CN209838711U - Semi-open centrifugal compressor for micro volume flow supercritical working medium - Google Patents
Semi-open centrifugal compressor for micro volume flow supercritical working medium Download PDFInfo
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- CN209838711U CN209838711U CN201920529481.3U CN201920529481U CN209838711U CN 209838711 U CN209838711 U CN 209838711U CN 201920529481 U CN201920529481 U CN 201920529481U CN 209838711 U CN209838711 U CN 209838711U
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Abstract
The utility model discloses a semi-open centrifugal compressor for micro volume flow supercritical working medium, the device comprises a centrosymmetric partial air inlet semi-open type impeller compressor, a motor, a main shaft support, a thrust bearing, a dry gas seal, a comb seal, a compressor shell, a static blade, a movable blade, a semi-open type through-flow channel, a non-through-flow channel, a dry gas storage tank and a dry gas seal pipeline, the utility model adopts the partial air inlet semi-open type impeller which is the centrosymmetric through-flow channel to compress the supercritical working medium with small volume flow of high pressure grade, has the advantages of large blade height size, extremely small external leakage flow and simple processing, is easier to process and has lower cost than the partial air inlet closed type impeller, the supercritical working medium can be efficiently compressed at a plurality of rotating speeds, and the difficult problems of low energy efficiency and difficult realization of the compression of the high-pressure-level supercritical working medium with small volume flow can be solved.
Description
Technical Field
The utility model relates to a supercritical working medium compression technical field, concretely relates to small volume flow supercritical working medium semi-open centrifugal compression device.
Background
In a supercritical carbon dioxide Brayton cycle or Allam cycle test system, the design pressure is between 20 and 32MPa, the system energy density is high, and the volume of compressor equipment is small. For the advanced cycle test system with high design pressure parameters, the inlet parameters of the compressor are mostly selected near the critical point, and in order to reduce the test cost, the volume flow of the supercritical working medium is often smaller under the design working conditions of many research institutions, so that the blade height of the supercritical working medium compressor is too small, and the compression efficiency is low. The prior art can only provide a feasible scheme for the compression of the micro volume flow gas working medium with the design parameter below 5MPa, namely, a screw compression mode is adopted, and for the compression mode of the micro volume flow gas working medium with the design parameter more than 10MPa, the centrifugal compressor designed in the prior centrifugal compressor mode has over-short blade height and low isentropic compression efficiency. The prior art does not provide a scheme for compressing the supercritical working medium with high pressure grade, low cost and high efficiency and small volume flow.
Disclosure of Invention
The utility model aims at providing a half open centrifugal compressor arrangement of small volume flow supercritical working medium just in order to solve above-mentioned problem, can realize carrying out high-efficient compression with small volume flow's high pressure level supercritical working medium.
The utility model discloses a following technical scheme realizes above-mentioned purpose:
the semi-open type centrifugal compression device for the micro-volume-flow supercritical working medium comprises a thrust bearing 1, a main shaft 2, a first main shaft support 3-1, a second main shaft support 3-2, a motor 4, a dry gas seal 5, a comb seal 6, a compressor shell 7, a stationary blade 8, a through-flow channel outlet 9, a moving blade 10, a semi-open type through-flow channel 11, a non-through-flow channel 12, a compressor runner 13, a dry gas storage tank 14, a dry gas seal pipeline 15 and a central symmetrical local air inlet semi-open type impeller compressor 16, wherein the thrust bearing 1, the first main shaft support 3-1, the motor 4, the second main shaft support 3-2 and the central symmetrical local air inlet semi-open type impeller compressor 16 are sequentially arranged on the main shaft 2 from one end of the main shaft 2; the centrosymmetric partial air inlet semi-open type impeller compressor 16 comprises a dry air seal 5, a comb seal 6, a compressor shell 7, a static blade 8, a moving blade 10 and a compressor runner 13, wherein the moving blade 10 is installed on the compressor runner 13, the moving blade 10 and the compressor runner 13 form a compressor impeller, a processing surface on one side of the moving blade 10 or a side processing surface of the compressor runner 13, a bottom processing surface of the compressor runner 13 and a processing surface on one side of another adjacent moving blade 10 or a side processing surface of the compressor runner 13 form an expanding type U-shaped semi-open type through flow channel 11, an unprocessed part on the compressor runner 13 is a non-through flow channel 12, a through flow channel outlet 9 is arranged at the tail end of the semi-open type through flow channel 11, and the static blade 8 is installed on the compressor shell 7 on the outer side of the through flow channel outlet 9 in the; the dry gas storage tank 14 is connected with the dry gas seal 5 through a dry gas seal pipeline 15, the dry gas seal 5, the comb tooth seal 6 and an impeller with moving blades 10 of a central symmetrical partial-intake semi-open type impeller compressor 16 are sequentially positioned on the main shaft 2, and the dry gas seal 5 is close to the second main shaft support 3-2.
