RU233278U1 - ELECTRIC GENERATOR FOR POWER SUPPLY SYSTEM OF OWN NEEDS PIPELINE FACILITIES - Google Patents

Abstract

The utility model relates to the field of electric power engineering, namely to methods for providing electric power to auxiliary facilities of pipelines due to the kinetic energy of a liquid or gaseous medium pumped through a pipeline. The technical problem, which the utility model is aimed at solving, consists in reducing the hydraulic resistance to the flow of the transported liquid (gas), created by an electric generator built into the pipeline, increasing its reliability and simplifying the maintenance of its electrical part. The technical result is achieved in that the device - the electric generator - is built into the pipeline by means of an insert made of a dielectric material, for example, fiberglass, on the inner side of the insert, coaxially with it, a hollow rotor of the electric generator is located, consisting of a magnetic circuit that does not have current-carrying parts, for example with installed permanent magnets, and a planetary impeller, the stator of the electric generator is located on the outer side of the insert. 4 fig.

Description

The utility model relates to the field of electric power engineering, namely to methods of providing electric power to facilities for the in-house needs of pipelines intended for pumping liquids and gases.

A promising direction for power supply of pipelines' own needs is the use of kinetic energy of liquid or gaseous medium pumped through the pipeline as the main energy source. Such devices are quite common.

For example, sections of pipes with a diameter of about 1 m with built-in hydroelectric generators, manufactured by Lucid Energy [1], are installed in the city of Portland (USA) in the city water supply system. Turbines with spherical blades are connected to the rotor of the electric generator; when water flows through the water supply, the generator produces electricity, which is used to service the water supply and enters the city power grid. The disadvantage of such devices is the need to dismantle the sections built into the water supply to service the electric generators.

Devices for autonomous power supply of gas and oil pipeline facilities are known. A rotary turbogenerator is proposed, which contains a turbine and a generator mounted inside the main pipeline with high-pressure gas. A swirler, a liquid separation section, and a gas-liquid flow extraction section are installed in series and axially before the turbine inside the main pipeline. The gas-liquid flow extraction section is connected by an additional pipeline to the main flow after the turbine, and a control valve is installed in the additional pipeline [2].

A device is also known – a low-power rotary energy source mounted in a pipeline [3].

The device consists of a copper body, which is cut into the pipeline and fixed to it by connecting couplings, a bypass valve, service couplings, a shut-off valve, a bypass line connected to the body by means of bushings, a rotary turbine fixed in the body by means of quick-release fasteners, a filter fixed to the body by means of a quick-release device, an electrical circuit and an energy consumer.

The disadvantage of these devices is that the turbine and electric generator located inside the pipeline significantly reduce the flow cross-section of the pipeline and, accordingly, increase the hydraulic resistance to the flow.

In addition, the location of the electric generator inside the pipeline determines increased requirements for the generator design in terms of ensuring the tightness and reliability of the winding insulation and the associated possibility of generator failure due to the appearance/development of defects in the insulation located in the liquid medium, as well as the need to use special sealed entries to bring the generator's electrical circuit outside the pipeline.

The main technical problem that the utility model is aimed at solving is to reduce the hydraulic resistance to the flow of transported liquid (gas) created by an electric generator built into the pipeline, to increase its reliability and to simplify the maintenance of its electrical part.

An additional task is to ensure the ability of the device to operate at different viscosity values of the pipeline working medium.

Fig. 1 shows a diagram explaining the essence of the utility model.

The technical result as a solution to the above-mentioned main technical problem is achieved in that the device - the electric generator - is built into the pipeline 1 by means of an insert 2 made of a dielectric material, for example, fiberglass, on the inner side of the insert, coaxially with it, a hollow rotor 3 of the electric generator is located, consisting of a magnetic circuit 3.1, which does not have current-carrying parts, for example with installed permanent magnets, and an impeller 3.2, the blades of which are located along the inner perimeter of the magnetic circuit, the stator 4 of the electric generator is located on the outer side of the insert 2.

