CN114060241A - Internal overheat protection device for wind power generation - Google Patents
Internal overheat protection device for wind power generation Download PDFInfo
- Publication number
- CN114060241A CN114060241A CN202111115621.0A CN202111115621A CN114060241A CN 114060241 A CN114060241 A CN 114060241A CN 202111115621 A CN202111115621 A CN 202111115621A CN 114060241 A CN114060241 A CN 114060241A
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- Prior art keywords
- power generation
- fixedly connected
- brake
- wind power
- overheat protection
- 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.)
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Links
- 238000010248 power generation Methods 0.000 title claims abstract description 70
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 34
- 230000001788 irregular Effects 0.000 claims abstract description 26
- 229910052742 iron Inorganic materials 0.000 claims abstract description 17
- 238000009423 ventilation Methods 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 11
- 230000006698 induction Effects 0.000 abstract description 5
- 238000001125 extrusion Methods 0.000 description 11
- 230000017525 heat dissipation Effects 0.000 description 6
- 238000013021 overheating Methods 0.000 description 6
- 230000005389 magnetism Effects 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/60—Cooling or heating of wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/06—Controlling wind motors the wind motors having rotation axis substantially perpendicular to the air flow entering the rotor
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- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/74—Wind turbines with rotation axis perpendicular to the wind direction
Abstract
The invention relates to the technical field of protection of generator sets, and discloses an internal overheat protection device for wind power generation, which comprises a generator main body, wherein a fixed baffle is fixedly arranged inside the generator main body, a generator set is fixedly arranged above the fixed baffle, a power generation blade is rotatably connected above the generator set, a limiting column is fixedly connected outside the power generation blade, a clamping groove is formed in the limiting column, a brake device is arranged at the inner top of the generator main body, the brake device comprises a fixed frame, and a brake rod is arranged inside the fixed frame. According to the device, the lower part of the irregular connecting rod drives the slotted square plate to move left and right, the coil frame swings and cuts the magnetic induction lines, the solenoid is electrified and generates magnetic attraction iron sheets, the iron sheets drive the brake rods to move towards the power generation fan blades together, the brake rods enter the clamping grooves in the limiting columns, so that the power generation fan blades are emergently braked, and the rotation of the power generation fan blades is stopped at a high temperature state, so that the loss of a generator set is reduced.
Description
Technical Field
The invention relates to the technical field of motor group protection, in particular to an internal overheating protection device for wind power generation.
Background
Wind power generation refers to converting kinetic energy of wind into electric energy. Wind energy is clean and pollution-free, and is utilized by people for a long time, mainly by pumping water, grinding surfaces and the like through a windmill, converting kinetic energy of wind into mechanical kinetic energy, and then converting the mechanical energy into electric kinetic energy, namely wind power generation, the principle of the wind power generation is that wind power is utilized to drive windmill blades to rotate, and then the rotating speed is increased through a speed increaser to promote a generator to generate electricity, according to the windmill technology, breeze speed (breeze degree) of about three meters per second can start to generate electricity, the wind power generation forms a heat tide in the world, because the wind power generation does not need to use fuel, and does not generate radiation or air pollution, devices required by the wind power generation are called as wind power generator sets, the wind power generator sets can be divided into three parts, namely a wind power generator and a tower, and the generator sets can generate a large amount of heat during the electricity generation, when the wind generating set is overheated, the components of the device can be damaged if the wind generating set continues to work, the service life of the wind generating set is shortened, and therefore the internal overheating protection device for the wind power generation is provided.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an internal overheating protection device for wind power generation, which has the advantages of emergency braking and automatic heat dissipation when a generator set is overheated, improves the service life of the generator set, and solves the problems that the wind power generator set can generate a large amount of heat during power generation and the components of the device can be damaged when the wind power generator set continues to work during overheating.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an inside overheat protection device of wind power generation, includes the power generation facility main part, the inside fixed mounting of power generation facility main part has fixed stop, fixed stop's top fixed mounting has generating set, generating set's top is rotated and is connected with the electricity generation fan blade, the spacing post of outside fixedly connected with of electricity generation fan blade, the draw-in groove has been seted up on the spacing post, the interior top of power generation facility main part is provided with arresting gear, arresting gear contains fixed frame, fixed frame's inside is provided with the brake lever.
