CN108443178B - Fan - Google Patents
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- Publication number
- CN108443178B CN108443178B CN201810203795.4A CN201810203795A CN108443178B CN 108443178 B CN108443178 B CN 108443178B CN 201810203795 A CN201810203795 A CN 201810203795A CN 108443178 B CN108443178 B CN 108443178B
- Authority
- CN
- China
- Prior art keywords
- hole
- fan
- fan blade
- blade body
- rubber block
- 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
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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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
- F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
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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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/263—Rotors specially for elastic fluids mounting fan or blower rotors on shafts
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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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
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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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/668—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a fan, which comprises a motor and a rotating shaft connected with the motor, wherein a fan blade body is connected to the rotating shaft, a first through hole is formed in the fan blade body along the length direction of the fan blade body, and one end, close to the rotating shaft, of the first through hole is connected with an air pipe for air inlet. Through set up first through-hole on the flabellum body along its length direction, can be connected to motor inner space with the one end that ventilates, at flabellum pivoted in-process, can utilize centrifugal force effect, make the continuous follow first through-hole of air outflow in the follow motor, play to fan motor last radiating effect.
Description
Technical Field
The invention relates to a fan, and belongs to the technical field of industrial fans.
Background
The industrial fan can most effectively push a large amount of air to move, generate super-large air quantity, enable a space to form a moving and circulating air flow field, and can effectively regulate and control the air circulation problem of an industrial production workshop. The area of blowing by an industrial fan has a direct relationship with the diameter of the fan. In order to obtain a larger blowing area, a large-diameter fan blade is generally adopted, but the existing fan blade generally adopts a structure of connecting iron sheets, one of the iron sheets is inserted into the fan blade for locking, and the other is clamped by an upper layer of iron sheet and a lower layer of iron sheet. However, both fixing modes are to directly contact the fan blades made of hard materials and metal materials, and the joints are not buffered, so that the fan blades at the joints are broken due to gravity of the fan blades and vibration in the rotating process in the using process of the fan. In addition, the blowing area of the industrial fan and the diameter of the fan have direct relation, in order to obtain a larger blowing area, large-diameter fan blades are usually adopted, but in order to drive the large-diameter fan blades, a high-power motor is required, and after the high-power motor is adopted, heat dissipation becomes a new problem.
Disclosure of Invention
The invention aims to solve the technical problem of providing a fan, which is characterized in that a through hole is formed in a fan blade body along the length direction of the fan blade body, one end of ventilation is connected to the inner space of a motor, and in the rotating process of the fan blade, air continuously flows out from the inner side of the motor along the through hole by utilizing the centrifugal force effect, so that the effect of heating the fan motor is achieved.
In order to solve the technical problems, the invention adopts the following technical scheme:
The utility model provides a fan, includes the motor and with the pivot that the motor is connected, be connected with the flabellum body in the pivot, the flabellum body is provided with first through-hole along its length direction, first through-hole is close to the one end of pivot is connected with the tuber pipe that is used for the air inlet.
The foregoing fan, characterized in that: the motor is fixedly provided with a shell, the lower surface and/or the side surface of the shell are/is provided with air inlets, the air pipe is of a bent shape, one end of the air pipe is communicated with the first through hole, and the other end of the air pipe extends into a gap between the motor and the shell.
The foregoing fan, characterized in that: the motor is characterized in that a shell is fixedly arranged outside the motor, a heat dissipation cover is further arranged outside the shell, an air inlet is formed in the lower surface and/or the side face of the heat dissipation cover, the air pipe is bent, one end of the air pipe is communicated with the first through hole, and the other end of the air pipe stretches into a gap between the shell and the heat dissipation cover.
The foregoing fan, characterized in that: the fan blade body is close to the upper surface and the lower surface of one end of the rotating shaft are respectively fixed with an upper rubber block and a lower rubber block, the upper rubber block and the lower rubber block are completely attached to the contact surface of the fan blade body and the corresponding surface of the fan blade body, an upper metal sheet and a lower metal sheet are respectively fixedly connected with the upper rubber block and the lower rubber block, the lower metal sheet is fixedly connected with the rotating shaft, and an opening for the air pipe to pass through is formed in the lower metal sheet.
