CN202228452U - Ratio pressure flow composite control valve - Google Patents
Ratio pressure flow composite control valve Download PDFInfo
- Publication number
- CN202228452U CN202228452U CN2011203544038U CN201120354403U CN202228452U CN 202228452 U CN202228452 U CN 202228452U CN 2011203544038 U CN2011203544038 U CN 2011203544038U CN 201120354403 U CN201120354403 U CN 201120354403U CN 202228452 U CN202228452 U CN 202228452U
- Authority
- CN
- China
- Prior art keywords
- valve
- chamber
- spring
- ante
- safety
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Magnetically Actuated Valves (AREA)
Abstract
A ratio pressure flow composite control valve is mainly used for solving the problems of complex structure, poor flowing capacity and inconvenience in maintenance of an existing electro-hydraulic ratio pressure flow composite control valve, is characterized in that a fixed differential overflowing assembly (3) has an inserted type logic valve structure, and is mainly composed of a valve sleeve (31), a valve core (32), a spring (33), a valve seat (34) and a spring seat (35). A spring cavity (37) of the fixed differential overflow valve is sequentially communicated with a front cavity (51) of a safety valve and a front cavity (41) of a pilot valve through a first damp (R1). The ratio pressure flow composite control valve adopts an inserted type fixed differential overflow valve to replace a traditional non-inserted type fixed differential overflow valve, simultaneously optimizes the structure of a throttle valve core, improves throttling characteristics and steady state pressure and control capacity of flow, and has the advantages of being simple in structure, good in flowing capacity and convenient to maintain.
Description
Technical field
The utility model relates to a kind of control valve that the pressure and the flow of system are carried out compound control, is specifically related to a kind of ratio pressure flow compound control valve.
Background technique
In hydraulic system, some hydraulic system is very high to the requirement of pressure and flow, such as the injection machine hydraulic system.For solving the problem that system pressure and flow are controlled simultaneously, 20 th century later Japan have at first developed the compound control valve that has pressure and flow regulating function simultaneously.This valve is constant through the pressure reduction that keeps the throttle orifice two ends, constant flow through throttle orifice, and the passing ratio relief valve is regulated charge oil pressure.This valve is widely used in the metering pump control system, has Flow-rate adjustment and pressure control effect preferably.Proportional flow piezometric force control valve has the dual functions of control flow rate and pressure, so also claim two Proportional valves.The ratio pressure Flow valve is actually by a pilot proportional relief valve and a proportional throttle valve and combines; Because it can also possess the structure function that induced pressure feedback and pressure are followed the trail of in the controlled hydraulic system flow, flow is regulated control by the flow proportional electromagnet, and pressure is to regulate control by the pressure proportional electromagnet.
The key component of traditional electric-hydraulic proportion compound control valve of pressure flowrate is the constant difference overflow valve assembly, and the constant difference overflow valve assembly is the multistage concentric structure of stepped shaft.There is following defective in this conventional construction: 1. the stepped shaft sliding valve structure has multistage concentric requirement, and technological requirement is higher, complex process; 2. the effective area of passage of stepped shaft sliding valve structure is little, and flow resistance is big, through-current capability is poor; 3. this multistage concentric structure also brings difficulty to maintenance.
The model utility content
In order to overcome existing electric-hydraulic proportion compound control valve of pressure flowrate complex structure, through-current capability difference and to safeguard inconvenient deficiency; The utility model provides a kind of ratio pressure flow compound control valve; This ratio pressure flow compound control valve adopts the plug-in type constant difference overflow valve to replace traditional non-plug-in type constant difference overflow valve; Optimized the structure of throttling valve core simultaneously; Improved restriction characteristic, improved the control ability of steady state pressure and flow, had simple in structure, through-current capability and reach advantage easy to maintenance well.