The number of the semi-open type through-flow channels 11 of the centrosymmetric partial air inlet semi-open type impeller compressor 16 is an even number which is more than or equal to 2, and the two semi-open type through-flow channels 11 which are opposite in position are in a space centrosymmetric structure with the central line of the main shaft as the central line.
The air intake mode of the centrosymmetric partial air intake semi-open type impeller compressor 16 is axial air intake and radial air outlet.
The motor 4 has 2 or more pole pairs and is capable of operating at 1 or more rotational speeds.
The centrosymmetric partial air intake semi-open type impeller compressor 16 adopts a leakage control mode in one section or multiple sections of comb seals 6, at least one section of comb seal 6 is arranged on the main shaft 2, and the rest comb seals 6 are selectively arranged at any gap between the compressor impeller of the centrosymmetric partial air intake semi-open type impeller compressor 16 and the compressor shell 7.
The working method of the micro-volume-flow supercritical working medium semi-open type centrifugal compression device mainly comprises three processes, namely a preparation stage, an operation stage and a shutdown stage, wherein in the preparation stage, lubricating oil is supplied to a first main shaft support 3-1 and a second main shaft support 3-2 by an oil supply system, and high-pressure pure gas is sealed 5 by a dry gas storage tank 14 through a dry gas sealing pipeline 15; after the operation is ready, the operation stage is started, the motor 4 is started and rapidly rises to the designed rotating speed, the supercritical working medium flowing in along the axial inlet of the compressor shell 7 is sucked into the inlet of the semi-open through-flow channel 11 of the compressor impeller, is subjected to speed-rising diffusion along the expanding type semi-open through-flow channel 11 to the through-flow channel outlet 9, then enters the stationary blade 8 channel on the compressor shell 7 for speed reduction and pressure rise, and then flows out of the centrosymmetric partial air inlet semi-open impeller compressor 16 from the radial outlet of the compressor shell 7; in the shutdown stage, the motor 4 stops providing power, the centrosymmetric partial-air-intake semi-open type impeller compressor 16 stops rapidly, after the centrosymmetric partial-air-intake semi-open type impeller compressor 16 stops, the dry gas storage tank 14 stops supplying high-pressure pure gas to the dry gas seal 5, and the oil supply system stops working after the first main shaft support 3-1 and the second main shaft support 3-2 are supplied with lubricating oil for post-lubrication for 20 minutes.
The beneficial effects of the utility model reside in that:
at present, a scheme for efficiently compressing a micro-volume-flow supercritical working medium at a high pressure level in a supercritical carbon dioxide Brayton cycle or Allam cycle test system is not available. The utility model provides a low, the high super critical working medium semi-open centrifugal compression device of small volume flow of maneuverability, the utility model discloses a centrifugal compressor rotor of the local inlet channel of a pair of or many pairs of central symmetry of design can realize carrying out high-efficient compression with the high pressure level super critical working medium of small volume flow. Compared with the centrifugal compressor with the same design parameters and full-circumference air intake, the utility model adopts the scheme of the partial air intake centrifugal compressor to improve the height of the blade, thereby having the advantage of large blade height and size, avoiding the pneumatic loss caused by too low blade height, and having high isentropic compression efficiency; compared with the closed type local air inlet compressor impeller, the utility model has lower cost; simultaneously the utility model discloses a dry gas sealing device has and leaks the working medium flow and be close to zero's advantage outward, adopts the motor of a pair of or many pairs of magnetic poles, makes small volume flow supercritical medium semi-open centrifugal compression device can high-efficiently work under a plurality of rotational speeds, according to test system's parameter requirement, provides multiple pressure and working medium flow parameter.
Drawings
Fig. 1 is a schematic diagram of the semi-open centrifugal compressor for small volume flow supercritical working medium of the present invention.
