A motor integrated tesla turbine power generation device

Abstract

The application discloses a motor integrated Tesla turbine power generation device which adopts a structure of integrated turbine shell, Tesla turbine and impeller generator, high-pressure fluid working medium is reduced in pressure and accelerated by a turbine nozzle, and internal energy is converted into kinetic energy to drive a disc type impeller to rotate. The disc type impeller is coupled with a motor rotor, rotates under the drive of the fluid working medium, and simultaneously drives the impeller and the motor rotor to rotate relative to a motor stator to generate electricity. The high-speed fluid working medium sprayed by the turbine nozzle can enter the gap between the motor stator and the motor rotor while driving the disc type impeller to work, thereby achieving the cooling of the impeller generator. The application has the technical effects of compact structure, narrow applicable space, recycling of working medium, fast response speed, expansion of the range of applicable working medium and the like. More internal energy can be converted into kinetic energy by the turbine nozzle, and the loss is reduced; the start, operation and braking control are realized by using a frequency converter, the consumption of the working medium is reduced, and the turbine runaway is prevented; and various working media are widely used to realize clean and environment-friendly power generation.

Description

Technical Field

[0001] This invention belongs to the field of high-efficiency power generation technology that combines turbomachinery and power generation. It relates to a power generation device, specifically a motor-integrated Tesla turbine power generation device, which can be widely used in compressed air energy storage, renewable energy utilization, waste heat utilization, and supercritical carbon dioxide cycle. Background Technology

[0002] The Tesla turbine is a bladeless turbine that utilizes the boundary layer effect, relying on the viscous stress acting on the surface of a rotating disk to drive the rotor's rotation. The rotor of a Tesla turbine consists of a series of coaxial, parallel, rigid disks mounted on a central shaft, with minute gaps between the disks. The working fluid is accelerated in a nozzle or volute and then injected almost tangentially into the rotor disks. The fluid forms a boundary layer along the disk surface and flows along a helical path in the disk gaps, finally exiting the rotor through holes or slots near the shaft. The friction between the disks and the fluid causes the disks to rotate, outputting torque and power. The Tesla turbine is characterized by its simple structure, low manufacturing cost, smooth operation, and high efficiency.

[0003] The Tesla turbine serves as a highly efficient, low-noise, and low-vibration turbine for generating rotational power. Integrating the Tesla turbine with a generator to create a power generation system enables more efficient and environmentally friendly power generation. Its advantages include the ability to utilize various low-cost, low-pollution fluid media, such as water, air, and steam, to achieve clean and renewable power generation. Furthermore, the bladeless structure of the Tesla turbine reduces noise, vibration, and maintenance costs. In addition, the integrated application of the Tesla turbine and generator can be used in other power generation scenarios, such as hydropower and thermal power generation. By integrating the Tesla turbine, power generation efficiency can be improved, noise and vibration reduced, and environmental impact minimized.

[0004] Taking the "Ultra-high-speed Tesla turbine kerosene generator" disclosed in Chinese invention patent application CN201911056687.X as an example, the high-speed generator rotor shaft and the Tesla turbine pump rotor assembly shaft are connected by a threaded connection. The ultra-high-speed Tesla turbine pump kerosene generator draws high-pressure, high-speed kerosene from a rocket engine, which acts on the Tesla turbine pump rotor blades, converting the fluid shear force acting on the blades into rotational mechanical energy for external output, driving the generator to generate electricity. This technology directly uses high-pressure, high-speed kerosene from a rocket engine as the working medium, converting the fluid shear force acting on the rotor blades into rotational mechanical energy for external output, driving the high-speed generator to rotate synchronously and generate electricity. No additional pressurization device is required. After use, the kerosene is filtered through a high-flow-rate filter and returned to the rocket kerosene engine for secondary use, realizing the development and recycling of existing high-pressure liquid energy without consuming energy itself. However, this patent has some shortcomings. First, because the motor and Tesla turbine are connected by a shaft, the integration is low and the volume is large. This may limit its use in some space-constrained applications. Secondly, the motor cooling structure is quite complex and cannot solve the problems of complex and high-loss existing turbine structures. This may cause the motor to generate excessive heat when running at high speeds, affecting its performance and lifespan. Summary of the Invention

