CN115450950A - Gas compressor and supercritical carbon dioxide power generation system - Google Patents

Gas compressor and supercritical carbon dioxide power generation system Download PDF

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Publication number
CN115450950A
CN115450950A CN202211389826.2A CN202211389826A CN115450950A CN 115450950 A CN115450950 A CN 115450950A CN 202211389826 A CN202211389826 A CN 202211389826A CN 115450950 A CN115450950 A CN 115450950A
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China
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sub
air flow
compressor
arrays
end cover
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CN202211389826.2A
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CN115450950B (en
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陈尧兴
叶绿
黄彦平
刘光旭
臧金光
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Nuclear Power Institute of China
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Nuclear Power Institute of China
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • F01K25/103—Carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/662—Balancing of rotors

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The application discloses a gas compressor and a supercritical carbon dioxide power generation system, wherein the gas compressor comprises a runner, an end cover, a balance component and a rotating shaft, and the end cover comprises a windward side and a leeward side; the end cover and the leeward side are arranged at intervals to form a first air flow channel; the balance member is connected with the leeward side of the rotating wheel and is arranged at intervals with the end cover, and is formed in a second air flow channel communicated with the first air flow channel, the second air flow channel comprises a plurality of first sub-channels and a plurality of second sub-channels, and the maximum cross-sectional area of the first sub-channels is smaller than that of the second sub-channels along the direction perpendicular to the air flow direction; the rotating wheel and the balance component are arranged on the outer side of the rotating shaft; the end cover and the rotating shaft are arranged at intervals to form a third air flow channel communicated with the second air flow channel. The compressor and the supercritical carbon dioxide power generation system can reduce the pressure difference on two sides of the runner, reduce the axial thrust generated by the runner and are beneficial to the safe and stable operation of the compressor.

Description

Gas compressor and supercritical carbon dioxide power generation system
Technical Field
The application belongs to the technical field of impeller machinery, and particularly relates to a gas compressor and a supercritical carbon dioxide power generation system.
Background
The supercritical carbon dioxide power generation system is a novel power generation technology, and the high density of the supercritical carbon dioxide working medium enables the system to have a compact structure and a small volume, and has a good application prospect and a good research value. One of the core devices of the supercritical carbon dioxide power generation system is a compressor. The inlet pressure of the compressor is close to a critical point (7.38 MPa, 31.1 ℃), and the outlet pressure is usually 14-20MPa according to the design, so that the axial thrust of a rotor acting on a rotating wheel of the compressor is overlarge due to the large pressure and high pressure difference between the inlet and the outlet of the compressor, the development of a supercritical carbon dioxide power generation system is restricted, and the supercritical carbon dioxide compressor is one of important characteristics of the supercritical carbon dioxide compressor different from the traditional gas compressor. In the prior art, a method generally adopted for reducing the axial thrust of the rotating wheel is to utilize a balance piston sealing structure to generate reverse thrust to balance the thrust generated by the rotating wheel, however, the axial length of the rotating wheel is obviously increased due to the introduction of the balance piston sealing structure, so that the size and the weight of equipment such as a gas compressor are greatly increased, and meanwhile, the critical rotating speed of a rotor can be greatly reduced due to overlong axial arrangement, so that the risk of critical instability exists, and therefore the common balance piston sealing structure is not beneficial to the stable operation of the gas compressor and a supercritical carbon dioxide power generation system.
Therefore, the search for a novel compressor balance structure is an important task for the development of the current compressor and the supercritical carbon dioxide power generation system.
Disclosure of Invention
The embodiment of the application provides a gas compressor and a supercritical carbon dioxide power generation system, which can reduce the pressure difference on two sides of a runner on the basis of not influencing the critical rotating speed of a shafting of the gas compressor, reduce the axial thrust generated by the runner and are beneficial to the safe and stable operation of the gas compressor.