The technological scheme of the utility model is: a kind of ratio pressure flow compound control valve comprises two Proportional valve pieces, orifice union, fixed poor overflow assembly, pilot valve and safety valve; Orifice union forms throttle valve and the constant difference overflow valve that links to each other with fixed shared pair of Proportional valve piece of poor overflow assembly; Pilot valve and safety valve are installed in the homonymy of two Proportional valve pieces; Pilot valve is provided with the ante-chamber of pilot valve and the spring chamber of pilot valve, and safety valve is provided with the ante-chamber of safety valve and the spring chamber of safety valve, and the ante-chamber of pilot valve communicates with the ante-chamber of safety valve; The spring chamber of pilot valve communicates with the spring chamber of safety valve; Described fixed poor overflow assembly is a plug-in type logical valve structure, mainly is made up of valve pocket, spool, spring, valve seat and spring seat, and valve seat and valve pocket are an one and an end that is arranged on valve pocket; Spool, spring and spring seat are contained in the valve pocket successively; Valve pocket inserts in two Proportional valve pieces and valve seat communicates with oil inlet P, and the sidewall of valve pocket is provided with through hole, and described through hole communicates with the interior oil return inlet T of two Proportional valve pieces; The spring chamber of constant difference overflow valve communicates with the ante-chamber of safety valve, the ante-chamber of pilot valve through the first damping R1 successively.
Described orifice union mainly is made up of throttling valve core, Returnning spring and end cap; Throttling valve core links to each other with the throttling electromagnet through controlling rod; Between throttling valve core and the two Proportional valve piece oil suction chamber arranged, go out the spring chamber of oil pocket and throttle valve; The oil suction chamber of throttle valve communicates with oil inlet P; The oil pocket connection actuator port A that goes out of throttle valve communicates with the ante-chamber of safety valve, the ante-chamber of pilot valve through the second damping R2 simultaneously successively, and the spring chamber of throttle valve communicates with the spring chamber of safety valve, the spring chamber of pilot valve successively, and end cap is provided with the control return opening Y that communicates with the spring chamber of throttle valve.
Restriction portion on the described throttling valve core is the little smooth curved surface solid of rotation of the big end of an end, and the sidewall of the restriction portion on the throttling valve core cross section that evenly distributes is the notch of " U " type.
Described notch is divided into big notch and little notch by width, and big notch and little notch are spaced apart.
Described pilot valve mainly is made up of guide's valve body, guide's valve seat, pilot valve core assembly and guide's electromagnet, and the pilot valve core assembly links to each other with iron core in the first conducting magnetic iron; Safety valve mainly is made up of Safety valve body, emergency valve seat and safety valve core assembly, and the safety valve core assembly links to each other with adjusting screw rod; Spring seat on the fixed poor overflow assembly is fixed on the Safety valve body.
Described Safety valve body is provided with first passage, second channel, third channel, four-way and five-way road; First passage is communicated with the ante-chamber of safety valve and the ante-chamber of pilot valve; Second channel is communicated with the spring chamber of safety valve and the spring chamber of pilot valve; Third channel be communicated with safety valve ante-chamber and throttle valve go out oil pocket, four-way is communicated with the ante-chamber of safety valve and the spring chamber of constant difference overflow valve, the spring chamber of five-way road connection safety valve and the spring chamber of throttle valve.
The described first damping R1 is installed in the four-way, and the second damping R2 is installed in the third channel.
The utlity model has following beneficial effect: owing to take such scheme, fixed poor overflow assembly adopts plug-in type logical valve structure, simplifies the structure, and has improved the control ability of steady state pressure and flow, and through-current capability is good, and is easy to maintenance.
Description of drawings
Accompanying drawing 1 is the structural representation of the utility model.
Accompanying drawing 2 is C-C structure sectional views among Fig. 1.
Accompanying drawing 3 is D-D structure sectional views among Fig. 1.
Accompanying drawing 4 is structure sectional views of throttling valve core 21 among Fig. 1.
Accompanying drawing 5 is E-E structure sectional views among Fig. 4.
Accompanying drawing 6 is hydraulic schematic diagrams of the utility model.
