CN110630535B - A direct-drive two-stage supercritical carbon dioxide compressor - Google Patents
A direct-drive two-stage supercritical carbon dioxide compressor Download PDFInfo
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- CN110630535B CN110630535B CN201911062926.2A CN201911062926A CN110630535B CN 110630535 B CN110630535 B CN 110630535B CN 201911062926 A CN201911062926 A CN 201911062926A CN 110630535 B CN110630535 B CN 110630535B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 138
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 69
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 69
- 230000006835 compression Effects 0.000 claims abstract description 17
- 238000007906 compression Methods 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims description 57
- 238000001816 cooling Methods 0.000 claims description 28
- 244000126211 Hericium coralloides Species 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000001050 lubricating effect Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 26
- 238000010586 diagram Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
- F04D29/122—Shaft sealings using sealing-rings especially adapted for elastic fluid pumps
- F04D29/124—Shaft sealings using sealing-rings especially adapted for elastic fluid pumps with special means for adducting cooling or sealing fluid
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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
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/10—Centrifugal pumps for compressing or evacuating
- F04D17/12—Multi-stage pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
- F04D25/163—Combinations of two or more pumps ; Producing two or more separate gas flows driven by a common gearing arrangement
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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
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/056—Bearings
- F04D29/057—Bearings hydrostatic; hydrodynamic
-
- 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
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/102—Shaft sealings especially adapted for elastic fluid pumps
-
- 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
- F04D29/266—Rotors specially for elastic fluids mounting compressor rotors on shafts
-
- 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
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Power Engineering (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
本发明公开了一种直驱两级超临界二氧化碳压缩机，具有结构紧凑，效率高，噪音小的优点。一种直驱两级超临界二氧化碳压缩机，其特征在于：所述高速电机包括电机外壳以及电机外壳内设置的定子、转子、空气轴承系统，所述高速电机的两端分别设置一级压缩机、二级压缩机，所述一级压缩机、二级压缩机的叶轮均安装在高速电机的转子上，所述一级压缩机、二级压缩机串联，形成压缩系统，一级压缩机的进气口作为压缩系统的进气口，二级压缩机的出气口作为压缩系统的出气口。
The present invention discloses a direct-driven two-stage supercritical carbon dioxide compressor, which has the advantages of compact structure, high efficiency and low noise. A direct-driven two-stage supercritical carbon dioxide compressor, characterized in that: the high-speed motor includes a motor housing and a stator, a rotor and an air bearing system arranged in the motor housing, a primary compressor and a secondary compressor are respectively arranged at both ends of the high-speed motor, the impellers of the primary compressor and the secondary compressor are both installed on the rotor of the high-speed motor, the primary compressor and the secondary compressor are connected in series to form a compression system, the air inlet of the primary compressor serves as the air inlet of the compression system, and the air outlet of the secondary compressor serves as the air outlet of the compression system.
Description
Technical Field
The invention relates to the technical field of supercritical carbon dioxide power generation systems, in particular to a direct-drive two-stage supercritical carbon dioxide compressor.
Background
Since the first industrial revolution, the main way of using thermal energy is to convert thermal energy into mechanical energy through a power system, which provides power for human activities. The supercritical carbon dioxide power generation system is one kind of power system, and is characterized by that it uses supercritical carbon dioxide as working medium to convert heat quantity of heat source into mechanical energy, and its heat source can come from nuclear reactor, solar energy, geothermal energy, industrial waste heat and chemical dye combustion, etc.. The excellent characteristics of the supercritical carbon dioxide working medium lead the system to have good application prospect and research value. Since carbon dioxide can only become supercritical when the temperature reaches 31.1 ℃ and the pressure reaches 7.38 Mpa. Therefore, in the current supercritical carbon dioxide power generation system, the compressor belongs to a key component in the whole system, the efficiency of the compressor has great influence on the efficiency of the whole system, high technologies such as a high-speed permanent magnet motor, a gas bearing, a two-stage impeller and the like are integrated, and the power density of the compressor is high due to high rotating speed, and the size of the compressor is far smaller than that of a common compressor with the same power, so that materials can be effectively saved. In addition, the motor is connected with the prime motor, a traditional speed increasing mechanism is omitted, the transmission efficiency is high, and the noise is low. However, the development of supercritical carbon dioxide compressors is restricted by a series of shafting dynamics and bearing problems caused by high-speed rotating machinery and sealing problems caused by high-pressure working conditions.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the direct-drive two-stage supercritical carbon dioxide compressor which has the advantages of compact structure, high efficiency and low noise.
