CN101761491A - Multi-functional control valve of water pump - Google Patents
Multi-functional control valve of water pump Download PDFInfo
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- CN101761491A CN101761491A CN201010103041A CN201010103041A CN101761491A CN 101761491 A CN101761491 A CN 101761491A CN 201010103041 A CN201010103041 A CN 201010103041A CN 201010103041 A CN201010103041 A CN 201010103041A CN 101761491 A CN101761491 A CN 101761491A
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Abstract
The invention discloses a multi-functional control valve of a water pump, which comprises a valve body, particularly a general low-flow-resistance double-control-cavity hydraulic valve body, and is characterized by further comprising a constant-lift pilot valve and an electric three-way ball valve, wherein the constant-lift pilot valve comprises a pressure measuring chamber, an inlet, a first outlet and a second outlet, the current dividing ratio between the first outlet and the second outlet is controlled by the pressure of the pressure measuring chamber, the pressure measuring chamber is connected with an upstream cavity which is connected with the inlet via a first one-way valve, the first outlet is connected with an upper control cavity, and a second outlet is connected with a downstream cavity which is connected with the upper control cavity via a second one-way valve; and the electric three-way ball valve comprises a common end, an atmospheric end and a downstream cavity end, the common end is connected with the lower control cavity, the atmospheric end is communicated with the atmosphere, and the downstream cavity end is connected with the downstream cavity. The multi-functional control valve of the invention has the advantages of simple structure, high reliability and high performance price ratio. Therefore, the multi-functional control valve has wide application prospect and is capable of performing various controlling functions on the same valve through one-step adjustment.
Description
Technical field
The present invention relates to the hydraulic control valve gate technique, a kind of more specifically multi-functional control valve of water pump.
Background technique
Water pump is a hydraulic machinery, is widely used in the giving of every field, drainage system.Increase the surplus capacity problem by parameter when having design-calculated parameter accuracy and type selecting during the water pump design.But when actual motion, the ever-changing meeting of these parameter accuracys, surplus capacity and pipeline parameter directly influences the proper functioning of water pump.
There is a following puzzlement difficult problem in industry always when the water pump practical application now:
(1) water pump can hang down air horsepower (zero delivery) starting, to reduce the starting power of driving arrangement;
(2) water pump should remain on high efficient area work under ductwork pressure (device lift) fluctuates widely the condition that changes, to economize energy consumption;
(3) water pump should remain on the work of type selecting operating point, to guarantee supporting driving arrangement non-overloading under ductwork pressure (device lift) fluctuates widely the condition that changes;
(4) during many water pump parallel operations, keep every water pump in type selecting operating point work (equally loaded) separately, to guarantee supporting separately driving arrangement non-overloading;
(5) water pump remains on the work of type selecting operating point, to guarantee supporting driving arrangement non-overloading when under the condition that the blank pipe net is poured water (the device lift is zero);
(6) water pump keeps water not flow backwards under out-of-work condition, to guarantee to cut off the passage (non-return) that is connected with pipe network;
(7) under water pump reduction of speed, situation about stopping, preventing that water hammer from producing;
(8) can realize zero delivery termination of pumping (termination of pumping behind the valve of pass earlier);
(9) water pump is worked as reduction of speed, is stopped, and valve upstream and downstream pressure reduction very little (even being zero) is non-return initiatively;
(10) practicable emergency cut-off exit of pump (remote control ends).
Existing valve can only solve above certain or some difficult problem.
The patent No. is that the utility model patent of ZL200820301943 discloses a kind of multifunctional water pump control valve safe energy saving device, it comprises multifunctional water pump control valve, define spaced-apart epicoele and cavity of resorption in this multifunctional water pump control valve, safe energy saving device further comprises at least two respectively with the binary three-way solenoid valve of the epicoele of this multifunctional water pump control valve and cavity of resorption conducting and give the power supply of this two binary three-way solenoid valves power supplies; Be provided with delayer between each binary three-way solenoid valve and this power supply.
This control valve has the following disadvantages:
(1) it is unscientific opening that valve finishes by the control time, owing to want water pump to reach very difficult grasp of time of " rated power ", shifts to an earlier date and time expand all can impact effect.
