DE1946540C3 - - Google Patents

Description

The invention relates to a drive arranged in a housing for an absorber rod, which directly from above into the bed of a nuclear reactor consisting of spherical operating elements penetrates. Such a drive is known from German Patent 1,263,940; the drive this straight dipping rod takes place via an endless chain drive, so that the absorber rod can only perform axial movements. The entry of the rod into the bed is therefore only possible with great expenditure of force, which adversely affects the spherical operating elements as well as the Graphite internals affects.

Another device for generating rectilinear controlled movements is from the German Auslegeschrift 1184 865 known, with which also an absorber rod for controlling a nuclear reactor

ίο is to be actuated. The absorber rod represents the the lower section of a driven part that has a screw-nut system with an intermediate part forms. The driven part is provided with roller bearings and the rollers mounted on it run

in longitudinal grooves of the envelope wall. Through this axial guidance, the driven part is together with the Absorber rod forced to perform a longitudinal movement when the intermediate part of the screw-nut system (which represents the screw) in rotary

ao movement is displaced. The drive of the intermediate part takes place via a drive shaft, the lower part of which is designed as a grooved shaft, and a corresponding one Grooves in the intermediate part rotatably connected to this is. Also this known drive device

as only allows a straight movement of the absorber rod and is therefore in connection with a nuclear reactor described at the outset with the suffers from the disadvantages already outlined.

It is also known from German patent specification 1 154 883 for actuating an absorber rod for nuclear reactors to design this tubular and to provide it with an internal thread, see above that by turning an actuating tube provided with a corresponding external thread, which is in the absorber rod reaches in, can be raised or lowered. The actuating part in turn is via longitudinal grooves made in its interior through a correspondingly grooved drive shaft in Rotational movement offset, and the drive shaft is driven by an epicyclic gear. Also this absorber rod can only perform longitudinal movements, and its drive is therefore for the insert in a pebble bed reactor, in which the absorber rods directly into the bed of the operating elements are not suitable for the reasons already mentioned.

The German Auslegeschrift 1 123 057 describes a device for longitudinally displacing an absorber rod in a nuclear reactor, in which the absorber rod is designed in a helical manner and can perform both longitudinal and rotary movements. However, the longitudinal movement is firmly coupled with the rotary movement; that is, a certain rotational movement of the rod inevitably causes a simultaneous longitudinal movement, the size of which is independent of whether it is an upward or downward movement of the rod. The fixed coupling of the longitudinal and rotary movement of the absorber rod makes it possible to provide the rod locks required for the reactor control c / instead of the longitudinal movement for the rotary movements. It is also with an absorber rod driven in this way, which is also a LUi. ₆ s and rotary movement and is also designed in a helical manner, it is already possible to loosen the bulk of the spherical operating elements and thereby reduce the stress on the balls and the graphite internals.

<t

Proceeding from this state of the art, Hegt the invention is based on the object of providing a drive for a directly from above into the spherical

it was found to be a favorable value ew » _for the extension process

^ _{{ eg}

_p ^. _h ^& _iebebüchse . .

a ^ H Kugf _{and show 2)} t _ei NEN Langs-

De ^ ⁿ ^ _us 4rungsbeispiel of the Invention ^schn ^ "^^ ^ Lo erstabantriebes. In Gehausei be ^ shaft 2, the lower part of 3 is that duich em rotation JS ^ ^^ gigselement 4 hindurchgefuhrt st ^m 7 ^e _D f ~ _{om ntü} Wragungselernent 4jrij «Used as uremu. The spherical cmeoe

hb ^ hse shift in axial direction

Tl 5 vjrbun

between the longitudinal and the rotary movement, see S ^ e <ler Ji nut pitch arranged

According to the invention, the object is accordingly a ^ r ι ball bearing rollers

The lower part of a diffabarea drive- ^ * ™ _{- 3} rollers and mammal shaft designed as a grooved shaft and positioned by a rotary so that α ^ _the lifting screw rather, torque transmission element is carried out a slidable in the axial direction and rotatable 15 ^ _{^ nra _{carried vort} eilhafterwei bares tubular member drives, to which the lower ^ ^{0 "to"} end ^and a helically formed absorber rod is arranged in the region of the periphery of the Drehmomentfibertralungselementes rohrfömugen
Part of a freewheel is arranged, which when down *>
move the absorber rod into the ball bed
into a lifting screw arranged around this freewheel
engages, the thread with an on the inner circumference 7 _D

of the housing provided mating thread m as u
SduigÄdaß'im area de ^S s torque exercise,, 5 Kugesch, e ^^ ^ axial direction

support element another freewheel on the circumference bush 4 » _rehbaren tubular part 5 vjrbun

^g is provided the tubular part of the cash be.m sow or ^ ^ helical shape, ^

Moving the absorber rod out of the ball end is arranged _{on the cross rod 6.} At the

pouring an intermediate piece in rotation, ^a ^ g ' ^d J _hfö shaped part 5 irr, area of the

which is loosely mounted on the tubular part. wob «

the intermediate piece engages in a gear that is non-positive is in communication with the lifting screw.

