CN214366394U - Micro gas turbine with axial force balancing structure - Google Patents
Micro gas turbine with axial force balancing structure Download PDFInfo
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- CN214366394U CN214366394U CN202023021949.XU CN202023021949U CN214366394U CN 214366394 U CN214366394 U CN 214366394U CN 202023021949 U CN202023021949 U CN 202023021949U CN 214366394 U CN214366394 U CN 214366394U
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Abstract
The utility model discloses a micro gas turbine with a structure for balancing axial force, which comprises a rotating shaft, a gas compressor, a turbine and a combustion chamber, wherein the gas compressor and the turbine are arranged on the rotating shaft, the gas compressor is communicated with the combustion chamber through a high-pressure gas cavity, and an exhaust port of the combustion chamber is opposite to the turbine; the thrust bearing and the radial bearing supply air through an air inlet pipe; the high-pressure air cavity is communicated with the bearing gap through a supplementary air inlet pipe, and the bearing gap is kept between the nut and the bearing stator by air thrust and magnetic force. The utility model discloses a set up bearing clearance and magnetic bearing in thrust bearing to make this thrust bearing form gas, magnetism hybrid thrust bearing, gas bearing and magnetic bearing collaborative work can improve thrust bearing's dynamic behavior and stability, and anti disturbance ability is strong, and then has improved thrust bearing's bearing capacity.
Description
Technical Field
The utility model relates to a miniature gas turbine with balanced axial force structure belongs to miniature gas turbine technical field.
Background
The micro gas turbine mainly comprises three parts, namely a gas compressor, a combustion chamber and a turbine, wherein air is compressed into high-temperature and high-pressure air after entering the gas compressor, then the high-temperature and high-pressure air is supplied to the combustion chamber to be mixed and combusted with fuel, and the generated high-temperature and high-pressure gas expands in the turbine to do work. During operation of the gas turbine, the airflow exerts an axial force on the rotor blades and the disk, thereby generating an axial force. To prevent the rotor from moving in the axial direction, the thrust bearing receives an axial force from the gas turbine rotor. From the gas dynamics, it can be known that: axial forces on the compressor rotor of a gas turbine are forward, while axial forces on the turbine rotor are backward. Under the maximum working condition, a turbine rotor on a gas turbine generator needs to bear backward axial force, while a compressor rotor needs to bear larger forward axial force, and even if two opposite axial forces on the rotor after the compressor rotor and the turbine rotor are connected into a whole are mutually offset, the two opposite axial forces still have a large forward axial force. Therefore, a relief device must be provided to reduce the axial load of the rotor on the thrust bearing.
Disclosure of Invention
To the above-mentioned prior art, the utility model provides a miniature gas turbine with balanced axial force structure.
The utility model discloses a realize through following technical scheme:
a micro gas turbine with a structure for balancing axial force comprises a rotating shaft, a gas compressor, a turbine and a combustion chamber, wherein the gas compressor and the turbine are arranged on the rotating shaft, the gas compressor is communicated with the combustion chamber through a high-pressure gas cavity, and an exhaust port of the combustion chamber is opposite to the turbine; a thrust disc is arranged on the rotating shaft, a thrust bearing is sleeved on the thrust disc, and a radial bearing is also arranged on the rotating shaft;
the thrust bearing comprises a first bearing body and a second bearing body which are symmetrically arranged, and the first bearing body and the second bearing body are axially and symmetrically installed with the thrust disc and have a preset first axial gap; the outer end wall of the first bearing body is provided with a first air groove, the outer end wall of the second bearing body is provided with a second air groove, the bottoms of the first air groove and the second air groove are both provided with through air holes, and the air holes are communicated with the corresponding air grooves and the corresponding first axial gaps; a third radial clearance is preset between the rotating shaft and the inner rings of the first bearing body and the second bearing body; a fourth radial gap is formed between the side wall of the thrust disc accommodating groove surrounded by the first bearing body and the second bearing body and the side wall of the thrust disc;
a preset second radial gap is formed between the inner wall of the radial bearing and the rotating shaft; the outer wall of the radial bearing is provided with a third air groove, the bottom of the third air groove is provided with a through air hole, and the air hole is communicated with the third air groove and the second radial gap;
the first air tank, the second air tank and the third air tank are respectively communicated with one air inlet pipe, and air is supplied to each air tank through the air inlet pipes;
the compressor is fixed at the air inlet end of the rotating shaft through a nut at the end part of the compressor; the end face of the nut is a plane, the outer end of the end face of the nut is provided with a bearing stator, and a bearing gap exists between the bearing stator and the end face of the nut; the high-pressure air cavity is communicated with the bearing gap through a supplementary air inlet pipe.
