CN111102581A - Air inlet device of combustible waste heat recovery system - Google Patents
Air inlet device of combustible waste heat recovery system Download PDFInfo
- Publication number
- CN111102581A CN111102581A CN202010040571.3A CN202010040571A CN111102581A CN 111102581 A CN111102581 A CN 111102581A CN 202010040571 A CN202010040571 A CN 202010040571A CN 111102581 A CN111102581 A CN 111102581A
- Authority
- CN
- China
- Prior art keywords
- air
- pipe
- air inlet
- wall
- nozzle
- 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- Withdrawn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
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/20—Waste heat recuperation using the heat in association with another installation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Supply (AREA)
Abstract
The invention relates to an air inlet device of a combustible waste heat recovery system, which comprises an air pipe body, wherein an air inlet pipe and an air outlet pipe are respectively arranged at two ends of the air pipe body, an air injection assembly is arranged in an inner cavity of the air outlet pipe and comprises an outer nozzle and an inner nozzle, the outer nozzle comprises a circular flow guide cover and a circular flow guide cover, a first air flow channel is formed between the flow guide cover and the inner wall of the air outlet pipe, the flow guide cover is positioned at the other end of the flow guide cover, and one end of the flow guide cover is close to the outer wall of the flow guide cover and forms a first; a second air flow channel is arranged in the inner cavity of the inner nozzle, a second air exhaust port is arranged on the inner ring of the inner nozzle, and an air delivery pipe is connected between the inner nozzle and the outer nozzle; the outer wall of the air outlet pipe is provided with a fan seat, an air inlet cavity is arranged in the fan seat, the lower end of the air inlet cavity is communicated with the first air flow channel, a fan cover is arranged in the air inlet cavity, a fan is arranged in the fan cover, and an impeller for generating air flow is arranged on an output shaft of the fan. Quickening the transportation of the flue gas and reducing the loss of the heat of the flue gas.
Description
Technical Field
The invention belongs to the technical field of heat recovery devices, and particularly relates to an air inlet device of a combustible waste heat recovery system.
Background
At present, a plurality of combustible wastes are generated in the industrial processing and production process, the combustible wastes are generally treated in an incineration mode, and the wastes generate a large amount of heat during combustion, and the heat is wasted along with the emission of flue gas, so that a heat recovery system is needed for carrying out heat recovery treatment on the high-temperature flue gas. The air intake device in the existing heat recovery system usually adopts a mode of installing a fan in a smoke exhaust pipeline to accelerate the flow rate of smoke, thereby preventing the heat of the flue gas from losing in the pipeline, and the temperature of the high-temperature flue gas can reach two hundred degrees centigrade, the fan blades are deformed under such a high temperature environment, and the service life of the fan motor is greatly shortened when the fan motor is operated under a high load condition, moreover, the existing smoke exhaust pipeline is always communicated with the combustion furnace, so that part of heat can directly flow into the heat recovery device from the smoke exhaust pipeline in the primary combustion process of the combustion furnace, thereby leading the temperature in the combustion furnace to be unable to reach the maximum value, and at the moment, the heat recovery device has common heat recovery effect due to lower temperature of the flue gas, and the heat recovery device also consumes certain energy in the operation process, thus, a certain cost is also increased, and an air intake device is needed to ensure the efficient operation of the heat recovery system.
Disclosure of Invention
Aiming at the problems, the invention discloses an air inlet device of a combustible waste heat recovery system, which effectively solves the problem that high-temperature smoke gas has influence on the service life of a fan and a motor.
