CN207569209U - A kind of novel staged device for sealing magnetic fluid - Google Patents
A kind of novel staged device for sealing magnetic fluid Download PDFInfo
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- CN207569209U CN207569209U CN201721414451.5U CN201721414451U CN207569209U CN 207569209 U CN207569209 U CN 207569209U CN 201721414451 U CN201721414451 U CN 201721414451U CN 207569209 U CN207569209 U CN 207569209U
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- ring
- face
- pole shoe
- jackshaft
- pole tooth
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- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The utility model is related to a kind of novel staged device for sealing magnetic fluid, including multi-diameter shaft, shell, left pole shoe ring, right pole shoe ring, magnet ring I, permanent magnet assembly ring；The multi-diameter shaft includes multigroup secondary axis that the jackshaft of diameter maximum and diameter are sequentially reduced；Permanent magnet assembly ring is set on the outer ring of the jackshaft, intermediate collar is further sleeved on the outer ring of the permanent magnet assembly ring；The position of corresponding intermediate collar periphery is provided with magnet ring on the inner wall of the shell；The left pole shoe, right pole shoe are respectively arranged on magnet ring both sides, be respectively equipped with the pole tooth I axially extended on the left pole shoe, each end face of right pole shoe, the left pole shoe, right pole shoe each inner ring surface on the periphery of corresponding secondary axis be provided with the pole tooth II radially extended.The purpose of this utility model is to provide a kind of sealing device of magnetic source tandem type staged magnetic fluid, can solve the problems, such as that magnet fluid sealing pressure resistance performance is low.
Description
Technical field
The invention belongs to sealing field of mechanical engineering, and in particular to a kind of novel staged device for sealing magnetic fluid.
Background technology
In device for sealing magnetic fluid, the performance of magnetic fluid can gradually fail with the increase of seal clearance, thus close
The voltage endurance capability of seal apparatus can decline therewith, be sealed although current Magneticfluid Seal Technique is applied in major diameter, high-speed overload
In environment, but the pressure-resistant performance for improving magnet fluid sealing under wide arc gap is still current problem to be solved.
One of the method for improving magnet fluid sealing pressure resistance performance under wide arc gap be by improving magnetic fluid sealing structure, it is such as right
Than the 2 (Publication No. of sealing device and documents described in document 1 (patent of Publication No. CN 103115152A)
The patent of CN103498939A) described in sealing device.Although the relatively common magnetic current of two kinds of sealing devices described in document above
Body sealing performance is greatly improved, but the high sealing performance of the special operation conditions such as high-speed overload is still not achieved in its sealing performance
It is required that.
Magnet fluid sealing is to generate magnetic field force in seal clearance using permanent magnet magnetic fluid is secured firmly between sealing
In gap, the pressure difference of both sides is resisted, so as to achieve the effect that sealing.
Invention content
The object of the present invention is to provide a kind of novel staged device for sealing magnetic fluid, and it is resistance to can to solve magnet fluid sealing
The problem for pressing performance low so that this sealing technique can play good effect in high-speed overload field.
Technical scheme is as follows：
The novel staged device for sealing magnetic fluid, including multi-diameter shaft, shell, left pole shoe ring, right pole shoe ring, forever
Magnet ring I, permanent magnet assembly ring, the multi-diameter shaft are set within shell；
The multi-diameter shaft includes multigroup secondary axis that the jackshaft of diameter maximum and diameter are sequentially reduced, the secondary
Axis is arranged along the side of jackshaft, symmetrical to demarcate using the intermediate radial section of jackshaft；
Permanent magnet assembly ring is set on the outer ring of the jackshaft, is also set on the outer ring of the permanent magnet assembly ring
There is intermediate collar；
The position of corresponding intermediate collar periphery is provided with magnet ring I, the permanent magnetism on the inner wall of the shell
There are gaps between body ring I and intermediate collar periphery；
The left pole shoe ring, right pole shoe ring are respectively arranged on I both sides of magnet ring, and left pole shoe ring, right pole shoe ring are mutually right
Claim；Left pole shoe ring, the end face of right pole shoe ring and the anchor ring and the periphery and end face respectively with intermediate collar and secondary axis
It is corresponding；The pole tooth I axially extended, the pole are respectively equipped in the left pole shoe ring, each end face of right pole shoe ring
Tooth I corresponds to the end face of the end face of jackshaft, intermediate collar and secondary axis, pole tooth I and jackshaft, intermediate collar and secondary axis respectively
Between there are gap, magnetic fluid is set in the gap；It is corresponding secondary in the left pole shoe ring, each inner ring surface of right pole shoe ring
The periphery of axis is provided with the pole tooth II radially extended, there are gap between the periphery of the pole tooth II and secondary axis,
Magnetic fluid is set in the gap.
