CN203395906U - Improved high-pressure heater drainage system - Google Patents
Improved high-pressure heater drainage system Download PDFInfo
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- CN203395906U CN203395906U CN201320288590.3U CN201320288590U CN203395906U CN 203395906 U CN203395906 U CN 203395906U CN 201320288590 U CN201320288590 U CN 201320288590U CN 203395906 U CN203395906 U CN 203395906U
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Abstract
The utility model discloses an improved high-pressure heater drainage system. The system comprises a water-feeding pipeline, a booster pump, a water-feeding pump and high-pressure heaters, wherein the booster pump, the water-feeding pump and the high-pressure heaters are successively arranged on the water-feeding pipeline along a water flow direction. The system is characterized in that there are at least two high-pressure heaters; the first two high-pressure heaters in a water flow direction are respectively a first stage high-pressure heater and a second high-pressure heater; a drainage pipeline is arranged between the second stage high-pressure heater and an outlet of the booster pump; and to-be-drained water in the second stage high-pressure heater is drained into the outlet of the booster pump. According to the utility model, a squeezing effect on subordinate steam extraction caused by water drainage of the high-voltage heaters is avoided, loss of pressure during the water drainage of the high-pressure heaters is reduced, and economical efficiency of a machine set is enhanced.
Description
Technical field
The utility model relates to field, power plant, relates to particularly a kind of high-pressure heater draining system of power plant.
Background technology
At present, the feed-water heater that in modernization big power station, steam turbine generator adopts is mainly divided into contact(-type) heater and face formula heater.Wherein, contact(-type) heater utilizes steam Direct Contact Heating, and its end is poor is zero, water can be heated to the corresponding saturation temperature of steam pressure, can obtain best thermal cycle effect, and heat-economy is higher than there being the poor surface heater of end.But after employing contact(-type) heater, in order to make water can continue to flow to boiler, each contact(-type) heater outlet must be equipped with water pump.And, the more difficult realization on technique is manufactured of high pressure mixing formula heater.Thereby it is hybrid conventionally to only have oxygen-eliminating device to adopt, to meet the requirement of feedwater deaeration.
For face formula heater, the hydrophobic collection mode of its vapour side mainly contains two kinds: the one, and utilize the vapour side pressure of adjacent heater poor, make hydrophobicly in the mode of flowing automatically step by step, to collect; The 2nd, adopt drainage pump, by hydrophobic, squeeze in these heater outlet current.In these two kinds of hydrophobic modes, adopt the economy of drainage pump mode to be better than the hydrophobic mode of flowing automatically step by step, thereby conventionally in low-pressure heater draining system, adopt the mode of drainage pump, this mode also can reduce a large amount of hydrophobic low-temperature receiver heat loss that flow directly into condenser and increase and condensate pump load, but for high-pressure heater draining system, if adopt small flow high pressure drainage pump, efficiency is low and cost is high, and reliability reduces.Therefore in high-pressure heater draining system, be all to adopt the hydrophobic mode of flowing automatically step by step at present.
But theoretical according to existing Thermal Power Station, the corresponding part of heater that the hydrophobic mode of flowing automatically step by step can be squeezed hydrophobic inflow is drawn gas, thereby has reduced heat-economy.And in fact, adopt the hydrophobic mode of flowing automatically step by step, except the heat-economy loss that subordinate draws gas caused is squeezed in meeting, hydrophobic energy also can devalue, because hydrophobic pressure loss of energy own also can be very large.High-pressure heater draining system adopts the mode of flowing automatically step by step, finally comes together in oxygen-eliminating device, and in gravity flow process step by step, its pressure constantly reduces, and energy constantly devalues.In addition, come together in the hydrophobic of oxygen-eliminating device and by fore pump and feed pump, promote its pressure and send into boiler again, thus the wasted work of increase pump.
Utility model content
Because the above-mentioned defect of prior art, the utility model is intended to solve the hydrophobic technical problem of squeezing and reducing the hydrophobic pressure energy loss of high-pressure heater that subordinate is drawn gas of high-pressure heater.