[0005] (I) Purpose of the Invention

[0006] To address the aforementioned shortcomings and deficiencies of existing technologies, and to resolve the technical problems of large size, low integration, complex motor cooling structure, complex turbine structure, and high losses in existing Tesla turbine power generation systems, this invention proposes a motor-integrated Tesla turbine power generation device. By adopting a highly integrated structure of impeller generator and Tesla turbine, the working fluid inside the Tesla turbine can provide cooling for the impeller generator, further reducing structural complexity. Furthermore, the working fluid can recover some of the motor's heat. Through this highly integrated structure, the Tesla turbine body has a low moment of inertia, enabling rapid start-up or shutdown based on load requirements.

[0007] (II) Technical Solution

[0008] To achieve the objective of this invention and solve its technical problems, the present invention adopts the following technical solution:

[0009] An integrated Tesla turbine generator, comprising at least a turbine housing, a Tesla turbine, and an impeller generator, is characterized in that...

[0010] The turbine housing is a thin-walled cylindrical structure. A turbine nozzle is provided at its radial outer edge, which communicates with its hollow inner cavity and extends along its tangent. The inlet of the turbine nozzle is connected to an external high-pressure fluid working medium source through a pipeline. The inner wall shape of the turbine nozzle cavity is designed such that when the high-pressure fluid working medium passes through the cavity, its internal energy is converted into kinetic energy, and the pressure decreases while the speed increases.

[0011] The Tesla turbine is integrally housed within the turbine housing and includes at least an impeller drive shaft and a disc impeller.

[0012] The two ends of the impeller drive shaft are sealed by support members and rotatably disposed at the center of the front and rear end walls of the turbine housing.

[0013] The disc impeller includes multiple rigid disc blades arranged in parallel and fixedly mounted on the impeller drive shaft at equal intervals. Each rigid disc blade extends radially to a position close to the inner cylindrical wall of the turbine housing. Several working fluid passage holes are provided circumferentially near the radial inner edge of each rigid disc blade. The working fluid passage holes on adjacent rigid disc blades correspond one-to-one in the circumferential position. The axial end walls of the turbine housing are provided with working fluid outlets corresponding to the working fluid passage holes in the radial and circumferential positions. The axial gap between two adjacent rigid disc blades is set to allow the working fluid to form a boundary layer along the surface of the disc blade and flow along a spiral path in the axial gap, thereby causing the disc impeller to rotate under the drive of the working fluid through the boundary layer viscosity.

[0014] The impeller generator includes at least a motor rotor and a motor stator, both of which are disc-shaped. The motor rotor includes an annular permanent magnet or multiple sector permanent magnets, which are fixedly connected to the outer end face of the outermost rigid disc blade in the disc impeller. When assembled, the motor rotor rotates with the disc impeller within the turbine housing without any motion interference with the inner wall of the turbine housing or adjacent components. The motor stator includes an iron core and coils, which are fixedly disposed on or near the axial end wall of the turbine housing. When assembled, the motor stator and motor rotor are spatially adjacent and have an axial gap, which forms an air gap magnetic field.

[0015] In the electric motor integrated Tesla turbine generator of the present invention, the turbine nozzle is used to depressurize and accelerate the high-pressure fluid working medium and convert its internal energy into kinetic energy and spray it onto the disc impeller. The disc impeller is fixed together with the motor rotor to form an integral structure. The disc impeller rotates under the influence of the fluid working medium through boundary layer viscosity, which drives the motor rotor to rotate relative to the motor stator to generate electricity. The high-speed fluid working medium sprayed by the turbine nozzle can also enter the gap between the motor stator and the motor rotor while driving the disc impeller to do work, thereby cooling the impeller generator.

[0016] Preferably, a fluid pump for driving the flow of the working fluid is provided on the connecting pipeline between the turbine nozzle and the external high-pressure fluid working fluid source.

