RU2282932C2 - Inductive cylindrical pump - Google Patents

Abstract

FIELD: engineering of inductive cylindrical pumps, providing electromagnetic force effect on liquid-metallic heat carrier of working channel.

SUBSTANCE: pump has waterproof body with external inducer positioned on it, containing winding and magnetic duct, waterproof internal inducer with winding and magnetic duct, assembled from split washers of laminated electro-technical steel and internal core, acting as a yoke. In head portion, internal inducer is held on external inducer by means of three distancing means, in tail portion it has sliding support. Through recesses in distancing elements, contacts of three-phased winding of internal inducer are made. Both windings have similar connection circuit. Contacts of windings of internal and external inducers are made through waterproof inputs, mounted in the body. Teeth of magnetic duct and winding coils of external and internal inducers are positioned in strict relation to one another. Working channel is formed by concentrically positioned thin-walled rings of external waterproof inducer and internal waterproof inducer.

EFFECT: increased reliability of operation and efficiency.

2 dwg

Description

Technical field

The invention relates to devices that provide electromagnetic force on a liquid metal, which are widely used in various sectors of the economy, for example in nuclear energy.

State of the art

A well-known induction cylindrical pump (G.A. Baranov and others. "Calculation and design of induction MHD - machines with liquid metal working fluid", Fig.2.3) for pumping liquid metal coolant sodium - potassium, containing three main nodes: stator, fixed rotor and working channel. The stator consists of eight magnetic core packages with grooves for 54 primary primary disk coils. The rotor consists of a core and 24 magnetic core packages drawn from 0.5 mm thick electrical steel and laid in grooves profiled in the core.

The working channel is formed by two concentrically arranged pipes made of stainless steel with a thickness of 2 mm.

The disadvantages of this constructive solution are the leakage of the stator, and hence the windings, i.e. the impossibility of using this pump in the submersible version, and low reliability (failure of one coil due to breakdown to the housing or inter-turn circuit leads to failure of the pump).

A known design of a double-winding pump (US patent No. 4166714), used for pumping a liquid metal coolant through pipelines, containing a core composed of 16 packages of longitudinally-charged electrical steel with an internal winding located inside it, a housing with an external winding and 16 packages of a magnetic circuit and a working channel, formed by concentrically arranged core shell and body shell. To cool the windings, a coolant supply is provided.

The advantages of the mentioned pump, in comparison with a single-winding pump, include higher energy characteristics, as well as higher reliability (the ability of the pump to work when one winding fails).

The disadvantage of this solution is also the leakage of the stator, i.e. the inability to use this pump in a submersible version.

The closest technical solution of the known is an electromagnetic pump according to US patent No. 4166714.

Disclosure of invention

The aim of the present invention is to provide a submersible double-winding pump with high energy characteristics.

The objective of the invention is the creation of sealed external and internal inductors.

The technical result of the invention is to increase the efficiency of the pump, cosφ resource, as well as reliability.

This is achieved by the fact that the pump has two sealed inductors (internal and external). Each inductor has its own winding. The design of the magnetic circuit of the internal inductor makes it technologically simple to arrange the winding coils and connect them together due to the fact that the magnetic circuit consists of two nodes: washers and longitudinally-burnt packages. These packages form an inner core, which is the yoke for magnetic flux closure.

In the input part, the internal inductor through three spacers located at an angle of 120 ° is fixed to the head of the external inductor. Through the penetrations in the spacers, the conclusions of the three-phase winding of the internal inductor are made. The conclusions of the winding from the pump casing are made through pressure glands, due to which the access of air oxygen to the core of the coils and the oxidation of the latter are excluded. This ensures a high resource and reliability of the windings. In the tail part, the internal inductor has a sliding support, due to which compensation of various thermal elongations of the internal and external inductors is provided.

The external and internal inductors have the same geometric parameters (the number of coils, the number of grooves, the number and width of teeth, the coils and teeth of the mentioned inductors are located under each other). Both windings have the same switching circuit. This ensures that the windings are synchronous in phase and obtain high energy characteristics.

Brief Description of the Drawings

The invention is illustrated by drawings, which represent the following:

figure 1 is a longitudinal section of a pump;

figure 2 - section aa;

Figure 1 shows a cylindrical induction pump, consisting of a sealed housing 1, an external inductor, including a winding 2 and a magnetic circuit 3, and a compensation unit 4; an internal inductor, including a winding 5 and a magnetic circuit, which is composed of split washers 6 of charged electrical steel with holes for connecting the coils to each other, and a core 7, which is the yoke, the central coupling rod of the internal inductor 8, spacers 9, movable support 10 and the working channel 11 formed by thin-walled shells 12 and 13, compound 14 and pressure glands 15.

Figure 2 shows the split washers 6, the core 7 of the magnetic circuit.

The implementation of the invention

Induction cylindrical pump operates as follows. A three-phase alternating voltage is supplied to the external and internal windings. The alternating current flowing through the windings creates a total time-varying magnetic field, which induces a current in the liquid metal coolant of the working channel. The induced electric current, interacting with the magnetic field of the inductors, creates a force pushing the liquid metal coolant along the working channel. The increased energy intensity of the pump due to the simultaneous operation of both windings allows to achieve the claimed technical result (to increase the efficiency of the pump, cosφ, as well as the reliability).

The heat generated in the windings and magnetic circuits is removed to the coolant in the working channel and to the coolant outside the pump.

Information sources

1. The electromagnetic pump.

IPC N 02 N 4/20

NKI 417-50

U.S. Patent No. 4,167,714.

2. G.A. Baranov and others.

"Calculation and design of induction MHD - machines with a liquid metal working fluid."

Moscow, Atomizdat, 1978, Fig. 2.3.

Claims (1)

An induction pump comprising a sealed casing with an external inductor enclosed in it with a winding and a magnetic circuit, a thin-walled shell of the working channel with a compensation unit, and an internal sealed inductor containing a winding, a magnetic circuit, the teeth of which are made of split washers of charged electrical steel, a thin-walled facing shell, characterized in that the magnetic circuit of the internal inductor is made with a yoke in the form of longitudinally-bursted packages laid in grooves on the central tie rod ennego inductor.

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