CN103921839B - Flow regulating valve, hydraulic power steering system and vehicle - Google Patents
Flow regulating valve, hydraulic power steering system and vehicle Download PDFInfo
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- CN103921839B CN103921839B CN201410181668.0A CN201410181668A CN103921839B CN 103921839 B CN103921839 B CN 103921839B CN 201410181668 A CN201410181668 A CN 201410181668A CN 103921839 B CN103921839 B CN 103921839B
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- valve rod
- flow regulating
- oil
- regulating valve
- container cavity
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Abstract
The invention discloses a kind of flow regulating valve, comprise the hydrostatic steering system of this flow regulating valve and comprise the vehicle of this hydrostatic steering system.Described flow regulating valve comprises oil inlet (11), oil outlet (12) and the normal open oil duct (13) being communicated with oil inlet and oil outlet, wherein, container cavity (15) is also formed in described flow regulating valve, container cavity is formed with towards one end of described oil inlet the valve body open hole (16) be communicated with oil inlet, valve rod (21) can be provided with slidably in container cavity, and one end towards oil outlet of container cavity is provided with stop part (24), one end of valve rod is provided with sealing fit portion (23), elastic component (22) is provided with between valve rod and stop part, wherein at the sealing station of valve rod, sealing fit portion is closed valve open hole under the effect of elastic component, in the open position of valve rod, oil inlet is communicated with oil outlet via valve body open hole, by above-mentioned setting, flow regulating valve provided by the invention can reduce the oil pressure difference at its two ends effectively and in time.
Description
Technical field
The present invention relates to vehicular field, particularly, relate to a kind of flow regulating valve, comprise the hydraulic power steering system of this flow regulating valve and comprise the vehicle of this hydraulic power steering system.
Background technology
Usually, most of vehicle adopts hydraulic power steering system to control the travel direction of automobile according to the wish of chaufeur.In hydraulic power steering system, due to layout and the trend of oil pipe pipeline, make, in vehicle travels, in oil pipe, to there is larger pressure fluctuation.In addition, when low vehicle speeds, because the oil pump capacity of power steerig pump is comparatively large, the fluid therefore in oil pipe produces larger impact to oil pipe, thus causes the fluctuation of oil pressure in oil pipe.In prior art, being typically employed in increases flow regulating valve mode in the oil return line flowing to oil sump tank reduces the pressure fluctuation in oil pipe.Flow regulating valve of the prior art is the normal open oil duct of set aperture, when frequently spin fast to time turn to liquid (machine oil from power steerig pump) flow velocity to increase sharply, because existing flow regulating valve is set aperture, flow regulating valve both sides can produce pressure reduction, and pressure sharply increases, cause the junction of oil pipe and flow regulating valve to exist and throw off risk; In addition, because pressure sharply changes, the oil temperature in steering swivel system constantly rises, and exacerbates the aging of steering swivel system oil pipe.In addition, because flow regulating valve both sides pressure reduction constantly increases, cause steering swivel system underfed, occur the phenomenon of hard steering.
Therefore, a kind of flow regulating valve that can improve or eliminate the above-mentioned problems in the prior art is needed.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of flow regulating valve, and this flow regulating valve can reduce the oil pressure difference at its two ends effectively and in time.
In order to solve the problems of the technologies described above, the invention provides a kind of flow regulating valve, this flow regulating valve comprises oil inlet, oil outlet and the normal open oil duct being communicated with described oil inlet and described oil outlet, wherein, also container cavity is formed with in described flow regulating valve, one end towards described oil inlet of described container cavity is formed with the valve body open hole be communicated with described oil inlet, valve rod can be provided with slidably in described container cavity, and one end towards described oil outlet of this container cavity is provided with stop part, one end of described valve rod is provided with sealing fit portion, elastic component is provided with between described valve rod and described stop part, wherein at the sealing station of described valve rod, described sealing fit portion closes described valve body open hole under the effect of described elastic component, in the open position of described valve rod, described oil inlet is communicated with described oil outlet via described valve body open hole.