(2) do not adopt the technology of two sections throttle downs, can not fundamentally eliminate " water hammer ".
(3) so-called " energy-conservation " is unscientific, if pure outlet valve, yes resistance the smaller the better (aperture maximum as far as possible), but whether water pump is energy-conservation, be to see whether it is operated in " efficient district ", and the adjustment of operating point increases (regulating the pipeline resistance coefficient) that the valve resistance is finished exactly.
(4) it adopts two two-position three way magnetic valves, and the electrical control logic is complicated, and the fault point is many, and the solenoid valve poor reliability, to the water quality requirement height, so this control valve rate of fault height.
Summary of the invention
The present invention is directed to the deficiencies in the prior art a kind of multi-functional control valve of water pump is provided.
Technological scheme of the present invention is as follows:
A kind of multi-functional control valve of water pump comprises valve body; Described valve body is general low flow resistance, two control chamber hydraulic control valve, comprises upstream cavity, downstream cavity, following control chamber and goes up control chamber; It is characterized in that also comprising permanent lift pilot valve and electric three passes ball valve; Described permanent lift pilot valve comprises pressure measuring chamber, inlet, first outlet and second outlet, the pressure control of the tested pressure of the shunting ratio chamber of first outlet and second outlet, pressure measuring chamber links to each other with upstream cavity, upstream cavity links to each other with inlet through first one-way valve, the flow direction of first one-way valve is that upstream cavity flows to inlet, first outlet links to each other with last control chamber, and second outlet links to each other with downstream cavity; Downstream cavity links to each other with last control chamber through second one-way valve, and the flow direction of second one-way valve is that downstream cavity flows to upward control chamber; The electric three passes ball valve comprises common port, atmosphere end and downstream cavity end, and common port links to each other with following control chamber, and atmosphere end communicates with atmosphere, and the downstream cavity end links to each other with downstream cavity.
Further, described permanent lift pilot valve comprises spring body, upper valve body and following valve body; Pressure measuring chamber is located in the upper valve body; Valve body all is located at down in inlet, first outlet and second outlet; The top of pressure measuring chamber is provided with diaphragm, bottom plate, upper spring, top board and adjusting bolt successively; The top of spring body is provided with and regulates the screw that bolt matches; The spring body is placed in inside with top board, upper spring and bottom plate and is fixed on the upper valve body; The below of bottom plate is provided with upper valve core, lower valve core and lower spring successively; Upper valve body is fixedlyed connected with following valve body; First outlet is controlled by upper valve core directly with the shunting ratio of second outlet, the displacement of upper valve core is subjected to the pressure control of pressure measuring chamber.
Further, be provided with the first Water flow adjusting valve door between the upstream cavity and first one-way valve.
Further, be provided with the second Water flow adjusting valve door between the downstream cavity and second one-way valve.
Further, the first Water flow adjusting valve door and the second Water flow adjusting valve door are needle-valve.
Further, be provided with first filter between the upstream cavity and the first Water flow adjusting valve door, upstream cavity is connected to pressure measuring chamber through first filter.
Further, be provided with second filter between the downstream cavity and the second Water flow adjusting valve door.
Further, downstream cavity links to each other with the downstream cavity end of electric three passes ball valve through second filter, or establishes the 3rd filter in addition between the downstream cavity end of downstream cavity and electric three passes ball valve.
Multi-functional control valve of water pump of the present invention is by once regulating permanent Yang Cheng pilot valve (setting value is a water pump rated head value), Water flow adjusting valve door (suitable flow value), and control electric three passes ball valve opens and closes and realizes all controlling function during work.
Working principle of the present invention is as follows:
(1) holds pressure operating mode (zero delivery startup water pump)
As shown in Figure 1, before the starting mode of pump, the atmosphere end c of electric three passes ball valve 15 and common port a conducting, following control chamber 3 logical atmosphere, pressure is zero, valve closes.(control the common port a and the downstream cavity end b conducting of electric three passes ball valve 15 simultaneously) behind the starting mode of pump, the pressure of upstream cavity 20 continues to increase.During lift value that upstream cavity 20 pressure no shows preset, the inlet A of permanent lift pilot valve 11 and the first outlet B conducting (long logical), the second outlet C closes, and valve closes, and reaches zero delivery and starts the water pump purpose.When the pressure of upstream cavity 20 reaches the lift value that presets, the second outlet C conducting of permanent lift pilot valve 11, shunt with inlet A, the first outlet B, thereby the pressure of control chamber 5 is descended, following control chamber 3 pressure increase, barrier film 4 moves up, and under the thrust of flap 18 bottoms, valve is slowly opened feedwater downstream simultaneously.
