CN210686176U - Bearing sealing device of vertical water turbine generator set - Google Patents
Bearing sealing device of vertical water turbine generator set Download PDFInfo
- Publication number
- CN210686176U CN210686176U CN201921494556.5U CN201921494556U CN210686176U CN 210686176 U CN210686176 U CN 210686176U CN 201921494556 U CN201921494556 U CN 201921494556U CN 210686176 U CN210686176 U CN 210686176U
- Authority
- CN
- China
- Prior art keywords
- bearing
- drainage
- bearing cover
- sealing
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The utility model discloses a bearing sealing device of a vertical water turbine generator set, which comprises a main shaft and a bearing cover correspondingly matched with the rotating part of the main shaft; the bearing cover comprises an upper guide thrust bearing cover and a lower guide bearing cover; the bearing cover comprises a connecting part and a sealing part, three sealing rings are arranged on the inner side of the sealing part, two mutually isolated annular cavities are formed between the three sealing rings, and the annular cavities are respectively an air seal annular cavity and a drainage annular cavity; and a groove is arranged on the matching surface of the sealing ring and the main shaft, and a sealing copper plate is arranged in the groove and is matched and sealed with the main shaft. The utility model discloses a bearing seal device is through setting up atmoseal annular chamber and drainage annular chamber on the bearing cap, forms the flexible sealed pair of high-pressure draught after atmoseal annular chamber and the high-pressure gas generator intercommunication, and the oil mist that the drainage annular chamber will leak is drawn forth and is cooled off the recovery.
Description
Technical Field
The utility model relates to a hydroelectric power generation equipment technical field, concretely relates to vertical hydroelectric set bearing sealing device.
Background
The vertical water turbine generator set is a common type of hydroelectric power station and is widely applied in the world hydropower industry. The general vertical generator set is provided with two radial bearings and a thrust bearing, wherein the radial bearings bear radial loads, the thrust bearing bears axial loads, the bearings play an important role in the operation of the generator set, whether the bearings operate normally is related to whether the generator set can generate electricity normally, the safety of the generator set is influenced, the overhaul period and the service life of the generator set are influenced, and the normal maintenance workload of a hydropower station is seriously influenced.
When the unit operates, a large amount of oil mist is easily generated by hot oil of bearing lubricating oil after heat exchange of the radial bearing bush and the thrust bearing bush, the oil mist overflows through a gap between the bearing cover and the main shaft, particularly, when the high-speed unit operates, the bearing generates a large amount of oil mist, the overflowed oil mist not only pollutes a collecting ring, but also pollutes stator and rotor coils of a generator, the insulation grade is reduced, meanwhile, the insulation aging is accelerated, the hidden danger is brought to the safe operation of the unit, and meanwhile, the service life of the unit is also shortened. In order to reduce or seal oil mist as much as possible, the bearing cover in China generally adopts some methods and measures structurally, in order to reduce the clearance between the bearing cover and the main shaft, most of the bearing cover adopts a fit type sealing structure, the clearance between the bearing cover and the main shaft of the sealing structure is zero, the sealing effect is good at the initial stage of use, but the use effect becomes worse after several months or more than one year along with the extension of the use time, a large amount of oil mist overflows, the bearing cover has the advantages of good economy, and the bearing cover needs to be replaced after being used for a period of time; the other part is to install an oil mist suction and discharge device, which has the advantages of easy installation and power consumption and also has the defect that the oil filter needs to be stopped and replaced after a period of use.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a vertical hydroelectric set bearing sealing device.