Preferably, this flow regulating valve also comprises housing, described container cavity is formed in this housing, and be also formed with compensation oil duct in described housing, wherein at the sealing station of described valve rod, described valve rod makes described sealing fit portion close described valve body open hole under the elastic force effect of described elastic component, in the open position of described valve rod, described valve rod can make the sealing fit portion of described valve rod depart from described valve body open hole by the oil pressure effect of described oil inlet, thus make described oil inlet via described valve body open hole, container cavity and compensation oil duct and being communicated with described oil outlet.
Preferably, the chamber wall of described container cavity is provided with the interface channel for being communicated with described compensation oil duct and described container cavity.
Preferably, described valve rod is formed with the ring week flange part with described container cavity leak tightness bearing fit, the diameter of all flange parts of this ring is greater than the diameter of the base portion of described valve rod, and described elastic component resilient mounting is between all flange parts of described ring and described stop part.
Preferably, at the described sealing station of described valve rod, all flange parts of described ring close described interface channel, and in the open position of described valve rod, described interface channel is communicated with the interface channel of described compensation oil duct and described container cavity.
Preferably, described stop part is formed with outside thread to be arranged on one end towards described oil outlet of described container cavity by screw thread fit, this stop part is formed with valve rod mating holes, the other end of described valve rod extend in described valve rod mating holes and can slide in this valve rod mating holes.
Preferably, the other end of described valve rod is formed with outside thread, the other end of this valve rod reach described valve rod mating holes outside and with stem nut screw thread fit, described stem nut is resisted against on described stop part.
Preferably, described elastic component is spring.
Preferably, the axis of described container cavity and the dead in line of described housing, and described normal open oil duct and described compensation oil duct in described housing around the circumferential directions of described container cavity.
On the basis of technique scheme, the present invention also provides a kind of hydraulic power steering system, this hydraulic power steering system comprises oil inlet and oil outlet pipe, wherein, described hydraulic power steering system also comprises flow regulating valve provided by the invention, described oil inlet is connected to the oil inlet of described flow regulating valve, and described oil outlet pipe is connected to the oil outlet of described flow regulating valve.
In addition, the present invention also provides a kind of vehicle, and wherein, this vehicle comprises above-mentioned hydraulic power steering system provided by the invention.
Pass through technique scheme, the oil pressure difference at flow regulating valve two ends can be reduced according to flow regulating valve provided by the invention, when the oil pressure difference at flow regulating valve two ends increases to a certain degree, under the effect of the oil pressure of oil inlet end, the elastic force that valve rod overcomes elastic component moves to open position from sealing station, thus make fluid from oil inlet by compensating oil duct and then flow out flow regulating valve by oil outlet, increase the fluid flow by flow regulating valve in the unit time, thus reduce the oil pressure difference at flow regulating valve two ends.Hydrostatic steering system according to the present invention comprises above-mentioned flow regulating valve, therefore, when hydrostatic steering system works, by the pressure fluctuation of the fluid in the oil pipe in flow regulating valve reduction system, simultaneously because flow regulating valve can balance the oil pressure difference of its both sides timely, therefore, it is possible to the risk that the junction effectively reducing oil pipe and flow regulating valve is thrown off, and the oil liquid temperature that can keep in oil pipe, alleviate the relevant catabiosis in steering swivel system.Comprise above-mentioned hydrostatic steering system according to vehicle provided by the invention, therefore, this vehicle has above-mentioned advantage equally.
