CN209838490U - Electromagnetic drive air valve device - Google Patents
Electromagnetic drive air valve device Download PDFInfo
- Publication number
- CN209838490U CN209838490U CN201920395811.4U CN201920395811U CN209838490U CN 209838490 U CN209838490 U CN 209838490U CN 201920395811 U CN201920395811 U CN 201920395811U CN 209838490 U CN209838490 U CN 209838490U
- Authority
- CN
- China
- Prior art keywords
- armature
- ring
- magnetic conduction
- sleeve
- magnetic
- 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 - Fee Related
Links
Landscapes
- Magnetically Actuated Valves (AREA)
Abstract
The utility model discloses an electromagnetic drive air valve device, which comprises an upper end cover, a lower end cover, a shell and an air valve push rod; coil brackets are symmetrically arranged on two sides in the shell, and control coils are embedded in the coil brackets; the upper and lower sides of the coil support are respectively provided with an upper magnetic end cover and a lower magnetic end cover; a permanent magnet pole ring sleeve is arranged on the inner side of the coil support; the inner side of the permanent magnet polar ring sleeve is provided with a magnetic conduction sleeve; the upper end and the lower end of the magnetic conduction sleeve are respectively provided with an upper magnetic conduction block and a lower magnetic conduction block; a guide sleeve is arranged between the upper magnetic conduction block and the lower magnetic conduction block, an armature component fixedly connected with the valve push rod is arranged in the guide sleeve, and the armature component is embedded in the guide sleeve by the first copper ring and the second copper ring to form sliding connection. The utility model discloses can effectual reduction consumption of electric energy, it is small to have, advantage that space utilization is high.
Description
Technical Field
The utility model relates to an electromagnetic drive valve system, especially an electromagnetic drive valve device.
Background
Conventional engine valve actuation is dominated by various cam actuations, with valve opening and closing being dependent on cam shape. Once the cam shape is determined, the valve opening duration, closing duration, and valve lift are determined. The valve motion law is fixed with respect to the crank angle. Therefore, due to the limitation of the structure, the cam driving valve mechanism is difficult to achieve good dynamic property, fuel economy and emission performance under different working conditions.
Cam driven variable valve actuation mechanisms have been greatly developed for optimal engine performance. The valve timing or the valve lift of the valve mechanism is changed mainly by changing the linearity of the cam and the phase of the cam shaft, so that the defect that the valve timing and the valve lift cannot be changed is optimized to a certain extent. But these adjustments. The timing of air distribution and the lift of the valve can be optimized to a certain extent, the adjustment is still restricted by the cam line type, and the optimal requirement of the engine under all working conditions can only be met under partial working conditions.
The double-electromagnet driving valve mechanism completely cancels a cam structure, and takes an electromagnet as an output force device to replace a cam. The typical electromagnetic driving valve structure uses double springs and double electromagnets as main components, the valve is in a half-open and half-close state at a balance position, the valve, the spring and the armature are a vibration system, the electromagnets arranged at two ends can supplement energy consumed by the system due to overcoming of friction resistance and the like in the motion process, and the valve is kept closed and opened at a proper time of the motion by means of the electromagnets. However, the following problems still exist in the typical dual electromagnet driven valve mechanism: (1) the valve needs to consume electric energy when keeping an open or closed state; (2) when the air gap of the electromagnet is larger, the same suction force is generated, and larger current is needed; (3) the structure is complicated, the volume is large, and the use is inconvenient.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an electromagnetic drive valve device. The utility model discloses can effectual reduction consumption of electric energy, it is small to have, advantage that space utilization is high.