Further, an air groove is formed in the end face of the nut and/or one face, close to the nut, of the bearing stator; when the nut is rotated, the flowing gas present in the bearing gap is pressed into the air groove, thereby generating a pressure to achieve non-contact holding of the nut in the axial direction.
Furthermore, a bearing gap is kept between the nut and the bearing stator by means of magnetic force (a magnetic part is additionally arranged). Specifically, the nut terminal surface is provided with first magnetic part, and the bearing stator leans on one side of nut to be provided with along circumference can with first magnetic part between produce a plurality of second magnetic part of magnetic force, the nut can drive the pivot and remove in the axial direction under the magnetic force effect between first magnetic part and a plurality of second magnetic part.
Still further, the first magnetic component comprises a plurality of magnetic materials which are uniformly distributed on the end face of the nut in a radial shape along the circumferential direction; the second magnetic part comprises a plurality of permanent magnets which are uniformly distributed on the end surface of the bearing stator in a radial shape along the circumferential direction; or: the second magnetic part comprises a plurality of electromagnets, the plurality of electromagnets are uniformly distributed in a spoke shape along the circumferential direction on the end face of the bearing stator, and each electromagnet of the plurality of electromagnets comprises a magnetic core arranged on the end face of the bearing stator and a coil wound on the magnetic core.
Further, the bearing stator can be supported in a shell covered on the front side of the compressor in a connecting rod mode and the like.
Furthermore, a pressure valve is arranged on the supplementary air inlet pipe and used for controlling the pressure of supplementary air.
Further, the thrust bearing and the radial bearing are both air bearings.
Further, the number and position of the bearings may be changed according to the technical idea of the present invention, and various corresponding changes and modifications may be made, and a preferable mode is: the thrust disc and the thrust bearing are arranged in the middle of the rotating shaft; the number of the radial bearings is two, and the radial bearings are arranged at two ends of the rotating shaft.
Further, the thrust bearing further comprises a first bearing housing and a second bearing housing; the first bearing shell comprises an end part and a circumferential part, the end part is arranged at the outer end of the first bearing body, and the circumferential part is sealed and covered on the periphery of a radial bearing; the second bearing shell comprises a first cylindrical part and a second cylindrical part which are arranged in a stepped mode, the first cylindrical part covers the peripheries of the first bearing body and the second bearing body, and the second cylindrical part is sealed and covered on the periphery of the other radial bearing; the first circumferential part of the second bearing housing is axially fixed with the end part of the first bearing housing; the first bearing housing and/or the second bearing housing are stationary components.
Further, the first bearing shell or/and the second bearing shell is/are provided with a pressure relief hole.
The utility model discloses a micro gas turbine with balanced axial force structure, during operation, gas first gets into the compressor, and the combustion in the combustion chamber is gone into after compressor pressure boost, high-pressure air cavity of flowing through to hot combustion product namely high-temperature gas from the combustion chamber export blowout, promote the turbine rotation, and drive the compressor rotation rather than through pivot coaxial coupling, so, the compressor operation need not other device drive, can effectively reduce equipment running cost; the high-temperature gas after pushing the turbine to rotate can be used for waste heat recovery or power generation. When the turbine of the generator is used for generating electricity, the turbine of the generator can be arranged at the tail end of the combustion chamber, the rim of the turbine is positioned at the tail end of the exhaust port of the combustion chamber, and the high-temperature gas sequentially pushes the turbine to rotate and the turbine of the generator to rotate so as to drive the rotating shaft of the generator to rotate and generate electricity.
