CN104235616B - Positive/negative pressure protector - Google Patents
Positive/negative pressure protector Download PDFInfo
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- CN104235616B CN104235616B CN201410490357.2A CN201410490357A CN104235616B CN 104235616 B CN104235616 B CN 104235616B CN 201410490357 A CN201410490357 A CN 201410490357A CN 104235616 B CN104235616 B CN 104235616B
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- ftercompction
- pipeline
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- pressure
- plate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
Present invention relates particularly to the improvement of positive/negative pressure protector.Purpose is to provide a kind of small positive/negative pressure protector of startup pressure; including the casing with upper and lower two chambers; the upper chamber of casing is connected with lower chambers by vertically arranged passage, and the pressure relief plate that sealing is formed to it is provided with the top of passage, and pressure relief plate forms be hinged in side with passage；It is provided with casing for connecting open to atmosphere relief pipeline, relief pipeline connection upper chamber；It is provided with casing and enters outlet pipe for connect biogas main pipeline, enters outlet pipe connection lower chambers；The open to atmosphere ftercompction pipeline of the company of being provided with casing, ftercompction pipeline communication lower chambers, ftercompction pipeline are provided with the ftercompction plate that sealing is formed to ftercompction pipeline between lower chambers, and ftercompction plate is vertically arranged, and are formed on top with ftercompction pipeline be hinged.The present invention is simple in construction, using anhydrous design, low voltage starting, is not influenceed by temperature, and effectively positive/negative-pressure protection can be played to fermentation tank, gas storage holder and pipe-line system.
Description
Technical field
The invention belongs to bionethanation system pressure protective device, and in particular to the improvement of positive/negative pressure protector.
Background technology
No matter biogas production industry is required for setting the protection of malleation in marsh-gas fermentation tank, gas storage holder or pipe-line system
Pressure release value and the generation for avoiding negative pressure, the system of protection are typically protected with water seal as positive pressure protection or negative pressure.Work as natural pond
When gas fermentation tank, gas storage holder or pipe-line system pressure are less than certain value, system can be by blast pipe inspiration air by negative-pressure balancing
Fall, when marsh-gas fermentation tank, gas storage holder or pipe-line system pressure are less than certain value, system discharge biogas carries out pressure release, ensures to set
It is standby safe for operation.But such protection system has a common fault：When temperature is less than 0 DEG C, water will freeze, so as to lose
Protective effect.
In addition, also have the various pressure protectors that positive/negative-pressure protection is carried out using other modes on the market, but this kind of protection
The pressure-activated value that device is directed to is general all higher.For example the patent of invention of Patent No. 201120478597.2 discloses a kind of work
Plug positive/negative pressure protector, positive-pressure protecting device and negative-pressure protection device are set respectively, piston is promoted in outer barrel by air pressure
The change of piston position caused by sliding up and down realizes that positive/negative-pressure is protected.The positive/negative pressure protector must be by positive-pressure protecting device
It is provided separately with the structure of negative-pressure protection device, its function could be realized, it is impossible to realize that positive/negative-pressure protects integrated setting, it is raw
The cost of production, installation and maintenance is higher.
The content of the invention
Start the small positive/negative pressure protector of pressure it is an object of the invention to provide a kind of, can to fermentation tank, gas storage holder and
Pipe-line system plays effectively positive/negative-pressure protection.
For achieving the above object, the technical solution adopted in the present invention is：A kind of positive/negative pressure protector, including with
The casing of upper and lower two chambers, the upper chamber of the casing is connected with lower chambers by vertically arranged passage, on the top of passage
The pressure relief plate that sealing is formed to it is provided with, pressure relief plate forms be hinged in side with passage；
It is provided with the casing for connecting open to atmosphere relief pipeline, the upper chamber of the relief pipeline connection casing；
Be provided with the outlet pipe that enters for connecting biogas main pipeline on the casing, it is described enter outlet pipe connection casing
Lower chambers；
The open to atmosphere ftercompction pipeline of the company of being provided with the casing, the lower chambers of the ftercompction pipeline communication casing are described
Ftercompction pipeline is provided with the ftercompction plate that sealing is formed to ftercompction pipeline between lower chambers, and the ftercompction plate is vertically arranged,
Top forms be hinged with ftercompction pipeline.
