CN109072891A - fluid energy machine - Google Patents
fluid energy machine Download PDFInfo
- Publication number
- CN109072891A CN109072891A CN201780026620.4A CN201780026620A CN109072891A CN 109072891 A CN109072891 A CN 109072891A CN 201780026620 A CN201780026620 A CN 201780026620A CN 109072891 A CN109072891 A CN 109072891A
- Authority
- CN
- China
- Prior art keywords
- fluid energy
- energy machine
- shell
- motor
- pressure
- 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- Withdrawn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
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
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/06—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure
- F04B15/08—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure the liquids having low boiling points
-
- 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
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
-
- 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
- F04B51/00—Testing machines, pumps, or pumping installations
-
- 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
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/06—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure
- F04B15/08—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure the liquids having low boiling points
- F04B2015/081—Liquefied gases
- F04B2015/0822—Hydrogen
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Reciprocating Pumps (AREA)
Abstract
The present invention relates to a kind of fluid energy machines, it includes crank driver (A) and the driving equipment for being mechanically connected to crank driver (A), wherein for driving equipment tool there are two motor (M), respective output block is mechanically connected to crank driver.According to the present invention, fluid energy machine, which is configured in, seals relative to environment by fluid energy machine and is connected in the shell (1-5) of Pressure Maintenance System.The invention further relates to the methods for operating such fluid energy machine.
Description
Technical field
The present invention relates to a kind of including crank driver and the driving equipment for being mechanically connected to crank driver
Fluid energy machine, wherein driving equipment includes two motor, and respective output block is mechanically connected to crank drive
Dynamic device, and the present invention relates to the methods for operating the fluid energy machine.
Background technique
The fluid of so-called cryogenic pump or cryogenic high pressure pump suitable for conveying in low temperature range, it is known that cryogenic pump or low temperature
High-pressure pump can be used for the equipment that refuels for the motor vehicle for being for example applicable in the hydrogen supplied in liquid form.
DE102007035616A1 discloses the pump for being particularly designed for cryogenic media.The pump is defeated including being designed to
Send and/or compress " piston-cylinder " unit of perishing fluid (for example, hydrogen).
This pump is usually operated with hydraulic unit driver.Other traditional temperature pumping equipment include rotating driver rather than
Hydraulic unit driver, wherein the rotating driver is connected to the piston of " piston-cylinder " unit.
The hydraulic unit driver of temperature pumping equipment usually require relatively large structural volume accommodate auxiliary unit and
The reservoir of cooling device and hydraulic fluid.In addition, the phase in terms of its installation and maintenance of the pumping equipment with hydraulic unit driver
To valuableness, and also need installation for the measuring system of the position measurement in hydraulic cylinder.For this purpose, usually providing linear position measurement
System must adjust the sinusoidal volume flow peak value for accelerating profile, not allowing to avoid generation of the piston in pumping equipment
When using Hydraulically Operated Equipment, the realization of corresponding acceleration curve and the control for being used for required control and installing thus
System and increased cost are associated.In addition, fluid pressure drive device generally can not realize that frequency is greater than about " piston-cylinder " of 2Hz
The reciprocating motion of unit.
In the modification for including motor driver and crank driver, the volume of the maximum frequency dependence of commercially available motor
Determine torque limit pumping equipment to hold about the maximum capacity of accessible flow velocity and the maximum of accessible discharge pressure
Amount.If attempting to realize high flow rate and high discharge pressure, must by motor by corresponding reciprocating frequency and power or
Torque is applied on crank driver.This means that corresponding reaction force be respectively acting on motor or its installation part and/
Or it acts on the installation part of the torque transmitting machine between motor and crank gear.In order not to make installation point by right
The abrasion answered then must correspondingly adjust the stability of installation point, it is especially noted that working as the output block base of motor
When being coaxially arranged with the rotary part of crank driver in sheet and be rigidly connected to the crank driver, this puts especially bright
It is aobvious.
Summary of the invention
Fluid energy machine suitable for solving these disadvantages includes that crank driver drives with crank is mechanically connected to
The driving equipment of dynamic device, wherein torque can be introduced crank driver by the driving equipment.Fluid energy machine further includes
" piston-cylinder " unit, the piston of the unit are mechanically connected to crank driver.Proposing the driving equipment includes two
Motor, corresponding output block are mechanically connected to crank driver.Furthermore proposing " piston-cylinder " unit includes only
One piston and only one cylinder.Motor (hereinafter simply also referred to as motor) is realized in the form of rotation motor, wherein can also set
Think the configuration of more than two motor.Therefore, driving equipment includes at least two motors.
