CN109026750A - A kind of mute energy-saving water pump - Google Patents
A kind of mute energy-saving water pump Download PDFInfo
- Publication number
- CN109026750A CN109026750A CN201811054540.2A CN201811054540A CN109026750A CN 109026750 A CN109026750 A CN 109026750A CN 201811054540 A CN201811054540 A CN 201811054540A CN 109026750 A CN109026750 A CN 109026750A
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- CN
- China
- Prior art keywords
- water
- bracket
- water pump
- baffle
- motor
- 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.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/086—Sealings especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A kind of mute energy-saving water pump, comprising: motor, bracket, water pump outer cylinder；Motor includes rear end cap, water cooled housing, drive end bearing bracket；Rear end cap is equipped with runner；Cavity is equipped with inside water cooled housing, cavity is connected with runner；The upper end of drive end bearing bracket connecting bracket, the center connect shaft coupling, and shaft coupling is set to the inside of bracket；Bracket is the attachment device with water outlet, and lower end connects the upper end of water pump outer cylinder；Internal stent is symmetrically arranged with water inlet pipe, outlet pipe, and water inlet pipe, outlet pipe are connected with two cavitys respectively；The middle and upper part of water pump outer cylinder is equipped with water inlet, and inside is equipped with support frame, baffle, pump shaft, and lower end connects pedestal；The upper end of pump shaft connects shaft coupling, and lower end connects support frame；Mechanical seal is equipped between pump shaft and bracket；Baffle is set on pump shaft, and the inside of baffle is equipped with impeller.The present invention reduces the noise of motor by the way of water cooling.The present invention also use in into it is upper go out Inlet and outlet water mode, extend the service life of equipment.
Description
Technical field
The present invention relates to vertical multi-stage centrifugal pump technical fields, and in particular to a kind of mute energy-saving water pump.
Background technique
Traditional air-cooled induction machine centrifugal multistage pump multiple centrifugal pump noise is big, loss is high, and it is higher to be no longer satisfied noise requirements
Occasion is especially in living water application；And its structure is complicated, water pump inlet capacity is not high, causes cavitation erosion and mechanical seal
The phenomenon that dry grinding, reduces the service life of equipment.
Summary of the invention
To solve above-mentioned problems of the prior art, the present invention provides a kind of mute energy-saving water pump, by motor
The improvement of the type of cooling and water pump intake-outlet greatly reduces noise when water pump operation, prevents cavitation erosion and mechanical seal dry
The appearance for grinding phenomenon, extends the service life of equipment.
A kind of mute energy-saving water pump characterized by comprising motor, bracket, water pump outer cylinder；
The motor includes rear end cap, water cooled housing, drive end bearing bracket, and three collectively constitutes the shell of the motor；After described
End cap includes upper rear end cap, lower rear end cap, and is equipped with single cycle runner therebetween；The internal vertical of the water cooled housing is symmetrical
Equipped with cavity, the cavity has been connected to form the cooling water pipeline of the motor with the single cycle runner；
The drive end bearing bracket connects the upper end of the bracket, connects shaft coupling, the shaft coupling at the center of the drive end bearing bracket
Set on the inside of the bracket；
The bracket is the attachment device with water outlet, and lower end connects the upper end of the water pump outer cylinder；
The internal stent is symmetrically arranged with water inlet pipe, outlet pipe, and the upper end of the water inlet pipe connects the lower end of the cavity,
The upper end of the outlet pipe connects the lower end of another cavity；
The water pump outer cylinder is hollow cylindrical structure, and middle and upper part is equipped with water inlet, and inside is equipped with support frame, water conservancy diversion
Body, pump shaft, lower end connect pedestal；
The upper end of the pump shaft connects the shaft coupling, and lower end connects support frame as described above；
Mechanical seal is equipped between the pump shaft and the bracket；
The baffle is set on the pump shaft, and the inside of the baffle is equipped with impeller.
Further, the motor is efficient permanent magnet motor, also includes rotor, bearing, stator winding；The stator winding
Through the inside for being set to the water cooled housing, the rotor is set to the inside of the stator winding, and the both ends of the rotor are equipped with
Bearing.
