CN114094356A - Device and method for installing sewage monitoring drainage ring and drainage ring at ground potential - Google Patents

Device and method for installing sewage monitoring drainage ring and drainage ring at ground potential Download PDF

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Publication number
CN114094356A
CN114094356A CN202111526466.1A CN202111526466A CN114094356A CN 114094356 A CN114094356 A CN 114094356A CN 202111526466 A CN202111526466 A CN 202111526466A CN 114094356 A CN114094356 A CN 114094356A
Authority
CN
China
Prior art keywords
ring
gear
gear shaft
drainage
semi
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.)
Pending
Application number
CN202111526466.1A
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Chinese (zh)
Inventor
郑为凑
林福
王涛
陈海燕
郑烨
罗莹莹
马威威
陈言团
周统明
张自忠
江君鑫
傅友忠
陈进文
吴锦清
刘积丁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Fujian Electric Power Co Ltd
Ningde Power Supply Co of State Grid Fujian Electric Power Co Ltd
Original Assignee
State Grid Fujian Electric Power Co Ltd
Ningde Power Supply Co of State Grid Fujian Electric Power Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by State Grid Fujian Electric Power Co Ltd, Ningde Power Supply Co of State Grid Fujian Electric Power Co Ltd filed Critical State Grid Fujian Electric Power Co Ltd
Priority to CN202111526466.1A priority Critical patent/CN114094356A/en
Publication of CN114094356A publication Critical patent/CN114094356A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00Insulators or insulating bodies characterised by their form
    • H01B17/38Fittings, e.g. caps; Fastenings therefor
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00Insulators or insulating bodies characterised by their form
    • H01B17/42Means for obtaining improved distribution of voltage; Protection against arc discharges
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/66Connections with the terrestrial mass, e.g. earth plate, earth pin

Abstract

The invention discloses a drain ring and drain ring ground potential installation device for monitoring pollution and an installation method thereof, wherein the drain ring ground potential installation device comprises a gear frame, a gear shaft A, a gear shaft B, a drain ring fixing rod, a bevel pinion and a bevel bull gear, wherein the bevel pinion and the bevel bull gear are arranged in the gear frame; the big bevel gear and the small bevel gear are mutually meshed to complete right-angle transmission; one end of the gear shaft A is fixedly connected with the small bevel gear, and the other end of the gear shaft A penetrates through the gear frame to be connected with one end of a universal joint shaft through a universal joint; one end of the gear shaft B is fixedly connected with the big bevel gear, and the other end of the gear shaft B penetrates through the gear frame and is fixedly connected with a rectangular-back clamping block; the drainage ring fixing rod is sleeved outside the gear shaft A and the cylindrical ring boss, and one end, close to the gear shaft A, of the drainage ring fixing rod is fixedly connected with a rectangular frame; the character returning frame is matched with the square boss.

Description

Device and method for installing sewage monitoring drainage ring and drainage ring at ground potential
Technical Field
The invention belongs to the technical field of installation devices, and particularly relates to a device and a method for installing a sewage monitoring drainage ring and a drainage ring at ground potential.
Background
The pollution flashover problem always threatens the safe and stable operation of a power system, and the traditional method for regularly cleaning the line wastes time and labor and cannot detect the pollution flashover problem in real time. The intelligent pollution monitoring and early warning system is used for monitoring the pollution state of the insulator in real time, and whether the insulator needs to be cleaned or not is judged according to monitoring data, so that unnecessary cleaning is reduced, and the efficiency is improved. The intelligent pollution monitoring and early warning system needs to install a drainage ring on a high-voltage insulator and is used for collecting pollution flashover voltage of the monitored insulator.
The existing drainage ring is manually close to the high-voltage insulator and is manually installed, so that the safety of installation personnel is greatly threatened. Therefore, the device capable of remotely installing the drainage ring is designed, the safety of installation personnel is guaranteed, and the installation convenience is improved.
A certain distance is reserved between the high-voltage insulator and the iron tower, and a ground potential mounting device is designed for facilitating the mounting of the current-guiding ring.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a device and a method for mounting the ground potential of a sewage monitoring drainage ring and a drainage ring, so as to solve the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a pollution monitoring drainage ring which comprises a fixed semi-ring and a rotating semi-ring, wherein one end of the fixed semi-ring is connected with one end of the rotating semi-ring through a bolt; the other end of the fixed semi-ring is provided with a semi-ring groove, and a pressure spring clip is arranged on the semi-ring groove; the other end of the rotating semi-ring is provided with a semi-ring clamping block, and a sawtooth clamping groove is formed in the semi-ring clamping block; a rectangular-back groove is formed in the upper surface of the rotating semi-ring and is coaxial with the bolt.
Furthermore, a square boss is arranged on the fixed semi-ring.
The invention also discloses a sewage monitoring drainage ring ground potential installation device, which comprises a gear frame, a gear shaft A, a gear shaft B, a drainage ring fixing rod, a small bevel gear and a large bevel gear, wherein the small bevel gear and the large bevel gear are arranged in the gear frame; the big bevel gear and the small bevel gear are mutually meshed to complete right-angle transmission; one end of the gear shaft A is fixedly connected with the small bevel gear, and the other end of the gear shaft A penetrates through the gear frame to be connected with one end of a universal joint shaft through a universal joint; one end of the gear shaft B is fixedly connected with the big bevel gear, and the other end of the gear shaft B penetrates through the gear frame and is fixedly connected with a rectangular-back clamping block; the drainage ring fixing rod is sleeved outside the gear shaft A and the cylindrical ring boss, and one end, close to the gear shaft A, of the drainage ring fixing rod is fixedly connected with a rectangular frame; the character returning frame is matched with the square boss.
Furthermore, the gear shaft A penetrates through the inner part of the cylindrical ring boss.
Furthermore, the gear shaft A is provided with an installation limiting hole, and the universal joint shaft is provided with a disassembly limiting hole.
Furthermore, the gear shaft A and the middle section of the drainage ring fixing rod are made of insulating materials.
Furthermore, a limiting bulge is arranged on the cylindrical ring boss, a sliding rail is arranged in the drainage ring fixing rod, and the limiting bulge is matched with the sliding rail for use, so that the drainage ring fixing rod can only move back and forth in the axial direction.
Furthermore, the word returning frame is fixed on the drainage ring fixing rod through a fixing connecting rod.
Furthermore, the other end of the universal joint shaft is connected with the crank through a universal joint.
The invention also comprises a method for installing the ground potential of the sewage monitoring drainage loop, which comprises the following steps:
step S1, clamping the clip into the clip groove of the rotary semi-ring; pushing out the drainage ring fixing rod to clamp the square boss of the fixed semi-ring; clamping the B-shaped pin in the mounting limiting hole of the gear shaft A;
step S2, changing the position relation of the gear shaft A, the universal joint shaft and the crank into a Z-shaped crank shape;
step S3, rotating the universal joint shaft, driving a big bevel gear to transmit through a small bevel gear, enabling a gear shaft B to rotate anticlockwise, and driving a rotating half ring to rotate anticlockwise until the rotating half ring and a fixed half ring form a drainage ring;
step S4, after the rotating half ring rotates anticlockwise and the fixed half ring is closed, the pressure spring clamp clamps the sawtooth clamping groove of the rotating half ring;
step S5 of changing the positional relationship among the gear shaft a, the universal joint shaft, and the crank from a zigzag crank shape to a linear shape; pulling out the B-shaped pin from the mounting limiting hole, and inserting the B-shaped pin into the dismounting limiting hole; pulling back the diversion ring fixing rod to separate the square boss from the square frame; and lifting the drainage ring ground potential installation device upwards to separate the clip-shaped fixture block from the clip-shaped groove, and withdrawing the drainage ring ground potential installation device from working.
The invention has the beneficial effects that:
1. the device is used for installing a drainage ring and collecting data for an intelligent pollution detection early warning system; the ground potential installation is realized, and the installation convenience is improved.
2. The drainage ring fixing device does not need to fixedly install connecting pieces such as bolts and the like, can ensure the fixed installation between the device and the drainage ring, and is convenient to disassemble after the installation of the drainage ring is finished; insulating materials are selected for the drainage ring fixing rod and the middle section of the gear shaft A, and the drainage ring fixing rod and the middle section of the gear shaft A can be installed in an electrified mode, so that the safety of operators is guaranteed.
3. The device and the method for installing the ground potential of the pollution monitoring drainage ring are designed, self-locking and remote installation can be realized, manual intervention is saved, and the device and the method are safe and convenient.
Drawings
FIG. 1 is a schematic structural view of an unclosed loop of a pollution monitoring drainage loop according to the present invention;
FIG. 2 is a schematic structural diagram of a closed loop of a pollution monitoring drainage loop according to the present invention;
FIG. 3 is a schematic view of an overall structure of a device for installing the ground potential of a pollution monitoring and drainage ring;
FIG. 4 is a front view of the overall structure of the drain ring ground potential mounting device for pollution monitoring according to the present invention;
FIG. 5 is a top view of the overall structure of the device for installing the ground potential of the pollution monitoring drainage ring according to the present invention;
FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5;
FIG. 7 is a schematic structural view of the clip block inserted into the clip groove in step S1 when the current guiding ring is connected to the mounting device according to the present invention;
FIG. 8 is a schematic structural view of the drainage ring of the present invention, when connected to a mounting device, the drainage ring fixing rod is moved forward, and the frame is fixed on the square boss;
FIG. 9 is a schematic structural view of the drainage ring and the mounting device of the present invention when the B-pin is moved from the mounting hole to the dismounting hole.
FIG. 10 is a schematic structural view of the flow guiding ring and the mounting device when the frame is separated from the square boss;
FIG. 11 is a schematic structural view of the present invention after the completion of the installation of the diffuser ring and the withdrawal of the installation apparatus;
fig. 12 is a schematic structural view showing a state in which the positional relationship among the gear shaft a, the universal joint shaft, and the crank is changed to a zigzag crank shape in the present invention.
Reference numbers in the figures:
1. a gear frame; 1-1, cylindrical ring boss; 1-2, limiting bulges; 2. a gear shaft B; 2-1, a clip block shaped like a Chinese character 'hui'; 3. a large bevel gear; 4. a bevel pinion gear; 5. a gear shaft A; 5-1, installing a limiting hole; 6. a drainage ring fixing rod; 6-1, a frame with a character of 'Hui'; 6-2, fixing a connecting rod; 7. a B-shaped pin; 8. a universal joint shaft; 8-1, disassembling the limiting hole; 9. a crank; 10. rotating the semi-ring; 11-2, semi-ring grooves; 10-1, a groove shaped like a Chinese character 'hui'; 10-2, a sawtooth clamping groove; 10-3, semi-ring clamping blocks; 11. a stationary half ring; 11-1, square bosses; 12. a pressure spring clip; 13. and (4) bolts.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 1-a, the pollution monitoring drainage ring of the present embodiment includes a stationary half ring 11 and a rotating half ring 10, wherein one end of the stationary half ring 11 is connected with one end of the rotating half ring 10 through a bolt 13; the other end of the fixed semi-ring 11 is provided with a semi-ring groove 11-2, and a pressure spring clip 12 is arranged on the semi-ring groove 11-2; the other end of the rotating semi-ring 10 is provided with a semi-ring clamping block 10-3, and the semi-ring clamping block 10-3 is provided with a sawtooth clamping groove 10-2; a reversed-square groove 10-1 is formed on the upper surface of the rotary half ring 10 at a position coaxial with the bolt 13.
In the sewage monitoring drainage ring of the embodiment, the fixed half ring 11 is provided with a square boss 11-1.
The dirt monitoring drainage ring ground potential installation device comprises a gear frame 1, a gear shaft A5, a gear shaft B2, a drainage ring fixing rod 6, a bevel pinion 4 and a bevel pinion 3, wherein the bevel pinion 4 and the bevel pinion 3 are arranged in the gear frame 1; the big bevel gear 3 and the small bevel gear 4 are mutually meshed to complete right-angle transmission; one end of a gear shaft A5 is fixedly connected with the bevel pinion 4, and the other end of the gear shaft A5 passes through the gear frame 1 and is connected with one end of a universal joint shaft 8 by a universal joint; the gear shaft A5 and the gear frame 1 are rotatable; one end of a gear shaft B2 is fixedly connected with the big bevel gear 3, and the other end of the gear shaft B2 passes through the gear frame 1 to be fixedly connected with a rectangular-back fixture block 2-1; the gear shaft B2 and the gear frame 1 are also rotatable; the drainage ring fixing rod 6 is sleeved outside the gear shaft A5 and the cylindrical ring boss 1-1, and one end, close to the gear shaft A5, of the drainage ring fixing rod 6 is fixedly connected with a rectangular frame 6-1; the square boss 11-1 is matched with the square frame 6-1.
Furthermore, the gear shaft A5 penetrates through the inner part of the cylindrical ring boss 1-1.
Furthermore, the gear shaft A5 is provided with an installation limiting hole 5-1, and the universal joint shaft 8 is provided with a disassembly limiting hole 8-1.
Furthermore, the middle sections of the gear shaft A5 and the drainage ring fixing rod 6 are made of insulating materials.
Furthermore, a limiting bulge 1-2 is arranged on the cylindrical ring boss 1-1, a sliding rail (not shown in the figure) is arranged in the drainage ring fixing rod 6, and the limiting bulge 1-2 is matched with the sliding rail, so that the drainage ring fixing rod 6 can only move back and forth in the axial direction.
Further, the square frame 6-1 is fixed on the drainage ring fixing rod 6 through a fixing connecting rod 6-2.
Further, the other end of the universal joint shaft 8 is connected with the crank 9 by a universal joint.
The method for installing the ground potential of the pollution monitoring diversion ring comprises the following steps:
step S1, clamping the clip 2-1 into the clip groove 10-1 of the rotary half ring 10; pushing out the drainage ring fixing rod 6 to enable the square boss 11-1 of the fixed semi-ring 11 to be clamped by the square frame 6-1; the B-shaped pin 7 is clamped in the mounting limiting hole 5-1 of the gear shaft A5;
step S2, changing the position relation of the gear shaft A5, the universal joint shaft 8 and the crank 9 into a Z-shaped crank shape;
step S3, rotating the universal joint shaft 8, driving the big bevel gear 3 to transmit through the small bevel gear 4, enabling the gear shaft B2 to rotate anticlockwise, and driving the rotating half ring 10 to rotate anticlockwise until forming a drainage ring with the fixed half ring 11;
step S4, after the rotating half ring 10 rotates anticlockwise and is closed with the fixed half ring 11, the sawtooth clamping groove 10-2 of the rotating half ring 10 is clamped by the pressure spring clamp 12;
step S5, changing the position relation of the gear shaft A5, the universal joint shaft 8 and the crank 9 from a Z-shaped crank shape to a straight shape; the B-shaped pin 7 is pulled out of the mounting limit hole 5-1 and inserted into the dismounting limit hole 8-1; the drainage ring fixing rod 6 is pulled back, so that the square boss 11-1 is separated from the square frame 6-1; and lifting the drainage ring ground potential installation device upwards to separate the clip-shaped block 2-1 from the clip-shaped groove 10-1, completing the installation of the drainage ring, and withdrawing the drainage ring ground potential installation device.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention.

Claims (10)

1. A filth monitoring drainage ring is characterized in that: the semi-ring structure comprises a fixed semi-ring (11) and a rotating semi-ring (10), wherein one end of the fixed semi-ring (11) is connected with one end of the rotating semi-ring (10) through a bolt (13); a semi-ring groove (11-2) is formed in the other end of the fixed semi-ring (11), and a pressure spring clip (12) is arranged on the semi-ring groove (11-2); a semi-ring clamping block (10-3) is arranged at the other end of the rotating semi-ring (10), and a sawtooth clamping groove (10-2) is formed in the semi-ring clamping block (10-3); a rectangular-shaped groove (10-1) is formed in the position, coaxial with the bolt (13), of the upper surface of the rotating half ring (10).
2. The pollution monitoring diversion ring of claim 1, wherein: the fixed half ring (11) is provided with a square boss (11-1).
3. The utility model provides a filth monitoring drainage ring ground potential installation device which characterized in that: the drainage ring fixing device comprises a gear frame (1), a gear shaft A (5), a gear shaft B (2), a drainage ring fixing rod (6), a small bevel gear (4) and a large bevel gear (3) which are arranged in the gear frame (1); the big bevel gear (3) and the small bevel gear (4) are mutually meshed to complete right-angle transmission; one end of the gear shaft A (5) is fixedly connected with the small bevel gear (4), and the other end of the gear shaft A penetrates through the gear frame (1) to be connected with one end of a universal joint shaft (8) through a universal joint; one end of the gear shaft B (2) is fixedly connected with the big bevel gear (3), and the other end of the gear shaft B passes through the gear frame (1) and is fixedly connected with a rectangular-shaped clamping block (2-1); the drainage ring fixing rod (6) is sleeved outside the gear shaft A (5) and the cylindrical ring boss (1-1), and one end, close to the gear shaft A (5), of the drainage ring fixing rod (6) is fixedly connected with a rectangular frame (6-1); the character returning frame (6-1) is matched with the square boss (11-1).
4. The pollution monitoring drainage ring ground potential installation device according to claim 3, characterized in that: the gear shaft A (5) penetrates through the inner part of the cylindrical ring boss (1-1).
5. The pollution monitoring drainage ring ground potential installation device according to claim 3, characterized in that: the gear shaft A (5) is provided with an installation limiting hole (5-1), and the universal joint shaft (8) is provided with a disassembly limiting hole (8-1).
6. The pollution monitoring drainage ring ground potential installation device according to claim 3, characterized in that: the middle sections of the gear shaft A (5) and the drainage ring fixing rod (6) are made of insulating materials.
7. The pollution monitoring drainage ring ground potential installation device according to claim 4, wherein: the cylindrical ring boss (1-1) is provided with a limiting bulge (1-2), the drainage ring fixing rod (6) is internally provided with a sliding rail, and the limiting bulge (1-2) is matched with the sliding rail, so that the drainage ring fixing rod (6) can only axially move back and forth.
8. The pollution monitoring drainage ring ground potential installation device according to claim 3, characterized in that: the square frame (6-1) is fixed on the drainage ring fixing rod (6) through a fixing connecting rod (6-2).
9. The pollution monitoring drainage ring ground potential installation device according to claim 3, characterized in that: the other end of the universal joint shaft (8) is connected with the crank (9) through a universal joint.
10. A method for installing a drain ring ground potential for pollution monitoring is characterized by comprising the following steps:
s1, clamping a clip-shaped block (2-1) into a clip-shaped groove (10-1) of the rotating half ring (10); pushing out the drainage ring fixing rod (6) to enable the square boss (11-1) of the fixed semi-ring (11) to be clamped by the square frame (6-1); clamping the B-shaped pin (7) in an installation limiting hole (5-1) of the gear shaft A (5);
step S2, changing the position relation of the gear shaft A (5), the universal joint shaft (8) and the crank (9) into a Z-shaped crank shape;
step S3, rotating the universal joint shaft (8), driving a big bevel gear (3) to transmit through a small bevel gear (4), enabling a gear shaft B (2) to rotate anticlockwise, and driving a rotating semi-ring (10) to rotate anticlockwise to form a drainage ring with a fixed semi-ring (11);
step S4, after the rotating half ring (10) rotates anticlockwise and is closed with the fixed half ring (11), the sawtooth clamping groove (10-2) of the rotating half ring (10) is clamped by the pressure spring clamp (12);
step S5, changing the position relation of the gear shaft A (5), the universal joint shaft (8) and the crank (9) from a Z-shaped crank shape to a straight shape; the B-shaped pin (7) is pulled out of the mounting limiting hole (5-1) and inserted into the dismounting limiting hole (8-1); pulling back the diversion ring fixing rod (6) to separate the character returning frame (6-1) from the square boss (11-1); and lifting the drainage ring ground potential installation device upwards to separate the clip-shaped fixture block (2-1) from the clip-shaped groove (10-1), and withdrawing the drainage ring ground potential installation device from working.
CN202111526466.1A 2021-12-14 2021-12-14 Device and method for installing sewage monitoring drainage ring and drainage ring at ground potential Pending CN114094356A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111526466.1A CN114094356A (en) 2021-12-14 2021-12-14 Device and method for installing sewage monitoring drainage ring and drainage ring at ground potential

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111526466.1A CN114094356A (en) 2021-12-14 2021-12-14 Device and method for installing sewage monitoring drainage ring and drainage ring at ground potential

Publications (1)

Publication Number Publication Date
CN114094356A true CN114094356A (en) 2022-02-25

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Application Number Title Priority Date Filing Date
CN202111526466.1A Pending CN114094356A (en) 2021-12-14 2021-12-14 Device and method for installing sewage monitoring drainage ring and drainage ring at ground potential

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Cited By (1)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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