CN211648054U - Vertical valve type hydraulic oscillator - Google Patents
Vertical valve type hydraulic oscillator Download PDFInfo
- Publication number
- CN211648054U CN211648054U CN202020196033.9U CN202020196033U CN211648054U CN 211648054 U CN211648054 U CN 211648054U CN 202020196033 U CN202020196033 U CN 202020196033U CN 211648054 U CN211648054 U CN 211648054U
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- 238000000034 method Methods 0.000 claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims description 64
- 230000010355 oscillation Effects 0.000 claims description 21
- 125000006850 spacer group Chemical group 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 6
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 description 22
- 239000012530 fluid Substances 0.000 description 20
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The utility model relates to a found valve type hydraulic oscillator belongs to tool equipment technical field in the pit. This found valve formula hydraulic oscillator, compact structure design benefit adopts a kind to found the valve formula structure and has replaced traditional rotary valve formula structure, has solved current rotary valve and has rotated the in-process and can produce the problem of wearing and tearing with the fixed valve. In addition, the utility model also adopts a turbine group 5 structure to replace the prior snake-shaped rotor (namely a screw motor); the use requirement can be met without using a rubber part; the service life of the hydraulic oscillator is prolonged; thereby the problem that the service life that has had in the current hydraulic oscillator is short has been solved, people's user demand has been satisfied.
Description
Technical Field
The utility model relates to a found valve type hydraulic oscillator belongs to tool equipment technical field in the pit.
Background
The hydraulic oscillator is an effective tool for finally reducing static friction, increasing the penetration depth and improving the drilling and grinding efficiency in the horizontal well by using the coiled tubing. The hydroscillators that have been used today oscillate by the principle of rotary valve pulsing. For example, CN205477369U discloses a hydraulic oscillator, which operates by a serpentine rotor (i.e., a screw motor) to drive a rotary valve. The problem that the rotary valve and the fixed valve are abraded in the rotating process, and the problem that the service life of an existing hydraulic oscillator is short is further caused. In addition, the snake-shaped rotor (namely the screw motor) is provided with a rubber part which has the problems of no high temperature resistance and short service life, thereby further shortening the service life of the hydraulic oscillator. Therefore, in order to solve the above problems of the conventional hydraulic oscillator, it is necessary to develop a new hydraulic oscillator to solve the above problems of the conventional hydraulic oscillator.
Disclosure of Invention
The utility model aims to provide a: the vertical valve type hydraulic oscillator is compact in structure and ingenious in design and solves the problem that the existing hydraulic oscillator is short in service life.
The technical scheme of the utility model is that:
a vertical valve type hydraulic oscillator is composed of an oscillation generator and a pulse generator; the lower end of the oscillation generator is connected with a pulse generator in a threaded manner; the method is characterized in that: the pulse generator consists of an upper joint, an outer pipe, a turbine group, a transmission shaft, a transmission sleeve, a vertical movable valve, a valve sleeve, a positioning sleeve and a lower joint; the upper end of the outer pipe is in threaded connection with an upper joint; the lower end of the outer pipe is connected with a lower joint in a threaded manner; the inner part of the outer pipe is provided with a turbine group through a positioning nut; a shunting cap is fixedly arranged at the upper end of a turbine shaft of the turbine group; the lower end of a turbine shaft of the turbine group is connected with a transmission shaft through threads; a transmission sleeve is arranged below the transmission shaft in a sliding manner through a spline ring; after the transmission shaft extends into the transmission sleeve, the transmission sleeve is in sliding connection with the transmission sleeve through a fixedly-mounted driving pin; the lower end of the transmission sleeve is in threaded connection with a vertical moving valve; a valve sleeve is fixedly arranged in the outer pipe at the outer side of the vertical type moving valve through a positioning sleeve; the vertical type moving valve is connected with the valve sleeve in a sliding mode.
The circumferential surface of the valve sleeve is uniformly distributed with circulation holes; the vertical valve is connected with the flow hole intermittently in a sealing manner.
