CN208518910U - A kind of vertical centrifugal pump configuring air hydrodynamic bearing - Google Patents
A kind of vertical centrifugal pump configuring air hydrodynamic bearing Download PDFInfo
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- CN208518910U CN208518910U CN201820840879.4U CN201820840879U CN208518910U CN 208518910 U CN208518910 U CN 208518910U CN 201820840879 U CN201820840879 U CN 201820840879U CN 208518910 U CN208518910 U CN 208518910U
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- Prior art keywords
- bearing
- thrust
- air hydrodynamic
- axle journal
- foil
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- 239000011888 foil Substances 0.000 claims description 79
- 210000004907 gland Anatomy 0.000 claims description 13
- 239000002826 coolant Substances 0.000 claims description 6
- 239000000110 cooling liquid Substances 0.000 claims description 4
- 229910000679 solder Inorganic materials 0.000 claims description 4
- 208000017740 grade III prostatic intraepithelial neoplasia Diseases 0.000 claims description 3
- 238000005461 lubrication Methods 0.000 abstract description 6
- 238000004140 cleaning Methods 0.000 abstract description 3
- 239000004519 grease Substances 0.000 abstract description 3
- 239000000314 lubricant Substances 0.000 abstract description 3
- 230000001050 lubricating effect Effects 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 6
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The utility model discloses a kind of vertical centrifugal pump for configuring air hydrodynamic bearing, including pump case, impeller, mechanical seal, axis and air hydrodynamic bearing；Wherein, air hydrodynamic bearing includes air hydrodynamic transverse bearing and two groups of air hydrodynamic thrust bearings.Air hydrodynamic bearing is instead of traditional oil lubrication or the bearing of grease lubrication, using air as lubricant medium, is not necessarily to lubricating system, structure is simple.The utility model also has many advantages, such as that revolving speed is high, precision is high, clean cleaning, low power consuming, low noise, long-term operation.
Description
Technical field
The utility model provides a kind of vertical centrifugal pump for configuring air hydrodynamic bearing, belongs to fluid machinery technical field.
Background technique
Vertical centrifugal pump is widely used in the nozzle pressurization of the industries such as petrochemical industry, coal chemical industry, sewage treatment, hot and cold water follows
The conveying of ring, flammable and combustible liquids and corrosive liquids.Compared with centrifugal pump of horizontal axis, the structure of vertical centrifugal pump is from bottom to top
Superposition connection, so occupied area is small, building investment is low.But in the application of existing vertical centrifugal pump, when high-speed cruising, thrust
The level height control range of bearing lubrication is narrow, and the too low then insufficient lubrication of oil level leads to bearing so that often there is lubrication failure
Abrasion, and the maintenance difficulty of vertical centrifugal pump is larger.
Utility model content
In view of the deficienciess of the prior art, the utility model provides a kind of vertical centrifugal for configuring air hydrodynamic bearing
Pump, the centrifugal pump configure air hydrodynamic bearing, use air for lubricant medium, without lubricating oil or lubricating grease system and gas supply system
System, structure are simple.