The embodiment of the first aspect of the application provides a compressor, and the compressor comprises a runner, an end cover, a balance component and a rotating shaft. The rotating wheel comprises a windward side and a leeward side which are oppositely arranged; the end cover and the leeward side are arranged at intervals to form a first air flow channel; the balance member is connected with the leeward side of the rotating wheel, the balance member and the end cover are arranged at intervals to form a second air flow channel communicated with the first air flow channel, the second air flow channel comprises a plurality of first sub-channels and a plurality of second sub-channels, the first sub-channels and the second sub-channels are alternately arranged along the radial direction of the rotating wheel, and the maximum cross-sectional area of the first sub-channels along the vertical air flow direction is smaller than that of the second sub-channels along the vertical air flow direction; the rotating wheel and the balancing component are arranged on the outer side of the rotating shaft, and the rotating shaft is used for driving the rotating wheel and the balancing component to rotate relative to the end cover; the end cover and the rotating shaft are arranged at intervals to form a third air flow channel, and the third air flow channel is communicated with the second air flow channel.
According to an embodiment of the first aspect of the present application, the balancing member comprises a first surface and a cushion chamber, the first surface is arranged opposite to the end cover, the cushion chamber is arranged recessed towards the wheel with respect to the first surface, a first sub-channel is formed between the first surface and the end cover, and a second sub-channel is formed between the cushion chamber and the end cover.
According to any one of the previous embodiments of the first aspect of the present application, the number of the buffer cavities is multiple, and the multiple buffer cavities are arranged at intervals.
According to any one of the preceding embodiments of the first aspect of the present application, the plurality of buffer chambers are arranged to form a plurality of first arrays, the distance from the plurality of buffer chambers in the first arrays to the central axis of the balancing member is equal, the distance from two adjacent buffer chambers in the first arrays is equal, the first arrays are disposed around the central axis of the balancing member, and the plurality of first arrays are sequentially disposed along the radial direction of the balancing member.
According to any one of the preceding embodiments of the first aspect of the present application, the plurality of buffer cavities are arranged to form a plurality of second arrays, the plurality of buffer cavities in the second arrays are distributed along the radial direction of the balancing member and at equal intervals along the central axis of the balancing member towards the edge of the balancing member, and the plurality of second arrays are distributed in sequence along the circumferential direction of the balancing member around the central axis of the balancing member.
In accordance with any of the preceding embodiments of the first aspect of the present application, the cushion chamber is a helical groove disposed about a central axis of the balance member.
According to any one of the embodiments of the first aspect of the present application, the rotating shaft includes a first shaft portion and a second shaft portion, the rotating wheel is sleeved on the first shaft portion, the balancing member and the end cover are sleeved on the second shaft portion, and the diameter of the second shaft portion is larger than that of the first shaft portion.
In a second aspect of the present application, a supercritical carbon dioxide power generation system is provided, where the supercritical carbon dioxide power generation system includes the compressor in any one of the embodiments of the first aspect.
In the compressor and the supercritical carbon dioxide power generation system provided by the embodiment of the application, the balance member is arranged between the rotating wheel and the end cover, the balance member and the end cover are arranged at intervals to form a second air flow channel, the second air flow channel comprises a plurality of first sub-channels and a plurality of second sub-channels, the first sub-channels and the second sub-channels are alternately arranged along the radial direction of the rotating wheel, and the maximum cross-sectional area of the first sub-channels along the vertical air flow flowing direction is smaller than that of the second sub-channels along the vertical air flow flowing direction, so that the air flow velocity can be accelerated when the air flow flows through the first sub-channels, and the air pressure of the air flow is reduced. Meanwhile, the first sub-channel and the second sub-channel which are alternately arranged can accelerate and reduce the pressure of the airflow for multiple times, so that the pressure difference between the windward side and the leeward side of the runner is reduced, the axial thrust generated by the runner is reduced, and the safe and stable operation of the gas compressor is facilitated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a compressor according to an embodiment of the first aspect of the present application;
FIG. 2 is a schematic view of a balance member according to an embodiment of the first aspect of the present application;
FIG. 3 is a schematic view of another embodiment of a balancing member according to the first aspect of the present application;
FIG. 4 is a schematic structural view of another embodiment of a balancing member according to the first aspect of the present application;
fig. 5 is a schematic structural diagram of another compressor according to the first aspect of the present application.