It can be seen that one of this fluid energy machine the advantage is that although the slow rotation speed of axis is 1 to 600
Between rev/min (rpm), but it still can produce required high pressure.Although rotation speed is slow, motor is used
It may be implemented within the scope of 1000 to 8000Nm, be especially up to the high torque of 4000Nm.Piston rod is applied to due to the torque
On power between 10 between 150kN, especially 15 between 20kN.Since two motors are connected to crank driver,
The distribution for correspondingly realizing balanced load and symmetrical counter-force or reaction torque on two motors or its transmission shaft, so that can
To reduce total load and/or abrasion in driving equipment and crank driver.Installation part can have corresponding lesser size, or
Person's axis can be realized correspondingly with lesser diameter.
The shortcomings that this fluid energy machine is, can not due to lacking existing, suitable motor on the market
It can be installed in the explosion-proof area of classification I and II.However, this is especially important for conveying hydrogen and other combustibles.
The present invention is based on purpose be to disclose a kind of fluid energy machine and a kind of for operating the side of fluid energy machine
Method, wherein the fluid energy machine can be used for the explosion-proof area of classification I and II.
About the equipment, this purpose is realized as follows: i.e. fluid energy machine is configured in shell, the shell
Fluid energy machine is sealed relative to environment, and shell is connected to Pressure Maintenance System.
The motor used advantageously water-cooled motor.In this way, the air for cooling down motor is not needed
Supply, so as to simplify shell sealing.
About this method, above-mentioned purpose is realized as follows, i.e. fluid energy machine is configured in shell, and pressurization is situated between
Mass flow is through shell.Shell is realized preferably in the form of load bearing shell.
Shell is preferably split into multiple compartments, wherein each compartment is connected to each other.Compartment is advantageously serially connected.Add
Pressure medium preferably continuously flows through compartment.
In a preferred embodiment, shell is divided into three or five compartments, and wherein first compartment surrounds crank driving
Device, and it is equipped with the conducting portion for crank driver to be connected to " piston-cylinder " unit.All conducting portions of shell are all logical
Sealing mechanism familiar to those skilled in the art is crossed to be sealed relative to environment.Lid, the seal groove with sealing ring, bonding are close
Sealing and especially sealing screw are likely to be used for this purpose
Other two compartment correspondingly represents the outer compartment of phase induction motor.Corresponding magnet, coil and power electronics are set
It is standby to be particularly contained in these compartments.These compartments are particularly provided with conducting portion and control for cooling system and power supply
System.In a preferred embodiment, two additional compartments correspondingly form the inner compartment of two motor.It is dynamic for respective motors
The connector of the corresponding axis of power transmitting is located in these compartments.These compartments are opposite by the additional nut cap with special sealing piece
Sealed in atmosphere, and compartment can leading axle pass through.However, in a further advantageous embodiment, motor can also be only
It is configured in a compartment.
Shell is particularly realized in such a way, it can the over-voltage between 0.01 to 50 millibar of application, especially 2.5
The over-voltage of millibar.This means that the sealing element for sealing all conducting portions is realized in such a way, that is, if shell
Internal pressure is more than 0.01 to 50 millibar of pressure in the local environment of fluid energy machine, especially 2.5 millibars, is not then had
Pressure medium evolution.In a preferred embodiment (wherein shell relative to environment seal), if do not occur it is constant through-flow, can also
To generate over-voltage.
Shell is advantageously connected to Pressure Maintenance System by entrance and exit.Entrance is preferably provided in first compartment
On, and export and be mounted on the last one compartment, especially the 5th compartment.Compartment through hole is connected to each other, so that in all
Absolutely empty is connected to each other, and pressure medium can flow through these hollow spaces.
Pressure Maintenance System advantageously maintains the over-voltage of pressure medium.Pressure Maintenance System is preferably with compressor station or gas
The form of cylinder frame is realized.It is situated between if pressure medium is escaped into environment from shell due to small leakage and thus causes to pressurize
The loss of matter can then introduce new pressure medium by Pressure Maintenance System.Therefore, pressure medium advantageously need not be continuously
Shell is flowed through, it is preferred that only adding new pressure medium when the over-voltage in shell drops to predetermined value or less.
