CN108894993A - A kind of sewage pump using water-cooled - Google Patents
A kind of sewage pump using water-cooled Download PDFInfo
- Publication number
- CN108894993A CN108894993A CN201810549112.0A CN201810549112A CN108894993A CN 108894993 A CN108894993 A CN 108894993A CN 201810549112 A CN201810549112 A CN 201810549112A CN 108894993 A CN108894993 A CN 108894993A
- Authority
- CN
- China
- Prior art keywords
- water
- end cap
- water filling
- motor
- housing
- 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.)
- Granted
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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
- F04D13/0606—Canned motor pumps
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- 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
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- 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
- F04D29/5806—Cooling the drive system
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- 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
- F04D29/5886—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling by injection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a kind of sewage pumps using water-cooled, including electric machine casing, junction box body, fill the water room housing, infuse Water chamber end cap, the pump housing, impeller, lower cover and pedestal, junction box body is mounted on the tail end of electric machine casing, the motor internal of electric machine casing uses waterproof electromagnetic wire, note Water chamber end cap is mounted in water filling room housing, water filling room housing and note Water chamber end cap are mounted on the head end of electric machine casing, it fills the water setting water filling screw hole in room housing and is blocked by water filling bolt, water filling room is connected to the inside of electric machine casing by being arranged in water filling room housing communicating pipe, note Water chamber end cap on setting discharge water screw hole and by discharge water bolt block, the pump housing is mounted on note Water chamber end cap, the impeller of pump body drives rotation by the output shaft of motor；The present invention cools down motor using filling the water in water filling room, and good heat dissipation effect meets motor required amount of cooling water when running at high speed, and ensure that motor runs well under the higher state of long-term temperature.
Description
Technical field
The present invention relates to a kind of sewage pump more particularly to a kind of sewage pumps using water-cooled, belong to water pump technology.
Background technique
For sewage pump currently on the market mainly based on dry type motor, the coiling of motor uses enameled wire, and sealing uses machine
Tool sealing structure, wherein sealing is isolated for the pump housing and grease chamber together, another road sealing is isolated for grease chamber and motor room, cooling
Municipal wastewater pipeline, sewage plant area and ground are especially used in since the use environment of sewage pump is poor with the oily type of cooling
In the environment of lower cesspit, the motor operating of sewage pump can generate high temperature, the high temperature master that the motor operating of sewage pump generates at present
It to be cooled down with the lubricating oil of grease chamber, but the space of grease chamber is limited, the oil contained is less, is unable to satisfy motor and transports in high speed
Required amount of cooling water when turning, motor operates under the higher state of long-term temperature will lead to mechanical seal damage, cause oil
Room and motor room's water inlet, eventually lead to motor and burn out.
Summary of the invention
To solve the deficiencies in the prior art, the present invention provides a kind of sewage pump using water-cooled, and sewage pump motor uses
The grease chamber of existing sewage pump is changed to water filling room, allows water filling room to be connected to motor room, increase moisture storage capacity, increase by waterproof electromagnetic wire
Cooling effect, mechanical seal are changed to one, the i.e. isolation of pump housing impeller and water filling room, cut the grease chamber and motor of existing sewage pump
The mechanical seal of room, and it is connected to water filling room with the inside of electric machine casing, the side wall in water filling room opens two bolts hole as note
Water hole, opens a bolt hole as dewatering orifice in the bottom head covers of water filling room, using filled the water in water filling room come to motor into
Row cooling, water injection rate is big, the good heat dissipation effect of water, meets motor required amount of cooling water when running at high speed, ensure that motor
It runs well under the higher state of long-term temperature.