The specific technical scheme is as follows:
an air inlet device of a combustible waste heat recovery system comprises an air pipe body, wherein an air inlet pipe and an air outlet pipe are respectively arranged at two ends of the air pipe body, a mounting seat is arranged on the outer wall of the air inlet pipe, a partition plate is horizontally arranged in the mounting seat, a servo motor is arranged above the partition plate, a circle of limiting ring is arranged on the inner wall of the air inlet pipe, four rotating seats are arranged at the upper end and the lower end of the inner wall of the air inlet pipe, the rotating seats are symmetrically distributed in pairs and are arranged between every two adjacent rotating seats in a laminating manner, the rotating seats are arranged at one side of the limiting ring in a laminating manner, rotating columns are arranged between the rotating seats at the upper end and the lower end of the air inlet pipe in a rotating manner, the rotating columns are arranged in the middle of the air inlet pipe and are longitudinally provided with semicircular sealing plates, the two sealing plates are symmetrically arranged and are in a circular structure, and the top ends of the two rotating columns, the two gears are in meshed connection, and one rotating column penetrates through the partition plate and is fixedly connected with an output shaft of the servo motor;
the inner cavity of the air outlet pipe is internally provided with an air injection assembly, the air injection assembly comprises an outer nozzle and an inner nozzle, the outer nozzle comprises a circular air guide sleeve and a drainage cover, one end of the drainage cover is fixedly connected with the inner wall of the air outlet pipe, the other end of the drainage cover extends towards one side, a circular first air flow channel is formed between the drainage cover and the inner wall of the air outlet pipe, the air guide sleeve is of an arc structure and is positioned at the other end of the drainage cover, one end of the air guide sleeve is fixedly connected with the inner wall of the air outlet pipe, and the other end of the air guide sleeve is close to the outer wall of the drainage cover and forms a circular first exhaust; the inner nozzle is of a hollow circular ring structure, a second air flow channel is arranged in the inner cavity of the inner nozzle, a second air exhaust port is arranged on the inner ring of the inner nozzle, the structure of the second air exhaust port is the same as that of the first air exhaust port, the inner nozzle is arranged on the inner ring of the outer nozzle, a gas pipe is connected between the inner nozzle and the outer nozzle, one end of the gas pipe is fixedly connected with the outer wall of the drainage cover and communicated with the first air flow channel, and the other end of the gas pipe is fixedly connected with the outer wall of the inner nozzle and communicated with the second air flow channel; the air outlet pipe is characterized in that a fan seat is arranged on the outer wall of the air outlet pipe, an air inlet is formed in the upper end of the fan seat, an air inlet cavity is formed in the fan seat, the air inlet cavity is of a structure with a wide middle and narrow two ends, the lower end of the air inlet cavity penetrates through the side wall of the air outlet pipe and is communicated with the first air flow channel, a fan cover is arranged in the air inlet cavity, a fan is arranged in the fan cover, and an impeller used for generating air flow is arranged on an output shaft.
Furthermore, the opening size of the air inlet pipe is larger than that of the air outlet pipe.
Furthermore, both ends of the gas transmission pipe are obliquely connected with the inner nozzle and the outer nozzle.
Further, the diameter of the closing plate is larger than the inner diameter of the limiting ring.
Furthermore, a metal filter screen is arranged at the air inlet.
Furthermore, the number of the gas conveying pipes is four.
The invention has the beneficial effects that:
(1) according to the invention, the air inlet pipe is internally provided with the two semicircular closing plates, one rotating column is driven to rotate by the servo motor, and the other rotating column rotates along with the rotation of the servo motor through the matching of the two gears, so that the opening and closing of the two closing plates are realized, the heat in the combustion furnace during primary combustion cannot be lost, and the efficient operation of a heat recovery system is ensured.
(2) The air outlet pipe is provided with the air injection assembly, the impeller is driven to rotate at a high speed by the fan in the fan base, the air flow is guided into the first air flow channel of the outer nozzle and then discharged through the first air outlet, meanwhile, the air flow in the first air flow channel enters the second air flow channel in the inner nozzle through the air conveying pipe and is discharged from the second air outlet, the air pressure in the air outlet pipe can be reduced, therefore, the gas in the combustion furnace can be quickly conveyed into the heat recovery system through the air pipe body, the air inlet effect is better, the conveying of high-temperature flue gas is greatly accelerated, and the loss of heat of the flue gas is reduced.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a cross-sectional view of the present invention.