Preferably：It is provided with dismountable balancing weight on the pressure relief plate, the balancing weight on the pressure relief plate is multiple, and
Counterweight number of blocks can be increased and decreased.
Preferably：The outer end connection spark arrester of the ftercompction pipeline.
Preferably：The top of the passage is higher than the bottom of upper chamber, the bottom of the ftercompction pipeline and the bottom of lower chamber
Gap is left between portion.
Preferably：Two condensations for being respectively communicated with upper chamber bottom and lower chambers bottom are provided with the outer wall of the casing
Water overfall, drain valve is configured on the condensed water overfall.
Preferably：The level meter vertical with ftercompction plate is provided with outside the casing, there is mounting bracket outside the casing.
Foregoing arbitrary structures can be further preferably：The outside of the casing is provided with pressure release instruction device, described
Pressure release instruction device is made up of pressure release indicator board and pressure release instruction ball, and the pressure release instruction ball is connected by rope yarn with pressure relief plate,
One end of rope yarn is fixed with pressure release instruction ball, and the other end is consolidated after cabinet exterior is passed through higher than the position of pressure relief plate with pressure relief plate
It is fixed.
Preferably：The rope yarn is stainless steel wire rope yarn.
Foregoing arbitrary structures can be further preferably：The outside of the casing is provided with ftercompction instruction device, described
Ftercompction instruction device is made up of ftercompction indicator board and ftercompction instruction ball, and the ftercompction instruction ball is connected by rope yarn with ftercompction plate,
One end of rope yarn and ftercompction instruction ball are fixed, the other end after the bottom outer wall being located at through ftercompction pipeline outside casing with ftercompction
Plate is fixed.
Preferably：The rope yarn is stainless steel wire rope yarn.
The invention has the advantages that：The present invention is designed research and development for minute-pressure, the advantage is that：
1) it is anhydrous, it will not freeze, be adapted to north of china in winter to use.
2) negative pressure protection start point be able to can accomplish extremely close to 0Pa (i.e. in casing pressure close to ambient pressure)-
10Pa is (i.e.：Pressure ratio ambient pressure only low 10Pa in casing) start, thoroughly prevent pipe negative pressure.
3) positive pressure protection, which starts point, to meet the needs of different positive pressure protections by adjusting balancing weight, minimum to do
To 300Pa (i.e.：The high 300Pa of pressure ratio ambient pressure in casing) start.
4) duct size and casing can change, and being adapted to the flow pressure release of the overwhelming majority, (including malleation pressure release and negative pressure are let out
Pressure) requirement.
5) positive pressure protection structure and the integration of negative pressure protection structure, it is easy for installation.
6) this protector is purely mechanic, without powered part, also not delay use even if having a power failure, that is, accomplish accessible guarantor
Shield.
7) it is made of 304 stainless steels, antiseptic power is strong.
8) positive pressure protection and the breakdown action and opening degree of negative pressure protection be can see that.
9) detection system can be installed, with interlink electric warning system.
10) negative pressure protection part installation spark arrester, prevents negative pressure tempering phenomenon.
11) it is simple in construction, it is hardly damaged.
12) can be with possible condensed water in vent tank body.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Embodiment
It is as shown in Figure 1, a kind of positive/negative pressure protector, including casing 22, enter outlet pipe 19, relief pipeline 20 and ftercompction
Pipeline 21.The casing 22 is separated into upper and lower two separate chambers, i.e. upper chamber and lower chambers by horizontal baffle 24.
It is described enter outlet pipe 19 one end connected with lower chambers, entering the other end of outlet pipe 19 has ring flange A14,
Enter outlet pipe 19 to be attached by ring flange A14 and biogas main pipeline, be the biogas in biogas main pipeline by entering outlet
Pipeline 19 enters bottom chamber.