Reference numerals are as follows:
10. a compressor; 1. a rotating wheel; 11. the windward side; 12. a leeward side; 2. an end cap; 3. a balance member; 31. a first surface; 32. a buffer chamber; 32a, buffer holes; 32b, a spiral groove; A. a first array; B. a second array; 4. a first air flow passage; 5. a second airflow channel; 51. a first sub-channel; 52. a second sub-channel; 6. a rotating shaft; 61. a first shaft portion; 62. a second shaft portion; d1, the diameter of the first shaft portion; d2, the diameter of the second shaft; 7. a third airflow channel; 8. an adjustment device; 81. an elastic member; 82. a stationary ring; 83. a movable ring.
Detailed Description
Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative only and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element.
The supercritical carbon dioxide power generation system has good application prospect and research value due to the advantages of high efficiency, small system volume and the like. One of the core devices of the supercritical carbon dioxide power generation system is a gas compressor, however, the excessive axial thrust of the rotor generated at the front side and the rear side of a runner of the gas compressor is an important problem which restricts the development of the supercritical carbon dioxide power generation system. In the prior art, a method generally adopted for reducing the axial thrust of the rotating wheel is to utilize a balance piston sealing structure to generate reverse thrust to balance the thrust generated by the rotating wheel, however, the axial length of the rotating wheel is obviously increased due to the introduction of the balance piston sealing structure, so that the size and the weight of equipment such as a gas compressor are greatly increased, and meanwhile, the critical rotating speed of a rotor can be greatly reduced due to overlong axial arrangement, so that the risk of critical instability exists, and therefore the common balance piston sealing structure is not beneficial to the stable operation of the gas compressor and a supercritical carbon dioxide power generation system.
In order to solve the above problems, embodiments of a compressor and a supercritical carbon dioxide power generation system are provided, and the following describes embodiments of the compressor and the supercritical carbon dioxide power generation system with reference to the accompanying drawings.
Referring to fig. 1 and 2, an embodiment of a first aspect of the present application provides a compressor 10, where the compressor 10 includes a runner 1, an end cover 2, a balance member 3, and a rotating shaft 6. The runner 1 comprises a windward side 11 and a leeward side 12 which are oppositely arranged; the end cover 2 is arranged at a distance from the leeward side 12 to form a first air flow channel 4; the balance member 3 is connected with the leeward side 12 of the runner 1, the balance member 3 is arranged at a distance from the end cover 2 to form a second air flow channel 5 communicated with the first air flow channel 4, the second air flow channel 5 comprises a plurality of first sub-channels 51 and a plurality of second sub-channels 52, the first sub-channels 51 and the second sub-channels 52 are alternately arranged along the radial direction of the runner 1, and the maximum cross-sectional area of the first sub-channels 51 along the vertical air flow direction X is smaller than the maximum cross-sectional area of the second sub-channels 52 along the vertical air flow direction X. The rotating wheel 1 and the balancing component 3 are arranged on the outer side of the rotating shaft 6, and the rotating shaft 6 is used for driving the rotating wheel 1 and the balancing component 3 to rotate relative to the end cover 2; the end cover 2 is arranged at a distance from the rotating shaft 6 to form a third air flow channel 7, and the third air flow channel 7 is communicated with the second air flow channel 5.
In this embodiment, the balance member 3 is connected to the runner 1, and the balance member 3 and the runner 1 may be integrally formed or may be separately formed and assembled. The end cover 2 is used for covering the rotating wheel 1 and the balancing member 3 and serves as a shell for protecting the rotating wheel 1 and the balancing member 3. Optionally, the interval between the balance member 3 and the end cover 2 is 0.5mm to 3mm.