The permanent magnet assembly ring is sleeved on by interference fit on jackshaft；The intermediate collar is matched by interference
Trap is on permanent magnet assembly ring.
The permanent magnet assembly ring includes the magnet ring II and magnetic guiding loop of same internal-and external diameter, the magnet ring II
Equipped with two groups, the magnetic guiding loop is located between two groups of magnet ring II.
The quantity of the secondary axis is 2-8 groups.
The secondary axis includes two level axis and three-level axis, and the left and right sides of the jackshaft sets gradually two level respectively
Axis and three-level axis, the jackshaft, two level axis, three-level axis diameter be sequentially reduced；
Anchor ring I, end face I, anchor ring II, end face II, annulus are respectively equipped in the left pole shoe ring and right pole shoe ring
Face III；
The anchor ring I is corresponding with the periphery of three-level axis, and there are skies between the anchor ring I and three-level axis
Gap；The anchor ring I is equipped with pole tooth II；The pole tooth II radially extends to the periphery of three-level axis, with three-level axis
Periphery between there are gap, magnetic fluid is placed in the gap；
The end face I is corresponding with the end face of two level axis, and the anchor ring II is corresponding with the periphery of two level axis；
The end face I is equipped with pole tooth I；The pole tooth I extends in an axial direction to the end face of two level axis, between the end face of two level axis
There are gap, magnetic fluid is placed in the gap；
The periphery of the anchor ring II two level axis is equipped with pole tooth II, and the pole tooth II is radially to two level axis
Periphery extends, and there are gap between the periphery of two level axis, magnetic fluid is placed in the gap；
The end face II is corresponding with the end face of jackshaft, and the anchor ring III is opposite with the periphery of jackshaft
It should；The end face II is equipped with two groups of pole tooth I, and one of which pole tooth I is in an axial direction to the boundary of jackshaft and magnet ring II
Place's extension, the end face of the corresponding jackshaft of a part of the end face of pole tooth I, another part of the end face of pole tooth I correspond to magnet ring
The end face of II, there are gap between pole tooth I and the end face of jackshaft and magnet ring II, magnetic fluid is placed in the gap；In addition
One group of pole tooth I extends in an axial direction to the intersection of intermediate collar and magnet ring II, and a part for the end face of pole tooth I is corresponding forever
The end face of magnet ring II, another part of the end face of pole tooth I correspond to the end face of intermediate collar, pole tooth I and intermediate collar and permanent magnetism
There are gap between the end face of body ring II, magnetic fluid is placed in the gap；The periphery and anchor ring of the intermediate collar
There are gaps between III.
Pole tooth I, the pole tooth II respectively by spaced 2-4 pole tooth groups into.
The novel staged device for sealing magnetic fluid, further includes left magnetism-isolating loop and right magnetism-isolating loop；It is described it is left every
Magnet ring is set on the left side of left pole shoe ring, is close to the inner wall setting of shell；The right magnetism-isolating loop is set on the left side of right pole shoe ring, tightly
Paste the inner wall setting of shell
The novel staged device for sealing magnetic fluid, further includes left bearing and right bearing, and the left bearing is set
In the left side of left magnetism-isolating loop, it is set on multi-diameter shaft；The right bearing is set on the right side of right magnetism-isolating loop, is set in multi-diameter shaft
On.
Groove is respectively equipped in the left pole shoe ring and the periphery of right pole shoe ring, the groove is equipped with sealing ring.