Further, between the upper rear end cap and the lower rear end cap be equipped with sealing ring, the water cooled housing with it is described
Gasket is equipped between lower rear end cap, the drive end bearing bracket.
Further, the water outlet is connected at the lower end of the water inlet pipe, the lower end of the outlet pipe connects the water
Pump the inside of outer cylinder.
Further, the water inlet, water outlet are formed into upper structure out in one, and the water outlet can be with respect to institute
State circumferential 360 ° any rotations of water inlet.
Further, the baffle includes chopped-off head baffle, submerged bearing baffle, multiple second level baffles.
Further, support frame as described above, chopped-off head baffle, submerged bearing baffle, second level baffle are successively set from the bottom up
It sets.
Further, it is connected between the submerged bearing baffle and the pump shaft with guide bearing.
Further, O-ring is provided between the water pump outer cylinder and the bracket, the pedestal.
Further, pull rod is provided between the bracket and the pedestal.
Compared with prior art, protrusion technical effect of the invention are as follows: a kind of mute energy-saving water pump of the invention just has water
Cold mode replaces traditional air cooling way, while using efficient permanent magnet motor, greatly reduces noise when motor operation, mentions
High working efficiency.In addition, the present invention also use in into it is upper go out Inlet and outlet water mode, it is therefore prevented that cavitation erosion and mechanical seal dry grinding are existing
The generation of elephant, and structure is simple, extends the service life of equipment, reduces costs.
Detailed description of the invention
Fig. 1 is a kind of mute energy-saving water pump structure schematic diagram of the present embodiment；
Fig. 2 is the electric machine structure schematic diagram in Fig. 1；
Fig. 3 is the supporting structure schematic diagram in Fig. 1；
Fig. 4 is the water pump outer tube structure schematic diagram in Fig. 1.
In figure: 1-- motor, 2-- outlet pipe, 3-- mechanical seal, 4-- bracket, 5-- pull rod, 6-- water inlet, 7-- water pump
Outer cylinder, 8-- chopped-off head baffle, 9-- guide bearing, 10-- pedestal, 11-- water inlet pipe, 12-- water outlet, 13-- shaft coupling, 14-- pump
Axis, 15-- impeller, 16-- second level baffle, 17-- submerged bearing baffle, 18-- support frame, 19--O type circle, 101-upper rear ends
Lid, 102-- sealing ring, 103-lower rear end caps, 104-gaskets, 105-- rotor, 106-- bearing, 107-- stator winding,
108-- water cooled housing, 109-- drive end bearing bracket.
Specific embodiment
Technical solution of the present invention is described in further detail below in conjunction with Figure of description.
As shown in Figs 1-4, a kind of mute energy-saving water pump, comprising: motor 1, bracket 4, water pump outer cylinder 7；
Specifically, motor 1 includes rear end cap, water cooled housing 108, drive end bearing bracket 109, and three collectively constitutes the shell of motor 1；
Rear end cap includes upper rear end cap 101, lower rear end cap 103, and is equipped with single cycle runner therebetween；Water cooled housing 108 be with
Certain thickness hollow structure, internal vertical are set there are two cavity, and two cavitys are symmetrical arranged, and cavity is connected group with runner
At the cooling water pipeline of motor 1；
That is, water enters from the lower end of a cavity, by single cycle runner, another cavity is flowed into, finally from another
It flows out the lower end of cavity；The cooling water pipeline for foring an one-way flow in the body of motor 1 as a result, is existed by cooling water
The body circulation of motor 1 comes for the cooling of motor 1, and not only effective protection motor 1 is not influenced by high temperature, and greatly reduces motor
Noise when 1 operation；And cooled down with water, energy conservation and environmental protection；
The upper end of 109 connecting bracket 4 of drive end bearing bracket, shaft coupling 13 is connected at the center of drive end bearing bracket 109, and shaft coupling 13 is set to branch
The inside of frame 4；
Bracket 4 is the attachment device with water outlet 12, and lower end connects the upper end of water pump outer cylinder 7；
4 internal symmetry of bracket is equipped with water inlet pipe 11, outlet pipe 2, and the upper end of water inlet pipe 11 connects the lower end of a cavity, water outlet
The upper end of pipe 2 connects the lower end of another cavity；
Water pump outer cylinder 7 is hollow cylindrical structure, and its external both sides size is less than its inside dimension；Water pump outer cylinder 7
Middle and upper part be equipped with water inlet 6, inside be equipped with support frame 18, baffle, pump shaft 14, lower end connect pedestal 10；
The upper end of pump shaft 14 connects shaft coupling 13, and lower end connects support frame 18；Motor 1 is transmitted torque by shaft coupling 13
To pump shaft 14, support frame 18 is used to support pump shaft 14 and baffle.