Figure 3 is a side view of the present invention,
description of the reference numerals
The air duct comprises an air duct body 1, an air inlet duct 2, a mounting seat 21, a partition 211, a servo motor 212, a limiting ring 22, a rotating seat 23, a rotating column 24, a sealing plate 25, a gear 26, an air outlet duct 3, a fan seat 31, an air inlet 311, a metal filter screen 312, an air inlet cavity 313, a fan cover 314, a fan 315, an impeller 316, an air injection assembly 4, an outer nozzle 41, a flow guide cover 411, a flow guide cover 412, a first air flow passage 413, a first air outlet 414, an inner nozzle 42, a second air flow passage 421, a second air outlet 422 and an air delivery pipe 43.
Detailed Description
In order to make the technical scheme of the invention clearer and clearer, the invention is further described with reference to the accompanying drawings, and any scheme obtained by carrying out equivalent replacement and conventional reasoning on the technical characteristics of the technical scheme of the invention falls into the protection scope of the invention. The fixing and the arrangement of the fixing and the connection are all general connection modes in the mechanical field, and the fixing and the connection can be performed by welding, bolt and nut connection and screw connection.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
An air inlet device of a combustible waste heat recovery system comprises an air pipe body, wherein an air inlet pipe and an air outlet pipe are respectively arranged at two ends of the air pipe body, the air inlet pipe is connected with a smoke outlet of a combustion furnace, a mounting seat is arranged on the outer wall of the air inlet pipe, a partition plate is horizontally arranged in the mounting seat, a servo motor is arranged above the partition plate, a circle of limiting ring is arranged on the inner wall of the air inlet pipe, four rotating seats are arranged at the upper end and the lower end of the inner wall of the air inlet pipe, the rotating seats are symmetrically distributed in pairs and are attached to each other between two adjacent rotating seats, the rotating seats are attached to one side of the limiting ring, a rotating column is rotatably arranged between the rotating seats at the upper end and the lower end of the air inlet pipe and is positioned in the middle of the air inlet pipe, semicircular sealing plates are longitudinally arranged on the two rotating columns, and are symmetrically arranged between, the top ends of the two rotary columns penetrate through the side wall of the air pipe body and the mounting seat and are provided with gears, the two gears are meshed and connected, one rotary column penetrates through the partition plate and is fixedly connected with an output shaft of the servo motor, the servo motor drives one rotary column to rotate, and the other rotary column is driven to rotate under the matching of the two gears, so that the two rotary columns rotate by 90 degrees, and the two sealing plates are attached;
the air outlet pipe is connected with a heat recovery system through a pipeline, an air injection assembly is arranged in an inner cavity of the air outlet pipe, the air injection assembly comprises an outer nozzle and an inner nozzle, the outer nozzle comprises a circular diversion cover and a drainage cover, one end of the drainage cover is fixedly connected with the inner wall of the air outlet pipe, the other end of the drainage cover extends towards one side, a circular first air flow channel is formed between the drainage cover and the inner wall of the air outlet pipe, the diversion cover is of an arc structure and is located at the other end of the drainage cover, one end of the diversion cover is fixedly connected with the inner wall of the air outlet pipe, and the other end of the diversion cover is close to the outer wall of the drainage cover and forms a circular first exhaust; the inner nozzle is of a hollow circular ring structure, a second air flow channel is arranged in the inner cavity of the inner nozzle, a second air exhaust port is arranged on the inner ring of the inner nozzle, the structure of the second air exhaust port is the same as that of the first air exhaust port, the inner nozzle is arranged on the inner ring of the outer nozzle, a gas pipe is connected between the inner nozzle and the outer nozzle, one end of the gas pipe is fixedly connected with the outer wall of the drainage cover and communicated with the first air flow channel, and the other end of the gas pipe is fixedly connected with the outer wall of the inner nozzle and communicated with the second air flow channel; the air outlet pipe is characterized in that a fan seat is arranged on the outer wall of the air outlet pipe, an air inlet is formed in the upper end of the fan seat, an air inlet cavity is formed in the fan seat, the air inlet cavity is of a structure with a wide middle and narrow two ends, the lower end of the air inlet cavity penetrates through the side wall of the air outlet pipe and is communicated with the first air flow channel, a fan cover is arranged in the air inlet cavity, a fan is arranged in the fan cover, and an impeller used for generating air flow is arranged on an output shaft.
Furthermore, the opening size of the air inlet pipe is larger than that of the air outlet pipe.
