CN206071889U - A kind of low noise self-priming combination pump - Google Patents
A kind of low noise self-priming combination pump Download PDFInfo
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- CN206071889U CN206071889U CN201621046303.8U CN201621046303U CN206071889U CN 206071889 U CN206071889 U CN 206071889U CN 201621046303 U CN201621046303 U CN 201621046303U CN 206071889 U CN206071889 U CN 206071889U
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Abstract
The utility model discloses a kind of low noise self-priming combination pump.This utility model removes the diffusion stator and flow guiding disc of traditional self-suction injection pump, then using hydraulic performance and single cut water in hgher efficiency, single outlet or many cut waters, multiple exit centrifugation volute casing, design singly enters formula runner and the fluid being centrifuged after speedup is rationally drained to shunting pumping chamber or diversion three-way, inherently eliminate stator, flow guiding disc and centrifugal impeller scrapes severe impact of the scrape along high-velocity fluid to stator flow guiding disc, make the transition flow between centrifugation volute casing and shunting pumping chamber or diversion three-way more smoothly, flow losses and flow noise are less；The reasonable Arrangement for singly entering formula runner can ensure the without interruption of nozzle entrance section working fluid, so as to keep negative pressure to obtain powerful suction capacity；This utility model can adopt diversion three-way to replace the shunting pumping chamber of traditional large volume, make structure compacter.
Description
Technical field
This utility model is related to a kind of centrifugal atomization combination pump, more particularly to a kind of formula self-priming that singly enters for reducing noise is combined
Pump, belongs to field of fluid machinery.
Background technology
Pump is a kind of abundance, universal fluid machinery of many uses and huge to energy requirement.It is by prime mover
Liquid is transmitted in mechanical energy or other energy parts, and increases the mechanical energy of liquid, conveys and is pressurized liquid so as to reach
Purpose.Self-suction injection pump is also referred to as jet pump（self-priming jet-pump）, jet pump structure is simple, service behaviour
It is reliable, it is widely used in the fields such as machinery, metallurgy, chemical industry, oil, naval vessel, light industry papermaking and agricultural.Ejector pump and peripheral pump
Compare that suction is strong, self-priming is stable, efficiency high, be a kind of pump class product having a large capacity and a wide range.
Early in the sixties in 19th century, German scholar Zeuner just establishes the design theory of ejector pump using momentum theorem,
And the theoretical basiss of jet pump have been established in 19 end of the centurys, but problem is not thoroughly solved.Wuhan Water Conservancy and Electric Power Univ of China
Lu Hong folding professors in its works to the nineties in last century before numerous scholars it is prominent in terms of the application and research of ejector pump
Going out work has carried out detailed review.Even so, the research of above-mentioned domestic and international ejector pump is only wrapped all just for pure ejector pump
Containing an ejector（It is made up of nozzle, trunnion and anemostat）Jet pump, be different from China's pump industry known to small-sized spray
Penetrate pump（Several hectowatts to thousands of watts）, i.e., the ingenious combination of one centrifugal pump and an ejector pump sees Conery W. J. earliest
In nineteen forty-two invention disclosed (Combination centrifugal ejector pump/Shallow well self-
Priming jet pump), subsequent Conery W. J. and other scholars have carried out continuous improvement to this pump.This practicality is new
Ejector pump alleged by type refers to the pump of this type.It is similarly modified and is continued until the mid-90 in last century, mainly to ejector
With the adjustment carried out on the arrangement of centrifugal impeller, but all the time retain centrifugal impeller stator and flow guiding disc, using centrifugation leaf
The fluid pressure itself extrusion fluid that wheel outlet is flowed out enters from impeller inlet side or motor side wraparound impeller along stator, flow guiding disc
Mouthful side enters back into water-supplying chamber, and this mode flow resistance for entering shunting pumping chamber is very big, and with obvious flow noise and
Mechanicalness noise.