Air, nitrogen or other inert gases are advantageously used as pressure medium.Pressure medium is preferably with 0.01 to 50 milli
Bar, especially 2.5 millibars of over-voltage flows through shell.
Due to over-voltage, inactive mixture can flow into shell from outside, so that showing as the electricity of potential incendiary source
Motivation is protected, and therefore fluid energy machine can be installed and used in explosion-proof area.
The sensor of pressure for monitoring pressure medium can advantageously be arranged on the inner and/or outer shell of Pressure Maintenance System
It is interior.If a pressure be detected that deviateing predetermined value (for example, in the form of pressure loss), this indicates leakage.Sensor is advantageous
Ground is connected to motor, so that their (motor) can be closed and power off.In this way, motor will no longer be shown as
Incendiary source.
In addition, the sensor for detecting the trace of medium to be conveyed can be equipped in pressure medium, it is outer to detect
Leakage in shell.In this way, it has been able to detect by the Small leak of fluid energy machine medium to be conveyed.In addition, to
The common combustible medium of conveying is pressurized medium and is discharged from system.It is possible thereby to reduce the risk of explosion.
If it exceeds scheduled limiting value, then can stop fluid energy machine.
After fluid energy machine and/or Pressure Maintenance System stop, preferably being rushed with the increase flow of pressure medium
Wash system for a period of time, especially 2 to 5 minutes, potential pollutant to remove.
Fluid energy machine, which is advantageously used in, generates hydrogen volume flow and for compression hydrogen.It is preferably used to
Liquid or Gaseous Hydrogen are supplemented for vehicle.In this case, hydrogen is compressed to 50 to 1000 bars of system pressure, especially
350 to 500 bars or 700 bars or 900 bars.The rate of discharge of hydrogen is adjusted advantageously according to the frequency of motor, so that it is situated between
Between 0 and 250kg/h, particularly between 30 and 200kg/h.
Specific embodiment
Below with reference to the design schematically shown in Fig. 1 exemplary embodiment come the present invention will be described in more detail.
Fig. 1 schematically shows the embodiment of apparatus of the present invention.The figure shows the high pressures using Explosion-proof Design form
The shell of pump.The pump is suitable for cryogen, particularly suitable for hydrogen.
Shell is divided into compartment 1 to 5, wherein each compartment is connected to each other.Compartment 1 surround crank driver A. compartment 2 and every
Room 4 correspondingly represents the outer compartment of phase induction motor M.Corresponding magnet, coil and power electronic equipment are particularly contained in
In these compartments.Compartment 3 and compartment 5 correspondingly form the inner compartment of two motor M.What the power for respective motors transmitted
The connector of corresponding axis is located in these compartments.These compartments are by the additional nut cap W with special sealing piece relative to atmosphere
Sealing.
All hollow spaces in respective compartment can through hole and fluid can and.Therefore, pressure medium can reach
And thus rinse all hollow spaces in shell.
Pressure medium is introduced into shell by the supply line of pressure medium E, in this exemplary embodiment, pressurization
Medium is configured in compartment 1.Pressure medium flows continuously through all compartments 1 to 5, and again passes by outlet D and return
To the Pressure Maintenance System in compartment 5.
Pressure Maintenance System is designed to maintain pressure medium under 2.5 millibars of pressure.If pressure medium by
It is escaped into environment in Small leak, then can supply additional pressure medium by Pressure Maintenance System.If a pressure be detected that
Pressure in holding system declines or detects that the hydrogen content of pressure medium is excessively high, then starts emergency cut-off.Motor stops simultaneously
Power-off.In this way, motor will no longer show as incendiary source.After executing corresponding maintenance work, it can restart and be
System.
When Pressure Maintenance System initial start or when restarting after static, Pressure Maintenance System is pressurized medium and increases
The mass flow added is rinsed defined a period of time, and especially 2 minutes.It is escaped into during shutdown from pump or pipeline as a result, outer
Any hydrogen in shell is all removed or is at least diluted.
Claims (10)
1. a kind of fluid energy machine, the fluid energy machine includes crank driver and is mechanically connected to crank drive
The driving equipment of dynamic device, wherein the driving equipment includes two motor, the corresponding output block of motor is mechanical
Ground is connected to the crank driver, which is characterized in that the fluid energy machine is configured in shell, and the shell is opposite
The fluid energy machine is sealed in environment and is connected to Pressure Maintenance System.