The transmission sleeve is provided with a balance hole; the interior of the transmission sleeve is communicated with the outside through a balance hole; the spline groove is arranged outside the transmission sleeve; the transmission sleeve is connected with the spline ring in a sliding mode through the spline groove.
The circumferential surface of the transmission shaft is provided with a track guide groove; the track guide groove is in a structure of communicating end to end, and the expanded track of the track guide groove is consistent with a sine function curve; the driving pin is slidably connected with the track guide groove.
The oscillation generator consists of an upper cylinder, a middle cylinder, a lower cylinder, a connecting cylinder, a connector, an upper central tube, a lower central tube, a driving piston and a disc spring; the upper end of the middle barrel is in threaded connection with an upper barrel; the lower end of the middle cylinder is connected with a lower cylinder through threads; the lower end of the lower barrel is connected with a connector through a connecting barrel thread; an upper central tube is slidably arranged in the middle cylinder through a spacer bush; the upper end of the upper central tube extends to the upper part of the upper barrel; the lower end of the upper central tube is in threaded connection with a lower central tube; the lower end of the lower central tube is fixedly provided with a driving piston through a fixing nut; the driving piston is connected with the lower cylinder in a sliding and sealing manner; a disc spring is arranged on the upper central pipe above the lower central pipe through a locking nut; the disc spring is respectively connected with the spacer bush and the locking nut in a butting way.
The connector is in threaded connection with an upper connector of the pulse generator; a bypass safety valve is fixedly arranged inside the connector; the bypass safety valve is intermittently communicated with a bypass hole arranged on the connecting head.
The fixing nut is intermittently abutted and connected with the upper end of the connecting cylinder.
The utility model has the advantages that:
this found valve formula hydraulic oscillator, compact structure design benefit adopts a kind to found the valve formula structure and has replaced traditional rotary valve formula structure, has solved current rotary valve and has rotated the in-process and can produce the problem of wearing and tearing with the fixed valve. In addition, the utility model also adopts a turbine group 5 structure to replace the prior snake-shaped rotor (namely a screw motor); the use requirement can be met without using a rubber part; the service life of the hydraulic oscillator is prolonged; thereby the problem that the service life that has had in the current hydraulic oscillator is short has been solved, people's user demand has been satisfied.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural diagram of the oscillation generator of the present invention;
FIG. 3 is a schematic structural diagram of the pulse generator of the present invention;
fig. 4 is a schematic structural view of the transmission sleeve of the present invention;
fig. 5 is a schematic structural view of the transmission shaft of the present invention;
fig. 6 is an enlarged schematic view of a portion a in fig. 3.
In the figure: 1. the vibration generator comprises a vibration generator 2, a pulse generator 3, an upper connector 4, an outer pipe 5, a turbine group 6, a transmission shaft 7, a transmission sleeve 8, a vertical moving valve 9, a valve sleeve 10, a positioning sleeve 11, a lower connector 12, a positioning nut 13, a flow dividing cap 14, a spline ring 15, a flow hole 16, a driving pin 17, a balance hole 18, a track guide groove 19, an upper cylinder 20, a middle cylinder 21, a lower cylinder 22, a connecting cylinder 23, a connector 24, a bypass safety valve 25, a bypass hole 26, a spacer sleeve 27, an upper central pipe 28, a lower central pipe 29, a fixing nut 30, a driving piston 31, a locking nut 32 and a disc spring.
Detailed Description
The vertical valve type hydraulic oscillator is composed of an oscillation generator 1 and a pulse generator 2; the lower end of the oscillation generator 1 is connected with a pulse generator 2 through threads (see the attached figure 1 in the specification).
The oscillation generator 1 is composed of an upper cylinder 19, an intermediate cylinder 20, a lower cylinder 21, a connecting cylinder 22, a connecting head 23, an upper central tube 27, a lower central tube 28, a driving piston 30 and a disc spring 32 (see the description and the attached figure 2).