The basic functional principle of ejector pump is to enter shunting after working fluid obtains kinetic energy under centrifugal impeller high-speed rotation
Pumping chamber, speed decline rapidly and are converted into pressure, and a part of high-pressure fluid Jing nozzle at high speeds for shunting pumping chamber sprays, in spray
Mouth is exported and produces a very strong negative pressuren zone, the fluid near import due to the high-speed motion of fluid（Gas and water or gas-liquid two-phase
Stream）Constantly be inhaled in the presence of this negative pressure, anemostat is injected simultaneously together with pressurized working fluid near jet expansion
Be sufficiently mixed, most after Jing Centrifugal Impeller Inlets enter impeller, under the centrifugal action of centrifugal impeller again be pressurized after by leaf
Wheel exit guide blade and flow guiding disc water conservancy diversion enter shunting pumping chamber, and the supercharging that most of high-pressure fluid Jing outlets outflow completes fluid is defeated
Send, another part then repeats said process and is recycled into nozzle, forms jet entrainment and is inhaled fluid, and this segment fluid flow referred to as works
Fluid.From the operation principle of above-mentioned ejector pump, self-suction injection pump is substantially the centrifugal pump with fixed guide vane and tradition
Without leaf jet pump（Ejector pump）Combination, i.e. core component includes ejector, centrifugal impeller and centrifugation pumping chamber.The leaf of ejector pump
The double shrouded wheel of wheel actually centrifugal pump, supercharging mode of the fluid under centrifugal impeller effect are identical with centrifugal pump, i.e. leaf
Wheel rotation makes water be thrown toward vane edge under the influence of centrifugal force；The pressurized working fluid of ejector is pressurized to by centrifugal impeller
The part offer of the fluid of shunting pumping chamber.
The noise for comparing this kind of ejector pump of centrifugal pump of Same Efficieney is much higher, the ejector pump noise of general 1kw or so
In 70 ~ 80 decibels of even more highs.Specifically, the noise source of this kind of ejector pump at a high speed rotarily drives stream mainly due to impeller
When body rotates at a high speed and throws away impeller outlet under the action of the centrifugal force, impact stator, flow guiding disc and inner walls produce larger
Hydrodynamic noise, therefore and impeller can produce resonance and cause to occur to scrape between impeller and stator under a certain flow point.
From in operation principle, ejector pump compares the self priming pump of ad eundem（Peripheral pump）Or small-size centrifugal pump have it is more powerful, more
Stable suction and outstanding flow and lift, it will be apparent that big, user's body that deficiency is that the noise of ejector pump compares latter two pump
Test not good enough, also therefore temporarily cannot be introduced into needing the working environment of low noise, and it is more empty loaded on outdoor or away from people activities
Between, huge market potential cannot discharge.Operation principle of this utility model according to self-suction injection pump, with reference to its flow behavior
A kind of low-noise combination pump is proposed, on the basis of the advantage performances such as its flow, lift, self-priming are ensured, spray is effectively reduced
Pump noise is penetrated, expands its scope of application, excavate its market potential.
The content of the invention
For existing injection pump operation noise is big, fluid enters the deficiency that shunting pumping chamber flowing has some setbacks, this practicality is newly
The purpose of type is to provide a kind of noise reduction significantly, and the service behaviour such as flow, lift, suction is comprehensive, the high centrifugation of feasibility
Injection combination pump.
To achieve these goals, the technical solution adopted in the utility model is：
The diffusion stator and flow guiding disc of self-suction injection pump are substituted by this utility model using centrifugation volute casing, and design singly enters formula
Runner is by the fluid conduction being centrifuged after speedup to shunting pumping chamber or diversion three-way；Specifically：
One end of centrifugation volute casing is connected with centrifugal impeller outlet, and other end connection singly enters formula runner, by singly entering formula runner
It is connected with shunting pumping chamber or diversion three-way afterwards；Described centrifugation volute casing carries cut water, and each cut water outlet connection one singly enters
Formula runner.
Furtherly, singly enter formula runner hydraulic diameter for 0.1～10.0D 0,D 0To be centrifuged at volute casing cut water perpendicular to centrifugation
The hydraulic diameter in the section of runner exit section runner centrage.
Furtherly, singly enter the combination that formula runner is straight tube, corner bevelling pipe, inclined tube, helical curve spool or above-mentioned shape pipeline.
