Two-stage opposed magnetic suspension turbine generator

Abstract

The utility model provides a two-stage opposed magnetic suspension turbine generator, and particularly relates to the technical field of power generation equipment, the two-stage opposed magnetic suspension turbine generator is characterized in that a rotor is cooled by cooling gas expanded and cooled by a turbine through a hollow flow channel of the rotor, so that the flow resistance of working medium gas can be reduced; working medium gas enters the second-stage turbine assembly through the hollow rotating shaft, inlet gas is more uniform, a higher expansion ratio can be achieved, and meanwhile wind abrasion of the rotor can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power generation equipment, in particular to a two-stage opposed magnetic suspension turbine generator. Background Art

[0002] A magnetic levitation generator is a power recovery machine that uses the electromagnetic force provided by electromagnetic bearings to maintain the rotor's motion trajectory within a certain limit. Compared with traditional mechanical shafts, magnetic levitation bearings have a long service life, low friction, and low noise. Due to their dynamic adjustment of bearing stiffness and damping, they support a wide speed range and can provide a reliable operating environment for turbine rotating machinery.

[0003] However, since the electromagnetic bearings continuously have current input to maintain stability and the generator generates a lot of heat, the temperature rise of the rotor will also increase with the increase of power generation. When its temperature is too high, it will cause the magnets to demagnetize, so the rotor also needs to be cooled.

[0004] In the prior art, for example, CN107476833A discloses a zero-leakage self-cooling magnetic levitation turbine expansion generator, system, and method. The patent achieves the purpose of cooling the generator by placing the expansion medium gas path internally and using the gaseous medium to cool the stator and rotor of the generator. However, directly flowing the medium through the rotor and stator will cause excessive flow resistance of the medium, and the high-speed moving airflow will increase the wind friction loss of the rotor.

[0005] In view of this, the utility model provides a two-stage opposed magnetic levitation turbine generator which can reduce rotor wear and lower temperature. Utility Model Content

[0006] In order to solve the problem of rotor wear caused by directly using working fluid to cool the rotor, the utility model proposes a two-stage opposed magnetic levitation turbine generator.

[0007] The utility model is achieved through the following technical solutions:

[0008] The utility model proposes a two-stage opposed magnetic levitation turbine generator comprising a first-stage turbine assembly, a second-stage turbine assembly, a rotor and a casing body, wherein:

[0009] The first-stage turbine assembly includes a first-stage turbine volute, a first-stage turbine nozzle, a first-stage turbine impeller, and a first-stage turbine impeller cover;

[0010] The two-stage turbine assembly includes a two-stage turbine volute, an expansion turbine structure and a two-stage turbine impeller cover, and the expansion turbine structure includes the two-stage turbine moving blades and the two-stage turbine static blades;

[0011] The first-stage turbine volute and the second-stage turbine volute are respectively fixed to both sides of the casing main body, the first-stage turbine volute is provided with a first-stage volute inlet, the first-stage volute inlet is also provided with a first-stage turbine nozzle, the first-stage turbine volute is provided with a first-stage turbine impeller cover on the side away from the casing main body, the first-stage turbine impeller cover is fixedly connected to the first-stage turbine volute, a first-stage impeller flow channel is provided between the first-stage turbine impeller cover and the first-stage turbine volute, a first-stage turbine impeller is provided in the first-stage impeller flow channel, a second-stage turbine outlet is provided on the second-stage turbine volute, a second-stage impeller flow channel is provided in the second-stage turbine volute, and second-stage turbine static blades and second-stage turbine moving blades are provided in the second-stage impeller flow channel;

[0012] One side of the rotor is connected to the first-stage turbine impeller, and the other side is connected to the second-stage turbine moving blades through the second-stage turbine impeller cover. A hollow flow channel is provided in the rotor, and both sides of the hollow flow channel are connected to the first-stage impeller flow channel and the second-stage impeller flow channel.

[0013] Furthermore, it also includes a stator structure, which includes a motor stator winding. The motor stator winding is arranged in the casing body, and the motor stator winding is fixed on the rotor and close to the center.

[0014] Furthermore, the stator structure also includes an axial stator and a radial stator, two of the radial stators are fixed on the rotor and close to the outside of the motor stator winding, and two of the axial stators are fixed on the rotor and close to the outside of the radial stator.

[0015] Furthermore, the axial stator further includes a thrust disk, which is arranged inside the axial stator and fixedly connected to the rotor.

[0016] Furthermore, it also includes auxiliary bearings, two of which are fixed on the rotor and close to the outer side of the axial stator.

[0017] Furthermore, it also includes a first-stage air guide cover, which is fixedly connected to one side of the casing body and fits the first-stage turbine volute.