The foregoing fan, characterized in that: the upper rubber block and the lower rubber block are provided with at least two groups of bolt holes with corresponding positions, and the upper rubber block and the lower rubber block are fixed on the upper surface and the lower surface of the fan blade body through bolt assemblies penetrating through the bolt holes and the fan blade body.
The foregoing fan, characterized in that: the upper surface of last rubber piece and the lower surface of lower rubber piece all are provided with a plurality of sheetmetal fixed orifices, go up between rubber piece and the lower rubber piece and the sheetmetal and realize fixed connection through fixing the connecting piece in the fixed orifices, just go up the upper surface of rubber piece and the lower surface of lower rubber piece all be provided with the slot that the sheetmetal shape is unanimous, the sheetmetal is fixed in the slot.
The foregoing fan, characterized in that: the fan blade body is provided with a second through hole and a third through hole along the length direction of the fan blade body.
The foregoing fan, characterized in that: the second through hole and the third through hole are positioned at two sides of the first through hole.
The foregoing fan, characterized in that: the fan blade body is provided with at least one steel wire rope mounting hole along the length direction of the fan blade body.
The foregoing fan, characterized in that: the number of the steel wire rope mounting holes is two, and the two steel wire rope mounting holes are respectively arranged on two sides of the first through hole.
The beneficial effects of the invention are as follows:
1. Through the first through hole arranged on the fan blade body along the length direction, one ventilated end can be connected to the internal space of the motor, and in the rotating process of the fan blade, air can continuously flow out from the motor along the first through hole under the action of centrifugal force, so that the effect of continuously radiating the fan motor is achieved;
2. Through adopting the rubber piece of large tracts of land to carry out the centre gripping to the flabellum body, when increasing the contact surface, utilize the pliability buffering flabellum of rubber piece to rotate the vibration in-process, the upper and lower two-layer sheetmetal of recycle is fixed, has strengthened the fixed intensity of whole flabellum higher, and the steadiness is better.
Drawings
FIG. 1 is a schematic view of a fan according to the present invention;
FIG. 2 is a schematic view illustrating a fixing structure of a blade body of a fan according to the present invention;
FIG. 3 is a side view of the upper rubber block of a fan of the present invention;
FIG. 4 is a top view of the upper rubber block of a fan of the present invention;
FIG. 5 is a side view of a lower rubber block of a fan according to the present invention;
fig. 6 is a schematic structural view of a blade body of a fan according to the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1-4, a fan comprises a motor 100 and a rotating shaft 200 connected with the motor 100, wherein a fan blade body 10 is connected to the rotating shaft 200, a first through hole 1 is arranged on the fan blade body along the length direction of the fan blade body, and an air pipe 600 for air intake is connected to one end of the first through hole 1, which is close to the rotating shaft 200.
Through set up first through-hole on the flabellum body along its length direction to be close to at first through-hole 1 the one end of pivot 200 is connected with the tuber pipe 600 that is used for the air inlet, at the in-process of flabellum body 10 pivoted, can utilize centrifugal force effect, makes the air constantly follow the tuber pipe 600 internal air inlet that is close to the motor out, flows along first through-hole, plays the effect to fan motor continuously dispels the heat.
In this embodiment, the outer casing 500 is fixedly disposed on the outer side of the motor 100, an air inlet is disposed on the lower surface and/or the side surface of the outer casing 500, the air duct 600 is bent, one end of the air duct is communicated with the first through hole 1, and the other end of the air duct extends into the gap between the motor 100 and the outer casing 500. By extending one end of the air duct 600 into the gap between the motor 100 and the housing 500, the air around the motor continuously flows during the rotation of the fan, and the cooling is achieved.