Axis is designed as hierarchic structure by the present invention, and left pole shoe ring and right pole shoe ring are separately designed as overall structure, and
Pole shoe inner ring surface opens up axially and radially pole tooth at position；So as to form stereo multi-dimensinal degree magnetic seal.Especially by centre
Setting permanent magnet, magnetic guiding loop, can effectively enhance the magnetic flux on multi-diameter shaft between axis and intermediate collar, be pole tooth and multi-diameter shaft
End face and the magnetic fluid of periphery provide better absorption, the loss of magnetic fluid when reducing seal failure.
In the present invention, the magnetic fluid that is injected on the pole tooth I on jackshaft, fluid-tight is in jackshaft and magnet ring II
On end face and magnet ring II and intermediate collar, magnetic fluid being capable of effective blockade jackshaft, magnet ring II, intermediate collars
Between interface, further improve sealing effect, while this is equivalent to and injects magnetic fluid in magnet ring II both ends of the surface, from
And realize a kind of source-series type staged magnet fluid sealing of axial magnetic, better suction-operated is provided, magnetic when reducing seal failure
The technique effect of the loss of fluid.
Moreover, setting permanent magnet and magnetic guiding loop form a kind of magnetic source series connection between jackshaft and intermediate collar in the present invention
The magnetic texure of type reduces the length of magnetic loop in magnet fluid sealing, further improves the magnetic in seal clearance in magnetic circuit
Flux can accomplish the loss reduction of the magnetic fluid in seal failure, substantially increase the magnet fluid sealing under the conditions of wide arc gap
Voltage endurance capability and sealing reliability, expand its range of safety operation.
Description of the drawings
Fig. 1 is the structure diagram of sealing device of the present invention；
Each serial number mark and corresponding title are as follows in figure：
1- multi-diameter shafts 1,2- shells, the left pole shoe rings of 3-, the right pole shoe rings of 4-, 5- magnet rings I, 6- centre collar, 7- poles tooth
I, 8- pole tooth II, 9- magnet rings II, 11- magnetic guiding loop, 12- anchor rings I, 13- end face I, 14- anchor rings II, 15- end face II,
The left magnetism-isolating loops of 16- anchor rings III, 17-, the right magnetism-isolating loops of 18-, 19- left bearings, 20- right bearings, 21- grooves, 22- sealing rings；
101- jackshafts, 102- two level axis, 103- three-level axis.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
As shown in Figure 1, the novel staged device for sealing magnetic fluid, including multi-diameter shaft 1, shell 2, left pole shoe ring
3rd, right pole shoe ring 4, magnet ring I5, permanent magnet assembly ring, the multi-diameter shaft 1 are set within shell 2；
The multi-diameter shaft 1 includes multigroup secondary axis that the jackshaft 101 of diameter maximum and diameter are sequentially reduced, described
Secondary axis is arranged along the side of jackshaft 101, symmetrical to demarcate using the intermediate radial section of jackshaft 101；
Permanent magnet assembly ring is set on the outer ring of the jackshaft 101, is gone back on the outer ring of the permanent magnet assembly ring
It is set with intermediate collar 6；
The position of corresponding intermediate 6 periphery of collar is provided with magnet ring I 5 on the inner wall of the shell 2, it is described forever
There are gaps between 6 periphery of magnet ring I 5 and intermediate collar；
The left pole shoe ring 3, right pole shoe ring 4 are respectively arranged on I 5 both sides of magnet ring, left pole shoe ring 3,4 phase of right pole shoe ring
It is mutually symmetrical；Left pole shoe ring 3, the end face of right pole shoe ring 4 and the anchor ring with respectively with intermediate collar 6 and the periphery of secondary axis
It is corresponding with end face；The pole tooth axially extended is respectively equipped in the left pole shoe ring 3, each end face of right pole shoe ring 4
I7, the pole tooth I7 correspond to the end face of jackshaft 101, intermediate collar 6 and secondary axis respectively, pole tooth I7 and jackshaft 101, in
Between there are gaps, magnetic fluid between the end face of collar 6 and secondary axis to be set in the gap；The left pole shoe ring 3, right pole shoe ring
The periphery of corresponding secondary axis is provided with the pole tooth II8 radially extended on 4 each inner ring surface, the pole tooth II8 with time
There are gaps, magnetic fluid between the periphery of grade axis to be set in the gap.
