CN212535579U - Double-eccentric follow-up deviation adjusting mechanism suitable for wellhead packing box - Google Patents
Double-eccentric follow-up deviation adjusting mechanism suitable for wellhead packing box Download PDFInfo
- Publication number
- CN212535579U CN212535579U CN202020815052.5U CN202020815052U CN212535579U CN 212535579 U CN212535579 U CN 212535579U CN 202020815052 U CN202020815052 U CN 202020815052U CN 212535579 U CN212535579 U CN 212535579U
- Authority
- CN
- China
- Prior art keywords
- eccentric
- oil pipe
- central axis
- head
- threaded connector
- 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.)
- Expired - Fee Related
Links
- 238000012856 packing Methods 0.000 title claims abstract description 32
- 230000007246 mechanism Effects 0.000 title claims abstract description 21
- 230000006835 compression Effects 0.000 claims abstract description 23
- 238000007906 compression Methods 0.000 claims abstract description 23
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 14
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 31
- 238000000034 method Methods 0.000 description 6
- 238000005086 pumping Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
Images
Landscapes
- Earth Drilling (AREA)
Abstract
The utility model discloses a two eccentric follow-up tunings partially mechanism suitable for well head packing box, include: the oil pipe packing box comprises an oil pipe threaded connector arranged on a well head, an inner eccentric head and an outer eccentric sleeve which are connected with the packing box, and a polish rod penetrating through the inner eccentric head and the outer eccentric sleeve of the oil pipe threaded connector; the oil pipe threaded connector is arranged in a central hole at the lower end of the outer eccentric sleeve and extends out of a part of the central hole; the inner eccentric head is arranged in the central hole at the upper end of the outer eccentric sleeve and extends out of a part of the central hole; the inner eccentric head is pressed tightly by the upper thread pressure ring; the oil pipe threaded connector is compressed by the lower threaded compression ring; the upper end surface and the lower end surface of the oil pipe threaded connector and the lower threaded compression ring compression surface are both provided with annular spherical grooves, and the ball group and the retainer are arranged; the upper end face and the lower end face of the inner eccentric head and the upper threaded compression ring compression face are both provided with annular spherical grooves, and the ball group and the retainer are mounted. The mechanism can automatically adjust deviation along with the motion of the polished rod, has simple structure, and reduces the installation and later maintenance time.
Description
Technical Field
The utility model relates to an oil field equipment technical field, concretely relates to two eccentric follow-up tuningout mechanisms suitable for well head packing box.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The existing pumping well of the oil field generally adopts packing seal to prevent crude oil from leaking, a packing box seal reciprocating polish rod is arranged at a well head, but in the actual production process, the displacement of the pumping unit can drive the polish rod to move, so that the axis of the polish rod deviates from the axis of the well head, the packing is eccentric, the service life is reduced, and the packing box frequently leaks, the existing packing box technology has flange type plane deviation adjustment and spherical deviation adjustment, and has primary, secondary and tertiary deviation adjustment, but most deviation adjustment works are carried out during installation, automatic deviation adjustment cannot be carried out in the working process, pressure must be released during manual deviation adjustment operation, the deviation adjustment process is complicated, trouble and labor are wasted, in the existing automatic deviation adjustment mechanism, the spherical deviation adjustment can only adjust the inclined deviation of a central axis, the radial deviation adjustment cannot be carried out, and the plane deviation adjustment has the defect that a larger force arm exists between a stress point and a deviation surface when the deviation occurs, the radial offset force acts on the offset block to generate a bending rotation trend, only partial components act radially, the reliability is poor, and the offset block is easy to block.
It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention, and is set forth for facilitating understanding of those skilled in the art. These solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present invention.
SUMMERY OF THE UTILITY MODEL
The utility model provides a two eccentric follow-up tunings partially mechanism suitable for wellhead packing box for in order to solve and overcome above-mentioned difficult problem, its simple structure can follow-up tunings partially, and extension packing life-span reduces and patrols the well and maintains the manual work.