The principle of balancing the axial force is as follows: when the micro gas turbine is started, the supplementary air inlet pipe is closed, the rest air inlet pipes are opened, air is supplied to each air groove and enters the first axial gap and the second radial gap along the air inlet holes to form air films; after the gas turbine rotor normally runs, the acting force in the front direction and the back direction borne by the rotor counteracts the remaining forward acting force, all the rest air inlet pipes are closed at the moment, all the bearings maintain static pressure, the supplementary air inlet pipe is opened, partial air in a high-pressure air cavity enters a bearing gap S5, an air thrust bearing is formed from the front side (when the magnetic force is increased between the nut 3 and the bearing stator 4 to keep the bearing gap S5, an air-magnetic mixed thrust bearing is formed), and then the acting force is reduced or counteracted (the pressure of the supplementary air can be controlled through a pressure valve).
The utility model discloses a miniature gas turbine with balanced axial force structure is with the gaseous atress face of sending to compressor inlet end in the high-pressure gas chamber, makes the gaseous terminal surface to the compressor inlet end of lasting exerting pressure of the intracavity of high-pressure gas to reach the purpose of balanced axial force. Furthermore, the utility model discloses a set up bearing clearance and magnetic bearing in thrust bearing to make this thrust bearing form gas, magnetism hybrid thrust bearing. Therefore, the gas bearing and the magnetic bearing can work cooperatively, so that the dynamic performance and the stability of the thrust bearing (particularly in a high-speed running state) can be improved, the disturbance resistance is high, and the bearing capacity of the thrust bearing is further improved. The utility model discloses a miniature gas turbine with balanced axial force structure can effectively reduce the axial force, increases unit stability, reduces the consumption, and the lifting efficiency, and do not have vulnerable part, can prolong the unit life-span.
The various terms and phrases used herein have the ordinary meaning as is well known to those skilled in the art. To the extent that the terms and phrases are not inconsistent with a known meaning, the meaning of the present invention is expressed, the specification is set forth.
Drawings
FIG. 1: the structure of the micro gas turbine is schematically shown (the flow direction of the gas is shown by the arrow in the figure).
FIG. 2: the end face of the nut is provided with an air groove.
Wherein, 20-a compressor; 21-a turbine; 231-a combustion chamber; 234-high pressure air cavity; 24-a rotating shaft; 241-a thrust bearing; 2411-a first bearing body; 2412-a second bearing body; 242-radial bearing; 243-air inlet pipe; 2431-make-up intake; 281-a first bearing housing; 282-a second bearing housing; s1 — first radial gap; s2 — second axial gap; s3 — third axial gap; s4-fourth axial gap; 3-a nut; 301-air slot; 4-a bearing stator; s5 — bearing clearance; 2401-a first air slot; 2402-a second air slot; 2403-a third air slot; 244-thrust plate receiving slot.
Detailed Description
The present invention will be further described with reference to the following examples. However, the scope of the present invention is not limited to the following examples. Those skilled in the art will appreciate that various changes and modifications may be made to the invention without departing from the spirit and scope of the invention.
EXAMPLE 1 micro gas turbine with axial force balance Structure
The high-pressure gas turbine comprises a rotating shaft 24, a compressor 20, a turbine 21 and a combustion chamber 231, as shown in fig. 1, wherein the compressor 20 and the turbine 21 are installed on the rotating shaft 24, the compressor 20 is communicated with the combustion chamber 231 through a high-pressure gas cavity 234, and an exhaust port of the combustion chamber 231 is opposite to the turbine 21; a thrust disc is arranged in the middle of the rotating shaft 24, a thrust bearing 241 is sleeved on the thrust disc, and two radial bearings 242 are respectively arranged at two ends of the rotating shaft 24; the thrust bearing 241 and the radial bearing 242 are both air bearings.
The thrust bearing 241 comprises a first bearing body 2411 and a second bearing body 2412 which are symmetrically arranged, wherein the first bearing body 2411 and the second bearing body 2412 are symmetrically arranged with the thrust disc in the axial direction and have a preset first axial gap S1; the outer end wall of the first bearing body 2411 is provided with a first air groove 2401, the outer end wall of the second bearing body 2412 is provided with a second air groove 2402, and the bottoms of the first air groove 2401 and the second air groove 2402 are both provided with through air holes which are communicated with the corresponding air grooves and the corresponding first axial gaps S1; a third radial gap S3 is preset between the inner rings of the first bearing body 2411 and the second bearing body 2412 and the rotating shaft 24; a fourth radial gap S4 is provided between the side wall of the thrust disc accommodating groove 244 surrounded by the first bearing body 2411 and the second bearing body 2412 and the side wall of the thrust disc.
