SU1571299A1 - Inclined archimedian screw centrifugal pump - Google Patents

Abstract

The invention can be used in pumps that pump liquid with abrasive inclusions. The purpose of the invention is to increase reliability by reducing abrasive wear. The centrifugal pump includes a housing 1 with a suction nozzle 2 with an annular chamber 3 and an auger (W) 4 located therein with blades (L) 5. At the inlet part W 4, its L 5 are equipped with radial projections and depressions located respectively on the suction side and pumping. Chamber 3 is made in the form of a spiral outlet located behind the inlet part Ш 4 and equipped at the outlet with an ejector device, communicated by channel 10 with the discharge line. The inner diameter of the nozzle 2 at the inlet is larger than the diameter of its section 11 in front of the centrifugal stage (CS) 12 to form a shut-off device 13. Due to the centrifugal forces during the rotation of Ø 4 created by projections and depressions on L 5, solid inclusions are thrown to the periphery of L 5, department the cutter 13 and enter the spiral outlet. The vacuum created in the outlet by an ejector device prevents it from being locked by solid inclusions. The clarified liquid enters the L 5 auger 4 behind its inlet and then into the central heating system 12 and into the discharge line. 1 hp f-ly, 4 ill.

Description

1

but on the suction and discharge side. Chamber 3 is made in the form of a spiral outlet located behind the inlet part of Ш 4 and equipped at the outlet with an ejector device, communicated by channel 10 with the discharge line. The inner diameter of the nozzle 2 at the entrance is made larger than the diameter of its section 11 in front of the centrifugal stage (CS) 12 to form a shut-off device 13. Due to centrifugal forces during the rotation of Ø 4 created by projections and depressions on L 5, solid inclusions are thrown to the periphery of L 5, department a cut-off 3 and enter the spiral outlet. The vacuum created in the outlet by an ejector device prevents it from being locked by solid inclusions. The clarified liquid enters the L 5 auger 4 behind its inlet and then into the central heating system 12 and into the discharge line. 1 h. the item of f-ly, 4 ill.

The invention relates to hydraulic engineering and can be used for pumping fluids with abrasive inclusions.

The purpose of the invention is to increase reliability by reducing abrasive wear. I FIG. 1 shows a screw centrifugal pump, a slit; in fig. 2 shows section A-A in FIG. one; in fig. 3 is a view B in FIG. one; in {fig. 4 shows a section B-B in FIG. .

The screw centrifugal pump comprises a housing 1 with a suction nozzle 2 with an annular chamber 3 and a rarely included auger 4 with blades located therein. On the walking part of the screw 4, its blades 5 are equipped with radial projections b and depressions 7. The projections 6 are located at the suction side, depression 7 is on the discharge side, and the annular chamber 3 is made in the form of a spiral retrac- tion 8 located behind the input part of the screw 4. The spiral outlet 8 at the outlet is equipped with an ejector (a black device 9.

The ejector device 9 can be combined with a channel 10 with an injection line.

The inner diameter of the suction inlet 2 at the inlet can be made larger than the diameter of the section 11 of the inlet in front of the centrifugal stage 12 with the formation of the cutter 13.

The pump works as follows.

During the rotation of the screw 4 with the centrifugal stage 12, the pumped liquid with solid abrasive inclusions enters the suction nozzle 2.

Due to the twist of the suction flow of the blades 5 of the screw 4, as well as under the action of centrifugal forces acting on the inclusion due to the impeller effect from the projections 6 and the hollows 7, solid abrasive particles are thrown to the periphery of the blades 5 of the inlet part of the screw 4. When the liquid moves to the centrifugal stage 12 the abrasive particles are separated by a slam 13

into the annular chamber 3, from where it is carried away through the spiral outlet 8.

With the help of an ejector device 9, a vacuum is created in the spiral outlet 8 at the outlet, which prevents it from being locked with hard solids and improves the conditions for their removal from the flow part of the pump.

The clarified fluid enters the blades 5 of the screw 4 behind its inlet part and further to the centrifugal rung 12, after which it is fed into the injection line.

Application of radially located

projections 6 and depressions 7, performing

impeller function, increases radial

centrifugal floor pressure gradient

strength and separation efficiency of solid

maximum concentration of inclusions

them in the peripheral part of the screw channel 4.

This reduces abrasive wear.

pump, and therefore, increase its reliability.

Equipping the spiral outlet 8 at the outlet with an ejector device 9 reduces the likelihood of its clogging with solid inclusions, which also increases the reliability of the device.

Claims (2)

1. A screw-centrifugal pump comprising a housing with a suction nozzle with an annular chamber and an upstream screw with blades located therein, characterized in that, in order to increase reliability by reducing abrasive wear, the blades are equipped with radial protrusions and depressions at the inlet part of the screw, the protrusions are located on the suction side, and the depression on the suction side and the annular chamber is made in the form of a spiral outlet located behind the entrance part of the auger. 2. A pump according to claim 1, characterized in that the spiral outlet is equipped with ejector device. In id eight FIG. I 6-8