The absorber rod drive according to the invention has Compared to the state of the art, it has the advantage of having a higher absorber rod when retracting and extending

with a different ratio of turning to

Lifting speed can be operated during

the rotary movement directly from the motor to the axial

movable and rotatable tubular part and

is thus also transferred to the absorber rod,

is the simultaneous stroke movement by the with

a flat thread with pitch ft.

screw secured. Depending on the direction of rotation of Motos (A bz ⁸ w extension of the rod), the jackscrew either via a first ^ freewheel directly or via a second Fre.lauf and em ^ - rib That is, a different

driven directly or via a second freewheel and em ^ drive. By a different Steigu .. ₆ of the "Hubschrauben- and the absorber rod-U;> I. where H is the slope of the ex

sorber bar means) with the same drive speed, the absorber tab when retracting the bar a different speed in the longitudinal movement (V ₁₁ = lifting speed) and the scraper _{bar 6 is} arranged. On the _tubular part 5 irr, area of the ^ ^ _two freewheels 7 and 8 _{u { η g ht} d'.rekt nut an «

9 in connection, whose thread 1 in ^ ^ ^ _by ball bearings

t, which on the inner circumference of the Gejh det we ^ , ^ ^ grdtm.

House 1 -, ^ g s _spacers 12 a, on the overleaf ^ "^ ^ _{Getriebc angeord} The net

andeorSj ¹ '™ ^e, _{in turn,} clamped with teHub-GetneJ. 1 * _The axially aligned

^ Ve _{are m} Axialfühmngen gefuh ^■ 3Γ _Laufro cases 14 are made and within ^ ^a _"angeO rdnete runners 15 eindes uermu *

8 ^ _{^n-working apparatus} et as follows: Depending on DRCH-JJ front _'the Kugelschuttung antormige go _out to retract the "^ _{J is d} schraubennduung α ^ _6?.".

rfta ^ ^ ball debris you will.

^ ₌ the ^ wave 3 di _; ect on ^ KugeT-

Torque width., Auflas tube «part 5 ^ 0-like on de" Agorber rod ^ ^ g _η

oewegu S * _{T ng} is connected and the stroke £ f * ^ ¹ _{The axial} displacement of the pipe

It is up to the skilled person to choose the most favorable ratio φ for both the retraction and the extension process in order to keep the load on the operating elements and the graphite structures as low as possible.

Λ Hubs ^ _{the freewheel} 7 works that

rather _s ^ ¹ B ^ _{n and the} gear 13, which engages Jjjgnenjg <= ^ ₉ . J _e according Drelv

directly ^ ^ ^ of _{the two Fre] Iaufc 7 or}

_Le erlauf switched.

Here? "1 sheet of drawings

Claims (7)

Patent claims: 1. Drive arranged in a housing for an absorber rod, which is directly from above into the consisting of spherical operating elements Penetrating bulk of a nuclear reactor, characterized in that the lower part of a rotatable drive shaft (2) as Splined shaft is formed and passed through a torque transmission element (4), which drives an axially displaceable and rotatable tubular part (5) on whose the lower end of a helical absorber rod (6) is arranged that in the area of the torque transmission element (4) on the circumference of the tubular part (5) a freewheel (7) is arranged, which in the downward movement of the absorber rod (6) in the bed of pebbles a lifting screw (9) arranged around this freewheel (7) engages, the thread (10) of which engages a mating thread (11) provided on the inner circumference of the housing (1) is connected, that in the area of the torque transmission element (4) another freewheel (8) on the circumference of the tubular part (5) is provided, which when the absorber rod (6) is moved out an intermediate piece (i2) set in rotation from the pebble bed, which is placed on the tubular part (5) is mounted, wherein the intermediate piece (12) engages in a gear (13), the frictional with the lifting screw (9) is in connection. 2. Drive according to claim 1, characterized in that the ratio φ of the conveying speed V ₁ . of the helical absorber rod (6) to the lifting speed V _{n of} the lifting screw (9) when the rod is retracted (6) in the spherical heap <i = 1.5 and when extending amounts to. 3. Drive according to claim 1, characterized in that ah gear is a planetary gear is used. 4. Drive according to claim 1, characterized in that the lifting screw (9) is equipped with a flat thread (10), the pitch of which is h - 93 mm. 5. Drive according to claim 1, characterized in that the mating thread (11) of the lifting screw (9) by means of ball bearing rollers arranged in the housing (1) according to the nut pitch is formed. 6. Drive according to claim 5, characterized in that the ball bearing rollers are arranged in such a way are that a minimum of 3 rollers and a maximum of 4 rollers are in engagement with the lifting screw. 7. Drive according to claim 1, characterized in that the torque transmission of the grooved shaft (3) on the tubular part (5) by means of a spherical sliding bushing (4).