In order to achieve the above object, an embodiment of the present invention provides a bearing sealing device for a vertical water turbine generator set, which includes a main shaft and a bearing cover correspondingly engaged with a rotation portion of the main shaft; the bearing cover comprises an upper guide thrust bearing cover and a lower guide bearing cover;
the bearing cover comprises a connecting part and a sealing part, three sealing rings are arranged on the inner side of the sealing part, two mutually isolated annular cavities are formed between the three sealing rings, and the annular cavities are respectively an air seal annular cavity and a drainage annular cavity; a groove is arranged on the matching surface of the sealing ring and the main shaft, and a sealing copper plate is arranged in the groove and is matched and sealed with the main shaft;
the opening of the air seal annular cavity is communicated with an air seal pipe;
the opening of the drainage annular cavity is communicated with a bearing cover drainage tube;
a bearing box drainage tube is communicated with a bearing box assembled on the generator set;
the gas seal pipe is communicated with the high-pressure gas generator through a gas seal extension pipe;
the bearing cover drainage tube and the bearing box drainage tube are communicated with the condenser through the drainage extension tube;
one-way valves are arranged on the air seal extension pipe and the drainage extension pipe;
the bearing cover is formed by splicing a plurality of arc-shaped blocks, and all the arc-shaped blocks are spliced to form a circular bearing cover; each arc-shaped block comprises an arc-shaped main part, a flange plate and a chassis; the inner side of the arc main part is provided with a sealing ring, and the flange plate and the chassis are provided with screw holes; the flange plate and the bolt are matched to splice two adjacent arc-shaped blocks into a whole, and the chassis is spliced to form a connecting part.
Preferably, the connecting portion is provided with a bolt hole, and is fixed by a bolt.
Preferably, the mating end of the sealing copper plate and the main shaft is a round angle.
Preferably, the bearing cover drainage tube and the bearing box drainage tube are respectively connected with a drainage extension tube, and the two drainage extension tubes are respectively connected with the condenser.
Preferably, the lower end of the main shaft is provided with two lower guide bearing caps, and each lower guide bearing cap is connected with an air seal pipe and a bearing cap drainage pipe respectively.
The utility model discloses a bearing sealing device of a vertical water turbine generator set, which comprises a main shaft and a bearing cover correspondingly matched with the rotating part of the main shaft; the bearing cover comprises an upper guide thrust bearing cover and two lower guide bearing covers;
the bearing cover comprises a connecting part and a sealing part, three sealing rings are arranged on the inner side of the sealing part, two mutually isolated annular cavities are formed between the three sealing rings, and the annular cavities are respectively an air seal annular cavity and a drainage annular cavity; a groove is arranged on the matching surface of the sealing ring and the main shaft, and a sealing copper plate is arranged in the groove and is matched and sealed with the main shaft;
the opening of the air seal annular cavity is communicated with an air seal pipe; the opening of the drainage annular cavity is communicated with a bearing cover drainage tube; a bearing box drainage tube is communicated with a bearing box assembled on the generator set;
the air seal pipe on the upper guide thrust bearing cover is connected with the high-pressure gas generator through an air seal extension pipe; the two gas seal extension pipes on the lower guide bearing cover are connected with a high-pressure gas generator through one gas seal extension pipe;
a bearing cap drainage tube arranged on the upper guide thrust bearing cap is communicated with the condenser through a drainage extension tube; two bearing cover drainage tubes on the lower guide bearing cover are communicated with the condenser through a drainage extension tube; the bearing box drainage tube is communicated with the condenser through a drainage extension tube;
one-way valves are arranged on the air seal extension pipe and the drainage extension pipe;
the bearing cover is formed by splicing a plurality of arc-shaped blocks, and all the arc-shaped blocks are spliced to form a circular bearing cover; each arc-shaped block comprises an arc-shaped main part, a flange plate and a chassis; the inner side of the arc main part is provided with a sealing ring, and the flange plate and the chassis are provided with screw holes; the flange plate and the bolt are matched to splice two adjacent arc-shaped blocks into a whole, and the chassis is spliced to form a connecting part.
To sum up, the utility model has the advantages of it is following:
the utility model discloses a bearing seal device is through setting up atmoseal annular chamber and drainage annular chamber on the bearing cap, forms the flexible sealed pair of high-pressure draught after atmoseal annular chamber and the high-pressure gas generator intercommunication, and the oil mist that the drainage annular chamber will leak is drawn forth and is cooled off the recovery.