[0017] Preferably, the inner wall shape of the turbine nozzle cavity is tapered or tapered.

[0018] Preferably, the surface roughness of each rigid disc blade in the disc impeller is set and manufactured according to the viscosity of the working fluid.

[0019] Preferably, the working fluid passage holes on each rigid disc blade in the disc impeller are fan-shaped, circular, or rectangular.

[0020] Preferably, the support members at both ends of the impeller drive shaft are rolling bearings or electromagnetic bearings.

[0021] Preferably, the annular permanent magnet or multiple sector-shaped permanent magnets of the motor rotor are fixedly disposed in the disc impeller on the outer end face of the outermost rigid disc blade in the axial direction by interference fit or adhesive bonding.

[0022] Preferably, the iron core and coil of the motor stator are fixedly disposed on the inner or outer surface of the axial end wall of the turbine housing.

[0023] Preferably, the iron core and coil of the motor stator are fixedly mounted on a fixed bracket located inside the turbine housing.

[0024] Preferably, there are two motor rotors and two motor stators. One motor stator is provided on each of the two axial end walls of the turbine housing, and one motor rotor is provided on each of the two outermost rigid disc blades in the disc impeller.

[0025] Preferably, the impeller generator is connected to the power grid via a frequency converter to receive electromagnetic induction energy generated by the impeller generator.

[0026] Furthermore, the frequency converter is in a four-quadrant configuration:

[0027] When the Tesla turbine starts, the power grid drives the disc impeller to the design speed through the frequency converter, and then the fluid working medium is introduced to do work, so as to reduce the consumption of fluid working medium.

[0028] When the Tesla turbine is operating normally, the frequency converter is used to convert the electrical energy generated by the impeller generator into power frequency electrical energy to meet the grid requirements;

[0029] When the Tesla turbine experiences a load shedding failure, the inverter drives the disc impeller to brake, preventing the turbine from running away.

[0030] The working principle of the electric motor integrated Tesla turbine inverter generator of the present invention is as follows: A high-pressure fluid first enters the turbine nozzle, and after depressurization and acceleration, it enters the turbine housing, driving the internal disc impeller to rotate. The motor rotor, fixed on the disc impeller, rotates accordingly, creating relative motion with the motor stator fixed on the turbine housing, generating electromagnetic induction electrical energy. This energy is converted into power frequency current by the inverter and transmitted to the power grid. After the fluid performs work on the disc impeller, it is discharged from the turbine housing through the exhaust port. While the high-speed fluid after passing through the turbine nozzle drives the impeller, it also enters the gap between the motor stator and rotor, achieving motor cooling.

[0031] (III) Technical Effects

[0032] Compared with the prior art, the electric motor integrated Tesla turbine generator of the present invention has the following beneficial and significant technical effects:

[0033] (1) The motor-integrated Tesla turbine generator of the present invention adopts a highly integrated structure of disc motor and Tesla turbine, which is compact and suitable for confined spaces.

[0034] (2) The electric motor integrated Tesla turbine generator of the present invention adopts a highly integrated structure of disc motor and Tesla turbine. The high-speed fluid working medium can not only drive the disc impeller to rotate, but also enter the gap between the rotor and stator to provide cooling for the disc motor, further reducing the complexity of the structure. In addition, the working medium can also recover some of the motor heat, improving system efficiency and service life.

[0035] (3) The motor-integrated Tesla turbine generator of the present invention adopts a highly integrated structure of disc motor and Tesla turbine. The Tesla turbine body has a low rotational inertia and can start or stop quickly according to load requirements.

[0036] (4) The motor-integrated Tesla turbine generator of the present invention has a turbine nozzle that can depressurize and accelerate the high-pressure fluid working medium, and its internal energy is converted into more kinetic energy to drive the impeller to rotate. The disc impeller rotates under the drive of the fluid working medium through the boundary layer viscosity, which reduces the losses caused by bearings, etc.

