CN210483824U - Oil-gas combined bearing structure for turboexpander - Google Patents
Oil-gas combined bearing structure for turboexpander Download PDFInfo
- Publication number
- CN210483824U CN210483824U CN201921305070.2U CN201921305070U CN210483824U CN 210483824 U CN210483824 U CN 210483824U CN 201921305070 U CN201921305070 U CN 201921305070U CN 210483824 U CN210483824 U CN 210483824U
- Authority
- CN
- China
- Prior art keywords
- bearing
- oil
- gas
- labyrinth
- main shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses an oil gas combination bearing structure for turbo expander, include: the main shaft of the expansion machine is also sleeved with an air bearing and a labyrinth separation sleeve, the air bearing is positioned between the labyrinth seal sleeve and the oil bearing, the air bearing is used for supporting the end part of the main shaft close to the impeller of the expansion machine, and the labyrinth separation sleeve is positioned between the air bearing and the oil bearing. The oil-gas combined bearing structure replaces the oil bearing close to the impeller with the gas bearing, so that the expander is prevented from being frozen at low temperature, the expander runs more reliably and stably, the expansion machine braking end far away from the impeller adopts the oil bearing, the expander runs reliably, and the use cost is greatly reduced.
Description
Technical Field
The utility model relates to a turbo expander field, concretely relates to oil gas combination bearing structure for turbo expander.
Background
The turboexpander is one of the key devices in the cryogenic gas liquefaction system. The main principle of the turboexpander is that working medium gas with certain pressure is adiabatically expanded in the turboexpander to push an impeller on one end of a main shaft to rotate and apply work outwards to consume internal energy of the gas, so that the gas is cooled strongly to achieve the purpose of refrigeration, and energy applied to the work outwards by the working medium gas is consumed by a brake on the other end of the main shaft. The turboexpander mainly has the working characteristics of high rotating speed, low temperature, large pressure difference and the like, and the bearing structure for supporting the main shaft to operate in the bearing chamber of the turboexpander directly influences the operating efficiency and the service life of the turboexpander. At present, the domestic turbo expander mainly adopts a single oil bearing or a single air bearing to support a main shaft of the turbo expander. The oil bearing is a sliding bearing adopting oil as a lubricant, and the gas bearing is a sliding bearing adopting gas as a lubricant; the oil bearing is mature in technology, moderate in price and high in bearing capacity, but the oil bearing close to the impeller of the expansion machine is easy to freeze at low temperature, so that a tile burning accident is easy to cause, and the running reliability and stability of the turboexpander are reduced. The air bearing has the advantages of low friction loss, light weight, high rotating speed, wide applicable temperature range and the like, but the air bearing has high processing precision requirement and small bearing capacity, and the air bearing needs to continuously consume power in order to maintain the operation of the expander; the polytetrafluoroethylene material that the gas bearing surface adopted easily causes wearing and tearing when opening and stop, influences life, needs the replacement spare part of regular inspection wearing and tearing, and use cost is higher.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the oil-gas mixing bearing structure for the turboexpander can ensure that the turboexpander can reliably and stably operate and can reduce the use cost of the turboexpander.
In order to solve the above problem, the utility model discloses the technical scheme who adopts does: an oil and gas combination bearing arrangement for a turboexpander comprising: lie in turbo-expander bearing chamber and respectively the suit in the labyrinth seal cover on turbo-expander main shaft, oil bearing, footstep bearing, oil bearing is used for supporting the main shaft, footstep bearing is used for preventing main shaft axial float, it has sealed gas to lead to in the labyrinth seal cover, oil bearing is located between labyrinth seal cover and the footstep bearing, labyrinth seal cover is located on the main shaft between expander impeller and the oil bearing, sealed gas in the labyrinth seal cover can seal the clearance between main shaft and the bearing chamber tip, its characterized in that: the oil bearing is used for supporting the end part of the main shaft close to the braking end of the turboexpander, the main shaft of the turboexpander in the bearing chamber is further sleeved with a gas bearing and a labyrinth separation sleeve, separation gas is communicated in the labyrinth separation sleeve, the gas bearing is positioned between the labyrinth seal sleeve and the oil bearing, the gas bearing is used for supporting the end part of the main shaft close to the impeller of the turboexpander, and the labyrinth separation sleeve is positioned between the gas bearing and the oil bearing, so that the gas bearing and the oil bearing can be separated by the separation gas in the labyrinth separation sleeve.
