CN209198526U - Facilitate the current transformer of operation - Google Patents
Facilitate the current transformer of operation Download PDFInfo
- Publication number
- CN209198526U CN209198526U CN201821953243.7U CN201821953243U CN209198526U CN 209198526 U CN209198526 U CN 209198526U CN 201821953243 U CN201821953243 U CN 201821953243U CN 209198526 U CN209198526 U CN 209198526U
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- Prior art keywords
- semi circular
- circular shells
- half ring
- shells
- connecting plate
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- 229920003023 plastic Polymers 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 2
- 238000004804 winding Methods 0.000 description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
- 238000001514 detection method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The utility model discloses a kind of current transformers for facilitating operation, it is related to the technical field of mutual inductor, the main points of its technical scheme are that: articulation piece includes articulated shaft and covers the torsional spring on articulated shaft, two feet of the torsional spring are fixed with the first semi circular shells and the second semi circular shells respectively, and the first drive rod and the second drive rod that the first semi circular shells of driving and the second semi circular shells rotate around the axis are respectively fixed in the first semi circular shells and the second semi circular shells.The utility model, which solves, opens and covers technical problem inconvenient for operation on conducting wire to be measured for the first semi circular shells and the second semi circular shells manually, has the advantages that facilitate by the first semi circular shells and the second semi-ring valve jacket on conducting wire to be measured.
Description
Technical field
The utility model relates to the technical field of mutual inductor, in particular to a kind of current transformer for facilitating operation.
Background technique
Current transformer be according to electromagnetic induction principle the high current in first winding is converted into it is small in secondary winding
Electric current is come the instrument that measures.Current transformer is made of the iron core and winding being closed.Its first side winding the number of turns is seldom, string
In the route for the electric current for needing to measure.
A kind of existing current transformer for facilitating operation referring to Fig.1, including the first half ring cores 10, is coated on the first semi-ring
The first semi circular shells 20 on core 10, the second half ring cores 11 that composition annulus is formed with the first half ring cores 10 and it is coated on the second half
The second semi circular shells 21 with the second semi circular shells 21 composition annulus on ring core 11, first semi circular shells 20 and the second semi circular shells
Be hinged with articulation piece 3 between 21, the first half ring cores 10 close to the both ends of the second half ring cores 11 offer respectively the first serrated slot with
And third serrated slot, the second half ring cores 11 offer the second sawtooth of the first serrated slot of cooperation close to the both ends of the first half ring cores 10
Slot and the 4th serrated slot for cooperating third serrated slot.
The conducting wire of circuit under test is passed through into the iron core that two and half ring cores form by two capable of hingedly facilitating for semi circular shells
Middle formation first winding, winding secondary winding, which can be realized not power off, on wherein one and half ring cores can be detected electricity in circuit
Stream, can be increased by the cooperation of the first serrated slot and the second serrated slot and the cooperation of third serrated slot and the 4th serrated slot
The tightness for adding the first half ring cores to connect with the second half ring cores, reduces current detection accuracy caused by poor contact between iron core
Influence.
The shortcomings of the prior art is: the first semi circular shells and the second semi circular shells being opened and covered manually
It is inconvenient for operation on conducting wire to be measured.
Utility model content
In view of the deficienciess of the prior art, the purpose of this utility model is that: it is mutual to provide a kind of electric current for facilitating operation
Sensor, what it had facilitates the advantage by the first semi circular shells and the second semi-ring valve jacket on conducting wire to be measured.