The permanent magnet assembly ring is sleeved on by interference fit on jackshaft 101；The intermediate collar 6 passed through
The engagement sleeves that are full of are on permanent magnet assembly ring.
The permanent magnet assembly ring includes the magnet ring II9 of same internal-and external diameter and magnetic guiding loop 11, the permanent magnet
Ring II9 is equipped with two groups, and the magnetic guiding loop 11 is located between two groups of magnet ring II9.
The quantity of the secondary axis is 2-8 groups.
The secondary axis includes two level axis 102 and three-level axis 103, the left and right sides of the jackshaft 101 respectively according to
Secondary setting two level axis 102 and three-level axis 103, the jackshaft 101, two level axis 102, three-level axis 103 diameter be sequentially reduced；
Anchor ring I12, end face I13, anchor ring II14, end face are respectively equipped in the left pole shoe ring 3 and right pole shoe ring 4
II15, anchor ring III16；
The anchor ring I12 is corresponding with the periphery of three-level axis 103, the anchor ring I12 and three-level axis 103 it
Between there are gaps；The anchor ring I12 is equipped with pole tooth II8；The pole tooth II8 is radially to the outer circle of three-level axis 103
Face extends, and there are gap between the periphery of three-level axis 103, magnetic fluid is placed in the gap；
The end face I13 is corresponding with the end face of two level axis 102, and the anchor ring II14 is outer with two level axis 102
Disc is corresponding；The end face I13 is equipped with pole tooth I7；The pole tooth I7 extends in an axial direction to the end face of two level axis 102,
There are gap between the end face of two level axis 102, magnetic fluid is placed in the gap；
The periphery of the anchor ring II14 two levels axis 102 be equipped with pole tooth II8, the pole tooth II8 radially to
The periphery extension of two level axis 102, there are gap between the periphery of two level axis 102, magnetic fluid is placed in the gap；
The end face II15 is corresponding with the end face of jackshaft 101, the anchor ring III16 and jackshaft 101
Periphery is corresponding；The end face II15 is equipped with two groups of pole tooth I7, and one of which pole tooth I7 is in an axial direction to 101 He of jackshaft
The intersection extension of magnet ring II9, the end face of the corresponding jackshaft 101 of a part of the end face of pole tooth I7, the end face of pole tooth I7
Another part correspond to the end face of magnet ring II9, between pole tooth I7 and the end face of jackshaft 101 and magnet ring II9 there are
Gap, magnetic fluid are placed in the gap；Another set pole tooth I7 is in an axial direction to intermediate collar 6 and the intersection of magnet ring II9
Extension, the end face of the corresponding magnet ring II9 of a part of the end face of pole tooth I7, another part correspondence of the end face of pole tooth I7 are intermediate
The end face of collar 6, there are gaps, magnetic fluid between pole tooth I7 and intermediate collar 6 and the end face of magnet ring II9 to be placed between this
In gap；There are gaps between the periphery of the intermediate collar 6 and anchor ring III16.
Pole tooth I7, the pole tooth II8 respectively by spaced 2-4 pole tooth groups into.
The novel staged device for sealing magnetic fluid, further includes left magnetism-isolating loop 17 and right magnetism-isolating loop 18；Described
Left magnetism-isolating loop 17 is set on the left side of left pole shoe ring 3, is close to the inner wall setting of shell 2；The right magnetism-isolating loop 18 is set on right pole shoe
The inner wall setting of shell 2 is close in the left side of ring 4
The novel staged device for sealing magnetic fluid, further includes left bearing 19 and right bearing 20, the left axle
19 left sides for being set on left magnetism-isolating loop 17 are held, are set on multi-diameter shaft 1；The right bearing 20 is set on the right side of right magnetism-isolating loop 18,
It is set on multi-diameter shaft 1.
Groove 21 is respectively equipped in the left pole shoe ring 3 and the periphery of right pole shoe ring 4, the groove 21 is equipped with close
Seal 22.
