CN112289633A

CN112289633A - Vacuum circuit breaker

Info

Publication number: CN112289633A
Application number: CN202011145705.4A
Authority: CN
Inventors: 黄忠良
Original assignee: Individual
Current assignee: State Grid Yili Yihe Power Supply Co ltd
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2021-01-29
Anticipated expiration: 2040-10-23
Also published as: CN112289633B

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 inside the ceramic cylinder, an arc extinguish chamber is arranged inside the inner cylinder, a static end current conducting plate is fixedly arranged at the top of the inner cylinder, a bayonet is arranged at the top of the static end current 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, through being provided with a ceramic section of thick bamboo, quiet end current conducting plate reaches dismantlement simple purpose with protective housing etc., whole structure does not adopt the integral type structure, the dismantlement layer upon layer of having avoided follow-up maintenance, operating personnel only need with ceramic section of thick bamboo and inner tube on the bolt of lower extreme and fixing bolt take off can, whole structure has just been opened completely this moment, subsequent inspection maintenance has been made things convenient for greatly, and this mode operation degree of difficulty is little, do not need too many work experience, operating personnel's working strength has both been reduced, the safety of its maintenance has also been guaranteed.

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 arc extinguishing media and insulating media of a contact gap after arc extinguishing are high vacuum; it has small, light in weight, be applicable to frequent operation, the arc extinguishing need not overhaul the advantage, it is comparatively popularized to use in the distribution network, vacuum circuit breaker is 3 ~ 10kV, the indoor distribution device among the 50Hz three-phase AC system, can supply the industrial and mining enterprise, the power plant, use as electrical equipment's protection and control in the transformer substation, the specially adapted requires oilless, the use place of few maintenance and frequent operation, the circuit breaker can dispose in put the cabinet, double-deck cabinet, as control and protection high-voltage electrical equipment in the fixed cabinet and use, vacuum circuit breaker mainly contains three major parts: vacuum arc-extinguishing chamber, electromagnetic or spring operating mechanism, support and other components; the working principle of the vacuum circuit breaker is as follows: when the moving and static contacts are switched off under the action of the operating mechanism, electric arc is generated between the contacts, steam is volatilized from the surfaces of the contacts at high temperature, a magnetic field is generated when current passes through the magnetic field due to the special shape of the contacts, the electric arc rapidly moves along the tangential direction of the surfaces of the contacts under the action of the magnetic field, partial metal steam is condensed on the metal cylinder (shielding cover), the electric arc is extinguished when the electric arc naturally passes through zero, and the medium strength between the contacts is rapidly recovered

There are still some problems in current vacuum circuit breaker when using: the most obvious is the dismantlement of whole structure and handles, this equipment is because set up outdoor, need receive throughout the year and blow the rain and hit, often receive the influence very seriously with this surface, in order to guarantee that its work that can be normal uses, operating personnel need regularly inspect these equipment and handle, current vacuum circuit breaker inspection means often need operating personnel to climb on the support column, but because before in order to guarantee that its is sealed effectual, often structure parcel is very much, dismantle and need carry out the dismantlement layer by layer, just basically decompose whole structure completely, this condition of high altitude construction is dangerous, operating personnel's working strength is great on the one hand, and on the one hand concrete inspection is also very inconvenient.

Disclosure of Invention

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

The invention provides the following technical scheme: the utility model provides a vacuum circuit breaker, includes a pottery section of thick bamboo, the inner tube has been cup jointed to the inside of a pottery section of thick bamboo, 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 who fills up has the panel beating frid, the middle part activity joint at protective housing top has water-swelling seal ring, and the top activity 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.

