CN111336089A - Gas compressor capable of utilizing waste heat - Google Patents
Gas compressor capable of utilizing waste heat Download PDFInfo
- Publication number
- CN111336089A CN111336089A CN202010165622.5A CN202010165622A CN111336089A CN 111336089 A CN111336089 A CN 111336089A CN 202010165622 A CN202010165622 A CN 202010165622A CN 111336089 A CN111336089 A CN 111336089A
- Authority
- CN
- China
- Prior art keywords
- gas compressor
- input shaft
- speed increaser
- waste heat
- groove
- 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.)
- Withdrawn
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
Abstract
The invention discloses a gas compressor capable of utilizing waste heat, which structurally comprises a motor, a speed increaser, a gas compressor, a clutch, an expander, a circulation loop, a heat exchanger and a power-assisted structure, wherein the motor is connected with the speed increaser through the power-assisted structure, the speed increaser is connected with the gas compressor, the gas compressor is connected with the expander through the clutch, the gas compressor is connected with the heat exchanger through the heat circulation loop, the heat exchanger is connected with the expander through the circulation loop, the power-assisted structure comprises an input shaft, a spring, an output shaft and a magnetic push structure, and the input shaft is connected with the speed increaser, and the gas compressor has the advantages that: can carry out the helping hand to the start-up of speed increaser through the principle that magnet homopolar repulsion repelled to reduce the load that causes the motor when just starting, make the motor can drive the speed increaser rotation gradually, and carry out the transmission through spring and contactless mode and be connected, can reduce the vibration that the motor brought, prevent the not hard up of speed increaser.
Description
Technical Field
The invention relates to the field of petrochemical universal machinery, in particular to a gas compressor capable of utilizing waste heat.
Background
The gas compressor is a machine equipment for compressing gas into gas with certain pressure, and is a main body of a high-pressure gas source device, only 15% of electric energy consumed by the gas compressor is converted into internal energy of the compressed gas, and the remaining 85% of the electric energy can be converted into other forms of energy such as heat energy, sound energy and the like.
The existing gas compressor waste heat utilization device comprises a gas compressor, a heat exchanger, a turbine and a power machine, wherein a heat exchange circulation loop is arranged between the gas compressor and the heat exchanger, a working medium work-doing circulation loop is arranged between the heat exchanger and the turbine, the power machine drives the gas compressor to do work in a shaft transmission mode, the turbine directly drives the gas compressor or the power machine through a transmission shaft, a clutch is arranged on an output shaft of the turbine, the output shaft of the turbine is connected with the clutch, the turbine and the gas compressor can be combined or separated in a transmission mode according to actual conditions through the clutch, the condition that the turbine takes the power machine as a load is avoided, but in the prior art, a speed increaser is adopted to meet different rotating speed requirements of the motor and the gas compressor, but the speed increaser needs to be larger than the load of, therefore, the motor is easily damaged in a hard manner during starting, and the vibration generated by the operation of the motor drives the speed increaser to vibrate therewith, so that the speed increaser is loosened.
Disclosure of Invention
The main purpose of the present invention is to overcome the disadvantages of the prior art and to provide a gas compressor capable of utilizing waste heat.
The invention is realized by adopting the following technical scheme: the utility model provides a but waste heat utilization's gas compressor, its structure includes motor, speed increaser, gas compressor, clutch, expander, circulation circuit, heat exchanger, helping hand structure, the motor is connected with the speed increaser through helping hand structure, the speed increaser is connected with gas compressor, gas compressor is connected with the expander through the clutch, gas compressor is connected with the heat exchanger through hot circulation circuit, the heat exchanger is connected with the expander through circulation circuit, the helping hand structure includes input shaft, spring, output shaft, magnetic propulsion structure, the input shaft is connected with the speed increaser, the output shaft is connected with the motor, be equipped with the spring between input shaft and the output shaft, the input shaft side is equipped with the magnetic propulsion structure.
Preferably, the magnetic pushing structure comprises a movable magnet, a telescopic rod and an electromagnet, wherein the movable magnet is arranged above the electromagnet and is connected with the electromagnet through the telescopic rod.
Preferably, the output shaft comprises a shaft body, a push block and a circular truncated cone, the circular truncated cone is arranged at one end, facing the input shaft, of the shaft body, the push block is evenly distributed on the outer side of the circular truncated cone, and the shaft body, the push block and the circular truncated cone are of an integrated structure.