The compressor 10 of the embodiment of the application is provided with the balance member 3 between the runner 1 and the end cover 2, the balance member 3 is arranged at an interval with the end cover 2 to form the second air flow channel 5, the second air flow channel 5 comprises a plurality of first sub-channels 51 and a plurality of second sub-channels 52, and the first sub-channels 51 and the second sub-channels 52 are alternately arranged along the radial direction of the runner 1. When the compressor 10 is operated, the leakage airflow pressurized by the compressor flows to the rotating shaft along the first airflow channel 4 and the second airflow channel 5 and then flows out along the surface of the rotating shaft. When the air flow flows through the second air flow channel 5, because the maximum cross-sectional area of the first sub-channel 51 along the vertical air flow direction X is smaller than the maximum cross-sectional area of the second sub-channel 52 along the vertical air flow direction X, when the air flow flows through the first sub-channel 51, the air flow velocity is accelerated, thereby reducing the air pressure of the air flow, and simultaneously, the first sub-channel 51 and the second sub-channel 52 which are alternately arranged can accelerate and reduce the pressure of the air flow for many times, thereby reducing the pressure difference between the windward side 11 and the leeward side 12 of the runner 1 of the compressor 10, further reducing the axial thrust generated by the runner 1 of the compressor 10, and being beneficial to the safe and stable operation of the compressor 10.
The rotating wheel 1 and the balancing member 3 are sleeved outside the rotating shaft 6, and the rotating shaft 6 is used for driving the rotating wheel 1 and the balancing member 3 to rotate relative to the end cover 2. The end cover 2 is arranged at a distance from the rotating shaft 6 to form a third air flow channel 7, and the third air flow channel 7 is communicated with the second air flow channel 5. There is the interval between the outer face of cylinder of pivot 6 and the end cover 2, avoids end cover 2 to influence pivot 6 and rotates. And a third airflow channel 7 communicated with the second airflow channel 5 is formed between the end cover 2 and the rotating shaft 6, and the third airflow channel 7 extends to the outside of the compressor 10 along the outer cylindrical surface of the rotating shaft 6 so that airflow flowing through the second airflow channel 5 is discharged from the third airflow channel 7. The spacing between the shaft 6 and the end cap 2 is not limiting in this application.
In some embodiments, the compressor 10 further comprises an adjusting device 8, and the adjusting device 8 is disposed at a port of the third air flow channel 7 far from the second air flow channel 5, and is used for adjusting the size of the port of the third air flow channel 7 far from the second air flow channel 5, so as to control the pressure at the outlet of the third air flow channel 7.
Optionally, the adjusting device 8 includes an elastic member 81, and a stationary ring 82 and a movable ring 83 connected to the elastic member 81. The rotating ring 83 is fixed on the rotating shaft 6 and rotates at the same speed as the rotating shaft 6, and the stationary ring 82 is connected with the stationary end cover 2 through the elastic member 81. When the rotating shaft 6 rotates at 0 rpm, the static ring 82 is tightly attached to the dynamic ring 83 by the pre-applied force of the elastic member 81. When the rotating shaft 6 starts to rotate, the pressure generated by the hydrodynamic effect between the moving ring 83 and the stationary ring 82 counteracts the prestress applied by the elastic member 81 to separate the moving ring 83 from the stationary ring 82. The adjusting device 8 adjusts the size of the leakage gap between the dynamic ring 83 and the static ring 82 by the hydrodynamic effect to control the pressure at the outlet of the third air flow channel 7. Optionally, the pressure drop at the outlet of the third airflow channel 7 is controlled to be 30% -50% of the sum of the pressure drops of the first airflow channel 4, the second airflow channel 5 and the third airflow channel 7, so as to avoid unbalance of the compressor 10 caused by reverse thrust generated by too low pressure drops of the first airflow channel 4 and the second airflow channel 5.
In some embodiments, the shaft 6 includes a first shaft portion 61 and a second shaft portion 62, the wheel 1 is disposed on the first shaft portion 61, the balance member 3 is disposed on the second shaft portion 62, and a diameter d2 of the second shaft portion 62 is greater than a diameter d1 of the first shaft portion 61. Because the diameter d2 of second shaft part 62 is greater than the diameter d1 of first shaft part 61, and the back of second shaft part 62 and runner 1 pastes mutually, the pressure effect area of air current at runner 1 back reduces to reduce the axial thrust that runner 1 back high-pressure draught produced, and then make the whole axial thrust in both sides reduce around the runner, make the operation of pivot 6 more stable. Optionally, the ratio of the diameter d2 of the second shaft portion 62 to the diameter d1 of the first shaft portion 61 is greater than or equal to 1.1.