Further, the aforementioned oil-gas combination bearing structure for a turboexpander, wherein: the sealing gas in the labyrinth seal sleeve, the separating gas in the labyrinth separating sleeve and the lubricating gas in the gas bearing are the same gas and are provided by the same gas supply circulating system.
Further, the aforementioned oil-gas combination bearing structure for a turboexpander, wherein: the lubricating oil in the oil bearing and the thrust bearing is provided by the same oil circulating system.
Further, the aforementioned oil-gas combination bearing structure for a turboexpander, wherein: and the air bearing and the oil bearing are both provided with a temperature sensor and a pressure sensor.
Further, the aforementioned oil-gas combination bearing structure for a turboexpander, wherein: the labyrinth structures on the labyrinth type separating sleeve and the labyrinth type sealing sleeve are annular sealing teeth.
The utility model has the advantages that: the oil-gas mixing bearing structure of the utility model replaces the oil bearing close to the low-temperature impeller end of the expander with the gas bearing, thereby avoiding the risk that the oil bearing is frozen due to low temperature, making the operation of the expander more reliable and stable, and the expander braking end far away from the cold end of the impeller adopts the oil bearing, compared with the adoption of the gas bearing, the oil bearing can effectively reduce the occurrence rate of bearing clamping stagnation, shaft locking or seizure phenomenon, ensuring the reliable operation of the expander, and the oil bearing is not easy to damage, avoiding frequent replacement of the gas bearing, thereby greatly reducing the use cost; in addition, a labyrinth type separation sleeve is arranged between the air bearing and the oil bearing for separation, so that the mutual influence between the air path of the air bearing and the oil path of the oil bearing is reduced, the influence of the cold end of the impeller on the oil bearing is reduced, the generation and concentration of oil-gas mixture are greatly reduced, and the difficulty of subsequent oil-gas separation is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an oil-gas combination bearing structure for a turboexpander according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
As shown in fig. 1, the bearing structure of the oil and gas combination for a turbo expander includes: a labyrinth gland 2, an oil bearing 3 and a thrust bearing 4 which are positioned in a turbo expander bearing chamber 12 and respectively sleeved on a turbo expander main shaft 1, wherein the oil bearing 3 is used for supporting the main shaft 1, the thrust bearing 4 is used for preventing the main shaft 1 from axially jumping, sealing gas is introduced into the labyrinth gland 2, the oil bearing 3 is positioned between the labyrinth gland 2 and the thrust bearing 4, the labyrinth gland 2 is positioned between an expander impeller 11 and the oil bearing 3 on the main shaft 1, the sealing gas in the labyrinth gland 2 can seal a gap between the main shaft 1 and the end part of the bearing chamber 12, so that the cooling capacity of the impeller end and working medium gas can be prevented from leaking, thereby reducing the influence of the cold end of the impeller on the inside of the bearing chamber 12, the oil bearing 3 is used for supporting the end part of the main shaft close to the turbo expander braking end 5, the turbo expander main shaft 1 in the bearing chamber 12 is sleeved with a gas bearing 6 and a labyrinth separation sleeve 7, the labyrinth separation sleeve 7 is filled with separation gas, the gas bearing 6 is positioned between the labyrinth seal sleeve 2 and the oil bearing 3, the gas bearing 6 is used for supporting the end part of the main shaft 1 close to the turbine expander impeller 11, and the labyrinth separation sleeve 7 is positioned between the gas bearing 6 and the oil bearing 3, so that the gas bearing 6 and the oil bearing 3 can be separated by the separation gas in the labyrinth separation sleeve 7.
In the embodiment, the labyrinth seal sleeve 2 and the labyrinth separation sleeve 7 are both labyrinth seals, the labyrinth structure is a ring seal tooth, the tooth is a labyrinth tooth, the labyrinth seals are labyrinth type tortuous channels which are arranged in sequence and are arranged around the rotating shaft, a series of closure gaps and expansion cavities are formed between the channels, and the sealed medium generates throttling effect when passing through the gaps of the tortuous labyrinth to achieve the purpose of leakage resistance. The labyrinth seal is not limited by the rotating speed and the temperature, and the friction power consumption is extremely low.