Meanwhile, a casing 500 may be fixedly disposed on the outer surface of the motor 100, a heat dissipation cover is further disposed on the outer surface of the casing 500, an air inlet is disposed on the lower surface and/or the side surface of the heat dissipation cover, the air duct 600 is bent, one end of the air duct is communicated with the first through hole 1, and the other end of the air duct extends into a gap between the casing 500 and the heat dissipation cover (not shown in the figure). Through stretch into tuber pipe 600 one end to in the clearance between shell 500 and the heat dissipation cover to realize at fan pivoted in-process, the continuous flow of shell 500 and the air of heat dissipation cover realizes the cooling to shell 500, and then realizes the cooling to the motor.
The fan blade body 10 is close to the upper and lower surfaces of one end of the rotating shaft 200 and is respectively fixed with an upper rubber block 20 and a lower rubber block 30, the contact surfaces of the upper rubber block 20 and the lower rubber block 30 with the fan blade body 10 are completely attached to the corresponding surfaces of the fan blade body 10, the upper rubber block 20 and the lower rubber block 30 are respectively fixedly connected with an upper metal sheet 400 and a lower metal sheet 300, the lower metal sheet 300 is fixedly connected with the rotating shaft 200, and an opening for the air pipe 600 to pass through is formed in the lower metal sheet 300.
Through adopting the rubber piece of large tracts of land to laminate the centre gripping completely to the upper and lower surface of flabellum body, when increasing the contact surface, in this embodiment, the length of flabellum is 2-8 meters, consequently its gravity and the vibration that probably takes place in the rotation in-process are bigger, utilize the pliability buffering flabellum of rubber piece to rotate the vibration in-process, can prevent effectively that the fan from taking place the cracked condition of flabellum in the rotation in-process, the two-layer sheetmetal is fixed about the reuse, the intensity that has strengthened whole flabellum to fix is higher, the steadiness is better. The rubber blocks in this embodiment may be replaced by other types of soft ductile materials.
The upper rubber block 20 and the lower rubber block 30 are provided with at least two groups of bolt holes 21 corresponding to each other, and the upper rubber block 20 and the lower rubber block 30 are fixed on the upper surface and the lower surface of the fan blade body 10 through bolt assemblies 40 penetrating through the bolt holes 21 and the fan blade body 10. The fan blade is fixedly connected with the upper rubber block and the lower rubber block, and the structure is simple and the connection is convenient.
The upper surface of last rubber piece 20 and the lower surface of lower rubber piece 30 all are provided with a plurality of sheetmetal fixed orifices 22, realize fixed connection through the connecting piece of fixing in the fixed orifices 22 between last rubber piece 20 and lower rubber piece 30 and the sheetmetal, the upper surface of last rubber piece 20 and the lower surface of lower rubber piece 30 all be provided with the slot 23 that the sheetmetal shape is unanimous, the sheetmetal is fixed in slot 23, make things convenient for the connection of rubber piece and sheetmetal.
The fan blade body is provided with a second through hole 2 and a third through hole 3 along the length direction, an energizing lead can be arranged in the second through hole 2, a metal needle (not shown in the figure) or a metal wire (not shown in the figure) arranged at the edge of the side surface of the fan blade is utilized to form a negative ion generator or a plasma generator, the fan can purify air in the rotating process of the fan, the effect of eliminating static electricity can be achieved, in the practical use process, generally, one fan is provided with six fan blades, and the negative ion generator and the plasma generator are arranged in the six fan blades at intervals.
Meanwhile, a water pipe can be arranged in the third through hole, and a water mist nozzle is arranged at the tail end in a matched mode, in the rotating process of the fan, the fan blade diameter of the industrial fan is large, the length of the fan body is usually 2-8 meters, and when water in the third through hole slides to the tail end along with the rotating fan blade, the water in the third through hole can be converted into water mist to be sprayed, so that the humidifying effect is achieved.
The upper surface 5 of leaf fan body is arc structure, makes whole flabellum accord with the aerodynamics more, at flabellum pivoted in-process, reduces the resistance, and is more energy-conserving. The second through holes 2 and the third through holes 3 are positioned on two sides of the first through holes 1, and the upper surfaces of the fan blades are arc-shaped, so that the first through holes for ventilation are arranged in the middle of the fan blades, and the ventilation quantity is increased as much as possible. And the cavity at the third through hole 3 can be used as an anti-collision cavity, so that the whole fan blade can not deform greatly when the side face of the third through hole 3 is impacted.