As optimization, the input shaft comprises an input shaft body, a groove and a bump, wherein a circular groove is formed in one end, close to the output shaft, of the input shaft body, and the bumps are uniformly distributed in the groove.
Preferably, a movable groove is formed in the side face of the input shaft, and a rotating structure is installed in the movable groove.
As optimization, revolution mechanic includes rotator, fixed knot structure, the rotator is installed inside the activity inslot, the activity inslot portion is equipped with the mounting groove, installs fixed knot structure in this mounting groove, fixed knot structure and rotator cooperate.
As optimization, the rotator includes pivot, long board, clip, spacing angle, long board one end is installed at the activity inslot through the pivot, long board other end inboard is equipped with the clip, the spacing angle is connected with the one end that the long board was equipped with the pivot.
Preferably, the fixing structure comprises a fixing shaft, a special-shaped hook and a spring, the special-shaped hook is sleeved on the fixing shaft, the fixing shaft is fixed in the movable groove, one end of the spring is connected to the mounting groove, and the other end of the spring is connected with the special-shaped hook.
Preferably, the diameter of the circular truncated cone is half of that of the shaft body.
Preferably, a stop block is arranged on the side surface of the input shaft.
Preferably, the bottom of the movable magnet and the top of the electromagnet are homopolar.
Advantageous effects
When the electromagnetic shielding device is used, the motor is started to rotate, the electromagnet is powered on, when the motor drives the input shaft through the output shaft, the electromagnet pushes the movable magnet to push upwards through the principle that like poles repel, the movable magnet pushes the upper long plate to assist the output shaft, when the long plate rotates to the other side, the long plate meets the stop block and is pushed inwards by the stop block, when the long plate rotates inwards, the hook pushes the special-shaped hook upwards, when the hook moves to the inner side of the special-shaped hook, the special-shaped hook moves downwards under the action of the spring to hook the hook, the long plate is kept in an inwards contracted state, continuous scraping on the electromagnet is prevented, and because the push block is connected with the convex block through the spring and does not contact with the input shaft, the vibration brought by the motor can be avoided.
Compared with the prior art, the invention has the beneficial effects that: can carry out the helping hand to the start-up of speed increaser through the principle that magnet homopolar repulsion repelled to reduce the load that causes the motor when just starting, make the motor can drive the speed increaser rotation gradually, and carry out the transmission through spring and contactless mode and be connected, can reduce the vibration that the motor brought, prevent the not hard up of speed increaser.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic structural diagram of a gas compressor capable of utilizing waste heat according to the present invention.
Fig. 2 is a schematic structural diagram of the boosting structure of the invention.
Fig. 3 is a schematic structural diagram of an output shaft of the present invention.
Fig. 4 is a schematic structural view of an input shaft of the present invention.
Fig. 5 is a schematic view of the internal structure of the movable chute of the present invention.
Fig. 6 is a schematic structural diagram of a rotary structure according to the present invention.
Fig. 7 is an enlarged schematic view of a portion of fig. 5A.
In the figure: the device comprises a motor 1, a speed increaser 2, a gas compressor 3, a clutch 4, an expander 5, a circulation circuit 6, a heat exchanger 7, a boosting structure 8, an input shaft 80, a spring 81, an output shaft 82, a magnetic pushing structure 83, a movable magnet 83a, an expansion link 83b, an electromagnet 83c, a shaft body 82a, a push block 82b, a circular truncated cone 82c, an input shaft body 80a, a groove 80b, a convex block 80c, a movable groove 80d, a rotating structure 80e, a rotating body e1, a fixed structure e2, a rotating shaft e10, a long plate e11, a clasp e12, a limit angle e13, a fixed shaft e20, a special-shaped hook 21 and a spring e 22.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1-2 and 5-7, the present invention provides a gas compressor capable of utilizing waste heat: the structure of the gas booster comprises a motor 1, a speed increaser 2, a gas compressor 3, a clutch 4, an expander 5, a circulation loop 6, a heat exchanger 7 and a power assisting structure 8, wherein the motor 1 is connected with the speed increaser 2 through the power assisting structure 8, the speed increaser 2 is connected with the gas compressor 3, the gas compressor 3 is connected with the expander 5 through the clutch 4, the gas compressor 3 is connected with the heat exchanger 7 through a thermal circulation loop, the heat exchanger 7 is connected with the expander 5 through the circulation loop 6, the power assisting structure 8 comprises an input shaft 80, a spring 81, an output shaft 82 and a magnetic pushing structure 