CN112289633B

CN112289633B - Vacuum circuit breaker

Info

Publication number: CN112289633B
Application number: CN202011145705.4A
Authority: CN
Inventors: 黄忠良
Original assignee: State Grid Yili Yihe Power Supply Co ltd
Current assignee: State Grid Yili Yihe Power Supply Co ltd
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2023-10-20
Anticipated expiration: 2040-10-23
Also published as: CN112289633A

Abstract

The invention relates to the technical field of vacuum circuit breakers and discloses a vacuum circuit breaker which comprises a ceramic cylinder, wherein an inner cylinder is sleeved in the ceramic cylinder, an arc extinguishing chamber is arranged in the inner cylinder, a static end conducting plate is fixedly arranged at the top of the inner cylinder, a bayonet is arranged at the top of the static end conducting plate, a protective shell is fixedly arranged at the top of the inner cylinder, and a sealing gasket is fixedly arranged in the middle of the bottom of the protective shell. This vacuum circuit breaker reaches through being provided with ceramic cylinder, quiet end current-conducting plate and protective housing etc. and dismantles simple purpose, and whole structure does not adopt integral type structure, has avoided dismantling layer upon layer of follow-up maintenance, and operating personnel only need with ceramic cylinder and the bolt and the fixing bolt of inner tube upper and lower end take off can, and this moment whole structure just is opened completely, has made things convenient for follow-up inspection maintenance greatly to this mode operation degree of difficulty is little, does not need too much operating experience, has both reduced operating personnel's working strength, has also guaranteed its safety of maintenance.

Description

Vacuum circuit breaker

Technical Field

The invention relates to the technical field of vacuum circuit breakers, in particular to a vacuum circuit breaker.

Background

The vacuum circuit breaker is named because the arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are both high vacuum; the vacuum circuit breaker has the advantages of small volume, light weight, suitability for frequent operation and no maintenance for arc extinction, is more popular in power distribution networks, is an indoor power distribution device in a three-phase alternating current system of 3-10 kV and 50Hz, can be used for protecting and controlling electrical equipment in industrial and mining enterprises, power plants and substations, is particularly suitable for use places requiring oilless maintenance and frequent operation, can be configured in centrally installed switchgear, double-layer cabinets and fixed cabinets and is used for controlling and protecting high-voltage electrical equipment, and mainly comprises three parts: the device comprises a vacuum arc-extinguishing chamber, an electromagnetic or spring operating mechanism, a bracket and other components; the working principle of the vacuum circuit breaker is as follows: when the movable contact and the static contact are separated under the action of an operating mechanism, an electric arc is generated between the contacts, steam volatilizes from the surface of the contact at high temperature, and because the contacts are designed into special shapes, a magnetic field is generated when current passes through the contacts, the electric arc rapidly moves along the tangential direction of the surface of the contacts under the action of the magnetic field, part of metal steam is condensed on a metal cylinder (shielding cover), the electric arc is extinguished when the electric arc passes through the natural zero time, and the medium intensity between the contacts is rapidly recovered

The existing vacuum circuit breaker has some problems when in use: the most obvious is that the whole structure is disassembled, the equipment is required to be windy and rainy all the year round because the equipment is arranged outdoors, the surface is often seriously influenced, in order to ensure that the equipment can be used normally, operators need to check the equipment regularly, the existing vacuum circuit breaker checking means often need to climb on a supporting column by the operators, but because the sealing effect is good, the structure is often wrapped very much before, the whole structure is disassembled layer by layer, basically, the whole structure is completely disassembled, the situation is dangerous in high-altitude operation, the working strength of the operators is relatively high on one hand, and the specific checking is inconvenient on the other hand.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a vacuum circuit breaker which has the advantages of good sealing effect, easy disassembly and good protection effect, and solves the problems proposed by the technical background.