[0018] Furthermore, it also includes a secondary air guide cover, which is fixedly connected to the other side of the casing body and fits the secondary turbine volute.

[0019] Furthermore, it also includes a cooling water jacket, which is fixed to the outside of the casing body.

[0020] Beneficial effects of the utility model:

[0021] (1) The two-stage opposed magnetic levitation turbine generator proposed in the present invention cools the rotor through the hollow flow channel of the rotor by the cooling gas after the turbine expansion and cooling, which can reduce the flow resistance of the working gas. The working gas enters the two-stage turbine assembly through the hollow shaft, and its inlet gas is more uniform, which can have a higher expansion ratio and reduce the wind wear of the rotor.

[0022] (2) The two-stage opposed magnetic levitation turbine generator proposed in the present invention can also replace the first-stage turbine impeller, the second-stage turbine moving blades and the second-stage turbine static blades, so that the entire turbine generator becomes a compressor or a fan. At the same time, only the structure of the first-stage turbine assembly can be retained. Under certain conditions, the magnetic bearings can be replaced with mechanical bearings to further reduce the axial size of the entire generator.

[0023] (3) The two-stage opposed magnetic levitation turbine generator proposed in the present invention can adjust the gap between the turbine impeller hub and the first-stage turbine impeller by changing the thickness of the gasket, thereby reducing the leakage on the pressure side and the suction side of the first-stage turbine impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is the overall structural diagram of the double-stage opposed magnetic levitation turbine generator of the present utility model;

[0025] In the figure: first-stage turbine volute 1, first-stage turbine nozzle 2, first-stage turbine impeller 3, first-stage turbine impeller cover 4, first-stage shroud 5, auxiliary bearing 6, thrust plate 7, axial stator 8, radial stator 9, motor stator winding 10, cooling water jacket 11, second-stage turbine volute 12, second-stage turbine static blades 13, second-stage turbine moving blades 14, second-stage turbine impeller cover 15, second-stage shroud 16, rotor 17, casing body 18;

[0026] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0027] In order to more clearly and completely illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings.

[0028] Please refer to Figure 1 The present invention provides a two-stage opposed magnetic levitation turbine generator with a self-cooling rotor 17, comprising a first-stage turbine assembly, a second-stage turbine assembly, a rotor 17 and a casing body 18, wherein:

[0029] The first stage turbine assembly includes a first stage turbine volute 1, a first stage turbine nozzle 2, a first stage turbine impeller 3 and a first stage turbine impeller cover 4;

[0030] The two-stage turbine assembly includes a two-stage turbine volute 12, an expansion turbine structure and a two-stage turbine impeller cover 15. The expansion turbine structure includes two-stage turbine moving blades 14 and two-stage turbine static blades 13.

[0031] The first-stage turbine volute 1 and the second-stage turbine volute 12 are respectively fixed to both sides of the casing body 18. The first-stage turbine volute 1 is provided with a first-stage volute inlet, and a first-stage turbine nozzle 2 is also provided at the first-stage volute inlet. A first-stage turbine impeller cover 4 is provided on the side of the first-stage turbine volute 1 away from the casing body 18. The first-stage turbine impeller cover 4 is fixedly connected to the first-stage turbine volute 1. A first-stage impeller flow channel is provided between the first-stage turbine impeller cover 4 and the first-stage turbine volute 1. A first-stage turbine impeller 3 is provided in the first-stage impeller flow channel. A second-stage turbine outlet is provided on the second-stage turbine volute 12. A second-stage impeller flow channel is provided in the second-stage turbine volute 12. A second-stage turbine static blade 13 and a second-stage turbine moving blade 14 are provided in the second-stage impeller flow channel.

[0032] One side of the rotor 17 is connected to the first-stage turbine impeller 3, and the other side is connected to the second-stage turbine moving blade 14 through the second-stage turbine impeller cover 15. A hollow flow channel is provided in the rotor 17, and both sides of the hollow flow channel are connected to the first-stage impeller flow channel and the second-stage impeller flow channel.