Above-mentioned technical purpose is achieved through the following technical solutions, a kind of current transformer facilitating operation, including the
Half ring core, the first semi circular shells being coated on the first half ring cores, the second half ring cores for forming with the first half ring cores composition annulus
And the second semi circular shells with the second semi circular shells composition annulus on the second half ring cores are coated on, first semi circular shells and the
It is hinged with articulation piece between two semi circular shells, the first half ring cores offer the first serrated slot and close to the both ends of the second half ring cores
Three serrated slots, the second half ring cores offer the second serrated slot of the first serrated slot of cooperation close to the both ends of the first half ring cores and match
The 4th serrated slot of third office serrated slot is closed, the articulation piece includes articulated shaft and covers the torsional spring on articulated shaft, the torsion
Two feet of spring are fixed with the first semi circular shells and the second semi circular shells respectively, solid respectively in the first semi circular shells and the second semi circular shells
Surely the first drive rod and the second drive rod for thering are the first semi circular shells of driving and the second semi circular shells to rotate around the axis.
Through the above technical solutions, the conducting wire of circuit under test is passed through two by two capable of hingedly facilitating for semi circular shells
First winding is formed in the iron core of half ring core composition, secondary winding is wound on one and half ring cores wherein can be realized and do not power off i.e.
Electric current in detectable circuit, passes through the cooperation of the first serrated slot and the second serrated slot and third serrated slot and the 4th sawtooth
The cooperation of slot can increase the tightness that the first half ring cores are connect with the second half ring cores, reduce poor contact between iron core and cause
The influence of current detection accuracy pushed away by the first drive rod, the setting of the first rotating bar, the second drive rod, the second rotating bar
Dynamic first rotating bar and the second rotating bar make the first rotating bar and the second rotating bar is close to each other can make the first semi circular shells
And second semi circular shells be located remotely from each other far from one end of torsional spring, pass through for conducting wire to be measured, unclamp the first rotating bar and second rotation
Bar can drive the first semi circular shells and the second semi circular shells close to each other and mutually abut, in use, only by the elastic force of torsional spring
Hand-held first rotation and the second rotating bar are needed, allows the first semi circular shells and the second semi circular shells far from one end of torsional spring close to be measured
The conducting wire of amount, and the first rotating bar and the second rotating bar are rotated, by wire sleeve in the first semi circular shells and the second semi circular shells,
It is easy to operate, even with respect to narrow space, as long as in the space that the first semi circular shells and the second semi circular shells can extend into
Conducting wire to be measured can be inserted in, it is easy to operate.
Further, first drive rod one end is fixed in the first semi circular shells, and the other end is rotatably connected on articulated shaft
On, second drive rod one end is fixed in the second semi circular shells, and the other end is rotatably connected on articulated shaft, and the first drive rod is close to hinge
Spindle one end is fixedly connected with the first rotating bar, and the second drive rod is fixedly connected with the second rotating bar close to articulated shaft one end, the
One rotating bar is located at torsional spring away from the second semi circular shells side far from first drive rod one end, and the second rotating bar is far from the second drive rod
One end is located at torsional spring away from the first semi circular shells side.
Through the above technical solutions, the first driving can be made by the first rotating bar close to each other and the second rotating bar
Bar and the second drive rod are located remotely from each other, and then make the separate one end of torsional spring of the first semi circular shells and the second semi circular shells mutually remote
From, by wire sleeve in the first semi circular shells and the second semi circular shells, rotating bar is unclamped, by conducting wire lock in annular outer cover, first
It is simple to operate in semi circular shells and the second semi circular shells.
Further, the articulation piece includes the first connection ring being fixed in the first semi circular shells, is fixed on the second semi-ring
The second connection ring on shell and the articulated shaft across the first connection ring and the second connection ring.
Through the above technical solutions, can be realized the first semi circular shells and second by the cooperation of articulated shaft and connection ring
Hinged, the folding that the current transformer core of easy to operate operation can be facilitated by rotating two semi circular shells of semi circular shells, side
Just on the conducting wire by the iron core sleeve formed there are two half ring core in circuit under test, allow the conducting wire formed the number of turns be one it is primary around
Group, the convenient measurement to the circuital current.
Further, the first semi circular shells are fixedly connected with the first connecting plate far from articulation piece one end, and the second semi circular shells are separate
Articulation piece one end is fixedly connected with the second connecting plate, is bolted between the first connecting plate and the second connecting plate.