For solving above technical problem, the utility model is achieved through the following technical solutions:
A high-pressure heater draining system, comprises feedwater piping, along feedwater flow to the fore pump, feed pump and the high-pressure heater that are successively set on described feedwater piping; Wherein, the number of described high-pressure heater is at least two, along feedwater flow to the first two respectively be first order high-pressure heater, second level high-pressure heater; Between described second level high-pressure heater and the outlet of described fore pump, the first drain water piping is set, described second level high-pressure heater is hydrophobic to be dredged into described fore pump and is exported by the first drain water piping, enters described feed pump together with after mixing with the feedwater of described fore pump outlet.
In technique scheme, every one-level of described high-pressure heater can be a high-pressure heater, or two high-pressure heater parallel connections, or the connected mode of a plurality of high-pressure heaters is series connection and the mode combining in parallel.
Preferably, in technique scheme, described high-pressure heater is divided into three grades, along feedwater flow to respectively being first order high-pressure heater, and second level high-pressure heater, third level high-pressure heater.
In technique scheme, described feedwater piping is also provided with along feedwater flow to the oxygen-eliminating device that is positioned at described fore pump front end.
In technique scheme, described feedwater piping is also provided with along feedwater flow to the low-pressure heater that is positioned at described oxygen-eliminating device entrance front end.
In technique scheme, between described third level high-pressure heater and described second level high-pressure heater, the 4th drain water piping is set, described third level high-pressure heater is hydrophobic to be dredged into described second level high-pressure heater by the 4th drain water piping.
In technique scheme, between described first order high-pressure heater and described oxygen-eliminating device, the 3rd drain water piping is set, the hydrophobic of first order high-pressure heater dredged into oxygen-eliminating device by the 3rd drain water piping.
The present invention has also disclosed a kind of improved high-pressure heater draining system, comprises feedwater piping, along feedwater flow to the fore pump, feed pump and the high-pressure heater that are successively set on described feedwater piping; It is characterized in that, described high-pressure heater is divided into three grades, along feedwater flow to respectively being first order high-pressure heater, and second level high-pressure heater, third level high-pressure heater; Between the outlet of described second level high-pressure heater and described fore pump, the first drain water piping is set, hydrophobic in described second level high-pressure heater dredged into described fore pump and exported by the first drain water piping.
Alternatively, the hydrophobic pressure of high-pressure heater is slightly larger than fore pump outlet feed pressure, to reduce the hydrophobic pressure loss of high-pressure heater as far as possible, can directly utilize like this this pressure reduction that the hydrophobic of high-pressure heater dredged to fore pump outlet, and system is simple, invests low.
Alternatively, the hydrophobic pressure of high-pressure heater is greater than fore pump outlet feed pressure, on the first drain water piping, can install a pressure regulator valve additional, to control the hydrophobic pressure of high-pressure heater, prevents the hydrophobic emptying and pipe vibration of high-pressure heater.
Alternatively, the hydrophobic pressure of high-pressure heater is less than fore pump outlet feed pressure, can on the first drain water piping, install drainage pump additional dredges the hydrophobic of high-pressure heater into fore pump outlet feedwater piping, also can be by adjusting fore pump outlet pressure, make fore pump outlet feed pressure be slightly less than the hydrophobic pressure of high-pressure heater, thereby realize the hydrophobic of high-pressure heater, dredge to fore pump outlet feedwater piping.
Further, described high-pressure heater hydrophobic dredged by the first drain water piping hydrophobic first drain water piping that passes through that also can be understood as described high-pressure heater to preposition delivery side of pump and dredges to the feedwater piping between described feed pump and fore pump, and hydrophobic first drain water piping that passes through that also can be understood as described high-pressure heater is dredged the import to described feed pump.
It should be noted that the utility model is intended to protect a kind of hydrophobic method that subordinate is drawn gas and squeezes impact and reduce hydrophobic pressure energy loss of avoiding.The utility model is in having studied the loss of the hydrophobic mode of flowing automatically step by step, except squeezing loss, also there is the pressure loss, make up the deficiency to the hydrophobic mode theoretical research of flowing automatically step by step in existing Thermal Power Station theoretical system, thereby proposed the hydrophobic mode of a kind of novel high-pressure heater.Therefore, any research based on this theory and the measure of the hydrophobic pressure loss of reduction high-pressure heater that proposes all should be in the determined protection domain by claims.