Other features and advantages of the present invention are described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification sheets, is used from explanation the present invention, but is not construed as limiting the invention with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 is the front view of throttling valve housing according to the embodiment of the present invention;
Fig. 2 is the cutaway view along A-A line cutting in Fig. 1;
Fig. 3 is the cutaway view along C-C line cutting in Fig. 1;
Fig. 4 is the cutaway view along D-D line cutting in Fig. 1;
Fig. 5 is the left view of the housing shown in Fig. 1;
Fig. 6 is the right elevation of the housing shown in Fig. 1;
Fig. 7 is the birds-eye view of throttling valve housing according to the embodiment of the present invention;
Fig. 8 is the cutaway view along B-B line cutting in Fig. 7;
Fig. 9 is the front view of the part according to hydraulic power steering system of the present invention, comprising flow regulating valve according to the present invention, oil inlet and oil outlet pipe;
Figure 10 is the cutaway view along E-E line cutting in Fig. 9;
Figure 11 is the birds-eye view assembled according to flow regulating valve of the present invention and oil inlet and oil outlet pipe;
Figure 12 is the cutaway view along F-F line cutting in Figure 11;
Figure 13 is the decomposition view of the part according to hydraulic power steering system of the present invention;
Figure 14 is the decomposing schematic representation of the part except housing according to flow regulating valve of the present invention.
Description of reference numerals
1 housing; 11 oil inlets; 12 oil outlets; 13 normal open oil ducts; 14 compensate oil duct; 15 container cavities; 16 valve body open holes; 17 interface channels; 18 auxiliary holes; 19 blocking pins; 2 valve rod assemblies; 21 valve rods; 22 elastic components; 23 sealing fit portion; 24 stop parts; 25 stem nuts; The all flange parts of 26 rings; 3 oil inlets; 4 oil outlet pipes; 5 first seal rings; 6 second seal rings.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
In the present invention, when not doing contrary explanation, the noun of locality of use such as " upper and lower, left and right, inside and outside " refers to the upper and lower, left and right, inside and outside of the profile relative to each parts itself, but the above-mentioned noun of locality is not limited to the present invention.
According to an aspect of the present invention, a kind of flow regulating valve is provided, a kind of flow regulating valve, this flow regulating valve comprises oil inlet 11, oil outlet 12 and the normal open oil duct 13 being communicated with oil inlet 11 and oil outlet 12, wherein, container cavity 15 is also formed in flow regulating valve, one end towards oil inlet 11 of container cavity 15 is formed with the valve body open hole 16 be communicated with oil inlet 11, valve rod 21 can be provided with slidably in container cavity 15, and one end towards oil outlet 12 of container cavity 15 is provided with stop part 24, one end of valve rod 21 is provided with sealing fit portion 23, elastic component 22 is provided with between valve rod 21 and stop part 24, wherein at the sealing station of valve rod 21, sealing fit portion 23 is closed valve open hole 16 under the effect of elastic component 22, in the open position of valve rod 21, oil inlet 11 is communicated with oil outlet 12 via valve body open hole 16.
Pass through technique scheme, the concrete principle of work of flow regulating valve provided according to an aspect of the present invention is: when the oil pressure of oil inlet 11 end reaches certain value (being assumed to F), the elastic force that elastic component 22 provides is less than F, thus be not enough to the sealing fit portion 23 closed valve open hole 16 making valve rod 21, therefore, in this case, valve rod 21 is in open position, valve body open hole 16 is opened, fluid from oil inlet 11 enters container cavity 15 by valve body open hole 16, and then flows out flow regulating valve by oil outlet 12; When the oil pressure of oil inlet 11 end does not reach F value, valve rod 21 makes the sealing fit portion 23 closed valve open hole 16 of valve rod 21 under the elastic force effect of elastic component 22, therefore, in this case, valve rod 21 is in sealing station, and the fluid from oil inlet 11 end only flows through normal open oil duct 13 and then flows out flow regulating valve by oil outlet 12.Therefore, flow regulating valve provided by the invention can reduce the difference of the oil pressure at oil inlet 11 place and the oil pressure at oil outlet 12 place.
The specific embodiment of the present invention is described in detail below in conjunction with Fig. 1 to Figure 14.For convenience of description with shown in the drawings, can know that flow divider valve comprises housing 1 and valve rod assembly 2 two parts by following description, wherein, valve rod assembly 2 comprises valve rod 21, elastic component 22, sealing fit portion 23, stop part, stem nut 25 and ring week flange part 26.