Furthermore, both ends of the gas transmission pipe are obliquely connected with the inner nozzle and the outer nozzle.
Further, the diameter of the closing plate is larger than the inner diameter of the limiting ring.
Furthermore, a metal filter screen is arranged at the air inlet.
Furthermore, the number of the gas conveying pipes is four.
The working principle of the invention is as follows:
when the rotary column switching mechanism works, one rotary column is driven to rotate through the servo motor, the other rotary column rotates along with the other rotary column through the matching between the two gears, so that the two rotary columns rotate 90 degrees, the two sealing plates are attached to each other, and the switching between the two sealing plates is realized. The fan in the fan base drives the impeller to rotate at a high speed, external airflow is guided into the first airflow channel of the outer nozzle and then discharged through the first exhaust port, meanwhile, airflow in the first airflow channel enters the second airflow channel of the inner nozzle through the air delivery pipe and is discharged from the second exhaust port, the air pressure in the air outlet pipe can be reduced, and therefore gas in the combustion furnace can be conveyed into the heat recovery system through the air pipe body quickly.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. An air inlet device of a combustible waste heat recovery system comprises an air pipe body and is characterized in that an air inlet pipe and an air outlet pipe are respectively arranged at two ends of the air pipe body, a mounting seat is arranged on the outer wall of the air inlet pipe, a partition plate is horizontally arranged in the mounting seat, a servo motor is arranged above the partition plate, a circle of limiting ring is arranged on the inner wall of the air inlet pipe, four rotating seats are arranged at the upper end and the lower end of the inner wall of the air inlet pipe, the rotating seats are symmetrically distributed in pairs and are attached to each other, the rotating seats are attached to one side of the limiting ring and are arranged on the two adjacent rotating seats, a rotating column is rotatably arranged between the rotating seats at the upper end and the lower end of the air inlet pipe and is arranged in the middle of the air inlet pipe, semicircular sealing plates are longitudinally arranged on the two rotating columns, and are symmetrically arranged and are of a circular, the top ends of the two rotary columns penetrate through the side wall of the air pipe body and the mounting seat and are provided with gears, the two gears are meshed and connected, and one rotary column penetrates through the partition plate and is fixedly connected with an output shaft of the servo motor; an air injection assembly is arranged in an inner cavity of the air outlet pipe, the air injection assembly comprises an outer nozzle and an inner nozzle, the outer nozzle comprises a circular diversion cover and a circular drainage cover, one end of the drainage cover is fixedly connected with the inner wall of the air outlet pipe, a circular first air flow channel is formed between the drainage cover and the inner wall of the air outlet pipe, the diversion cover is of an arc-shaped structure and is positioned at the other end of the drainage cover, one end of the diversion cover is fixedly connected with the inner wall of the air outlet pipe, and the other end of the diversion cover and the outer wall of the drainage cover are arranged close to each other to form a circular first exhaust port; the inner nozzle is of a hollow circular ring structure, a second air flow channel is arranged in the inner cavity of the inner nozzle, a second air exhaust port is arranged on the inner ring of the inner nozzle, the structure of the second air exhaust port is the same as that of the first air exhaust port, the inner nozzle is arranged on the inner ring of the outer nozzle, a gas pipe is connected between the inner nozzle and the outer nozzle, one end of the gas pipe is fixedly connected with the outer wall of the drainage cover and communicated with the first air flow channel, and the other end of the gas pipe is fixedly connected with the outer wall of the inner nozzle and communicated with the second air flow channel; the air outlet device is characterized in that a fan seat is arranged on the outer wall of the air outlet pipe, an air inlet is formed in the upper end of the fan seat, an air inlet cavity is formed in the fan seat, the lower end of the air inlet cavity penetrates through the side wall of the air outlet pipe and is communicated with the first airflow channel, a fan cover is arranged in the air inlet cavity, a fan is arranged in the fan cover, and an impeller used for generating airflow is arranged on an output shaft of the fan.
2. The air intake device of a combustible waste heat recovery system according to claim 1, wherein the opening size of the air intake pipe is larger than the opening size of the air outlet pipe.