The purpose of the invention is realized in the following way:
A direct-drive two-stage supercritical carbon dioxide compressor is characterized in that the high-speed motor comprises a motor shell, a stator, a rotor and an air bearing system, wherein the stator, the rotor and the air bearing system are arranged in the motor shell, a first-stage compressor and a second-stage compressor are respectively arranged at two ends of the high-speed motor, impellers of the first-stage compressor and the second-stage compressor are respectively arranged on the rotor of the high-speed motor, the first-stage compressor and the second-stage compressor are connected in series to form a compression system, an air inlet of the first-stage compressor serves as an air inlet of the compression system, and an air outlet of the second-stage compressor serves as an air outlet of the compression system.
Preferably, the air bearing system uses supercritical carbon dioxide as a lubricating medium, the motor shell is provided with a bearing air inlet hole and a bearing air outlet hole, the bearing air inlet hole is used for introducing the supercritical carbon dioxide into the air bearing system, and the bearing air outlet hole is used for discharging the supercritical carbon dioxide.
Preferably, the bearing air inlet hole is connected with the air outlet of the secondary compressor and used for introducing supercritical carbon dioxide into the air bearing system to lubricate the air bearing system, and the bearing air outlet hole is connected with the air inlet of the primary compressor and used for converging the supercritical carbon dioxide exhausted by the air bearing system into the compression system.
Preferably, an air storage tank and a pressure control valve are sequentially connected in series between the air outlet of the secondary compressor and the bearing air inlet, the air storage tank is used for storing supercritical carbon dioxide, and the pressure control valve is used for controlling the pressure of the supercritical carbon dioxide which is introduced into the air bearing system.
Preferably, a suction pump is connected between the bearing exhaust hole and the air inlet of the primary compressor, and is used for converging supercritical carbon dioxide exhausted by the air bearing system into the compression system.
Preferably, the stator comprises a stator core and a stator coil, a stator cooling channel is arranged in the stator core, a stator cooling air inlet and a stator cooling air outlet are arranged on the motor shell, the stator cooling air inlet and the stator cooling air outlet are communicated with the stator cooling channel, the stator cooling air inlet is connected with an air outlet of a secondary compressor and used for introducing supercritical carbon dioxide into the stator cooling channel to cool the stator, and the stator cooling air outlet is connected with an air inlet of a primary compressor and used for converging the supercritical carbon dioxide in the stator cooling channel into a compression system.