According in the flow regulating valve of the preferred embodiment of the present invention, as shown in Figure 8, flow regulating valve also comprises housing 1, described container cavity 15 is formed in this housing 1, and be also formed in described housing 1 and compensate oil duct 14, wherein at the sealing station of described valve rod 21, described valve rod 21 makes described sealing fit portion 23 close described valve body open hole 16 under the elastic force effect of described elastic component 22, in the open position of described valve rod 21, described valve rod 21 can make the sealing fit portion 23 of described valve rod 21 depart from described valve body open hole 16 by the oil pressure effect of described oil inlet 11, thus make described oil inlet 11 via described valve body open hole 16, container cavity 15 and compensation oil duct 14 and being communicated with described oil outlet 12.
The chamber wall of container cavity 15 can be provided with for being communicated with the interface channel 17 compensating oil duct 14 and container cavity 15.In the technique forming interface channel 17, the outer peripheral face of housing 1 is formed with corresponding auxiliary hole 18, this auxiliary hole 18 is closed by blocking pin envelope 19.
Preferably, as shown in Figure 10, Figure 12 and Figure 14, valve rod 21 can be formed with the ring week flange part 26 with container cavity 15 leak tightness bearing fit, the diameter of all flange parts 26 of this ring is greater than the diameter of the base portion of valve rod 21, and elastic component 22 resilient mounting is between all flange parts 26 of ring and stop part 24.
In the preferred implementation of flow regulating valve according to the present invention, as shown in Figure 10, at the described sealing station of valve rod 21, all flange parts 26 of ring close interface channel 17, in the open position of valve rod 21, interface channel 17 is communicated with the interface channel 17 compensating oil duct 14 and container cavity 15.Therefore, those skilled in the art it is understood that, when valve rod 21 slides into open position from sealing station in container cavity 15, ring week, flange part 26 opened interface channel 17 gradually along with the movement of valve rod 21, thus the degree opened along with interface channel 17 of the flow making to flow through interface channel 17 by container cavity 15 and enter the fluid compensating oil duct 14 and changing.Therefore, when the oil pressure of oil inlet 11 end is greater than F, this set can regulate the difference of the oil pressure of oil inlet 11 end and the oil pressure of oil outlet 12 end further.
In a kind of embodiment of flow regulating valve according to the present invention, stop part 24 can be formed with outside thread to be arranged on one end towards oil outlet 12 of container cavity 15 by screw thread fit, and this stop part 24 can be formed with valve rod mating holes, and the other end of valve rod 21 extend in valve rod mating holes and can slide in this valve rod mating holes.
The other end of valve rod 21 can be formed with outside thread, the other end of this valve rod 21 reach valve rod mating holes outside and with stem nut 25 screw thread fit, stem nut is resisted against on stop part 24, by this set, can be regulated by the precession degree of regulating valve stem nut 25 and make the minimum force of elastic component 22 deformation (this minimum force equals F).
In the preferred implementation of flow regulating valve according to the present invention, elastic component 22 can be spring.This spring can have and multiplely arranges form, and preferably, as shown in Figure 10 and Figure 12, spring can be set on valve rod 21, and one end bias ring week flange part 26 of spring, other end bias voltage stop part 24.But the present invention is not limited thereto, when valve rod 21 is not be provided with ring week flange part 26 time, spring can also be set to the sealing fit portion 23 of its one end bias voltage as shown in Figure 10 and 12, other end bias voltage stop part 24.In addition, in the another kind of embodiment of flow regulating valve according to the present invention, elastic component 22 can the end towards stop part 24 of one end bias voltage valve rod 21, other end bias voltage stop part 24.
In order to optimize normal open oil duct 11 in housing 1, compensate the space layout of oil duct 14 and container cavity 15 and be convenient to produce, preferably, the axis of container cavity 15 and the dead in line of housing 1, and normal open oil duct 13 and compensation oil duct 14 are within the case 1 around the circumferential directions of container cavity 15, normal open oil duct 13 can be set to multiple, compensates oil duct 14 and also can be set to multiple.In the preferred implementation of flow regulating valve according to the present invention, as shown in Figures 2 to 6, housing 1 comprises two normal open oil ducts 13 and two compensation oil ducts 14, and these two normal open oil ducts 13 and two arrangements compensating oil ducts 14 are equidistantly arrange around the circumferencial direction of container cavity 15.