A double eccentric servo offset mechanism suitable for a wellhead packing box, comprising: the oil pipe packing box comprises an oil pipe threaded connector arranged on a well head, an inner eccentric head and an outer eccentric sleeve which are connected with the packing box, and a polish rod penetrating through the inner eccentric head and the outer eccentric sleeve of the oil pipe threaded connector; the oil pipe threaded connector is arranged in a central hole at the lower end of the outer eccentric sleeve and extends out of a part of the central hole; the inner eccentric head is arranged in a central hole at the upper end of the outer eccentric sleeve and extends out of a part of the central hole; the inner eccentric head is compressed by the upper threaded compression ring; the oil pipe threaded connector is compressed by the lower threaded compression ring; the upper end surface and the lower end surface of the oil pipe threaded connector and the lower threaded compression ring compression surface are both provided with annular spherical grooves, and the ball group and the retainer are arranged; and the upper end surface and the lower end surface of the inner eccentric head and the upper thread compression ring compression surface are both provided with annular spherical grooves and are provided with ball groups and a retainer.
Furthermore, the oil pipe threaded connector is compressed by a lower threaded compression ring and is positioned by a lower positioning bolt; the inner eccentric head is pressed by the upper thread press ring and is positioned by the upper positioning bolt.
Furthermore, an annular groove is formed in the lower convex part of the inner eccentric head along the circumferential direction, and an upper slip ring sealing ring is installed on the annular groove; and an annular groove is formed in the upper convex edge of the oil pipe threaded connector along the circumferential direction, and a lower sliding ring type sealing ring is installed on the annular groove.
Further, the central axis of the inner eccentric head is superposed with the central axis of the eccentric hole of the outer eccentric sleeve, and the central axis of the polish rod is superposed with the central axis of the eccentric hole of the inner eccentric head; the oil pipe threaded connector coincides with a well head central shaft.
Further, the distance between the central axis of the eccentric hole of the outer eccentric sleeve and the central axis of the wellhead is fixed to be 8 mm; the distance between the central axis of the polished rod and the central axis of the eccentric hole of the outer eccentric sleeve is fixed to be 8 mm; the distance between the central axis of the polished rod and the central axis of the threaded connector of the oil pipe is an offset distance; the two-dimensional sections of the central axis of the polished rod, the central axis of the eccentric hole of the outer eccentric sleeve and the central axis of the threaded connector of the oil pipe form a triangle.
Furthermore, an outer eccentric sleeve rotating tool hole is formed in the outer eccentric sleeve.
The upper threaded pressing ring and the lower threaded pressing ring are both provided with threaded pressing ring tool holes; the bolt fixing positions of the upper positioning bolt and the lower positioning bolt are respectively provided with an upper positioning bolt spring pad and a lower positioning bolt spring pad.
Compared with the prior art, the beneficial effects of the utility model are that:
the rotating part of the utility model adopts the ball retainer assembly, has small rotating resistance and can follow up the rotation and offset in work. The arrangement of the double-eccentric structure converts the deviation adjusting movement into two rotating movements to be superposed, and the deviation adjusting movement is sensitive and smooth. Additionally the utility model discloses a rotary seal and configuration sliding ring seal's mode avoids the use face to seal, and the moving resistance is little, and the reliability is high. The upper thread pressing ring and the lower thread pressing ring are adopted to press the inner eccentric head and the oil pipe threaded connector, so that the disassembly, assembly and maintenance are facilitated. Go up the screw thread clamping ring and use positioning bolt spacing with lower screw thread clamping ring, can effectively prevent to go up screw thread clamping ring and lower screw thread clamping ring and take off in long-time working process.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, which specify the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the present invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for helping the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. The skilled person in the art can, under the teaching of the present invention, choose various possible shapes and proportional dimensions to implement the invention according to the specific situation. In the drawings:
fig. 1 is a two-dimensional sectional structure diagram of a double-eccentric follow-up deviation adjusting mechanism suitable for a wellhead packing box of the utility model;
fig. 2 is the utility model relates to a three-dimensional explosion structure sketch map of two eccentric follow-up tuningout mechanisms suitable for well head packing box.
FIG. 3 is the utility model discloses a whole outward appearance sketch map of two eccentric follow-up tuningout mechanisms suitable for well head packing box
Part names in the drawings are as follows:
1. the novel oil pipe polishing machine comprises an inner eccentric head, 2. a threaded press ring tool hole, 3. a ball group, 4. an outer eccentric sleeve rotating tool hole, 6. an outer eccentric sleeve, 7. a lower threaded press ring, 8. an oil pipe threaded connector, 9. a polished rod, 10. a lower positioning bolt spring pad, 11. a lower positioning bolt, 12. a lower sliding ring sealing ring, 13. a ball group retainer, 14. an upper sliding ring sealing ring, 16. an upper positioning bolt, 17. an upper positioning bolt spring pad and 18. an upper threaded press ring.
