A high-speed drainage high-pressure kerosene generator

Abstract

A high-speed drainage high-pressure kerosene generator of the present invention utilizes the energy of high-pressure kerosene drained from a rocket engine to perform work, drives a permanent magnet synchronous generator through an axial flow impeller to generate electricity, and meets the power supply requirements of on-board electrical units. The conversion process does not consume working media, and the low-pressure kerosene after work flows back to the rocket engine for combustion utilization. The present invention extracts energy in-situ from the rocket engine for power generation, meets the power supply requirements of on-board electrical units, has characteristics such as sufficient energy source, high conversion efficiency, and high power-to-mass ratio, and is an optimal form of on-board power supply.

Description

Technical Field

[0001] The present invention relates to a high-speed drainage high-pressure kerosene generator, specifically to a high-speed drainage high-pressure kerosene generator for thrust vector control of a liquid oxygen kerosene engine of a launch vehicle. Background Art

[0002] Liquid oxygen kerosene rocket engines have been widely used in mainstream launch vehicles at home and abroad due to their advantages such as large thrust, pollution-free, economic reliability, etc. For example, the RD-107, RD-108, RD-0110, and NK-33 liquid oxygen kerosene engines developed by the Soviet Union have been widely used in the Vostok, Soyuz launch vehicles, and the N-1 manned lunar rocket; the F-1, AJ-1-E6, and Merlin and other liquid oxygen kerosene engines developed by the United States have been widely used in heavy launch vehicles such as the SLS and Falcon 9 launch vehicles.

[0003] For the thrust vector servo control of a liquid oxygen kerosene rocket engine, the high-pressure kerosene of the drainage rocket engine can be used for driving. For the thrust vector control system of a liquid oxygen kerosene rocket engine, the currently widely used power supply scheme is the on-board battery scheme. Restricted by the energy density and power density of the battery, it is very difficult to break through the bottleneck of battery technology and further reduce its volume and weight while meeting the power consumption requirements of the servo system. Summary of the Invention

[0004] The technical problem solved by the present invention is: overcoming the deficiencies of the prior art, providing a high-speed drainage high-pressure kerosene generator, which generates electricity by the work of the high-pressure kerosene drained from the engine, and provides the power electricity required for the action of the servo system. The drainage kerosene generator has higher integration and working fluid ratio, high reliability, and convenient energy extraction, without the need to carry its own energy.

[0005] The technical solution of the present invention is: a high-speed drainage high-pressure kerosene generator, including a prime mover and a permanent magnet synchronous generator, wherein the prime mover includes an axial flow impeller and a contraction section and a nozzle circumferentially distributed at the inlet of the axial flow impeller; after the high-pressure kerosene drained from the rocket engine passes through the circumferentially distributed contraction section and nozzle, the pressure energy is converted into kinetic energy, acting on the blades of the axial flow impeller, driving the axial flow impeller to drive the permanent magnet synchronous generator coaxial with it to rotate at a high speed and output electric energy, realizing the drive of the electrical load; the kerosene after doing work flows back to the rocket engine through the low-pressure oil return pipeline for reuse.

[0006] A first end cover and a second end cover are arranged outside the axial flow impeller; an oil inlet, a contraction section, a nozzle, and an oil outlet are arranged on the first end cover; the high-pressure kerosene enters from the oil inlet, accelerates in the contraction section, is ejected at a high speed after passing through the nozzle, and acts on the axial flow impeller to drive it to rotate at a high speed; the low-pressure kerosene after doing work flows out axially from the hydraulic turbine and flows back to the rocket engine through the oil outlet.

[0007] The axial-flow impeller is coaxially connected to the generator rotor inside the permanent magnet synchronous generator. One or several combinations of connection methods such as threaded connection, riveting, and welding are used for the connection between the two.

[0008] The contraction section and the nozzle are arranged symmetrically in groups along the circumferential direction or circumferentially uniformly distributed in groups.

[0009] A first bearing is arranged between the generator rotor and the axial-flow impeller, and a second bearing is arranged at the other end of the generator rotor.