83, the input shaft 80 is connected with the speed increaser 2, the output shaft 82 is connected with the motor 1, the spring 81 is arranged between the input shaft 80 and the output shaft 82, the magnetic pushing structure 83 is arranged on the side surface of the input shaft 80, and the magnetic pushing structure 83, The telescopic rod 83b and the electromagnet 83c, the movable magnet 83a is arranged above the electromagnet 83c and connected with the electromagnet 83c through the telescopic rod 83b, the telescopic rod 83b can ensure that the movable magnet 83a vertically moves, the side surface of the input shaft 80 is provided with a movable groove 80d, a rotating structure 80e is arranged in the movable groove 80d, the rotating structure 80e comprises a rotating body e1 and a fixed structure e2, the rotating body e1 is arranged in the movable groove 80d, an installation groove is arranged in the movable groove 80d, a fixed structure e2 is arranged in the installation groove, the fixed structure e2 is matched with the rotating body e1, the rotating body e1 comprises a rotating shaft e10, a long plate e11, a clasp e12 and a limit angle e13, one end of the long plate e11 is arranged in the movable groove 80d through the rotating shaft e10, the inner side of the other end of the long plate e11 is provided with the clasp e12, the limit angle e13 is connected with one end of the long plate 11 provided, the limiting angle e13 can make the long plate e11 open a certain angle to limit the open angle of the long plate e11, the fixed structure e2 comprises a fixed shaft e20, a special-shaped hook e21 and a spring e22, the special-shaped hook e21 is sleeved on the fixed shaft e20, the fixed shaft e20 is fixed in the movable groove 80d, one end of the spring e22 is connected to the installation groove, the other end of the spring e22 is connected with the special-shaped hook e21, the spring e22 can keep continuous power to push the special-shaped hook e21 upwards, a stopper is arranged on the side face of the input shaft 80 and can push the long plate e11 inwards, the bottom of the movable magnet 83a and the top of the electromagnet 83c are homopolar, homopolar repulsion is generated, and the electromagnet 83c repels the movable magnet 83 a.
The working principle is as follows: when the motor 1 is started to rotate, the electromagnet 83c is powered on, so that when the motor 1 drives the input shaft 80 through the output shaft 82, the electromagnet 83c pushes the movable magnet 83a to push upwards through the principle that like poles repel, the movable magnet 83a pushes the upward long plate e11 to assist the output shaft 82, when the long plate e11 rotates to the other side and meets a stop, the long plate e11 is pushed inwards, when the long plate e11 rotates inwards, the hook e12 pushes the special-shaped hook e21 upwards, and when the hook e12 moves to the inside of the special-shaped hook e21, the special-shaped hook e21 moves downwards under the action of the spring e22 to hook the hook e12, so that the long plate e11 keeps a inwards retracted state, and the electromagnet 83c is prevented from being continuously scratched.
Example 2
Referring to fig. 1-4, the present invention provides a gas compressor capable of utilizing waste heat, which comprises: the gas compressor heat pump system structurally comprises a motor 1, a speed increaser 2, a gas compressor 3, a clutch 4, an expander 5, a circulation loop 6, a heat exchanger 7 and a power assisting structure 8, wherein the motor 1 is connected with the speed increaser 2 through the power assisting structure 8, the speed increaser 2 is connected with the gas compressor 3, the gas compressor 3 is connected with the expander 5 through the clutch 4, the gas compressor 3 is connected with the heat exchanger 7 through a heat circulation loop, the heat exchanger 7 is connected with the expander 5 through the circulation loop 6, the power assisting structure 8 comprises an input shaft 80, a spring 81, an output shaft 82 and a magnetic pushing structure 83, the input shaft 80 is connected with the speed increaser 2, the output shaft 82 is connected with the motor 1, the spring 81 is arranged between the input shaft 80 and the output shaft 82, the magnetic pushing structure 83 is arranged on the side surface of the input shaft 80, and the magnetic pushing structure 83, The output shaft 82 comprises a shaft body 82a, a pushing block 82b and a circular table 82c, one end of the shaft body 82a facing the input shaft 80 is provided with the circular table 82c, the outer side of the circular table 82c is provided with 3 pushing blocks 82b which are uniformly distributed, the shaft body 82a, the pushing block 82b and the circular table 82c are of an integrated structure, the input shaft 80 comprises an input shaft body 80a, a groove 80b and a convex block 80c, one end of the input shaft body 80a, close to the output shaft 82, is provided with a circular groove 80b, the groove 80b is internally provided with 3 convex blocks 80c which are uniformly distributed, and the contact between the output shaft 82 and the input shaft 80 can be improved through the matching of the 3 convex blocks 80c and the 3 pushing blocks 82b Strength, and at the same time, the two are not in direct contact, reducing the vibration connection between the two.