The two Proportional valve pieces of 1-among the figure, 2-orifice union, 21-throttling valve core, 211-restriction portion, 212-notch, 22-Returnning spring, 23-end cap; The 24-controlling rod, 25-throttling electromagnet, the 26-oil suction chamber, 27-goes out oil pocket, the spring chamber of 28-throttle valve, the fixed poor overflow assembly of 3-, 31-valve pocket; The 32-spool, 33-spring, 34-valve seat, 35-spring seat, 36-through hole, the spring chamber of 37-constant difference overflow valve, 4-pilot valve; The ante-chamber of 41-pilot valve, the spring chamber of 42-pilot valve, 43-guide's valve body, 44-guide's valve seat, 45-pilot valve core assembly, 46-elder generation conducting magnetic iron; The 5-safety valve, the ante-chamber of 51-safety valve, the spring chamber of 52-safety valve, 53-Safety valve body, 531-first passage, 532-second channel; The 533-third channel, 534-four-way, 535-five-way road, 54-emergency valve seat, 55-safety valve core assembly, 56-adjusting screw rod; The P-filler opening, the A-actuator port, the T-return opening, Y-controls return opening, R1-first damping, R2-second damping.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further:
Combine Fig. 2-shown in Figure 6 by Fig. 1; A kind of ratio pressure flow compound control valve comprises two Proportional valve pieces 1, orifice union 2, fixed poor overflow assembly 3, pilot valve 4 and safety valve 5; Orifice union 2 forms throttle valve and the constant difference overflow valve that links to each other with fixed 3 shared pairs of Proportional valve pieces of poor overflow assembly 1, and pilot valve 4 and safety valve 5 are installed in the homonymy of two Proportional valve pieces 1, and pilot valve 4 is provided with the ante-chamber 41 of pilot valve and the spring chamber 42 of pilot valve; Safety valve 5 is provided with the ante-chamber 51 of safety valve and the spring chamber 52 of safety valve; The ante-chamber 41 of pilot valve communicates with the ante-chamber 51 of safety valve, and the spring chamber 42 of pilot valve communicates with the spring chamber 52 of safety valve, and described fixed poor overflow assembly 3 is a plug-in type logical valve structure; Mainly form by valve pocket 31, spool 32, spring 33, valve seat 34 and spring seat 35; Valve seat 34 is an one and an end that is arranged on valve pocket 31 with valve pocket 31, and spool 32, spring 33 and spring seat 35 are contained in the valve pocket 31 successively, and valve pocket 31 inserts in two Proportional valve pieces 1 and valve seat 34 communicates with oil inlet P; The sidewall of valve pocket 31 is provided with through hole 36, and described through hole 36 communicates with two Proportional valve pieces 1 interior oil return inlet T; The spring chamber 37 of constant difference overflow valve communicates with the ante-chamber 51 of safety valve, the ante-chamber 41 of pilot valve through the first damping R1 successively.Because fixed poor overflow assembly 3 adopts plug-in type logical valve structure, compares with the concentric sliding core assembly in the background technique, simplifies the structure, and has improved the control ability of steady state pressure and flow, has increased area of passage, through-current capability is good.In addition, installing/dismounting is all very convenient, is convenient to safeguard.
Combine Fig. 3, shown in Figure 6 by Fig. 1; Described orifice union 2 mainly is made up of throttling valve core 21, Returnning spring 22 and end cap 23; Throttling valve core 21 links to each other with throttling electromagnet 25 through controlling rod 24; Between throttling valve core 21 and the two Proportional valve piece 1 oil suction chamber 26 arranged, go out the spring chamber 28 of oil pocket 27 and throttle valve; The oil suction chamber 26 of throttle valve communicates with oil inlet P; The oil pocket 27 connection actuator port A that go out of throttle valve communicate with the ante-chamber 51 of safety valve, the ante-chamber 41 of pilot valve through the second damping R2 simultaneously successively, and the spring chamber 28 of throttle valve communicates with the spring chamber 52 of safety valve, the spring chamber 42 of pilot valve successively, and end cap 23 is provided with the control return opening Y that communicates with the spring chamber 28 of throttle valve.Through regulating the input current of throttling electromagnet 25, realize the aperture control of throttling valve core 21, its aperture and input current value are proportional.