Mechanical seal 3 is equipped between pump shaft 14 and bracket 4, mechanical seal 3 is used for connecting bracket 4 and pump shaft 14, prevents water
It is penetrated into motor 1, it is damaged, while also ensuring the leakproofness inside water pump by bracket 4 and 14 junction of pump shaft, protected
The leakproofness of water pump is demonstrate,proved；
Baffle is set on pump shaft 14, and the inside of baffle is equipped with impeller 15；Baffle is for carrying impeller 15 and leading
Flowing water, impeller 15 pump shaft 14 driving under along pump shaft 14 rotate, and by the kinetic energy of itself transmit water supply, water receive kinetic energy after by its
It is converted into potential energy, increases pressure itself, and then enters next stage baffle.
Preferably, motor 1 is efficient permanent magnet motor, also includes rotor 105, bearing 106, stator winding 107；Stator around
Group 107 is set to the inside of stator winding 107 through the inside set on water cooled housing 108, rotor 105, and the both ends of rotor 105 are equipped with
Bearing 106.Efficient permanent magnet motor is high-efficient, improves the working efficiency of water pump, reduces operating cost.
Optionally, sealing ring 102, water cooled housing 108 and lower rear end are equipped between upper rear end cap 101 and lower rear end cap 103
Gasket 104, the setting of sealing ring 102 and gasket 104 are equipped between lid 103, drive end bearing bracket 109, it is therefore prevented that water is from each company
The place of connecing penetrates into inside motor 1, and then corrodes motor 1, extends the service life of motor 1.
In some embodiments of the invention, water outlet 12, the lower end connection of outlet pipe 2 are connected at the lower end of water inlet pipe 11
The inside of water pump outer cylinder 7, in water pump pressurized water most from water outlet 12 flow to user's pipe network, wherein sub-fraction is logical
The lower end for crossing water inlet pipe 11 on bracket 4 enters, and successively passes through cavity, single cycle runner, cavity, outlet pipe 2, finally by outlet pipe
2 lower end outflow, the private water supply pump for returning to water pump outer cylinder 7 reuse, and form a recyclable process；The present embodiment
The design that is recycled of the cooling water, energy conservation and environmental protection greatly reduces the operating cost of water pump.
Preferably, water inlet 6, water outlet 12 are formed into upper structure out in one, and water outlet 12 can be with respect to water inlet 6
Circumferential 360 ° any rotations；Due to water inlet 6 be set to water pump outer cylinder 7 middle and upper part, high water outlet pump bottom surface certain distance so that
Water pump can retain a certain amount of water under shutdown status, which is enough to flood at least one impeller 15；After water pump is again started up,
The impeller 15 being submerged drives water rotation to move from bottom to top, while generating negative pressure in suction side, so that water pump has self-priming function
Can, the intake performance of water pump is improved, the risk of cavitation erosion is reduced；On the other hand, the water stored in water pump is in impeller 15 and leads
It is constantly moved upwards under the action of fluid, while the water outside water inlet 6 is sucked water pump under the action of negative pressure successively, by its chamber
Gas extrusion discharge inside body, makes in water pump full of water, it is therefore prevented that mechanical seal 3 works in anhydrous situation and done
Phenomenon is ground, the service life of water pump is extended.In addition, water outlet 12 can arbitrarily be rotated relative to circumferential 360 ° of water inlet 6, can meet
The plumbing requirement of different designs angle, it is easy for installation.