The upper end of the middle barrel 20 is connected with an upper barrel 19 in a threaded manner; the lower end of the middle cylinder 20 is connected with a lower cylinder 21 in a threaded manner; the lower end of the lower barrel 21 is connected with a connector 23 through a connecting barrel 22 in a threaded manner; the lower end of the connector 23 is connected with the pulse generator 2 through screw threads.
An upper central tube 27 is slidably mounted inside the intermediate cylinder 20 through a spacer 26; the upper end of the upper center tube 27 extends above the upper barrel 19.
The lower end of the upper central tube 27 is in threaded connection with a lower central tube 28; the lower end of the lower central tube 28 is fixedly provided with a driving piston 30 through a fixing nut 29; the driving piston 30 is connected with the lower cylinder 21 in a sliding and sealing way; in operation, when the drilling fluid pressure inside the oscillation generator 1 changes, it will push the drive piston 30 to move inside the lower cylinder 21.
A disc spring 32 is arranged on the upper central tube 27 above the lower central tube 28 through a locking nut 31; the disc spring 32 is respectively connected with the spacer 26 and the locking nut 31 in an interference mode. When the piston 30 is driven to drive the lower central tube 28, the upper central tube 27 and the locking nut 31 to move upwards, the locking nut 31 can press the disc spring 32 under the cooperation of the spacer 26, so that the disc spring is pressed and deformed; when the drilling hydraulic pressure in the oscillation generator 1 is reduced, the lower central tube 28 and the upper central tube 27 can be quickly reset under the action of the elastic force of the disc spring 32; therefore, when the drilling fluid pressure inside the oscillation generator 1 generates pulse type change, the lower central tube 28 and the upper central tube 27 can continuously move up and down under the cooperation of the disc spring 32 and the driving piston 30, and the oscillation purpose is achieved.
The fixing nut 29 is intermittently interference-connected with the upper end of the engaging cylinder 22 (see the attached figure 2 of the specification). The lower central tube 28 always has a downward movement tendency under the action of the elastic force of the disc spring 32; when the lower center tube 28 is in the downward extreme position, it is in interference engagement with the upper end of the adapter cylinder 22; the lower limit position of the lower central tube 28 can be limited by the connecting cylinder 22, and the lower central tube 28 can be limited in the lower cylinder 21 by the connecting cylinder 22, so that the lower central tube can only act in the lower cylinder 21, and the slipping accident of the lower central tube 28 is avoided.
A bypass safety valve 24 (see the description and the attached figure 2) is fixedly arranged inside the connecting head 23; the bypass safety valve 24 is intermittently communicated with a bypass hole 25 arranged on the connecting head 23. The bypass safety valve 24 is an existing standard device, and when the pressure inside the oscillation generator 1 is too high, the bypass safety valve 24 can be communicated with the bypass hole 25 to release the pressure under the action of the pressure; therefore, the safety performance of the hydraulic oscillator can be improved, and the problem of damage caused by overhigh internal pressure of the oscillation generator 1 is solved.
The lower end of the oscillation generator 1 is connected with the pulse generator 2 through a connector 23 in a threaded manner. The impulse generator 2 is composed of an upper connector 3, an outer pipe 4, a turbine group 5, a transmission shaft 6, a transmission sleeve 7, a vertical type movable valve 8, a valve sleeve 9, a positioning sleeve 10 and a lower connector 11 (see the attached figure 3 in the specification).
The upper end of the outer pipe 4 is connected with an upper joint 3 through threads; the upper connector 3 is in threaded connection with the connector 23. The lower end of the outer tube 4 is connected with a lower joint 11 through screw threads.
The inner part of the outer pipe 4 is provided with a turbine group 5 through a positioning nut 12; the turbine set 5 is a commonly used existing component of downhole tools. When drilling fluid passes through the inside of the turbine group 5, the turbine shaft in the turbine group 5 continuously rotates under the impact of the drilling fluid.
