CN108571449A - Biphase gas and liquid flow visual experimental apparatus in liquid rotary pump - Google Patents
Biphase gas and liquid flow visual experimental apparatus in liquid rotary pump Download PDFInfo
- Publication number
- CN108571449A CN108571449A CN201810633389.1A CN201810633389A CN108571449A CN 108571449 A CN108571449 A CN 108571449A CN 201810633389 A CN201810633389 A CN 201810633389A CN 108571449 A CN108571449 A CN 108571449A
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- China
- Prior art keywords
- liquid
- valve
- pump
- air inlet
- rotary pump
- 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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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
- F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
- F04C18/3446—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along more than one line or surface
- F04C18/3447—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along more than one line or surface the vanes having the form of rollers, slippers or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/28—Safety arrangements; Monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
Abstract
The invention belongs to liquid rotary pump performance detection technical fields, more particularly to biphase gas and liquid flow visual experimental apparatus in a kind of liquid rotary pump, including chassis and control centre, chassis is equipped with single shaft liquid-ring vacuum pump, single shaft liquid-ring vacuum pump is equipped with air inlet pipeline, air inlet pipeline is equipped with air inlet, according to by the trend close to air inlet to separate air inlet, the first vacuum meter, orifice flowmeter, the second vacuum meter, valve first, pressure transmitter and check-valves are disposed on air inlet pipeline, orifice flowmeter passes through flowmeter piping connection differential pressure transmitter；Gas exhaust piping is additionally provided on single shaft liquid-ring vacuum pump, gas exhaust piping is connected to pressure vessel, and pressure vessel is equipped with liquid level gauge and pressure gauge.Present invention can apply to the scientific experiments of multiphase fluid dynamics feature detection, and theoretical and technical foundation is provided for the exploitation of novel liquid rotary pump.
Description
Technical field
The present invention relates to biphase gas and liquid flow visual experimental apparatus in a kind of liquid rotary pump, belong to liquid rotary pump performance detection technology
Field.
Background technology
Liquid-ring vacuum pump is a kind of fluid machinery for pumping gas, it is also possible to make compressor, make to be known as when compressor
Liquid rotary compressor.Flowing is the biphase gas and liquid flow with free interface, the liquid-working-medium in pump in its in the course of work
The effects that playing sealing, transmitting energy and is cooling.Due to the complexity of the harshness and interior flowing of the application environment of pump, for such as
The optimizing research of the vane type oil pump hydraulic performance of liquid rotary pump one kind is the hot issue of domestic and international field of hydraulic machinery.
Although the researcher of domestic and international related field has done largely the internal flow and performance evaluation of liquid rotary pump
Basic work, but it is real due to lacking a kind of visualization carrying out direct observational study to liquid rotary pump interior flow field always for many years
Experiment device, between secondary flow structure in pumping, free interface shape changing rule and its with the external characteristics of pump relationship etc. depth
Enter analysis and lack practical test experience means, cause the optimization design to the shell molded line of impeller and pump be difficult to carry out deeper into
Research.
Invention content
According to the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to：One kind is provided and can be used for multiphase
Biphase gas and liquid flow visual experimental apparatus in the liquid rotary pump of hydrodynamic characters detection provides theory for the exploitation of novel liquid rotary pump
With technical foundation.
Biphase gas and liquid flow visual experimental apparatus in liquid rotary pump of the present invention, including chassis and control centre, control
Flow Meter Based is equipped in center；Chassis is equipped with single shaft liquid-ring vacuum pump, and single shaft liquid-ring vacuum pump is by variable-frequency electric
Machine drives, and single shaft liquid-ring vacuum pump is equipped with air inlet pipeline, and air inlet pipeline is equipped with air inlet, according to by close to air inlet
It is disposed with the first vacuum meter, orifice flowmeter, the second vacuum meter, valve to the trend far from air inlet, on air inlet pipeline
First, pressure transmitter and check-valves, orifice flowmeter pass through flowmeter piping connection differential pressure transmitter；Single shaft Pendular ring type vacuum
Gas exhaust piping is additionally provided on pump, gas exhaust piping is connected to pressure vessel, and pressure vessel is equipped with exhaust outlet, overflow port and evacuation port,
Exhaust outlet, overflow port and evacuation port are controlled by valve second, valve fourth and valve third be opened and closed respectively；Liquid level is additionally provided on pressure vessel
Meter and pressure gauge.