3. The air intake device of the combustible waste heat recovery system of claim 1, wherein both ends of the air delivery pipe are obliquely connected with the inner nozzle and the outer nozzle.
4. The air intake apparatus of a combustible waste heat recovery system of claim 1, wherein the diameter of the closing plate is larger than the inner diameter of the retainer ring.
5. The air intake device of the combustible waste heat recovery system according to claim 1, wherein a metal filter screen is provided at the air intake.
6. The air intake device of the combustible waste heat recovery system of claim 1, wherein the number of the air delivery pipes is four.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010040571.3A CN111102581A (en) | 2020-01-15 | 2020-01-15 | Air inlet device of combustible waste heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010040571.3A CN111102581A (en) | 2020-01-15 | 2020-01-15 | Air inlet device of combustible waste heat recovery system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111102581A true CN111102581A (en) | 2020-05-05 |
Family
ID=70426240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010040571.3A Withdrawn CN111102581A (en) | 2020-01-15 | 2020-01-15 | Air inlet device of combustible waste heat recovery system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111102581A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728850A (en) * | 2020-12-24 | 2021-04-30 | 武汉巨力鼎兴冷链股份有限公司 | Refrigeration system and method for refrigeration house |
-
2020
- 2020-01-15 CN CN202010040571.3A patent/CN111102581A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728850A (en) * | 2020-12-24 | 2021-04-30 | 武汉巨力鼎兴冷链股份有限公司 | Refrigeration system and method for refrigeration house |
| CN112728850B (en) * | 2020-12-24 | 2022-06-03 | 武汉巨力鼎兴冷链股份有限公司 | Refrigeration system and method for refrigeration house |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2925714A (en) | Diffuser-regenerator gas turbine engine | |
| EP3904643B1 (en) | System for cooling turbine shaft coupling | |
| CN111102581A (en) | Air inlet device of combustible waste heat recovery system | |
| US9982552B2 (en) | Pressurized incineration facility and pressurized incineration method | |
| WO2012118288A1 (en) | Gas turbine | |
| CN212132465U (en) | Air inlet device of combustible waste heat recovery system | |
| CN111154928A (en) | Environment-friendly leather laser cutting machine with reliable work | |
| CN211119402U (en) | RTO waste gas mixing arrangement | |
| CN209743247U (en) | Anticorrosive high temperature resistant low noise environmental protection centrifugal fan | |
| CN209263338U (en) | A kind of intelligent power saving heating system | |
| CN207554379U (en) | A kind of high-temperature resistant axial-flow fan applied in ship desulphurization system | |
| CN111023074A (en) | Boiler with high coal-fired efficiency and scale cleaning function | |
| CN112128724A (en) | Heat energy recycling boiler capable of accelerating steam outlet speed | |
| CN213684567U (en) | High-temperature gas pumping and exhausting device | |
| CN216245504U (en) | Heater for high-temperature melting of alloy | |
| WO2006133604A1 (en) | Integrated momentum exchanger for preventing and treating emission pollution | |
| CN216898416U (en) | High-temperature waste heat recovery and shunt control system of submerged arc furnace | |
| CN220758565U (en) | Flue gas treatment tower and desulfurization system | |
| CN218442314U (en) | Wind control device of small-sized modularized multi-garbage cooperative processing system | |
| CN215372529U (en) | Smoke backflow prevention device for steel plant | |
| CN108869342A (en) | A kind of energy-efficient air-introduced machine applying to boiler | |
| CN219264338U (en) | Tail gas emission heat sink for wisdom power plant | |
| CN210951843U (en) | Oil and gas boiler | |
| CN220567257U (en) | Special material negative pressure feeding system during garbage incineration | |
| CN220430513U (en) | APU exhaust assembly |
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 | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20210508 Address after: 311-13, 3 / F, 11 Guangming Road, Dongcheng District, Beijing Applicant after: Beijing baichuixin Technology Co.,Ltd. Address before: No.100, Danjie Road, Danyang Development Zone, Zhenjiang City, Jiangsu Province Applicant before: Cui Jianzhong |
|
| TA01 | Transfer of patent application right | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200505 |
|
| WW01 | Invention patent application withdrawn after publication |