In some embodiments, the balancing member 3 comprises a first surface 31 and a buffer cavity 32, the first surface 31 is arranged opposite to the end cap 2, the buffer cavity 32 is arranged concavely towards the direction approaching the rotor 1 relative to the first surface 31, a first sub-channel 51 is formed between the first surface 31 and the end cap 2, and a second sub-channel 52 is formed between the buffer cavity 32 and the end cap 2.
The balance member 3 is provided with the buffer cavity 32 to form a first sub-channel 51 and a second sub-channel 52, and the first sub-channel 51 and the second sub-channel 52 are alternately arranged, so that the effects of increasing the speed of the airflow for multiple times and reducing the air pressure of the airflow are achieved. Optionally, the buffer cavity 32 penetrates through the balance member 3, so that the buffer cavity 32 has a deeper depth, that is, on the basis that the surface spaced from the balance member 3 and the end cover 2 is a plane, the buffer cavity 32 penetrates through the balance member, so that the cross-sectional area of the second sub-passage 52 in the vertical airflow flowing direction X is maximized.
In some embodiments, the number of the buffer cavities 32 is plural, and the plural buffer cavities 32 are arranged at intervals. Referring to fig. 3, the buffer cavity 32 is an optional buffer hole 32a extending toward the direction close to the rotor 1 relative to the first surface 31, and a second sub-channel 52 is formed between the buffer hole 32a and the end cover 2. Because the buffer holes 32a are in a plurality of numbers, a plurality of second sub-channels 52 can be formed, a plurality of first sub-channels 51 are formed between the surface between the buffer holes 32a and the end cover 2, and in the flowing process of the airflow, the airflow flows through the first sub-channels 51 at intervals for a plurality of times, so that the flow speed can be increased for a plurality of times, the air pressure can be reduced, and the pressure reduction effect can be better. In addition, according to the conservation of circumferential momentum, the circumferential speed of the airflow in the flowing process towards the direction close to the rotating shaft is gradually increased along with the decrease of the moving radius of the airflow, and the buffer hole 32a on the balance member 3 can block the increase of the circumferential speed of the airflow in the downward moving process, so that the tangential instability of the rotating shaft can be prevented.
The buffer holes 32a have a circular, rectangular or elliptical shape in the vertical projection of the wheel 1. The shape of the buffer hole 32a projected on the wheel 1 may be circular, rectangular or elliptical, but may also be other shapes, such as diamond, parallelogram, trapezoid or other polygons. The different shapes of the buffer holes 32a have little influence on the speed increasing and pressure reducing effects of the airflow, but the more regular shapes are, the simpler the processing and manufacturing are. It is apparent that the circular buffer holes 32a are much easier to process than the rectangular or elliptical buffer holes 32 a.
In some embodiments, the plurality of buffer cavities 32 are arranged to form a plurality of first arrays a, the plurality of buffer cavities 32 in the first arrays a are equidistant from the central axis of the balancing member 3, two adjacent buffer cavities 32 in the first arrays a are equidistant, the first arrays a are disposed around the central axis of the balancing member 3, and the plurality of first arrays a are sequentially disposed along the radial direction of the balancing member 3. The plurality of buffer holes 32a in the first array A are arranged around the central axis of the balance member 3 at equal intervals, so that the production and the processing are facilitated, and on the other hand, the buffer holes 32a are uniformly arranged, when airflow flows through the balance member 3, multiple times of acceleration and depressurization can be uniformly performed, and the axial thrust generated by the runner 1 can be uniformly distributed on the balance member 3, so that the safe and stable operation of the air compressor 10 is facilitated.
Referring to fig. 4, in some embodiments, the plurality of buffer cavities 32 are arranged to form a second array B, the plurality of buffer cavities 32 in the second array B are distributed along the central axis of the balance member 3 in the radial direction of the balance member 3 toward the edge of the balance member 3 at equal intervals, and the plurality of second arrays B are distributed along the circumferential direction of the balance member 3 around the central axis of the balance member 3. In this embodiment, the cushion holes 32a are uniformly arranged along the radial direction of the balance member 3, and the balance of the compressor 10 during operation is better. Optionally, the number of the buffer holes 32a in each second array B is 4 to 12.