The bearing sealing device can greatly reduce the free diffusion of lubricating oil mist and reduce the influence of oil mist overflow on equipment such as collecting rings and the like. The utility model can solve the problem that the collector ring is polluted by the oil mist overflowing after the existing unit is operated, especially after the middle-high speed generator set is operated, and avoids the problem that the service life of the slip ring is influenced by the contact between the slip ring and the carbon brush for ignition; the problem that oil mist of a lower guide bearing cover is condensed at a mechanical braking ring and an air brake after overflowing, so that the braking effect of a unit is influenced, and the downtime is prolonged is solved; the problem of oil mist excessive back, cause the pollution of generator rotor magnetic pole, yoke and stator bar, oil mist and dust pile up in stator core ventilation ditch and rotor magnetic pole ventilation ditch department, cause the generator ventilation cooling variation, seriously influence generator radiating effect is solved.
Drawings
Fig. 1 is a schematic view of a bearing seal assembly according to an embodiment of the present invention after installation;
fig. 2 is a schematic view of a bearing seal arrangement according to an embodiment of the present invention;
FIG. 3 is a schematic view of a bearing cap according to an embodiment of the present invention;
fig. 4 is a schematic view of 1/4 bearing caps according to an embodiment of the present invention.
Wherein, 1, a main shaft; 2. an upper guide thrust bearing cover; 3. a lower guide bearing cap; 4. a connecting portion; 5. a sealing part; 6. a seal ring; 7. an air seal annular cavity; 8. a drainage annular cavity; 9. sealing the copper plate; 10. a gas seal pipe; 11. a bearing cap drainage tube; 12. a bearing box drainage tube; 13. a condenser; 14. an air-seal extension tube; 15. a drainage extension tube; 16. an arc-shaped main part; 17. a flange plate; 18. a chassis.
Detailed Description
The utility model provides a bearing sealing device of a vertical water turbine generator set, which comprises a main shaft 1 and a bearing cover rotationally connected with the main shaft 1; the bearing cover comprises an upper guide thrust bearing cover 2 and a lower guide bearing cover 3. The utility model discloses a main shaft 1 is among the hydroelectric set essential element, and main shaft 1 need rotate, and has certain length, consequently installs with 1 cooperation positions of main shaft and leads thrust bearing cap 2 and lead bearing cap 3 down.
The bearing cover comprises a connecting part 4 and a sealing part 5, and the connecting part 4 is arranged on the frame; the connecting part 4 is provided with a bolt hole and is fixed through a bolt; the fixation may also be performed in other ways. The seal portion 5 is a portion where the bearing cap is directly fitted to the main shaft 1 to seal.
Three sealing rings 6 are arranged on the inner side of the sealing part 5, two mutually isolated annular cavities are formed among the three sealing rings 6, and the annular cavities are respectively an air seal annular cavity 7 and a drainage annular cavity 8; and a groove is formed in the matching surface of the sealing ring 6 and the main shaft 1, and a sealing copper plate 9 is arranged in the groove and is matched and sealed with the main shaft 1. The sealing copper plate 9 has moderate rigidity and elasticity and is matched and sealed with the outer wall of the main shaft 1. The matching end of the sealing copper plate 9 and the main shaft 1 is a round angle.
The opening of the air-sealed annular cavity 7 is communicated with an air-sealed pipe 10 which can be a metal pipe and is embedded into the opening to be communicated with the air-sealed annular cavity 7. A bearing cover drainage tube is communicated with the opening of the drainage annular cavity 8; and a bearing box drainage tube is communicated with a bearing box assembled by the generator set.
The air seal pipe of the utility model is communicated with the high-pressure gas generator through the air seal extension pipe; the bearing cover drainage tube and the bearing box drainage tube are communicated with the condenser through the drainage extension tube; one-way valves are arranged on the air seal extension pipe and the drainage extension pipe. The air seal extension tube and the drainage extension tube can also be flexible tubes, preferably insulating tubes.