The invention provides the following technical scheme: the utility model provides a vacuum circuit breaker, includes ceramic cylinder, the inner tube has been cup jointed to the inside of ceramic cylinder, the explosion chamber has been seted up to the inside of inner tube, and the top fixed mounting of inner tube has quiet end current-conducting plate, the bayonet socket has been seted up at the top of quiet end current-conducting plate, the top fixed mounting of inner tube has the protective housing, the middle part fixed mounting of protective housing bottom has sealed the pad, the top fixed mounting of sealed pad has the panel beating frid, the middle part movable joint at protective housing top has the water-swelling water-stop ring, and the top movable joint of protective housing has the top cap, the top fixed mounting of top cap has fixing bolt, the inside upper end fixed mounting of inner tube has quiet conducting rod, and the inside lower extreme movable joint of inner tube has the movable conducting rod.

The bottom fixed welding of ceramic section of thick bamboo has a lift section of thick bamboo, the bottom fixed mounting of moving the conducting rod has the lifter plate, the bottom fixed mounting of lifter plate has the electric wire, and the bottom fixed welding of lift section of thick bamboo has the base, the inside middle part fixed mounting of lift section of thick bamboo has buffer, when needs carry out brake opening and closing operations, often need promote to move upward by moving the conducting rod, then contact with quiet conducting rod fast, thereby realize the release of electric arc, current structure tends that the electric arc release process is slower, the follow-up resilience of structure also is not fast, cause the drawing and the extension of electric arc very easily, be difficult to cause unexpected accident now, when moving the conducting rod to receive exogenic action and quiet conducting rod contact, whole lifter plate can also receive buffer's pulling this moment, after the lower extreme effort disappears, buffer begins quick resilience this moment, thereby accomplish the separation of moving conducting rod and quiet conducting rod, rebound speed is fast, can guarantee user's safety.

The buffering device comprises a fixed ring, the two ends of the front surface of the fixed ring are fixedly provided with a movable box, the inside of the movable box is movably clamped with a limiting block, the inner side of the limiting block is fixedly provided with a spring, the middle part of the right end of the movable box is fixedly provided with a fixed block, the upper end and the lower end of the fixed block are fixedly provided with tension springs, the fixed ring is movably clamped in the middle part of the inside of the lifting cylinder, the whole buffering device is quite simple in structure and mainly fixed in the lifting plate by virtue of the springs, when the lifting plate moves under the action of external force, the springs and the tension springs which are kept balanced originally can change in force, but because the external force is too large, no elastic force is released at the moment, when the bottom action disappears, the springs and the tension springs can act quickly until the whole lifting plate returns to the beginning, meanwhile, the movable conducting rod can be pulled back quickly, so that the rebound of the structure is realized, and the rebound speed is high.

The fixed end conducting plate is of a disc, round table and semi-sphere integrated structure, the bottom of the fixed end conducting plate is movably clamped with the fixed conducting rod, the fixing bolt sequentially penetrates through the top cover, the water-swelling water stop ring, the sealing gasket, the metal plate groove plate and the protecting shell from top to bottom and is in threaded connection with the inside of the bayonet, the circuit breaker needs to be inspected for an inner structure after being used for a period of time, effective work can be guaranteed when the circuit breaker needs to be used subsequently, but the original dismounting structure is too complex and troublesome, all parts of the circuit breaker need to be dismounted basically, the inside can be observed conveniently, the sealing protection of the protecting shell at the top is matched by utilizing the sleeving mode of the inner barrel and the ceramic barrel, the sealing capability of the circuit breaker can be guaranteed to be consistent with that of a conventional structure, but the structure is very convenient and easy to use when the circuit breaker is dismounted and inspected subsequently, and the structure inside the whole arc extinguishing chamber can be taken out for observation.

The top of ceramic cylinder, the top and the protective housing of inner tube adopt bolted connection, and ceramic cylinder and the bottom of inner tube all adopt bolted connection, in order to guarantee sealed effectual, the vacuum circuit breaker structure in the past often adopts the integral type shell, and need the structure parcel of layer upon layer to live, this structure just need dismantle layer upon layer when dismantling, first can increase operating personnel's working strength, whole equipment often belongs to the high altitude installation in addition, dismantle inconvenient operation with it completely, operating personnel does not also have corresponding region to provide to place, maintenance inspection has certain danger, now set up to this pattern, only need open the bolt just can directly take out inside explosion chamber and observe, both convenient quick overhaul, simultaneously also very safe.