According to a further aspect in the invention, a kind of hydraulic power steering system is provided, this hydraulic power steering system comprises oil inlet 3 and oil outlet pipe 4, wherein, described hydraulic power steering system also comprises flow regulating valve provided by the invention, oil inlet 3 is connected to the oil inlet 11 of described flow regulating valve, and described oil outlet pipe 4 is connected to the oil outlet 12 of described flow regulating valve.Particularly, described flow regulating valve is arranged on and is connected in the oil return line of oil sump tank, carried out the sealing of oil-feed place by the first seal ring 5 being arranged on the junction of the oil inlet 11 of oil inlet 3 and flow regulating valve, carried out the sealing at fuel-displaced place by the second seal ring 6 being arranged on the junction of the oil outlet 12 of oil outlet pipe 4 and flow regulating valve.
In addition, the present invention also provides a kind of vehicle, and wherein, this vehicle comprises above-mentioned hydraulic power steering system.
As mentioned above, by flow regulating valve provided by the invention, the oil pressure difference at flow regulating valve two ends can be reduced, in the description of the detailed description of the invention of above-mentioned flow regulating valve, describe in detail the principle of work that flow regulating valve reduces the oil pressure difference at flow regulating valve two ends, do not repeat them here.Hydraulic power system provided by the invention comprises flow regulating valve provided by the invention, therefore, the hydraulic power system that inventing provides can reduce the pressure fluctuation in hydraulic oil pipe by flow regulating valve, the oil pressure reducing the oil inlet end of flow regulating valve and oil outlet end is poor, the junction of oil pipe and flow regulating valve is avoided to there is the risk of throwing off, the oil mass of the steering swivel system ensured, avoids the phenomenon of hard steering.In addition, due to the effect of flow regulating valve, the oil pressure in the hydraulic oil pipe in steering swivel system no longer sharply changes, and the fluid therefore in hydraulic oil pipe can keep lower temperature, thus avoids the aging phenomenon of oil pipe.Because vehicle provided by the invention comprises above-mentioned hydraulic power system, therefore, this vehicle has above-mentioned advantage equally.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out combination in any between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (9)
1. a flow regulating valve, this flow regulating valve comprises oil inlet (11), oil outlet (12) and the normal open oil duct (13) being communicated with described oil inlet (11) and described oil outlet (12), it is characterized in that, container cavity (15) is also formed in described flow regulating valve, one end towards described oil inlet (11) of described container cavity (15) is formed with the valve body open hole (16) be communicated with described oil inlet (11), valve rod (21) can be provided with slidably in described container cavity (15), and one end towards described oil outlet (12) of this container cavity (15) is provided with stop part (24), one end of described valve rod (21) is provided with sealing fit portion (23), elastic component (22) is provided with between described valve rod (21) and described stop part (24), wherein at the sealing station of described valve rod (21), described sealing fit portion (23) closes described valve body open hole (16) under the effect of described elastic component (22), in the open position of described valve rod (21), described oil inlet (11) is communicated with described oil outlet (12) via described valve body open hole (16),
Described flow regulating valve also comprises housing (1), described container cavity (15) is formed in this housing (1), and be also formed in described housing (1) and compensate oil duct (14), wherein at the sealing station of described valve rod (21), described valve rod (21) makes described sealing fit portion (23) close described valve body open hole (16) under the elastic force effect of described elastic component (22), in the open position of described valve rod (21), described valve rod (21) can make the sealing fit portion of described valve rod (21) (23) depart from described valve body open hole (16) by the oil pressure effect of described oil inlet (11), thus make described oil inlet (11) via described valve body open hole (16), container cavity (15) and compensation oil duct (14) and be communicated with described oil outlet (12).