Detailed Description
In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in the figures, a double eccentric following deviation adjusting mechanism suitable for a wellhead packing box comprises: the device comprises an oil pipe threaded connector 8 arranged on a well head, an inner eccentric head 1 and an outer eccentric sleeve 6 which are connected with a packing box, and a polish rod 9 penetrating through the inner eccentric head 1 and the outer eccentric sleeve 6 of the oil pipe threaded connector 8; the convex edge of the oil pipe threaded connector 8 is arranged in a central hole at the lower end of the outer eccentric sleeve 6 and extends out of a part of the central hole; the convex edge of the inner eccentric head 1 is arranged in the central hole at the upper end of the outer eccentric sleeve 6 and extends out of a part of the central hole; the inner eccentric head 1 is compressed by an upper threaded compression ring 18; the oil pipe threaded connector 8 is tightly pressed by the lower threaded pressing ring 7; the upper end surface and the lower end surface of the oil pipe threaded connector 8 and the compression surface of the lower threaded compression ring 7 are both provided with annular spherical grooves, and the ball group 3 and the retainer 13 are mounted; interior eccentric head 1 the last lower terminal surface with go up the screw thread clamping ring 18 and compress tightly the face and all open annular spherical channel and install ball group 3 and holder 13, ball group 13 set up the frictional force that has reduced between the rotating part, can realize the automatic sensitive follow-up tuningout function at the course of the work of this mechanism, wherein outer eccentric cover 6 can be followed oil pipe threaded connection head 8 the central axis and rotated, and interior eccentric head 1 can be followed outer eccentric cover 6 and gone up the eccentric hole the central axis and rotate, realizes that no dead angle covers the function of two eccentric tuningouts in the within range. Further, the central axis of the inner eccentric head 1 is coincided with the central axis of the eccentric hole of the outer eccentric sleeve 6, and the central axis of the polish rod 9 is coincided with the central axis of the eccentric hole of the inner eccentric head 1; the oil pipe threaded connector 8 coincides with a central shaft of a wellhead. Further, the distance between the central axis of the eccentric hole of the outer eccentric sleeve 6 and the central axis of the wellhead is fixed to be 8 mm; the distance between the central axis of the polish rod 9 and the central axis of the eccentric hole of the outer eccentric sleeve 6 is fixed to be 8 mm; the distance between the central axis of the polish rod 9 and the central axis of the oil pipe threaded connector 8 is an offset distance; the two-dimensional section of the central axis of the polish rod 9, the central axis of the eccentric hole of the outer eccentric sleeve 6 and the central axis of the threaded connector 8 of the oil pipe forms a triangle, two sides of the triangle are fixed to be 8mm, the offset distance of the third side is variable, the offset distance is linearly variable, the offset range is larger than the difference absolute value of the two fixed sides and smaller than the sum absolute value of the two fixed sides, namely 0-16mm, when the polish rod 9 is offset in the working process, the radial force applied to a packing can be finally reflected on the inner eccentric head 1, at the moment, the inner eccentric head 1 rotates and follows with the outer eccentric sleeve 6, the inner angle of the triangle of the axis section and the relative position and distance between the central axis of the polish rod 9 and the central axis of a well head change along with the inner angle, the radial force disappears after the mechanism follows to the offset position of the polish.
Further, the oil pipe threaded connector 8 is compressed by the lower threaded compression ring 7 and is positioned by the lower positioning bolt 11; the inner eccentric head 1 is compressed by the upper threaded pressing ring 18 and is positioned through the upper positioning bolt 16, so that the function of preventing the pressing ring from loosening in the follow-up deviation adjusting process is realized.
Furthermore, an annular groove is formed in the lower part of the inner eccentric head 1 in a protruding mode along the circumferential direction, and an upper slip ring sealing ring 14 is installed; and an annular groove is formed in the upper part of the oil pipe threaded connector 8 in the circumferential direction in a protruding mode, and a lower sliding ring type sealing ring 12 is installed on the annular groove. The arrangement of the lower sliding ring type sealing ring 12 and the upper sliding ring type sealing ring 14 effectively improves the pressure resistance and the service life of the sealing, effectively reduces the friction resistance of rotating parts at the sealing position, contributes to improving the sensitivity and the precision of follow-up deviation adjustment, and reduces the residual radial deviation force caused by the friction force so as to realize more stable and higher pressure resistance.
