SU1100431A1 - Centrifugal pump for abrasive liquids - Google Patents

Abstract

CENTRIFUGAL PUMP FOR ABRASIVE LIQUIDS, comprising a housing and an impeller mounted thereon on the shaft, the shaft having a seal,. placed in a chamber connected by means of supply and discharge channels, respectively, with the injection and suction cavities, characterized in that, in order to increase the reliability and service life of the shaft seal, in the case between the impeller and the chamber, there is additionally a conical cavity facing smaller base in the direction of the impeller, the chamber being separated from the conical cavity by a partition that forms an overflow gap with the shaft, the supply channels are made tangential in the direction of rotation of the shaft and They are located on the largest diameter of the conical cavity, and the outlets are connected to the chamber.

Description

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The invention relates to hydraulic machines and can be used in the mining, mining and other industries in the industry for pumping liquids containing abrasive inclusions.

Centrifugal pumps are known for abrasive liquids, in which the zone is supplied before the shaft is compacted with a flushing fluid under pressure exceeding the head pumped by 1-2 kgf / cm W.

The disadvantage of this design is the high consumption of washing liquid (for example, technical water). For Gr type pumps T2 / 8000/71. this flow rate is about 1000.

A centrifugal pump for abrasive liquids is known, comprising a housing and an impeller mounted thereon on the shaft, the shaft having a seal housed in a chamber connected by means of supply and discharge channels, respectively, to the injection and suction cavities. The working fluid from the pressure side of the pump is fed to a separate unit (cyclone separator), which serves to clean it from abrasive inclusions. Separator is a conical chamber, on the largest diameter of which the working fluid is tangentially supplied; concentrate is diverted from the tip of the cone to the pump suction and a clarified liquid C20 is fed from the base (i.e., upwards) into the pump seal chamber.

The disadvantage of this pump is that due to the turbulence in the flow of working fluid at the entrance to the shaft sealing chamber, it is intensively mixed with the washing liquid clarified in a cyclone separator, which reduces the durability of the seal by accelerated abrasive wear.

The purpose of the invention is to increase the reliability and service life of the seal.

This goal is achieved by the fact that in a centrifugal pump for abrasive liquids comprising a housing and an impeller mounted thereon on the shaft, the shaft having a seal housed in a chamber connected by means of fluid inlet and outlet respectively to the injection and suction cavities in the housing between the impeller and the chamber, there is additionally made a conical cavity, facing a smaller base towards the impeller, the chamber being separated from the conical cavity by a partition forming a flow with the shaft hydrochloric slit inlet conductive channels formed in the tangential direction of rotation of the shaft and arranged on naibolschem diameter of the conical cavity, and the exhausts are connected to the chamber.

FIG. I depicts a centrifugal pump design for abrasive fluids; in fig. 2 shows section A-A in FIG. 1. The device comprises a housing 1 and an impeller 3 mounted on the shaft 2, the shaft 2 having a seal 4 placed in a chamber 5 connected via a supply channel 6 and a drain channel 7 respectively to the injection cavity 8 and the suction cavity 9. In case 1 between the impeller 3 and the chamber 5, there is additionally made a conical cavity 10, facing a smaller base 11 in

the side of the impeller 3, the chamber 5 is separated from the conical cavity 10 by a partition 12, which forms an overflow gap 13 with the shaft 13. The feed channels 14 are tangential in the direction of rotation of the shaft 2 and are located on the largest diameter 15 of the conical cavity 10, and the outlets are connected to camera 5.

The device works as follows.

The abrasive fluid from the cavity 8 of the injection enters the supply channels 14, made tangential in the direction of rotation of the shaft 2, and, twisting, enters the conical cavity 10. At the same time, a circular flow occurs at its largest diameter 15. Under the action of centrifugal forces, the abrasive liquid is divided depending on the specific gravity of its components in such a way that the concentration of abrasive in chamber 5 is higher than approximately. The seals of the shaft 2. The liquid with a high content of abrasive is directed from the conical cavity 10 to the impeller 3, and the cleaned through the flow slot 13 to the seal 4 of the chamber 5 and then through the discharge channels 7 enters the suction cavity 9. Thus, the reliability is improved.

and durability of the work of compaction washed by the liquid cleaned from abrasive. The economic effect of introducing the invention at the ore-dressing plants by increasing the durability of compaction and eliminating the supply of washing water to the compaction averages 300 rubles. per year for one pump.

Claims (1)

CENTRIFUGAL PUMP FOR ABRASIVE LIQUIDS, comprising a housing and an impeller mounted in it on the shaft, the shaft having a seal,. placed in a chamber connected by means of fluid inlet and outlet channels respectively to the discharge and suction cavities, characterized in that, in order to increase the reliability and service life of the shaft seal, a conical cavity is additionally made in the housing between the impeller and the chamber, facing the smaller base to the side impeller, wherein the chamber is separated from _horses: cal cavity wall forming the overflow gap with the shaft, the supply channels formed in the tangential direction of the rotation shaft and arranged us at the largest diameter of the conical cavity, and connected to the diverting chamber.