Claims (9)
1. a kind of novel staged device for sealing magnetic fluid, including multi-diameter shaft（1）, shell（2）, left pole shoe ring（3）, right pole shoe
Ring（4）, magnet ring I（5）, permanent magnet assembly ring, the multi-diameter shaft（1）It is set in shell（2）Within, it is characterised in that：
The multi-diameter shaft（1）Include the jackshaft of diameter maximum（101）The multigroup secondary axis being sequentially reduced with diameter, it is described
Secondary axis is along jackshaft（101）Side arrangement, with jackshaft（101）Intermediate radial section for demarcate it is symmetrical；
The jackshaft（101）Outer ring on be set with permanent magnet assembly ring, also cover on the outer ring of the permanent magnet assembly ring
Equipped with intermediate collar（6）；
The shell（2）Inner wall on corresponding intermediate collar（6）The position of periphery is provided with magnet ring I（5）, it is described
Magnet ring I（5）With intermediate collar（6）There are gaps between periphery；
The left pole shoe ring（3）, right pole shoe ring（4）It is respectively arranged on magnet ring I（5）Both sides, left pole shoe ring（3）, right pole shoe
Ring（4）Symmetrically；The left pole shoe ring（3）, right pole shoe ring（4）End face and anchor ring with respectively with intermediate collar（6）With
The periphery of secondary axis and end face are corresponding；The left pole shoe ring（3）, right pole shoe ring（4）Each end face on be respectively equipped with
The pole tooth I axially extended（7）, the pole tooth I（7）Jackshaft is corresponded to respectively（101）, intermediate collar（6）With secondary axis
End face, pole tooth I（7）With jackshaft（101）, intermediate collar（6）There are gap between the end face of secondary axis, magnetic fluid is set on should
In gap；The left pole shoe ring（3）, right pole shoe ring（4）Each inner ring surface on the periphery of corresponding secondary axis be provided with edge
The pole tooth II radially extended（8）, the pole tooth II（8）There are gap between the periphery of secondary axis, magnetic fluid is set on should
In gap.
2. novel staged device for sealing magnetic fluid as described in claim 1, it is characterised in that：The permanent magnet assembly
Ring is sleeved on jackshaft by interference fit（101）On；The intermediate collar（6）Set of permanent magnets is sleeved on by interference fit
On part ring.
3. novel staged device for sealing magnetic fluid as described in claim 1, it is characterised in that：The permanent magnet assembly
Ring includes the magnet ring II of same internal-and external diameter（9）And magnetic guiding loop（11）, the magnet ring II（9）It is described equipped with two groups
Magnetic guiding loop（11）Positioned at two groups of magnet ring II（9）Between.
4. novel staged device for sealing magnetic fluid as described in claim 1, it is characterised in that：The number of the secondary axis
It measures as 2-8 groups.
5. novel staged device for sealing magnetic fluid as described in claim 1, it is characterised in that：
The secondary axis includes two level axis（102）With three-level axis（103）, the jackshaft（101）The left and right sides difference
Set gradually two level axis（102）With three-level axis（103）, the jackshaft（101）, two level axis（102）, three-level axis（103）'s
Diameter is sequentially reduced；
The left pole shoe ring（3）With right pole shoe ring（4）On be respectively equipped with anchor ring I（12）, end face I（13）, anchor ring II
（14）, end face II（15）, anchor ring III（16）；
The anchor ring I（12）With three-level axis（103）Corresponding, the described anchor ring I of periphery（12）With three-level axis
（103）Between there are gaps；The anchor ring I（12）It is equipped with pole tooth II（8）；The pole tooth II（8）Radially to three
Grade axis（103）Periphery extension, with three-level axis（103）Periphery between there are gap, magnetic fluid is placed in the gap；
The end face I（13）With two level axis（102）Corresponding, the described anchor ring II in end face（14）With two level axis（102）
Periphery it is corresponding；The end face I（13）It is equipped with pole tooth I（7）；The pole tooth I（7）In an axial direction to two level axis
（102）End face extension, with two level axis（102）End face between there are gap, magnetic fluid is placed in the gap；
