NO760420L

NO760420L -

Info

Publication number: NO760420L
Application number: NO760420A
Authority: NO
Inventors: E Hellman; T Olsson; A Van Santen
Original assignee: Asea Atom Ab
Priority date: 1975-02-12
Filing date: 1976-02-10
Publication date: 1976-08-13
Also published as: NL7601035A; DE2603732A1; FR2300930A1; JPS51132361A; DK51876A; BE837994A; FI760200A; SE7501544L

Description

Oppfinnelsen angår en låsbar mutteranordning omfattendeThe invention relates to a lockable nut device comprehensively

en mutter (eller et bolthode) og et låseorgan som ved tilskrudd mutter omslutter mutteren og har begrenset vridningsfrihet i forhold til denne. a nut (or a bolt head) and a locking device which, when the nut is screwed on, encloses the nut and has limited freedom of rotation in relation to it.

En låsbar mutteranordning ifolge oppfinnelsen er særlig beregnet for brenselpatronene i en kjernereaktor. Muttere som inngår i en brenselpatron må være låst på en absolutt pålitelig måte. Det er dessuten viktig at muttere som inngår i sammen-holdende organer for. en'brenselpatron skal kunne losnes lett, .også når man på grunn av bestrålingen er tvunget til å benytte fjernmanovrert verktoy, f.eks. med patroner som er nedsenket A lockable nut device according to the invention is particularly intended for the fuel cartridges in a nuclear reactor. Nuts included in a fuel cartridge must be locked in an absolutely reliable way. It is also important that nuts which are part of cohesive bodies for. A fuel cartridge must be able to be removed easily, also when, due to the radiation, one is forced to use remotely operated tools, e.g. with cartridges that are submerged

tre meter■under vannflaten i et brenselforvaringsbaseng. three metres■below the water surface in a fuel storage basin.

Oppfinnelsen er kjennetegnet ved de trekk som er angittThe invention is characterized by the features indicated

i patentkravene, og.skal i det folgende beskrives nærmere under, henvisning til tegningen som viser forskjellige, for en brenselpatron anvendbare utforelsesformer ifolge oppfinnelsen. in the patent claims, and shall be described in more detail in the following, with reference to the drawing which shows different embodiments applicable to a fuel cartridge according to the invention.

Flg. 1 viser i vertikalriss ca. l/ h av en i en koker-reaktor inngående brenselpatron. Fig. 2 viser et. vertikalsnitt etter linjen II-II på fig. 1, og fig. 3 viser ,en detalj av den på fig. 1 og 2 viste anordning. Fig.. h og 5 viser dels i side-riss, dels i vertikalsnitt to ytterligere utforelsesformer av oppfinnelsen, anvendt ved den på fig. 1 og 2 viste, brenselpatron. Follow 1 shows in vertical view approx. l/h of a fuel cartridge included in a boiler-reactor. Fig. 2 shows a vertical section along the line II-II in fig. 1, and fig. 3 shows a detail of the one in fig. 1 and 2 shown device. Figs. h and 5 show, partly in side view, partly in vertical section, two further embodiments of the invention, used in the one in fig. 1 and 2 shown, fuel cartridge.

På tegningen betegner 1 hylsteret eller kappen for brenselpatronen som har en gitterformet topplate 2. Brensel- . patronen inneholder fire bærende brenselstaver 3'hvis ende-plugger er betegnet med h- og forsynt med hver sin mutter som In the drawing, 1 denotes the casing or jacket for the fuel cartridge which has a grid-shaped top plate 2. Fuel- . the cartridge contains four load-bearing fuel rods 3' whose end plugs are denoted h- and each provided with a nut which

på fig. 1, 2 og 5 er betegnet med 5. Mutteren 5 er i'den påon fig. 1, 2 and 5 are denoted by 5. The nut 5 is on

fig. 1, 2, 3 og også i den på-fig. 5 viste utforelsesform av oppfinnelsen utformet med et aksialt ytre sylindrisk parti 6 og et med dette sammenhengende aksialt indre sylindrisk parti 7 fig. 1, 2, 3 and also in the on-fig. 5 showed an embodiment of the invention designed with an axially outer cylindrical part 6 and a connected axially inner cylindrical part 7

som i likhet med partiet 6 har regulært polygonalt tverrsnitt, which, like lot 6, has a regular polygonal cross-section,

idet partie.t 7 har mindre tverr snitt sf late enn partiet 6. Mutteren 5 er på fig. 1 og 2 låst ved at partiet 7 er i inngrep med et fjærende skrunokkelliknende organ 8 som inneholder en arm 9 som er utfort som en bladfjær og i sin ene ende er for- in that partie.t 7 has a smaller cross-section sf late than partie 6. The nut 5 is in fig. 1 and 2 locked in that the part 7 engages with a springy wrench-like member 8 which contains an arm 9 which is extended like a leaf spring and at one end is

synt med en ring 10. Ringen 10 har en utskjæring eller uttag-connected with a ring 10. The ring 10 has a cut-out or

ning 13 med sekskantet hegren-sningsflate, hvorved to parallelt med armen rettede sekskant sider er lengre enn-de ovrige. To for hver sin mutter anordnede armer 9 er sammenbygget med et felles fjærende organ 11, som er festet til topplaten 2 for en ning 13 with a hexagonal hedging surface, whereby two hexagonal sides directed parallel to the arm are longer than the others. Two arms 9 arranged for each nut are assembled with a common springy member 11, which is attached to the top plate 2 for a

brenselpatron på samme- steder som fjærene 12 s.om er beregnet å ligge an mot en ovre gitterplate i reaktorkjernen. Hver av. fuel cartridge in the same places as the springs 12 etc. which are intended to rest against an upper grid plate in the reactor core. Each of.