Through the above technical solutions, two semi circular shells can be clamped by the setting of two connecting plates and bolt, the is allowed
The power abutted between half ring core and the second half ring cores is bigger, and the connection between the first half ring cores and the second half ring cores is allowed more to step up
It is close, it reduces as caused by poor contact to the influence of current detection accuracy.
Further, the first connecting plate offers the first clamping groove far from articulation piece a side, and the second connecting plate is far from hinge
Fitting a side offers the second clamping groove.
Through the above technical solutions, the screw rod of bolt is directly caught in clamping groove by clamping groove, inserted relative to by screw rod
Enter in the hole on connecting plate operate it is more convenient, need not be aligned hole, it is convenient and efficient.
Further, circular first card slot, the first card are offered far from the second connecting plate one side on the first connecting plate
The aperture of slot is greater than the width of the first clamping groove, and the second connecting plate is far from offering circular second on the first connecting plate one side
Card slot, the second card slot internal diameter are greater than the width of the second clamping groove.
Through the above technical solutions, the nut of bolt is embedded in the first card slot, nut is embedded in the second card slot, can be limited
Bolt is detached from from clamping groove, increases the stability of connection.
Further, first semi circular shells and the second semi circular shells are semi circular shells made of plastics.
Through the above technical solutions, the electric conductivity of plastics is poor, circuit can be protected, reduce the possibility of electric leakage.
Further, the articulation piece is articulation piece made of plastics.
Through the above technical solutions, the electric conductivity of plastics is poor, the possibility of electric leakage can be reduced.
Further, the first half ring cores are Nian Jie by glue with the first semi circular shells, and the second half ring cores and the second semi circular shells are led to
Cross glue bonding.
Through the above technical solutions, being passed through after secondary winding will be wound on the second half ring cores by glue and the second semi circular shells
Glue bonding, can allow between iron core and shell and connect more well.
The utility model has following technical effect that in summary
1, the conducting wire of circuit under test is passed through into the iron that two and half ring cores form by two capable of hingedly facilitating for semi circular shells
First winding is formed in core, winding secondary winding, which can be realized not power off, on wherein one and half ring cores can be detected electricity in circuit
Stream, can be increased by the cooperation of the first serrated slot and the second serrated slot and the cooperation of third serrated slot and the 4th serrated slot
The tightness for adding the first half ring cores to connect with the second half ring cores, reduces current detection accuracy caused by poor contact between iron core
Influence；
2, contact area is increased by serrated slot, while by connector by the end abutment of two and half ring cores, allows two
The contact of half ring core is more intact.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the existing current transformer for facilitating operation；
Fig. 2 is the structural schematic diagram of embodiment 1；
Fig. 3 is the portion the A enlarged drawing in Fig. 2；
Fig. 4 is cross-sectional view of the Fig. 2 along line A-A；
Fig. 5 is the portion the B enlarged drawing in Fig. 4；
Fig. 6 is the portion the C enlarged drawing in Fig. 5；
Fig. 7 is the structural schematic diagram of embodiment 2；
Fig. 8 is the portion the D enlarged drawing in Fig. 7.
Appended drawing reference: 1, annular core；10, the first half ring cores；100, the first protrusion；101, third protrusion；102, first
Serrated slot；103, third serrated slot；11, the second half ring cores；110, the second protrusion；111, the 4th protrusion；112, the second serrated slot；
113, the 4th serrated slot；2, annular outer cover；20, the first semi circular shells；21, the second semi circular shells；3, articulation piece；30, the first connection ring；
32, articulated shaft；33, torsional spring；4, connector；40, the first connecting plate；41, the second connecting plate；42, the first clamping groove；43, second
Clamping groove；44, the first card slot；45, the second card slot；5, bolt；50, screw rod；51, nut；52, nut；6, secondary winding；7,
One drive rod；70, the first rotating bar；8, the second drive rod；80, the second rotating bar.