Carefully selecting, a lifting cylinder is fixedly welded at the bottom of the ceramic cylinder, a lifting plate is fixedly installed at the bottom of the movable conducting rod, an electric wire is fixedly installed at the bottom of the lifting plate, a base is fixedly welded at the bottom of the lifting cylinder, a buffer device is fixedly installed in the middle of the interior of the lifting cylinder, when the opening and closing operations are required, the movable conducting rod is often required to be pushed to move upwards and then is rapidly contacted with the static conducting rod, so that the electric arc is released, the electric arc releasing process is slow in the existing structure, the subsequent rebounding of the structure is not rapid enough, the electric arc is easily pulled and extended, accidents are easily caused, a buffer device is arranged, when the movable conducting rod is contacted with the static conducting rod under the action of external force, the whole lifting plate is also pulled by the buffer device, and after the acting force at the lower end disappears, the buffer device begins to rebound rapidly, therefore, the separation of the movable conducting rod and the static conducting rod is completed, the rebounding speed is high, and the safety of a user can be ensured.

The buffering device is selected, the buffering device comprises a fixing ring, the two positive ends of the fixing ring are fixedly provided with a movable box, the inner part 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 fixing block, the upper end and the lower end of the fixing block are fixedly provided with tension springs, the fixing ring is movably clamped in the middle part of the inner part of a lifting cylinder, the whole buffering device is very simple in structure and mainly fixed in a lifting plate by the spring, when the lifting plate moves under the action of external force, the spring and the tension spring which are originally kept in balance can change force, but because the external acting force is too large, the elastic force can not be released by any method at the moment, when the bottom action disappears, the spring and the tension spring can act rapidly, so that the whole lifting plate, therefore, the rebound of the structure is realized, and the rebound speed is high and the effect is good.

Carefully, the static end conductive plate is of an integrated structure of a disc, a round table and a semi-sphere, the bottom of the static end conductive plate is movably clamped with a static conductive rod, a fixing bolt sequentially penetrates through a top cover, a water swelling water stop ring, a sealing gasket, a sheet metal groove plate and a protective shell from top to bottom and is in threaded connection with the inside of a bayonet, the circuit breaker needs to check the internal structure after being used for a period of time, and can effectively work when being used subsequently, but the previous disassembly structure is too complicated and troublesome, basically, all parts of the circuit breaker need to be completely disassembled, the inside is convenient to observe, the sealing protection of the protective shell at the upper top part is matched by using the sleeving form of an inner cylinder and a ceramic cylinder, the sealing capability of the circuit breaker can be ensured to be consistent with that of a conventional structure, but the structure is very convenient and easy to disassemble subsequently, and only the bolts at the upper end and the lower end need, the structure inside the whole arc extinguish chamber can be taken out for observation, and the arc extinguish chamber is very convenient and easy to use.

Choice, the top of a pottery section of thick bamboo, the top and the protective housing of inner tube adopt bolt threaded connection, and the bottom of a pottery section of thick bamboo and inner tube all adopts bolted connection, vacuum circuit breaker structure in the past is good in order to guarantee sealed effect, often adopt the integral type shell, and need structure parcel layer upon layer to live, this structure just need dismantle layer upon layer when dismantling, one can increase operating personnel's working strength, whole equipment often belongs to the high altitude installation in addition, dismantle inconvenient operation completely with it, operating personnel also do not have corresponding region to provide and place, there is certain danger in the maintenance inspection, set this pattern now, only need open the bolt and just can directly take out the observation with inside explosion chamber, both make things convenient for quick maintenance, it is also very safe simultaneously.

Choice, gu fixed ring's quantity is two, it is C shape structure to remove the box, stopper, fixed block and extension spring are all in the inside of removing 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, the lifter plate can compress upper end spring and extension spring this moment, but because the joint lower extreme structure of stopper can only be elongated, the force of spring and extension spring can be extruded together this moment, because the effect of external force is not released well, after accomplishing the sound conducting rod contact, the lower extreme application force disappears this moment, the force of spring and extension spring is released fast this moment, can make whole structure reset fast afterwards to this safe handling who guarantees the structure.

Carefully, the fixed welding in middle part at protective housing top has two joint rings, in the joint ring including water inflation seal ring is placed, two annulars, two have been seted up to the bottom of top cap the annular respectively with two joint ring looks adaptations, two annulars respectively with two joint ring looks adaptations, can enough realize holistic effective demolising in order to guarantee the upper end structure, realize simultaneously sealed effectual purpose, with the form of adopting the joint between each sealing member of upper end this moment, the infiltration of aqueous vapor and outside air can be avoided to a plurality of tongue and groove cooperation joints.