Before operation, a certain amount of working solution is injected into single shaft liquid-ring vacuum pump, starts variable-frequency motor, variable-frequency motor
Single shaft liquid-ring vacuum pump is driven, rotates work done using the mechanism of positive displacement pump, gas medium is by air inlet through orifice flow
Meter, valve first and check-valves realize the course of work of air-breathing-compression-exhaust, gas by the variation of pump chamber into pump chamber
Medium carries under one's arms a small amount of working solution when being discharged from pump chamber, form gas-liquid mixed media, when entering pressure vessel through gas exhaust piping, gas-liquid
Separation, liquid medium fall under gravity into pressure vessel bottom, and gas medium is discharged through valve second from exhaust outlet, check-valves
It can prevent medium from flowing backwards.Liquid level gauge on pressure vessel shows the liquid level of pressure vessel, and the liquid level of pressure vessel is higher than excessive
When head piece, through the outside overflow of valve fourth, when liquid needs all emptyings in pressure vessel, valve third is opened, liquid can be from
Evacuation port is discharged.In the course of work, collected signal is passed to the Flow Meter Based in control centre by differential pressure transmitter, is led to
It crosses calculating output and shows that screen display, the information detected by vacuum meter, pressure transmitter pass to control in control centre
Center, the performance parameters such as vacuum degree, the speed of exhaust show screen display in control centre.The pressure vessel can be used as single shaft
The gas-liquid separator of liquid-ring vacuum pump uses, when single shaft liquid-ring vacuum pump makees liquid rotary compressor in use, pressure vessel
Also the pressure storing apparatus that can be used as single shaft Pendular ring type contracting machine has the function of " device two use ".Single shaft Pendular ring type vacuum
When pump is used as liquid rotary compressor, all valves on pressure vessel are closed, gas medium, which enters after pressure vessel, constantly to be compressed,
Pressure gauge set on pressure vessel top shows real-time pressure in pressure vessel.
Single shaft liquid-ring vacuum pump includes pump shaft, the pump housing, sealing cover, rear end pump cover and impeller, the pump housing and close
Capping is all made of macromolecule transparent material acrylic plastics and is made, and rear end pump cover is equipped with watch window.Through on the pump cover of rear end
Watch window and the pump housing, sealing cover, can from external clear convenient observation and shoot liquid rotary pump interior flow field feature and
Situation of change, can dispose high speed video camera close to rear end pump cover, be changed to pump housing flow field using laser irradiation imaging technique
It analyzes and researches.
The variable-frequency motor is connected by flexible coupling with single shaft liquid-ring vacuum pump.
Preferably, the flexible coupling is diaphragm coupling, and the shafting for being suitable for pump machines device is driven.
Preferably, the valve first is flange form butterfly valve, and flange form butterfly valve is no matter in the case of low temperature and high temperature,
With excellent sealing performance.
Preferably, the valve second is flange form butterfly valve.
Preferably, the check-valves is float type check valve.
Preferably, the valve third be to press from both sides ball valve, it is simple in structure, small, light-weight, have good fluid control
Characteristic processed.
Preferably, the valve fourth is to pressing from both sides ball valve.
Preferably, the liquid level is calculated as magnetic double level gauge, and magnetic double level gauge can be used for various towers, tank, slot, ball-type
The medium level sensing of the equipment such as container and boiler.
Possessed advantageous effect is the present invention compared with prior art：
(1) the rear end pump cover of single shaft liquid-ring vacuum pump of the present invention is equipped with watch window, single shaft Pendular ring type
The pump housing, the sealing cover of vacuum pump select macromolecule transparent material-acrylic plastics processing and manufacturing, through the observation on the pump cover of rear end
Window and the pump housing, sealing cover from outside is clear easily and can shoot the feature of liquid rotary pump interior flow field and change feelings
Condition can dispose high speed video camera close to rear end pump cover, be analyzed pump flow field variation using laser irradiation imaging technique
Research solves the key technology difficulty of liquid rotary pump biphase gas and liquid flow (mixed defeated) research platform, is provided for the exploitation of novel liquid rotary pump
Theoretical and technical foundation.