Specific embodiment
Embodiment 1, referring to Fig. 2, Fig. 4, a kind of current transformer facilitating operation includes annular core 1 and is coated on ring
The annular outer cover 2 in the outside of shape iron core 1, annular core 1 include that the first half ring cores 10 and the second half ring cores 11, annular outer cover 2 wrap
Including the first semi circular shells 20 and the second semi circular shells 21, the first half ring cores 10 are located in the first semi circular shells 20, and the second half ring core 11
In in the second semi circular shells 21, the first semi circular shells 20 and 21 one end of the second semi circular shells are fixedly connected with for making the first semi circular shells 20
And the second hinged articulation piece 3 of semi circular shells 21.
Articulation piece 3 includes the first connection ring 30 for being fixedly connected on 20 one end of the first semi circular shells, is fixedly connected on the second half
The second connection ring (not shown) on toroidal shell 21 and pass through the first connection ring 30 and the second connection ring (not shown)
Articulated shaft 32.
In conjunction with fig. 4 to fig. 6, the first half ring cores 10 are extended with the first protrusion to the second half ring cores 11 close to 3 one end of articulation piece
100, the second half ring cores 11 are extended with the second protrusion 110, the first protrusion to the first half 10 sides of ring core close to 3 one end of articulation piece
100 offer the first serrated slot 102 on the second raised 110 one sides, and the second protrusion 110 is close to the first raised 100 sides
Face offers the second sawtooth stupefied 112 with the cooperation of the first serrated slot 102.The protrusion of second sawtooth stupefied 112 the first sawtooth of stupefied alignment
The recess of slot 102 is stupefied.
The first half ring cores 10 are extended with third protrusion 101, third protrusion to the second half ring cores 11 far from 3 one end of articulation piece
Offer third sawtooth stupefied 103 identical with the first serrated slot 102 on 101, the second half ring cores 11 are far from 3 one end of articulation piece to
4 half ring cores are extended with the 4th protrusion 111, and it is stupefied that the 4th sawtooth identical with the second sawtooth stupefied 112 is offered in the 4th protrusion 111
113, the recess of protrusion the 4th sawtooth stupefied 113 of stupefied alignment of third sawtooth stupefied 103 is stupefied.
In conjunction with Fig. 2, the first semi circular shells 20 are fixedly connected with the first connecting plate 40, the second semi circular shells far from 3 one end of articulation piece
21 are fixedly connected with the second connecting plate 41, common shape between the first connecting plate 40 and the second connecting plate 41 far from 3 one end of articulation piece
At connector 4.
In conjunction with Fig. 3, Fig. 6, the first connecting plate 40 offers the first clamping groove 42, the second connection far from 3 a side of articulation piece
Plate 41 offers the second clamping groove 43, separate second connecting plate, 41 one side on the first connecting plate 40 far from 3 a side of articulation piece
Circular first card slot 44 is offered, the aperture of the first card slot 44 is greater than the width of the first clamping groove 42, and the second connecting plate 41 is remote
From circular second card slot 45 is offered on 40 one side of the first connecting plate, 45 internal diameter of the second card slot is greater than the second clamping groove 43
Width.
Referring to Fig. 4, it is provided with across the first card slot 44, the first clamping groove 42, the second clamping groove 43 and the second card slot 45
The nut 52 of bolt 5, bolt 5 is embedded in the first card slot 44, and nut 51 is embedded in the second card slot 45, and screw rod 50 is located at the first clamping
In slot 42 and the second clamping groove 43.By the locking of bolt 5, the first half ring cores 10 and the second half ring cores 11 can be allowed far from hinge
The fitting of 3 one end of fitting is capable of increasing contact area by jagged surface, and the first half ring cores 10 and the second half ring cores 11 connect
It connects more intact.