[0010] A dynamic ring, a static ring, and a spring for axial compensation are arranged between the second end cover and the housing outside the permanent magnet synchronous generator, and a mechanical seal is formed between the closed cavity formed by the first end cover and the second end cover and the permanent magnet synchronous generator.

[0011] A third end cover is arranged at the tail end of the housing for supporting the second bearing.

[0012] A dynamic ring, a static ring, and a spring for axial compensation are arranged between the third end cover and the housing, and a mechanical seal is formed between the closed cavity formed by the third end cover and the housing and the permanent magnet synchronous generator.

[0013] The two mechanical seals respectively form two closed oil cavities at both ends of the generator rotor. The first cavity contains the axial-flow impeller and the first bearing, and the second cavity contains the second bearing. The two bearings are cooled and lubricated by low-pressure kerosene.

[0014] An oil outlet joint is arranged at the oil outlet. The oil outlet joint is provided with a first oil outlet and a second oil outlet. A first joint is arranged on the housing, and a second joint is arranged on the third end cover. A first conduit is arranged between the second oil outlet and the first joint, and a second conduit is arranged between the second joint and the first oil outlet. The low-pressure kerosene after doing work is divided into two paths after passing through the oil outlet joint. One path of kerosene A flows out through the first oil outlet, and the other path of kerosene B enters the second closed cavity through the second oil outlet, the first conduit, and the first joint, provides cooling and lubrication for the second bearing, then flows out through the second joint and the second conduit, converges with oil path A, and then flows back to the rocket engine.

[0015] A magneto-electric speed sensor is arranged on the third end cover, and a speed acquisition groove is arranged at the tail end of the generator rotor to realize real-time measurement of the speed of the drainage generator.

[0016] An electrical connector is arranged on the housing for outputting the electric energy generated by the drainage kerosene generator.

[0017] The advantages of the present invention compared with the prior art are as follows:

[0018] (1) Although traditional arrow-borne batteries can meet the power demand of on-arrow electrical units, they are relatively large in volume and weight, which restricts the improvement of the rocket's carrying capacity to a certain extent. The present invention uses the high-pressure kerosene of the drainage rocket engine as the working medium to drive the generator to generate electricity and supply power to the servo system, which can achieve a smaller volume and weight and is conducive to enhancing the rocket's carrying capacity.

[0019] (2) The present invention does not directly consume the drained high-pressure kerosene, but utilizes the pressure energy of the high-pressure kerosene. The ultimate source of energy is the waste heat generated by combustion in the rocket engine, with sufficient power source. There is no mechanical coupling with the rocket engine and it has almost no impact on the working state of the rocket engine.

[0020] (3) The non-contact axial-flow impeller type prime mover and integrated design of the present invention enable the rotational speed to reach above 50,000 r / min. By reasonably configuring the high-speed nozzle and blade profile parameters, the working pressure can reach 35 MPa.

[0021] (4) The present invention isolates the kerosene medium from the inner cavity of the motor through mechanical seals, which can adapt to higher working speeds (above 50,000 r / min) and avoid stirring oil losses, further improving the power generation efficiency and specific power. When the stirring oil loss is acceptable, the mechanical seal can also be selected to be cancelled to obtain a smaller volume and weight.

[0022] (5) The present invention integrates a large-flow constant-speed valve to achieve constant rotational speed control of the drainage kerosene generator. When the load changes, the output voltage of the generator is relatively stable and the power generation quality is high.

[0023] (6) The contraction section and nozzles arranged at the inlet of the axial-flow impeller of the present invention are symmetrically distributed along the circumference, and the radial force is very small due to mutual cancellation, which is more conducive to achieving high rotational speeds.

[0024] (7) The present invention uses a non-contact impeller as the prime mover, which does not have friction pairs that are sensitive to foreign objects and does not require a filter, achieving a smaller volume and weight.

[0025] (8) A high-speed type drainage high-pressure kerosene generator involved in the present invention has a working medium of drainage high-pressure kerosene and is mainly for kerosene medium. After passing the medium compatibility verification, it can also be extended and applied to other liquid fuel occasions such as unsymmetrical dimethylhydrazine. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a high-speed type drainage high-pressure kerosene generator according to the present invention.