Furtherly, singly enter formula runner exit to be directly tightly connected with diversion three-way or in shunting pumping chamber apart from nozzle
Entrance entrance 0.1D~10.0D,DSingly to enter formula runner exit hydraulic diameter.
Furtherly, it is 90 ° ~ 270 ° to shunt pumping chamber or the Way out of diversion three-way with the angle of gravity direction.
Furtherly, shunt pumping chamber to be tightly connected with the outside wall surface of centrifugation volute casing inlet side or casting guarantee integrated therewith
Sealing.
Furtherly, in combination pump nozzle and anemostat composition ejector, ejector flow to central axis with centrifugation leaf
Wheel Pivot axle is vertical.
Furtherly, described centrifugation volute casing is many cut water multiple exits, and each connection of each outlet one singly enters formula runner, single
Enter formula runner and shunting pumping chamber or diversion three-way after converging, can be entered back into, also can by it is each singly enter formula runner individually with shunting pumping chamber
Or diversion three-way connection.
By using above technical scheme, having an advantageous effect in that：
1st, volute casing is centrifuged and adopts single cut water, single outlet or multiple exit, many cut water runners, and it is gently smooth by formula runner is singly entered
Ground connection centrifugation volute casing and shunting pumping chamber or diversion three-way, are different from conventional spray pump and leaf will be centrifuged using stator and flow guiding disc
Wheel outlet fluid is vertically squeezed into shunting the mode of pumping chamber from multiple diffusion runners, therefore flow losses are big with flow noise
Big to cut down, it is to avoid the collision of conventional spray pump stator, flow guiding disc and centrifugal impeller, to scrape, the machinery for reducing pump operation makes an uproar
Sound, fundamentally solves the problems, such as that centrifugal impeller outlet high-velocity fluid clashes into the hydrodynamic noise and flow losses of stator, prevents
The impeller that may cause under a certain flow point or flow guiding disc, stator resonance, remain the big flow of ejector pump, the work such as high-lift
While characteristic, the scope of application of combination pump is expanded, in particular for the working environment of low noise.
2nd, when substantially integral fluid flow pumping chamber direct substitution using diversion three-way, cost and pump housing weight are cast significantly not only
Reduce, and pump housing volume fully can reduce so that the structure of combination pump is compacter, light, energy-conservation, manufacturing process is more simple
Just.
3rd, when ejector flows to axis and centrifugal rotation central axis are arranged, combination pump is in centrifugal impeller center of rotation
Size on axis direction is greatly reduced, therefore the pump housing size of combination pump further can reduce, and make combination pump overall structure
It is further compact.
4th, when using shunting pumping chamber as working fluid storage chamber, reasonable Arrangement list enters formula runner and centrifugation volute casing is increased
High-velocity fluid part after speed is guided to away from nozzle entrance section entrance 0.1D～10.0D, make flowing in shunting pumping chamber more
Optimization, cuts down invalid backflow and eddy flow, has both ensured the working fluid supply nozzle of abundance to obtain powerful suction capacity, and energy
Obtain under equal conditions, the metered flow higher than conventional spray pump；
5th, the mode for singly entering formula runner connection centrifugation volute casing and shunting pumping chamber or diversion three-way causes the processing of combination pump
Manufacturing process feasibility is strong, and industrialization prospect is good.
Description of the drawings
Fig. 1 be this utility model low noise self-priming combination pump using shunting pumping chamber, single cut water, single outlet centrifugation volute casing and
Structural profile schematic diagram when ejector is parallel with impeller Pivot axle；
Fig. 2 be this utility model low noise self-priming combination pump using shunting pumping chamber, single cut water, single outlet centrifugation volute casing and
Structural profile schematic diagram when ejector is vertical with impeller Pivot axle；
Fig. 3 is this utility model low noise self-priming combination pump using diversion three-way, single cut water, single outlet centrifugation volute casing and spray
Structural profile schematic diagram when emitter is vertical with impeller Pivot axle；
Fig. 4 is the cross-sectional view of traditional self-suction injection pump stator, stator disk and flow guiding disc.
