DE2241108C2 - Device for contactless detection of the speed of a rotating body - Google Patents

Description

acceptance

The invention relates to a device for contactless detection of the speed the surface of one provided with Koiurastemarks Rotary body, in particular the rotor of a gas centrifuge, with a light guide rod, one end face of which opposite the contrast marks.

In the case of bodies of revolution one then uses contactless Measuring sensors if mechanical contact affects the synchronism of the moving parts would. With gas centrifuges in particular, every mechanical contact with the Centrifuge centrifuges are avoided. This Zcntrifugcntrommcl is usually stored without contact in magnetic fields, with natural oscillation movements performs.

It has now been found that measurements such as those proposed in German Offenlegungsschrift 110017, for example, are not sufficient to draw sufficient conclusions about very complex movements in some cases. With gas centrifuges, for example, it is not possible to draw conclusions about the movements of the entire Schlcudertrine from one measuring point! to pull: it is even inadmissible to take measurements of the position and movement of the surface of the centrifugal drum at separate points, since the twisting of the

^a) S / SrSögüch ^; te when trying to! onderV IHstfee risk of confusion, as well as that

"!! consuming and precise allocation of the individual measuring points to one another is no longer necessary because a fixed, structurally unified measuring device is no longer necessary.

NIE "maybe that the spatial assignments Zw ₁ sl! Ge ^ chwindiskeits- and distance measurement are interchangeable same everywhere, c) there eder each measuring point irsbesondere any 'From tandsmeßstellc a defined position has to be allocates, in particular the bauiche matching brings an essential HChE Reduction of the precisely arranged Auflagestcllen'der measuring probes, and

, η ϊί in front of housings, especially ^{housings exposed to pressure}} individual moving Te ₁ Ie. In particular, rotary bodies such as gas centrifuges such as these require measurements, is one with every probe. Weakening of the loaded housing _wl "jun. connected, especially be, gas / enrUiecn where the casing Js armoring has to protect _{the surroundings from the gaps in the crack, for example from bursting 7f} Ji, Sc ^{r bl.nMlertrummeln.}

Fine "'summary of related points / u of a single structural unit b ct-t the possibility of weakening the housing wall with fewer openings than was previously possible.

In the interior of the invention, sensors for distance and / or temperature are provided, since these are sensors that are not subject to wear and tear, such as P, photocell and lightbulb on the ., it makes sense end of the optical fiber arranged Abtnstciiihcil, sc in the area 3cs optimum Abs.andes / moving to I _n eil to br.n- Z where they obtain the best possible because it is Mcßinformat.onen möelich, from the object to be measured substantially These sensors, which are grouped at the end of the fiberglass rod, are used to measure temperature and / or distance, and they have a capacitive or inductive effect when measuring the distance, while thermocouples, thermistors, and NTC resistors are used as temperature sensors or the like are arranged. since the Warmeverlau for the behavior of a moving part is mitbedeutend but as it en particularly in Gaszcntnfugenanla- _K inferences about static within the centrifugal drum t finding separation processes, is the assignment of temperature sensors to the invention

A further advantage of the invention according to the measuring unit.

In a further embodiment of the invention, at least the one used to measure the distance is Sensor arranged in a ring around or in front of the light guide rod. The particular advantage of this Another refinement is that the distance measurement is representative of the exact on the Velocity measuring device is present distance. Here, the light guide rod does not have to be the in Penetrate the distance measuring sensor aperture-like opening, what possibly the for a capacitive distance measurement would disturb the necessary uniform dielectric constant.

In a further embodiment of the invention, the sensor and light guide rod receiving unit is sealingly introduced into a wall surrounding the rotating body, on one side of the wall facing the rotating body, the measuring sensors are located, with light guide slab and signal lines emanating from the ao sensors within the unit penetrate the wall gas-tight and in the form of coupling halves enr ^J en. Particularly in the case of gas centrifuges, a particularly good seal of the structural unit carrying the measuring elements is necessary; (All of the conductors of measurement signals run inside the unit, so that they do not have to penetrate the wall again in a sealing manner The entire assembly without needing to be replaced or sealed separately.