The technical scheme of the utility model: an electromagnetic drive air valve device comprises an upper end cover, a lower end cover, a shell and an air valve push rod, wherein a first coil wire hole is formed in the edge of the upper end cover; coil brackets are symmetrically arranged on two sides in the shell, and control coils are embedded in the coil brackets; an upper magnetic end cover and a lower magnetic end cover are respectively arranged on the upper side and the lower side of the coil support, and a second coil wire hole communicated with the first coil wire hole is formed in the upper magnetic end cover; the inner side of the coil support is provided with a permanent magnet pole ring sleeve, and the permanent magnet pole ring sleeve comprises a first yoke iron, a second yoke iron and a third yoke iron; a first permanent magnet is arranged between the first yoke iron and the second yoke iron; a second permanent magnet is arranged between the second yoke iron and the third yoke iron; the inner side of the permanent magnet polar ring sleeve is provided with a magnetic conduction sleeve, the magnetic conduction sleeve comprises a first magnetic conduction ring, a second magnetic conduction ring and a third magnetic conduction ring, and a first magnetism isolating ring is arranged between the first magnetic conduction ring and the second magnetic conduction ring; a second magnetism isolating ring is arranged between the second magnetism conducting ring and the third magnetism conducting ring; the upper end and the lower end of the magnetic conduction sleeve are respectively provided with an upper magnetic conduction block and a lower magnetic conduction block; a guide sleeve is arranged between the upper magnetic conduction block and the lower magnetic conduction block, an armature component fixedly connected with the valve push rod is arranged in the guide sleeve, and the armature component comprises a first armature, a second armature and a third armature; a first armature is provided with a first copper ring; a second copper ring is arranged on the third armature; the first copper ring and the second copper ring enable the armature component to be nested in the guide sleeve to form sliding connection.
In the electromagnetic drive valve device, the inner end surfaces of the upper magnetic conduction block and the lower magnetic conduction block are respectively provided with the upper limiting sheet and the lower limiting sheet.
In the electromagnetic drive valve device, the valve push rod is respectively provided with the upper nut and the lower nut, and the upper nut and the lower nut respectively fix the first armature, the second armature and the third armature on the valve push rod through the corresponding gaskets.
In the electromagnetic drive valve device, the cross-sectional surfaces of the first copper ring and the second copper ring are rectangular, and the first copper ring and the second copper ring have the same structural size.
In the electromagnetic drive valve device, an annular groove is formed on the outer side of the second armature.
According to the electromagnetic drive valve device, the first armature and the third armature are convex, convex surfaces of the first armature and the second armature are arranged oppositely, and the second armature is nested between the first armature and the third armature.
According to the electromagnetic drive valve device, the maximum outer diameters of the first armature, the second armature and the third armature are the same, are smaller than the inner diameter of the guide sleeve, and are larger than the inner hole diameters of the upper magnetic conduction block and the lower magnetic conduction block.
In the electromagnetic drive valve device, when the armature assembly is at the intermediate position, the upper end point D of the first copper ring is located between the inner end points a and B of the first magnetic isolation ring in the Y-axis direction; the lower end point E of the first copper ring is arranged between the inner end points B and C of the second magnetic conduction ring; the end points F and G on the second armature are between the end points B and C in the second magnetic permeable ring.
In the electromagnetic drive valve device, the first copper ring and the second copper ring are made of a material with good magnetic isolation and low friction.
According to the electromagnetic drive valve device, the guide sleeve is made of low-friction aluminum alloy materials.