Optionally, baffle includes chopped-off head baffle 8, submerged bearing baffle 17, multiple second level baffles 16, chopped-off head water conservancy diversion
Body 8, submerged bearing baffle 17, multiple second level baffles 16 together form the multilevel structure of centrifugal pump, are reached for water pressurization
Purpose meets high-level user water；And support frame 18, chopped-off head baffle 8, submerged bearing baffle 17, second level baffle 16 are under
Up set gradually.
The junction of submerged bearing baffle 17 and pump shaft 14 is additionally provided with guide bearing 9, is made, avoids of wear-resistant material
Direct friction between submerged bearing baffle 17 and pump shaft 14 reduces damage.
In other embodiments of the invention, O-ring 19 is provided between water pump outer cylinder 7 and bracket 4, pedestal 10,
The setting of multi-sealing structure ensure that the good leakproofness of water pump；It is provided with pull rod 5 between bracket 4 and pedestal 10, increases
The stability of water pump.
The operation principle of the present invention is that: torque is passed to pump shaft 14 by shaft coupling 13 by motor 1 from the axis of motor 1,
The impeller 15 of the rotation of 14 impeller 15 of pump shaft, rotation kinetic energy and then transmits water supply.Water passes through the water inlet 6 of water pump outer cylinder 7
It after first order impeller 13 obtains kinetic energy, is spread in chopped-off head baffle 8, part kinetic energy is become potential energy, the potential energy of water increases
Add.Water after potential energy increase, which enters in submerged bearing baffle 17, to spread, and is continued to transfer kinetic energy to water, water by second level impeller 13
Potential energy further increase, pressure rise.Water successively passes through multiple second level baffles 16 with identical supercharging mode later, finally
By the second level baffle 16 of the top through the water outlet 12 on bracket 4, most enters user's pipe network, in addition sub-fraction
It is then flowed by the lower end of the water inlet pipe 11 on bracket 4, after flowing through motor body, is flowed out by the lower end of outlet pipe 2, into water pump
The inside of outer cylinder 7, pressurization uses again together with the water inside water pump outer cylinder 7.
A kind of mute energy-saving water pump of the invention just has the mode of water cooling to replace traditional air cooling way, while using efficient
Magneto greatly reduces noise when motor operation, improves work efficiency.In addition, the present invention also use in into it is upper go out
Inlet and outlet water mode, it is therefore prevented that the generation of cavitation erosion and mechanical seal dry grinding phenomenon, and structure is simple, and extend equipment uses the longevity
Life, reduces costs.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (10)
1. a kind of mute energy-saving water pump characterized by comprising motor, bracket, water pump outer cylinder；
The motor includes rear end cap, water cooled housing, drive end bearing bracket, and three collectively constitutes the shell of the motor；The rear end cap
Comprising upper rear end cap, lower rear end cap, and it is equipped with single cycle runner therebetween；The internal vertical of the water cooled housing is symmetrically arranged with
Cavity, the cavity and the single cycle runner have been connected to form the cooling water pipeline of the motor；
The drive end bearing bracket connects the upper end of the bracket, connects shaft coupling at the center of the drive end bearing bracket, the shaft coupling is set to
The inside of the bracket；
The bracket is the attachment device with water outlet, and lower end connects the upper end of the water pump outer cylinder；
The internal stent is symmetrically arranged with water inlet pipe, outlet pipe, and the upper end of the water inlet pipe connects the lower end of the cavity, described
The upper end of outlet pipe connects the lower end of another cavity；
The water pump outer cylinder be hollow cylindrical structure, middle and upper part be equipped with water inlet, inside be equipped with support frame, baffle,
Pump shaft, lower end connect pedestal；
The upper end of the pump shaft connects the shaft coupling, and lower end connects support frame as described above；
Mechanical seal is equipped between the pump shaft and the bracket；
The baffle is set on the pump shaft, and the inside of the baffle is equipped with impeller.
