Two-stage opposed magnetic suspension turbine generator

Abstract

The invention 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 invention relates to the technical field of power generation equipment, and in particular to a two-stage opposed magnetic suspension turbine generator. Background Art

[0002] The magnetic levitation generator is a power recovery machine that uses the electromagnetic force provided by electromagnetic bearings to keep the rotor 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 in power generation. When its temperature is too high, it will cause the magnets to demagnetize, so the rotor also needs to be cooled.

[0004] For example, in the prior art, CN107476833A discloses a zero-leakage self-cooling magnetically suspended turbine expansion generator and system and method. In the patent, the expansion medium gas path is built-in, and the stator and rotor of the generator are cooled by using the gas medium, so as to achieve the purpose of cooling the generator. However, directly passing 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 present invention provides a two-stage opposed magnetic levitation turbine generator which can reduce rotor wear and lower temperature. Summary of the invention

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

[0007] The present invention is achieved through the following technical solutions:

[0008] The present invention proposes a two-stage opposed magnetic suspension 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 turbine expansion 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 on both sides of the casing 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 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 hub 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 a second-stage turbine static blade and a second-stage turbine moving blade 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 arranged 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, the stator structure 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 stators.

[0015] Furthermore, the axial stator further comprises a thrust plate, 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 present invention:

[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 using the cooling gas after 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 magnetically suspended turbine generator proposed in the present invention can also replace the first-stage turbine impeller, the second-stage turbine moving impeller and the second-stage turbine static impeller, 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 of the pressure surface and suction surface of the first-stage turbine impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an overall structural diagram of the double-stage opposed magnetic suspension turbine generator of the present invention;

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

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

[0028] Please refer to Figure 1 The present invention proposes 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, and the turbine expansion structure includes a two-stage turbine moving blade 14 and a two-stage turbine static blade 13;

[0031] The first-stage turbine volute 1 and the second-stage turbine volute 12 are respectively fixed on 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 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 hub 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, and 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 blades 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 is connected to the rotor 17 and the second-stage turbine moving blades 14 to form a complete impeller structure, and the first-stage turbine nozzle 2 is used to convert the static pressure of the incoming gas into dynamic pressure, and the rotor 17 is hollow and can pass the airflow; the 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, and the gas is accelerated to reduce pressure 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, and the first-stage turbine impeller 3 converts the dynamic pressure of the incoming gas into rotational kinetic energy, so that the pressure and temperature of the incoming gas are reduced, and at the same time drives the rotor 17 to rotate to output electrical energy through the generator. , and 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 will not be overheated 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, and push the second-stage turbine moving blades 14 to expand and heat up, and finally the airflow converges in the second-stage turbine volute 12. The present invention cools the rotor 17 through the hollow flow channel of the rotor 17 through the cooling gas after turbine expansion and cooling, which can reduce the flow resistance of the working fluid gas. The working fluid gas enters the second-stage turbine assembly through the hollow rotating shaft, and its inlet gas is more uniform, which can have a higher expansion ratio and 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 the leakage of the pressure surface and the suction surface 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 , and 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 implementation, 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 supporting structure, which supports the axial bearing.

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

[0040] In a specific implementation, 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 , and two auxiliary bearings 6 are fixed on the rotor 17 and close to the outer side of the axial stator 8 .

[0042] In a specific embodiment, the auxiliary bearing 6 is disposed at the outermost side of the rotor 17 , and 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 flow guide cover 5 and the secondary flow guide cover 16 are used to provide sealing for the primary impeller flow channel and the secondary impeller flow channel respectively to prevent gas leakage when entering the primary impeller flow channel and the secondary impeller flow channel.

[0046] Furthermore, it also includes a cooling water jacket 11 , which 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 cooling water of the casing. The cooling water passes through the casing and cools the casing. The generator is cooled by a combination of 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 then 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, and the second-stage turbine assembly also first installs the second-stage guide cover 16, and the second-stage guide cover 16 is connected to the casing body 18 by bolts, the second-stage turbine impeller 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 integrally formed by processing, 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 turbine expansion structure includes the two-stage turbine moving blades and the two-stage turbine static blades; The first-stage turbine volute and the second-stage turbine volute are respectively fixed on both sides of the casing 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 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 hub 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 a second-stage turbine static blade and a second-stage turbine moving blade 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 arranged 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 is 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 is characterized in that: The stator structure also 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 is characterized in that: The axial stator further comprises a thrust plate, which is arranged inside the axial stator and fixedly connected to the rotor.

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