A shunting cap 13 is fixedly arranged at the upper end of a turbine shaft of the turbine group 5 (see the attached figure 3 in the specification); the top of the shunting cap 13 is of an arc-shaped structure; the purpose of arranging the diverter cap 13 is to: so that the drilling fluid entering the pulse generator 2 can uniformly enter the turbine group 5 along the arc surface of the flow dividing cap 13, and the turbine shaft in the turbine group 5 can generate stable rotation.
The lower end of a turbine shaft of the turbine group 5 is connected with a transmission shaft 6 through threads; when the turbine shaft of the turbine group 5 rotates, the transmission shaft 6 can be driven to synchronously rotate.
The circumferential surface of the transmission shaft 6 is provided with a track guide groove 18 (see the description and the attached figure 5); the track guide groove 18 is in a structure of end-to-end communication, and the expanded track of the track guide groove is consistent with a sine function curve.
The lower part of the transmission shaft 6 is slidably provided with a transmission sleeve 7 through a spline ring 14 (see the attached figures 3 and 6 in the specification).
The transmission sleeve 7 is provided with a balance hole 17 (see the attached figure 4 in the specification); the interior of the transmission sleeve 7 is communicated with the outside through a balance hole 17; the balancing holes 17 are provided for the purpose of: so that the inside of the transmission sleeve 7 can be communicated with the outside through the balance hole 17, thereby avoiding the problem that the transmission shaft 6 is blocked due to the pressure build-up inside the transmission sleeve 7 during working.
The transmission sleeve 7 is externally provided with a spline groove (see the attached figure 4 in the specification); the driving sleeve 7 is connected with the spline ring 14 in a sliding way through a spline groove. Under the action of the spline ring 14, the transmission sleeve 7 can only move up and down along the spline ring 14 and can not rotate.
A communicating hole is arranged in the spline ring 14; in operation drilling fluid may pass through the splined ring 14 via the communication holes.
The transmission shaft 6 extends into the transmission sleeve 7, and the transmission sleeve 7 is connected with the track guide groove 18 in a sliding manner through a fixedly mounted driving pin 16; the turbine shaft of the turbine group 5 can drive the transmission shaft 6 to synchronously rotate during operation; and the driving sleeve 7 can only move up and down along the spline ring 14 and can not rotate. When the transmission shaft 6 rotates, the track guide groove 18 can rotate relative to the driving pin 16 on the transmission sleeve 7; therefore, the transmission shaft 6 can drive the transmission sleeve 7 to repeatedly move up and down ceaselessly under the matching of the track guide groove 18 and the driving pin 16 in the rotating process.
The lower end of the transmission sleeve 7 is in threaded connection with a vertical moving valve 8; the vertical type moving valve 8 can be driven to synchronously move up and down in the moving process of the transmission sleeve 7.
A valve sleeve 9 is fixedly arranged in the outer tube 4 outside the vertical type valve 8 through a positioning sleeve 10 (see the attached figure 3 in the specification); the vertical valve 8 is slidably connected with the valve sleeve 9. The circumferential surface of the valve sleeve 9 is uniformly distributed with circulation holes 15. In the process that the vertical moving valve 8 repeatedly moves up and down, the flow hole 15 can be repeatedly opened and sealed through the vertical moving valve 8; because the circulation hole 15 is a circulation channel of the drilling fluid, the drilling fluid in the pulse generator 2 can generate periodic pressure pulses in the process of ceaselessly opening and sealing the circulation hole 15, and the purpose of providing oscillation power for the hydraulic oscillator is further achieved.
When the vertical valve type hydraulic oscillator works, drilling fluid can enter the interior of the pulse generator 2 through the upper central pipe 27, the lower central pipe 28, the connecting cylinder 22, the bypass safety valve 24 and the connector 23 in the oscillation generator 1.
After entering the interior of the pulse generator 2, the drilling fluid passes through the turbine set 5 along the upper joint 3 and the outer pipe 4, in the process the drilling fluid drives the turbine shaft of the turbine set 5 to rotate. The turbine shaft of the turbine group 5 can drive the transmission shaft 6 to synchronously rotate in the rotating process.