The technical solution adopted in the utility model is:
A kind of vertical centrifugal pump configuring air hydrodynamic bearing, including pump case, impeller, mechanical seal, axis and air hydrodynamic
Bearing；Wherein, air hydrodynamic bearing include air hydrodynamic transverse bearing and two groups of air hydrodynamic thrust bearings (upper thrust bearing and
Lower thrust bearing, two groups of air hydrodynamic thrust bearing structures are identical)；
The pump case includes the pump housing, pump cover, bearing housing and bearing gland, and pump cover is located in bearing housing, the pump housing and pump cover, pump
Body is bolted respectively with bearing housing, bearing housing and bearing gland；Pump housing side is equipped with pressure plug and exhaust valve, exhaust valve
Positioned at pump housing top side wall, pump housing bottom is equipped with bleeder valve；Bearing housing side wall is equipped with coolant inlet and cooling liquid outlet；
Axis includes four sections of axle journals, respectively axle journal I, axle journal II, axle journal III and axle journal IV, collectively constitutes complete axis, and four
The diameter of section axle journal are as follows: I < axle journal of axle journal, II < axle journal III, III > axle journal IV of axle journal；One end of axle journal I and impeller pass through screw thread
Connection, impeller are placed in the space that the pump housing and pump cover are formed；It is mechanical seal outside axle journal II, mechanical seal includes upper mechanical seal
With lower mechanical seal, the upper and lower ends of upper mechanical seal are connected through a screw thread fixation with bearing housing and pump cover respectively, and lower machinery is close
The upper end of envelope and pump cover are connected through a screw thread fixation；Air hydrodynamic transverse bearing is mounted at axle journal III, is stopped by bolt with lower
The connection of thrust bearing seat；Lower thrust bearing and upper thrust bearing are mounted on axle journal IV to be led to III junction of axle journal, lower thrust bearing
It crosses positioning pin I to be fixed on lower thrust shaft block, upper thrust bearing is fixed on thrust shaft block by positioning pin II, lower to stop
Thrust bearing seat is bolted on bearing housing, and upper thrust shaft block is bolted to bearing housing by bearing gland
On；Thrust button is equipped between lower thrust bearing and upper thrust bearing, thrust button is fixed on axis by thrust button positioning pin；Axle journal
IV one end is stretched out by bearing gland, is equipped with keyway above, for connecting with shaft coupling.
Preferably, the vertical centrifugal pump can be centrifugal pump of single stage type or centrifugal multistage pump multiple centrifugal pump.
Preferably, the air hydrodynamic transverse bearing is compliant foil air hydrodynamic transverse bearing, including transverse bearing top
Layer paillon, transverse bearing wave foil and bearing block, are followed successively by bearing block, transverse bearing wave foil and transverse bearing top layer foil from outside to inside
The concentric ring that piece is formed, bearing block is equipped with positioning pin III, for positioning and fixing.Preferably, compliant foil air hydrodynamic diameter
To bearing be 360 ° of compliant foils of complete cycle formula, three watts, four watts, in five watts six watts and eight watts of compliant foil air hydrodynamic transverse bearings
Any one.
Preferably, the air hydrodynamic thrust bearing is compliant foil air hydrodynamic thrust bearing, including bottom plate, thrust shaft
Wave foil and thrust bearing top foil are held, bottom plate is annular shape, and thrust bearing wave foil is uniformly arranged in the circumferential direction on bottom plate, thrust
Bearing top foil is uniformly distributed circumferentially on thrust bearing wave foil, has several solder joints to can be used for positioning and fixing on bottom plate,
When installation, thrust bearing top foil is towards thrust button.Preferably, compliant foil air hydrodynamic thrust bearing is with shaft diameter
Increase, thrust bearing top foil number can be three watts, four watts, five watts, six watts, seven watts or eight watts.
The course of work: before use, intracorporal gas discharge will be pumped by exhaust valve, coolant liquid is connected；In use, by axle journal
The keyway being arranged on IV is fixed by key and shaft coupling, shaft coupling again with motor axis connection, by motor driving shaft high speed rotation,
Axis impeller high speed rotation generates centrifugal force.Substance to be centrifuged is inhaled by suction inlet (opening on the right side of the pump housing as shown in figure 1)
Enter, by centrifuge separation, is discharged from outlet (opening on the left of the pump housing as shown in figure 1).Since axis rotation can generate certain axial direction
Power and radial force, while in the state of impeller rotation, the axial force and radial force uneven and generate of load make axis
Displacement axially and radially is generated, air hydrodynamic transverse bearing provides radial carrying at this time, and air hydrodynamic thrust bearing provides axis
To carrying, so that axis be made to reduce in movement radially, axially, guarantee the not upper and lower play of axis to keep stable.It can in centrifugal process
Pressure in the pump housing is adjusted by pressure plug, prevents pressure in the pump housing excessive；Pass through liquid in bleeder valve discharge pump body after centrifugation
Body.