The technical scheme adopted by the invention is as follows：
A kind of sewage pump using water-cooled, including electric machine casing, junction box body, water filling room housing, note Water chamber end cap, the pump housing,
Impeller, lower cover and pedestal, the junction box body are sealingly mounted at the tail end of electric machine casing, and the motor internal of electric machine casing is adopted
With waterproof electromagnetic wire, the note Water chamber end cap is mounted in water filling room housing, makes to fill the water formation water filling room inside room housing, described
Water filling room housing and note Water chamber end cap are mounted on the head end of electric machine casing, and fill the water room housing and note Water chamber end cap and cover in motor
On output shaft, the output shaft of motor and water filling room housing are rotatablely connected by bearing, the output shaft of motor with infuse Water chamber end cap it
Between be provided with outside framework oil seal, be provided with water filling screw hole in the water filling room housing, and fill the water screw hole and block by water filling bolt, institute
It states water filling room and is connected to communicating pipe with the inside of electric machine casing by being arranged in water filling room housing, is provided on note Water chamber end cap
Discharge water screw hole, and the screw hole that discharges water is blocked by the bolt that discharges water, and the pump housing is mounted on note Water chamber end cap, and the impeller setting exists
Pump body, and the output shaft of the impeller and motor is keyed, and drives impeller rotation, the lower end by the output shaft of motor
Lid is mounted on the water inlet position of the pump housing, and the pedestal is mounted on lower cover.
As present invention further optimization, for the waterproof electromagnetic wire using three-layer insulated, internal layer core is oxygen-free copper
130 grades of polyester enamelled wires, middle layer are high pressure polyethylene insulated layers, and outer layer is polyamide 1010 restrictive coating；Effectively improve motor
Waterproof performance allows motor to work long hours in water, and is radiated by water；130 grades of polyester enamelled wire tools of oxygen-free copper
There is extraordinary insulation performance, electrical property and heat resistance are good, resistance to scraped finish, resistance to mechanical intensity；High pressure polyethylene insulated layer
Toughness is high, acidproof alkali salt, and insulating properties is splendid；Polyamide 1010 restrictive coating can be subjected to impregnating for a long time, to high pressure polyethylene
Insulating layer plays extraordinary protective effect.
As present invention further optimization, RUBBER O is provided on note Water chamber end cap and the joint face of water filling room housing
Type circle effectively improves note Water chamber end cap and fills the water the connection sealing of room housing, prevents from filling the water indoor water leakage.
As present invention further optimization, covered on the output shaft of the motor between note Water chamber end cap and water filling room housing
It is connected to retaining ring, prevent note Water chamber end cap and fills the water room housing axial float.
As present invention further optimization, gasket is accompanied in the junction of the pump housing and note Water chamber end cap, described is close
Packing is fish paper, improves the pump housing and infuses the connection sealing of Water chamber end cap.
As present invention further optimization, gasket, the gasket are accompanied in the junction of lower cover and the pump housing
It is fish paper, improves the connection sealing of lower cover and the pump housing.
As present invention further optimization, it is provided with hanging ring on the junction box body, lifts movement convenient for user
Sewage pump.
As present invention further optimization, label is provided on the lateral wall of the electric machine casing, label is to sewage
Technical parameter, working principle and the mounting means of pump are identified, and are installed and used convenient for user.
As present invention further optimization, the diameter of the water filling screw hole is 12mm, and the water filling screw hole is set
There are two setting, water filling screw hole is blocked after water filling bolt socket gasket, water filling work when being easily installed is infused meeting
The structural behaviour of water filling room housing is improved under the action of water.
As present invention further optimization, the diameter of the screw hole that discharges water is 12mm, and the bolt that discharges water is socketed gasket
The screw hole that discharges water is blocked afterwards, makes it under the action of meeting draining, improves the structural behaviour of note Water chamber end cap.
The beneficial effects of the present invention are：Sewage pump motor uses waterproof electromagnetic wire, and the grease chamber of existing sewage pump is changed to
Room is filled the water, allows water filling room to be connected to motor room, increases moisture storage capacity, increase cooling effect, mechanical seal is changed to one, i.e. pump housing leaf
The isolation of wheel and water filling room, cuts the grease chamber of existing sewage pump and the mechanical seal of motor room, and makes to fill the water room and electric machine casing
Inside connection, the side wall in water filling room opens two bolts hole as water injection hole, opens a spiral shell in the bottom head covers for filling the water room
Keyhole cools down motor using filling the water in water filling room, water injection rate is big, the good heat dissipation effect of water, full as dewatering orifice
Sufficient motor required amount of cooling water when running at high speed ensure that motor runs well under the higher state of long-term temperature.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention；
Main appended drawing reference meaning is as follows in figure：
The 1- pump housing, 2- impeller, 3- note Water chamber end cap, 4- water filling room, the output shaft of 5- motor, 6- lower cover, 7- pedestal, 8- are hung
Ring, 9- fill the water bolt, 10- junction box body, 11- label, 12- electric machine casing, and 13- discharges water bolt, 14- retaining ring, 15- skeleton oil
Envelope, 16- fill the water room housing, 17- communicating pipe, 18- rubber o-ring.
