Borehole electric generator

FIELD: electricity.

SUBSTANCE: invention relates to electric engineering and may be used in power generators of borehole hardware. Borehole electric generator includes fastening unit, rotor with hydro turbine impeller and, at least, one group of permanent magnet which has cinematic link with hydro turbine and associated induction windings. Cinematic link with permanent magnet groups is arranged through conversion mechanism of rotary motion to reciprocal motion, which can be arranged as driven disk installed on rotor, driving disk installed on axis and spring abutting on axis end. Holes are provided inside fastening unit. Fastening unit is located in front, middle or rear part of stator.

EFFECT: increase of electric generator power and lifetime while reducing diameter sizes.

6 cl, 1 dwg

 

The invention relates to electric machines. Specifically the invention is intended for electric power downhole apparatus and transmitting device downhole telemetry system. The generator converts the energy of the drilling fluid in the electricity necessary to power the downhole navigation and geophysical instruments in the process of drilling and transmitter of electromagnetic communication channel. For the telemetry system at great depths requires an increase in the power transmitting device to 1 kW and more. To get more power, small size of the generator is very problematic.

Known AC generator to power the telemetry system in the process of drilling a small diameter, comprising a stationary inner stator with header and fixed on the drive shaft of the external rotor, equipped with electromagnets (RF patent No. 2060383, MCP EV 47/022, 47/00, priority from 21.02.92 year). The lubrication system is a cavity between the rotor and the stator is filled with lubricating fluid.

Known Autonomous turbine generator (an electric generator), is also designed to supply electrical power to the telemetry system that includes a turbine driven by the flow of drilling fluid, oil flooded the stator, filled Epoque is idnum compound, and the rotor of the alternator with permanent magnets located on the same shaft with the turbine (Molchanov A.A., Shiraev AH, "Autonomous Downhole system with magnetic, M., Nedra, 1979, pp. 102-103).

This generator consists of a stator, placed inside the unit and a six-pole magnetic ring rotor made from the outside. The rotor is also the case for the blades of a three-stage turbine. Before each stage of rotor blades of the turbine, in turn, has three stage guide vanes collected in an external enclosure that increases the diameter of the device. To prevent the ingress of drilling fluid into the generator and bearing assemblies installed sealing device, the internal cavity of the generator is filled with transformer oil.

Due to the fact that the generator operates in the temperature range from -40 to +130°s, when drilling to depths of 3500 m and more, and the volume of oil changes with changing temperature, put the pressure compensator and thermal expansion of lubricating fluid (oil). The compensator pressure and thermal expansion lubricating fluid made in the input fairing generator. It consists of two thin core plates, one of which is convex and the other concave. To compensate for the ATOR pressure and thermal expansion of lubricant is designed to compensate for changes in the volume of oil in oil-filled cavity of the generator in operating conditions when the temperature rises, as well as the equalization of pressure inside and outside of the generator.

The disadvantages of this generator are:

- low reliability

- small resource

- large dimensions and weight of the device

- the complexity of the design.

These shortcomings are due, primarily, to the fact that the drive uses a multistage turbine with guide devices. The use of turbines with the alignment apparatus as actuator imposes high requirements to the quality of cleaning mud from fractions of drilling cuttings and other foreign objects, ingress of which the gap between the workers and the guide blades of the turbine may cause the system to stop (jamming). The presence of the guide vanes of the turbine increases the diametrical dimension of the generator, which is not desirable when drilling relatively small diameter.

The second design flaw is the complexity and unreliability of the pressure compensator and thermal expansion of lubricant. Due to the elasticity of the walls of the compensator pressure of lubricant is always less than the ambient pressure. This can lead to the ingress of drilling fluid into the lubrication system of the generator and to the wear of bearings, seals and other parts.

Also known as the electric generator by the patent is of the Russian Federation No. 2173925, the main feature of which can be considered the lubrication system. The lubrication system of this generator contains the device on its front end face, the cavity between the outer rotor and stator, filled with lubricating fluid, and the pressure compensator and thermal expansion of lubricant placed on the device side for generator mounting, made in the form of a piston mounted for axial movement and seals installed inside the piston for axial movement together with him. A disadvantage of this device is the difficulty of filling system lubricating fluid and low resource seals.