Preferably, dry gas sealing devices are respectively arranged between the motor shell and the shell of the primary compressor and between the motor shell of the primary compressor and the motor shell of the secondary compressor;
The dry gas sealing device comprises a cylindrical mounting shell, two ends of the mounting shell are fixedly connected with a motor shell and a shell of a primary compressor/a shell of a secondary compressor respectively, a cylindrical dry gas sealing bearing shell is arranged in the mounting shell, a part of a rotor of the high-speed motor corresponding to the dry gas sealing bearing shell is a stepped shaft, a T-shaped shaft sleeve is sleeved on a small diameter section of the stepped shaft, a dry gas sealing movable ring and a dry gas sealing stationary ring are sleeved between the small diameter section of the shaft sleeve and the dry gas sealing bearing shell, the dry gas sealing movable ring is fixed on the shaft sleeve, the dry gas sealing stationary ring is fixed on the dry gas sealing bearing shell, a high-pressure end comb tooth seal is arranged between a large diameter section of the shaft sleeve and the dry gas sealing bearing shell, and a low-pressure end comb tooth seal is arranged between a large diameter section of the stepped shaft and the dry gas sealing bearing shell;
The device comprises a mounting shell, and is characterized in that a sealing air inlet, a sealing air outlet and a balancing air inlet are arranged on the mounting shell, the sealing air inlet, the sealing air outlet and the balancing air inlet are connected with a pressure control system and an air outlet of a secondary compressor in sequence, the sealing air inlet is used for leading supercritical carbon dioxide from the air outlet of the secondary compressor, a first through hole is arranged on the dry air sealing pressure-bearing shell and used for leading the supercritical carbon dioxide led in by the sealing air inlet into space between a high-pressure end comb tooth seal and a dry air sealing movable ring and a dry air sealing stationary ring, the sealing air outlet is used for discharging the supercritical carbon dioxide which sequentially passes through a gap between the dry air sealing movable ring and the dry air sealing stationary ring, a gap between the dry air sealing pressure-bearing shell and a small diameter section of a stepped shaft and a gap between the dry air sealing pressure-bearing shell and a low-pressure end comb tooth seal, and a second through hole is arranged on the low-pressure end comb tooth seal and used for leading the supercritical carbon dioxide of the balancing air inlet into the middle part of the low-pressure end comb tooth seal to balance air pressure.
Preferably, the air bearing system comprises a pure radial bearing, a radial-thrust combined bearing and a pure thrust bearing, wherein the pure radial bearing is positioned at one end of the rotor, the radial-thrust combined bearing and the pure thrust bearing are positioned at the other end of the rotor, and the pure thrust bearing is positioned at the inner side of the radial-thrust combined bearing.
Preferably, the primary compressor and the secondary compressor each have a diffuser located between the air inlet of the compressor and the compressor wheel.
Preferably, the air compressing impeller is circumferentially fixed at the end part of the rotor through involute teeth arranged in the axial hole, and is tightly fixed through the cooperation of the torque transmission pull rod and the locking nut.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
The compressor structure provided by the invention has the advantages that the motor and the air compressing impeller are coaxially connected with the sealing structure, a traditional mode that the gear box is connected with the motor through the coupler is eliminated, the structure is compact and simple, the power density is high, and the like, bearing air exhaust is introduced into air flow of an air inlet of the compressor, zero leakage is realized, and meanwhile, the compressor disclosed by the invention has the advantages that oil and air are not contained in the whole experimental prototype, and the compressor is suitable for compression of microminiature supercritical carbon dioxide.
Drawings
FIG. 1 is an overall block diagram of the present invention;
FIG. 2 is a diagram of the dry gas seal configuration of the present invention;
FIG. 3 is a view of the impeller mounting structure of the present invention;
FIG. 4 shows an impeller according to the invention involute tooth schematic diagram;
FIG. 5 is a flow path diagram of supercritical carbon dioxide according to the present invention.
Detailed Description
Referring to fig. 1-5, a direct-drive two-stage supercritical carbon dioxide compressor comprises a first-stage compressor, a second-stage compressor, a dry gas sealing device and a high-speed motor, wherein an air bearing system of the high-speed motor takes supercritical carbon dioxide as a lubricating medium.
The two ends of the high-speed motor are respectively provided with a first-stage compressor 11a and a second-stage compressor 11b, supercritical carbon dioxide enters from the air inlet of the first-stage compressor, the high-speed motor drives a first-stage air compressing impeller 12a to compress and apply work to the supercritical carbon dioxide, then enters the air inlet of the second-stage compressor 11b from the air outlet of the first-stage compressor 11a, and is compressed and applied again by the second-stage air compressing impeller 12 b.
The motor housing 35 is provided with bearing air intake holes for introducing supercritical carbon dioxide from outside the housing to the bearing system, and bearing air exhaust holes for discharging the supercritical carbon dioxide discharged from the bearing system out of the housing.