Principle: when motor driving shaft high speed rotation, due to gas dynamic pressure effect, in thrust button and air hydrodynamic thrust bearing
Between the air film (as shown in 7-4 in Fig. 3) that is formed bearing capacity is provided, prevent the axial movement of pump work process axis；Air is dynamic
The radial force that air between pressure transverse bearing and axis is generated due to air hydrodynamic effect prevents axis radial motion.
The utility model has the beneficial effects that
(1) the utility model provides bearing capacity using air hydrodynamic bearing, without physics between axle journal and air hydrodynamic bearing
Contact is not necessarily to lubricating oil or lubricating grease system, simplifies the structure of vertical centrifugal pump；
(2) the utility model uses paillon formula air hydrodynamic bearing, and paillon formula is empty for other opposite aero dynamic bearings
Pneumatic pressure bearing load carrying capacity is higher；
(3) the utility model uses air hydrodynamic bearing, for liquid-bearing, precision height, power consumption high with revolving speed
The advantages that low and service life is long；For aerostatic bearing, aerostatic bearing needs higher supply gas pressure, and it is not necessarily to supply
Gas.When impeller size is identical, higher axis revolving speed can increase centrifugal pump lift and flow；
(4) lubricant medium used in the air hydrodynamic bearing configured by the utility model vertical centrifugal pump is air,
So it has many advantages, such as completely cleaning, energy high temperature resistant and low temperature, and the structure has preferable lubrication property, effectively increases axis
The service life with centrifugal pump is held, maintenance capacity is reduced；
(5) the utility model is provided with coolant liquid entrance in bearing housing side wall, improves heat resistance；
(6) outside of upper mechanical seal is arranged in air hydrodynamic bearing device, have clean cleaning, low power consuming, low noise,
Long-term operation, it is reliable for operation the advantages that.
Detailed description of the invention
FIG. 1 is a schematic structural view of the utility model；
Fig. 2 is the partial enlarged view at the position A in Fig. 1；
Fig. 3 is B-B sectional drawing (compliant foil air hydrodynamic transverse bearing schematic diagram) in Fig. 1；
Fig. 4 is C-C sectional drawing (compliant foil air hydrodynamic thrust bearing schematic diagram) in Fig. 2；
In figure: the 1- pump housing, 2- pressure plug, 3- pump cover, 4- exhaust valve, 5- cooling liquid outlet, 6- bearing housing, 7- air hydrodynamic
Transverse bearing, 7-1- positioning pin III, 7-2- bearing block, 7-3- transverse bearing wave foil, 7-4- air film, 7-5- transverse bearing top layer foil
Piece, thrust shaft block under 8-, 9- thrust button, the upper thrust shaft block of 10-, 11- axle journal IV, 12- bearing gland, the upper thrust shaft of 13-
It holds, 13-1- solder joint, 13-2- bottom plate, 13-3- thrust bearing wave foil, 13-4- thrust bearing top foil, 14- positioning pin II,
15- positioning pin I, thrust bearing under 16-, 17- thrust button positioning pin, 18- axle journal III, 19- coolant inlet, the upper machinery of 20- are close
It seals, mechanical seal under 21-, 22- impeller, 23- bleeder valve, 24- axle journal II, 25- axle journal I.
Specific embodiment
With reference to embodiment, the utility model is described in further detail.