(2) Heng Yangcheng (constant current amount) operating mode
After water pump was opened, current entered upstream cavity 20, and the inlet A through permanent lift pilot valve 11 flows to the first outlet B to last control chamber 5 again, and splitter section to the second exports C control chamber 3 extremely down.
When the decline of downstream cavity 1 pressure, when flow increases.When upstream cavity 20 pressure are lower than the lift value that presets of permanent lift pilot valve 11, the pressure measuring chamber pressure of permanent lift pilot valve 11 descends, the pilot valve aperture reduces, thereby the second outlet C flow reduces, barrier film 4 moves down, flap 18 apertures are reduced, be increased to till the lift value that presets until upstream cavity 20 pressure.
When the rising of downstream cavity 1 pressure, when flow reduces.When upstream cavity 20 pressure are higher than the lift value that presets of permanent lift pilot valve 11, the pressure measuring chamber pressure of permanent lift pilot valve 11 raises, the pilot valve aperture increases, thereby the second outlet C flow increases, barrier film 4 moves up, flap 18 apertures are increased, reduce to till the lift value that presets until upstream cavity 20 pressure.
Like this under the aperture of permanent lift pilot valve is adjusted, under the acting in conjunction by last control chamber, following control chamber, make barrier film interlock flap constantly regulate aperture, to adapt to the continuous variation of downstream pressure (device lift), water pump is supplied water, to keep permanent lift (constant current amount) working state of water pump down at the lift of setting (design conditions).
(3) non-return operating mode
When water pump quits work, the atmosphere end c and the common port a conducting of control electric three passes ball valve 15, following control chamber 3 logical atmosphere are because upstream cavity 20 pressure are die-offed, the aperture of permanent lift pilot valve 11 is zero, the second outlet C ends, and barrier film 4 moves down rapidly, if downstream pressure is higher than upstream pressure, downstream cavity 1 continues upwards control chamber 5 water-fillings, under the acting in conjunction of gravity, spring force, flap 18 is closed, and has realized the non-return effect of valve simultaneously.By the aperture of metering pin valve 9, the Slow Close speed of may command valve.
(4) anti-water hammer operating mode
When water pump slows down or quits work, upstream cavity 20 pressure of this valve are die-offed, the aperture of permanent lift pilot valve 11 is zero gradually, the second outlet C flow gradually reduces, and ends then, if downstream pressure is higher than upstream pressure, downstream cavity 1 continues upwards control chamber 5 water-fillings, because the pressure of following control chamber 3 is suitable with last control chamber 5, but under the acting in conjunction of gravity, spring force, flap 18 can only be closed major part.Control the atmosphere end c and the common port a conducting of electric three passes ball valve 15 then, following control chamber 3 logical atmosphere, following control chamber 3 decompressions, flap 18 is just closed remaining part rapidly.By control electric three passes ball valve 15, can effectively prevent the generation of water hammer.
(5) emergency cut-off (remote control ends) operating mode
The situation of water pump, the upstream and downstream pressure reduction that needs zero delivery to close when some system very little (inefficacy of non-return operating mode), emergency cut-off water pump water outlet passage, can cross the atmosphere end c and the common port a conducting of control electric three passes ball valve 15, make down control chamber 3 logical atmosphere, following control chamber 3 decompressions, flap 18 is closed rapidly.Play the remote-controlled cut-off valve effect.