The fan blade body is provided with at least one steel wire rope mounting hole 4 along the length direction of the fan blade body, steel wires can be inserted into the steel wire rope mounting hole, and when the fan blade is broken by accidental collision, broken parts can not fall off due to the action of the steel wire rope, so that safety accidents are avoided. In this embodiment, the number of the steel wire rope mounting holes 4 is two, and the two steel wire rope mounting holes are respectively disposed at two sides of the first through hole 1.
The upper surface of the fan blade body 10 is of an arc-shaped structure, so that the whole fan blade accords with aerodynamics, and the resistance is reduced and the energy is saved in the rotation process of the fan blade.
In summary, according to the fan provided by the invention, the through hole is formed in the fan blade body along the length direction of the fan blade body, one end of the ventilation is connected to the inner space of the motor, and in the rotating process of the fan blade, air continuously flows out from the inner side of the motor along the through hole under the action of centrifugal force, so that the effect of heating the fan motor is achieved.
The foregoing has outlined and described the basic principles, features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The utility model provides a fan, includes motor (100) and with pivot (200) that motor (100) are connected, be connected with flabellum body (10) on pivot (200), the flabellum body is provided with first through-hole (1) along its length direction, first through-hole (1) are close to one end of pivot (200) is connected with tuber pipe (600) that are used for the air inlet, its characterized in that: the fan blade body (10) is provided with a second through hole (2) and a third through hole (3) along the length direction, an electrified wire is arranged in the second through hole (2), and a metal needle or a metal wire is arranged at the edge of the side surface of the fan blade to form a negative ion generator or a plasma generator; the cavity at the third through hole (3) is used as an anti-collision cavity; an upper rubber block (20) and a lower rubber block (30) are respectively fixed on the upper surface and the lower surface of one end, close to the rotating shaft (200), of the fan blade body (10), the contact surfaces of the upper rubber block (20) and the lower rubber block (30) with the fan blade body (10) are completely attached to the corresponding surfaces of the fan blade body (10), an upper metal sheet (400) and a lower metal sheet (300) are respectively fixedly connected with the upper rubber block (20) and the lower rubber block (30), the lower metal sheet (300) is fixedly connected with the rotating shaft (200), and an opening for the air pipe (600) to pass through is formed in the lower metal sheet (300); at least two groups of bolt holes (21) corresponding to each other are formed in the upper rubber block (20) and the lower rubber block (30), and the upper rubber block (20) and the lower rubber block (30) are fixed on the upper surface and the lower surface of the fan blade body (10) through bolt assemblies (40) penetrating through the bolt holes (21) and the fan blade body (10); the upper surface of last rubber piece (20) and the lower surface of lower rubber piece (30) all are provided with a plurality of sheetmetal fixed orifices (22), go up between rubber piece (20) and lower rubber piece (30) and the sheetmetal and realize fixed connection through the connecting piece of fixing in fixed orifices (22), just the upper surface of last rubber piece (20) and the lower surface of lower rubber piece (30) all be provided with sheetmetal shape unanimous slot (23), the sheetmetal is fixed in slot (23).
2. A fan as claimed in claim 1, wherein: the motor (100) is fixedly provided with a shell (500) outside, an air inlet is formed in the lower surface and/or the side face of the shell (500), the air pipe (600) is bent, one end of the air pipe is communicated with the first through hole (1), and the other end of the air pipe stretches into a gap between the motor (100) and the shell (500).
3. A fan as claimed in claim 1, wherein: the motor (100) is fixedly provided with a shell (500) outside, a heat dissipation cover is arranged outside the shell (500), an air inlet is formed in the lower surface and/or the side face of the heat dissipation cover, the air pipe (600) is bent, one end of the air pipe is communicated with the first through hole (1), and the other end of the air pipe extends into a gap between the shell (500) and the heat dissipation cover.
4. A fan as claimed in claim 1, wherein: the second through hole (2) and the third through hole (3) are positioned on two sides of the first through hole (1).