[0037] (5) The motor-integrated Tesla turbine generator of the present invention uses a frequency converter to realize the starting, running and braking control of the motor, which helps to reduce the consumption of fluid working fluid, and can drive the impeller to brake during load shedding to prevent turbine runaway, thereby improving the motor's response speed and safety.

[0038] (6) The electric motor integrated Tesla turbine power generation device of the present invention can make extensive use of various renewable energy sources as fluid working fluid to achieve clean and environmentally friendly power generation. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the motor-integrated Tesla turbine inverter generator of the present invention;

[0040] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure;

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Turbine nozzle, 2. Impeller generator, 3. Motor rotor, 4. Motor stator, 5. Disc impeller, 6. Impeller drive shaft, 7. Working fluid flow hole, 8. Bearing, 9. Turbine housing, 10. Frequency converter, 11. Power grid. Detailed Implementation

[0043] To better understand the present invention, the following embodiments further illustrate its content. Throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The described embodiments are some, but not all, of the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The structure and technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings, providing one embodiment of the present invention.

[0044] like Figure 1 , 2 As shown, the motor-integrated Tesla turbine frequency converter provided in this embodiment includes at least a turbine housing 9, a Tesla turbine, and an impeller generator 2. The turbine housing 9 is generally in the form of a thin-walled cylindrical structure. A turbine nozzle 1 is provided at its radial outer edge, which communicates with its hollow inner cavity and extends along its tangent. The inlet of the turbine nozzle 1 is connected to an external high-pressure fluid working medium source through a pipeline. The inner wall shape of the turbine nozzle 1 cavity is designed such that when the high-pressure fluid working medium passes through the cavity, its internal energy is converted into kinetic energy, and the pressure decreases while the speed increases.

[0045] The Tesla turbine is housed within a turbine housing 9 and includes at least an impeller drive shaft 6 and a disc impeller 5. The impeller drive shaft 6 is sealed at both ends by supports and rotatably mounted at the center of the front and rear end walls of the turbine housing 9. The disc impeller 5 comprises multiple parallel, evenly spaced rigid disc blades fixed to the impeller drive shaft 6. Each rigid disc blade extends radially to a position close to the cylindrical inner wall of the turbine housing 9, and each rigid disc blade has several working fluid passage holes 7 circumferentially located near its radial inner edge. The working fluid passage holes 7 on adjacent rigid disc blades correspond one-to-one circumferentially. The axial end walls of the turbine housing 9 have working fluid outlets corresponding to the working fluid passage holes 7 in both radial and circumferential positions. The axial clearance between adjacent rigid disc blades is configured to allow the working fluid to form a boundary layer along the surface of the disc blades and flow along a helical path within this axial clearance. This causes the disc impeller 5 to rotate under the influence of the working fluid due to the boundary layer viscosity.

[0046] The impeller generator 2 includes at least a motor rotor 3 and a motor stator 4, both of which are disc-shaped. The motor rotor 3 includes an annular permanent magnet or multiple sector permanent magnets. The annular permanent magnet or multiple sector permanent magnets are fixedly connected and disposed on the outer end face of the outermost rigid disc blade in the disc impeller 5 in the axial direction. When in the assembled state, the motor rotor 3 rotates with the disc impeller 5 within the turbine housing 9 without any motion interference with the inner wall of the turbine housing 9 or any adjacent components. The motor stator 4 includes an iron core and a coil. The iron core and the coil are fixedly disposed on or near the axial end wall of the turbine housing 9. When in the assembled state, the motor stator 4 and the motor rotor 3 are arranged close to each other in space and have an axial gap. The axial gap between the two forms an air gap magnetic field.

[0047] In the electric motor integrated Tesla turbine generator of the present invention, the turbine nozzle 1 is used to depressurize and accelerate the high-pressure fluid working medium and convert its internal energy into kinetic energy and spray it onto the disc impeller 5. The disc impeller 5 is fixed together with the motor rotor 3 to form an integral structure. The disc impeller 5 rotates under the drive of the fluid working medium through boundary layer viscosity, which drives the motor rotor 3 to rotate relative to the motor stator 4 to generate electricity. The high-speed fluid working medium sprayed by the turbine nozzle 1 can also enter the gap between the motor stator 4 and the motor rotor 3 while driving the disc impeller 5 to do work, thereby cooling the impeller generator 2.