In figure：1st, singly enter formula runner；2nd, anemostat；3rd, singly enter formula runner exit；4th, nozzle entrance section entrance；5th, nozzle；
6th, it is combined pump intake；7th, volute casing is centrifuged；8th, it is combined pump discharge；9th, volute casing cut water is centrifuged；10th, centrifugal impeller；11st, centrifugal impeller enters
Mouthful；12nd, motor；13rd, shunt pumping chamber；14th, diversion three-way；15th, ejector pump stator disk；16th, ejector pump stator；17th, ejector pump
Flow guiding disc.
Specific embodiment
In order that those skilled in the art more fully understand the technical scheme in this utility model, below in conjunction with this reality
With the accompanying drawing in new, clear, complete description is carried out to the technical scheme in utility model, it is clear that described is only this
The a part of embodiment of utility model, rather than the embodiment of whole.Based on the embodiment of utility model, ordinary skill people
The every other embodiment obtained under the premise of creative work is not made by member, should all belong to the model of utility model protection
Enclose.
As shown in Figure 1 to Figure 3, this utility model adopts single cut water, single outlet or many cut waters, the centrifugation volute casing of multiple exit,
Singly enter formula and design the direct-connected shunting pumping chamber of i.e. single smooth runner or diversion three-way, conventional spray pump is different from using stator and is led
Centrifugal impeller is exported fluid and is vertically squeezed into by force shunting the side of pumping chamber or diversion three-way from multiple diffusion runners by flow table
Formula, at the same remain ejector pump compact overall structure, the characteristics of integrated degree is high；It is specific singly to enter formula runner while centrifugation
High-velocity fluid after volute casing speedup is guided to nozzle entrance section entrance, it is ensured that sufficient working fluid enters nozzle to obtain
Powerful suction capacity, and thus reasonable distribution shunts the flowing in pumping chamber；Centrifugation volute casing speedup after fluid Jing it is mono- enter formula
Runner can be directly entered diversion three-way and be shunted or aerofluxuss, and shunting pumping chamber, the more compact conjunction of structure are not set under this scheme
Reason.
This utility model basic functional principle：In combination pump, a part of fluid is in the case where impeller is rotarily driven at a high speed（Impeller by
Motor 12 drives）, singly enter after formula runner via it is diverted through for volute casing cut water of centrifugation after obtaining kinetic energy under the influence of centrifugal force
Gently, shunting pumping chamber or diversion three-way are swimmingly entered, converts kinetic energy into pressure potential.Therefore avoid conventional spray pump
The collision of stator and centrifugal impeller, scrape scrape along high velocity fluid strikes stator, the hydrodynamic noise of flow guiding disc and flow losses.Into point
The fluid of stream pumping chamber（High speed or high pressure）Compound pump discharge 8 is flowed out in the outlet of a part of Jing shuntings pumping chamber or diversion three-way outlet
Conveying is completed, another part is directly entered the subsonic speed or ultrasonic jet of nozzle formation as working fluid.Then in spray
An extremely strong negative pressure is produced near mouth outlet high-velocity fluid, therefore the fluid of being inhaled for being combined pump intake is inhaled and high speed operation by volume
Fluid is injected into anemostat mixing together.The fluid of mixing carries out similar multistage from Centrifugal Impeller Inlet 11 into centrifugal impeller
The secondary booster of pump, then centrifugation volute casing cut water near throw away impeller, most after Jing it is mono- enter formula runner return shunting pumping chamber
Or diversion three-way, a portion is again introduced into nozzle entrance section as working fluid, and another part discharges the pump housing, so circulates
Back and forth, go round and begin again.When ejector pump is in self-priming exhaust phase, the fluid of being inhaled of entrance is gas, in the strong negative pressure of jet expansion
In the presence of together with the working fluid of inoculated after jet expansion confluxes, mixes in anemostat into impeller accelerate, and after Jing
Singly enter formula runner and be not recycled into this portion of combined stream body of nozzle and be detained in shunting pumping chamber or diversion three-way, due to bubble
Floating occur gas-liquid separation, complete aerofluxuss and realize self-priming.
It is described inhaled fluid be gas and water or other fluids and its with the short grained mixture of gas and solid；Working fluid is
Pure water or other fluid liquids and its with the short grained mixture of gas and solid.