Further, an outer eccentric sleeve rotating tool hole 4 is formed in the outer eccentric sleeve 6. The outer eccentric sleeve 6 is convenient to rotate. The upper threaded pressing ring 18 and the lower threaded pressing ring 7 are both provided with threaded pressing ring tool holes 2; the bolt fixing positions of the upper positioning bolt 16 and the lower positioning bolt 11 are respectively provided with an upper positioning bolt spring pad 17 and a lower positioning bolt spring pad 10.
To sum up, the upper eccentric hole of the outer eccentric sleeve is matched and connected with the inner eccentric head, the polished rod passes through the eccentric hole in the inner eccentric head, the outer eccentric sleeve can rotate around the oil pipe threaded joint by the central axis of the wellhead, the inner eccentric head can rotate around the central axis of the eccentric hole of the outer eccentric block, the oil pipe threaded joint and the inner eccentric head are respectively fixed by an upper threaded pressing ring and a lower threaded pressing ring, and a wellhead packing box assembly is matched above the inner eccentric head, so that a similar variable triangular double-connecting-rod structure of the central axis of the polished rod and the central axis of the wellhead in a radial two-dimensional dimension is realized, and the polished rod can automatically and stably adjust the deviation at any position within a radial 16mm range of the central axis of the; grooves are designed on the convex edges of the oil pipe threaded joint and the inner eccentric head, and a sliding ring type sealing ring is arranged in the grooves for sealing; relative rotation plane design ball group and holder between oil pipe screwed joint, outer eccentric cover, interior eccentric head and the upper and lower clamping ring to reduce the rotation resistance of automatic tuningout in-process, increase follow-up sensitivity and precision, effectively reduce the wearing and tearing of polished rod to the packing, this novel mechanism can follow the automatic tuningout of motion of polished rod, and simple structure, the installation that has significantly reduced and later maintenance time, improve the packing life-span, reduce the input of maintenance labour.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided would be apparent to those of skill in the art upon reading the above description. The scope of the invention should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of the subject matter that is disclosed herein is not intended to forego such subject matter, nor should the applicants be construed as having contemplated such subject matter as being part of the disclosed subject matter.
Claims (6)
1. A double eccentric follow-up deviation adjustment mechanism suitable for a wellhead packing box is characterized by comprising: an oil pipe threaded connector (8) arranged on a well mouth, an inner eccentric head (1) connected with a packing box, an outer eccentric sleeve (6) and a polish rod (9) penetrating through the oil pipe threaded connector (8), the inner eccentric head (1) and the outer eccentric sleeve (6); the oil pipe threaded connector (8) is arranged in a central hole at the lower end of the outer eccentric sleeve (6) and extends out of a part of the central hole; the inner eccentric head (1) is arranged in a central hole at the upper end of the outer eccentric sleeve (6) and extends out of a part of the central hole; the inner eccentric head (1) is compressed by an upper threaded compression ring (18); the oil pipe threaded connector (8) is compressed by the lower threaded compression ring (7); the upper end surface and the lower end surface of the oil pipe threaded connector (8) and the compression surface of the lower threaded compression ring (7) are both provided with annular spherical grooves, and the ball group (3) and the retainer (13) are mounted; the upper end face and the lower end face of the inner eccentric head (1) and the compression face of the upper threaded compression ring (18) are provided with annular spherical grooves, and the ball group (3) and the retainer (13) are mounted on the annular spherical grooves.
2. The double-eccentric follow-up deviation adjusting mechanism suitable for the wellhead packing box according to claim 1, wherein the oil pipe threaded connector (8) is compressed by a lower threaded compression ring (7) and positioned by a lower positioning bolt (11); the inner eccentric head (1) is pressed by an upper threaded pressing ring (18) and is positioned by an upper positioning bolt (16).
3. The double eccentric follow-up deviation adjusting mechanism suitable for the wellhead packing box according to the claim 1 or 2, characterized in that an annular groove is formed in the circumferential direction below the inner eccentric head (1) in a protruding mode, and an upper sliding ring sealing ring (14) is installed on the annular groove; an annular groove is formed in the upper part of the oil pipe threaded connector (8) in a protruding mode in the circumferential direction, and a lower sliding ring type sealing ring (12) is installed on the annular groove.