Specific embodiment
Specific introduction is done to the present invention with reference to the accompanying drawings and examples.
As shown in Figure 1：The present embodiment is a kind of sewage pump using water-cooled, including electric machine casing 12, junction box body 10,
Fill the water room housing 16, note Water chamber end cap 3, the pump housing 1, impeller 2, lower cover 6 and pedestal 7, wherein the sealing installation of junction box body 10
In the tail end of electric machine casing 12, the motor internal of electric machine casing 12 uses waterproof electromagnetic wire, and note Water chamber end cap 3 is mounted on water filling room
On shell 16, make to fill the water formation water filling room 4 inside room housing 16, water filling room housing 16 and note Water chamber end cap 3 are mounted on motor casing
The head end of body 12, and 3 sets of Water chamber end cap of room housing 16 and note are filled the water on the output shaft 5 of motor, the output shaft 5 of motor and water filling
Room housing 16 is rotatablely connected by bearing, is provided with outside framework oil seal 15, skeleton between the output shaft 5 and note Water chamber end cap 3 of motor
Oil sealing 15 is socketed on the output shaft 5 of motor, is filled the water and is provided with water filling screw hole in room housing 16, and is filled the water screw hole and passed through water filling spiral shell
Bolt 9 blocks, and water filling room 4 is connected to the inside of electric machine casing 12 by being arranged in water filling room housing 16 communicating pipe 17, is filling the water
The screw hole that discharges water is provided on room end cap 3, and the screw hole that discharges water is blocked by the bolt 13 that discharges water, the pump housing 1 is mounted on note Water chamber end cap 3
On, impeller 2 is arranged inside the pump housing 1, and the output shaft 5 of impeller 2 and motor is keyed, and drives leaf by the output shaft 5 of motor
2 rotation of wheel, lower cover 6 are mounted on the water inlet position of the pump housing 1, and pedestal 7 is mounted on lower cover 6.
Using three-layer insulated, internal layer core is 130 grades of polyester enamelled wires of oxygen-free copper for waterproof electromagnetic wire in the present embodiment, in
Layer is high pressure polyethylene insulated layer, and outer layer is polyamide 1010 restrictive coating；The waterproof performance for effectively improving motor makes motor can be with
It works long hours, and is radiated by water in water；130 grades of polyester enamelled wires of oxygen-free copper have extraordinary insulation performance,
Electrical property and heat resistance are good, resistance to scraped finish, resistance to mechanical intensity；The toughness of high pressure polyethylene insulated layer is high, acidproof alkali salt, insulation
Property is splendid；Polyamide 1010 restrictive coating can be subjected to impregnating for a long time, play extraordinary guarantor to high pressure polyethylene insulated layer
Shield effect.
In the present embodiment, it is provided with rubber o-ring 18 on note Water chamber end cap 3 and the joint face of water filling room housing 16, is had
Effect improves note Water chamber end cap 3 and fills the water the connection sealing of room housing 16, prevents the water in water filling room 4 from leaking out.
In the present embodiment, retaining ring is socketed on the output shaft 5 of the motor between note Water chamber end cap 3 and water filling room housing 16
14, it prevents note Water chamber end cap 3 and fills the water 16 axial float of room housing.
In the present embodiment, gasket is accompanied in the junction of the pump housing 1 and note Water chamber end cap 3, gasket is fish paper, is improved
The connection sealing of the pump housing 1 and note Water chamber end cap 3.
In the present embodiment, gasket is accompanied in the junction of lower cover 6 and the pump housing 1, gasket is fish paper, improves lower end
The connection sealing of lid 6 and the pump housing 1.