The utility model discloses a theory of operation:
after the high-pressure gas generator is switched on, high-pressure gas enters the gas seal annular cavity 7 through the gas seal extension pipe 14 and the gas seal pipe, so that higher pressure is formed in the gas seal annular cavity 7, oil mist with low pressure and low speed cannot overflow from the gap and is retained on a lubricating surface, and the loss of lubricating oil is reduced. In addition, the oil mist generated in the annular drainage cavity 8 can enter the condenser 13 through the bearing cover drainage tube and the extended drainage tube 15, and the condenser can condense and recover the overflowed oil mist. Similarly, the oil mist generated in the bearing box can also enter the condenser through the bearing box drainage tube and the drainage extension tube for recycling.
The utility model discloses in the optimization embodiment, bearing cap drainage tube 11 and bearing box drainage tube 12 are connected with a drainage extension pipe respectively, and two drainage extension pipes are connected with the condenser respectively.
The utility model discloses in the preferred embodiment, the main shaft lower extreme is equipped with two and leads bearing cap 3 down, and every leads bearing cap 3 down and is connected with atmoseal pipe and bearing cap drainage tube respectively.
The utility model discloses a bearing sealing device of a vertical water turbine generator set, which comprises a main shaft 1 and a bearing cover rotationally connected with the main shaft 1; the bearing cover comprises an upper guide thrust bearing cover 2 and two lower guide bearing covers 3;
the bearing cover comprises a connecting part 4 and a sealing part 5, three sealing rings 6 are arranged on the inner side of the sealing part 5, two mutually isolated annular cavities are formed between the three sealing rings 6, and the annular cavities are respectively an air seal annular cavity 7 and a drainage annular cavity 8; and a groove is formed in the matching surface of the sealing ring 6 and the main shaft 1, and a sealing copper plate 9 is arranged in the groove and is matched and sealed with the main shaft 1.
An air seal pipe is communicated with the opening of the air seal annular cavity 7; a bearing cover drainage tube is communicated with the opening of the drainage annular cavity 8; a bearing box drainage tube is communicated with a bearing box assembled on the generator set; the air seal pipe on the upper guide thrust bearing cover 2 is connected with a high-pressure gas generator through an air seal extension pipe; the two gas seal extension pipes on the lower guide bearing cover 3 are combined and then connected with a high-pressure gas generator through one gas seal extension pipe.
A bearing cap drainage tube arranged on the upper guide thrust bearing cap 2 is communicated with the condenser through a drainage extension tube; two bearing cover drainage tubes on the lower guide bearing cover 3 are combined and then communicated with the condenser through a drainage extension tube; the bearing box drainage tube is communicated with the condenser through a drainage extension tube; one-way valves are arranged on the air seal extension pipe and the drainage extension pipe.
A large amount of oil mist is produced in the oil grooves of the upper guide thrust bearing and the lower guide bearing of the vertical water turbine generator set due to various reasons, and the oil mist can be sealed through the device. The high-pressure gas generator leads high-pressure high-speed gas into the bearing cover through a pipeline, a gas seal annular cavity 7 of the bearing cover is filled with the high-pressure high-speed gas, a flexible sealing pair is formed between the bearing cover and the rotating main shaft 1, the introduced high-pressure high-speed gas seals low-pressure low-speed oil mist which is expected to overflow, and a drainage annular cavity 8 is arranged to drain the oil mist in the bearing oil groove to a condenser through a drainage extension pipe and other pipelines for ensuring the reliable work of the sealing pair.
Because the rotating speed, the capacity, the geometric dimension, the manufacturing quality, the bearing cap gap and the installation quality of each power station unit are different, the swing degree of the unit after operation is different, and in order to ensure that the oil mist can be completely sealed by the product, a sealing copper plate 9 is additionally arranged at the gap between the bearing cap and the rotating main shaft 1, the gap between the bearing cap and the main shaft 1 can be effectively reduced, the high-pressure high-speed gas in the annular cavity can not be decompressed or is decompressed less, and the problem of interference which can occur after the gap between the bearing cap and the main shaft 1 is small can be solved.