ZL200820301943 compares with utility model patent, and this model utility is " switch " type, and the present invention is the valve of " switch "+" adjusting " type.Because " switch " type only needs " way flow " just can (switch on and finish an action)." adjusting " type needs " bidirectional flow " (two-way fluid flows, and constantly changes the water flow in two " chambeies ", changing the displacement of diaphragm, thereby reaches the aperture of adjustment " flap ").It is unscientific that this model utility opens that valve finishes by the control time, because very difficult grasp of the time of wanting water pump to reach " rated power ", in advance and time expand all can impact effect, and the present invention controls with the way of measurement " pressure ", both accurate, again need not be electric etc. means auxiliary.The present invention can two sections throttle downs, and the effect of eliminating " water hammer " is very good.This model utility what is called " energy-conservation " is unscientific, if pure outlet valve, yes resistance the smaller the better (aperture maximum as far as possible), but whether water pump is energy-conservation, be to see whether it is operated in " efficient district ", and the adjustment of operating point, increase (regulating the pipeline resistance coefficient) that the valve resistance is finished exactly, and the advantage of the maximum of invention just is: automatic regulating valve door aperture (resistance), come the inlet pressure of constant valve, thereby constant water delivery side of pump pressure guarantees in efficient district's work---energy-conservation.
Compared with prior art, advantage of the present invention is:
(1) the present invention can once regulate and realize the various control function;
(2) the present invention can single body solves the ten big puzzlement difficult problems that industry now exists always when the water pump practical application;
(3) the present invention uses permanent lift pilot valve, makes valve mechanism simple, the control accuracy height;
(4) the present invention uses the electric three passes ball valve, avoids using a plurality of solenoid valves (one-way) and a plurality of unidirectional
The connection that valve could be realized makes valve mechanism simple, the reliability height;
(5) multi-functional control valve of water pump of the present invention has the cost performance height, has a extensive future.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of the present invention.
Fig. 2 is a kind of structural representation of permanent lift pilot valve.
Fig. 3 be among Fig. 2 N-N to cross-sectional schematic.
Shown in the figure: 1: downstream cavity; 2: valve body; 3 times control chambers; 4: barrier film; 5: go up control chamber; 6: valve gap; 7: filter; 8: filter; 9: needle-valve (the second water flow control valve); 10: one-way valve; 11: permanent lift pilot valve; 12: one-way valve; 13: filter; 14: needle-valve (the first water flow control valve); 15: the electric three passes ball valve; 16: the diaphragm clip pad; 17: valve rod; 18: flap; 19: valve seat; 20: upstream cavity; 21: regulate bolt; 22: tightening nut; 23: the spring body; 24: top board; 25: upper spring; 26: bottom plate; 27: diaphragm; 28: upper valve core; 29: upper valve body; 30:O type circle; 31: sealing gasket; 32: the upper valve core Sealing; 33: the upper valve core depression bar; 34: lower valve core; 35: the lower valve core Sealing; 36: following valve body; 37: lower spring; 38: following plug screw; 39 pressure measuring chambers.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in detail.
As shown in Figure 1, the present invention is a kind of multi-functional control valve of water pump by brand new, and it comprises downstream cavity 1, valve body 2, following control chamber 3, barrier film 4, goes up control chamber 5, valve gap 6, filter 7, filter 8, needle-valve 9, one-way valve 10, permanent lift pilot valve 11, one-way valve 12, filter 13, needle-valve 14, electric three passes ball valve 15, diaphragm clip pad 16, valve rod 17, flap 18, valve seat 19 and upstream cavity 20.Described valve body 2 is made up of downstream cavity 1, time control chamber 3, last control chamber 5 and upstream cavity 20 etc.Permanent lift pilot valve 11 is three-way control valves of four connection mouths, and three-way control valve D port (being connected to pressure measuring chamber) is connected to upstream cavity 20 by pipeline and filter 13; The D port connects needle-valve 14, one-way valve 12 successively to inlet A port; The first outlet B port connects control chamber 5 respectively and is connected one-way valve 10, needle-valve 9, filter 8 successively to downstream cavity 1; The second outlet C port connects downstream cavity 1.The common port a port of electric three passes ball valve 15 connects control chamber 3 down; Downstream cavity end b port is connected to downstream cavity 1 by filter 7; Atmosphere end c port connects atmosphere, i.e. evacuation port.