Fig. 2 is a left side view of the compressor impeller of the half-open type centrifugal compressor for small volume flow supercritical working medium of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
as shown in fig. 1 and fig. 2, the semi-open centrifugal compressor device for micro volume flow supercritical working medium of the present invention comprises a thrust bearing 1, a main shaft 2, a first main shaft support 3-1, a second main shaft support 3-2, a motor 4, a dry gas seal 5, a comb seal 6, a compressor housing 7, a stationary blade 8, a through flow channel outlet 9, a moving blade 10, a semi-open through flow channel 11, a non-through flow channel 12, a compressor runner 13, a dry gas storage tank 14, a dry gas seal pipeline 15 and a central symmetrical local air intake semi-open impeller compressor 16, wherein the thrust bearing 1, the first main shaft support 3-1, the motor 4, the second main shaft support 3-2 and the central symmetrical local air intake semi-open impeller compressor 16 are sequentially arranged on the main shaft 2 from one end of the main shaft 2; the centrosymmetric partial air inlet semi-open type impeller compressor 16 comprises a dry air seal 5, a comb seal 6, a compressor shell 7, a static blade 8, a moving blade 10 and a compressor runner 13, wherein the moving blade 10 is installed on the compressor runner 13, the moving blade 10 and the compressor runner 13 form a compressor impeller, a processing surface on one side of the moving blade 10 or a side processing surface of the compressor runner 13, a bottom processing surface of the compressor runner 13 and a processing surface on one side of another adjacent moving blade 10 or a side processing surface of the compressor runner 13 form an expanding type U-shaped semi-open type through flow channel 11, an unprocessed part on the compressor runner 13 is a non-through flow channel 12, a through flow channel outlet 9 is arranged at the tail end of the semi-open type through flow channel 11, and the static blade 8 is installed on the compressor shell 7 on the outer side of the through flow channel outlet 9 in the; the dry gas storage tank 14 is connected with the dry gas seal 5 through a dry gas seal pipeline 15, the dry gas seal 5, the comb tooth seal 6 and an impeller with moving blades 10 of a central symmetrical partial-intake semi-open type impeller compressor 16 are sequentially positioned on the main shaft 2, and the dry gas seal 5 is close to the second main shaft support 3-2.
As a preferred embodiment of the present invention, the number of the semi-open through-flow channels 11 of the centrosymmetric partial-intake semi-open impeller compressor 16 is an even number greater than or equal to 2, and the two semi-open through-flow channels 11 with opposite positions are in a space central symmetric structure with the central axis of the main shaft as the central axis.
As a preferred embodiment of the present invention, the air intake mode of the centrosymmetric partial air intake semi-open type impeller compressor 16 is axial air intake and radial air outlet.
As a preferred embodiment of the present invention, the motor 4 has 2 or more pole pairs and can operate at 1 or more rotational speeds.
As the preferred embodiment of the present invention, the centrosymmetric partial air intake semi-open type impeller compressor 16 adopts one or more sections of comb seals 6 to control the internal leakage, and at least one section of comb seal 6 is disposed on the main shaft 2, and the rest of comb seals 6 are selectively disposed at any gap between the compressor impeller of the centrosymmetric partial air intake semi-open type impeller compressor 16 and the compressor housing 7.
The utility model discloses a working method of a semi-open centrifugal compressor for a micro volume flow supercritical working medium, which mainly comprises three processes, namely a preparation stage, an operation stage and a shutdown stage, wherein in the preparation stage, lubricating oil is supplied to a first main shaft support 3-1 and a second main shaft support 3-2 by an oil supply system, and dry gas is sealed by a dry gas storage tank 14 through a dry gas sealing pipeline 15 to form a high-pressure pure gas; after the operation is ready, the operation stage is started, the motor 4 is started and rapidly rises to the designed rotating speed, the supercritical working medium flowing in along the axial inlet of the compressor shell 7 is sucked into the inlet of the semi-open through-flow channel 11 of the compressor impeller, is subjected to speed-rising diffusion along the expanding type semi-open through-flow channel 11 to the through-flow channel outlet 9, then enters the stationary blade 8 channel on the compressor shell 7 for speed reduction and pressure rise, and then flows out of the centrosymmetric partial air inlet semi-open impeller compressor 16 from the radial outlet of the compressor shell 7; in the shutdown stage, the motor 4 stops providing power, the centrosymmetric partial-air-intake semi-open type impeller compressor 16 stops rapidly, after the centrosymmetric partial-air-intake semi-open type impeller compressor 16 stops, the dry gas storage tank 14 stops supplying high-pressure pure gas to the dry gas seal 5, and the oil supply system stops working after the first main shaft support 3-1 and the second main shaft support 3-2 are supplied with lubricating oil for post-lubrication for 20 minutes.