Compared with the prior art, the utility model discloses an upper end cover, the lower extreme cover, shell and valve push rod, set gradually armature subassembly from inside to outside in the shell, the guide pin bushing, the flux sleeve, permanent magnetism polar ring cover and coil former, the embedded control coil that is equipped with of coil former, when letting in constant current in the control coil, the control magnetic field that the coil produced and the polarized magnetic field that first permanent magnet and second permanent magnet produced act on armature subassembly jointly, make armature subassembly one end magnetic field strengthened, other end magnetic field weakens, this makes armature subassembly to receiving the big direction motion of magnetic field force. Along with the movement of the armature component, the internal magnetic circuit of the electromagnetic drive valve is continuously changed, a second armature in the armature component is subjected to electromagnetic force of which the movement direction is opposite to that of the second magnetic conduction ring, the total magnetic force applied to the armature component in the upward movement process is smaller and smaller, and the movement speed of the armature component is lower and lower. When the armature assembly moves to the upper end part, the current is cut off, and the armature assembly still receives upward magnetic force provided by the first permanent magnet and the second permanent magnet, so that the aim of keeping zero power consumption is fulfilled; after control currents with different polarities are introduced, the second armature is subjected to downward magnetic force of the second magnetic conduction ring, and the third armature is subjected to downward magnetic force of the third magnetic conduction ring, so that the armature component moves in an accelerating mode under the action of the downward magnetic force, and the operation is repeated in a circulating mode to achieve the purpose of opening and closing the valve. Therefore, the air valve is in the bistable state when being kept at the two ends, the magnetic force generated by the permanent magnet is used as the holding force to keep the air valve at the two ends, the action of electromagnetic force is not needed, and the power can be completely cut off to reduce the consumption of electric energy; the utility model can make the armature bear the electromagnetic force opposite to the movement direction in the latter half of the movement, thereby reducing the seating speed of the valve from the structural arrangement; compared with a double electromagnet driving valve mechanism, when the air gap is larger, the current required for generating the same attraction force is smaller, and the armature component has the characteristic of automatically returning to the middle point, so that the consumption of electric energy can be effectively reduced. The utility model discloses compare with current electro-magnet drive valve, still cancelled the setting of spring, reduced the volume of whole mechanism greatly, improved space utilization.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic view of an armature assembly of the present invention;
fig. 3 is a schematic view of the assembly of the armature, the guide sleeve and the flux sleeve of the present invention;
fig. 4 is a schematic structural view of the permanent magnet polar ring sleeve of the present invention;
FIG. 5 is a partial enlarged view of the structure of the armature, the guide sleeve and the flux sleeve of the present invention;
fig. 6 is a graph showing the displacement-force simulation curve of the electromagnetic driving valve of the present invention.
The labels in the figures are: 1-upper end cover, 2-upper magnetic end cover, 3-upper magnetic conductive block, 4-first yoke, 5-second yoke, 6-third yoke, 7-first permanent magnet, 8-second permanent magnet, 9-coil, 10-coil rack, 11-lower magnetic conductive end cover, 12-lower magnetic conductive block, 13-lower end cover, 14, first magnetic conductive ring, 15-second magnetic conductive ring, 16-third magnetic conductive ring, 17-first magnetic isolation ring, 18-second magnetic isolation ring, 19-lower limiting sheet, 20-shell, 21-valve push rod, 22-upper nut, 23-gasket, 24-first armature, 25-second armature, 26-third armature, 27-first copper ring, 28-second copper ring, 29-first coil wire hole, 30-a second coil wire hole, 31-an upper limiting sheet, 32-a guide sleeve, 33-a lower nut, 34-a permanent magnet pole ring sleeve, 35-a magnetic conduction sleeve, 36-an armature component and 37-an annular groove.
Detailed Description
The following description is made with reference to the accompanying drawings and examples, but not to be construed as limiting the invention.
Example (b): an electromagnetically actuated valve assembly as shown in figures 1 to 5 of the accompanying drawings: the valve opening device comprises an upper end cover 1, a lower end cover 13, a shell 20 and a valve push rod 21, wherein a first coil wire hole 29 is formed in the edge of the upper end cover 1; coil brackets 10 are symmetrically arranged on two sides in the shell 20, and control coils 9 are embedded in the coil brackets 10; an upper magnetic end cover 2 and a lower magnetic end cover 11 are respectively arranged on the upper side and the lower side of the coil support 10, and a second coil wire hole 30 communicated with the first coil wire hole 29 is arranged on the upper magnetic end cover 2; a permanent magnet pole ring sleeve 34 is arranged on the inner side of the coil support 10, and the permanent magnet pole ring sleeve 34 comprises a first yoke iron 4, a second yoke iron 5 and a third yoke iron 6; a first permanent magnet 7 is arranged between the first yoke iron 4 and the second yoke iron 5; a second permanent magnet 8 is arranged between the second yoke iron 5 and the third yoke iron 6; the permanent magnet pole ring sleeve 34 is used for enhancing the suction force of the electromagnetic coil and sealing the magnetic force lines generated by the electromagnetic coil inside, so that the efficiency of the electromagnetic coil is improved; the inner side of the permanent magnet pole ring sleeve 34 is provided with a magnetic conduction sleeve 35, the magnetic conduction sleeve 35 comprises a first magnetic conduction ring 14, a second magnetic conduction ring 15 and a third magnetic conduction ring 16, and a first magnetism isolating ring 17 is arranged between the first magnetic conduction ring 14 and the second magnetic conduction ring 15; a second magnetism isolating ring 18 is arranged between the second magnetism conducting ring 15 and the third magnetism conducting ring 16; the upper end and the lower end of the magnetic conduction sleeve 35 are respectively provided with an upper magnetic conduction block 3 and a lower magnetic conduction block 12; a guide sleeve 32 is arranged between the upper magnetic conduction block 3 and the lower magnetic conduction block 12, an armature component 36 fixedly connected with the valve push rod 21 is arranged in the guide sleeve 32, and the armature component 36 comprises a first armature 24, a second armature 25 and a third armature 26; a first copper ring 27 is arranged on the first armature 24; a second copper ring 28 is arranged on the third armature 26; the first and second copper rings 27, 28 nest the armature assembly 36 within the guide sleeve 32 to form a sliding connection.