The anchor ring II（14）Two level axis（102）Periphery be equipped with pole tooth II（8）, the pole tooth II（8）Along diameter
To two level axis（102）Periphery extension, with two level axis（102）Periphery between there are gaps, magnetic fluid to be placed between this
In gap；
The end face II（15）With jackshaft（101）Corresponding, the described anchor ring III in end face（16）With jackshaft
（101）Periphery it is corresponding；The end face II（15）It is equipped with two groups of pole tooth I（7）, one of which pole tooth I（7）In an axial direction
To jackshaft（101）With magnet ring II（9）Intersection extension, pole tooth I（7）End face the corresponding jackshaft of a part
（101）End face, pole tooth I（7）Another part of end face correspond to magnet ring II（9）End face, pole tooth I（7）With jackshaft
（101）With magnet ring II（9）End face between there are gap, magnetic fluid is placed in the gap；Another set pole tooth I（7）Edge
Axially to intermediate collar（6）With magnet ring II（9）Intersection extension, pole tooth I（7）End face the corresponding permanent magnet of a part
Ring II（9）End face, pole tooth I（7）Another part of end face correspond to intermediate collar（6）End face, pole tooth I（7）With jackshaft
Ring（6）With magnet ring II（9）End face between there are gap, magnetic fluid is placed in the gap；The intermediate collar（6）'s
Periphery and anchor ring III（16）Between there are gaps.
6. the novel staged device for sealing magnetic fluid as described in claim 1 or 5, it is characterised in that：The pole tooth I
（7）, pole tooth II（8）Respectively by spaced 2-4 pole tooth groups into.
7. novel staged device for sealing magnetic fluid as described in claim 1, it is characterised in that：Further include left magnetism-isolating loop
（17）With right magnetism-isolating loop（18）；The left magnetism-isolating loop（17）Set on left pole shoe ring（3）Left side, be close to shell（2）Inner wall
Setting；The right magnetism-isolating loop（18）Set on right pole shoe ring（4）Left side, be close to shell（2）Inner wall setting.
8. novel staged device for sealing magnetic fluid as claimed in claim 7, it is characterised in that：Further include left bearing（19）
And right bearing（20）, the left bearing（19）Set on left magnetism-isolating loop（17）Left side, be set in multi-diameter shaft（1）On；Described
Right bearing（20）Set on right magnetism-isolating loop（18）Right side, be set in multi-diameter shaft（1）On.
9. novel staged device for sealing magnetic fluid as described in claim 1, it is characterised in that：The left pole shoe ring
（3）With right pole shoe ring（4）Periphery on be respectively equipped with groove（21）, the groove（21）Equipped with sealing ring（22）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721414451.5U CN207569209U (en) | 2017-10-30 | 2017-10-30 | A kind of novel staged device for sealing magnetic fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721414451.5U CN207569209U (en) | 2017-10-30 | 2017-10-30 | A kind of novel staged device for sealing magnetic fluid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207569209U true CN207569209U (en) | 2018-07-03 |
Family
ID=62693458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721414451.5U Expired - Fee Related CN207569209U (en) | 2017-10-30 | 2017-10-30 | A kind of novel staged device for sealing magnetic fluid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207569209U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107725785A (en) * | 2017-10-30 | 2018-02-23 | 广西科技大学 | A kind of new staged device for sealing magnetic fluid |
| CN113187897A (en) * | 2021-06-18 | 2021-07-30 | 北京交通大学 | Magnetic liquid seal and labyrinth seal combined sealing device |
-
2017
- 2017-10-30 CN CN201721414451.5U patent/CN207569209U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107725785A (en) * | 2017-10-30 | 2018-02-23 | 广西科技大学 | A kind of new staged device for sealing magnetic fluid |
| CN107725785B (en) * | 2017-10-30 | 2020-07-10 | 广西科技大学 | Novel stepped magnetic fluid sealing device |
| CN113187897A (en) * | 2021-06-18 | 2021-07-30 | 北京交通大学 | Magnetic liquid seal and labyrinth seal combined sealing device |
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180703 Termination date: 20191030 |
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| CF01 | Termination of patent right due to non-payment of annual fee |