A predetermined second radial gap S2 is formed between the inner wall of the radial bearing 242 and the rotating shaft 24; the outer wall of the radial bearing 242 is provided with a third air groove 2403, and the bottom of the third air groove 2403 is provided with a through air hole which communicates the third air groove 2403 and the second radial gap S2.
The air conditioner also comprises 4 air inlet pipes 243, wherein (two) of the first air groove 2401, the second air groove 2402 and the third air groove 2403 are respectively communicated with one air inlet pipe 243, and air is supplied to each air groove by the air inlet pipe 243.
The compressor 20 is fixed at the air inlet end of the rotating shaft 21 through a nut at the end part of the compressor; the end face of the nut 3 is a plane, the outer end of the end face of the nut 3 is provided with a bearing stator 4, and a bearing gap S5 exists between the bearing stator 4 and the end face of the nut 3; the high pressure air chamber 234 communicates with the bearing gap S5 through a supplementary intake pipe 2431. The supplementary air inlet pipe can be provided with a pressure valve for controlling the pressure of the supplementary air.
An air groove 301 is arranged on the end face of the nut 3, as shown in FIG. 2; when the nut 3 is rotated, the flowing gas existing in the bearing gap S5 is pressed into the air groove 301, thereby generating pressure to achieve non-contact holding of the nut 3 in the axial direction.
The bearing stator 4 may be supported in a housing covered on the front side of the compressor 20 by means of a connecting rod or the like.
When the micro gas turbine with the structure for balancing the axial force works, gas firstly enters the gas compressor 20, is pressurized by the gas compressor 20, flows through the high-pressure gas cavity 234 and then enters the combustion chamber 231 for combustion, and hot combustion products, namely high-temperature gas, are ejected from the outlet of the combustion chamber 231 to push the turbine 21 to rotate and drive the gas compressor 20 coaxially connected with the turbine to rotate through the rotating shaft 24, so that the gas compressor 20 does not need to be driven by other devices during operation, and the operation cost of equipment can be effectively reduced; the high-temperature gas after the turbine 21 is driven to rotate can be used for waste heat recovery or for power generation. When the high-temperature gas is used for generating electricity, the turbine of the generator can be arranged at the tail end of the combustion chamber, the rim of the turbine is positioned at the tail end of the exhaust port of the combustion chamber, the high-temperature gas sequentially pushes the turbine 21 to rotate and the turbine of the generator to rotate, and then the rotating shaft of the generator is driven to rotate, so that electricity is generated.
The principle of balancing the axial force is as follows: when the micro gas turbine is started, the supplementary air inlet pipe 2431 is closed, the rest air inlet pipes are opened, air is supplied to each air groove and enters the first axial gap S1 and the second radial gap S2 along the air inlet holes to form air films; after the gas turbine rotor normally runs, the front and back acting forces borne by the rotor counteract the remaining forward acting force, at the moment, the rest air inlet pipes are closed, each bearing maintains static pressure, the supplementary air inlet pipe 2431 is opened, partial air in a high-pressure air cavity enters the bearing gap S5, an air thrust bearing is formed from the front side (when the magnetic force is increased between the nut 3 and the bearing stator 4 to keep the bearing gap S5, an air-magnetic mixed thrust bearing is formed), and then the acting force is reduced or counteracted (the pressure of supplementary air can be controlled through the pressure valve).
Example 2 micro gas turbine with axial force balancing structure
The structure is the same as that of the embodiment 1, except that:
the bearing gap S5 is maintained between the nut 3 and the bearing stator 4 by means of magnetic force: the end face of the nut 3 is provided with a first magnetic component, one face of the bearing stator 4 close to the nut 3 is circumferentially provided with a plurality of second magnetic components capable of generating magnetic force with the first magnetic component, and the nut 3 can drive the rotating shaft 24 to move in the axial direction under the action of the magnetic force between the first magnetic component and the second magnetic components.