Further, the inner end surfaces of the upper magnetic conduction block 3 and the lower magnetic conduction block 12 are respectively provided with an upper limiting sheet 31 and a lower limiting sheet 19.
Furthermore, the valve push rod 21 is provided with an upper nut 22 and a lower nut 33, respectively, and the upper nut 22 and the lower nut 33 fix the first armature 24, the second armature 25 and the third armature 26 on the valve push rod 21 through corresponding gaskets 23, respectively.
Furthermore, the cross section of the first copper ring 27 and the second copper ring 28 is rectangular, and the first copper ring 27 and the second copper ring 28 have the same structural size.
Further, the outer side of the second armature 25 is provided with an annular groove 37.
Further, the first armature 24 and the third armature 26 are convex, the convex surfaces of the first armature 24 and the second armature 25 are oppositely arranged, and the second armature 25 is nested between the first armature 24 and the third armature 26.
Further, the maximum outer diameters of the first armature 24, the second armature 25 and the third armature 26 are the same, and are smaller than the inner diameter of the guide sleeve 32 and larger than the inner hole diameters of the upper magnetic conductive block 3 and the lower magnetic conductive block 12.
Further, when the armature assembly is in the middle position, the upper end point D of the first copper ring 27 is between the inner end points a and B of the first magnetic isolation ring in the Y-axis direction; the lower end point E of the first copper ring 27 is between the inner end points B and C of the second magnetic conductive ring 15; the end points F and G on the second armature are between the end points B and C in the second magnetically permeable ring 15.
Furthermore, the first copper ring 27 and the second copper ring 28 are made of materials with good magnetic isolation and low friction; the material with good magnetic isolation and low friction is brass, copper-based bearing alloy or polyamide.
Further, the guide sleeve 32 is made of low-friction aluminum alloy material; the material with good magnetic isolation and low friction is brass, copper-based bearing alloy or polyamide.
The applicant has also tested the present invention, as shown in fig. 6, when the armature assembly 36 is located in the middle of the guide sleeve 32 (i.e. X ═ 0 mm) and is excited by I ═ 874At, the electromagnetic force applied is about 65N, and the armature assembly 36 accelerates under the action of the upward electromagnetic force; when the armature assembly 36 moves to a position between the positions of 2.5mm to 3.6mm, the armature assembly 36 is acted by downward electromagnetic force, and the armature assembly performs deceleration movement; when the armature assembly 36 reaches the end, the current in the coil is cut off, and the armature assembly 36 still receives the upward holding force generated by the first permanent magnet 7 and the second permanent magnet 8, so that the armature assembly 36 can be held at the end with zero power consumption; when the coil is energized At I-874 At, the armature assembly 36 is subjected to an electromagnetic force of about-22N, and the armature assembly 36 is accelerated downward, and so on.