The bearing air inlet hole is connected with the air outlet of the secondary compressor and is used for diverting part of supercritical carbon dioxide from the supercritical carbon dioxide air flow at the air outlet of the compressor to be introduced into the bearing 31, and the bearing air outlet hole is connected with the air inlet of the primary compressor and is used for converging the supercritical carbon dioxide discharged from the bearing system into the air flow at the air inlet of the primary compressor.
The device comprises a compressor, a bearing air inlet, a bearing air outlet, a compressor air inlet, a pressure control valve, a suction pump and a suction pump, wherein the air storage tank and the pressure control valve are arranged between the compressor air outlet and the bearing air inlet, the air storage tank inlet is connected with the compressor air outlet and is used for storing part of supercritical carbon dioxide split from supercritical carbon dioxide air flow at the compressor air outlet, the pressure control valve is connected between the air storage tank air outlet and the bearing air inlet and is used for controlling the pressure of the supercritical carbon dioxide introduced into the bearing, and the suction pump is arranged between the bearing air outlet and the compressor air inlet and is used for converging the supercritical carbon dioxide discharged by the bearing into the air flow at the compressor air inlet.
The stator 32 comprises a stator core and a stator coil, a stator cooling channel is arranged in the stator core, a stator cooling air inlet and a stator cooling air outlet which are communicated to the outside of the motor shell from the stator cooling channel are formed in the motor shell, the stator cooling air inlet is connected with a compressor air inlet and used for introducing low-temperature supercritical carbon dioxide of the compressor air inlet into the stator cooling channel to cool the stator, and the stator cooling air outlet is connected with the compressor air inlet and used for introducing the supercritical carbon dioxide in the stator cooling channel back to the compressor air inlet.
The first stage 11a and the second stage 11b of the compressor head respectively comprise a first diffuser 13a and a second diffuser 13b, the supercritical carbon dioxide working medium firstly enters from the air inlet of the first stage compressor head 11a and is introduced into the air compressing impeller 12a through the first diffuser 13a, so that the supercritical carbon dioxide is compressed and works, the compressed supercritical carbon dioxide is introduced into the air inlet of the second stage compressor 11b through the air outlet of the first stage compressor 11a, and then is introduced into the second air compressing impeller 12b through the diffuser 13b of the second stage compressor, so that the supercritical carbon dioxide is compressed and works.
The rotor comprises a permanent magnet rotating shaft 36, a dry gas sealing shaft sleeve 38, a dry gas sealing movable ring 37, a primary air compressing impeller 12a and a secondary air compressing impeller 12b which are respectively fixed at two ends of the rotating shaft 36 in a mode of matching and tensioning by a torque transmission pull rod 14 of involute teeth 16 and a locking nut 15.
The dry gas seal is arranged between the motor and the compressor, wherein the dry gas seal comprises a dry gas seal mounting shell 25, a dry gas seal pressure-bearing shell 26, a high-pressure end comb tooth seal 28, a shaft sleeve 38, a dry gas seal movable ring 37, a dry gas seal static ring 27, a low-pressure end comb tooth seal 24, supercritical carbon dioxide gas is led out from a compressor air outlet, enters a main seal air inlet 21 through a pressure control system, is discharged from a seal air outlet 22 and is led into a compressor air inlet, dry gas seal balance gas enters from a balance air inlet 23, and high-pressure end comb tooth seals 28 and low-pressure end comb tooth seals 24 are respectively arranged at two ends of the seal.
The air bearing system comprises a pure radial bearing 31, a radial-thrust combined bearing 34 and a pure thrust bearing 33, wherein the pure radial bearing 31 is sleeved between a motor shell 35 and a permanent magnet rotating shaft 36, the radial-thrust combined bearing 34 and the pure thrust bearing 33 are connected to the other end of the permanent magnet rotating shaft, and the pure radial bearing 31 is sleeved between the motor shell 35 and the permanent magnet rotating shaft 36.