2. a kind of mute energy-saving water pump according to claim 1, it is characterised in that: the motor is efficient permanent magnet motor,
It also include rotor, bearing, stator winding；The stator winding runs through set on the inside of the water cooled housing, and the rotor is set to
The both ends of the inside of the stator winding, the rotor are equipped with bearing.
3. a kind of mute energy-saving water pump according to claim 1, it is characterised in that: the upper rear end cap and the lower rear end
It is equipped with sealing ring between lid, is equipped with gasket between the water cooled housing and the lower rear end cap, the drive end bearing bracket.
4. a kind of mute energy-saving water pump according to claim 1, it is characterised in that: connect institute at the lower end of the water inlet pipe
Water outlet is stated, the lower end of the outlet pipe connects the inside of the water pump outer cylinder.
5. a kind of mute energy-saving water pump according to claim 1, it is characterised in that: the water inlet, water outlet composition one
Into upper structure out in a, and the water outlet can be relative to circumferential 360 ° any rotations of the water inlet.
6. a kind of mute energy-saving water pump according to claim 1, it is characterised in that: the baffle includes chopped-off head water conservancy diversion
Body, submerged bearing baffle, multiple second level baffles.
7. a kind of mute energy-saving water pump according to claim 6, it is characterised in that: support frame as described above, chopped-off head baffle, water
Bearing baffle, second level baffle are set gradually from the bottom up.
8. a kind of mute energy-saving water pump according to claim 6, it is characterised in that: the submerged bearing baffle and the pump
It is connected between axis with guide bearing.
9. a kind of mute energy-saving water pump according to claim 1, it is characterised in that: the water pump outer cylinder and the bracket,
O-ring is provided between the pedestal.
10. a kind of mute energy-saving water pump according to claim 1, it is characterised in that: between the bracket and the pedestal
It is provided with pull rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811054540.2A CN109026750A (en) | 2018-09-11 | 2018-09-11 | A kind of mute energy-saving water pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811054540.2A CN109026750A (en) | 2018-09-11 | 2018-09-11 | A kind of mute energy-saving water pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109026750A true CN109026750A (en) | 2018-12-18 |
Family
ID=64621326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811054540.2A Pending CN109026750A (en) | 2018-09-11 | 2018-09-11 | A kind of mute energy-saving water pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109026750A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2541645Y (en) * | 2002-04-24 | 2003-03-26 | 北京欧胜龙水泵有限公司 | Low noise high efficiency multi-stage pump |
| CN200943604Y (en) * | 2006-08-31 | 2007-09-05 | 上海连成（集团）有限公司 | Vertical multiple-stage conduit centrifugal pump of novel structure |
| EP2916008A1 (en) * | 2014-03-07 | 2015-09-09 | CALPEDA S.p.A. | Improved electric pump particularly suitable for pumping liquids containing solid impurities |
| CN106194769A (en) * | 2016-08-31 | 2016-12-07 | 池泉 | A kind of quiet centrifugal pump |
| CN106321448A (en) * | 2016-09-29 | 2017-01-11 | 周宁县善长祥农业机械研发有限公司 | Multi-stage water pump and using method thereof |
-
2018
- 2018-09-11 CN CN201811054540.2A patent/CN109026750A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2541645Y (en) * | 2002-04-24 | 2003-03-26 | 北京欧胜龙水泵有限公司 | Low noise high efficiency multi-stage pump |
| CN200943604Y (en) * | 2006-08-31 | 2007-09-05 | 上海连成（集团）有限公司 | Vertical multiple-stage conduit centrifugal pump of novel structure |
| EP2916008A1 (en) * | 2014-03-07 | 2015-09-09 | CALPEDA S.p.A. | Improved electric pump particularly suitable for pumping liquids containing solid impurities |
| CN106194769A (en) * | 2016-08-31 | 2016-12-07 | 池泉 | A kind of quiet centrifugal pump |
| CN106321448A (en) * | 2016-09-29 | 2017-01-11 | 周宁县善长祥农业机械研发有限公司 | Multi-stage water pump and using method thereof |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20181218 |
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| WD01 | Invention patent application deemed withdrawn after publication |