Known downhole generator power telemetry systems Saint of the Russian Federation for useful model No. 34638.

This generator contains the unit in its front part, the cavity between the outer rotor and stator, filled with lubricating fluid, and the pressure compensator and thermal expansion of lubricant placed on the device side for generator mounting, made in the form of a piston installed inside the rotor for axial movement, and a seal mounted in turn within the piston for axial movement together with him, the piston is made with the possibility of drainage from asiausa fluid in the fully charged position in the gap between the rotor and bracket generator.

The disadvantage of this system of lubrication is that due to the overlapping functions of the expansion joint and seal reduces their resource.

Known generator according to St. the Russian Federation No. 13123, which contains a rotor with turbine, stator, the mount and the capacity to supply lubricating fluid made in the form of glass made in the front of the generator installed inside a spring-loaded piston, and the device. The generator and turbine is far removed from each other in the axial direction and separated magnetic coupling, which increases the size of the generator and reduces the reliability of the grease.

Known generator for RF patent for the invention №2264537, prototype, comprising a housing with a winding, a mount, a rotor with a shaft, magnets and turbine mounted through bearings in the housing, and the capacity to supply lubricating fluid in the form of glass made in the front of the generator installed inside a spring-loaded piston and the filling device, characterized in that at least one front bearing is installed in the sleeve, which is centered in the protruding part of the body, closed on the other side of the axis, are fixed against rotation and having an annular groove for winding and cylindrical the ledge in the inner bore of which has, at the very measures which, one rear bearing and the inside of the shaft is a through axial hole. Between the front bearing and rotor installed shim. Winding installed in the housing and fixed with pins from offset. Spring is partially housed inside the piston. The device is designed as a valve mounted in the channel of the rod, a closed tube. The device is designed as a valve mounted in the channel of the rod, closed by a cork.

Disadvantages: low power and resource generator with limited diametral dimensions.

Creating a powerful generator is limited by its diametrical dimensions, and low resource due to the fact that for the lubrication of numerous supports (bearings) inner cavity of the generator is filled with lubricating fluid, but due to the fact that during operation the inside of the generator enters the drilling fluid containing abrasive particles, bearings, seals and other parts wear out quickly.

Tasks of invention - improving the capacity and resource generator with reduced diametrical dimensions.

These tasks are achieved due to the fact that the downhole generator containing the mount, a rotor with impeller turbines and at least one g is foam permanent magnets, kinematically associated with the turbine, and the corresponding winding, characterized in that the kinematic connection of the turbine with groups of permanent magnets are made through the mechanism converting rotary motion into reciprocating. The mechanism for converting rotary motion into reciprocating can be made in the form of a driven disk mounted on the rotor, a driving disk mounted on the axle, and a spring abutting against the end of the axis. Inside of the mount holes. The attachment may be made in the front or middle or at the rear of the stator.

The invention is illustrated in the drawing.

The downhole power generator designed to power the downhole equipment is installed in the string of drill pipe or casing and contains the attachment 1 to the stator 2. In attachment 1 with holes for the passage of drilling mud.

The downhole electrical generator includes a rotor 3 and a turbine 4, specifically with its impeller and has a tilted flat blade set at an angle of 20...45°. To allow the turbine apparatus to simplify its Assembly is not used.

Inside the stator 2 has a cavity "B", which established a mechanism for converting rotary motion into reciprocating comes the part 5. This mechanism can be made of any design, in the specific example it consists of a master disk 6 that has the balls 7, and the driven disk 8 with shaped protrusions 9 on the upper ends of the springs 10. A driving disk 6 is mounted on the rotor 3, the clutch disc 8 on the axis 11, which is made with the possibility of reciprocating axial movement. This is achieved in particular by a spring 10, rests on the lower end of the axis 11. On the axis 11 has one or more groups of permanent magnets 12, opposite which the inside of the stator 2 is installed winding 13. The cavity "B" is filled with lubricating fluid, which is loaded through the hole, made in the rotor 3 and closed by a screw 14. The rotor 3 is installed in the bearing 15 and is sealed from the environment by a seal 16. In the generator unlike traditional schemes applied only bearing 15. This facilitates providing lubrication and protection against penetration of drilling mud.