Finally, it is noted that the above-mentioned preferred embodiments are only intended to illustrate rather than limit the invention, and that, although the invention has been described in detail by means of the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (5)
1. The direct-drive two-stage supercritical carbon dioxide compressor is characterized in that a high-speed motor comprises a motor shell, a stator, a rotor and an air bearing system, wherein the stator, the rotor and the air bearing system are arranged in the motor shell, a first-stage compressor and a second-stage compressor are respectively arranged at two ends of the high-speed motor, air compression impellers of the first-stage compressor and the second-stage compressor are respectively arranged on the rotor of the high-speed motor, the first-stage compressor and the second-stage compressor are connected in series to form a compression system, an air inlet of the first-stage compressor serves as an air inlet of the compression system, and an air outlet of the second-stage compressor serves as an air outlet of the compression system;
The air bearing system takes supercritical carbon dioxide as a lubricating medium, the motor shell is provided with a bearing air inlet hole and a bearing air outlet hole, the bearing air inlet hole is used for introducing the supercritical carbon dioxide into the air bearing system, and the bearing air outlet hole is used for discharging the supercritical carbon dioxide;
The bearing air inlet hole is connected with the air outlet of the secondary compressor and is used for introducing supercritical carbon dioxide into the air bearing system to lubricate the air bearing system, and the bearing air outlet hole is connected with the air inlet of the primary compressor and is used for converging the supercritical carbon dioxide exhausted by the air bearing system into the compression system;
An air storage tank and a pressure control valve are sequentially connected in series between an air outlet of the secondary compressor and an air inlet of the bearing, the air storage tank is used for storing supercritical carbon dioxide, and the pressure control valve is used for controlling the pressure of the supercritical carbon dioxide which is introduced into the air bearing system;
a suction pump is connected between the bearing exhaust hole and the air inlet of the primary compressor and used for converging low-pressure supercritical carbon dioxide exhausted by the air bearing system into the compression system;
The stator comprises a stator core and a stator coil, wherein a stator cooling channel is arranged in the stator core, a stator cooling air inlet and a stator cooling air outlet are formed in a motor shell, the stator cooling air inlet and the stator cooling air outlet are communicated with the stator cooling channel, the stator cooling air inlet is connected with an air outlet of a secondary compressor and used for introducing supercritical carbon dioxide into the stator cooling channel to cool the stator, and the stator cooling air outlet is connected with an air inlet of a primary compressor and used for converging the supercritical carbon dioxide in the stator cooling channel into a compression system.
2. The direct-drive two-stage supercritical carbon dioxide compressor as set forth in claim 1, wherein dry gas sealing devices are respectively arranged between the motor shell and the shell of the primary compressor and between the motor shell and the shell of the secondary compressor;
The dry gas sealing device comprises a cylindrical mounting shell, two ends of the mounting shell are fixedly connected with a motor shell and a shell of a primary compressor/a shell of a secondary compressor respectively, a cylindrical dry gas sealing bearing shell is arranged in the mounting shell, a part of a rotor of the high-speed motor corresponding to the dry gas sealing bearing shell is a stepped shaft, a T-shaped shaft sleeve is sleeved on a small diameter section of the stepped shaft, a dry gas sealing movable ring and a dry gas sealing stationary ring are sleeved between the small diameter section of the shaft sleeve and the dry gas sealing bearing shell, the dry gas sealing movable ring is fixed on the shaft sleeve, the dry gas sealing stationary ring is fixed on the dry gas sealing bearing shell, a high-pressure end comb tooth seal is arranged between a large diameter section of the shaft sleeve and the dry gas sealing bearing shell, and a low-pressure end comb tooth seal is arranged between a large diameter section of the stepped shaft and the dry gas sealing bearing shell;
The device comprises a mounting shell, and is characterized in that a sealing air inlet, a sealing air outlet and a balancing air inlet are arranged on the mounting shell, the sealing air inlet, the sealing air outlet and the balancing air inlet are connected with an air outlet of a pressure control system and an air outlet of a secondary compressor in sequence, the sealing air inlet is used for leading supercritical carbon dioxide from the air outlet of the secondary compressor, a first through hole is arranged on the dry air sealing pressure-bearing shell and used for leading the supercritical carbon dioxide led in by the sealing air inlet into space between a high-pressure end comb tooth seal and a dry air sealing movable ring and a dry air sealing stationary ring, the sealing air outlet is used for discharging the supercritical carbon dioxide which sequentially passes through a gap between the dry air sealing movable ring and the dry air sealing stationary ring, a gap between the dry air sealing pressure-bearing shell and a small-diameter section of a stepped shaft and a gap between the dry air sealing pressure-bearing shell and a low-pressure end comb tooth seal, and a second through hole is arranged on the low-pressure end comb tooth seal and used for leading the supercritical carbon dioxide which isolates the air inlet into the middle part of the low-pressure end comb tooth seal to isolate atmosphere.