Embodiment 1
As shown in Figs 1-4, a kind of vertical centrifugal pump configuring air hydrodynamic bearing, including pump case, impeller 22, machinery are close
Envelope, axis and air hydrodynamic bearing；Wherein, air hydrodynamic bearing includes air hydrodynamic transverse bearing 7 and two groups of air hydrodynamic thrusts
Bearing (upper thrust bearing 13 and lower thrust bearing 16, two groups of air hydrodynamic thrust bearing structures are identical)；
The pump case includes the pump housing 1, pump cover 3, bearing housing 6 and bearing gland 12, and pump cover 3 is located in bearing housing 6, the pump housing 1
It is bolted respectively with pump cover 3, the pump housing 1 and bearing housing 6, bearing housing 6 and bearing gland 12；1 side of the pump housing is equipped with pressure
Plug 2 and exhaust valve 4, exhaust valve 4 are located at 1 top side wall of the pump housing, and 1 bottom of the pump housing is equipped with bleeder valve 23；6 side wall of bearing housing is equipped with
Coolant inlet 19 and cooling liquid outlet 5；
Axis includes four sections of axle journals, respectively axle journal I 25, axle journal II 24, axle journal III 18 and axle journal IV 11, is collectively constituted complete
Axis；One end of axle journal I 25 is connected through a screw thread with impeller 22, and impeller 22 is placed in the space that the pump housing 1 and pump cover 3 are formed；Axis
Be mechanical seal outside neck II 24, mechanical seal includes upper mechanical seal 20 and lower mechanical seal 21, upper mechanical seal 20 up and down
Both ends are connected through a screw thread fixation with bearing housing 6 and pump cover 3 respectively, and the upper end of lower mechanical seal 21 and pump cover 3 are connected by screw thread
Connect fixation；Air hydrodynamic transverse bearing 7 is mounted at axle journal III 18, is connect by bolt with lower thrust shaft block 8；Lower thrust shaft
Hold 16 and upper thrust bearing 13 be mounted on axle journal IV 11 with III 18 junction of axle journal, lower thrust bearing 16 pass through positioning pin I 15
It is fixed on lower thrust shaft block 8, upper thrust bearing 13 is fixed on thrust shaft block 10 by positioning pin II 14, lower thrust
Bearing block 8 is bolted on bearing housing 6, and upper thrust shaft block 10 is bolted to bearing by bearing gland 12
On case 6；Thrust button 9 is equipped between lower thrust bearing 16 and upper thrust bearing 13, thrust button 9 is fixed by thrust button positioning pin 17
On axis；IV 11 one end of axle journal is stretched out by bearing gland 12, is equipped with keyway above.
Embodiment 2
The present embodiment is substantially the same with 1 structure of embodiment, the difference is that: the diameter of four sections of axle journals are as follows: I 25 < of axle journal
II 24 < axle journal III 18 of axle journal, III 18 > axle journal IV 11 of axle journal；
Embodiment 3
The present embodiment is substantially the same with 1 structure of embodiment, the difference is that: the air hydrodynamic transverse bearing is elasticity
Foil air dynamical pressure radial bearing, including transverse bearing top foil 7-5, transverse bearing wave foil 7-3 and bearing block 7-2, from outer
To the interior concentric ring for being followed successively by bearing block 7-2, transverse bearing wave foil 7-3 and transverse bearing top foil 7-5 formation, bearing block 7-
2 are equipped with III 7-1 of positioning pin, and compliant foil air hydrodynamic transverse bearing is 360 ° of compliant foil air hydrodynamic radial axles of complete cycle formula
It holds；
The air hydrodynamic thrust bearing is compliant foil air hydrodynamic thrust bearing, including bottom plate 13-2, thrust bearing
Wave foil 13-3 and thrust bearing top foil 13-4, bottom plate 13-2 are annular shape, and thrust bearing wave foil 13-3 is circumferentially uniformly set
It sets on bottom plate 13-2, thrust bearing top foil 13-4 is uniformly distributed circumferentially on thrust bearing wave foil 13-3, bottom plate 13-
There are several solder joint 13-1 on 2, when installation, thrust bearing top foil 13-4 is towards thrust button 9.Compliant foil air hydrodynamic thrust
Bearing top foil number is three watts.