armene 9 danner en spiss vinkel a med horisontalplanet, idet vinkelen a er hoyst 1.5°. Aksialt innenfor mutterpartiet 7 the arms 9 form an acute angle a with the horizontal plane, the angle a being at most 1.5°. Axial within the nut section 7

finnes et sirkulært mutterparti l^- for hvilket ytterdiameteren er mindre enn den minste diameter av åpningen 13. I den pa fig. 2 viste stilling av den fjærende arm 9 er uttagningen 13 there is a circular nut part 1^- for which the outer diameter is smaller than the smallest diameter of the opening 13. In the one in fig. 2 shown position of the resilient arm 9 is the outlet 13

i sin fremkant fastkilt mot mutterpartiet 7. Dersom armen 9wedged at its leading edge against the nut part 7. If the arm 9

hadde kunnet innstille seg i spenningslos stilling, ville vin-' kelen a ha blitt betydelig storre. Når mutterlåsningen'skal oppheves omsluttes mutteren 5 av en hylsenokkel som'er til-strekkelig dyp t.i-1 å kunne nå ned til underkanten av mutterpartiet 7. For muttervridningen påbegynnes, utover man ved hjelp av hylsenokkelen en så stor aksial kraft på det' fjærende organs 11 ring 10 at ringen 10 bare omslutter det neddreide mutterparti lh. Dette oppnås uten at det fjærende organ 11 blir utsatt for deformasjon utenfor sitt elastiske område. had been able to adjust to a tension-free position, the angle a would have been considerably larger. When the nut locking is to be lifted, the nut 5 is enclosed by a sleeve key which is sufficiently deep to be able to reach down to the lower edge of the nut part 7. To start turning the nut, one uses the sleeve key to exert such a large axial force on the springy organ 11 ring 10 that the ring 10 only encloses the lowered nut part lh. This is achieved without the springy member 11 being exposed to deformation outside its elastic range.

I den på fig. 5 viste utforelsesform a.v oppfinnelsen anvendes individuelle fjærende organer 15 med forholdsvis kort fjærende arm. In the one in fig. 5 shown embodiment of the invention, individual springing members 15 with a relatively short springing arm are used.

I den på fig. h viste mutteranordning oppnås en slark-eller- klaringsfri forbindelse mellom det fjærende låseorgan og mutteren 16 ved at denne er utfort som' en sekskantet, avkortet pyramide. In the one in fig. h shown nut arrangement, a slack- or clearance-free connection is achieved between the springy locking member and the nut 16 by the fact that this is designed as a hexagonal, truncated pyramid.

En låsbar mutteranordning ifolge oppfinnelsen kan ut-fores på mange forskjellige måter i- tillegg til de på tegningen viste. F.eks. kan en ring av tilnærmet samme form som ringen 10 på fig. 3 understottes eller bæres oppe i låsestilling ved hjelp av et antall i hver sitt vertikale ror lagrede, skrue-linjeformede fjærer. A lockable nut device according to the invention can be designed in many different ways in addition to those shown in the drawing. E.g. can a ring of approximately the same shape as the ring 10 in fig. 3 is supported or carried up in the locked position by means of a number of spiral-shaped springs stored in each vertical rudder.

De på tegningen viste konstruksjoner er særlig egnetThe constructions shown in the drawing are particularly suitable

når det benyttes fjernmanovrert verktoy. De har dessuten den fordel at de bare i liten grad medforer noen okning av reaktor-kjernens gjennomstromningsmotstand. when remotely operated tools are used. They also have the advantage that they only lead to a small increase in the flow resistance of the reactor core.

Claims

1. Lockable nut device comprising a nut or the like and a locking device which, when the nut is screwed on, encloses the nut and has limited freedom of rotation in relation to it, characterized in that said locking device is elastically deformable under the influence of a compressive force acting along the nut's center line when this is transmitted by using a sleeve key which encloses the nut and is intended for twisting it, as the elastic deformation involves such a large axial movement of the locking member in relation to the nut that the locking member ceases to engage with it.

2. Device according to claim 1, characterized in that said locking device contains an elongated leaf spring which in the locking position encloses the nut with its free end and forms an acute angle with a plane oriented perpendicular to the nut axis.

3. Device according to claim 1, characterized in that the nut is designed with a front, for engagement with a. wrench intended part, and with an axially lying within this, second part which is intended for engagement with the locking member, the said first part having a larger maximum diameter than. the said second party. k. Device according to claim 1, 'characterized in that the nut is designed with an axial inner part which is' .designed to be able to be enclosed by the aforementioned locking device while the nut is being turned without engaging with it.