected to the bunker, and a device for controlling the performance of the pump in the form of a curved tube, one end of which, having an opening on a cylindrical surface, is placed vertically in the bunker and the other in the suction nozzle, characterized in that, in order to increase reliability when pumping the medium with solid inclusions by preventing clogging of the holes in the tube and wear the latter, the hole in the tube is made in the form of a slot, and the curtain end of the tube is placed in the upper part of the suction nozzle.