In the present embodiment, it is provided with hanging ring 8 on junction box body 10, lifts mobile sewage pump convenient for user.
In the present embodiment, be provided with label 11 on the lateral wall of electric machine casing 12, label 11 to the technical parameter of sewage pump,
Working principle and mounting means are identified, and are installed and used convenient for user.
In the present embodiment, the diameter for filling the water screw hole is 12mm, and is filled the water there are two screw hole settings, and water filling bolt 9 is socketed close
Water filling screw hole is blocked after packing, water filling work when being easily installed, water filling room shell is improved under the action of meeting water filling
The structural behaviour of body 16.
In the present embodiment, the diameter for the screw hole that discharges water is 12mm, is carried out after the bolt 13 that discharges water socket gasket to the screw hole that discharges water
It blocks, makes it under the action of meeting draining, improve the structural behaviour of note Water chamber end cap 3.
Sewage pump motor of the present invention uses waterproof electromagnetic wire, and the grease chamber of existing sewage pump is changed to water filling room, allows and fills the water room
Be connected to motor room, increase moisture storage capacity, increase cooling effect, mechanical seal is changed to one, i.e., pump housing impeller and water filling room every
From, cut the grease chamber of existing sewage pump and the mechanical seal of motor room, and make fill the water room be connected to the inside of electric machine casing, infusing
The side wall of water chamber opens two bolts hole as water injection hole, a bolt hole is opened in the bottom head covers of water filling room as dewatering orifice,
Motor is cooled down using being filled the water in water filling room, water injection rate is big, the good heat dissipation effect of water, meets motor and is running at high speed
When required amount of cooling water, ensure that motor runs well under the higher state of long-term temperature.
The above is only the preferred embodiment of the invention patent, it is noted that for the common skill of the art
For art personnel, under the premise of not departing from the invention patent principle, several improvements and modifications can also be made, these improve and
Retouching also should be regarded as the scope of protection of the patent of the present invention.
Claims (10)
1. a kind of sewage pump using water-cooled, it is characterised in that：Including electric machine casing, junction box body, water filling room housing, water filling
Room end cap, the pump housing, impeller, lower cover and pedestal, the junction box body are sealingly mounted at the tail end of electric machine casing, electric machine casing
Motor internal use waterproof electromagnetic wire, the note Water chamber end cap be mounted on water filling room housing on, make fill the water room housing inside shape
At water filling room, the water filling room housing and note Water chamber end cap are mounted on the head end of electric machine casing, and fill the water room housing and water filling room
End cap covers on the output shaft of motor, and the output shaft and water filling room housing of motor are rotatablely connected by bearing, the output shaft of motor
It is provided with outside framework oil seal between note Water chamber end cap, water filling screw hole is provided in the water filling room housing, and fills the water screw hole and passes through
It fills the water bolt to block, the water filling room is connected to the inside of electric machine casing by being arranged in water filling room housing communicating pipe, is being infused
The screw hole that discharges water is provided on Water chamber end cap, and the screw hole that discharges water is blocked by the bolt that discharges water, the pump housing is mounted on note Water chamber end cap
On, the impeller setting is in pump body, and the output shaft of the impeller and motor is keyed, and is driven by the output shaft of motor
Impeller rotation, the lower cover are mounted on the water inlet position of the pump housing, and the pedestal is mounted on lower cover.
2. a kind of sewage pump using water-cooled according to claim 1, which is characterized in that the waterproof electromagnetic wire is adopted
With three-layer insulated, internal layer core is 130 grades of polyester enamelled wires of oxygen-free copper, and middle layer is high pressure polyethylene insulated layer, and outer layer is polyamides
1010 restrictive coating of amine.
3. a kind of sewage pump using water-cooled according to claim 1, which is characterized in that in note Water chamber end cap and water filling
Rubber o-ring is provided on the joint face of room housing.
4. a kind of sewage pump using water-cooled according to claim 1, which is characterized in that in note Water chamber end cap and water filling
Retaining ring is socketed on the output shaft of motor between room housing.