One end of the relief pipeline 20 connects with upper chamber, and the other end has ring flange B16, and relief pipeline 20 passes through method
Blue disk B16 is attached with even open to atmosphere extraneous pipeline 12, air is entered upper chamber, and release lower chambers
The biogas of upper chamber is discharged into air through relief pipeline 20 and extraneous pipeline 12 successively, and the pipeline opening of extraneous pipeline 12 is located higher than
The position that more than 2 meters of ground, with avoid Mars light pipeline opening release biogas, and extraneous pipeline 12 pipeline opening bending
With downward, to prevent rainwater from being flowed into from pipeline opening in upper chamber.
Upper chamber is connected with lower chambers by vertically arranged passage 11, is provided with the top of passage 11 and is formed sealing to it
The sealing structure on pressure relief plate 1, pressure relief plate 1 and the top of passage 11 is made by the gravity of pressure relief plate 1 itself and the pressure of air
Pressure relief plate 1 is in close contact with the top of passage 11, and realizes the sealing to the top of passage 11.In order to ensure pressure relief plate 1 to passage 11
Top is fully sealed, and can be realized by following several ways：It is 1. close in pressure relief plate 1 and the setting of the top corresponding position of passage 11
Packing, by the self gravitation of pressure relief plate 1 and the pressure compaction sealing gasket of air, realize the sealing to the top of passage 11；2.
Sealing gasket is set on the top of passage 11, by the self gravitation of pressure relief plate 1 and the pressure compaction sealing gasket of air, realized to logical
The sealing on the top of road 11；3. being respectively provided with mutually corresponding sealing gasket on the top of passage 11 and pressure relief plate 1, pass through pressure relief plate 1
Self gravitation and air pressure compaction sealing gasket, realize the sealing to the top of passage 11.Those skilled in the art should
Know, in the prior art if other sealing structures are also adapted to the present invention, and the effect of the present invention can be reached,
It can be applied in technical scheme, then should be included with the scope of the present invention.
The outer wall of the side of the pressure relief plate 1 in the horizontal direction and passage 11 is formed by articulated elements 6 to be hinged, and is existed with realizing
When needing pressure release, the opposite side of pressure relief plate 1 may exit off the top of passage 11, realize the unlatching on the top of passage 11, make upper chamber with
Lower chambers communicate.Articulated elements 6 belongs to existing structure, and its structure can be selected according to actual conditions, is let out as long as can realize
The structure of articulated elements 6 of the opening and closing of pressing plate 1, it is applied to the present invention.
In order to meet the needs of different positive pressure protections, dismountable balancing weight 2 is provided with pressure relief plate 1, balancing weight 2 is matched somebody with somebody
It is set to multiple, the quantity of the balancing weight 2 on pressure relief plate 1 is increased and decreased, you can the pressure release of regulation malleation release starts pressure value
Size.In the present embodiment, the connected mode of balancing weight 2 is as follows：A vertical loop bar is fixed at the top of pressure relief plate 1,
The sets of holes coordinated with loop bar gap are opened up on balancing weight 2, balancing weight 2 is set on loop bar by the sets of holes, and loop bar top is set
The end of thread is put, and is furnished with nut, tightening nut can compress balancing weight 2.In order to ensure the gravity of pressure relief plate 1 and balancing weight 2
It is evenly distributed, loop bar is fixed on the top center of pressure relief plate 1, and sets of holes are opened in the center of balancing weight 2.
In order to clearly learn positive pressure protection state, the scheme that the present invention uses is the work by showing pressure relief plate 1
As state come what is realized, its concrete structure is as follows：Outside in casing 22 sets pressure release instruction device, the pressure release instruction device
It is made up of pressure release indicator board 5 and pressure release instruction ball 4, the pressure release instruction ball 4 is connected by stainless steel wire rope yarn A3 and pressure relief plate 1
Connect.The through hole slided for stainless steel wire rope yarn A3 in it, stainless steel are offered higher than the position of pressure relief plate 1 in the outer wall of casing 22
Cord line A3 one end and pressure release instruction ball 4 are fixed, and the other end with pressure relief plate 1 through fixing after through hole.When pressure relief plate 1 is opened
When, pressure release instruction ball 4 moves down, in order to be intuitive to see the displacement of pressure release instruction ball 4, in pressure release indicator board 5
Upper setting graduation mark.