Preferably, a positioning plate is arranged outside the brake rod, a sliding groove matched with the brake rod is formed in the positioning plate, a first spring is fixedly connected in the sliding groove formed in the brake rod, and once the first spring principle power generation device main body is fixedly connected with the brake rod, an iron sheet is fixedly connected outside the brake rod.
When the brake rod moves towards the direction close to the power generation fan blade, the brake rod enters the clamping groove on the limiting column, so that the power generation fan blade is braked emergently.
Preferably, one side of the iron sheet close to the limiting column is fixedly connected with a second spring, and a solenoid is arranged inside the second spring.
The solenoid is electrified to generate magnetic attraction iron sheets, so that the iron sheets drive the brake rod to move towards the direction of the power generation fan blade.
Preferably, a heat dissipation assembly is arranged below the fixed baffle plate and comprises an elastic bag, a ventilation pipe is fixedly connected to the upper surface of the elastic bag, an air guide pipe is fixedly connected to the lower surface of the elastic bag, an air collecting hopper is fixedly connected to the upper end of the ventilation pipe and arranged on the left side and the right side of the generator set, the lower end of the air guide pipe penetrates through the generator main body and is arranged outside the generator main body, and an one-way air valve is fixedly connected to the ventilation pipe and the air guide pipe.
The elastic bag can pass through inside gas and air duct discharge power generation facility when receiving the stripper plate extrusion, and the elastic bag is not received the extrusion and is started to expand in the hot-air that gives off around with generating set inhales the elastic bag through the ventilation pipe to generator set circulation of air has all around been accelerated, has further accelerated generating set's heat dissipation.
Preferably, the left side and the right side of the elastic bag are both provided with a driving assembly, the driving assembly comprises a driving disc, a driving device is arranged behind the driving disc, a pushing member is fixedly connected to the front of the driving disc, the upper part of the pushing member is movably connected with an irregular connecting rod, the upper end of the irregular connecting rod is movably connected with a pushing rod, one end of the irregular connecting rod based on the principle of the pushing rod is fixedly connected with an extrusion plate, and the extrusion plate is arranged outside the elastic bag.
The driving device drives the driving disc to rotate, the driving disc drives the pushing piece to rotate together when rotating, and the pushing piece pulls the irregular connecting rod to swing left and right when rotating.
Preferably, the front of the irregular connecting rod is movably connected with a slotted square plate, one end, far away from the inner wall of the power generation device main body, of the slotted square plate is fixedly connected with a coil frame, and a magnet group is arranged outside the coil frame.
When the irregular connecting rod swings, the upper part pushes the push rod to move, the push rod drives the extrusion plate to extrude the elastic bag, the lower part of the irregular connecting rod drives the grooved square plate to move left and right, and the grooved square plate moves left and right to drive the coil frame to swing and cut magnetic induction lines generated by the magnet group.
Preferably, the solenoid is electrically connected to the bobbin.
When the coil frame is electrified, the solenoid is electrified together.
Compared with the prior art, the invention provides an internal overheating protection device for wind power generation, which has the following beneficial effects:
1. when the wind power generation internal overheating protection device is used, when the temperature in the wind generating set is too high and reaches a threshold value, the protection device is started, the driving device is powered on and drives the driving disc to rotate, the driving disc drives the pushing piece to rotate together when rotating, the irregular connecting rod is pulled to swing left and right when the pushing piece rotates, the upper part pushes the push rod to move when the irregular connecting rod swings, the push rod drives the extrusion plate to extrude the elastic bag, the elastic bag can discharge the internal gas out of the generating set through the air duct when being extruded by the extrusion plate, the elastic bag absorbs the hot air emitted from the periphery of the generating set into the elastic bag through the ventilation duct when beginning to expand without being extruded, thereby quickening the air circulation around the generator set, further quickening the heat dissipation of the generator set, and further prolonging the service life of the generator set.