Embodiment 4
The present embodiment is substantially the same with 3 structure of embodiment, the difference is that: compliant foil air hydrodynamic transverse bearing is
Three watts of compliant foil air hydrodynamic transverse bearings；Compliant foil air hydrodynamic thrust bearing top foil number is four watts.
Embodiment 5
The present embodiment is substantially the same with 3 structure of embodiment, the difference is that: compliant foil air hydrodynamic transverse bearing is
Four watts of compliant foil air hydrodynamic transverse bearings；Compliant foil air hydrodynamic thrust bearing top foil number is five watts.
Embodiment 6
The present embodiment is substantially the same with 3 structure of embodiment, the difference is that: compliant foil air hydrodynamic transverse bearing is
Five watts of compliant foil air hydrodynamic transverse bearings；Compliant foil air hydrodynamic thrust bearing top foil number is six watts.
Embodiment 7
The present embodiment is substantially the same with 3 structure of embodiment, the difference is that: compliant foil air hydrodynamic transverse bearing is
Six watts of compliant foil air hydrodynamic transverse bearings；Compliant foil air hydrodynamic thrust bearing top foil number is seven watts.
Embodiment 8
The present embodiment is substantially the same with 3 structure of embodiment, the difference is that: compliant foil air hydrodynamic transverse bearing is
Eight watts of compliant foil air hydrodynamic transverse bearings；Compliant foil air hydrodynamic thrust bearing top foil number is eight watts.
Centrifugal pump of horizontal axis in above embodiments may each be centrifugal multistage pump multiple centrifugal pump.
Specific embodiment of the utility model is explained in detail above in conjunction with attached drawing, but the utility model and unlimited
In above-described embodiment, within the knowledge of a person skilled in the art, the utility model can also not departed from
Various changes can be made under the premise of objective.
Claims (8)
1. a kind of vertical centrifugal pump for configuring air hydrodynamic bearing, including pump case, impeller (22), mechanical seal, axis and air are dynamic
Last item is held；Wherein, air hydrodynamic bearing includes air hydrodynamic transverse bearing (7) and two groups of air hydrodynamic thrust bearings, and two groups empty
Pneumatic pressure thrust bearing structure is identical, respectively upper thrust bearing (13) and lower thrust bearing (16)；
The pump case includes the pump housing (1), pump cover (3), bearing housing (6) and bearing gland (12), and pump cover (3) is located at bearing housing (6)
Interior, the pump housing (1) and pump cover (3), the pump housing (1) and bearing housing (6), bearing housing (6) and bearing gland (12) are connected by bolt respectively
It connects；The pump housing (1) side is equipped with pressure plug (2) and exhaust valve (4), and exhaust valve (4) is located at the pump housing (1) top side wall, the pump housing (1) bottom
Portion is equipped with bleeder valve (23)；Bearing housing (6) side wall is equipped with coolant inlet (19) and cooling liquid outlet (5)；
Axis includes four sections of axle journals, respectively axle journal I (25), axle journal II (24), axle journal III (18) and axle journal IV (11), is collectively constituted
Complete axis；One end of axle journal I (25) is connect with impeller (22), and impeller (22) is placed in the space that the pump housing (1) and pump cover (3) is formed
It is interior；Axle journal II (24) is outside mechanical seal, and mechanical seal includes upper mechanical seal (20) and lower mechanical seal (21), and upper machinery is close
The upper and lower ends of envelope (20) are connected and fixed with bearing housing (6) and pump cover (3) respectively, the upper end of lower mechanical seal (21) and pump cover
(3) it is connected and fixed；Air hydrodynamic transverse bearing (7) is mounted at axle journal III (18), is connected by bolt and lower thrust shaft block (8)
It connects；Lower thrust bearing (16) and upper thrust bearing (13) are mounted on axle journal IV (11) and axle journal III (18) junction, lower thrust
Bearing (16) is fixed on lower thrust shaft block (8) by positioning pin I (15), and upper thrust bearing (13) passes through positioning pin II (14)
It is fixed on thrust shaft block (10), lower thrust shaft block (8) is bolted on bearing housing (6), upper thrust bearing
Seat (10) is bolted on bearing housing (6) by bearing gland (12)；Lower thrust bearing (16) and upper thrust bearing
(13) thrust button (9) are equipped between, thrust button (9) is fixed on axis by thrust button positioning pin (17)；Axle journal IV (11) one end
It is stretched out by bearing gland (12), is equipped with keyway above.