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

1. this vacuum circuit breaker, through being provided with a ceramic section of thick bamboo, quiet end current conducting plate reaches dismantlement simple purpose with protective housing etc., whole structure does not adopt the integral type structure, the dismantlement layer upon layer of having avoided follow-up maintenance, operating personnel only need with ceramic section of thick bamboo and inner tube on the bolt of lower extreme and fixing bolt take off can, whole structure has just been opened completely this moment, operating personnel can follow the upper end and take off each structure according to the order in proper order, this mounting means, not only can inspect circuit breaker inner structure, even the explosion chamber can both directly take out, subsequent inspection maintenance has been made things convenient for greatly, and the mode operation degree of difficulty is little, do not need too many work experience, operating personnel's working strength has both been reduced, the safety of its maintenance has also been guaranteed.

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

3. The vacuum circuit breaker achieves the purpose of good protection effect by arranging the buffer device, the movable conducting rod, the lifting plate and the like, when electric arc release is needed, the movable conducting rod is often required to be pushed to move upwards and then is rapidly contacted with the static conducting rod, the electric arc release process is often slow in the existing structure, the subsequent rebound of the structure is not rapid enough, the electric arc is easily pulled and extended, and accidents are easily caused, the buffer device is arranged at present, when the movable conducting rod is contacted with the static conducting rod under the action of external force, the lifting plate drives the movable conducting rod to ascend, meanwhile, the spring and the tension spring at the lower end are pulled and extended under the driving of the lifting plate, the spring and the tension spring at the upper end are extruded together, after the electric arc release of the movable conducting rod and the static conducting rod is completed, the force at the lower end can rapidly disappear, the rebound force accumulated in the buffer device begins to be released, then the whole lifting plate can quickly return to the initial position, and the safety of a user can be ensured.

Drawings

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

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

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

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

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

FIG. 6 is a schematic view of a structural cushioning device according to the present invention.

In the figure: 1. a ceramic cylinder; 2. an inner barrel; 3. an arc extinguishing chamber; 4. a stationary end conductive plate; 5. a bayonet; 6. a protective shell; 7. a sheet metal groove plate; 8. a gasket; 9. a water stop ring expanding when encountering water; 10. a top cover; 11. fixing the 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. moving the cartridge; 183. a limiting block; 184. a spring; 185. a fixed block; 186. a tension spring.

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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Please refer to fig. 1-6, a vacuum circuit breaker, including a ceramic cylinder 1, an inner cylinder 2 is sleeved inside the ceramic cylinder 1, an arc extinguish chamber 3 is opened inside the inner cylinder 2, a stationary end conductive plate 4 is fixedly installed on the top of the inner cylinder 2, a bayonet 5 is opened on the top of the stationary end conductive plate 4, a protective shell 6 is fixedly installed on the top of the inner cylinder 2, a sealing gasket 8 is fixedly installed on the middle of the bottom of the protective shell 6, a metal plate groove plate 7 is fixedly installed on the top of the sealing gasket 8, a water-swelling water stop ring 9 is movably clamped on the middle of the top of the protective shell 6, a top cover 10 is movably clamped on the top of the protective shell 6, a fixing bolt 11 is fixedly installed on the top of the top cover 10, a stationary conducting rod 12 is fixedly installed on.

Wherein, 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 installed with a lifting plate 15, the bottom of the lifting plate 15 is fixedly installed with an electric wire 16, the bottom of the lifting cylinder 14 is fixedly welded with a base 17, the middle part inside the lifting cylinder 14 is fixedly installed with a buffer device 18, when the opening and closing operation is needed, the movable conducting rod 13 is often pushed to move upwards and then is rapidly contacted with the static conducting rod 12, thereby realizing the release of the electric arc, the existing structure is often slow in the electric arc release process, the subsequent rebound of the structure is not rapid enough, the electric arc is easily pulled and extended, accidents are easily caused, the buffer device 18 is 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, when the lower end action force disappears, at this time, the buffer device 18 starts to rebound rapidly, so that the movable conducting rod 13 and the static conducting rod 12 are separated, the rebound speed is very fast, and the safety of a user can be ensured.