The cavity "B" trimmed from the cavity "D", which has a field winding 13, the partition wall 17. In the partition 17 on the axis 11 is installed sealing device 17. The sealing device 17 seals the cavity "B" cavity "In" and works in more mild conditions than the sealing device in the generators of traditional schemes, because doubt is considerable movement axis 11 is performed at low speed with a small range of movement of the axis 11. In addition, the cavity "D" is also filled with lubricant or compensatory fluid and the pressure differential between the cavities "B" and "D" is virtually absent.

From the field windings 13 leaves (leave) electric (s) conductor (s) 18, they pass through the holes "D" and "E"are made in the stator 2, and connected to the connector 20. If you have applied one wire, then the function of the other wire runs to the stator 2. The connection of the field windings 13 can be made parallel, serial, or parallel-series. The connector 20 may receive the voltage from the two groups of field windings 13 to supply electricity to various independent consumers. Connector 20, it is advisable to perform coaxial.

When the downhole power generator drilling fluid passes through the turbine 4, which rotates with the rotor 3 and the slave disk 6 mechanism converting rotary motion into reciprocating 5. When the balls 7 periodically exert pressure on the shaped protrusions 9 and the axle 11 moves downwards, and under the action of the spring 10 returns up. These movements are performed periodically, the group (s) of permanent magnets 12 perform a reciprocating motion within the field windings 13. In the windings of the excitation 13 produces an electrical current, which is the province of the ladies 19 is transmitted to the electrical connector 20 and next to the electricity consumer.

The number of groups of permanent magnets 12 and field windings 13 can be made arbitrarily large. This will allow you to design the power supply and the downhole equipment for drilling and casing a very small diameter.

The application of the invention allowed:

1. Significantly reduce the diametrical dimensions and weight of the downhole power generator due to mechanical separation of the turbine and generator.

2. To increase the capacity and the voltage at the electrical terminals of the generator through the use of a large number of groups of permanent magnets and field windings.

3. To reduce the imbalance of the rotor of the downhole power generator by reducing their diameter is 1.5 to 2.0 times.

4. To increase the reliability of the seal cavity of the downhole power generator by reducing the diameter of the seal and by facilitating conditions for operation of the sealing device in the partition: namely, low speed reciprocating movement of the axis and the absence of a pressure differential between adjacent cavities.

5. To increase the service life of the generator by reducing the number of bearings to one and reliable lubrication and sealing from the mud.

6. To simplify the design of the downhole power generator due to the refusal of the application nozzle apparatus curb the us and to simplify the design of all nodes and their unification.

7. To simplify Assembly and disassembly of the downhole power generator due to its implementation of a modular design and application of coaxial electrical connector.

8. To improve the maintainability of the downhole power generator due to the extremely simple design, the minimum number of parts and simple configuration of all the details.

1. The downhole power generator that contains the mount, a rotor with impeller, turbine, and at least one group of permanent magnets, kinematically associated with the turbine, and the corresponding winding, characterized in that the kinematic connection of the turbine with groups of permanent magnets are made through the mechanism converting rotary motion into reciprocating.

2. The downhole power generator according to claim 1, characterized in that the mechanism for converting rotary motion into reciprocating made in the form of a driven disk mounted on the rotor, a driving disk mounted on the axle, and a spring abutting against the end of the axis.

3. The downhole power generator according to claim 1, characterized in that the inside of the mount holes.

4. The downhole power generator according to claim 1 or 2, characterized in that the mount is made in the front of the stator.

5. The downhole power generator according to claim 1 or 2, otlichuy is the, the mount is made in the middle part of the stator.

6. The downhole power generator according to claim 1 or 2, characterized in that the attachment is made at the rear of the stator.



 

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13 cl, 13 dwg

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1 cl, 6 dwg

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EFFECT: increased power of generator; smaller diametric dimensions and weight.

6 cl, 2 dwg

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