5. A fan as claimed in claim 1, wherein: the fan blade body is provided with at least one steel wire rope mounting hole (4) along the length direction of the fan blade body.
6. A fan as described in claim 5, wherein: the number of the steel wire rope mounting holes (4) is two, and the two steel wire rope mounting holes are respectively arranged on two sides of the first through hole (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810203795.4A CN108443178B (en) | 2018-03-13 | 2018-03-13 | Fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810203795.4A CN108443178B (en) | 2018-03-13 | 2018-03-13 | Fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108443178A CN108443178A (en) | 2018-08-24 |
| CN108443178B true CN108443178B (en) | 2024-07-26 |
Family
ID=63194934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810203795.4A Active CN108443178B (en) | 2018-03-13 | 2018-03-13 | Fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108443178B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW354620U (en) * | 1997-10-13 | 1999-03-11 | Xiang-Heng Tang | Improvement of casing and blade support for ceiling fan |
| CN104314846A (en) * | 2014-10-15 | 2015-01-28 | 洛阳北玻台信风机技术有限责任公司 | Industrial large fan with fan protection measures |
| TWM530888U (en) * | 2016-06-14 | 2016-10-21 | Jian-Xuan Lin | Blade |
| CN208364426U (en) * | 2018-03-13 | 2019-01-11 | 吴江市大印墨风力发电机制造有限公司 | A kind of fan |
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| FR2491269A1 (en) * | 1980-09-26 | 1982-04-02 | Thomson Brandt | Async. electric motor with ducted ventilation - uses disc formed into duct to carry air radially outwards around stator winding of motor |
| JP3216988B2 (en) * | 1996-04-26 | 2001-10-09 | 株式会社日立製作所 | Vacuum cleaner and electric blower for vacuum cleaner |
| US6382917B1 (en) * | 1999-03-03 | 2002-05-07 | Hunter Fan Company | Ceiling fan having side mounted blade irons |
| JP4126212B2 (en) * | 2001-11-19 | 2008-07-30 | エドワーズ株式会社 | Vacuum pump |
| JP2006240465A (en) * | 2005-03-03 | 2006-09-14 | Hitachi Ltd | Electric power steering device |
| JP2010266108A (en) * | 2009-05-14 | 2010-11-25 | Sharp Corp | Ceiling fan |
| CN201610862U (en) * | 2010-03-26 | 2010-10-20 | 保定惠阳航空螺旋桨制造厂 | Anti-static fan blade |
| CN102996510A (en) * | 2011-09-15 | 2013-03-27 | 中航商用航空发动机有限责任公司 | Hollow blade |
| US9360020B2 (en) * | 2014-04-23 | 2016-06-07 | Electric Torque Machines Inc | Self-cooling fan assembly |
| CN105221451A (en) * | 2014-06-27 | 2016-01-06 | 上海市格致中学 | One revolves watering vapour cooling ceiling fan |
| CN204164033U (en) * | 2014-08-28 | 2015-02-18 | 中航商用航空发动机有限责任公司 | Hollow fan blade for aircraft engine |
| CN104285822A (en) * | 2014-09-29 | 2015-01-21 | 丁玉清 | Cooling and odor removing ceiling fan for pigsty |
| CN107084150A (en) * | 2016-11-10 | 2017-08-22 | 上海沃克通用设备有限公司 | Resisting blower axle |
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2018
- 2018-03-13 CN CN201810203795.4A patent/CN108443178B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW354620U (en) * | 1997-10-13 | 1999-03-11 | Xiang-Heng Tang | Improvement of casing and blade support for ceiling fan |
| CN104314846A (en) * | 2014-10-15 | 2015-01-28 | 洛阳北玻台信风机技术有限责任公司 | Industrial large fan with fan protection measures |
| TWM530888U (en) * | 2016-06-14 | 2016-10-21 | Jian-Xuan Lin | Blade |
| CN208364426U (en) * | 2018-03-13 | 2019-01-11 | 吴江市大印墨风力发电机制造有限公司 | A kind of fan |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108443178A (en) | 2018-08-24 |
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