Wherein, the buffer device 18 includes a fixed ring 181, the two ends of the front of the fixed ring 181 are fixedly installed with a movable box 182, the inner part of the movable box 182 is movably clamped with a limit block 183, the inner side of the limit block 183 is fixedly installed with a spring 184, the middle part of the right end of the movable box 182 is fixedly installed with a fixed block 185, the upper and lower ends of the fixed block 185 are fixedly installed with a tension spring 186, the fixed ring 181 is movably clamped at the middle part of the inner part of the lifting cylinder 14, the whole buffer device 18 has a very simple structure, mainly fixed in the lifting plate 15 by the spring 184, when the lifting plate 15 is moved by external force, the spring 184 and the tension spring 186 which are originally kept balanced will be changed, but because the external acting force is too large, at this moment, there is no way to release the elasticity, when the bottom action disappears, at this moment, the spring 184, meanwhile, the movable conducting rod 13 can be quickly pulled back, so that the resilience of the structure is realized, and the resilience speed is fast and has a good effect.

Wherein, the static end conductive plate 4 is a structure formed by a disc, a circular truncated cone and a semi-sphere in an integrated manner, the bottom of the static end conductive plate 4 is movably clamped with a static conductive rod 12, a fixing bolt 11 sequentially penetrates through a top cover 10, a water swelling water stop ring 9, a sealing gasket 8, a sheet metal groove plate 7 and a protective shell 6 from top to bottom and is in threaded connection with the inside of a bayonet 5, the circuit breaker needs to check the internal structure after being used for a period of time, and can effectively work when being used subsequently, but the previous disassembly structure is too complicated and troublesome, basically, all the components are completely disassembled, the inside is conveniently observed, the sealing protection of the protective shell 6 at the top is matched by utilizing the sleeving connection of the inner cylinder 2 and the ceramic cylinder 1, the sealing capability of the protective shell 6 at the top can be ensured to be consistent with the conventional structure, but the structure is very convenient and easy when being disassembled and, only need pull down bolt and fixing bolt of upper and lower extreme, the inside structure of whole explosion chamber 3 can both be taken out and observe, and it is very convenient easy to use.

Wherein, the top of a pottery section of thick bamboo 1, the top and the protective housing 6 of inner tube 2 adopt bolt threaded connection, and the bottom of a pottery section of thick bamboo 1 and inner tube 2 all adopts bolted connection, vacuum circuit breaker structure in the past is sealed effectual in order to guarantee, often adopt the integral type shell, and need structure parcel layer upon layer to live, this structure just needs to dismantle layer upon layer when dismantling, one can increase operating personnel's working strength, whole equipment often belongs to the high altitude installation in addition, dismantle inconvenient operation completely with it, operating personnel also do not have corresponding region to provide and place, there is certain danger in the maintenance inspection, set this pattern now, only need open the bolt and just can directly take out inside explosion chamber 3 and observe, both convenient quick maintenance, and is also very safe simultaneously.

The number of the fixing rings 181 is two, the movable box 182 is a C-shaped structure, the limiting block 183, the fixing block 185 and the tension spring 186 are all inside the movable 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 the arc release is needed, the lower end structure starts to apply upward force to the lifting plate 15, the lifting plate 15 can compress the upper end spring 184 and the tension spring 186, but the clamping lower end structure of the limiting block 183 can only be elongated, the force of the spring 184 and the tension spring 186 can be extruded together, the force is not released easily due to external force, after the contact of the dynamic and static conductive rods 12 is completed, the force applied to the lower end disappears, the force of the spring 184 and the tension spring 186 is released quickly, and then the whole structure can be reset quickly, so that the safe use of the.

Wherein, the fixed welding in middle part at 6 tops of protective housing has two joint rings, in the joint ring including water inflation seal ring 9 is placed, two annulars have been seted up to top cap 10's bottom, two annulars respectively with two joint ring looks adaptations, can enough realize holistic effective demolising in order to guarantee the upper end structure, realize simultaneously sealed effectual purpose, with the form of adopting the joint between each sealing member of upper end this moment, the infiltration of vapor and outside air can be avoided to a plurality of tongue and groove cooperation joints.