As Fig. 2, shown in Figure 3, a kind of permanent lift pilot valve comprises spring body 23, upper valve body 29 and following valve body 36; Pressure measuring chamber 39 is located in the upper valve body 29, inlet A, the first outlet B and second export B and be located at down valve body 36, and the top of pressure measuring chamber 39 is provided with diaphragm 27, bottom plate 26, upper spring 25, top board 24 successively and is used to regulate the adjusting bolt 21 of lift; The top of spring body 23 is provided with and regulates the screw that bolt 21 matches; Spring body 23 is placed in inside with top board 24, upper spring 25 and bottom plate 26 and is fixed on the upper valve body 29; The below of bottom plate 26 is provided with upper valve core 28, lower valve core 34 and lower spring 37 successively; Upper valve body 29 is fixedlyed connected with following valve body 36; The shunting ratio of the first outlet B and the second outlet C is subjected to upper valve core 28 controls.The outward edge of diaphragm 27 presses fixing by spring body 23 and upper valve body 29.Be with O type circle 30 on the upper valve core 28.Upper valve body 29 is provided with sealing gasket 31 with the joint of following valve body 36.The bottom of upper valve core 28 is provided with upper valve core Sealing 32.Be provided with upper valve core depression bar 33 between upper valve core 28 and the lower valve core 34.The bottom of lower valve core 34 is provided with lower valve core Sealing 35.Be provided with below the lower spring 37 and be fixed in the following plug screw 38 of valve body 36 down.Be provided with inlet A2 in the middle of the following plug screw 38.Regulate between bolt 21 and the spring body 23 and be provided with tightening nut 22.As shown in Figure 2, for the ease of being connected with each base part, be provided with inlet A1 and A2 on the following valve body 36, at valve inner, A1 communicates with A2, during use, can seal one of them inlet.
Permanent lift pilot valve regulates by adjusting that bolt 21 is predeterminable decide the lift value, and to be the downward thrust of upper spring 25 with the effect of water pressure of pressure measuring chamber 39 make progress in diaphragm 27 and lower spring 37 its working principle synthesizes thrusts and form transient equiliblium mutually.The upwards thrust that acts on diaphragm is constantly changed, thereby upper valve core depression bar 33, lower valve core 34 are constantly moved up and down, the current that order enters from enter the mouth A1 or A2 constantly change and divide first outlet, the second assignment of traffic ratio that exports of flowing to.
Claims (9)
1. a multi-functional control valve of water pump comprises valve body (2); Described valve body (2) is general low flow resistance, two control chamber hydraulic control valve, comprises upstream cavity (20), downstream cavity (1), following control chamber (3) and goes up control chamber (5); It is characterized in that also comprising permanent lift pilot valve (11) and electric three passes ball valve (15); Described permanent lift pilot valve (11) comprises pressure measuring chamber, inlet, first outlet and second outlet, the pressure control of the tested pressure of the shunting ratio chamber of first outlet and second outlet, pressure measuring chamber links to each other with upstream cavity (20), upstream cavity (20) links to each other with inlet through first one-way valve (12), the flow direction of first one-way valve (12) is that upstream cavity (20) flows to inlet, first outlet links to each other with last control chamber (5), and second outlet links to each other with downstream cavity (1); Downstream cavity (1) links to each other with last control chamber (5) through second one-way valve (10), and the flow direction of second one-way valve (10) is a control chamber (5) on downstream cavity (1) flow direction; Electric three passes ball valve (15) comprises common port, atmosphere end and downstream cavity end, and common port links to each other with following control chamber (3), and atmosphere end communicates with atmosphere, and the downstream cavity end links to each other with downstream cavity (1).
2. multi-functional control valve of water pump according to claim 1 is characterized in that: described permanent lift pilot valve (11) comprises spring body (23), upper valve body (29) and following valve body (36); Pressure measuring chamber (39) is located in the upper valve body (29); Valve body (36) all is located at down in inlet, first outlet and second outlet; The top of pressure measuring chamber (39) is provided with diaphragm (27), bottom plate (26), upper spring (25), top board (24) successively and regulates bolt (21); The top of spring body (23) is provided with and regulates the screw that bolt (21) matches; Spring body (23) is placed in inside with top board (24), upper spring (25) and bottom plate (26) and is fixed on the upper valve body (29); The below of bottom plate (26) is provided with upper valve core (28), lower valve core (34) and lower spring (37) successively; Upper valve body (29) is fixedlyed connected with following valve body (36); First outlet directly is subjected to upper valve core (8) control with the shunting ratio of second outlet, and the displacement of upper valve core (8) is subjected to the pressure control of pressure measuring chamber (39).