The ftercompction pipeline 21 is horizontally disposed, its one end connection air, and has ring flange C15, ftercompction pipe at the end
Road 21 prevents negative pressure tempering phenomenon by ring flange C15 connections spark arrester 17.
The other end of the ftercompction pipeline 21 is connected with lower chambers, and ftercompction pipeline 21 is provided between lower chambers to mending
The end of pressure pipeline 21 forms the ftercompction plate 7 of sealing, and the ftercompction plate 7 is vertically arranged, passed through on top and ftercompction pipeline 21
Articulated elements 6, which is formed, to be hinged, and to realize when needing ftercompction, the opposite side of ftercompction plate 7 may exit off the end of ftercompction pipeline 21, realize
The unlatching of ftercompction pipeline 21, makes lower chambers be communicated with air.
In order to ensure that the end of ftercompction pipeline 21 is fully sealed ftercompction plate 7, can be realized by following several ways：
1. under pressure relief plate 1 and the end corresponding position of ftercompction pipeline 21 setting sealing gasket, normal operating conditions, the biogas pressure of bottom chamber
More than external atmospheric pressure, and sealing gasket is compressed, realize the sealing to the end of ftercompction pipeline 21；2. set in the end of ftercompction pipeline 21
Sealing gasket is put, sealing gasket is compressed by the biogas pressure of bottom chamber, realizes the sealing to the end of ftercompction pipeline 21；3. in pressure release
Plate 1 is respectively provided with mutual corresponding sealing gasket with the end of ftercompction pipeline 21, and sealing gasket is compressed by the biogas pressure of bottom chamber, real
Now to the sealing of the end of ftercompction pipeline 21.Those skilled in the art are it is to be understood that in the prior art if others seal
Structure is also adapted to the present invention, and can reach the effect of the present invention, can be applied in technical scheme,
Then it should be included with the scope of the present invention.
The outside of the casing 22 is provided with ftercompction instruction device, and the ftercompction instruction device is by ftercompction indicator board 10 and mends
Pressure instruction ball 9 is formed, and the ftercompction instruction ball 9 is connected by stainless steel wire rope yarn with ftercompction plate 7, one end of stainless steel wire rope yarn
Fixed with ftercompction instruction ball 9, the other end is solid with ftercompction plate 7 after the bottom outer wall being located at through ftercompction pipeline 21 outside casing 22
It is fixed.
In order to clearly learn negative pressure guard mode, the scheme that the present invention uses is the work by showing ftercompction plate 7
As state come what is realized, its concrete structure is as follows：Outside in casing 22 sets ftercompction instruction device, the ftercompction instruction device
It is made up of ftercompction indicator board 10 and ftercompction instruction ball 9, the ftercompction instruction ball 9 is connected by stainless steel wire rope yarn B8 and ftercompction plate 7
Connect.Offer in the bottom outer wall that ftercompction pipeline 21 is located at outside casing 22 and lead to for what stainless steel wire rope yarn B8 was slided in it
Hole, stainless steel wire rope yarn B8 one end and ftercompction instruction ball 9 are fixed, and the other end is consolidated through the top after through hole with ftercompction plate 7
It is fixed.When ftercompction plate 7 is opened, ftercompction instruction ball 9 move down, in order to be intuitive to see ftercompction instruction ball 9 movement away from
From setting graduation mark on ftercompction indicator board 10.In order to ensure the initiation value of negative pressure protection as best one can close to external atmospheric pressure,
The quality settings of ftercompction instruction ball 9 obtain very small, and stainless steel wire rope yarn B8 and ftercompction plate 7 tie point are tried one's best top set
Put, as long as it is sufficient to be able to observe that the little by little movement of ftercompction instruction ball 9.