2. This inside overheat protection device of wind power generation, the lower part of irregular connecting rod drives the side of slotting board and removes, the side of slotting board is removed and is then driven the coil frame swing and cut the magnetic induction line that magnet group produced, the coil frame circular telegram makes the solenoid circular telegram together this moment, solenoid circular telegram produces magnetism and attracts the iron sheet, thereby make the iron sheet drive the brake lever and remove towards the electricity generation fan blade direction together, then can get into the draw-in groove on the spacing post when the brake lever is removed towards being close to the electricity generation fan blade direction, thereby make the urgent braking of electricity generation fan blade, thereby the rotation that stops the electricity generation fan blade under the high temperature state has reduced generating set's loss.
Drawings
FIG. 1 is a schematic front cross-sectional view of the inventive structure;
FIG. 2 is a schematic top sectional view of a power generation blade and a limiting column structure according to the present invention;
FIG. 3 is a schematic view of a related structure of the position limiting assembly of the present invention;
FIG. 4 is a schematic diagram of a related structure of a driving assembly according to the present invention;
FIG. 5 is an enlarged view of area A of FIG. 4 according to the present invention.
Wherein: 100. a power generation device main body; 200. a generator set; 201. a power generation fan blade; 202. a limiting column; 203. a card slot; 300. a fixed frame; 400. a brake lever; 401. a first spring; 402. iron sheets; 403. a solenoid; 404. a second spring; 500. an elastic bag; 501. a vent pipe; 502. an air duct; 503. a wind collecting hopper; 600. a drive disc; 601. a pusher member; 602. an irregular connecting rod; 603. a push rod; 604. a pressing plate; 700. slotting a square plate; 701. a coil frame; 702. a magnet group.
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.
Referring to fig. 1 to 5, an internal overheat protection device for wind power generation includes a power generation device main body 100, a fixed baffle is fixedly installed inside the power generation device main body 100, a power generation unit 200 is fixedly installed above the fixed baffle, a power generation blade 201 is rotatably connected above the power generation unit 200, a limit post 202 is fixedly connected outside the power generation blade 201, a clamping groove 203 is formed in the limit post 202, a braking device is arranged at the inner top of the power generation device main body 100, the braking device includes a fixed frame 300, and a braking rod 400 is arranged inside the fixed frame 300.
Specifically, a positioning plate is arranged outside the brake lever 400, a sliding groove matched with the brake lever 400 is formed in the positioning plate, a first spring 401 is fixedly connected in the sliding groove formed in the brake lever 400, and once the first spring 401 is fixedly connected with the brake lever 400, the first spring 401 is fixedly connected with the brake lever 400 outside the power generation device main body 100, and an iron sheet 402 is fixedly connected with the brake lever 400.
According to the above technical solution, when the brake lever 400 moves toward the direction close to the power generation blade 201, it will enter the slot 203 on the limiting column 202, so that the power generation blade 201 brakes emergently.
Specifically, a second spring 404 is fixedly connected to one side of the iron sheet 402 close to the limiting column 202, and a solenoid 403 is arranged inside the second spring 404.
According to the above technical solution, the solenoid 403 is energized to magnetically attract the iron piece 402, so that the iron piece 402 drives the brake lever 400 to move together towards the power generation blade 201.
Specifically, radiator unit is provided with below the fixed stop, radiator unit contains elasticity bag 500, the higher authority fixedly connected with ventilation pipe 501 of elasticity bag 500, fixedly connected with air duct 502 below the elasticity bag 500, the upper end fixedly connected with collection wind fill 503 of ventilation pipe 501, collection wind fill 503 sets up generating set 200's left side and right side, the lower extreme of air duct 502 runs through power generation facility main part 100 and sets up the outside of power generation facility main part 100, equal fixedly connected with one-way pneumatic valve on ventilation pipe 501 and the air duct 502.