[0033] In a specific embodiment, the first-stage turbine impeller cover 4 and the first-stage turbine volute 1 together form a first-stage impeller flow channel, in which a first-stage turbine impeller 3 is arranged, and the second-stage turbine impeller cover 15 connects the rotor 17 and the second-stage turbine moving blades 14 to form a complete impeller structure. The first-stage turbine nozzle 2 is used to convert the static pressure of the incoming gas into dynamic pressure. The rotor 17 is hollow and can pass the airflow; high-pressure gas enters from the first-stage volute inlet on the first-stage turbine volute 1, and then evenly sprays toward the first-stage turbine nozzle 2. The gas is accelerated and depressurized in the first-stage turbine nozzle 2 and enters the first-stage impeller flow channel, and then pushes the first-stage turbine impeller 3 to rotate. The first-stage turbine impeller 3 converts the dynamic pressure of the incoming gas into rotational kinetic energy, thereby reducing the pressure and temperature of the incoming gas, and at the same time drives the rotor 17 to rotate to output electrical energy through the generator. The low-temperature airflow flowing out of the first-stage turbine impeller 3 enters the hollow flow channel of the rotor 17 to cool the rotor 17, ensuring that the rotor 17 does not overheat and cause the magnets on the rotor 17 to be demagnetized. At the same time, the high-speed gas is expanded and compressed, and finally the gas enters the second-stage impeller flow channel from the hollow flow channel in the rotor 17. The second-stage turbine static blades 13 in the flow channel accelerate the gas flow channel, push the second-stage turbine moving blades 14 and expand and heat up, and finally complete the airflow convergence in the second-stage turbine volute 12. The utility model cools the rotor 17 through the hollow flow channel of the rotor 17 by the cooling gas after turbine expansion and cooling, which can reduce the flow resistance of the working gas. The working gas enters the second-stage turbine assembly through the hollow rotating shaft, and its inlet gas is more uniform, can have a higher expansion ratio, and can reduce the wind wear of the rotor 17.

[0034] In one embodiment, a gasket is provided between the first-stage turbine impeller cover 4 and the first-stage turbine volute 1, and the first-stage turbine impeller cover 4 is fixed to the volute by bolts. The first-stage turbine impeller cover 4 can adjust the gap between the first-stage turbine impeller cover 4 and the first-stage turbine impeller 3 by changing the thickness of the gasket, thereby reducing leakage on the pressure side and suction side of the first-stage turbine impeller 3.

[0035] Furthermore, it also includes a stator structure, which includes a motor stator winding 10. The motor stator winding 10 is arranged in the casing body 18, and the motor stator winding 10 is fixed on the rotor 17 and close to the center.

[0036] In a specific embodiment, the motor stator winding 10 is fixed at the center of the rotor 17, and the motor stator is used to generate electricity.

[0037] Furthermore, the stator structure also includes an axial stator 8 and a radial stator 9 . The two radial stators 9 are fixed on the rotor 17 and close to the outside of the motor stator winding 10 . The two axial stators 8 are fixed on the rotor 17 and close to the outside of the radial stators 9 .

[0038] In a specific embodiment, the axial stator 8 and the radial stator 9 are used to provide axial electromagnetic force and radial electromagnetic force respectively to ensure that the rotor 17 is suspended in the axial and radial directions. The axial bearing also includes a support structure, which supports the axial bearing.

[0039] Furthermore, the axial stator 8 further includes a thrust disk 7 , which is disposed inside the axial stator 8 and fixedly connected to the rotor 17 .

[0040] In a specific embodiment, the thrust disk 7 and the axial stator 8 form an axial magnetic bearing. The outer side of the thrust disk 7 is fixed to the inner wall of the axial stator 8 , and the inner side is fixedly connected to the rotor 17 .

[0041] Furthermore, it also includes auxiliary bearings 6 , two auxiliary bearings 6 are fixed on the rotor 17 and close to the outside of the axial stator 8 .

[0042] In a specific embodiment, the auxiliary bearing 6 is disposed at the outermost side of the rotor 17 . The auxiliary bearing 6 is used to provide protection for the entire rotor 17 when it is not suspended, thereby preventing the rotor 17 from being damaged.

[0043] Furthermore, it also includes a first-stage air guide cover 5, which is fixedly connected to one side of the casing body 18 and fits the first-stage turbine volute 1;

[0044] It also includes a secondary air guide cover 16 , which is fixedly connected to the other side of the casing body 18 and fits the secondary turbine volute 12 .

[0045] In a specific embodiment, the primary guide cover 5 and the secondary guide cover 16 are used to provide sealing for the primary impeller flow channel and the secondary impeller flow channel, respectively, to prevent gas from leaking when entering the primary impeller flow channel and the secondary impeller flow channel.

[0046] Furthermore, a cooling water jacket 11 is included, and the cooling water jacket 11 is fixed to the outside of the casing body 18 .

[0047] In a specific embodiment, the cooling water jacket 11 is used to provide a flow channel for the cooling water of the casing. The cooling water passes through the casing and cools the casing. The generator is cooled by water cooling and air cooling to achieve multiple cooling and ensure the stability of the rotor 17 and the bearings.