In order to prevent issuable condensed water from being had undesirable effect to positive/negative-pressure protection structure, the top of the passage 11
Higher than the bottom of upper chamber, the bottom of the ftercompction pipeline 21 is higher than the bottom of lower chamber, makes the bottom of ftercompction pipeline 21 with
Gap is left between the bottom of cavity.It is provided with the outer wall of the casing 22 and is respectively communicated with upper chamber bottom and lower chambers bottom
Two condensed water overfalls, drain valve 13 is configured on the condensed water overfall.Drain valve 13 is used in certain period of time
Discharge the condensed water of upper chamber and lower chambers.
The outside of the casing 22 has mounting bracket 23, for casing 22 to be fixed into installation, on the top of casing 22
Portion is provided with the level meter 18 vertical with ftercompction plate 7, during installation, by adjusting the horizontal level of level meter 18, i.e.,
The upright position of level meter 18 can be played a part of adjusting, to ensure the perpendicularity of ftercompction plate 7, that is, ensure that negative pressure is protected
The degree of accuracy of initiation value.
Generally speaking, it using the flowing of gas is the big ground directional pressure of pressure forever that the design of this positive/negative pressure protector, which is,
The mobile principle in small place.Assuming that highest pressure release value desired by biogas main pipeline is P1, prevent from bearing desired by biogas main pipeline
The ftercompction value of pressure is P2.Biogas main pipeline routine work pressure is P, environmental pressure P0, then P1 ＞ P ＞ P0 ＞ P2 are only just
Normal working condition.In order to ensure the safety of equipment, P2 should approach with P0 as best one can, i.e. P2 ≈ P0.
The operation principle of this positive/negative pressure protector：When biogas main pipeline is full of biogas, lower chambers will be full of biogas, natural pond
Atmospheric pressure must be P, must be now P ＞ P0, and the gravity of P ＜ P0+ balancing weights 2 and pressure relief plate 1, therefore pressure relief plate 1 is to close
Close.As P ＞ P1, the gravity of P ＞ P0+ balancing weights 2 and pressure relief plate 1, pressure relief plate 1 may turn on, and the gas of biogas pipeline is just
Upper chamber can be flowed out to by lower chambers and arrive surrounding air again, so as to reach pressure release effect；As P ＜ P2, ftercompction plate 7 will be opened
Open, now outside air enters lower chambers, and P ＜ P0 are not allowed so as to reach, that is, does not allow the pressure of biogas pipeline to be less than the external world
Pressure, thus play the possibility for preventing biogas pipeline from producing negative pressure.For only P in P1 ＞ P ＞ P0, pressure relief plate 1 and ftercompction plate 7 are
It is closure.It is now normal working condition.Indicate that ball 4 and ftercompction indicate that ball 9 indicates in pressure release respectively by observing pressure release
Relative position on plate 5 and ftercompction indicator board 10, it is possible to know the opening degree of pressure relief plate 1 and ftercompction plate 7.
Due to pressure release indicate ball 4 and ftercompction instruction ball 9 mainly play indicative function, the weight of the two as far as possible design ground compared with
Gently, the weight of particularly ftercompction instruction ball 9 can play some influences to the unlatching of ftercompction plate 7, therefore by stainless steel wire rope yarn B8
With the tie point also top setting as far as possible of ftercompction plate 7, selection one, which can be played, allows ftercompction instruction ball 9 to move, and to ftercompction plate 7
Unlatching caused by the minimum position of resistance.If the ftercompction initiation value that according to demand, protect negative pressure reduces, can also lead to
The weight for crossing increase ftercompction instruction ball 9 is adjusted.In addition, ftercompction instruction device is removed, although losing ftercompction instruction
Effect, but can now reach ftercompction value P2=P0, as long as the biogas pressure P that is, in biogas main pipeline is less than ambient pressure P0
Ftercompction plate 7 is just opened at once, is thoroughly prevented biogas main pipeline and is in negative pressure state.