3. multi-functional control valve of water pump according to claim 1 and 2 is characterized in that: be provided with the first Water flow adjusting valve door (14) between upstream cavity (20) and first one-way valve (12).
4. multi-functional control valve of water pump according to claim 3 is characterized in that: be provided with the second Water flow adjusting valve door (9) between downstream cavity (1) and second one-way valve (10).
5. multi-functional control valve of water pump according to claim 4 is characterized in that: the first Water flow adjusting valve door (14) is needle-valve with the second Water flow adjusting valve door (9).
6. multi-functional control valve of water pump according to claim 4 is characterized in that: be provided with first filter (13) between the upstream cavity (20) and the first Water flow adjusting valve door (14), upstream cavity (20) is connected to pressure measuring chamber through first filter (13).
7. multi-functional control valve of water pump according to claim 6 is characterized in that: be provided with second filter (7) between the downstream cavity (1) and the second Water flow adjusting valve door (9).
8. multi-functional control valve of water pump according to claim 7 is characterized in that: downstream cavity (1) links to each other through the downstream cavity end of second filter (7) with electric three passes ball valve (15).
9. multi-functional control valve of water pump according to claim 7 is characterized in that: be provided with the 3rd filter (8) between the downstream cavity end of downstream cavity (1) and electric three passes ball valve (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101030415A CN101761491B (en) | 2010-01-26 | 2010-01-26 | Multi-functional control valve of water pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101030415A CN101761491B (en) | 2010-01-26 | 2010-01-26 | Multi-functional control valve of water pump |
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| Publication Number | Publication Date |
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| CN101761491A true CN101761491A (en) | 2010-06-30 |
| CN101761491B CN101761491B (en) | 2011-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010101030415A Active CN101761491B (en) | 2010-01-26 | 2010-01-26 | Multi-functional control valve of water pump |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889217A (en) * | 2012-09-29 | 2013-01-23 | 广州三业科技有限公司 | Integrated control valve of constant-head/check valves |
| CN103195965A (en) * | 2012-01-04 | 2013-07-10 | 西安德力工业公司宏大阀门厂 | Electric-hydraulic control valve for Internet of Things |
| CN104251337A (en) * | 2013-06-27 | 2014-12-31 | 王志敏 | Novel water hammer eliminating valve |
| CN104375519A (en) * | 2014-11-28 | 2015-02-25 | 成都英力拓信息技术有限公司 | Pneumatic steering device controlled by things internet |
| CN104740819A (en) * | 2013-12-25 | 2015-07-01 | 上海金盾消防安全科技有限公司 | Diaphragm type constant-pressure rain falling alarm valve |
| CN106382400A (en) * | 2015-07-28 | 2017-02-08 | 安徽红星阀门有限公司 | Adjustable water discharger |
-
2010
- 2010-01-26 CN CN2010101030415A patent/CN101761491B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103195965A (en) * | 2012-01-04 | 2013-07-10 | 西安德力工业公司宏大阀门厂 | Electric-hydraulic control valve for Internet of Things |
| CN102889217A (en) * | 2012-09-29 | 2013-01-23 | 广州三业科技有限公司 | Integrated control valve of constant-head/check valves |
| CN104251337A (en) * | 2013-06-27 | 2014-12-31 | 王志敏 | Novel water hammer eliminating valve |
| CN104740819A (en) * | 2013-12-25 | 2015-07-01 | 上海金盾消防安全科技有限公司 | Diaphragm type constant-pressure rain falling alarm valve |
| CN104375519A (en) * | 2014-11-28 | 2015-02-25 | 成都英力拓信息技术有限公司 | Pneumatic steering device controlled by things internet |
| CN106382400A (en) * | 2015-07-28 | 2017-02-08 | 安徽红星阀门有限公司 | Adjustable water discharger |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101761491B (en) | 2011-10-05 |
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Inventor after: Zheng Quan Inventor after: Zheng Jianwei Inventor before: Zheng Quan |
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