[0048] In summary, during the specific installation, the motor stator winding 10, radial bearings, axial bearings, auxiliary bearings 6 and rotors 17 are installed first, and then the two sides are installed, wherein the first-stage turbine assembly is installed first, and the first-stage guide cover 5 is connected to the casing body 18 by bolts, and the first-stage turbine nozzle 2 is welded to the first-stage guide cover 5, and then the first-stage turbine volute 1 is installed and fixed to the casing body 18 by bolts, the first-stage turbine impeller 3 is connected to the rotor 17 by threads, and the first-stage turbine impeller cover 4 is connected to the casing body 18 by threads. The second-stage turbine assembly also first installs the second-stage guide cover 16, and connects the second-stage guide cover 16 to the casing body 18 by bolts, the second-stage turbine moving blades 14 and the second-stage turbine impeller cover 15 are connected to the hollow rotor 17 by threads, and the second-stage turbine static blades 13 are connected to the second-stage turbine volute 12 by welding or casting, and the second-stage turbine volute 12 and the casing body 18 are connected by bolts.

[0049] In one embodiment, the second-stage turbine blades 14 and the second-stage turbine impeller cover 15 can be processed into an integral piece, the number of the second-stage turbine blades 14 and the second-stage turbine static blades 13 can be adjusted according to the expansion ratio, the first-stage turbine impeller 3, the second-stage turbine blades 14 and the second-stage turbine static blades 13 can be replaced, so that the entire turbine generator becomes a compressor or a fan, and at the same time, only the structure of the first-stage turbine assembly can be retained. Under certain conditions, the magnetic bearings can be replaced with mechanical bearings to further reduce the axial size of the entire generator.

[0050] Of course, the present invention may have many other implementations. Based on this implementation, other implementations obtained by ordinary technicians in this field without any creative work are all within the scope of protection of the present invention.

Claims

1. A two-stage opposed magnetic levitation turbine generator, characterized in that: It includes a first-stage turbine assembly, a second-stage turbine assembly, a rotor and a casing body, wherein: The first-stage turbine assembly includes a first-stage turbine volute, a first-stage turbine nozzle, a first-stage turbine impeller, and a first-stage turbine impeller cover; The two-stage turbine assembly includes a two-stage turbine volute, an expansion turbine structure and a two-stage turbine impeller cover, and the expansion turbine structure includes two-stage turbine moving blades and two-stage turbine static blades; The first-stage turbine volute and the second-stage turbine volute are respectively fixed to both sides of the casing main body, the first-stage turbine volute is provided with a first-stage volute inlet, the first-stage volute inlet is also provided with a first-stage turbine nozzle, the first-stage turbine volute is provided with a first-stage turbine impeller cover on the side away from the casing main body, the first-stage turbine impeller cover is fixedly connected to the first-stage turbine volute, a first-stage impeller flow channel is provided between the first-stage turbine impeller cover and the first-stage turbine volute, a first-stage turbine impeller is provided in the first-stage impeller flow channel, a second-stage turbine outlet is provided on the second-stage turbine volute, a second-stage impeller flow channel is provided in the second-stage turbine volute, and second-stage turbine static blades and second-stage turbine moving blades are provided in the second-stage impeller flow channel; One side of the rotor is connected to the first-stage turbine impeller, and the other side is connected to the second-stage turbine moving blades through the second-stage turbine impeller cover. A hollow flow channel is provided in the rotor, and both sides of the hollow flow channel are connected to the first-stage impeller flow channel and the second-stage impeller flow channel.

2. The two-stage opposed magnetic levitation turbine generator according to claim 1, characterized in that: It also includes a stator structure, which includes a motor stator winding. The motor stator winding is arranged in the casing body and is fixed on the rotor and close to the center.

3. The two-stage opposed magnetic levitation turbine generator according to claim 2, characterized in that: The stator structure further includes an axial stator and a radial stator. Two radial stators are fixed on the rotor and close to the outside of the motor stator winding, and two axial stators are fixed on the rotor and close to the outside of the radial stator.

4. The two-stage opposed magnetic levitation turbine generator according to claim 3, characterized in that: The axial stator further includes a thrust disk, which is arranged inside the axial stator and fixedly connected to the rotor.

5. The two-stage opposed magnetic levitation turbine generator according to claim 4, characterized in that: It also includes auxiliary bearings, wherein two auxiliary bearings are fixed on the rotor and close to the axial outer side of the stator.

6. The two-stage opposed magnetic levitation turbine generator according to claim 1, characterized in that: It also includes a first-stage flow guide cover, which is fixedly connected to one side of the casing body and fits the first-stage turbine volute.

7. The two-stage opposed magnetic levitation turbine generator according to claim 1, characterized in that: It also includes a secondary air guide cover, which is fixedly connected to the other side of the casing body and fits the secondary turbine volute.

8. The two-stage opposed magnetic levitation turbine generator according to claim 1, characterized in that: It also includes a cooling water jacket, which is fixed to the outside of the casing body.

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