According to a further embodiment of the invention Jer distance between sensors and rotating body is changeable: so it is z. B. at dormant The centrifugal drum of a gas centrifuge is possible, a standard signal for the stationary distance between the sensor and adjust the centrifugal drum: otherwise it is also a very coarse one with high tolerances afflicted, cheap manufacturing process enabled. Besides that enables a measuring unit adjustable during operation to run through larger measuring ranges, e.g. B. the mean temperature radiation of a larger or smaller area. Only one light citizen allowed in this case a simple structural design, since it is essentially distance-independent speed measurements enables.

The invention finds a particularly expedient application in gas centrifuges, the armored ones and sealing recipient structures are where the recipient wall receives one or more measuring devices, the precise information about the current position of the centrifugal drum

Execution * - and application examples of the invention can be found in the figures; it represents (\ άτ

F i g. i the elevation through part of a gas centrifuge, the measuring device according to the invention is introduced into the recipient wall,

2 and 4 show a measuring unit in elevation,

F i g. 3 and 5 the in F i g. 2 and 3 shown measuring unit in front view.

In Fig. 1, the part of a centrifugal drum 13 is shown schematically, which rotates in the recipient 14, in which the probe according to the invention is introduced through a bore. The probe is provided with a flange 1, where it is fastened by screws 2 to the wall 14, the so-called recipient. The gas seal is taken over by an O-ring 3. The probe 5, which has a sensor for temperature and distance 7, is taken from an insulator 4. The contrast mark 8 is scanned through a central hole in the probe via a light guide rod 11. The light guide rod 11 is glued in cas-tight and additionally sealed by an O-ring 12. The photo scanning head 9 is exchangeable. The distance and temperature signals are fed to the gas-tight cast coupling halves 10 of a multiple plug connection. The distance χ between the probe and the centrifugal drum can be changed by placing seals under the flange.

F i g. 2 shows a probe 5 in elevation; it contains a ^ measuring sensor 15 for capacitive distance measurement, into which a diaphragm-like center hole: 19 is inserted is. A temperature sensor 16 is insulated on the measuring sensor 15. At the back the probe 5 is an insulated, possibly slotted tube with which the probe 5 in a hole in the flange 1 is covered. A pre-mirrored surface 18 protects the probe from radiation from the recipient 14.

F i g. 4 shows an inductive distance measuring sensor 20 which is arranged as a coil around a pipe section representing the diaphragm. This measuring sensor 20 is separated concentrically by three insulators 21 from a likewise ring-shaped temperature radiation sensor 22, which communicates the heat it has absorbed to the temperature sensor 23.

For this purpose 2 sheets of drawings

Claims (5)

Patent claims: 1. Performing the non-contact detection of the speed of the surface of one with Rotary body provided with contrast marks, in particular the rotor of a gas centrifuge a light guide rod, one end face of which is opposite the contrast marks, characterized in that in the immediate movement rich of this end face sensor (6, 7) arranged for further measured variables of the rotating body (13) are. 2. Device according to Claim 1, characterized in that measuring sensors (6, 7) for measurement of distance and / or temperature are provided. 3. Device according to claims 1 and 2, characterized in that at least the probe ν. ', 15, 20) is arranged for measuring the distance annularly around the rod or before Lichtieiter- (11). 4. Device according to claims 1 to 3, characterized in that the measuring sensor (6, 7) around the light guide rod (11) receiving structural unit in a wall (14) surrounding the rotating body (13) is sealingly inserted, on one side of the wall facing the rotating body the measuring sensors (6, 7) are located and that the air conductor rod and the signal lines emanating from the sensors penetrate the wall tightly within the structural unit and end in the form of coupling hats (10). 5. Device η, ch a.-.- »of claims 1 bis4, characterized in that the Absiand between sensors (6. 7) and rotating body (13) can be changed. Centrifugal drum surface must be recorded by measurement. It is now an invention • ^A , rShS L find the at least ab ^em ^ nH velocity measurements on the contact surface of a moving area S ^ht The object is according to the invention οΙ that in the immediate area this measuring sensor for further measured variables of the AA for not exposed