The beneficial effects of the utility model are:
1. with respect to traditional hydrophobic mode step by step, high-pressure heater of the present utility model is hydrophobic enters fore pump outlet, thus avoided this grade of high-pressure heater hydrophobic subordinate is drawn gas squeeze impact, reduced this grade of hydrophobic pressure loss; In addition, because high-pressure heater is hydrophobic, do not enter fore pump, the feedwater flow that enters fore pump is reduced, thereby reduced the wasted work of fore pump.
2. the utility model does not enter oxygen-eliminating device mixing because part high-pressure heater is hydrophobic, thereby relatively can increase the amount of drawing gas of oxygen-eliminating device, is equivalent to increase the inferior amount of drawing gas, thereby has improved heat-economy; And along with the amount of drawing gas increases, also can strengthen the deep deoxygenization ability of oxygen-eliminating device, be conducive to prevent the spontaneous boiling of oxygen-eliminating device, improve the margin of safety of oxygen-eliminating device.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, to those skilled in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the theory structure schematic diagram of the disclosed a kind of improved high-pressure heater draining system of the utility model.
In figure: the 1st, low-pressure heater; The 2nd, oxygen-eliminating device; The 3rd, fore pump; The 4th, feed pump; The 5th, first order high-pressure heater; The 6th, second level high-pressure heater; The 7th, third level high-pressure heater; The 9th, feedwater piping; 10 is first drain water pipings, and 11 is second drain water pipings; 12 is the 3rd drain water pipings; 13 is the 4th drain water pipings.
The specific embodiment
In order to understand better technique scheme of the present utility model, below in conjunction with drawings and Examples, describe in detail further.
The utility model provides a kind of improved high-pressure heater draining system, key point is the feature of utilizing water supply preposition pump discharge pressure not high, change the hydrophobic mode of flowing automatically step by step of original high-pressure heater, the high-pressure heater of the corresponding hydrophobic no longer Shi Shuru of high-pressure heater subordinate, but dredge into water supply preposition pump discharge, thereby avoid this grade of high-pressure heater hydrophobic subordinate is drawn gas squeeze impact, reduced the hydrophobic pressure loss and the power consumption of fore pump simultaneously.
Improved high-pressure heater draining system of the present utility model, comprises feedwater piping 1, along feedwater flow to the fore pump 3, feed pump 4 and the high-pressure heater that are successively set on described feedwater piping; Wherein, the number of described high-pressure heater is at least two, along feedwater flow to the first two respectively be first order high-pressure heater 5, second level high-pressure heater 6; Between described second level high-pressure heater and 3 outlets of described fore pump, the first drain water piping 10 is set, described second level high-pressure heater is hydrophobic to be dredged into 3 outlets of described fore pump by the first drain water piping 10, enters described feed pump 4 together with after mixing with the feedwater of described fore pump 3 outlets.
Optionally, described high-pressure heater can be two high-pressure heater parallel connections, or the connected mode of a plurality of high-pressure heaters is series connection and the mode combining in parallel.
Preferably, in technique scheme, described high-pressure heater is divided into three grades, along feedwater flow to respectively being first order high-pressure heater 5, and second level high-pressure heater 6, third level high-pressure heater 7.
Particularly, as shown in Figure 1, be a specific embodiment of the present utility model, comprise the low-pressure heater 1, oxygen-eliminating device 2, fore pump 3, feed pump 4 and the high-pressure heater that by feedwater piping 9, are connected successively; Wherein, described high-pressure heater is divided into three grades, along feedwater flow to respectively being first order high-pressure heater 5, and second level high-pressure heater 6, third level high-pressure heater 7; Between described third level high-pressure heater 7 and described second level high-pressure heater, the 4th drain water piping 13 is set, the hydrophobic of described third level high-pressure heater enters second level high-pressure heater 6 by described the 4th drain water piping 13; Between described second level high-pressure heater 6 and fore pump 3 outlets, the first drain water piping 10 is set, described high-pressure heater 6 is hydrophobic to be dredged into fore pump 3 outlet by the first described drain water piping 10, enters feed pump 4 together with after mixing with the feedwater of fore pump 3 outlets.The 3rd drain water piping 12 is set between described first order high-pressure heater 5 and oxygen-eliminating device 2, and the hydrophobic of described first order high-pressure heater 5 dredged into oxygen-eliminating device 2 by described the 3rd drain water piping 12.