The location of the stator 4 of the electric generator with electric windings, from which voltage is removed to power the facilities of the generator's own needs, on the outside of the pipeline (inserts 2) and the planetary design of the impeller 3.2 provide a significant reduction in the hydraulic resistance created by the generator to the flow of liquid (gas) transported through the pipeline in comparison with known solutions (the total cross-sectional area of the rotor, including the impeller, is no more than 5% of the cross-sectional area of the pipeline cavity).

In this case, there is no need to install sealed entries for passing wires through the wall of the pipeline (pipe insert), and the maintenance of the electric part of the electric generator is simplified. The reliability of the electric generator is also increased, since its design does not include electric circuits that are under voltage in a liquid medium. Accordingly, less stringent requirements are imposed on the insulation of the stator of the electric generator.

An additional advantage of the claimed solution is that the dielectric insert 2 prevents the spread of stray currents in the metal wall of the pipeline.

The technical result as a solution to the above-mentioned additional technical problem is achieved in that the geometric parameters of the impeller 3.2 are set depending on the viscosity of the pumped liquid, and the impeller itself is designed with the possibility of replacing it with an impeller with other geometric parameters without changing the design of the magnetic circuit 3.1 of the rotor of the electric generator.

Fig. 1-3 shows graphic images explaining the essence of the utility model.

Fig. 2 and 3 are a drawing and an external view in isometric view, respectively, of an example of a hollow rotor design with a planetary impeller.

Fig. 4 shows an additional bypass line.

In Fig. 1-3 the following notations are used:

1 - pipeline;

2 - insert into the pipeline made of dielectric material;

3 - electric generator rotor;

3.1 - rotor magnetic circuit;

3.2 - rotor impeller;

4 - stator of the electric generator with output windings.

Implementation of a utility model.

The utility model can be used, in particular, for the power supply system of main pipeline valves: ensuring year-round (except for the time of pipeline repair) power supply to all consumers with a specified voltage with a total capacity of up to 10-20 kW - power supply of uninterruptible power supplies based on 24 V batteries - at the nominal value of the flow rate of petroleum liquid through the pipeline. Insert 2 with flange fastening to the pipeline can be built into the pipeline between the flanges of ball valves, shut-off valves and the flanges of the pipeline itself.

To enable maintenance and repair of rotor 3 of the electric generator (with its removal from the pipeline) without stopping the pumping of liquid (gas) into the pipeline, an additional bypass line can be built in parallel to insert 2 with the electric generator, the diagram of which is shown in Fig. 4.

In Fig. 4 the following notations are used:

1 - pipeline;

2 - insert into the pipeline with an electric generator;

5 - safety valve with electric drive (valve);

6 - control valve with electric drive.

The possibility of implementing the utility model does not raise any doubts, since it is based on known principles widely used in the design and serial production of electrical machines (motors and generators, including those with permanent magnets). The authors, in particular, have experience in the design and production of similar electrical machines.

Insert 2 made of dielectric material can be made, for example, of fiberglass. Such products with the required strength at a given pressure are mass-produced.

Sources of information

1. https://www.c-o-k.ru/market_news/turbiny-vyrabatyvayut-elektroenergiyu-pryamo-v-gorodskih-trubah.

2. Patent RU 2746349 C1 IPC F25B 11/00, F01D 15/10, F01D 1/02, B01D 45/12, B01D 45/16, publ. 04/12/2021

3. Patent RU 217266 U1 IPC F01D 15/10, publ. March 24, 2023

Claims (1)

An electric generator built into a pipeline, characterized in that it consists of an insert made of a dielectric material, on the inner side of the insert, coaxially with it, a hollow rotor of the electric generator is located, consisting of a magnetic circuit that does not have current-carrying parts, and an impeller, the blades of which are located along the inner perimeter of the magnetic circuit, the stator of the generator is located on the outer side of the insert.