The fixed ring is carefully selected, the quantity of solid fixed ring is two, remove the box and be C shape structure, stopper, fixed block and extension spring are all in the inside that removes the box, the upper and lower end of spring respectively with the periphery of lifter plate, the inner wall fixed connection of stopper, when needs carry out electric arc release, lower extreme structure begins to carry out the application of upward force to the lifter plate this moment, lifter plate can compress upper end spring and extension spring this moment, but because the joint lower extreme structure of stopper only can be elongated, spring and extension spring's power can be extruded together this moment, because external force is not good to release, after accomplishing the contact of quiet conducting rod, lower extreme application force disappears this moment, the spring is released fast with the power of extension spring this moment, can make whole structure reset fast afterwards, thereby guarantee the safe handling of structure.

The protection shell is characterized in that two clamping rings are fixedly welded in the middle of the top of the protection shell, the water-swelling water stop ring is placed in the inner clamping ring, two annular grooves are formed in the bottom of the top cover and are respectively matched with the two clamping rings, the two annular grooves are respectively matched with the two clamping rings, the upper end structure can be effectively and integrally removed in order to ensure that the upper end structure is capable of being effectively and effectively removed, meanwhile, the purpose of good sealing effect is achieved, at the moment, all sealing pieces at the upper end are clamped in a matched mode, and a plurality of concave-convex grooves are matched and clamped in a matched mode, so that water and air can be prevented from penetrating.

Compared with the prior art, the invention has the following beneficial effects:

1. the vacuum circuit breaker achieves the purpose of simple disassembly by arranging the ceramic cylinder, the static end conducting plate, the protective shell and the like, the whole structure does not adopt an integrated structure, the subsequent overhaul layer-by-layer disassembly is avoided, an operator only needs to take down the bolts and the fixing bolts at the upper end and the lower end of the ceramic cylinder and the inner cylinder, at the moment, the whole structure is completely opened, the operating personnel can take down each structure in proper order from the upper end, and this mounting means not only can inspect circuit breaker inner structure, even the explosion chamber can all directly take out, has made things convenient for subsequent inspection maintenance greatly to this mode operation degree of difficulty is little, does not need too much work experience, has both reduced operating personnel's working strength, has also guaranteed the safety of its maintenance.

2. This vacuum circuit breaker reaches sealed effectual purpose through being provided with fixing bolt, meet water inflation water stop ring and panel beating frid etc. because this vacuum circuit breaker shell belongs to combined structure, whole middle part structure is direct with external environment contact, with this very easily receive the influence of steam and air, set up through being provided with the panel beating frid therein, sealed pad, meet water inflation water stop ring and top cap structure mutually support, with fixing bolt outlying hole is filled effectively, the middle part at protective housing top and top cap belong to the form of annular joint simultaneously, just protect water inflation water stop ring effectively inside, whole seal structure is provided with the multilayer protection, sealed effectual, can reach integrated into one piece structure's effect basically.

3. This vacuum circuit breaker reaches the purpose that protection effect is good through being provided with buffer, move conducting rod and lifter plate etc. when needing to carry out the electric arc release, often need promote to move the conducting rod upward and remove, afterwards quick and quiet conducting rod contact, current structure is often electric arc release process slower, the follow-up resilience of structure is also not quick, the drawing that causes the electric arc very easily becomes and extends, very easily cause unexpected accident, now be provided with buffer, when moving the conducting rod receives exogenic action and quiet conducting rod contact, the lifter plate drives and moves the conducting rod and rise, simultaneously the spring of lower extreme and extension spring are pulled under the drive of lifter plate, the spring and the extension spring of upper end are then are in the same place by the extrusion, after accomplishing to move conducting rod and quiet conducting rod release electric arc, the power of lower extreme can be quick disappearance, the resilience force of accumulating in the buffer begins to be released, afterwards whole lifter plate can be quick the return to initial position, the safety of user can be guaranteed.