Described singly enters formula runner hydraulic diameter for 0.1～10.0D 0, equal diameter or variable diameters, circular section or not rounded are cut
Face,D 0For the hydraulic diameter perpendicular to the section of centrifugation runner exit section runner centrage is centrifuged at volute casing cut water.
Described singly enters formula runner for straight tube, corner bevelling pipe, inclined tube, helical curve spool, random-space-curve shape pipe or above-mentioned
The combination of shape pipeline.
The described formula runner exit 3 that singly enters directly is tightly connected with diversion three-way or is entered apart from nozzle in shunting pumping chamber
Mouth section entrance 4 0.1D～10.0D,DSingly to enter formula runner exit hydraulic diameter.
The Way out of the shunting pumping chamber or diversion three-way is 90 °～270 ° with the angle of gravity direction.
The shunting pumping chamber is tightly connected with the outside wall surface of centrifugation volute casing inlet side or casting guarantee sealing integrated therewith.
Described nozzle and anemostat composition ejector, ejector flows to central axis can be with centrifugal impeller Pivot axle
Parallel, vertical or inclination；
Described centrifugation volute casing is single cut water, single outlet or many cut water multiple exits, and each connection of each outlet one singly enters formula
Runner, singly enters formula runner and shunting pumping chamber or diversion three-way can be entered back into after converging, also can by it is each singly enter formula runner individually with point
Stream pumping chamber or diversion three-way connection.
Embodiment：When the low noise self-priming of the present embodiment is combined pump work, in combination pump centrifugation volute casing 7, a part of fluid exists
10 high speed of centrifugal impeller rotarily drives down, leads to via the shunting of centrifugation volute casing cut water 9 after obtaining kinetic energy under the influence of centrifugal force
Crossing, and make rapidly kinetic energy be converted into pressure
Potential energy.Therefore avoid the collision of stator and centrifugal impeller 10 on conventional spray pump stator disk 15, scrape the punching of scrape along high-velocity fluid
Ejector pump stator 16, the hydrodynamic noise of ejector pump flow guiding disc 17 and flow losses are hit, Fig. 4 is seen.Into shunting pumping chamber 13 or point
The fluid of stream threeway 14（High speed or high pressure）A part of Jing shuntings pumping chamber 13 is exported or combination pump is flowed out in the outlet of diversion three-way 14
Conveying is completed, another part is directly entered the subsonic speed or ultrasonic jet of the formation of nozzle 5 as working fluid.Then in spray
An extremely strong negative pressure is produced near mouth outlet high-velocity fluid, therefore the fluid of being inhaled for being combined pump intake is inhaled and high speed operation by volume
Fluid is injected into anemostat 2 together and mixes.The fluid of mixing carries out similar many from 10 entrance of centrifugal impeller into centrifugal impeller
Level pump secondary booster, then centrifugation volute casing 7 cut water near throw away impeller, most after Jing it is mono- enter formula runner return shunting pressure water
Room 13 or diversion three-way 14, a portion are again introduced into nozzle entrance section as working fluid, and another part discharges the pump housing, such as
This moves in circles, and goes round and begins again.When ejector pump is in self-priming exhaust phase, the fluid of being inhaled for being combined pump intake 6 is gas, in spray
Mouth enters leaf in the presence of exporting strong negative pressure after the outlet of nozzle 5 is confluxed, mixed in anemostat 2 together with the working fluid of inoculated
Wheel accelerates, and after Jing it is mono- enter formula runner 1 be not recycled into this portion of combined stream body of nozzle in shunting pumping chamber 13 or shunting three
It is detained in logical 14, as the floating of bubble occurs gas-liquid separation, completes aerofluxuss and realize self-priming.
Specific embodiment of the present utility model is described above in association with accompanying drawing, but these explanations can not be understood to
Scope of the present utility model is limited, protection domain of the present utility model is limited by appended claims, any in this reality
All it is protection domain of the present utility model with the change on the basis of new claim.