5. a kind of sewage pump using water-cooled according to claim 1, which is characterized in that in the pump housing and note Water chamber end cap
Junction accompany gasket, the gasket is fish paper.
6. a kind of sewage pump using water-cooled according to claim 1, which is characterized in that in the company of lower cover and the pump housing
The place of connecing accompanies gasket, and the gasket is fish paper.
7. a kind of sewage pump using water-cooled according to claim 1, which is characterized in that set on the junction box body
It is equipped with hanging ring.
8. a kind of sewage pump using water-cooled according to claim 1, which is characterized in that outside the electric machine casing
Label is provided on side wall.
9. a kind of sewage pump using water-cooled according to claim 1, which is characterized in that described fills the water the straight of screw hole
Diameter is 12mm, and there are two the water filling screw hole settings, is blocked after water filling bolt socket gasket to water filling screw hole.
10. a kind of sewage pump using water-cooled according to claim 1, which is characterized in that the screw hole that discharges water
Diameter is 12mm, is blocked after the bolt that discharges water socket gasket to the screw hole that discharges water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810549112.0A CN108894993B (en) | 2018-05-31 | 2018-05-31 | Utilize radiating sewage pump of water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810549112.0A CN108894993B (en) | 2018-05-31 | 2018-05-31 | Utilize radiating sewage pump of water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108894993A true CN108894993A (en) | 2018-11-27 |
| CN108894993B CN108894993B (en) | 2019-12-20 |
Family
ID=64343698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810549112.0A Active CN108894993B (en) | 2018-05-31 | 2018-05-31 | Utilize radiating sewage pump of water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108894993B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228353A (en) * | 2020-09-16 | 2021-01-15 | 山东泉盈泵业有限公司 | Sewage pump seal assembly and sewage pump |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0990800A1 (en) * | 1998-10-01 | 2000-04-05 | Ingersoll-Dresser Pump Company | Forced closed-loop cooling for a submersible pump motor |
| CN2916210Y (en) * | 2006-04-21 | 2007-06-27 | 淮南市华源矿用机电设备厂 | Explosion-suppression water-cooled type submersible electric sewage pump for mining |
| CN200996394Y (en) * | 2007-01-16 | 2007-12-26 | 上海熊猫机械(集团)有限公司 | Water-cooling pump |
| CN103062135A (en) * | 2013-01-08 | 2013-04-24 | 安徽三联泵业股份有限公司 | Internal circulating cooling system and internal circulating cooling method of submersible electric pump motor |
| CN203394781U (en) * | 2013-06-17 | 2014-01-15 | 上海东方泵业(集团)有限公司 | Novel high-temperature water heating low-noise pipeline pump |
| CN103644125A (en) * | 2012-04-20 | 2014-03-19 | 颠峰Esp有限责任公司 | System and method for enhanced magnet wire insulation |
-
2018
- 2018-05-31 CN CN201810549112.0A patent/CN108894993B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0990800A1 (en) * | 1998-10-01 | 2000-04-05 | Ingersoll-Dresser Pump Company | Forced closed-loop cooling for a submersible pump motor |
| CN2916210Y (en) * | 2006-04-21 | 2007-06-27 | 淮南市华源矿用机电设备厂 | Explosion-suppression water-cooled type submersible electric sewage pump for mining |
| CN200996394Y (en) * | 2007-01-16 | 2007-12-26 | 上海熊猫机械(集团)有限公司 | Water-cooling pump |
| CN103644125A (en) * | 2012-04-20 | 2014-03-19 | 颠峰Esp有限责任公司 | System and method for enhanced magnet wire insulation |
| CN103062135A (en) * | 2013-01-08 | 2013-04-24 | 安徽三联泵业股份有限公司 | Internal circulating cooling system and internal circulating cooling method of submersible electric pump motor |
| CN203394781U (en) * | 2013-06-17 | 2014-01-15 | 上海东方泵业(集团)有限公司 | Novel high-temperature water heating low-noise pipeline pump |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228353A (en) * | 2020-09-16 | 2021-01-15 | 山东泉盈泵业有限公司 | Sewage pump seal assembly and sewage pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108894993B (en) | 2019-12-20 |
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