The utility model discloses a bearing cap structure, wherein the bearing cap is formed by splicing a plurality of arc-shaped blocks, and all the arc-shaped blocks are spliced to form a circular bearing cap; each arc block comprises an arc main part 16, a flange plate 17 and a chassis 18; the inner side of the arc main part is provided with a sealing ring, and the flange plate and the chassis are provided with screw holes; the flange plate and the bolt are matched to splice two adjacent arc-shaped blocks into a whole, and the chassis is spliced to form a connecting part.
The size of bearing cap designs according to the capacity isoparametric of unit, and the bearing cap is bigger, can select more arc pieces to assemble. The both ends of arc piece set up the retaining member such as flange plate can cooperate bolt nut and assemble two adjacent arc pieces, and the sealing ring of all arc main parts is the partly of bearing cap sealing ring in fact, assembles and accomplishes the back sealing ring and also assembled as an organic whole.
While the present invention has been described in detail and with reference to the accompanying drawings, it is not to be considered as limited to the scope of the invention. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.
Claims (6)
1. The utility model provides a vertical hydroelectric set bearing sealing device which characterized in that: comprises a main shaft and a bearing cover correspondingly matched with the rotating part of the main shaft; the bearing cover comprises an upper guide thrust bearing cover and a lower guide bearing cover;
the bearing cover comprises a connecting part and a sealing part, three sealing rings are arranged on the inner side of the sealing part, two mutually isolated annular cavities are formed between the three sealing rings, and the annular cavities are respectively an air seal annular cavity and a drainage annular cavity; a groove is formed in the matching surface of the sealing ring and the main shaft, and a sealing copper plate is arranged in the groove and is matched and sealed with the main shaft;
the opening of the air seal annular cavity is communicated with an air seal pipe;
the opening of the drainage annular cavity is communicated with a bearing cover drainage tube;
a bearing box drainage tube is communicated with a bearing box assembled on the generator set;
the gas seal pipe is communicated with the high-pressure gas generator through a gas seal extension pipe;
the bearing cover drainage tube and the bearing box drainage tube are communicated with the condenser through the drainage extension tube;
the air seal extension pipe and the drainage extension pipe are provided with one-way valves;
the bearing cover is formed by splicing a plurality of arc-shaped blocks, and all the arc-shaped blocks are spliced to form a circular bearing cover; each arc-shaped block comprises an arc-shaped main part, a flange plate and a chassis; the inner side of the arc main part is provided with a sealing ring, and the flange plate and the chassis are provided with screw holes; the flange plate and the bolt are matched to splice two adjacent arc-shaped blocks into a whole, and the chassis is spliced to form a connecting part.
2. The vertical hydro-turbo generator set bearing sealing device according to claim 1, wherein: the connecting part is provided with a bolt hole and is fixed through a bolt.
3. The vertical hydro-turbo generator set bearing sealing device according to claim 1, wherein: the matching end of the sealing copper plate and the main shaft is a round angle.
4. The vertical hydro-turbo generator set bearing sealing device according to claim 1, wherein: the bearing cover drainage tube and the bearing box drainage tube are respectively connected with a drainage extension tube, and the two drainage extension tubes are respectively connected with the condenser.
5. The vertical hydro-turbo generator set bearing sealing device according to claim 1, wherein: the lower end of the main shaft is provided with two lower guide bearing caps, and each lower guide bearing cap is connected with an air seal pipe and a bearing cap drainage pipe respectively.