Referring to fig. 5, in some embodiments, the buffer chamber 32 is a spiral groove 32b disposed around the central axis of the balance member 3. In this example, the second sub-channel 52 is formed between the spiral groove 32b and the first surface 31, and the airflow spirally and alternately flows through the spiral groove 32b and the first surface 31 in the radial direction of the balance member 3, that is, the airflow alternately flows through the first sub-channel 51 and the second sub-channel 52, so that the multiple pressure reduction adjustment of the airflow is realized, and the axial thrust generated by the runner 1 is reduced.
Embodiments of the second aspect of the present application provide a supercritical carbon dioxide power generation system, which includes the compressor 10 of any one of the embodiments of the first aspect. The supercritical carbon dioxide power generation system applies the compressor 10 of the first aspect, and has the same beneficial effects as the compressor 10 of the embodiment of the first aspect, and the details are not repeated here.
As described above, only the specific embodiments of the present application are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered within the scope of the present application.

Claims (8)

1. A compressor, characterized in that the compressor comprises:
the rotating wheel comprises a windward side and a leeward side which are oppositely arranged;
an end cap spaced from the leeward side to form a first air flow channel;
a balance member connected to the leeward side of the rotor, the balance member being spaced from the end cover to form a second air flow passage in communication with the first air flow passage, the second air flow passage including a plurality of first sub-passages and a plurality of second sub-passages, the first sub-passages and the second sub-passages being alternately arranged in a radial direction of the rotor, a maximum cross-sectional area of the first sub-passages in a direction perpendicular to a flow direction of the air flow being smaller than a maximum cross-sectional area of the second sub-passages in the direction perpendicular to the flow direction of the air flow;
the rotating wheel and the balancing component are arranged on the outer side of the rotating shaft, and the rotating shaft is used for driving the rotating wheel and the balancing component to rotate relative to the end cover; the end cover and the rotating shaft are arranged at intervals to form a third airflow channel, and the third airflow channel is communicated with the second airflow channel.
2. The compressor of claim 1, wherein the balance member includes a first surface and a cushion chamber, the first surface is disposed opposite the end cap, the cushion chamber is recessed relative to the first surface in a direction toward the wheel, the first surface and the end cap define the first sub-passage therebetween, and the cushion chamber and the end cap define the second sub-passage therebetween.
3. The compressor of claim 2, wherein the number of the buffer cavities is multiple, and the multiple buffer cavities are arranged at intervals.
4. The compressor of claim 3, wherein the plurality of buffer cavities are arranged to form a plurality of first arrays, the plurality of buffer cavities in the first arrays are equidistant from the central axis of the balance member, adjacent two buffer cavities in the first arrays are equidistant from each other, the first arrays are disposed around the central axis of the balance member, and the plurality of first arrays are sequentially disposed along the radial direction of the balance member.
5. The compressor of claim 3, wherein a plurality of the buffer cavities are arranged to form a plurality of second arrays, the plurality of buffer cavities in the second arrays are distributed along the radial direction of the balancing member from the central axis of the balancing member to the edge of the balancing member at equal intervals, and the plurality of second arrays are distributed in sequence along the circumferential direction of the balancing member around the central axis of the balancing member.
6. The compressor of claim 2, wherein the cushion chamber is a helical groove disposed about a central axis of the balance member.
7. The compressor of claim 1, wherein the shaft includes a first shaft portion and a second shaft portion, the rotor is sleeved on the first shaft portion, the balancing member and the end cap are sleeved on the second shaft portion, and a diameter of the second shaft portion is larger than a diameter of the first shaft portion.
8. A supercritical carbon dioxide power generation system, characterized in that the supercritical carbon dioxide power generation system comprises a compressor according to any one of claims 1-7.
CN202211389826.2A 2022-11-08 2022-11-08 Gas compressor and supercritical carbon dioxide power generation system Active CN115450950B (en)

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