Drawings

FIG. 1 is a schematic view of the internal cross-section of the structure of the present invention;

FIG. 2 is a schematic view of the structure of the present invention;

FIG. 3 is a schematic cross-sectional view of a ceramic cylinder and an inner cylinder of the structure of the invention;

FIG. 4 is a schematic view of the overall upper end of the structure of the present invention;

FIG. 5 is an exploded view of the upper end of the structure of the present invention;

FIG. 6 is a schematic diagram of a structural cushioning device of the present invention.

In the figure: 1. a ceramic cylinder; 2. an inner cylinder; 3. an arc extinguishing chamber; 4. a static end conductive plate; 5. a bayonet; 6. a protective shell; 7. a sheet metal trough plate; 8. a sealing gasket; 9. a water-swellable water stop ring; 10. a top cover; 11. a fixing bolt; 12. a static conductive rod; 13. a movable conductive rod; 14. a lifting cylinder; 15. a lifting plate; 16. an electric wire; 17. a base; 18. a buffer device; 181. a fixing ring; 182. a moving case; 183. a limiting block; 184. a spring; 185. a fixed block; 186. and a tension spring.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.

Referring to fig. 1-6, a vacuum circuit breaker comprises a ceramic cylinder 1, an inner cylinder 2 is sleeved in the inner part of the ceramic cylinder 1, an arc extinguishing chamber 3 is arranged in the inner cylinder 2, a static end conducting plate 4 is fixedly arranged at the top of the inner cylinder 2, a bayonet 5 is arranged at the top of the static end conducting plate 4, a protective shell 6 is fixedly arranged at the top of the inner cylinder 2, a sealing gasket 8 is fixedly arranged at the middle part of the bottom of the protective shell 6, a metal plate groove plate 7 is fixedly arranged at the top of the sealing gasket 8, a water-swelling water stop ring 9 is movably clamped in the middle of the top of the protective shell 6, a top cover 10 is movably clamped at the top of the protective shell 6, a fixing bolt 11 is fixedly arranged at the top of the top cover 10, a static conducting rod 12 is fixedly arranged at the upper end of the inner part of the inner cylinder 2, and a movable conducting rod 13 is movably clamped at the lower end of the inner part of the inner cylinder 2.

The bottom of the ceramic cylinder 1 is fixedly welded with a lifting cylinder 14, the bottom of the movable conducting rod 13 is fixedly provided with a lifting plate 15, the bottom of the lifting plate 15 is fixedly provided with an electric wire 16, the bottom of the lifting cylinder 14 is fixedly welded with a base 17, the middle part of the inside of the lifting cylinder 14 is fixedly provided with a buffer device 18, when opening and closing operations are required to be carried out, the movable conducting rod 13 is required to be pushed to move upwards, and then is contacted with the static conducting rod 12 quickly, so that the release of an electric arc is realized, the existing structure is slow in the arc release process, the subsequent rebound of the structure is not quick, the electric arc is easily pulled and expanded, accidents are easily caused, the buffer device 18 is now arranged, when the movable conducting rod 13 is contacted with the static conducting rod 12 under the action of external force, the whole lifting plate 15 is also pulled by the buffer device 18, and after the action of the lower end is disappeared, the buffer device 18 begins to rebound quickly, so that the separation of the movable conducting rod 13 and the static conducting rod 12 is completed, the rebound speed is quick, and the safety of a user can be ensured.