The first magnetic component comprises a plurality of magnetic materials which are uniformly distributed on the end surface of the nut 3 along the circumferential direction in a radial shape; the second magnetic part comprises a plurality of permanent magnets which are uniformly distributed on the end face of the bearing stator 4 in a radial shape along the circumferential direction.
EXAMPLE 3 micro gas turbine with Structure for Balancing axial forces
The structure is the same as that of the embodiment 1, except that:
the bearing gap S5 is maintained between the nut 3 and the bearing stator 4 by means of magnetic force: the end face of the nut 3 is provided with a first magnetic component, one face of the bearing stator 4 close to the nut 3 is circumferentially provided with a plurality of second magnetic components capable of generating magnetic force with the first magnetic component, and the nut 3 can drive the rotating shaft 24 to move in the axial direction under the action of the magnetic force between the first magnetic component and the second magnetic components.
The first magnetic component comprises a plurality of magnetic materials which are uniformly distributed on the end surface of the nut 3 along the circumferential direction in a radial shape; the second magnetic part comprises a plurality of electromagnets, the plurality of electromagnets are uniformly distributed in a spoke shape along the circumferential direction on the end face of the bearing stator 4, and each electromagnet of the plurality of electromagnets comprises a magnetic core arranged on the end face of the bearing stator 4 and a coil wound on the magnetic core.
EXAMPLE 4 micro gas turbine with axial force Balancing Structure
The structure is the same as that of embodiment 1, 2 or 3, except that:
the thrust bearing 241 further includes a first bearing housing 281 and a second bearing housing 282, as shown in fig. 1; the first bearing housing 281 comprises an end portion and a circumferential portion, wherein the end portion is mounted at the outer end of the first bearing body 2411, and the circumferential portion is hermetically covered on the outer periphery of a radial bearing 242; the second bearing housing 282 includes a first circumferential portion and a second circumferential portion, which are cylindrical and arranged in a stepped manner, the first circumferential portion being provided to cover the outer peripheries of the first bearing body 2411 and the second bearing body 2412, and the second circumferential portion being provided to seal the outer periphery of the other radial bearing 242; a first circumferential portion of the second bearing housing 282 is axially fixed with an end portion of the first bearing housing 281; the first bearing housing 281 and/or the second bearing housing 282 are stationary components. The first bearing housing 281 or/and the second bearing housing 282 may be provided with a pressure relief hole.
The above examples are provided to those of ordinary skill in the art to fully disclose and describe how to make and use the claimed embodiments, and are not intended to limit the scope of the disclosure herein. Modifications apparent to those skilled in the art are intended to be within the scope of the appended claims.
Claims (10)
1. A micro gas turbine having a structure for balancing axial forces, comprising: the high-pressure gas turbine comprises a rotating shaft, a gas compressor, a turbine and a combustion chamber, wherein the gas compressor and the turbine are arranged on the rotating shaft, the gas compressor is communicated with the combustion chamber through a high-pressure gas cavity, and an exhaust port of the combustion chamber is opposite to the turbine; a thrust disc is arranged on the rotating shaft, a thrust bearing is sleeved on the thrust disc, and a radial bearing is also arranged on the rotating shaft;
the thrust bearing comprises a first bearing body and a second bearing body which are symmetrically arranged, and the first bearing body and the second bearing body are axially and symmetrically installed with the thrust disc and have a preset first axial gap; the outer end wall of the first bearing body is provided with a first air groove, the outer end wall of the second bearing body is provided with a second air groove, the bottoms of the first air groove and the second air groove are both provided with through air holes, and the air holes are communicated with the corresponding air grooves and the corresponding first axial gaps; a third radial clearance is preset between the rotating shaft and the inner rings of the first bearing body and the second bearing body; a fourth radial gap is formed between the side wall of the thrust disc accommodating groove surrounded by the first bearing body and the second bearing body and the side wall of the thrust disc;
a preset second radial gap is formed between the inner wall of the radial bearing and the rotating shaft; the outer wall of the radial bearing is provided with a third air groove, the bottom of the third air groove is provided with a through air hole, and the air hole is communicated with the third air groove and the second radial gap;
the first air tank, the second air tank and the third air tank are respectively communicated with one air inlet pipe, and air is supplied to each air tank through the air inlet pipes;
the compressor is fixed at the air inlet end of the rotating shaft through a nut at the end part of the compressor; the end face of the nut is a plane, the outer end of the end face of the nut is provided with a bearing stator, and a bearing gap exists between the bearing stator and the end face of the nut; the high-pressure air cavity is communicated with the bearing gap through a supplementary air inlet pipe.