(2) orifice flowmeter is arranged in the present invention on air inlet pipeline, is transmitted collected signal by differential pressure transmitter
To the Flow Meter Based in control centre, by calculating output and showing screen display flow value in control centre, the present invention is also
The performance parameters such as vacuum degree, the speed of exhaust in pump operation can be provided in real time, it can to solve biphase gas and liquid flow in liquid rotary pump
Orifice plate integrated measuring technical problem depending on changing experimental provision operational process, realizes the automating of experimental bench, integrated monitoring.
(3) pressure vessel " device two use " of the present invention can not only be used for the air water point of single shaft liquid-ring vacuum pump
Structure is simplified, raw material have been saved, is reduced but also as the pressure storing apparatus of single shaft liquid-piston compressor from device
Space hold.
(4) single shaft liquid-ring vacuum pump is driven using variable-frequency motor, and output power can be according to liquid-ring vacuum pump
Different capacity demand is adjusted, and is realized energy-saving.
In conclusion the present invention can be used for the teaching and scientific experiment that biphase gas and liquid flow is analyzed in liquid-ring vacuum pump, can make
To study the scientific research method of CFD Fluid Mechanics Computations technology and experimental fluid mechanics, to improve, optimizing liquid rotary pump performance, from root
The efficiency of elevator pump provides important experimental data in sheet.The scientific experiment that multiphase fluid dynamics feature detects is can be applied to, is
Novel liquid rotary pump exploitation provides theoretical and technical foundation.
Description of the drawings
Fig. 1 is one of the overall structure diagram of the present invention；
Fig. 2 is the side view of Fig. 1；
Fig. 3 is the structural schematic diagram of single shaft liquid-ring vacuum pump in the present invention；
Fig. 4 is the side view of Fig. 3；
In figure：1, air inlet；2, air inlet pipeline；3, the first vacuum meter；4, orifice flowmeter；5, flowmeter pipeline；6,
Two vacuum meters；7, valve first；8, pressure transmitter；9, valve second；10, exhaust outlet；11, pressure vessel；12, check-valves；13, single
Shaft liquid-ring vacuum pump；14, valve third；15, flexible coupling；16, protective cover；17, chassis；18, variable-frequency motor；19, poor
Pressure transmitter；20, overflow port；21, valve fourth；22, liquid level gauge；23, pressure gauge；24, control centre；25, column second；26, it arranges
Air pipe；27, water supplying pump mouth；28, evacuation port；29, column first；30, pump shaft；31, the pump housing；32, sealing cover；33, rear end pump cover；
34, impeller；35, watch window；36, control centre's display screen.
Specific implementation mode
The present invention is described further with reference to embodiment：
As shown in figures 1-4, biphase gas and liquid flow visual experimental apparatus in liquid rotary pump of the present invention, including chassis 17
With control centre 24, control centre 24 is interior to be equipped with Flow Meter Based, and control centre 24 is arranged in column second 25；It is set on chassis 17
There are single shaft liquid-ring vacuum pump 13, single shaft liquid-ring vacuum pump 13 to be driven by variable-frequency motor 18, single shaft Pendular ring type vacuum
Pump 13 is equipped with air inlet pipeline 2, and air inlet pipeline 2 is equipped with air inlet 1, according to by close to air inlet 1 to walking far from air inlet 1
To being disposed with the first vacuum meter 3, orifice flowmeter 4, the second vacuum meter 6, (the flange form butterfly of valve first 7 on air inlet pipeline 2
Valve), pressure transmitter 8 and check-valves 12 (float type check valve), orifice flowmeter 4, which passes through flowmeter pipeline 5 and connects differential pressure, to be become
Device 19, air inlet pipeline 2 is sent to be supported by column first 29, differential pressure transmitter 19 is arranged in column first 29；Single shaft Pendular ring type vacuum
Gas exhaust piping 26 is additionally provided on pump 13, gas exhaust piping 26 is connected to pressure vessel 11, and pressure vessel 11 is equipped with exhaust outlet 10, overflow
Mouth 20 and evacuation port 28, exhaust outlet 10, overflow port 20 and evacuation port 28 are respectively by valve second 9 (flange form butterfly valve), valve fourth 21
(to pressing from both sides ball valve) and valve the third 14 (to pressing from both sides ball valve) control opening and closing；(the magnetic turning plate liquid level of liquid level gauge 22 is additionally provided on pressure vessel 11
Meter) and pressure gauge 23.