According to the technical scheme, when the elastic bag 500 is extruded by the extrusion plate 604, the internal air is exhausted out of the power generation device through the air guide pipe 502, and when the elastic bag 500 is not extruded and begins to expand, hot air dissipated around the generator set 200 is sucked into the elastic bag 500 through the ventilation pipe 501, so that the air circulation around the generator set 200 is accelerated, and the heat dissipation of the generator set 200 is further accelerated.
Specifically, the left side and the right side of the elastic bag 500 are both provided with a driving assembly, the driving assembly comprises a driving disc 600, a driving device is arranged behind the driving disc 600, a pushing member 601 is fixedly connected to the front of the driving disc 600, the upper part of the pushing member 601 is movably connected with an irregular connecting rod 602, the upper end of the irregular connecting rod 602 is movably connected with a pushing rod 603, one end of the irregular connecting rod 602 based on the principle of the pushing rod 603 is fixedly connected with a squeezing plate 604, and the squeezing plate 604 is arranged outside the elastic bag 500.
According to the technical scheme, the driving device drives the driving disc 600 to rotate, the driving disc 600 drives the pushing piece 601 to rotate together when rotating, and the pushing piece 601 pulls the irregular connecting rod 602 to swing left and right when rotating.
Specifically, a slotted square plate 700 is movably connected to the front of the irregular connecting rod 602, a coil frame 701 is fixedly connected to one end, away from the inner wall of the power generation device main body 100, of the slotted square plate 700, and a magnet group 702 is arranged outside the coil frame 701.
According to the technical scheme, when the irregular connecting rod 602 swings, the upper part pushes the push rod 603 to move, the push rod 603 drives the extrusion plate 604 to extrude the elastic bag 500, the lower part of the irregular connecting rod 602 drives the slotted square plate 700 to move left and right, and the slotted square plate 700 moves left and right to drive the coil frame 701 to swing and cut magnetic induction lines generated by the magnet group 702.
Specifically, the solenoid 403 is electrically connected to the bobbin 701.
According to the above technical solution, when the coil frame 701 is energized, the solenoid 403 is energized together.
The working principle is as follows: when the internal overheat protection device for wind power generation is used, when the temperature inside the wind generating set 200 is too high and reaches a threshold value, the protection device is started, firstly, the driving device is electrified and drives the driving disc 600 to rotate, the driving disc 600 drives the pushing piece 601 to rotate together when rotating, the pushing piece 601 pulls the irregular connecting rod 602 to swing left and right when rotating, the upper part pushes the pushing rod 603 to move when the irregular connecting rod 602 swings, the pushing rod 603 drives the extrusion plate 604 to extrude the elastic bag 500, the elastic bag 500 can discharge internal gas out of the generating set through the air duct 502 when being extruded by the extrusion plate 604, the hot air dissipated around the generating set 200 is sucked into the elastic bag 500 through the air duct 501 when the elastic bag 500 starts to expand without being extruded, thereby quickening the air circulation around the generator set 200, further quickening the heat dissipation of the generator set 200, and further prolonging the service life of the generator set 200.
The lower portion of the irregular connecting rod 602 drives the slotted square plate 700 to move left and right, the slotted square plate 700 moves left and right to drive the coil former 701 to swing and cut a magnetic induction line generated by the magnet group 702, at the moment, the coil former 701 is electrified and the solenoid 403 is electrified together, the solenoid 403 is electrified to generate magnetism to attract the iron sheet 402, so that the iron sheet 402 drives the brake rod 400 to move towards the power generation fan blade 201 together, the brake rod 400 moves towards the direction close to the power generation fan blade 201 and enters the clamping groove 203 on the limiting column 202, so that the power generation fan blade 201 brakes emergently, and the rotation of the power generation fan blade 201 is stopped at a high temperature state, so that the loss of the generator set 200 is reduced.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. An internal overheat protection device for wind power generation, comprising a power generation device main body (100), characterized in that: the inside fixed mounting of power generation facility main part (100) has fixed stop, fixed stop's top fixed mounting has generating set (200), the top of generating set (200) is rotated and is connected with electricity generation fan blade (201), the spacing post of outside fixedly connected with (202) of electricity generation fan blade (201), draw-in groove (203) have been seted up on spacing post (202), the interior top of power generation facility main part (100) is provided with arresting gear, arresting gear contains fixed frame (300), the inside of fixed frame (300) is provided with brake lever (400).