4. The double eccentric follower offset mechanism for wellhead packing box according to claim 3 characterized in that the inner eccentric head (1) central axis coincides with the outer eccentric sleeve (6) eccentric hole central axis, the polish rod (9) central axis coincides with the eccentric hole central axis of the inner eccentric head (1); the oil pipe threaded connector (8) is coincided with a central shaft of a wellhead.
5. The double-eccentric follow-up deviation adjusting mechanism suitable for the wellhead packing box according to claim 4, wherein the distance between the central axis of the eccentric hole of the outer eccentric sleeve (6) and the central axis of the wellhead is fixed to be 8 mm; the distance between the central axis of the polish rod (9) and the central axis of the eccentric hole of the outer eccentric sleeve (6) is fixed to be 8 mm; the distance between the central axis of the polish rod (9) and the central axis of the oil pipe threaded connector (8) is an offset distance; the two-dimensional sections of the central axis of the polish rod (9), the central axis of the eccentric hole of the outer eccentric sleeve (6) and the central axis of the threaded connector (8) of the oil pipe form a triangle.
6. The double eccentric follow-up deviation adjusting mechanism suitable for the wellhead packing box according to the claim 1, 2, 4 or 5, characterized in that the outer eccentric sleeve (6) is provided with an outer eccentric sleeve rotating tool hole (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020815052.5U CN212535579U (en) | 2020-05-16 | 2020-05-16 | Double-eccentric follow-up deviation adjusting mechanism suitable for wellhead packing box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020815052.5U CN212535579U (en) | 2020-05-16 | 2020-05-16 | Double-eccentric follow-up deviation adjusting mechanism suitable for wellhead packing box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212535579U true CN212535579U (en) | 2021-02-12 |
Family
ID=74542359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020815052.5U Expired - Fee Related CN212535579U (en) | 2020-05-16 | 2020-05-16 | Double-eccentric follow-up deviation adjusting mechanism suitable for wellhead packing box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212535579U (en) |
-
2020
- 2020-05-16 CN CN202020815052.5U patent/CN212535579U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209256256U (en) | A kind of adaptive pressure head structure of servo press angle | |
| CN212535579U (en) | Double-eccentric follow-up deviation adjusting mechanism suitable for wellhead packing box | |
| CN106872170B (en) | Magnitude of interference for bearing installation simulates fixture | |
| CN201507652U (en) | Floating seal structure of thrust shaft lever | |
| CN210014024U (en) | Novel plate valve | |
| CN108266152B (en) | Anti-eccentric packing box | |
| CN111287683A (en) | Wellhead polish rod sealing device of oil pumping machine | |
| CN109826970B (en) | Hidden rod flat valve without flange and bolt connection valve cover structure | |
| CN210423769U (en) | Plug valve for high-voltage high-frequency secondary occasion | |
| CN208845916U (en) | A kind of run-resistant assembling pipe joint | |
| CN219711481U (en) | Deviation-adjusting compensation polish rod sealer | |
| EP2300740B1 (en) | Sealing arrangement for cylindrical surfaces and a seal to be used in such sealing arrangements | |
| CN206099600U (en) | End cover compensation elastic sealing device | |
| CN219774799U (en) | Slide shoe shield sealing structure for cement mill | |
| CN216895800U (en) | Bidirectional soft sealing butterfly valve | |
| CN216478912U (en) | High-pressure sealing structure for rotation | |
| CN218207914U (en) | High-temperature wear-resistant eccentric half-ball valve with elastic memory function | |
| CN212377328U (en) | All-metal bidirectional sealing high-temperature butterfly valve | |
| CN111664158B (en) | Thread fixing quick connector and method for connecting quick connector and transmitter | |
| CN2750036Y (en) | Rod or shaft sealing device capable of regulating deflection abrasion | |
| JP4143786B2 (en) | Sealing device | |
| CN218564397U (en) | KL106U mechanical seal improved structure device | |
| CN212360781U (en) | Mechanical sealing element convenient to change sealing ring | |
| CN217123028U (en) | Precision valve internal part sealing assembly tool | |
| CN108730262B (en) | Self-adaptation formula ball pivot fixed knot who easily changes constructs |
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: 20210212 |