Single shaft liquid-ring vacuum pump 13 includes pump shaft 30, the pump housing 31, sealing cover 32, rear end pump cover 33 and impeller 34, pump
Body 31 and sealing cover 32 are all made of macromolecule transparent material acrylic plastics and are made, and rear end pump cover 33 is equipped with 4 watch windows
35.Through the watch window 35 and the pump housing 31, sealing cover 32 on rear end pump cover 33, from outside is clear easily and can clap
The feature and situation of change of single 13 interior flow field of shaft liquid-ring vacuum pump are taken the photograph, high-speed camera dress can be disposed close to rear end pump cover 33
It sets, is analyzed and researched to the variation of 31 flow field of the pump housing using laser irradiation imaging technique.
Variable-frequency motor 18 is connected by flexible coupling 15 (diaphragm coupling) with single shaft liquid-ring vacuum pump 13, Gu
High-speed rotating flexible coupling 15 (diaphragm coupling) is covered due to the protective cover 16 on chassis 17, to ensure operational safety.
The present invention the course of work or operation principle be：
Before operation, a certain amount of working solution is injected into single shaft liquid-ring vacuum pump 13 by water supplying pump mouth 27, is started
Variable-frequency motor 18 is driven by flexible coupling 15 (diaphragm coupling) and is revolved by the rotor part that pump shaft 30 and impeller 34 form
Turn, working solution is thrown to the inner wall formation pendular ring of the pump housing 31 by the blade of impeller 34, and the mechanism of positive displacement pump is utilized to rotate work done, gas
Body medium, through orifice flowmeter 4, valve first 7 (flange form butterfly valve), check-valves 12 (float type check valve), is entered by air inlet 1
Pump chamber realizes that the course of work of air-breathing-compression-exhaust, gas medium are carried under one's arms few when being discharged from pump chamber by the variation of pump chamber
Working solution is measured, gas-liquid mixed media is formed, when entering pressure vessel 11 through gas exhaust piping 26, gas-liquid separation, liquid medium is in weight
11 bottom of pressure vessel is fallen under force effect, gas medium is discharged through valve second 9 (flange form butterfly valve) from exhaust outlet 10, check-valves
12 (float type check valves) can prevent medium from flowing backwards.Liquid level gauge 22 (magnetic double level gauge) display pressure on pressure vessel 11
The liquid level of force container 11, when the liquid level of pressure vessel 11 is higher than overflow port 20, through the outside overflow (to pressing from both sides ball valve) of valve fourth 21, when
When liquid needs all emptyings in pressure vessel 11, valve the third 14 (to pressing from both sides ball valve) is opened, liquid can be discharged from evacuation port 28.
In the course of work, collected signal is passed to the Flow Meter Based in control centre 24 by differential pressure transmitter 19, passes through calculating
It exports and is shown on control centre's display screen 36, detected by the first vacuum meter 3, the second vacuum meter 6, pressure transmitter 8
Information passes to control centre 24, and the performance parameters such as vacuum degree, the speed of exhaust are shown on control centre's display screen 36.It is fixed on
Protective cover 16 on chassis 17 covers high-speed rotating flexible coupling 15 (diaphragm coupling), to ensure operational safety.Work
In the process, working solution will inject in time, to supplement consumption.
The gas-liquid separator that the pressure vessel 11 can be used as single shaft liquid-ring vacuum pump 13 uses, when single shaft pendular ring
Formula vacuum pump 13 makees compressor in use, pressure vessel 11 also can be used as the pressure storing apparatus of single shaft liquid-piston compressor,
Have the function of " device two use ".When single shaft liquid-ring vacuum pump 13 is used as compressor, the institute on pressure vessel 11 is closed
Have valve (i.e. valve second 9- flange forms butterfly valve, the third 14- of valve to folder ball valve and valve fourth 21- to press from both sides ball valve), gas medium into
It is constantly compressed after entering pressure vessel 11, the real-time pressure being set in the display pressure vessel 11 of pressure gauge 23 on 11 top of pressure vessel
Power.