2. The micro gas turbine with balanced axial force configuration of claim 1, wherein: and an air groove is formed in the end face of the nut and/or one surface of the bearing stator, which is close to the nut.
3. The micro gas turbine with balanced axial force configuration of claim 1, wherein: and a magnetic part is additionally arranged between the nut and the bearing stator, so that a bearing gap is kept between the nut and the bearing stator by virtue of magnetic force.
4. The micro gas turbine with balanced axial force configuration of claim 3, wherein: the end face of the nut is provided with a first magnetic part, one face, close to the nut, of the bearing stator is provided with a plurality of second magnetic parts capable of generating magnetic force with the first magnetic part along the circumferential direction, and the nut can drive the rotating shaft to move in the axial direction under the action of the magnetic force between the first magnetic part and the second magnetic parts.
5. The micro gas turbine with balanced axial force configuration of claim 4, wherein: the first magnetic component comprises a plurality of magnetic materials which are uniformly distributed on the end face of the nut in a radial shape along the circumferential direction; the second magnetic part comprises a plurality of permanent magnets which are uniformly distributed on the end surface of the bearing stator in a radial shape along the circumferential direction; or: the second magnetic part comprises a plurality of electromagnets, the plurality of electromagnets are uniformly distributed in a spoke shape along the circumferential direction on the end face of the bearing stator, and each electromagnet of the plurality of electromagnets comprises a magnetic core arranged on the end face of the bearing stator and a coil wound on the magnetic core.
6. The micro gas turbine with balanced axial force configuration of claim 1, wherein: the bearing stator is supported in a shell covered on the front side of the compressor through a connecting rod.
7. The micro gas turbine with balanced axial force configuration of claim 1, wherein: and a pressure valve is arranged on the supplementary air inlet pipe.
8. The micro gas turbine with balanced axial force configuration of claim 1, wherein: the thrust disc and the thrust bearing are arranged in the middle of the rotating shaft; the number of the radial bearings is two, and the two radial bearings are arranged at two ends of the rotating shaft (24).
9. The micro gas turbine with the structure for balancing axial force according to claim 1 or 8, wherein: the thrust bearing further comprises a first bearing housing and a second bearing housing; the first bearing shell comprises an end part and a circumferential part, the end part is arranged at the outer end of the first bearing body, and the circumferential part is sealed and covered on the periphery of a radial bearing; the second bearing shell comprises a first cylindrical part and a second cylindrical part which are arranged in a stepped mode, the first cylindrical part covers the peripheries of the first bearing body and the second bearing body, and the second cylindrical part is sealed and covered on the periphery of the other radial bearing; the first circumferential part of the second bearing housing is axially fixed with the end part of the first bearing housing; the first bearing housing and/or the second bearing housing are stationary components.
10. The micro gas turbine with balanced axial force configuration of claim 9, wherein: and the first bearing shell or/and the second bearing shell is/are provided with pressure relief holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023021949.XU CN214366394U (en) | 2020-12-14 | 2020-12-14 | Micro gas turbine with axial force balancing structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023021949.XU CN214366394U (en) | 2020-12-14 | 2020-12-14 | Micro gas turbine with axial force balancing structure |
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| CN214366394U true CN214366394U (en) | 2021-10-08 |
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| CN202023021949.XU Active CN214366394U (en) | 2020-12-14 | 2020-12-14 | Micro gas turbine with axial force balancing structure |
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Effective date of registration: 20230418 Address after: 518063 10 Nanshan District Road, Gaoxin south, Nanshan District, Shenzhen, Guangdong. Patentee after: Liu Muhua Address before: 100176 room 1202a, 12 / F, block B, building 1, yard 19, Ronghua Middle Road, economic and Technological Development Zone, Daxing District, Beijing Patentee before: Jin Pu |