Principle of operation
The utility model discloses a when letting in constant current to control coil 9, the control magnetic field that control coil 9 produced and the polarized magnetic field that first permanent magnet 7 and second permanent magnet 8 produced act on armature subassembly 36 jointly for 36 one end magnetic fields of armature subassembly are strengthened, and other end magnetic field receives and weakens, and this makes armature subassembly 36 to receiving the big direction motion of magnetic field force. As the armature assembly 36 moves, the internal magnetic circuit of the electromagnetically driven valve changes continuously, the second armature 25 in the armature assembly 36 is subjected to the electromagnetic force of the second magnetic conductive ring 15 opposite to the moving direction, the total magnetic force applied to the armature assembly 36 during the upward movement is smaller and smaller, and the moving speed of the armature assembly 36 is lower and lower. When the armature assembly 36 moves to the upper end part, the current is cut off, and the armature assembly 36 still receives upward magnetic force provided by the first permanent magnet 7 and the second permanent magnet 8, so that the aim of keeping zero power consumption is fulfilled; after control currents with different polarities are introduced, the second armature 25 is subjected to downward magnetic force of the second magnetic conductive ring 15, and the third armature 26 is subjected to downward magnetic force of the third magnetic conductive ring 16, so that the armature assembly 36 accelerates under the action of the downward magnetic force, and the operation is repeated in a circulating manner to achieve the purpose of opening and closing the valve.
Claims (10)
1. An electromagnetic drive valve device, characterized in that: the air valve comprises an upper end cover (1), a lower end cover (13), a shell (20) and an air valve push rod (21), wherein a first coil wire hole (29) is formed in the edge of the upper end cover (1); coil brackets (10) are symmetrically arranged on two sides in the shell (20), and control coils (9) are embedded in the coil brackets (10); an upper magnetic end cover (2) and a lower magnetic end cover (11) are respectively arranged on the upper side and the lower side of the coil support (10), and a second coil wire hole (30) communicated with the first coil wire hole (29) is formed in the upper magnetic end cover (2); a permanent magnet pole ring sleeve (34) is arranged on the inner side of the coil support (10), and the permanent magnet pole ring sleeve (34) comprises a first yoke (4), a second yoke (5) and a third yoke (6); a first permanent magnet (7) is arranged between the first yoke (4) and the second yoke (5); a second permanent magnet (8) is arranged between the second yoke iron (5) and the third yoke iron (6); the inner side of the permanent magnet pole ring sleeve (34) is provided with a magnetic conduction sleeve (35), the magnetic conduction sleeve (35) comprises a first magnetic conduction ring (14), a second magnetic conduction ring (15) and a third magnetic conduction ring (16), and a first magnetism isolating ring (17) is arranged between the first magnetic conduction ring (14) and the second magnetic conduction ring (15); a second magnetism isolating ring (18) is arranged between the second magnetism conducting ring (15) and the third magnetism conducting ring (16); the upper end and the lower end of the magnetic conduction sleeve (35) are respectively provided with an upper magnetic conduction block (3) and a lower magnetic conduction block (12); a guide sleeve (32) is arranged between the upper magnetic conduction block (3) and the lower magnetic conduction block (12), an armature component (36) fixedly connected with the valve push rod (21) is arranged in the guide sleeve (32), and the armature component (36) comprises a first armature (24), a second armature (25) and a third armature (26); a first copper ring (27) is arranged on the first armature iron (24); a second copper ring is arranged on the third armature (26); the first copper ring (27) and the second copper ring (28) enable the armature component (36) to be nested in the guide sleeve (32) to form sliding connection.
2. An electromagnetically driven valve apparatus as claimed in claim 1, wherein: the inner end surfaces of the upper magnetic conduction block (3) and the lower magnetic conduction block (12) are respectively provided with an upper limiting sheet (31) and a lower limiting sheet (19).
3. An electromagnetically driven valve apparatus as claimed in claim 1, wherein: an upper nut (22) and a lower nut (33) are respectively arranged on the valve push rod (21), and the upper nut (22) and the lower nut (33) respectively fix the first armature (24), the second armature (25) and the third armature (26) on the valve push rod (21) through corresponding gaskets (23).
4. An electromagnetically driven valve apparatus as claimed in claim 1, wherein: the section of the first copper ring (27) and the section of the second copper ring (28) are rectangular, and the first copper ring (27) and the second copper ring (28) are identical in structure size.