The monitoring of biphase gas and liquid flow in performance and liquid rotary pump by principles above to realize liquid rotary pump.
Claims (10)
1. biphase gas and liquid flow visual experimental apparatus in a kind of liquid rotary pump, it is characterised in that：Including chassis (17) and control centre
(24), Flow Meter Based is equipped in control centre (24)；Chassis (17) is equipped with single shaft liquid-ring vacuum pump (13), single shaft
Liquid-ring vacuum pump (13) is driven by variable-frequency motor (18), and single shaft liquid-ring vacuum pump (13) is equipped with air inlet pipeline (2), into
Air pipe (2) is equipped with air inlet (1), according to by the trend close to air inlet (1) to separate air inlet (1), air inlet pipeline (2)
On be disposed with the first vacuum meter (3), orifice flowmeter (4), the second vacuum meter (6), valve first (7), pressure transmitter (8)
With check-valves (12), orifice flowmeter (4) connects differential pressure transmitter (19) by flowmeter pipeline (5)；Single shaft Pendular ring type is true
Gas exhaust piping (26) is additionally provided on sky pump (13), gas exhaust piping (26) is connected to pressure vessel (11), and pressure vessel (11) is equipped with
Exhaust outlet (10), overflow port (20) and evacuation port (28), exhaust outlet (10), overflow port (20) and evacuation port (28) are respectively by valve
Second (9), valve fourth (21) and valve third (14) control opening and closing；Liquid level gauge (22) and pressure gauge are additionally provided on pressure vessel (11)
(23)。
2. biphase gas and liquid flow visual experimental apparatus in liquid rotary pump according to claim 1, it is characterised in that：The list
Shaft liquid-ring vacuum pump (13) includes pump shaft (30), the pump housing (31), sealing cover (32), rear end pump cover (33) and impeller (34),
The pump housing (31) and sealing cover (32) are all made of macromolecule transparent material acrylic plastics and are made, and rear end pump cover (33) is equipped with observation
Window (35).
3. biphase gas and liquid flow visual experimental apparatus in liquid rotary pump according to claim 1, it is characterised in that：The change
Frequency motor (18) is connected by flexible coupling (15) with single shaft liquid-ring vacuum pump (13).
4. biphase gas and liquid flow visual experimental apparatus in liquid rotary pump according to claim 3, it is characterised in that：Described scratches
Property shaft coupling (15) be diaphragm coupling.
5. biphase gas and liquid flow visual experimental apparatus in liquid rotary pump according to claim 1, it is characterised in that：The valve
Door first (7) is flange form butterfly valve.
6. biphase gas and liquid flow visual experimental apparatus in liquid rotary pump according to claim 1, it is characterised in that：The valve
Door second (9) is flange form butterfly valve.
7. biphase gas and liquid flow visual experimental apparatus in liquid rotary pump according to claim 1, it is characterised in that：Described stops
It is float type check valve to return valve (12).
8. biphase gas and liquid flow visual experimental apparatus in liquid rotary pump according to claim 1, it is characterised in that：The valve
Third (14) of door are to pressing from both sides ball valve.
9. biphase gas and liquid flow visual experimental apparatus in liquid rotary pump according to claim 1, it is characterised in that：The valve
Gatekeeper (21) is to pressing from both sides ball valve.
10. biphase gas and liquid flow visual experimental apparatus in liquid rotary pump according to claim 1, it is characterised in that：Described
Liquid level gauge (22) is magnetic double level gauge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810633389.1A CN108571449A (en) | 2018-06-20 | 2018-06-20 | Biphase gas and liquid flow visual experimental apparatus in liquid rotary pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810633389.1A CN108571449A (en) | 2018-06-20 | 2018-06-20 | Biphase gas and liquid flow visual experimental apparatus in liquid rotary pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108571449A true CN108571449A (en) | 2018-09-25 |
Family
ID=63573339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810633389.1A Withdrawn CN108571449A (en) | 2018-06-20 | 2018-06-20 | Biphase gas and liquid flow visual experimental apparatus in liquid rotary pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108571449A (en) |
-
2018
- 2018-06-20 CN CN201810633389.1A patent/CN108571449A/en not_active Withdrawn
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180925 |
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| WW01 | Invention patent application withdrawn after publication |