[0048] In a preferred embodiment of the present invention, a fluid pump for driving the flow of the working fluid is provided on the connecting pipeline between the turbine nozzle 1 and the external high-pressure fluid working fluid source. The shape and structure of the inner wall of the turbine nozzle 1 cavity are preferably tapered or tapered. The surface roughness of each rigid disc blade in the disc impeller 5 is set and manufactured according to the viscosity of the working fluid. The working fluid passage hole 7 on each rigid disc blade in the disc impeller 5 is fan-shaped, circular, or rectangular. The support members at both ends of the impeller drive shaft 6 are rolling bearings or electromagnetic bearings. In addition, the annular permanent magnet or multiple fan-shaped permanent magnets of the motor rotor 3 are preferably fixed on the outer end face of the outermost rigid disc blade in the disc impeller 5 in the axial direction by interference fit or adhesive bonding. The iron core and coil of the motor stator 4 are fixed on the inner or outer surface of the axial end wall of the turbine housing 9, or fixed on a fixed bracket located inside the turbine housing 9.

[0049] In a preferred embodiment of the present invention, there are two motor rotors 3 and two motor stators 4. A motor stator 4 is provided on each of the two end walls of the turbine housing 9 along the axial direction. A motor rotor 3 is provided on each of the two outermost rigid disc blades in the disc impeller 5 along the axial direction.

[0050] In a preferred embodiment of the present invention, the impeller generator 2 is connected to the power grid 11 via a frequency converter 10 to receive the electromagnetic induction power generated by the impeller generator 2. The frequency converter 10 is in a four-quadrant configuration: when the turbine starts, the power grid 11 drives the disc impeller 5 to the design speed through the frequency converter 10, and then introduces a fluid working medium to do work, thereby reducing the consumption of the fluid working medium; when the turbine is running normally, the frequency converter 10 is used to convert the power energy generated by the impeller generator 2 into power frequency power to meet the requirements of the power grid 11; when the turbine experiences a load shedding failure, the frequency converter 11 drives the disc impeller 5 to brake, in order to prevent the turbine from running away.

[0051] The electric motor integrated Tesla turbine generator disclosed in this embodiment operates as follows: The fluid working medium first enters the turbine nozzle 1, undergoes decompression and acceleration, and then enters the turbine housing 9, driving the internal disc impeller 5 to rotate. The motor rotor 3, fixed on the disc impeller 5, rotates accordingly, creating relative motion with the motor stator 4 fixed on the turbine housing 9, generating electromagnetic induction energy. This energy is converted into power frequency current by the frequency converter 10 and transmitted to the power grid 11. After performing work on the disc impeller 5, the fluid working medium is discharged from the turbine housing 9 through the exhaust port 7. While the high-speed fluid working medium after passing through the turbine nozzle 1 drives the impeller to perform work, it can also enter the gap between the motor stator and rotor, achieving motor cooling.

[0052] The objectives of this invention have been fully and effectively achieved through the above embodiments. Those skilled in the art will understand that this invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments described above. Although the invention has been described with reference to what is currently considered the most practical and preferred embodiments, it should be understood that the invention is not limited to the disclosed embodiments, and any modifications that do not depart from the functional and structural principles of the invention will be included within the scope of the claims.