In the present embodiment, the seal gas in the labyrinth seal sleeve 2, the separation gas in the labyrinth separation sleeve 7, and the lubrication gas in the gas bearing 6 are all the same gas as the working gas in the turboexpander, such as: hydrogen or helium and are all provided by the same gas supply circulation system 8. The lubricating oil in the oil bearing 3 and the thrust bearing 4 is supplied by the same oil circulation system 9. The air bearing 6 and the oil bearing 3 are both provided with a temperature sensor and a pressure sensor, so that the temperature and the pressure of the bearing can be detected, and corresponding electric signals can be generated and sent to a central control system after the temperature and the pressure are detected, so that the stable use of the bearing system can be maintained by controlling and braking the rotating speed of the expander.
The oil bearing close to the low-temperature impeller end of the expander is replaced by the air bearing, so that the risk that the oil bearing is frozen due to low temperature can be avoided, the operation of the expander is more reliable and stable, and the brake end of the expander far away from the cold end of the impeller adopts the oil bearing; the air-tight labyrinth seal sleeve is arranged between the air bearing and the impeller, so that the low temperature at the impeller end can be isolated better; the gas bearing, the labyrinth type separating sleeve and the labyrinth type sealing sleeve share the same gas supply circulating system, gases with the same expander working medium are used, and the gases come from part of the working medium gases separated from the liquefying device, so that the cost can be greatly saved; the separation gas can better separate the gas bearing gas circuit from the oil bearing oil circuit, so that the mutual influence is reduced, the influence of the cold end of the impeller on the oil bearing is reduced, the generation and concentration of an oil-gas mixture are greatly reduced, and the difficulty of subsequent oil-gas separation is reduced.
Claims (5)
1. An oil and gas combination bearing arrangement for a turboexpander comprising: lie in turbo-expander bearing chamber and respectively the suit in the labyrinth seal cover on turbo-expander main shaft, oil bearing, footstep bearing, oil bearing is used for supporting the main shaft, footstep bearing is used for preventing main shaft axial float, it has sealed gas to lead to in the labyrinth seal cover, oil bearing is located between labyrinth seal cover and the footstep bearing, labyrinth seal cover is located on the main shaft between expander impeller and the oil bearing, sealed gas in the labyrinth seal cover can seal the clearance between main shaft and the bearing chamber tip, its characterized in that: the oil bearing is used for supporting the end part of the main shaft close to the braking end of the turboexpander, the main shaft of the turboexpander in the bearing chamber is further sleeved with a gas bearing and a labyrinth separation sleeve, separation gas is communicated in the labyrinth separation sleeve, the gas bearing is positioned between the labyrinth seal sleeve and the oil bearing, the gas bearing is used for supporting the end part of the main shaft close to the impeller of the turboexpander, and the labyrinth separation sleeve is positioned between the gas bearing and the oil bearing, so that the gas bearing and the oil bearing can be separated by the separation gas in the labyrinth separation sleeve.
2. The oil and gas combination bearing structure for a turboexpander according to claim 1, wherein: the sealing gas in the labyrinth seal sleeve, the separating gas in the labyrinth separating sleeve and the lubricating gas in the gas bearing are the same gas and are provided by the same gas supply circulating system.
3. The oil and gas combination bearing structure for a turboexpander according to claim 1, wherein: the lubricating oil in the oil bearing and the thrust bearing is provided by the same oil circulating system.
4. The oil and gas combination bearing structure for a turboexpander according to claim 1, wherein: and the air bearing and the oil bearing are both provided with a temperature sensor and a pressure sensor.