2. fluid energy machine according to claim 1, which is characterized in that the shell is divided into multiple compartments, described
Compartment is connected to each other.
3. fluid energy machine according to claim 1 or 2, which is characterized in that the shell is connected by entrance and exit
It is connected to the Pressure Maintenance System.
4. fluid energy machine according to claim 1 or 2, which is characterized in that the shell is real in this following mode
It is existing, the over-voltage of 0.01 to 50 millibar, especially 2.5 millibar can be applied.
5. a kind of method for operating fluid energy machine, the fluid energy machine includes crank driver and mechanical connection
To the driving device of crank driver, the driving device includes two motor, the corresponding output block quilt of the motor
It is mechanically connected to crank driver, which is characterized in that the fluid energy machine is configured in shell, and pressure medium flows through
Shell.
6. according to the method described in claim 5, it is characterized in that, air, nitrogen or other inert gases are used as described add
Press medium.
7. method according to claim 5 or 6, which is characterized in that the pressure medium is with 0.01 to 50 millibar, especially
2.5 millibars of over-voltage flows through shell.
8. the method according to one of claim 5 to 7, which is characterized in that maintain the pressurization to be situated between with Pressure Maintenance System
The over-voltage of matter.
9. the method according to one of claim 5 to 8, which is characterized in that the shell is divided into multiple compartments, it is described every
Room is connected to each other, and the pressure medium is followed by the compartment.
10. the method according to one of claim 5 to 9, which is characterized in that the fluid energy machine is for generating hydrogen
Volume flow and/or be used for compression hydrogen.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102016005216.3A DE102016005216A1 (en) | 2016-04-28 | 2016-04-28 | Fluid energy machine |
| DE102016005216.3 | 2016-04-28 | ||
| PCT/EP2017/000482 WO2017186341A1 (en) | 2016-04-28 | 2017-04-12 | Fluid energy machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109072891A true CN109072891A (en) | 2018-12-21 |
Family
ID=58644993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780026620.4A Withdrawn CN109072891A (en) | 2016-04-28 | 2017-04-12 | fluid energy machine |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20190128246A1 (en) |
| EP (1) | EP3449123A1 (en) |
| JP (1) | JP2019515177A (en) |
| KR (1) | KR20190002606A (en) |
| CN (1) | CN109072891A (en) |
| DE (1) | DE102016005216A1 (en) |
| WO (1) | WO2017186341A1 (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5056991A (en) * | 1989-03-10 | 1991-10-15 | Deutsche Forschungsanstalt Fuer Luft- Und Raumfahrt E.V. | Cryogas pump |
| CN2453151Y (en) * | 2000-07-21 | 2001-10-10 | 王若亮 | Water supply apparatus using water power |
| KR20030032303A (en) * | 2001-10-17 | 2003-04-26 | 엘지전자 주식회사 | device for pumping hydrogen in system of hydrogen storage alloy |
| CN201137518Y (en) * | 2008-01-10 | 2008-10-22 | 陈维加 | Opposed type generator |
| DE102009005447A1 (en) * | 2009-01-21 | 2010-07-22 | Wabco Gmbh | Piston machine for motor vehicle, particularly commercial vehicle, has two crankshafts, two piston rods and conjoint piston, where both piston rods conjointly drive piston by bearing and piston bolt |
| CN102042188A (en) * | 2009-10-21 | 2011-05-04 | 中国科学院理化技术研究所 | Low-temperature liquid hydrogen pump and application thereof |
| CN202194801U (en) * | 2011-09-05 | 2012-04-18 | 广州市安途电器有限公司 | Dual drive type inflation pump |
| CN202358618U (en) * | 2011-11-18 | 2012-08-01 | 三一重型装备有限公司 | Dual-motor drive device of conveyor and conveyor |
| CN203674886U (en) * | 2014-01-17 | 2014-06-25 | 南阳防爆（苏州）特种装备有限公司 | Positive pressure ventilation control apparatus for explosion-proof motor |