[0027] Figure 2 It is a structural diagram of a high-speed type drainage high-pressure kerosene generator according to the present invention.

[0028] Figure 3This is the external view of a high-speed drainage high-pressure kerosene generator of the present invention. Detailed implementation manners

[0029] The present invention relates to a high-speed drainage high-pressure kerosene generator, which is highly integrated by a high-speed axial-flow impeller and a permanent magnet synchronous generator. Among them, functional components such as a large-flow constant-speed valve and a high-speed nozzle are integrated at the inlet of the high-speed axial-flow impeller.

[0030] As Figure 1 shown, under the regulation of the constant-speed valve, the drained high-pressure kerosene passes through the high-speed nozzle at a pressure matching the load, and the pressure energy is converted into kinetic energy, acting on the axial-flow kerosene impeller to drive the impeller to drive the high-speed generator coaxial with it to rotate at a high speed, outputting electrical energy to drive the electrical load. After the kerosene passes through the axial-flow impeller, it flows back to the engine through the low-pressure return oil pipeline for reuse.

[0031] As Figure 2 shown, a number of high-speed nozzles 2 are arranged on the end cover 1. After the oil passes through the constant-speed valve, it is ejected through the high-speed nozzle 2. Part of the pressure energy of the oil is converted into kinetic energy and is ejected onto the blades of the axial-flow impeller 3 at a high speed, driving the impeller 3 to rotate at a high speed and driving the generator rotor 4 connected coaxially to rotate synchronously for power generation.

[0032] As Figure 2 shown, the number of high-speed nozzles 2 on the end cover 1 can be arranged in groups along the circumferential direction. In particular, they can be arranged symmetrically in groups or evenly distributed in a circle in groups.

[0033] As Figure 2 shown, according to actual needs, mechanical seal devices can be arranged at both ends of the generator rotor 4 to isolate the generator rotor from the kerosene medium, avoiding losses caused by the high-speed rotation of the generator rotor stirring the oil; the mechanical seal generally includes dynamic rings 5, 8 that rotate synchronously with the shaft, static rings 6, 9 fixed to the installation housing, and springs 7, 10 that play an axial compensation role.

[0034] As Figure 2 shown, the two mechanical seals form two closed oil cavities 13 and 14 at the left and right ends of the drained kerosene generator respectively. Among them, the closed cavity 13 contains the impeller 3 and the left bearing 11, and the closed cavity 14 contains the right bearing 12. The two bearings are cooled and lubricated by low-pressure kerosene.

[0035] As Figure 2 shown, according to the actual situation, the mechanical seals at both ends of the generator rotor 4 can also be cancelled, enabling the whole machine to achieve a higher degree of integration, further reducing the volume and weight.

[0036] As Figure 2As shown, a magnetoelectric speed sensor 15 and a speed acquisition groove 16 are arranged at the tail end of the generator rotor 4 to achieve real-time measurement of the speed of the drainage generator.

[0037] As Figure 2 and Figure 3 shown, the drainage high-pressure kerosene flows into the generator from the oil inlet 17. A pipe joint 18 is arranged on the right side of the impeller 3 in the closed cavity 13. Two oil outlets 19 and 20 are arranged on the pipe joint 18. Most of the low-pressure kerosene A after doing work flows back to the engine through the oil outlet 19, and a small part B is led to the oil outlet 21 through a conduit from the oil outlet 20, enters the cavity 14, cools and lubricates the right bearing 12, and then is led to converge with A through the oil outlet 22 by a conduit and returns to the engine together.

[0038] As Figure 3 shown, the electric energy generated by the drainage kerosene generator is output through the electrical connector 23.

[0039] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solution of the present invention without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention all fall within the protection scope of the technical solution of the present invention.