5. An electromagnetically driven valve apparatus as claimed in claim 1, wherein: an annular groove (37) is arranged on the outer side of the second armature (25).
6. An electromagnetically driven valve apparatus as claimed in claim 1, wherein: the first armature (24) and the third armature (26) are convex, convex surfaces of the first armature (24) and the second armature (25) are arranged oppositely, and the second armature (25) is nested between the first armature (24) and the third armature (26).
7. An electromagnetically driven valve apparatus as claimed in claim 1, wherein: the maximum outer diameters of the first armature (24), the second armature (25) and the third armature (26) are the same, are smaller than the inner diameter of the guide sleeve (32), and are larger than the inner hole diameters of the upper magnetic conduction block (3) and the lower magnetic conduction block (12).
8. An electromagnetically driven valve apparatus as claimed in claim 1, wherein: when the armature component is at the middle position, the upper end point D of the first copper ring (27) is between the inner end points A and B of the first magnetic isolation ring in the Y-axis direction; the lower end point E of the first copper ring (27) is arranged between the inner end points B and C of the second magnetic conductive ring (15); the end points F and G on the second armature are between the end points B and C in the second magnetic conduction ring (15).
9. An electromagnetically driven valve apparatus as claimed in claim 1, wherein: the first copper ring (27) and the second copper ring (28) are made of materials with good magnetic isolation and low friction.
10. An electromagnetically driven valve apparatus as claimed in claim 1, wherein: the guide sleeve (32) is made of low-friction aluminum alloy materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920395811.4U CN209838490U (en) | 2019-03-27 | 2019-03-27 | Electromagnetic drive air valve device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920395811.4U CN209838490U (en) | 2019-03-27 | 2019-03-27 | Electromagnetic drive air valve device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209838490U true CN209838490U (en) | 2019-12-24 |
Family
ID=68908190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920395811.4U Expired - Fee Related CN209838490U (en) | 2019-03-27 | 2019-03-27 | Electromagnetic drive air valve device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209838490U (en) |
-
2019
- 2019-03-27 CN CN201920395811.4U patent/CN209838490U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8461951B2 (en) | Bistable magnetic actuators | |
| US5515818A (en) | Electromechanical variable valve actuator | |
| US8854165B2 (en) | Soft latch bidirectional quiet solenoid | |
| CN106575562A (en) | Composite magnetic circuit double-permanent magnet electromagnet and composite magnetic circuit double-permanent magnet high-speed solenoid valve | |
| US6763789B1 (en) | Electromagnetic actuator with permanent magnet | |
| US20090021334A1 (en) | Electromagnetic actuator | |
| US20160327176A1 (en) | Electromagnetic actuator and solenoid-valve device | |
| CN203826152U (en) | Electromagnetic promoting equipment and internal combustion set adjusting equipment | |
| JP2009512410A (en) | Permanent magnet electric valve and control system thereof | |
| CN101696740B (en) | Switch valve | |
| CN209838490U (en) | Electromagnetic drive air valve device | |
| CN106015593B (en) | A kind of switch electromagnetic valve for electro-hydraulic variable valve actuation | |
| US10808860B2 (en) | Latching pneumatic control valve | |
| JP2007056777A (en) | Solenoid-operated valve | |
| US9343217B2 (en) | Electromagnetic positioning device | |
| CN110656995B (en) | Combined type electromagnetic drive fully-variable valve actuating mechanism applied to internal combustion engine | |
| US11274579B2 (en) | Actuator control system for bi-stable electric rocker arm latches | |
| CN101737113B (en) | Multi-driving force coupled electric air valve of engine | |
| JPH11350929A (en) | Electromagnetic valve | |
| US7044438B2 (en) | Electromagnetic actuator with non-symmetrical magnetic circuit layout for actuating a gas-reversing valve | |
| US6298812B1 (en) | Valve driving apparatus provided in an internal combustion engine | |
| CN214505174U (en) | Quick-response large-stroke electromagnet | |
| CN214036894U (en) | Electromagnetic valve device | |
| CN212691001U (en) | Steady-state pulse electromagnetic valve | |
| RU2140034C1 (en) | Electrodynamic valve-actuating gear |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191224 Termination date: 20210327 |