3. The direct-drive two-stage supercritical carbon dioxide compressor of claim 1, wherein the air bearing system comprises a pure radial bearing, a radial-thrust combined bearing and a pure thrust bearing, the pure radial bearing is positioned at one end of the rotor, the radial-thrust combined bearing and the pure thrust bearing are positioned at the other end of the rotor, and the pure thrust bearing is positioned at the inner side of the radial-thrust combined bearing.
4. A direct drive two stage supercritical carbon dioxide compressor as set forth in claim 1 wherein said primary and secondary compressors each have a diffuser located between the compressor inlet and the compressor wheel.
5. The direct-drive two-stage supercritical carbon dioxide compressor of claim 1, wherein the gas-compressing impeller is circumferentially fixed at the end part of the rotor through involute teeth arranged in the axial holes and is tightly fixed through the cooperation of a torque transmission pull rod and a locking nut.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911062926.2A CN110630535B (en) | 2019-10-31 | 2019-10-31 | A direct-drive two-stage supercritical carbon dioxide compressor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911062926.2A CN110630535B (en) | 2019-10-31 | 2019-10-31 | A direct-drive two-stage supercritical carbon dioxide compressor |
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| CN110630535A CN110630535A (en) | 2019-12-31 |
| CN110630535B true CN110630535B (en) | 2025-03-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111577399A (en) * | 2020-04-29 | 2020-08-25 | 中国核动力研究设计院 | Supercritical carbon dioxide turbine shaft end sealing method and device for double dry gas seals |
| CN112555171B (en) * | 2020-12-22 | 2025-03-04 | 中船(重庆)装备技术有限公司 | A non-cooling super-turbine compressor for solar power generation |
| CN115324669A (en) * | 2022-09-01 | 2022-11-11 | 哈电发电设备国家工程研究中心有限公司 | Supercritical carbon dioxide centripetal turbine structure adaptive to 600-DEG C air inlet |
| CN118381255A (en) * | 2024-06-26 | 2024-07-23 | 浙江欧拉动力科技有限公司 | High-speed motor cooling method for refrigeration compressor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN211039087U (en) * | 2019-10-31 | 2020-07-17 | 重庆江增船舶重工有限公司 | Direct-drive two-stage supercritical carbon dioxide compressor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10232100A1 (en) * | 2001-07-25 | 2003-02-13 | Mohawk Innovative Tech Inc | Oil-free compressor for running as a two-step radial compressor, has an electric motor with a rotor connected to a shaft for driving the compressor with a direct drive. |
| JP2005345083A (en) * | 2004-06-04 | 2005-12-15 | Shigeto Matsuo | Liquid-side energy recovering system of refrigeration air conditioner |
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2019
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211039087U (en) * | 2019-10-31 | 2020-07-17 | 重庆江增船舶重工有限公司 | Direct-drive two-stage supercritical carbon dioxide compressor |
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