2. flow regulating valve according to claim 1, is characterized in that, the chamber wall of described container cavity (15) is provided with the interface channel (17) for being communicated with described compensation oil duct (14) and described container cavity (15).
3. flow regulating valve according to claim 2, it is characterized in that, described valve rod (21) is formed with ring week flange part (26) with described container cavity (15) leak tightness bearing fit, the diameter of this ring week flange part (26) is greater than the diameter of the base portion of described valve rod (21), and described elastic component (22) resilient mounting is between described ring week flange part (26) and described stop part (24).
4. flow regulating valve according to claim 3, it is characterized in that, at the described sealing station of described valve rod (21), described ring week flange part (26) closes described interface channel (17), in the open position of described valve rod (21), described interface channel (17) is communicated with described compensation oil duct (14) and described container cavity (15).
5. flow regulating valve according to claim 1, it is characterized in that, described stop part (24) is formed with outside thread to be arranged on one end towards described oil outlet (12) of described container cavity (15) by screw thread fit, (24) are formed with valve rod mating holes to this stop part, and the other end of described valve rod (21) extend in described valve rod mating holes and can slide in this valve rod mating holes.
6. flow regulating valve according to claim 5, it is characterized in that, the other end of described valve rod (21) is formed with outside thread, the other end of this valve rod (21) reach described valve rod mating holes outside and with stem nut (25) screw thread fit, described stem nut is resisted against on described stop part (24).
7. according to the flow regulating valve in claim 1-6 described in any one, it is characterized in that, the axis of described container cavity (15) and the dead in line of described housing (1), and described normal open oil duct (13) and described compensation oil duct (14) in described housing (1) around the circumferential directions of described container cavity (15).
8. a hydraulic power steering system, this hydraulic power steering system comprises oil inlet (3) and oil outlet pipe (4), it is characterized in that, described hydraulic power steering system also comprises according to the flow regulating valve in claim 1-7 described in any one, described oil inlet (3) is connected to the oil inlet (11) of described flow regulating valve, and described oil outlet pipe (4) is connected to the oil outlet (12) of described flow regulating valve.
9. a vehicle, is characterized in that, this vehicle comprises hydraulic power steering system according to claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410181668.0A CN103921839B (en) | 2014-04-30 | 2014-04-30 | Flow regulating valve, hydraulic power steering system and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410181668.0A CN103921839B (en) | 2014-04-30 | 2014-04-30 | Flow regulating valve, hydraulic power steering system and vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103921839A CN103921839A (en) | 2014-07-16 |
| CN103921839B true CN103921839B (en) | 2016-04-06 |
Family
ID=51140299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410181668.0A Expired - Fee Related CN103921839B (en) | 2014-04-30 | 2014-04-30 | Flow regulating valve, hydraulic power steering system and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103921839B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3933843B2 (en) * | 2000-04-27 | 2007-06-20 | ユニシア ジェーケーシー ステアリングシステム株式会社 | Variable displacement pump |
| JP2002127925A (en) * | 2000-10-23 | 2002-05-09 | Unisia Jkc Steering System Co Ltd | Steering damper |
| CN2835678Y (en) * | 2005-10-15 | 2006-11-08 | 浙江恒隆万安泵业有限公司 | Steering pump flow control device |
| JP5411618B2 (en) * | 2009-08-06 | 2014-02-12 | カヤバ工業株式会社 | Solenoid proportional control valve |
| CN201769878U (en) * | 2010-07-21 | 2011-03-23 | 浙江恒隆万安泵业有限公司 | Steering oil pump flow control structure |
| CN102032375B (en) * | 2010-12-01 | 2014-07-09 | 瑞立集团瑞安汽车零部件有限公司 | Flow control valve of steering pump |
| CN102537454B (en) * | 2012-01-04 | 2013-06-05 | 浙江盾安机械有限公司 | Differential pressure throttle valve |
-
2014
- 2014-04-30 CN CN201410181668.0A patent/CN103921839B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN103921839A (en) | 2014-07-16 |
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