2. The wind power generation internal overheat protection device according to claim 1, wherein: the brake device is characterized in that a positioning plate is arranged outside the brake rod (400), a sliding groove matched with the brake rod (400) is formed in the positioning plate, a first spring (401) is fixedly connected in the sliding groove formed in the brake rod (400), once the first spring (401) principle power generation device main body (100) is fixedly connected with the brake rod (400), and an iron sheet (402) is fixedly connected to the outside of the brake rod (400).
3. The wind power generation internal overheat protection device according to claim 2, wherein: one side of the iron sheet (402) close to the limiting column (202) is fixedly connected with a second spring (404), and a solenoid (403) is arranged inside the second spring (404).
4. The wind power generation internal overheat protection device according to claim 1, wherein: the utility model discloses a power generation set, including fixed stop's below, radiator unit, upper end fixedly connected with wind collection fill (503) of ventilation pipe (501), the higher authority fixedly connected with ventilation pipe (501) of elasticity bag (500), fixedly connected with air duct (502) below elasticity bag (500), the upper end fixedly connected with wind collection fill (503) of ventilation pipe (501), wind collection fill (503) set up the left side and the right side of generating set (200), the lower extreme of air duct (502) runs through power generation set main part (100) and sets up the outside of power generation set main part (100), equal fixedly connected with one-way pneumatic valve on ventilation pipe (501) and air duct (502).
5. The wind power generation internal overheat protection device according to claim 4, wherein: the left side and the right side of the elastic bag (500) are both provided with a driving assembly, the driving assembly comprises a driving disc (600), a driving device is arranged behind the driving disc (600), a pushing part (601) is fixedly connected to the front of the driving disc (600), an irregular connecting rod (602) is movably connected to the upper part of the pushing part (601), the upper end of the irregular connecting rod (602) is movably connected with a pushing rod (603), one end of the irregular connecting rod (602) based on the pushing rod (603) is fixedly connected with a squeezing plate (604), and the squeezing plate (604) is arranged outside the elastic bag (500).
6. The wind power generation internal overheat protection device according to claim 5, wherein: the front of the irregular connecting rod (602) is movably connected with a slotted square plate (700), one end, far away from the inner wall of the power generation device main body (100), of the slotted square plate (700) is fixedly connected with a coil frame (701), and a magnet group (702) is arranged outside the coil frame (701).
7. A wind power generation internal overheat protection apparatus as claimed in claims 3 and 6, wherein: the solenoid (403) is electrically connected with the coil frame (701).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111115621.0A CN114060241A (en) | 2021-09-23 | 2021-09-23 | Internal overheat protection device for wind power generation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111115621.0A CN114060241A (en) | 2021-09-23 | 2021-09-23 | Internal overheat protection device for wind power generation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114060241A true CN114060241A (en) | 2022-02-18 |
Family
ID=80234071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111115621.0A Withdrawn CN114060241A (en) | 2021-09-23 | 2021-09-23 | Internal overheat protection device for wind power generation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114060241A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115102335A (en) * | 2022-06-06 | 2022-09-23 | 深圳市腾源建设集团有限公司 | Energy-saving motor of multi-pole speed-regulating fresh air system |
-
2021
- 2021-09-23 CN CN202111115621.0A patent/CN114060241A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115102335A (en) * | 2022-06-06 | 2022-09-23 | 深圳市腾源建设集团有限公司 | Energy-saving motor of multi-pole speed-regulating fresh air system |
| CN115102335B (en) * | 2022-06-06 | 2023-02-14 | 深圳市腾源建设集团有限公司 | Energy-saving motor of multi-pole speed regulation fresh air system |
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Application publication date: 20220218 |
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| WW01 | Invention patent application withdrawn after publication |