In the rotating process of the transmission shaft 6, the track guide groove 18 on the surface can rotate relative to the driving pin 16 on the transmission sleeve 7; therefore, the transmission shaft 6 can drive the transmission sleeve 7 to repeatedly move up and down ceaselessly under the matching of the track guide groove 18 and the driving pin 16 in the rotating process.
The transmission sleeve 7 can drive the vertical moving valve 8 to move synchronously in the process of ceaselessly and repeatedly moving up and down. In the process that the vertical moving valve 8 repeatedly moves up and down, the flow hole 15 can be repeatedly opened and sealed through the vertical moving valve 8; because the circulation hole 15 is a circulation passage of the drilling fluid, the drilling fluid in the pulse generator 2 can generate periodic pressure pulses in the process of continuously opening and sealing the circulation hole 15, and the pressure of the drilling fluid is periodically increased and decreased.
The drilling fluid generates periodic pressure pulses that will eventually be transmitted to the drive piston 30 of the oscillation generator 1. Since the pressure of the drilling fluid is periodically increased and decreased, when the pressure of the drilling fluid is increased, the drilling fluid drives the lower central tube 28 and the lock nut 31 to move upwards by overcoming the elastic force of the disc spring 32 through the driving piston 30, and when the pressure of the drilling fluid is decreased, the lower central tube 28 can be rapidly reset under the elastic force of the disc spring 32. Therefore, in the process of generating pulse type change of the drilling fluid pressure, the lower central tube 28 can continuously move up and down under the coordination of the disc spring 32 and the driving piston 30, and the purpose of oscillation is further achieved.
This found valve formula hydraulic oscillator, compact structure design benefit adopts a kind to found the valve formula structure and has replaced traditional rotary valve formula structure, has solved current rotary valve and has rotated the in-process and can produce the problem of wearing and tearing with the fixed valve. In addition, the utility model also adopts a turbine group 5 structure to replace the prior snake-shaped rotor (namely a screw motor); the use requirement can be met without using a rubber part; the service life of the hydraulic oscillator is prolonged; thereby the problem that the service life that has had in the current hydraulic oscillator is short has been solved, people's user demand has been satisfied.
Claims (7)
1. A vertical valve type hydraulic oscillator is composed of an oscillation generator (1) and a pulse generator (2); the lower end of the oscillation generator (1) is connected with a pulse generator (2) through threads; the method is characterized in that: the pulse generator (2) is composed of an upper joint (3), an outer pipe (4), a turbine group (5), a transmission shaft (6), a transmission sleeve (7), a vertical moving valve (8), a valve sleeve (9), a positioning sleeve (10) and a lower joint (11); the upper end of the outer pipe (4) is connected with an upper joint (3) in a threaded manner; the lower end of the outer pipe (4) is connected with a lower joint (11) in a threaded manner; the turbine group (5) is arranged in the outer pipe (4) through a positioning nut (12); a shunting cap (13) is fixedly arranged at the upper end of a turbine shaft of the turbine group (5); the lower end of a turbine shaft of the turbine group (5) is connected with a transmission shaft (6) through threads; a transmission sleeve (7) is arranged below the transmission shaft (6) in a sliding way through a spline ring (14); after the transmission shaft (6) extends into the transmission sleeve (7), the transmission sleeve (7) is connected with the transmission shaft (6) in a sliding way through a fixedly-mounted driving pin (16); the lower end of the transmission sleeve (7) is in threaded connection with a vertical moving valve (8); a valve sleeve (9) is fixedly arranged in the outer tube (4) at the outer side of the vertical type moving valve (8) through a positioning sleeve (10); the vertical type moving valve (8) is connected with the valve sleeve (9) in a sliding way.
2. A vertical valve hydroscillator as defined in claim 1 wherein: circulation holes (15) are uniformly distributed on the circumferential surface of the valve sleeve (9); the vertical movable valve (8) is intermittently and hermetically connected with the circulation hole (15).