Claims (4)
1. Little volume flow supercritical working medium semi-open centrifugal compression device, its characterized in that: the device comprises a thrust bearing (1), a main shaft (2), a first main shaft support (3-1), a second main shaft support (3-2), a motor (4), a dry gas seal (5), a comb seal (6), a compressor shell (7), a static blade (8), a through flow channel outlet (9), a moving blade (10), a semi-open type through flow channel (11), a non-through flow channel (12), a compressor runner (13), a dry gas storage tank (14), a dry gas seal pipeline (15) and a centrosymmetric local air inlet semi-open type impeller compressor (16), wherein the thrust bearing (1), the first main shaft support (3-1), the motor (4), the second main shaft support (3-2) and the centrosymmetric local air inlet semi-open type impeller compressor (16) are sequentially arranged on the main shaft (2) from one end of the main shaft (2); the centrosymmetric partial air inlet semi-open type impeller compressor (16) consists of a dry air seal (5), a comb tooth seal (6), a compressor shell (7), a static blade (8), a moving blade (10) and a compressor runner (13), wherein the moving blade (10) is installed on the compressor runner (13), the moving blade (10) and the compressor runner (13) form a compressor impeller, a processing surface on one side of the moving blade (10) or a side processing surface of the compressor runner (13), a bottom processing surface of the compressor runner (13) and a processing surface on one side of another adjacent moving blade (10) or a side processing surface of the compressor runner (13) form an expanding type U-shaped semi-open type through-flow channel (11), an unprocessed part on the compressor runner (13) is a non-through-flow channel (12), and the tail end of the semi-open type through-flow channel (11) is a through-flow channel outlet (9), the stationary blades (8) are mounted on the compressor shell (7) on the outer side of the whole circumferential radial direction of the through-flow channel outlet (9); the dry gas storage tank (14) is connected with the dry gas seal (5) through a dry gas seal pipeline (15), the dry gas seal (5), the comb seal (6) and an impeller where a moving blade (10) of the semi-open impeller compressor (16) with the central symmetry and local gas inlet are located are sequentially located on the main shaft (2), and the dry gas seal (5) is close to the second main shaft support (3-2).
2. The semi-open type centrifugal compressor for micro-volume flow supercritical working medium according to claim 1, wherein: the semi-open type through-flow channels (11) of the centrosymmetric local air inlet semi-open type impeller compressor (16) are even numbers which are more than or equal to 2, and the two semi-open type through-flow channels (11) which are opposite in position are in a space centrosymmetric structure with the central line of the main shaft as the central line.
3. The semi-open type centrifugal compressor for micro-volume flow supercritical working medium according to claim 1, wherein: the motor (4) has 2 or more pole pairs and can work at 1 or more rotation speeds.
4. The semi-open type centrifugal compressor for micro-volume flow supercritical working medium according to claim 1, wherein: the centrosymmetric local air intake semi-open type impeller compressor (16) adopts a leakage control mode in one section or multiple sections of comb tooth seals (6), at least one section of comb tooth seal (6) is arranged on the main shaft (2), and the rest comb tooth seals (6) are selectively arranged at any gap between a compressor impeller and a compressor shell (7) of the centrosymmetric local air intake semi-open type impeller compressor (16).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920529481.3U CN209838711U (en) | 2019-04-18 | 2019-04-18 | Semi-open centrifugal compressor for micro volume flow supercritical working medium |
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| CN201920529481.3U CN209838711U (en) | 2019-04-18 | 2019-04-18 | Semi-open centrifugal compressor for micro volume flow supercritical working medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110173443A (en) * | 2019-04-18 | 2019-08-27 | 西安热工研究院有限公司 | The overcritical working medium semi-open type centrifugal compressed device and method of micro volume flow |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110173443A (en) * | 2019-04-18 | 2019-08-27 | 西安热工研究院有限公司 | The overcritical working medium semi-open type centrifugal compressed device and method of micro volume flow |
| CN110173443B (en) * | 2019-04-18 | 2024-05-28 | 西安热工研究院有限公司 | Semi-open centrifugal compression device and method for supercritical working medium with micro volume flow |
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