And in traditional high-pressure heater draining system, the main employing mode of flowing automatically step by step, as shown in fig. 1, third level high-pressure heater 7 is hydrophobic to be entered after second level high-pressure heater 6 by the 4th drain water piping 13, draw gas condensed hydrophobic be mixed by second drain water piping 11(as shown in phantom in Figure 1 corresponding to second level high-pressure heater 6) enter first order high-pressure heater 5, then draw gas condensed hydrophobic mixing corresponding to first order high-pressure heater 5 imports oxygen-eliminating device 2 by the 3rd drain water piping 12.
Can find out, be in second level high-pressure heater 6 hydrophobic different from conventional art of the utility model no longer dredged into first order high-pressure heater 5(as shown in phantom in Figure 1 by the second drain water piping 11), but dredge to fore pump 3 outlets by the first drain water piping 10.Therefore, because second level high-pressure heater 6 is hydrophobic, directly dredge into fore pump 3 outlets, the confluent that enters fore pump 3 is reduced, thereby reduce the wasted work of fore pump 3.In addition, the hydrophobic amount that enters oxygen-eliminating device 2 due to high-pressure heater also reduces, thereby the amount of drawing gas of oxygen-eliminating device 2 also increases thereupon.And oxygen-eliminating device 2 amounts of drawing gas increase, be equivalent to reduce cold source energy, therefore unit heat economy improves.
Further, in the present embodiment, the second traditional drain water piping 11 still can retain, once the hydrophobic of described second level high-pressure heater 6, by the first drain water piping 10, dredge to fore pump 3 and break down, still can switch back by the second drain water piping 11 and dredge into first order high-pressure heater 5.
The 1000MW unit of take is below made a concrete analysis of calculating to its economy as example.
The former high-pressure heater draining system of table 1 relevant parameter (THA operating mode)
| Fore pump outlet pressure (MPa) | 3.25 |
| Fore pump inlet flow rate (kg/s) | 758.967 |
| Fore pump shaft power (kW) | 2262 |
| Main steam enthalpy (kJ/kg) | 3486.2 |
| Heat content increment (kJ/kg) again | 576.7 |
| The second level high-pressure heater enthalpy (kJ/kg) that draws gas | 3087.2 |
| The hydrophobic pressure of second level high-pressure heater (MPa) | 5.78 |
| The hydrophobic flow of second level high-pressure heater (kg/s) | 123.974 |
| The hydrophobic enthalpy of second level high-pressure heater (kJ/kg) | 958.2 |
| The first order high-pressure heater amount of drawing gas (kg/s) | 30.784 |
| The first order high-pressure heater enthalpy (kJ/kg) that draws gas | 3388.4 |
| The hydrophobic amount of first order high-pressure heater (kJ/S) | 154.758 |
| The hydrophobic enthalpy of first order high-pressure heater (kJ/kg) | 826.6 |
| The oxygen-eliminating device amount of drawing gas (kg/s) | 25.612 |
| The oxygen-eliminating device enthalpy (kJ/kg) that draws gas | 3194.3 |
| Deaerator feedwater import enthalpy (kJ/kg) | 656.4 |
| Deaerator feedwater inlet flow rate (kJ/s) | 578.597 |
| Deaerator feedwater outlet enthalpy (kJ/kg) | 776.7 |
Table 1 has provided former high-pressure heater draining system relevant parameter (THA operating mode), according to above-mentioned data, substantially constant by oxygen-eliminating device outlet enthalpy, supposes that the amount of drawing gas that enters oxygen-eliminating device after transformation is X, by heat conservation:
X×3194.3+30.784×826.6+578.597×656.4=（X+578.597+30.784）×776.7。Can calculate after transformation, the oxygen-eliminating device amount of drawing gas X=28.16kg/s, increases 2.54kg/s relatively, thereby after transformation to enter fore pump flow be 637.5kg/s; Pump lift is substantially constant, therefore improved fore pump shaft power is 2262 * (637.5/758.967)=1900kW, fore pump shaft power reduces 362kW, is converted to rate of standard coal consumption, can be therefore and the about 0.11g/kWh that declines.