Claims

1. A motor integrated Tesla turbine power generation device, comprising at least a turbine housing, a Tesla turbine, an impeller generator and a frequency converter, characterized in that, the turbine housing is a thin-walled cylindrical structure as a whole, and a turbine nozzle is arranged on the outer edge of the turbine housing and communicates with the hollow cavity of the turbine housing and extends along the tangent line of the turbine housing, the inlet of the turbine nozzle is communicated with the external high-pressure fluid source through pipeline, and the inner wall shape of the turbine nozzle is configured to convert the internal energy of the high-pressure fluid into kinetic energy when the high-pressure fluid passes through the turbine nozzle, so that the pressure drop speed is increased; the Tesla turbine is arranged in the turbine housing as a whole, and comprises at least an impeller driving shaft and a disc impeller, wherein, the two ends of the impeller driving shaft are sealingly and rotatably arranged at the center of the front and rear end walls of the turbine housing through supporting members, the disc impeller comprises a plurality of rigid disc blades arranged in parallel and fixed on the impeller driving shaft in an equidistantly spaced manner, each rigid disc blade extends to a position close to the cylindrical inner wall of the turbine housing in the radial direction, and a plurality of working fluid flow holes are arranged near the radial inner edge of each rigid disc blade in the circumferential direction, the working fluid flow holes on adjacent rigid disc blades correspond to each other in the circumferential position, the axial end walls of the turbine housing are provided with working fluid discharge ports corresponding to the working fluid flow holes in the radial and circumferential positions, and the axial gap between adjacent rigid disc blades is arranged to make the fluid flow along the spiral path in the boundary layer formed on the surface of the disc blade, so that the disc impeller is rotated by the boundary layer viscosity under the drive of the fluid. the impeller generator comprises a motor rotor and a motor stator which are both disc-shaped structures, wherein the motor rotor comprises a ring-shaped permanent magnet or a plurality of fan-shaped permanent magnets which are fixedly arranged on the outer end surface of the outermost rigid disc blade in the disc impeller in the axial direction, and in the assembled state, the motor rotor rotates with the disc impeller in the turbine housing without movement interference with the inner wall of the turbine housing and adjacent components; the motor stator comprises a core and a coil which are fixedly arranged on or near the axial end wall of the turbine housing, and in the assembled state, the motor stator is arranged in close proximity to the motor rotor with an axial gap, and the axial gap between them forms an air gap magnetic field; and the impeller generator is connected to the power grid through the frequency converter, and the frequency converter is in four-quadrant form: when the Tesla turbine starts, the power grid drives the disc impeller to reach the design speed through the frequency converter, and then the fluid is introduced to do work to reduce the consumption of fluid; when the Tesla turbine is running normally, the frequency converter is used to convert the electric energy generated by the impeller generator into power frequency electric energy to meet the requirements of the power grid; when the Tesla turbine is tripped under load, the frequency converter drives the disc impeller to brake to prevent the turbine from flying.

2. The motor integrated Tesla turbine power generation device according to claim 1, characterized by The connecting pipeline between the turbine nozzle and the external high-pressure fluid working medium source is provided with a fluid pump for driving the working medium to flow, and the inner wall shape of the turbine nozzle is configured in a tapered or zooming manner.

3. The motor integrated Tesla turbine power generation device according to claim 1, characterized by The surface roughness of each rigid disc blade in the disc impeller is set and manufactured according to the viscosity of the fluid working medium, and the working medium flow holes on each rigid disc blade in the disc impeller are in the shape of a sector, a circle or a rectangle.

4. The motor integrated Tesla turbine power generation device according to claim 1, characterized by The support at both ends of the impeller driving rotating shaft is a rolling bearing or an electromagnetic bearing.

5. The motor integrated Tesla turbine power generation device according to claim 1, characterized by The annular permanent magnet or the plurality of sector-shaped permanent magnets of the motor rotor are fixedly arranged on the outer end face of the outermost rigid disc blade in the disc impeller in an interference fit or a gluing manner.

6. The motor integrated Tesla turbine power generation device according to claim 1, wherein The core and coil of the motor stator are fixedly arranged on the inner surface or the outer surface of the axial end wall of the turbine housing.

7. The motor integrated Tesla turbine power generation device according to claim 1, characterized by The core and coil of the motor stator are fixedly arranged on a fixed support in the turbine housing.

8. The motor integrated Tesla turbine power generation device of claim 1, wherein, The number of the motor rotor and the motor stator is two, one motor stator is arranged on each of the axial end walls of the turbine housing, and one motor rotor is arranged on each of the two outermost rigid disc blades in the disc impeller in the axial direction.

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