| CN104564604A (en) * | 2013-09-23 | 2015-04-29 | 贺尔碧格压缩机技术控股有限公司 | Compressor with and method for flushing the compressor housing with flushing gas |
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| US3487657A (en) * | 1968-12-04 | 1970-01-06 | Trane Co | Refrigeration system with multiple motor and crankshaft compressor |
| US4574591A (en) * | 1983-08-29 | 1986-03-11 | Helix Technology Corporation | Clearance seals and piston for cryogenic refrigerator compressors |
| DE9301603U1 (en) * | 1993-02-05 | 1994-06-09 | Knf-Neuberger Gmbh, 79112 Freiburg | Pump for pumping explosive gases |
| DE19709206A1 (en) * | 1997-03-06 | 1998-09-10 | Leybold Vakuum Gmbh | Vacuum pump |
| US5957667A (en) * | 1997-05-23 | 1999-09-28 | Ballard Generation Systems Inc. | Oilless compressor with a pressurizable crankcase and motor containment vessel |
| JP2001280247A (en) * | 2000-03-31 | 2001-10-10 | Toyota Autom Loom Works Ltd | Motor-driven compressor |
| US20070104600A1 (en) * | 2003-03-05 | 2007-05-10 | Sabine Meier | Oscillating piston pump |
| US7249459B2 (en) * | 2003-06-20 | 2007-07-31 | Denso Corporation | Fluid machine for converting heat energy into mechanical rotational force |
| DE102007035616A1 (en) | 2007-07-30 | 2009-02-05 | Linde Ag | Cryogenic medium piston pump, especially for liquid hydrogen for vehicles, has device for supplying cooling medium into region of cylinder volume wall |
| NO333684B1 (en) * | 2011-03-07 | 2013-08-12 | Aker Subsea As | UNDERWATER PRESSURE COOKING MACHINE |
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-
2016
- 2016-04-28 DE DE102016005216.3A patent/DE102016005216A1/en not_active Withdrawn
-
2017
- 2017-04-12 CN CN201780026620.4A patent/CN109072891A/en not_active Withdrawn
- 2017-04-12 EP EP17720359.3A patent/EP3449123A1/en not_active Withdrawn
- 2017-04-12 US US16/096,062 patent/US20190128246A1/en not_active Abandoned
- 2017-04-12 KR KR1020187034407A patent/KR20190002606A/en unknown
- 2017-04-12 WO PCT/EP2017/000482 patent/WO2017186341A1/en active Application Filing
- 2017-04-12 JP JP2018556377A patent/JP2019515177A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5056991A (en) * | 1989-03-10 | 1991-10-15 | Deutsche Forschungsanstalt Fuer Luft- Und Raumfahrt E.V. | Cryogas pump |
| CN2453151Y (en) * | 2000-07-21 | 2001-10-10 | 王若亮 | Water supply apparatus using water power |
| KR20030032303A (en) * | 2001-10-17 | 2003-04-26 | 엘지전자 주식회사 | device for pumping hydrogen in system of hydrogen storage alloy |
| CN201137518Y (en) * | 2008-01-10 | 2008-10-22 | 陈维加 | Opposed type generator |
| DE102009005447A1 (en) * | 2009-01-21 | 2010-07-22 | Wabco Gmbh | Piston machine for motor vehicle, particularly commercial vehicle, has two crankshafts, two piston rods and conjoint piston, where both piston rods conjointly drive piston by bearing and piston bolt |
| CN102042188A (en) * | 2009-10-21 | 2011-05-04 | 中国科学院理化技术研究所 | Low-temperature liquid hydrogen pump and application thereof |
| CN202194801U (en) * | 2011-09-05 | 2012-04-18 | 广州市安途电器有限公司 | Dual drive type inflation pump |
| CN202358618U (en) * | 2011-11-18 | 2012-08-01 | 三一重型装备有限公司 | Dual-motor drive device of conveyor and conveyor |
| CN104564604A (en) * | 2013-09-23 | 2015-04-29 | 贺尔碧格压缩机技术控股有限公司 | Compressor with and method for flushing the compressor housing with flushing gas |
| CN203674886U (en) * | 2014-01-17 | 2014-06-25 | 南阳防爆（苏州）特种装备有限公司 | Positive pressure ventilation control apparatus for explosion-proof motor |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP3449123A1 (en) | 2019-03-06 |
| JP2019515177A (en) | 2019-06-06 |
| DE102016005216A1 (en) | 2017-11-02 |
| WO2017186341A1 (en) | 2017-11-02 |
| US20190128246A1 (en) | 2019-05-02 |
| KR20190002606A (en) | 2019-01-08 |
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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: 20181221 |
|
| WW01 | Invention patent application withdrawn after publication |