2. vertical centrifugal pump according to claim 1, which is characterized in that the vertical centrifugal pump is centrifugal pump of single stage type or more
Grade centrifugal pump.
3. vertical centrifugal pump according to claim 1, which is characterized in that the diameter of four sections of axle journals are as follows: axle journal I (25) < axis
Neck II (24) < axle journal III (18), axle journal III (18) > axle journal IV (11).
4. vertical centrifugal pump according to claim 1, which is characterized in that the air hydrodynamic transverse bearing is compliant foil
Air hydrodynamic transverse bearing, including transverse bearing top foil (7-5), transverse bearing wave foil (7-3) and bearing block (7-2), from
The concentric ring that bearing block (7-2), transverse bearing wave foil (7-3) and transverse bearing top foil (7-5) are formed is followed successively by outside,
Bearing block (7-2) is equipped with positioning pin III (7-1).
5. vertical centrifugal pump according to claim 4, which is characterized in that compliant foil air hydrodynamic transverse bearing is complete cycle
360 ° of compliant foil air hydrodynamic transverse bearings of formula, three watts of compliant foil air hydrodynamic transverse bearings, four watts of compliant foil air
Dynamical pressure radial bearing, five watts of compliant foil air hydrodynamic transverse bearings, six watts of compliant foil air hydrodynamic transverse bearings and eight watts
Any one in compliant foil air hydrodynamic transverse bearing.
6. vertical centrifugal pump according to claim 1, which is characterized in that the air hydrodynamic thrust bearing is compliant foil
Air hydrodynamic thrust bearing, including bottom plate (13-2), thrust bearing wave foil (13-3) and thrust bearing top foil (13-4), bottom
Plate (13-2) is annular shape, and thrust bearing wave foil (13-3) is uniformly arranged in the circumferential direction on bottom plate (13-2), thrust bearing top layer
Paillon (13-4) is uniformly distributed circumferentially on thrust bearing wave foil (13-3), there is several solder joints (13-1) on bottom plate (13-2).
7. vertical centrifugal pump according to claim 6, which is characterized in that compliant foil air hydrodynamic thrust bearing top layer foil
The piece number is three watts, four watts, five watts, six watts, seven watts or eight watts.
8. vertical centrifugal pump according to claim 6 or 7, which is characterized in that compliant foil air hydrodynamic thrust bearing peace
When dress, thrust bearing top foil (13-4) is towards thrust button (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820840879.4U CN208518910U (en) | 2018-06-01 | 2018-06-01 | A kind of vertical centrifugal pump configuring air hydrodynamic bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820840879.4U CN208518910U (en) | 2018-06-01 | 2018-06-01 | A kind of vertical centrifugal pump configuring air hydrodynamic bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208518910U true CN208518910U (en) | 2019-02-19 |
Family
ID=65339091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820840879.4U Expired - Fee Related CN208518910U (en) | 2018-06-01 | 2018-06-01 | A kind of vertical centrifugal pump configuring air hydrodynamic bearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208518910U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108757492A (en) * | 2018-06-01 | 2018-11-06 | 昆明理工大学 | A kind of vertical centrifugal pump of configuration air hydrodynamic bearing |
-
2018
- 2018-06-01 CN CN201820840879.4U patent/CN208518910U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108757492A (en) * | 2018-06-01 | 2018-11-06 | 昆明理工大学 | A kind of vertical centrifugal pump of configuration air hydrodynamic bearing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190219 Termination date: 20200601 |
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| CF01 | Termination of patent right due to non-payment of annual fee |