Combine Fig. 4, shown in Figure 5 by Fig. 1, the restriction portion 211 on the described throttling valve core 21 is the little smooth curved surface solid of rotation of the big end of an end, and the sidewall of the restriction portion 211 on the throttling valve core 21 cross section that evenly distributes is the notch 212 of " U " type.Restriction portion 211 improvement in shape on the throttling valve core 21 makes throttling valve core 21 have metering characteristics preferably.
By shown in Figure 5, described notch 212 is divided into big notch and little notch by width, and big notch and little notch are spaced apart.Big notch and little notch are respectively 2, and its width and quantity are confirmed according to the size of required flow.
Combine Fig. 2, Fig. 3, shown in Figure 6 by Fig. 1, described pilot valve 4 mainly is made up of guide's valve body 43, guide's valve seat 44, pilot valve core assembly 45 and first conducting magnetic iron 46, and pilot valve core assembly 45 links to each other with first conducting magnetic iron 46 interior iron cores; Safety valve 5 mainly is made up of Safety valve body 53, emergency valve seat 54 and safety valve core assembly 55, and safety valve core assembly 55 links to each other with adjusting screw rod 56; Spring seat 35 on the fixed poor overflow assembly 3 is fixed on the Safety valve body 53.The size of current of elder generation's conducting magnetic iron 46 can be controlled the pressure in the ante-chamber 41 of pilot valve, and adjusting screw rod 56 can be regulated the pressure maximum of the ante-chamber 51 of safety valve.After pilot valve 4 was opened, constant difference overflow valve just can carry out work.
Combine Fig. 2, Fig. 3, shown in Figure 6 by Fig. 1; Described Safety valve body 53 is provided with first passage 531, second channel 532, third channel 533, four-way 534 and five-way road 535; First passage 531 is communicated with the ante-chamber 51 of safety valve and the ante-chamber 41 of pilot valve; Second channel 532 is communicated with the spring chamber 52 of safety valve and the spring chamber 42 of pilot valve; Third channel 533 is communicated with the ante-chamber 51 of safety valve and the ante-chamber 51 that goes out oil pocket 27, the four-ways 534 connection safety valves of throttle valve and spring chamber 37, the five-way roads 535 of constant difference overflow valve and is communicated with the spring chamber 52 of safety valves and the spring chamber 28 of throttle valve.External pipeline has been removed in the setting of inner passage, makes structure compact, easy for installation more, and voltage endurance capability is high, the joint oil leakage phenomenon when having avoided adopting pipe to connect.
Combined shown in Figure 3ly by Fig. 1, the described first damping R1 is installed in the four-way 534, and the second damping R2 is installed in the third channel 533.
The working principle of the utility model is following:
1. Flow-rate adjustment: through regulating the input current of throttling electromagnet 25, change the aperture of throttling valve core 21 in the throttle valve assembly 2, the aperture and the input current value of throttling valve core 21 are proportional; When aperture was constant, the pressure reduction at orifice union 2 two ends kept constant through the fixed poor overflow assembly 3 of plug-in type, according to the flow rate calculation formula, can realize the constant flow adjusting.
2. pressure is regulated: through regulating the input current of first conducting magnetic iron 46, change the cracking pressure of pilot valve core assembly 45, and through the pressure of fixed poor overflow assembly 3 restriction oil inlet P, and then the working pressure of restraint of labour hydraulic fluid port A, realize the pressure of system is regulated.
During work; Throttling electromagnet 25 and first conducting magnetic iron 46 energized, orifice union 2 is opened, and system pressure oil gets into from oil inlet P; Through the oil suction chamber 26 of throttle valve, go out oil pocket 27 and get into actuator port A; A part of pressure oil gets into the ante-chamber 51 of safety valve, the ante-chamber 41 of pilot valve successively through the second damping R2 simultaneously, and pilot valve 4 is opened, and the spring chamber 28 of the spring chamber 42 of pressure oil entering pilot valve, the spring chamber 52 of safety valve, throttle valve is after control return opening Y oil sump tank.At this moment; Spring chamber 37 loops of constant difference overflow valve are open-minded; Fixed poor overflow assembly 3 work; The spring chamber 52 of the ante-chamber 41 of ante-chamber 51 through the first damping R1, safety valve of the pressure of control oil inlet P, the oil return in the spring chamber 37 of constant difference overflow valve, pilot valve, the spring chamber 42 of pilot valve, safety valve, the spring chamber 28 of throttle valve are after control return opening Y oil sump tank.