Claims

1. A high-speed drainage high-pressure kerosene generator, characterized in that: It includes a prime mover and a permanent magnet synchronous generator. The prime mover includes an axial flow impeller (3), a contraction section (27) and nozzles (2) that are circumferentially distributed evenly at the inlet of the axial flow impeller (3). After the high-pressure kerosene diverted from the rocket engine passes through the circumferentially distributed contraction section (27) and nozzles (2), the pressure energy is converted into kinetic energy, which acts on the blades of the axial flow impeller (3), driving the axial flow impeller (3) to drive the permanent magnet synchronous generator coaxial with it to rotate at high speed and output electric energy, realizing the drive of the electrical load. The kerosene after doing work flows back to the rocket engine through the low-pressure return oil pipeline for reuse. A first end cover (24) and a second end cover (25) are arranged outside the axial flow impeller (3). A moving ring, a stationary ring and a spring for axial compensation are arranged between the second end cover (25) and the housing (1) outside the permanent magnet synchronous generator, forming a mechanical seal between the first closed cavity (13) formed by the first end cover (24) and the second end cover (25) and the permanent magnet synchronous generator. An oil outlet joint (18) is arranged on the oil outlet (28). A first oil outlet (19) and a second oil outlet (20) are arranged on the oil outlet joint (18). A first joint (21) is arranged on the housing (1). A second joint (22) is arranged on the third end cover (29). A first conduit (30) is arranged between the second oil outlet (20) and the first joint (21). A second conduit (31) is arranged between the second joint (22) and the first oil outlet (19). The low-pressure kerosene after doing work is divided into two paths after passing through the oil outlet joint (18). One path of kerosene A flows out through the first oil outlet (19). The other path of kerosene B enters the second closed cavity (14) through the second oil outlet (20), the first conduit (30) and the first joint (21), provides cooling and lubrication for the second bearing (12), and then flows out through the second joint (22) and the second conduit (31), converges with the oil path A, and then flows back to the rocket engine. A moving ring, a stationary ring and a spring for axial compensation are arranged between the third end cover (29) and the housing (1), forming a mechanical seal between the second closed cavity (14) formed by the third end cover (29) and the housing (1) and the permanent magnet synchronous generator.

2. The high-speed drainage high-pressure kerosene generator according to claim 1, characterized in that: An oil inlet (17), a contraction section (27), nozzles (2) and an oil outlet (28) are arranged on the first end cover (24). The high-pressure kerosene enters from the oil inlet (17), accelerates in the contraction section (27), sprays out at high speed after passing through the nozzles (2), and acts on the axial flow impeller (3) to drive it to rotate at high speed. The low-pressure kerosene after doing work flows out axially from the hydraulic turbine and flows back to the rocket engine through the oil outlet (28).

3. A high-speed drainage high-pressure kerosene generator according to claim 1, characterized in that: The axial flow impeller (3) is coaxially connected to the generator rotor (4) inside the permanent magnet synchronous generator.

4. A high-speed drainage high-pressure kerosene generator according to claim 1, characterized in that: The axial flow impeller (3) and the generator rotor (4) inside the permanent magnet synchronous generator adopt a connection method that is a combination of one or several of threaded connection, riveting, and welding.

5. A high-speed drainage high-pressure kerosene generator according to claim 2, characterized in that: The contraction section (27) and the nozzles (2) are arranged symmetrically in groups or circumferentially distributed evenly in groups along the circumferential direction.

6. A high-speed drainage high-pressure kerosene generator according to claim 2, characterized in that: A first bearing (11) is arranged between the generator rotor (4) and the axial flow impeller (3), and a second bearing (12) is arranged at the other end of the generator rotor (4).

7. A high-speed drainage high-pressure kerosene generator according to claim 1, characterized in that: A third end cover (29) is arranged at the tail end of the housing (1) for supporting the second bearing (12).

8. A high-speed drainage high-pressure kerosene generator according to claim 7, characterized in that: A magnetoelectric speed sensor (15) is arranged on the third end cover (29), and a speed acquisition groove (16) is arranged at the tail end of the generator rotor (4) to realize real-time measurement of the speed of the drainage generator.

9. A high-speed drainage high-pressure kerosene generator according to claim 7, characterized in that: An electrical connector (23) is arranged on the housing (1) for outputting the electric energy generated by the drainage kerosene generator.

10. A high-speed drainage high-pressure kerosene generator according to claim 8, characterized in that: The first closed cavity (13) contains the axial flow impeller (3) and the first bearing (11), and the second closed cavity (14) contains the second bearing (12). The two bearings are cooled and lubricated by low-pressure kerosene.

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