Specific implementation process is wound with secondary winding 6 on the first half ring cores 10, and conducting wire to be measured is passed through by the first half
In the annular core 1 that ring core 10, the second half ring cores 11 form, conducting wire to be measured forms the number of turns and is one first winding, and then passes through
It detects the electric current of secondary winding 6 and detects the electric current in circuit under test.
Embodiment 2, the present embodiment difference from example 1 is that: referring to Fig. 7, Fig. 8, be cased with torsion on articulated shaft 32
Two feet of spring 33, torsional spring 33 are separately fixed in the first connection ring 30 and the second connection ring, fixed in the first semi circular shells 20
It is connected with the first drive rod 7,7 one end of the first drive rod is rotatably connected on articulated shaft 32, and the other end is fixedly connected on the first half
On toroidal shell 20, the second drive rod 8 is fixedly connected in the second semi circular shells 21, second fixed link one end is fixed on the second semi circular shells 21
The upper other end is rotatably connected on articulated shaft 32, and the first drive rod 7 is connected with first turn far from 20 one end of the first semi circular shells
Lever 70, the first rotating bar 70 and the mutual angle in 90 ° of the first drive rod 7, the second drive rod 8 is far from 21 one end one of the second semi circular shells
Body is connected with the second rotating bar 80, the second rotating bar 80 and the mutual angle in 90 ° of the first rotating bar 70.First rotating bar 70 is far from
One drive rod, 7 one end is located at separate second semi circular shells, 21 side of articulated shaft 32, and the second rotating bar 80 is far from the second drive rod 8 one
End is located at separate first semi circular shells, 20 side of articulated shaft 32.
Specific implementation process, the first rotating bar 70 close to each other and the second rotating bar 80, are able to drive the first drive rod 7
It is located remotely from each other far from 70 one end of the first rotating bar and the second drive rod 8 far from 80 one end of the second rotating bar, and then drives first
Semi circular shells 20 and the second semi circular shells 21 are rotated around articulated shaft 32, the first semi circular shells 20 and the second semi circular shells 21 far from hinged
32 one end of axis is located remotely from each other, and conducting wire to be detected is protruded into from the gap of two semi circular shells, unclamps rotating bar, the drive of torsional spring 33
It allows the first semi circular shells 20 and the second semi circular shells 21 close to each other up to fitting far from 33 one end of torsional spring under dynamic, to be measured is led
Line is locked in the first semi circular shells 20 and the second semi circular shells 21, and the electric current by measuring secondary winding 6 is able to detect that electricity to be measured
Electric current in road, it is simple to operate.
This specific embodiment is only the explanation to the utility model, is not limitations of the present invention, ability
Field technique personnel can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but
As long as all by the protection of Patent Law in the scope of the claims of the utility model.
Claims (9)
1. a kind of current transformer for facilitating operation, including the first half ring cores (10), be coated on the first half ring cores (10)
One semi circular shells (20), the second half ring cores (11) that composition annulus is formed with the first half ring cores (10) and it is coated on the second half ring cores
(11) the second semi circular shells (21) with the second semi circular shells (21) composition annulus on, first semi circular shells (20) and the second half
It is hinged between toroidal shell (21) articulation piece (3), the first half ring cores (10) offer respectively close to the both ends of the second half ring cores (11)
First serrated slot (102) and third serrated slot (103), the second half ring cores (11) are opened up close to the both ends of the first half ring cores (10)
There is the second serrated slot (112) of cooperation the first serrated slot (102) and cooperates the 4th serrated slot of third serrated slot (103)
(113), it is characterised in that: the articulation piece (3) includes articulated shaft (32) and covers the torsional spring (33) on articulated shaft (32), institute
It is fixed with the first semi circular shells (20) and the second semi circular shells (21) respectively to state two feet of torsional spring (33), the first semi circular shells (20) with
And second be respectively fixed with driving the first semi circular shells (20) in semi circular shells (21) and the second semi circular shells (21) rotate around the axis
First drive rod (7) and the second drive rod (8).