6. The utility model provides a vertical hydroelectric set bearing sealing device which characterized in that: comprises a main shaft and a bearing cover correspondingly matched with the rotating part of the main shaft; the bearing cover comprises an upper guide thrust bearing cover and two lower guide bearing covers;
the bearing cover comprises a connecting part and a sealing part, three sealing rings are arranged on the inner side of the sealing part, two mutually isolated annular cavities are formed between the three sealing rings, and the annular cavities are respectively an air seal annular cavity and a drainage annular cavity; a groove is formed in the matching surface of the sealing ring and the main shaft, and a sealing copper plate is arranged in the groove and is matched and sealed with the main shaft;
the opening of the air seal annular cavity is communicated with an air seal pipe; the opening of the drainage annular cavity is communicated with a bearing cover drainage tube; a bearing box drainage tube is communicated with a bearing box assembled on the generator set;
the air seal pipe on the upper guide thrust bearing cover is connected with the high-pressure gas generator through an air seal extension pipe; the two gas seal extension pipes on the lower guide bearing cover are connected with a high-pressure gas generator through one gas seal extension pipe;
a bearing cap drainage tube arranged on the upper guide thrust bearing cap is communicated with the condenser through a drainage extension tube; two bearing cover drainage tubes on the lower guide bearing cover are communicated with the condenser through a drainage extension tube; the bearing box drainage tube is communicated with the condenser through a drainage extension tube;
the air seal extension pipe and the drainage extension pipe are provided with one-way valves;
the bearing cover is formed by splicing a plurality of arc-shaped blocks, and all the arc-shaped blocks are spliced to form a circular bearing cover; each arc-shaped block comprises an arc-shaped main part, a flange plate and a chassis; the inner side of the arc main part is provided with a sealing ring, and the flange plate and the chassis are provided with screw holes; the flange plate and the bolt are matched to splice two adjacent arc-shaped blocks into a whole, and the chassis is spliced to form a connecting part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921494556.5U CN210686176U (en) | 2019-09-10 | 2019-09-10 | Bearing sealing device of vertical water turbine generator set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921494556.5U CN210686176U (en) | 2019-09-10 | 2019-09-10 | Bearing sealing device of vertical water turbine generator set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210686176U true CN210686176U (en) | 2020-06-05 |
Family
ID=70891254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921494556.5U Active CN210686176U (en) | 2019-09-10 | 2019-09-10 | Bearing sealing device of vertical water turbine generator set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210686176U (en) |
-
2019
- 2019-09-10 CN CN201921494556.5U patent/CN210686176U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110630743B (en) | Main shaft sealing device for wind turbine generator | |
| CN203352353U (en) | Bearing structure of double-fed wind-driven generator | |
| CN102185413A (en) | Bearing structure of 2-megawatt wind driven generator | |
| CN210686176U (en) | Bearing sealing device of vertical water turbine generator set | |
| CN204647324U (en) | A kind of guide flowing type labyrinth gland | |
| CN112360953A (en) | Method for quickly treating oil leakage of output shaft oil seal of vertical reduction gearbox | |
| CN201330846Y (en) | Sealing device of motor bearing pedestal | |
| CN108019243A (en) | A kind of integral bearing A seating turbine | |
| CN216895766U (en) | High-speed shaft sealing ring for gearbox of wind turbine generator | |
| CN102969822B (en) | Bearing-replaceable motor structure and replacement method of motor bearings | |
| CN101634098B (en) | Compound sealing structure with backup function for rotary main shaft of industrial washing machine | |
| CN201258403Y (en) | Composite sealing structure with backup function of industrial washing machine rotary spindle | |
| CN208698486U (en) | Simple assembly chassis wheel group | |
| CN112228539A (en) | Method for quickly treating oil leakage of oil seal of output shaft of horizontal gear box | |
| CN210859808U (en) | Main shaft sealing device for wind turbine generator | |
| CN205148215U (en) | Frock is dismantled to non - drive end bearing of double bracing pump | |
| CN210509971U (en) | Small hole throttling air bearing for turbine direct-connected high-speed motor | |
| CN201679868U (en) | Sealing structure of main bearing of wind turbine | |
| CN102097884A (en) | Bearing buffer unit for motor | |
| CN202410804U (en) | Dustproof sealing structure for bearings of breakers | |
| CN204794489U (en) | Supplementary fan of reforming transform of high -power locomotive | |
| CN204597693U (en) | Motor bearings anti-oil leakage device | |
| CN216478926U (en) | Sealing structure of horizontal two-stage material-pushing centrifugal machine material-pushing shaft for nitrocotton production | |
| CN204647325U (en) | A kind of guide flowing type seal arrangement be installed in multidiameter shaft | |
| CN112628091A (en) | Magnetic suspension wind driven generator with through outer rotor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |