CN113783137A - Environment-friendly insulating ring main unit - Google Patents
Environment-friendly insulating ring main unit Download PDFInfo
- Publication number
- CN113783137A CN113783137A CN202111117153.0A CN202111117153A CN113783137A CN 113783137 A CN113783137 A CN 113783137A CN 202111117153 A CN202111117153 A CN 202111117153A CN 113783137 A CN113783137 A CN 113783137A
- Authority
- CN
- China
- Prior art keywords
- insulating gas
- communicating pipe
- storage chamber
- gas storage
- main unit
- 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.)
- Withdrawn
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/045—Details of casing, e.g. gas tightness
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/1004—Structural association with clutches, brakes, gears, pulleys or mechanical starters with pulleys
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Ventilation (AREA)
Abstract
The invention discloses an environment-friendly insulating ring main unit which comprises a cabinet body and a door plate installed on the cabinet body, wherein an insulating gas storage chamber is arranged inside the cabinet body, a communicating pipe penetrates through and slides inside the insulating gas storage chamber, two groups of ventilation assemblies which are vertically distributed penetrate through the inside of the communicating pipe, the top end of the inside of the insulating gas storage chamber is also rotatably connected with a rotary sleeve for driving the communicating pipe to vertically move, the output end of an air pump is communicated with an air pipe, and the output end of the air pipe is communicated with the input end of a shaft sleeve. In the invention, the air pump is started to enable the insulating gas storage chamber to be in a negative pressure state, when the group of ventilation components on the lower side extend out of the insulating gas storage chamber, the insulating gas SF6 is sucked into the insulating gas storage chamber through the hole grooves, and the insulating gas is pre-absorbed, so that the ring main unit is beneficial to protecting the environment, enables maintenance personnel to be in a safe working environment and improves the safety and reliability of the use of the ring main unit.
Description
Technical Field
The invention relates to the technical field of ring main units, in particular to an environment-friendly insulating ring main unit.
Background
The ring main unit is a group of transmission and distribution electrical equipment (high-voltage switch equipment), is arranged in a metal or nonmetal insulating cabinet body or is made into electrical equipment of an assembled interval ring main power supply unit, adopts a load switch and a fuse at the core part, and has the advantages of simple structure, small volume, low price, capability of improving power supply parameters and performance, power supply safety and the like.
In order to ensure the stable operation of the power-on part in the ring main unit, most can fill proper amount of insulating gas into the cabinet body, in order to carry out the arc extinguishing to the electric element in operation, because SF6 gas has the characteristics that stability is high, consequently, the ring main unit on the market at present adopts SF6 gas as the arc extinguishing medium mostly, however do not possess the equipment used along with the existence to insulating gas in the current ring main unit, when corresponding personnel need open the ring main unit and maintain electric element in the cabinet, can lead to the insulating gas in the cabinet to leak away, not only can have some influence to the environment, and high concentration SF6 gas still can cause maintainer breathing difficulty, wheeze, skin and mucous membrane turn blue, phenomenon such as whole body spasm, be unfavorable for corresponding maintenance work.
Disclosure of Invention
The invention aims to: in order to solve the above problems, an environment-friendly insulating ring main unit is provided.
In order to achieve the purpose, the invention adopts the following technical scheme: an environment-friendly insulating ring main unit comprises a main body and a door plate arranged on the main body, wherein an insulating gas storage chamber is arranged in the main body, two cross frames are fixedly arranged at the lower side of the insulating gas storage chamber in the main body, a frame plate is fixedly arranged between the two cross frames through a frame rod, a communicating pipe is arranged in the insulating gas storage chamber in a penetrating and sliding manner, two groups of ventilation assemblies which are vertically distributed are arranged in the communicating pipe in a penetrating manner, each group of ventilation assembly is composed of a plurality of annularly distributed hole grooves, a first sealing part for sealing an opening at the bottom of the communicating pipe is arranged on the frame plate, a shaft sleeve is fixedly arranged at the top end of the inside of the insulating gas storage chamber, an extending end of the shaft sleeve is embedded in the inner side of the communicating pipe and is in sliding connection with the communicating pipe, and a second sealing part for sealing an opening at the bottom of the shaft sleeve is arranged in the communicating pipe, the inside top of insulating gas receipts deposit room still rotates and is connected with in order to order about the cover soon of communicating pipe vertical movement, and revolves the ways and establish in the outside of axle sleeve, the inside top of insulating gas receipts deposit room is provided with in order to order about to revolve cover pivoted wheel chain drive unit, the air pump is installed to the outer end of the cabinet body, the output intercommunication of air pump has the trachea, and the tracheal output is linked together with the input of axle sleeve.
Preferably, the first sealing part comprises a first vertical rod and a first blocking block, the first vertical rod is fixedly arranged at the upper end of the frame plate, and the first blocking block is fixedly arranged in the communicating pipe penetrating through the extending end of the first vertical rod.
Preferably, the first blocking block is of a circular truncated cone structure, and a first blocking ring matched with the first blocking block for use is fixedly arranged inside the communicating pipe.
Preferably, the second sealing part comprises a support, a second upright rod and a second blocking block, the second upright rod is fixedly arranged between the two sets of ventilation assemblies inside the communicating pipe through the support, and the second blocking block is fixedly arranged at the extending end of the second upright rod penetrating through the inner side of the shaft sleeve.
Preferably, the second blocking block is also in a round table structure, and a second blocking ring matched with the second blocking block is arranged in the shaft sleeve.
Preferably, the outer end of axle sleeve sets firmly a plurality of bar teeth that are the annular and distribute, the inside of communicating pipe has the bar groove with the bar tooth adaptation.
Preferably, the outer end of the communicating pipe is fixedly provided with a convex block, the inside of the rotary sleeve is provided with a sliding rail matched with the convex block to slide, and the sliding rail is spirally distributed on the inner side of the rotary sleeve.
Preferably, wheel chain drive unit includes driving motor, drive wheel, follows driving wheel and drive chain, driving motor is installed to the upper end of insulating gas storage room, driving motor's output runs through to the inboard transmission of insulating gas storage room and is connected with the drive wheel, the outer end of revolving the cover has set firmly from the driving wheel, the outside cover from driving wheel and drive wheel is equipped with the driven drive chain of cooperation.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. this application is through being equipped with insulating room of depositing in the cabinet body, be equipped with axle sleeve and communicating pipe in insulating room of depositing, be equipped with the hole groove on communicating pipe, it makes insulating gas room of depositing be the negative pressure state to start the air pump, start wheel chain drive part after that, make communicating pipe downstream, when a set of parts of ventilating that are located the downside will stretch out insulating gas room of depositing, insulating gas SF6 will be inhaled to insulating gas through the hole groove and deposit in the room, the door plant can be opened to the user of this moment, maintain the internal electrical component of cabinet, through absorption in advance to insulating gas, avoid the door plant insulating gas to circulate outside the cabinet when opening, existing be favorable to the protection to the environment and can make the maintenance personal be in safe operational environment again, the fail safe nature that looped netowrk cabinet used has been improved.
2. This application is through being equipped with in the axle sleeve outside and revolve the cover, be equipped with on revolving the cover from the driving wheel, be equipped with driving motor and drive wheel in insulating gas is received and is deposited the room, be equipped with drive chain at the drive wheel with from the driving wheel outside, it drives the drive wheel and rotates to start driving motor, and then make drive chain drive and revolve the cover from fixed revolving of driving wheel and rotate, cooperation through bar tooth and bar groove sets up, when making revolve the cover to communicating pipe transmission, communicating pipe can not rotate along with the rotation of revolving the cover, thereby guarantee the stability of its vertical migration process.
Drawings
FIG. 1 illustrates a front view provided in accordance with an embodiment of the present invention;
FIG. 2 illustrates a side view provided in accordance with an embodiment of the present invention;
fig. 3 illustrates an internal structural view of a cabinet provided according to an embodiment of the present invention;
FIG. 4 illustrates a partial cross-sectional view provided in accordance with an embodiment of the present invention;
fig. 5 illustrates a partial exploded view provided in accordance with an embodiment of the present invention.
Illustration of the drawings:
1. a cabinet body; 2. a door panel; 3. a cross frame; 4. a frame bar; 5. a frame plate; 6. an insulating gas storage chamber; 7. a communicating pipe; 701. a hole groove; 702. a strip-shaped groove; 703. a bump; 8. a first barrier ring; 9. a first upright rod; 10. a first barrier block; 11. a support; 12. a second upright stanchion; 13. a second barrier block; 14. a second barrier ring; 15. a shaft sleeve; 1501. a bar-shaped tooth; 16. screwing a sleeve; 17. a slide rail; 18. a driven wheel; 19. a drive motor; 20. a drive wheel; 21. a drive chain; 22. an air tube; 23. an air pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, the present invention provides a technical solution: an environment-friendly insulating ring main unit comprises a main body 1 and a door plate 2 arranged on the main body 1, an insulating gas storage chamber 6 is arranged in the main body 1, two cross frames 3 are fixedly arranged at the lower side of the insulating gas storage chamber 6 in the main body 1, a frame plate 5 is fixedly arranged between the two cross frames 3 through a frame rod 4, a communicating pipe 7 penetrates through and slides in the insulating gas storage chamber 6, two groups of ventilation assemblies which are vertically distributed are arranged in the communicating pipe 7 in a penetrating manner, each group of ventilation assemblies is composed of a plurality of annularly distributed hole slots 701, a first sealing part for sealing the bottom opening of the communicating pipe 7 is arranged on the frame plate 5, a shaft sleeve 15 is fixedly arranged at the top end in the insulating gas storage chamber 6, the extending end of the shaft sleeve 15 is embedded in the inner side of the communicating pipe 7 and is connected with the communicating pipe 7 in a sliding manner, a second sealing part for sealing the bottom opening of the shaft sleeve 15 is arranged in the main body 7, the top end inside the insulating gas storage chamber 6 is further rotatably connected with a rotary sleeve 16 for driving the communicating pipe 7 to vertically move, the rotary sleeve 16 is sleeved outside the shaft sleeve 15, the top end inside the insulating gas storage chamber 6 is provided with a wheel chain transmission component for driving the rotary sleeve 16 to rotate, the outer end of the cabinet body 1 is provided with an air pump 23, the output end of the air pump 23 is communicated with an air pipe 22, the output end of the air pump 23 is communicated with the input end of the shaft sleeve 15, when a worker needs to overhaul the inside of the cabinet body 1, the air pump 23 arranged on the cabinet body 1 needs to be started to pump the insulating gas storage chamber 6 to a negative pressure state, then the wheel chain transmission component is started to drive the rotary sleeve 16 to rotate, so that the communicating pipe 7 moves downwards, when the first blocking block 10 is separated from the first blocking ring 8, a group of ventilation components positioned at the lower side extends out of the insulating gas storage chamber 6, and then the insulating gas 6 positioned in the cabinet body 1 is sucked into the insulating gas storage chamber 6 through the hole groove 701, accomplish the back to insulating gas's collection, the user can open door plant 2, maintains the electric parts of the internal 1 of cabinet, through the absorption in advance to insulating gas, avoids door plant 2 insulating gas to circulate outside the cabinet when opening, and existing protection to the environment can make the maintenance personal be in safe operational environment again, has improved the fail safe nature that the looped netowrk cabinet used.
Specifically, as shown in fig. 4 and 5, the first sealing member includes a first vertical rod 9 and a first blocking block 10, the upper end of the frame plate 5 is fixedly provided with the first vertical rod 9, the extending end of the first vertical rod 9 penetrates into the communicating tube 7 and is fixedly provided with the first blocking block 10, the first blocking block 10 is in a circular truncated cone structure, the communicating tube 7 is fixedly provided with a first blocking ring 8 used in cooperation with the first blocking block 10, the second sealing member includes a bracket 11, a second vertical rod 12 and a second blocking block 13, the communicating tube 7 is positioned between two sets of ventilation assemblies and is fixedly provided with the second vertical rod 12 through the bracket 11, the extending end of the second vertical rod 12 penetrates into the inner side of the shaft sleeve 15 and is fixedly provided with the second blocking block 13, the second blocking block 13 is also in a circular truncated cone structure, the shaft sleeve 15 is internally provided with a second blocking ring 14 used in cooperation with the second blocking block 13, when the first blocking block 10 is fastened with the first blocking ring 8, two sets of ventilation components are both positioned in the insulating gas storage chamber 6, the insulating gas storage chamber 6 can be in a vacuum state through the air pump 23, along with the downward movement of the communicating pipe 7, when the second blocking block 13 is attached to the second blocking ring 14, the bottom opening of the communicating pipe 7 is attached to the frame plate 5, at this time, one set of ventilation components is positioned in the insulating gas storage chamber 6, the other set of ventilation components is positioned outside the insulating gas storage chamber 6, the insulating gas positioned in the cabinet body 1 is pumped into the insulating gas storage chamber 6, the communicating pipe 7 is moved upward for a certain distance, so that the outer wall of the shaft sleeve 15 covers the ventilation components positioned at the upper side, the inner wall at the bottom of the insulating gas storage chamber 6 covers the ventilation components positioned at the lower side, at this time, the lower space of the cabinet body 1 positioned in the insulating gas storage chamber 6 is communicated with the shaft sleeve 15, and the area can be in a negative pressure state by starting the air pump 23, after the worker finishes the inspection of the electrical components, the insulating gas in the insulating gas storage chamber 6 can be allowed to act again between the electrical components.
Specifically, as shown in fig. 4 and 5, the outer end of the shaft sleeve 15 is fixedly provided with a plurality of bar-shaped teeth 1501 distributed in an annular shape, the inside of the communicating pipe 7 is provided with a bar-shaped groove 702 matched with the bar-shaped teeth 1501, and the communicating pipe 7 is not rotated along with the rotation of the rotating sleeve 16 when the rotating sleeve 16 transmits the communicating pipe 7 through the matching of the bar-shaped teeth 1501 and the bar-shaped groove 702, so that the stability of the vertical moving process of the communicating pipe 7 is ensured.
Specifically, as shown in fig. 4 and 5, the outer end of the communication pipe 7 is fixedly provided with a bump 703, the interior of the rotating sleeve 16 is provided with a slide rail 17 which is matched with the bump 703 to slide, and the slide rail 17 is spirally distributed on the inner side of the rotating sleeve 16, when the slide rail 17 rotates, the bump 703 fixedly arranged on the outer end of the communication pipe 7 slides along the slide rail 17 inside the rotating sleeve 16, and the communication pipe 7 vertically moves through the sliding fit between the slide rail 17 and the bump 703.
Specifically, as shown in fig. 2 to 4, the wheel chain transmission component includes a driving motor 19, a driving wheel 20, a driven wheel 18 and a transmission chain 21, the driving motor 19 is installed at the upper end of the insulating gas storage chamber 6, an output end of the driving motor 19 penetrates through the inner side of the insulating gas storage chamber 6 to be connected with the driving wheel 20 in a transmission manner, the driven wheel 18 is fixedly installed at the outer end of the rotating sleeve 16, the transmission chain 21 in a transmission manner is sleeved on the driven wheel 18 and the driving wheel 20, the driving motor 19 installed on the sliding rail 17 is started to drive the driving wheel 20 to rotate, and then the transmission chain 21 drives the driven wheel 18 and the rotating sleeve 16 fixed with the driven wheel 18 to rotate.
The previous description of the embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. An environment-friendly insulating ring main unit comprises a cabinet body (1) and a door plate (2) installed on the cabinet body (1), and is characterized in that an insulating gas storage chamber (6) is arranged inside the cabinet body (1), two cross frames (3) are fixedly arranged on the lower side of the insulating gas storage chamber (6) inside the cabinet body (1), a frame plate (5) is fixedly arranged between the two cross frames (3) through a frame rod (4), a communicating pipe (7) penetrates through and slides inside the insulating gas storage chamber (6), two groups of ventilation assemblies which are vertically distributed penetrate through the inside of the communicating pipe (7), each group of ventilation assemblies comprises a plurality of hole grooves (701) which are annularly distributed, a first sealing part for sealing the bottom opening of the communicating pipe (7) is arranged on the frame plate (5), a shaft sleeve (15) is fixedly arranged on the top end of the inside of the insulating gas storage chamber (6), and the extension end of axle sleeve (15) inlays the inboard of establishing at communicating pipe (7) and communicating pipe (7) sliding connection, the inside of communicating pipe (7) is provided with closed axle sleeve (15) bottom open-ended second seal part, the inside top of insulating gas collection room (6) still rotates and is connected with in order to order about the cover (16) soon of communicating pipe (7) vertical movement, and revolves cover (16) cover and establish the outside at axle sleeve (15), the inside top of insulating gas collection room (6) is provided with in order to order about to revolve cover (16) pivoted wheel chain drive unit, air pump (23) are installed to the outer end of the cabinet body (1), the output intercommunication of air pump (23) has trachea (22), and the output of trachea (22) is linked together with the input of axle sleeve (15).
2. The environmental-friendly insulated ring main unit according to claim 1, wherein the first sealing member comprises a first vertical rod (9) and a first blocking block (10), the first vertical rod (9) is fixedly arranged at the upper end of the frame plate (5), and the first blocking block (10) is fixedly arranged at the extending end of the first vertical rod (9) penetrating through the communicating pipe (7).
3. The environment-friendly insulating ring main unit as claimed in claim 2, wherein the first blocking block (10) is a circular truncated cone structure, and a first blocking ring (8) used in cooperation with the first blocking block (10) is fixedly arranged inside the communicating pipe (7).
4. The environment-friendly insulated ring main unit according to claim 1, wherein the second sealing member includes a bracket (11), a second upright (12) and a second blocking block (13), the second upright (12) is fixedly disposed between the two sets of ventilation assemblies inside the communication pipe (7) through the bracket (11), and the second blocking block (13) is fixedly disposed at an extending end of the second upright (12) penetrating through to an inner side of the shaft sleeve (15).
5. The environment-friendly insulated ring main unit as claimed in claim 4, wherein the second blocking block (13) is also in a truncated cone structure, and the inside of the shaft sleeve (15) is provided with a second blocking ring (14) used in cooperation with the second blocking block (13).
6. The environment-friendly insulated ring main unit as claimed in claim 5, wherein the outer end of the shaft sleeve (15) is fixedly provided with a plurality of annularly distributed bar-shaped teeth (1501), and the inside of the communicating pipe (7) is provided with a bar-shaped groove (702) adapted to the bar-shaped teeth (1501).
7. The environment-friendly insulating ring main unit as claimed in claim 6, wherein the outer end of the communicating pipe (7) is fixedly provided with a protruding block (703), the inside of the rotary sleeve (16) is provided with a sliding rail (17) which is matched with the protruding block (703) to slide, and the sliding rail (17) is spirally distributed on the inner side of the rotary sleeve (16).
8. The environment-friendly insulating ring main unit as claimed in claim 7, wherein the wheel chain transmission component comprises a driving motor (19), a driving wheel (20), a driven wheel (18) and a transmission chain (21), the driving motor (19) is installed at the upper end of the insulating gas storage chamber (6), the output end of the driving motor (19) penetrates through the inner side transmission of the insulating gas storage chamber (6) to be connected with the driving wheel (20), the outer end of the rotary sleeve (16) is fixedly provided with the driven wheel (18), and the transmission chain (21) matched with the transmission is sleeved on the outer side of the driven wheel (18) and the driving wheel (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111117153.0A CN113783137A (en) | 2021-09-23 | 2021-09-23 | Environment-friendly insulating ring main unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111117153.0A CN113783137A (en) | 2021-09-23 | 2021-09-23 | Environment-friendly insulating ring main unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113783137A true CN113783137A (en) | 2021-12-10 |
Family
ID=78852991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111117153.0A Withdrawn CN113783137A (en) | 2021-09-23 | 2021-09-23 | Environment-friendly insulating ring main unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113783137A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600232A (en) * | 2020-05-14 | 2020-08-28 | 中气电力装备有限公司 | Environment-friendly air insulation looped netowrk cabinet |
| CN212210285U (en) * | 2020-05-14 | 2020-12-22 | 中气电力装备有限公司 | Environment-friendly air insulation looped netowrk cabinet |
| US20210075201A1 (en) * | 2018-05-24 | 2021-03-11 | Mitsubishi Electric Corporation | Gas-insulated switching device |
| CN112490882A (en) * | 2020-12-17 | 2021-03-12 | 湖北祥源电气科技有限公司 | Gas-insulated common-box type ring main unit |
| CN113241656A (en) * | 2021-05-27 | 2021-08-10 | 浙江迪思威电气股份有限公司 | Air insulation high-voltage vacuum ring main unit |
-
2021
- 2021-09-23 CN CN202111117153.0A patent/CN113783137A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210075201A1 (en) * | 2018-05-24 | 2021-03-11 | Mitsubishi Electric Corporation | Gas-insulated switching device |
| CN111600232A (en) * | 2020-05-14 | 2020-08-28 | 中气电力装备有限公司 | Environment-friendly air insulation looped netowrk cabinet |
| CN212210285U (en) * | 2020-05-14 | 2020-12-22 | 中气电力装备有限公司 | Environment-friendly air insulation looped netowrk cabinet |
| CN112490882A (en) * | 2020-12-17 | 2021-03-12 | 湖北祥源电气科技有限公司 | Gas-insulated common-box type ring main unit |
| CN113241656A (en) * | 2021-05-27 | 2021-08-10 | 浙江迪思威电气股份有限公司 | Air insulation high-voltage vacuum ring main unit |
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| PB01 | Publication | ||
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| WW01 | Invention patent application withdrawn after publication | ||
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Application publication date: 20211210 |