Claims (8)
1. a kind of low noise self-priming combination pump, it is characterised in that：By the diffusion stator and flow guiding disc of self-suction injection pump, using centrifugation
Volute casing is substituted, and design singly enters formula runner by the fluid conduction being centrifuged after speedup to shunting pumping chamber or diversion three-way；Specifically：
One end and centrifugal impeller outlet of centrifugation volute casing be connected, and the other end connects and singly enters formula runner, after singly entering formula runner and
Shunting pumping chamber or diversion three-way connection；Described centrifugation volute casing carries cut water, and each cut water outlet connection one singly enters formula stream
Road.
2. a kind of low noise self-priming combination pump according to claim 1, it is characterised in that：Singly entering formula runner hydraulic diameter is
0.1～10.0D 0,D 0For the hydraulic diameter perpendicular to the section of centrifugation runner exit section runner centrage is centrifuged at volute casing cut water.
3. a kind of low noise self-priming combination pump according to claim 1, it is characterised in that：Singly enter formula runner for straight tube, circle
The combination of bend pipe, inclined tube, helical curve spool or above-mentioned shape pipeline.
4. a kind of low noise self-priming combination pump according to claim 1, it is characterised in that：Singly enter formula runner exit directly with
Diversion three-way is tightly connected or in shunting pumping chamber apart from nozzle entrance section entrance 0.1D~10.0D,DGo out singly to enter formula runner
Mouth hydraulic diameter.
5. a kind of low noise self-priming combination pump according to claim 1, it is characterised in that：Shunting pumping chamber or diversion three-way
The angle of Way out and gravity direction be 90 ° ~ 270 °.
6. a kind of low noise self-priming combination pump according to claim 1, it is characterised in that：Shunting pumping chamber and centrifugation volute casing
The outside wall surface of inlet side is tightly connected or casting integrated therewith ensures sealing.
7. a kind of low noise self-priming combination pump according to claim 1, it is characterised in that：Nozzle and diffusion in combination pump
Pipe constitutes ejector, and it is vertical with centrifugal impeller Pivot axle that ejector flows to central axis.
8. a kind of low noise self-priming combination pump according to claim 1, it is characterised in that：Described centrifugation volute casing for it is many every
Tongue multiple exit, each connection of each outlet one singly enter formula runner, singly enter formula runner and shunting pumping chamber can be entered back into after converging or is divided
Stream threeway, also can by it is each singly enter formula runner individually with shunting pumping chamber or diversion three-way be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621046303.8U CN206071889U (en) | 2016-09-09 | 2016-09-09 | A kind of low noise self-priming combination pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621046303.8U CN206071889U (en) | 2016-09-09 | 2016-09-09 | A kind of low noise self-priming combination pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206071889U true CN206071889U (en) | 2017-04-05 |
Family
ID=58437273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621046303.8U Withdrawn - After Issue CN206071889U (en) | 2016-09-09 | 2016-09-09 | A kind of low noise self-priming combination pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206071889U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106224249A (en) * | 2016-09-09 | 2016-12-14 | 浙江新控泵业有限公司 | Low noise self-priming combination pump |
| CN106930950A (en) * | 2017-04-30 | 2017-07-07 | 浙江新控泵业有限公司 | Speed variable low noise self-priming combination pump |
| WO2019223047A1 (en) * | 2018-05-25 | 2019-11-28 | 苏州优德通力科技有限公司 | Anhydrous self-priming super-silent intelligent water pump for distinguishing water flow |
-
2016
- 2016-09-09 CN CN201621046303.8U patent/CN206071889U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106224249A (en) * | 2016-09-09 | 2016-12-14 | 浙江新控泵业有限公司 | Low noise self-priming combination pump |
| WO2018045606A1 (en) * | 2016-09-09 | 2018-03-15 | 浙江新控泵业有限公司 | Low-noise, self-priming and composite pump |
| CN106930950A (en) * | 2017-04-30 | 2017-07-07 | 浙江新控泵业有限公司 | Speed variable low noise self-priming combination pump |
| WO2019223047A1 (en) * | 2018-05-25 | 2019-11-28 | 苏州优德通力科技有限公司 | Anhydrous self-priming super-silent intelligent water pump for distinguishing water flow |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170405 Effective date of abandoning: 20171103 |