5. The oil and gas combination bearing structure for a turboexpander according to claim 1, wherein: the labyrinth structures on the labyrinth type separating sleeve and the labyrinth type sealing sleeve are annular sealing teeth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921305070.2U CN210483824U (en) | 2019-08-13 | 2019-08-13 | Oil-gas combined bearing structure for turboexpander |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921305070.2U CN210483824U (en) | 2019-08-13 | 2019-08-13 | Oil-gas combined bearing structure for turboexpander |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210483824U true CN210483824U (en) | 2020-05-08 |
Family
ID=70537407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921305070.2U Active CN210483824U (en) | 2019-08-13 | 2019-08-13 | Oil-gas combined bearing structure for turboexpander |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210483824U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112392560A (en) * | 2019-08-13 | 2021-02-23 | 江苏国富氢能技术装备有限公司 | Oil-gas combined bearing structure for turboexpander |
| CN112833189A (en) * | 2020-12-30 | 2021-05-25 | 东方电气集团东方汽轮机有限公司 | Shaft end sealing structure of steam turbine water supply pump |
-
2019
- 2019-08-13 CN CN201921305070.2U patent/CN210483824U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112392560A (en) * | 2019-08-13 | 2021-02-23 | 江苏国富氢能技术装备有限公司 | Oil-gas combined bearing structure for turboexpander |
| CN112833189A (en) * | 2020-12-30 | 2021-05-25 | 东方电气集团东方汽轮机有限公司 | Shaft end sealing structure of steam turbine water supply pump |
| CN112833189B (en) * | 2020-12-30 | 2022-05-10 | 东方电气集团东方汽轮机有限公司 | Shaft end sealing structure of steam turbine water supply pump |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112392561B (en) | Magnetic-gas combined bearing structure for turbo expander | |
| CA2870742C (en) | Half-spoolie metal seal integral with tube | |
| CN210483824U (en) | Oil-gas combined bearing structure for turboexpander | |
| CN103557036A (en) | Integrated turbine set based on permanent magnetic and magnetic suspension technologies | |
| US9759083B2 (en) | Cryogenic liquid expansion turbine | |
| CN207538866U (en) | Two-stage cantilevered axis stream expanding machine | |
| US9217336B2 (en) | Gas turbine engine lubrication fluid barrier | |
| CN111828100A (en) | Serial dry gas sealing device for industrial steam turbine | |
| CN111425414A (en) | Special gas high-speed centrifugal compressor adopting gas suspension bearing | |
| CN111536242A (en) | Oil mist prevention and long-life dynamic seal for main shaft of large high-speed geotechnical centrifuge | |
| CN201246190Y (en) | Gas bearing supercharging turboexpander | |
| CN112392560A (en) | Oil-gas combined bearing structure for turboexpander | |
| CN203499731U (en) | High-temperature and high-speed floating ring air film sealing structure | |
| CN108019243A (en) | A kind of integral bearing A seating turbine | |
| CN111810253A (en) | Double-end-face dry air sealing device for industrial steam turbine | |
| CN101956571B (en) | Containerization type mechanical sealing structure of screw expansion power machine | |
| CN201723255U (en) | Assembled mechanical seal structure of screw rod expansion power machine | |
| CN209510316U (en) | Water-cooled development machine and its cutting arm | |
| CN204716308U (en) | A kind of turbine stub shaft bearing air system | |
| CN2208627Y (en) | Gas membrane float-ring oil sealing for air compressor | |
| CN208874395U (en) | Hydrogen cooled generator double fluid ring sealing bearing bush with wedged-shaped oil film film strips viscous flow groove | |
| CN102061946A (en) | Boosting turbo expander | |
| CN208871034U (en) | A kind of hydrogen cooled generator double fluid ring sealing bearing bush inhibiting Seal Oil channelling flow | |
| CN208474333U (en) | A kind of Bearning mechanism | |
| CN111810252A (en) | Split carbon ring type serial dry gas sealing device for industrial steam turbine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 215600 No. 236, Guotai North Road, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee after: Jiangsu Guofu hydrogen energy technology equipment Co.,Ltd. Address before: Jiangsu Guofu hydrogen technology equipment Co., Ltd., No.19, Fuxin (Chenxin) road, yangshe Town, Zhangjiagang City, Suzhou City, Jiangsu Province, 215600 Patentee before: Jiangsu Guofu Hydrogen Energy Technology Equipment Co.,Ltd. |
|
| CP03 | Change of name, title or address |