The working principle is as follows: when the device is used, when an electric arc of the device needs to be released, at the moment, the external environment begins to apply pressure to the inside, then the base 17 begins to apply an extrusion force upwards, meanwhile, the lifting plate 15 and the movable conducting rod 13 begin to move upwards, meanwhile, the spring 184 and the tension spring 186 at the lower end are pulled and extended 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 in contact to release the electric arc, the force at the lower end can quickly disappear, the rebound force accumulated in the buffer device 18 begins to be released, then the whole lifting plate 15 can quickly return to the initial position, and the whole process of releasing the electric arc is finished.

It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 is to 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", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the present invention. In the drawings of the present invention, the filling pattern is only for distinguishing the layers, and is not limited to any other way.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments 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. A vacuum circuit breaker comprising a ceramic cylinder (1), characterized in that: an inner cylinder (2) is sleeved in the ceramic cylinder (1), an arc extinguish chamber (3) is arranged in the inner cylinder (2), a static end conductive plate (4) is fixedly arranged at the top of the inner barrel (2), a bayonet (5) is arranged at the top of the static end conductive plate (4), a protective shell (6) is fixedly arranged at the top of the inner barrel (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 top of the sealing gasket (8), a water swelling water stop ring (9) is movably clamped at the middle part of the top of the protective shell (6), a top cover (10) is movably clamped at the top of the protective shell (6), a fixed bolt (11) is fixedly arranged at the top of the top cover (10), the upper end inside the inner cylinder (2) is fixedly provided with a static conductive rod (12), and the lower end inside the inner barrel (2) is movably clamped with a movable conducting rod (13).

2. A vacuum interrupter as claimed in claim 1, characterized in that: the bottom fixed welding of a pottery section of thick bamboo (1) has a lift section of thick bamboo (14), the bottom fixed mounting who moves conducting rod (13) has lifter plate (15), the bottom fixed mounting of lifter plate (15) has electric wire (16), and the bottom fixed welding of a lift section of thick bamboo (14) has base (17), the inside middle part fixed mounting of a lift section of thick bamboo (14) has buffer (18).

3. A vacuum interrupter as claimed in claim 2, characterized in that: buffer (18) including solid fixed ring (181), gu the equal fixed mounting in fixed ring (181) positive both ends has removal box (182), the inside movable joint that removes box (182) has stopper (183), the inboard fixed mounting of stopper (183) has spring (184), the middle part fixed mounting that removes box (182) right-hand member has fixed block (185), the equal fixed mounting in last lower extreme of fixed block (185) has extension spring (186), gu fixed ring (181) movable joint is at the inside middle part of a section of thick bamboo (14).

4. A vacuum interrupter as claimed in claim 1, characterized in that: quiet end current conducting plate (4) are by disc, round platform and semicircle ball integrated into one piece structure, and the bottom activity joint of quiet end current conducting plate (4) has quiet conducting rod (12), fixing bolt (11) are followed and down run through top cap (10), water swelling seal ring (9), sealed pad (8), panel beating frid (7) and protective housing (6) and threaded connection in the inside of bayonet socket (5) in proper order.

5. A vacuum interrupter as claimed in claim 1, characterized in that: 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 bottom of the ceramic cylinder (1) and the bottom of the inner cylinder (2) are in threaded connection through bolts.

6. A vacuum interrupter as claimed in claim 3, characterized in that: the number of the fixing rings (181) is two, the movable box (182) is of a C-shaped structure, the limiting blocks (183), the fixing blocks (185) and the tension springs (186) are all in the movable box (182), and the upper end and the lower end of each spring (184) are fixedly connected with the periphery of the lifting plate (15) and the inner wall of the limiting block (183) respectively.

7. A vacuum interrupter as claimed in claim 1, characterized in that: the middle part fixed welding at protective housing (6) top has two joint rings, meet joint ring including water inflation stagnant water ring (9) are placed, two annulars, two have been seted up to the bottom of top cap (10) the annular respectively with two joint ring looks adaptations.