Claims (7)
1. ratio pressure flow compound control valve; Comprise two Proportional valve pieces (1), orifice union (2), fixed poor overflow assembly (3), pilot valve (4) and safety valve (5); Orifice union (2) forms throttle valve and the constant difference overflow valve that links to each other with fixed shared pair of Proportional valve piece of poor overflow assembly (3) (1); Pilot valve (4) and safety valve (5) are installed in the homonymy of two Proportional valve pieces (1); Pilot valve (4) is provided with the ante-chamber (41) of pilot valve and the spring chamber (42) of pilot valve, and safety valve (5) is provided with the ante-chamber (51) of safety valve and the spring chamber (52) of safety valve, and the ante-chamber of pilot valve (41) communicates with the ante-chamber (51) of safety valve; The spring chamber of pilot valve (42) communicates with the spring chamber (52) of safety valve; It is characterized in that: described fixed poor overflow assembly (3) is plug-in type logical valve structure, mainly is made up of valve pocket (31), spool (32), spring (33), valve seat (34) and spring seat (35), and valve seat (34) is an one and an end that is arranged on valve pocket (31) with valve pocket (31); Spool (32), spring (33) and spring seat (35) are contained in the valve pocket (31) successively; Valve pocket (31) inserts in two Proportional valve pieces (1) and valve seat (34) communicates with filler opening (P), and the sidewall of valve pocket (31) is provided with through hole (36), and described through hole (36) communicates with the interior return opening (T) of two Proportional valve pieces (1); The spring chamber of constant difference overflow valve (37) communicates with the ante-chamber (51) of safety valve, the ante-chamber (41) of pilot valve through first damping (R1) successively.
2. a kind of ratio pressure flow compound control valve according to claim 1; It is characterized in that: orifice union (2) mainly is made up of throttling valve core (21), Returnning spring (22) and end cap (23); Throttling valve core (21) links to each other with throttling electromagnet (25) through controlling rod (24); Between throttling valve core (21) and the two Proportional valve piece (1) oil suction chamber (26) arranged, go out the spring chamber (28) of oil pocket (27) and throttle valve; The oil suction chamber of throttle valve (26) communicates with filler opening (P); Oil pocket (27) the connection actuator port (A) that goes out of throttle valve communicates with the ante-chamber (51) of safety valve, the ante-chamber (41) of pilot valve through second damping (R2) simultaneously successively, and the spring chamber of throttle valve (28) communicates with the spring chamber (52) of safety valve, the spring chamber (42) of pilot valve successively, and end cap (23) is provided with the control return opening (Y) that communicates with the spring chamber (28) of throttle valve.
3. a kind of ratio pressure flow compound control valve according to claim 2; It is characterized in that: the restriction portion (211) on the throttling valve core (21) is the little smooth curved surface solid of rotation of the big end of an end, and the sidewall of the restriction portion (211) on the throttling valve core (21) cross section that evenly distributes is the notch (212) of " U " type.
4. a kind of ratio pressure flow compound control valve according to claim 3, it is characterized in that: described notch (212) is divided into big notch and little notch by width, and big notch and little notch are spaced apart.
5. according to claim 2,3 or 4 described a kind of ratio pressure flow compound control valves; It is characterized in that: pilot valve (4) mainly is made up of guide's valve body (43), guide's valve seat (44), pilot valve core assembly (45) and first conducting magnetic iron (46), and pilot valve core assembly (45) links to each other with the interior iron core of first conducting magnetic iron (46); Safety valve (5) mainly is made up of Safety valve body (53), emergency valve seat (54) and safety valve core assembly (55), and safety valve core assembly (55) links to each other with adjusting screw rod (56); Spring seat (35) on the fixed poor overflow assembly (3) is fixed on the Safety valve body (53).