The buffer device 18 includes a fixed ring 181, two ends of the front of the fixed ring 181 are fixedly provided with a moving box 182, a limiting block 183 is movably clamped inside the moving box 182, a spring 184 is fixedly installed inside the limiting block 183, a fixed block 185 is fixedly installed in the middle of the right end of the moving box 182, a tension spring 186 is fixedly installed at the upper end and the lower end of the fixed block 185, the fixed ring 181 is movably clamped in the middle of the inside of the lifting cylinder 14, the whole buffer device 18 is quite simple in structure and mainly fixed in the lifting plate 15 by virtue of the spring 184, when the lifting plate 15 is subjected to external force to move, the spring 184 and the tension spring 186 which are kept balanced originally can change in force, but no elastic force is released at the moment because the external force is too large, when the bottom is lost, the spring 184 and the tension spring 186 can act quickly at the moment, so that the whole lifting plate 15 returns to the beginning, and meanwhile, the movable conductive rod 13 can be quickly pulled back, thereby realizing rebound of the structure, and the rebound speed and the flying effect are good.

The static end conductive plate 4 is of a disc, round table and semi-sphere integrated structure, the static conductive rod 12 is movably clamped at the bottom of the static end conductive plate 4, the fixing bolt 11 sequentially penetrates through the top cover 10, the water-swelling water stop ring 9, the sealing gasket 8, the metal plate groove plate 7 and the protective shell 6 from top to bottom and is in threaded connection with the inside of the bayonet 5, the circuit breaker needs to be subjected to internal structure inspection after being used for a period of time, effective work can be ensured when the circuit breaker needs to be used subsequently, but the original dismounting structure is too complicated and troublesome, all parts of the circuit breaker need to be completely dismounted basically, the inside can be conveniently observed, the sealing protection of the protective shell 6 at the top can be ensured to be consistent with the conventional structure by utilizing the sleeving mode of the inner cylinder 2 and the ceramic cylinder 1, but the structure is convenient and easy to use when the circuit breaker is dismounted subsequently, the internal structure of the whole arc extinguishing chamber 3 can be taken out for observation, and the circuit breaker is convenient and easy to use.

Wherein, the top of ceramic cylinder 1, the top and the protective housing 6 adoption bolted connection of inner tube 2, and the ceramic cylinder 1 all adopts bolted connection with the bottom of inner tube 2, the vacuum circuit breaker structure in the past is in order to guarantee sealed effectual, often adopt integral type shell, and need the structure parcel of layer upon layer to live, this structure just need dismantle layer upon layer when dismantling, first can increase operating personnel's working strength, whole equipment often belongs to the high altitude construction in addition, dismantle inconvenient operation with it completely, operating personnel does not have corresponding region to provide to place yet, maintenance inspection has certain danger, now set up into this pattern, only need open the bolt just can directly take out inside explosion chamber 3 and observe, both make things convenient for the quick overhaul, simultaneously also very safe.

The number of the fixing rings 181 is two, the moving box 182 is in a C-shaped structure, the limiting block 183, the fixing block 185 and the tension spring 186 are all arranged in the moving box 182, the upper end and the lower end of the spring 184 are respectively fixedly connected with the periphery of the lifting plate 15 and the inner wall of the limiting block 183, when electric arc release is needed, the lower end structure starts to apply upward force to the lifting plate 15, the lifting plate 15 compresses the upper end spring 184 and the tension spring 186, but the clamping lower end structure of the limiting block 183 can only be lengthened, the force of the spring 184 and the tension spring 186 can be extruded together because the external force is not well released, after the contact of the dynamic and static conducting rods 12 is completed, the force exerted on the lower end is lost, and the force of the spring 184 and the tension spring 186 is quickly released, so that the whole structure can be quickly restored, and the safe use of the structure is ensured.

Wherein, the fixed welding in middle part at protective housing 6 top has two joint rings, meets water expansion water stop ring 9 and places in interior joint ring, and two annular have been seted up to top cap 10's bottom, two annular respectively with two joint ring looks adaptations, can realize holistic effective demolishment in order to guarantee upper end structure, realize sealed effectual purpose simultaneously, adopt the form of joint between each sealing member of upper end this moment, a plurality of tongue-and-groove cooperation joint can avoid the infiltration of aqueous vapor and outside air.