Claims (6)
- A kind of 1. positive/negative pressure protector, it is characterised in that：Including the casing with upper and lower two chambers, the upper chamber of the casing Connected with lower chambers by vertically arranged passage, the pressure relief plate that sealing is formed to it is provided with the top of passage, pressure relief plate exists Side forms be hinged with passage；It is provided with dismountable balancing weight on the pressure relief plate, the balancing weight on the pressure relief plate is more It is individual, and counterweight number of blocks can be increased and decreased；It is provided with the casing for connecting open to atmosphere relief pipeline, the upper chamber of the relief pipeline connection casing；Be provided with the outlet pipe that enters for connecting biogas main pipeline on the casing, it is described enter outlet pipe connection casing under Chamber；The open to atmosphere ftercompction pipeline of the company of being provided with the casing, the lower chambers of the ftercompction pipeline communication casing, the ftercompction Pipeline is provided with the ftercompction plate that sealing is formed to ftercompction pipeline between lower chambers, and the ftercompction plate is vertically arranged, on top Formed with ftercompction pipeline be hinged；The outside of the casing is provided with pressure release instruction device, and the pressure release instruction device indicates ball by pressure release indicator board and pressure release Composition, the pressure release instruction ball are connected by rope yarn with pressure relief plate, and one end and the pressure release instruction ball of rope yarn are fixed, and the other end is in height Fixed after the position of pressure relief plate passes through cabinet exterior with pressure relief plate；The outer end connection spark arrester of the ftercompction pipeline.
- 2. positive/negative pressure protector according to claim 1, it is characterised in that：The top of the passage is higher than the bottom of upper chamber Portion, gap is left between the bottom of the ftercompction pipeline and the bottom of lower chamber.
- 3. positive/negative pressure protector according to claim 1, it is characterised in that：It is provided with the outer wall of the casing and connects respectively Lead to two condensed water overfalls of upper chamber bottom and lower chambers bottom, drain valve is configured on the condensed water overfall.
- 4. positive/negative pressure protector according to claim 1, it is characterised in that：It is provided with outside the casing vertical with ftercompction plate Level meter, there is mounting bracket outside the casing.
- 5. the positive/negative pressure protector according to any one in claim 1 to 4, it is characterised in that：The outside of the casing Ftercompction instruction device is provided with, the ftercompction instruction device is made up of ftercompction indicator board and ftercompction instruction ball, the ftercompction instruction Ball is connected by rope yarn with ftercompction plate, and one end and the ftercompction instruction ball of rope yarn are fixed, and the other end is being located at case through ftercompction pipeline Fixed after bottom outer wall outside body with ftercompction plate.
- 6. positive/negative pressure protector according to claim 5, it is characterised in that：The ftercompction instruction device fills with pressure release instruction In putting, rope yarn is stainless steel wire rope yarn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410490357.2A CN104235616B (en) | 2014-09-23 | 2014-09-23 | Positive/negative pressure protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410490357.2A CN104235616B (en) | 2014-09-23 | 2014-09-23 | Positive/negative pressure protector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104235616A CN104235616A (en) | 2014-12-24 |
| CN104235616B true CN104235616B (en) | 2018-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410490357.2A Active CN104235616B (en) | 2014-09-23 | 2014-09-23 | Positive/negative pressure protector |
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| CN (1) | CN104235616B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108676713A (en) * | 2018-06-11 | 2018-10-19 | 焦作市华中能源科技有限公司 | A kind of balance biogas fermentation pressure hydrolock positive/negative pressure protector and its application method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106754279B (en) * | 2016-11-28 | 2019-05-03 | 安阳工学院 | A kind of anhydrous positive/negative pressure protective device of biogas dual fail-safe and its guard method |
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| CN2634262Y (en) * | 2003-07-21 | 2004-08-18 | 宝山钢铁股份有限公司 | Gas anti-explosion automatic sealing device |
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| CN108676713A (en) * | 2018-06-11 | 2018-10-19 | 焦作市华中能源科技有限公司 | A kind of balance biogas fermentation pressure hydrolock positive/negative pressure protector and its application method |
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| Publication number | Publication date |
|---|---|
| CN104235616A (en) | 2014-12-24 |
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