6. a kind of ratio pressure flow compound control valve according to claim 5; It is characterized in that: Safety valve body (53) is provided with first passage (531), second channel (532), third channel (533), four-way (534) and five-way road (535); First passage (531) is communicated with the ante-chamber (51) of safety valve and the ante-chamber (41) of pilot valve; Second channel (532) is communicated with the spring chamber (52) of safety valve and the spring chamber (42) of pilot valve; Third channel (533) be communicated with safety valve ante-chamber (51) and throttle valve go out oil pocket (27); Four-way (534) is communicated with the ante-chamber (51) of safety valve and the spring chamber (37) of constant difference overflow valve, and five-way road (535) are communicated with the spring chamber (52) of safety valve and the spring chamber (28) of throttle valve.
7. a kind of ratio pressure flow compound control valve according to claim 6, it is characterized in that: first damping (R1) is installed in the four-way (534), and second damping (R2) is installed in the third channel (533).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203544038U CN202228452U (en) | 2011-09-21 | 2011-09-21 | Ratio pressure flow composite control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203544038U CN202228452U (en) | 2011-09-21 | 2011-09-21 | Ratio pressure flow composite control valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202228452U true CN202228452U (en) | 2012-05-23 |
Family
ID=46079039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203544038U Expired - Lifetime CN202228452U (en) | 2011-09-21 | 2011-09-21 | Ratio pressure flow composite control valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202228452U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112483498A (en) * | 2020-11-30 | 2021-03-12 | 杭州精工液压机电制造有限公司 | Engineering machinery air conditioner control valve with proportional throttle valve and control method |
| CN116733807A (en) * | 2023-08-08 | 2023-09-12 | 山西斯普瑞机械制造股份有限公司 | Pressure and flow double proportional valve |
-
2011
- 2011-09-21 CN CN2011203544038U patent/CN202228452U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112483498A (en) * | 2020-11-30 | 2021-03-12 | 杭州精工液压机电制造有限公司 | Engineering machinery air conditioner control valve with proportional throttle valve and control method |
| CN116733807A (en) * | 2023-08-08 | 2023-09-12 | 山西斯普瑞机械制造股份有限公司 | Pressure and flow double proportional valve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100414154C (en) | Direct action type proportional pressure-reducing valve | |
| CN201187492Y (en) | Anti-flow saturation combined proportional operating valve | |
| CN205859196U (en) | The valve body of regulating flow quantity | |
| CN105090600A (en) | Novel electric-hydraulic proportional overflow valve | |
| CN103062144B (en) | A kind of load sensing multi-way valve with anti-saturation function | |
| CN105402182B (en) | Load sensing multiple directional control valve and loader hydraulic control system | |
| CN202228452U (en) | Ratio pressure flow composite control valve | |
| CN207526791U (en) | Controllable pilot operated compound relief valve | |
| CN201363330Y (en) | Plate-type one-way speed-regulating valve | |
| CN107725842A (en) | The ratio one-way flow valves of double-direction control | |
| CN107504005A (en) | The pressure repairing banked direction control valves that a kind of band action judges | |
| CN107883028B (en) | The ratio one-way flow valves of double-direction control | |
| CN207212804U (en) | The manual load sensing multi-way valve of type of priority | |
| CN106168234B (en) | A kind of constant displacement pump variable delivery hydraulic system | |
| CN201513403U (en) | Multistage cylinder integrated control hydraulic valve group | |
| CN209414295U (en) | A kind of logical valve | |
| CN116181727B (en) | Energy-saving type electric control multi-way valve with proportion | |
| CN101865172A (en) | Active piloted active servo proportional valve | |
| CN201714731U (en) | Valve rod of confluent valve for multiway valve | |
| CN106438135A (en) | Relief valve device | |
| CN200975530Y (en) | Direct-action proportional relief pressure valve | |
| CN111396391B (en) | High-precision large-flow multi-way valve with disturbance compensation | |
| CN204187054U (en) | One-way throttle valve | |
| CN202418770U (en) | Stacked proportional electromagnetic balance valve | |
| CN209146307U (en) | A kind of main pressure control valve of automatic gearbox hydraulic coupling control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120523 |
|
| CX01 | Expiry of patent term |