2. the current transformer according to claim 1 for facilitating operation, it is characterised in that: first drive rod (7) one
End is fixed on the first semi circular shells (20), and the other end is rotatably connected on articulated shaft (32), and the second drive rod (8) one end is fixed on
In second semi circular shells (21), the other end is rotatably connected on articulated shaft (32), and the first drive rod (7) is close to articulated shaft (32) one end
It is fixedly connected with the first rotating bar (70), the second drive rod (8) is fixedly connected with the second rotating bar close to articulated shaft (32) one end
(80), the first rotating bar (70) is located at torsional spring (33) far from the first drive rod (7) one end and deviates from the second semi circular shells (21) side, the
Two rotating bars (80) are located at torsional spring (33) away from the first semi circular shells (20) side far from the second drive rod (8) one end.
3. the current transformer according to claim 1 for facilitating operation, it is characterised in that: the articulation piece (3) includes solid
It the first connection ring (30) for being scheduled on the first semi circular shells (20), the second connection ring being fixed on the second semi circular shells (21) and wears
Cross the articulated shaft (32) of the first connection ring (30) and the second connection ring.
4. the current transformer according to claim 3 for facilitating operation, it is characterised in that: the first semi circular shells (20) are far from hinge
Fitting (3) one end is fixedly connected with the first connecting plate (40), and the second semi circular shells (21) are fixedly connected with far from articulation piece (3) one end
Second connecting plate (41), it is fixed by bolt (5) between the first connecting plate (40) and the second connecting plate (41).
5. the current transformer according to claim 4 for facilitating operation, it is characterised in that: the first connecting plate (40) is far from hinge
Fitting (3) a side offers the first clamping groove (42), and the second connecting plate (41) offers second far from articulation piece (3) a side
Clamping groove (43).
6. the current transformer according to claim 5 for facilitating operation, it is characterised in that: separate on the first connecting plate (40)
Second connecting plate (41) one side offers circular first card slot (44), and the aperture of the first card slot (44) is greater than the first clamping groove
(42) width, the second connecting plate (41) far from offering circular second card slot (45) on the first connecting plate (40) one side,
Second card slot (45) internal diameter is greater than the width of the second clamping groove (43).
7. the current transformer according to claim 1 for facilitating operation, it is characterised in that: first semi circular shells (20) with
And second semi circular shells (21) be semi circular shells made of plastics.
8. the current transformer according to claim 1 for facilitating operation, it is characterised in that: the articulation piece (3) is plastics
Manufactured articulation piece (3).
9. the current transformer according to claim 1 for facilitating operation, it is characterised in that: the first half ring cores (10) and first
Semi circular shells (20) are bonded by glue, and it is Nian Jie that the second half ring cores (11) with the second semi circular shells (21) pass through glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821953243.7U CN209198526U (en) | 2018-11-24 | 2018-11-24 | Facilitate the current transformer of operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821953243.7U CN209198526U (en) | 2018-11-24 | 2018-11-24 | Facilitate the current transformer of operation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209198526U true CN209198526U (en) | 2019-08-02 |
Family
ID=67425965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821953243.7U Expired - Fee Related CN209198526U (en) | 2018-11-24 | 2018-11-24 | Facilitate the current transformer of operation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209198526U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114388202A (en) * | 2021-12-09 | 2022-04-22 | 江苏南瑞帕威尔电气有限公司 | Drainage ring with self-locking function |
-
2018
- 2018-11-24 CN CN201821953243.7U patent/CN209198526U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114388202A (en) * | 2021-12-09 | 2022-04-22 | 江苏南瑞帕威尔电气有限公司 | Drainage ring with self-locking function |
| CN114388202B (en) * | 2021-12-09 | 2024-01-23 | 江苏南瑞帕威尔电气有限公司 | Drainage ring with self-locking function |
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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: 20190802 |
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| CF01 | Termination of patent right due to non-payment of annual fee |