3. A vertical valve hydroscillator as defined in claim 2 wherein: a balance hole (17) is arranged on the transmission sleeve (7); the interior of the transmission sleeve (7) is communicated with the outside through a balance hole (17); the spline groove is arranged outside the transmission sleeve (7); the transmission sleeve (7) is connected with the spline ring (14) in a sliding way through the spline groove.
4. A vertical valve hydroscillator as defined in claim 3 wherein: a track guide groove (18) is arranged on the circumferential surface of the transmission shaft (6); the track guide groove (18) is in a structure of being communicated end to end, and the expanded track of the track guide groove is consistent with a sine function curve; the driving pin (16) is connected with the track guide groove (18) in a sliding mode.
5. A vertical valve hydroscillator as defined in claim 4 wherein: the oscillation generator (1) is composed of an upper cylinder (19), a middle cylinder (20), a lower cylinder (21), a connecting cylinder (22), a connector (23), an upper central tube (27), a lower central tube (28), a driving piston (30) and a disc spring (32); the upper end of the middle cylinder (20) is connected with an upper cylinder (19) in a threaded manner; the lower end of the middle cylinder (20) is connected with a lower cylinder (21) in a threaded manner; the lower end of the lower barrel (21) is connected with a connector (23) through a connecting barrel (22) in a threaded manner; an upper central tube (27) is slidably arranged in the middle cylinder (20) through a spacer bush (26); the upper end of the upper central tube (27) extends to the upper part of the upper barrel (19); the lower end of the upper central tube (27) is in threaded connection with a lower central tube (28); the lower end of the lower central tube (28) is fixedly provided with a driving piston (30) through a fixing nut (29); the driving piston (30) is connected with the lower cylinder (21) in a sliding and sealing way; a disc spring (32) is arranged on the upper central tube (27) above the lower central tube (28) through a locking nut (31); the disc spring (32) is respectively connected with the spacer bush (26) and the locking nut (31) in an abutting mode.
6. A vertical valve hydroscillator as defined in claim 5 wherein: the connector (23) is in threaded connection with the upper connector (3) of the pulse generator (2); a bypass safety valve (24) is fixedly arranged in the connector (23); the bypass safety valve (24) is intermittently communicated with a bypass hole (25) arranged on the connector (23).
7. A vertical valve hydroscillator as defined in claim 6 wherein: the fixing nut (29) is intermittently connected with the upper end of the connecting cylinder (22) in an abutting mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020196033.9U CN211648054U (en) | 2020-02-23 | 2020-02-23 | Vertical valve type hydraulic oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020196033.9U CN211648054U (en) | 2020-02-23 | 2020-02-23 | Vertical valve type hydraulic oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211648054U true CN211648054U (en) | 2020-10-09 |
Family
ID=72685219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020196033.9U Expired - Fee Related CN211648054U (en) | 2020-02-23 | 2020-02-23 | Vertical valve type hydraulic oscillator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211648054U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112681994A (en) * | 2021-03-22 | 2021-04-20 | 成都迪普金刚石钻头有限责任公司 | Low-pressure-consumption high-amplitude hydraulic pulse device and method |
| CN113640001A (en) * | 2021-07-12 | 2021-11-12 | 北京航空航天大学 | Generator for generating pulsating flow under high back pressure environment |
-
2020
- 2020-02-23 CN CN202020196033.9U patent/CN211648054U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112681994A (en) * | 2021-03-22 | 2021-04-20 | 成都迪普金刚石钻头有限责任公司 | Low-pressure-consumption high-amplitude hydraulic pulse device and method |
| CN112681994B (en) * | 2021-03-22 | 2021-07-13 | 成都迪普金刚石钻头有限责任公司 | Low-pressure-consumption high-amplitude hydraulic pulse device and method |
| CN113640001A (en) * | 2021-07-12 | 2021-11-12 | 北京航空航天大学 | Generator for generating pulsating flow under high back pressure environment |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201009 |