Working principle: when the arc release of the device is needed, the outside starts to apply pressure to the inside, then the base 17 starts to apply a pressing force upwards, meanwhile, the lifting plate 15 and the movable conducting rod 13 start to move upwards, meanwhile, the spring 184 and the tension spring 186 at the lower end are pulled and stretched under the driving of the lifting plate 15, the spring 184 and the tension spring 186 at the upper end are extruded together, after the movable conducting rod 13 and the static conducting rod 12 are contacted and released, the force at the lower end rapidly disappears, the rebound force accumulated in the buffer device 18 starts to be released, then the whole lifting plate 15 rapidly returns to the initial position, and the whole arc release process is finished.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Also in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. And in the drawings of the present invention, the filling patterns are only for distinguishing the layers, and are not limited in any way.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. Vacuum circuit breaker, comprising a ceramic cylinder (1), characterized in that: the ceramic cylinder is characterized in that an inner cylinder (2) is sleeved in the ceramic cylinder (1), an arc extinguishing chamber (3) is arranged in the inner cylinder (2), a static end conducting plate (4) is fixedly arranged at the top of the inner cylinder (2), a bayonet (5) is arranged at the top of the static end conducting plate (4), a protective shell (6) is fixedly arranged at the top of the inner cylinder (2), a sealing gasket (8) is fixedly arranged in the middle of the bottom of the protective shell (6), a sheet metal groove plate (7) is fixedly arranged at the bottom of the sealing gasket (8), a water-swelling water stop ring (9) is movably clamped at the middle of the top of the protective shell (6), a top cover (10) is movably clamped at the top of the protective shell (6), a fixing bolt (11) is fixedly arranged at the top of the top cover (10), a static conducting rod (12) is fixedly arranged at the upper end of the inner part of the inner cylinder (2), and a movable conducting rod (13) is movably clamped at the lower end of the inner part of the inner cylinder (2).

The bottom of the ceramic cylinder (1) is fixedly welded with a lifting cylinder (14), the bottom of the movable conducting rod (13) is fixedly provided with a lifting plate (15), the bottom of the lifting plate (15) is fixedly provided with an electric wire (16), the bottom of the lifting cylinder (14) is fixedly welded with a base (17), and the middle part of the inside of the lifting cylinder (14) is fixedly provided with a buffer device (18);

the buffer device (18) comprises a fixed ring (181), wherein both ends of the front surface of the fixed ring (181) are fixedly provided with a movable box (182), a limiting block (183) is movably clamped in the movable box (182), a spring (184) is fixedly arranged on the inner side of the limiting block (183), a fixed block (185) is fixedly arranged in the middle of the right end of the movable box (182), tension springs (186) are fixedly arranged at the upper end and the lower end of the fixed block (185), and the fixed ring (181) is movably clamped in the middle of the inside of the lifting cylinder (14);

the number of the fixing rings (181) is two, the movable box (182) is of a C-shaped structure, the limiting block (183), the fixing block (185) and the tension spring (186) are all arranged in the movable box (182), and the upper end and the lower end of the spring (184) are fixedly connected with the periphery of the lifting plate (15) and the inner wall of the limiting block (183) respectively.

2. A vacuum interrupter as defined in claim 1, wherein: the static end conducting plate (4) is of an integrated structure of a disc, a round table and a semicircle, a static conducting rod (12) is movably clamped at the bottom of the static end conducting plate (4), and the fixing bolt (11) sequentially penetrates through the top cover (10), the water-swelling water stop ring (9), the sealing gasket (8), the metal plate groove plate (7) and the protective shell (6) from top to bottom and is in threaded connection with the inside of the bayonet (5).

3. A vacuum interrupter as defined in claim 1, wherein: the top of the ceramic cylinder (1), the top of the inner cylinder (2) and the protective shell (6) are in threaded connection through bolts, and the ceramic cylinder (1) is in threaded connection with the bottom of the inner cylinder (2).

4. A vacuum interrupter as defined in claim 1, wherein: the middle part fixed welding at protective housing (6) top has two joint rings, meet water inflation water stop ring (9) and place in the joint ring, two annular have been seted up to the bottom of top cap (10), two the annular respectively with two joint ring looks adaptations.