Thereafter, hydrophobic and the fore pump outlet feedwater of second level high-pressure heater mixes, and mix empty calory loss, due to the inlet temperature raising of first order high-pressure heater, thereby the hydrophobic amount of squeezing to first order high-pressure heater of second level high-pressure heater increases relatively.But due to the impact of squeezing having reduced oxygen-eliminating device, be equivalent to that first order high-pressure heater is squeezed to drawing gas of going out and send into next stage (oxygen-eliminating device), the acting amount that this draws gas increases, thus heat-economy raising, after transformation, doing work:
2.54×（3388.4－3194.3）＝493kW
Be converted to rate of standard coal consumption, therefore can be and the about 0.12g/kWh that declines.
More than comprehensive, can calculate the utility model and in above example, can reduce the about 0.23g/kWh of coal consumption.
It should be noted that the utility model is intended to protect a kind of hydrophobic method that subordinate is drawn gas and squeezes impact and reduce hydrophobic pressure energy loss of avoiding.The utility model is in having studied the loss of the hydrophobic mode of flowing automatically step by step, except squeezing loss, also there is the pressure loss, make up the deficiency to the hydrophobic mode theoretical research of flowing automatically step by step in existing Thermal Power Station theoretical system, thereby proposed the hydrophobic mode of a kind of novel high-pressure heater.Therefore, any research based on this theory and the measure of the hydrophobic pressure loss of reduction high-pressure heater that proposes all should be in the determined protection domain by claims.
Claims (10)
1. an improved high-pressure heater draining system, comprises feedwater piping, along feedwater flow to the fore pump, feed pump and the high-pressure heater that are successively set on described feedwater piping; It is characterized in that, described high-pressure heater is at least two-stage, along feedwater flow to front two-stage respectively be first order high-pressure heater, second level high-pressure heater; Between the outlet of described second level high-pressure heater and described fore pump, the first drain water piping is set, hydrophobic in described second level high-pressure heater dredged into described fore pump and exported by the first drain water piping.
2. improved high-pressure heater draining system as claimed in claim 1, is characterized in that, described feedwater piping is also provided with along feedwater flow to the oxygen-eliminating device that is positioned at described fore pump entrance front end.
3. improved high-pressure heater draining system as claimed in claim 2, is characterized in that, described feedwater piping is also provided with along feedwater flow to the low-pressure heater that is positioned at described oxygen-eliminating device entrance front end.
4. improved high-pressure heater draining system as claimed in claim 2 or claim 3, it is characterized in that, between described first order high-pressure heater and described oxygen-eliminating device, the 3rd drain water piping is set, hydrophobic in first order high-pressure heater dredged into oxygen-eliminating device by the 3rd drain water piping.
5. the high-pressure heater draining system as described in as arbitrary in claim 1-3, it is characterized in that, every one-level of described high-pressure heater can be a high-pressure heater, or two high-pressure heater parallel connections, or the connected mode of a plurality of high-pressure heaters is series connection and the mode combining in parallel.
6. an improved high-pressure heater draining system, comprises feedwater piping, along feedwater flow to the fore pump, feed pump and the high-pressure heater that are successively set on described feedwater piping; It is characterized in that, described high-pressure heater is divided into three grades, along feedwater flow to respectively being first order high-pressure heater, and second level high-pressure heater, third level high-pressure heater; Between the outlet of described second level high-pressure heater and described fore pump, the first drain water piping is set, hydrophobic in described second level high-pressure heater dredged into described fore pump and exported by the first drain water piping.
7. improved high-pressure heater draining system as claimed in claim 6, it is characterized in that, between described third level high-pressure heater and described second level high-pressure heater, the 4th drain water piping is set, hydrophobic in described third level high-pressure heater dredged into described second level high-pressure heater by the 4th drain water piping.
8. improved high-pressure heater draining system as claimed in claim 7, is characterized in that, described feedwater piping is also provided with along feedwater flow to the oxygen-eliminating device that is positioned at described fore pump entrance front end.