The working principle is as follows: in use, since the push block 82b is connected to the projection 80c by the spring e22, and the push block 82b does not contact the input shaft 80, vibration caused by the motor 1 can be prevented.
Compared with the prior art, the invention has the technical progress that: can carry out the helping hand to the start-up of speed increaser through the principle that magnet homopolar repulsion repelled to reduce the load that causes the motor when just starting, make the motor can drive the speed increaser rotation gradually, and carry out the transmission through spring and contactless mode and be connected, can reduce the vibration that the motor brought, prevent the not hard up of speed increaser.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (8)
1. A gas compressor capable of utilizing waste heat structurally comprises a motor (1), a speed increaser (2), a gas compressor (3), a clutch (4), an expander (5), a circulation loop (6), a heat exchanger (7) and a power assisting structure (8), wherein the motor (1) is connected with the speed increaser (2) through the power assisting structure (8), the speed increaser (2) is connected with the gas compressor (3), the gas compressor (3) is connected with the expander (5) through the clutch (4), the gas compressor (3) is connected with the heat exchanger (7) through a thermal circulation loop, and the heat exchanger (7) is connected with the expander (5) through the circulation loop (6), and is characterized in that:
the booster structure (8) comprises an input shaft (80), a spring (81), an output shaft (82) and a magnetic pushing structure (83), the input shaft (80) is connected with the speed increaser (2), the output shaft (82) is connected with the motor (1), the spring (81) is arranged between the input shaft (80) and the output shaft (82), and the magnetic pushing structure (83) is arranged on the side surface of the input shaft (80).
2. The waste heat utilizable gas compressor according to claim 1, wherein: the magnetic pushing structure (83) comprises a movable magnet (83a), an expansion link (83b) and an electromagnet (83c), wherein the movable magnet (83a) is arranged above the electromagnet (83c) and is connected with the electromagnet (83c) through the expansion link (83 b).
3. The waste heat utilizable gas compressor according to claim 1, wherein: the output shaft (82) comprises a shaft body (82a), a pushing block (82b) and a circular truncated cone (82c), wherein the circular truncated cone (82c) is arranged at one end, facing the input shaft (80), of the shaft body (82a), 3 pushing blocks (82b) which are uniformly distributed are arranged on the outer side of the circular truncated cone (82c), and the shaft body (82a), the pushing block (82b) and the circular truncated cone (82c) are of an integrated structure.
4. The waste heat utilizable gas compressor according to claim 1, wherein: the input shaft (80) comprises an input shaft body (80a), a groove (80b) and a bump (80c), wherein a circular groove (80b) is formed in one end, close to the output shaft (82), of the input shaft body (80a), and 3 bumps (80c) are uniformly distributed in the groove (80 b).
5. The waste heat utilizable gas compressor according to claim 1, wherein: the side surface of the input shaft (80) is provided with a movable groove (80d), and a rotating structure (80e) is arranged in the movable groove (80 d).
6. The waste heat utilizable gas compressor according to claim 5, wherein: revolution mechanic (80e) include rotator (e1), fixed knot constructs (e2), install inside activity groove (80d) rotator (e1), activity groove (80d) inside is equipped with the mounting groove, installs fixed knot structure (e2) in this mounting groove, fixed knot constructs (e2) and cooperatees with rotator (e 1).
7. The waste heat utilizable gas compressor according to claim 6, wherein: rotator (e1) includes pivot (e10), long board (e11), clip (e12), spacing angle (e13), install in activity groove (80d) through pivot (e10) long board (e11) one end, long board (e11) other end inboard is equipped with clip (e12), spacing angle (e13) is connected with the one end that long board (e11) were equipped with pivot (e 10).