9. improved high-pressure heater draining system as claimed in claim 8, is characterized in that, described feedwater piping is also provided with along feedwater flow to the low-pressure heater that is positioned at described oxygen-eliminating device entrance front end.
10. improved high-pressure heater draining system as claimed in claim 9, it is characterized in that, between described first order high-pressure heater and described oxygen-eliminating device, the 3rd drain water piping is set, hydrophobic in first order high-pressure heater dredged into oxygen-eliminating device by the 3rd drain water piping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320288590.3U CN203395906U (en) | 2013-04-19 | 2013-05-23 | Improved high-pressure heater drainage system |
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| CN201310139144 | 2013-04-19 | ||
| CN201310139144.0 | 2013-04-19 | ||
| CN201320288590.3U CN203395906U (en) | 2013-04-19 | 2013-05-23 | Improved high-pressure heater drainage system |
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| CN203395906U true CN203395906U (en) | 2014-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320288590.3U Expired - Lifetime CN203395906U (en) | 2013-04-19 | 2013-05-23 | Improved high-pressure heater drainage system |
| CN201320288580.XU Expired - Lifetime CN203395907U (en) | 2013-04-19 | 2013-05-23 | Gradual flow type high-pressure drainage system with drainage pump |
| CN201320287900.XU Expired - Lifetime CN203395905U (en) | 2013-04-19 | 2013-05-23 | High-pressure heater drainage system with drainage pump |
| CN201310196111.XA Active CN104110674B (en) | 2013-04-19 | 2013-05-23 | A kind of high-pressure heater draining system |
| CN201320287898.6U Expired - Lifetime CN203395904U (en) | 2013-04-19 | 2013-05-23 | Improved gradual-flow type high-pressure heater drainage system |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320288580.XU Expired - Lifetime CN203395907U (en) | 2013-04-19 | 2013-05-23 | Gradual flow type high-pressure drainage system with drainage pump |
| CN201320287900.XU Expired - Lifetime CN203395905U (en) | 2013-04-19 | 2013-05-23 | High-pressure heater drainage system with drainage pump |
| CN201310196111.XA Active CN104110674B (en) | 2013-04-19 | 2013-05-23 | A kind of high-pressure heater draining system |
| CN201320287898.6U Expired - Lifetime CN203395904U (en) | 2013-04-19 | 2013-05-23 | Improved gradual-flow type high-pressure heater drainage system |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104121572A (en) * | 2014-08-05 | 2014-10-29 | 中国电力工程顾问集团西南电力设计院 | 1000MW stage secondary reheating unit single-row high-pressure heater system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01203804A (en) * | 1988-02-08 | 1989-08-16 | Hitachi Ltd | Feed water heater drain system |
| JP2692972B2 (en) * | 1989-08-04 | 1997-12-17 | 株式会社東芝 | Water heater Drain pump up device |
| CN102116469B (en) * | 2009-12-30 | 2013-06-12 | 中国电力工程顾问集团华东电力设计院 | Water supply and drainage system for medium-pressure heater of power plant |
| CN202349998U (en) * | 2011-10-19 | 2012-07-25 | 邹治平 | Condensed water and water supply deoxidizing system for thermal power plant |
| CN202403258U (en) * | 2011-11-22 | 2012-08-29 | 邹治平 | Water-supply steam-extraction regenerative heating system of coal-fired power plant |
-
2013
- 2013-05-23 CN CN201320288590.3U patent/CN203395906U/en not_active Expired - Lifetime
- 2013-05-23 CN CN201320288580.XU patent/CN203395907U/en not_active Expired - Lifetime
- 2013-05-23 CN CN201320287900.XU patent/CN203395905U/en not_active Expired - Lifetime
- 2013-05-23 CN CN201310196111.XA patent/CN104110674B/en active Active
- 2013-05-23 CN CN201320287898.6U patent/CN203395904U/en not_active Expired - Lifetime
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| Publication number | Publication date |
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| CN104110674B (en) | 2017-03-08 |
| CN203395904U (en) | 2014-01-15 |
| CN203395907U (en) | 2014-01-15 |
| CN104110674A (en) | 2014-10-22 |
| CN203395905U (en) | 2014-01-15 |
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Granted publication date: 20140115 |