8. The waste heat utilizable gas compressor according to claim 6, wherein: fixed knot constructs (e2) and includes fixed axle (e20), dysmorphism hook (e21), spring (e22), fixed axle (e20) is established in dysmorphism hook (e21) cover, fixed axle (e20) are fixed in activity groove (80d), spring (e22) one end is connected in the mounting groove, spring (e22) other end is connected with dysmorphism hook (e 21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010165622.5A CN111336089A (en) | 2020-03-11 | 2020-03-11 | Gas compressor capable of utilizing waste heat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010165622.5A CN111336089A (en) | 2020-03-11 | 2020-03-11 | Gas compressor capable of utilizing waste heat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111336089A true CN111336089A (en) | 2020-06-26 |
Family
ID=71184367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010165622.5A Withdrawn CN111336089A (en) | 2020-03-11 | 2020-03-11 | Gas compressor capable of utilizing waste heat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111336089A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB361433A (en) * | 1930-08-26 | 1931-11-26 | Arthur Lowndes | An improved centrifugal clutch |
| CN103457408A (en) * | 2012-06-04 | 2013-12-18 | 蔡旭阳 | Buffered variable speed motor |
| CN105896814A (en) * | 2014-12-20 | 2016-08-24 | 蔡贵席 | Double-claw variable speed motor |
| CN106762647A (en) * | 2016-12-30 | 2017-05-31 | 温岭市鑫磊空压机有限公司 | A kind of UTILIZATION OF VESIDUAL HEAT IN energy-saving air compressor |
| CN207960892U (en) * | 2018-03-15 | 2018-10-12 | 开封中化换热设备有限公司 | A kind of gas compressor waste heat utilization device |
| CN109899469A (en) * | 2019-04-23 | 2019-06-18 | 吉林博承传动系统科技有限公司 | A kind of planet gear type power failure-free two keeps off gearbox and its shift control method |
-
2020
- 2020-03-11 CN CN202010165622.5A patent/CN111336089A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB361433A (en) * | 1930-08-26 | 1931-11-26 | Arthur Lowndes | An improved centrifugal clutch |
| CN103457408A (en) * | 2012-06-04 | 2013-12-18 | 蔡旭阳 | Buffered variable speed motor |
| CN105896814A (en) * | 2014-12-20 | 2016-08-24 | 蔡贵席 | Double-claw variable speed motor |
| CN106762647A (en) * | 2016-12-30 | 2017-05-31 | 温岭市鑫磊空压机有限公司 | A kind of UTILIZATION OF VESIDUAL HEAT IN energy-saving air compressor |
| CN207960892U (en) * | 2018-03-15 | 2018-10-12 | 开封中化换热设备有限公司 | A kind of gas compressor waste heat utilization device |
| CN109899469A (en) * | 2019-04-23 | 2019-06-18 | 吉林博承传动系统科技有限公司 | A kind of planet gear type power failure-free two keeps off gearbox and its shift control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202172357U (en) | Intelligent protective type disc electromagnetic coupling | |
| CN111336089A (en) | Gas compressor capable of utilizing waste heat | |
| CN210565909U (en) | Brake device of wind driven generator | |
| CN103511573A (en) | Device converting circular rotation to linear reciprocating motion | |
| CN116581893A (en) | Electric fracturing energy storage system | |
| CN202132407U (en) | Energy-storage buffering coupling | |
| CN202007841U (en) | Clutch | |
| CN205453456U (en) | Permanent magnetism eddy current coupling for beam -pumping unit | |
| CN204061792U (en) | A kind of dydraudynamic drive unit | |
| CN204290659U (en) | Single copper ring formula permanent magnet clutch | |
| CN203362886U (en) | Electromagnetic force obtaining clutch structure | |
| CN215344165U (en) | Brake motor integrated special casing with brake manual operation rod fixing device | |
| CN101414769A (en) | Energy-saving motor for rapier loom | |
| CN208479333U (en) | A kind of low energy consumption outer rotor bullet train blower electricity consumption machine | |
| CN204179922U (en) | Double copper ring formula permanent magnet clutch | |
| CN201034082Y (en) | Mechanical ventilator transmission type water pump system | |
| CN203398976U (en) | Mushroomed permanent magnetic coupler | |
| CN208295076U (en) | A kind of twin-turbine torque converter machine core | |
| CN208221139U (en) | A kind of low windage direct-drive type blower | |
| CN218030316U (en) | Convenient steam turbine chassis of dismantling | |
| CN206811641U (en) | A kind of transmitting device of steel segment with polishing function | |
| CN214170661U (en) | Locking device of speed governing water pump, water pump and vehicle | |
| CN2433293Y (en) | Roller vibration roller with shield | |
| CN217605902U (en) | Generator performance detection platform | |
| CN201250862Y (en) | Fiction coupling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200626 |
|
| WW01 | Invention patent application withdrawn after publication |