DD211638A5 - DIVE MEASURING PROBE FOR MEASUREMENTS IN LIQUID METALS - Google Patents

Abstract

The object of the invention is to simplify the design of immersion probes while reducing their cost and reducing mass. The aim is achieved by the fact that the measuring head consists mainly of a metal tube, which is surrounded over the greater part of its length by a refractory or heat-resistant material stapled to the tube, with the outer surface of this case sealingly sealing off into the first the outermost end of the metal tube is guided, which is closed by a bung carrying one or more measuring elements and the other outermost end of the measuring head or metal tube is pushed into an outermost end of the tube made of cardboard or the like.

Description

/ HH ^ / '-H Κ _ -1 - Berlin, the 2O ₀ 2 »84

Feus' i ^ Si ₅ B? - ³¹ I ¹ Sv.ji *>., JJ ~~ '

AP G 01 N / 255 543 5 63 059 23

Tauc hmeßson de for measurements in liquid en Me tallen field of application of the invention

The invention relates to a dip probe for measurements in liquid metals, which consists of a tube, the first immersed outer end is closed by a one or more measuring elements supporting plug-shaped measuring head and a matching connection, the tube pushed over an outer end of a hollow support lance is *

Characteristics of the known technical solu tions

For the measurement of, for example, the temperature and / or the oxygen content in a liquid metal immersion probes are usually used, which traditionally consist of a tube whose first immersing extreme end is completed by a pot-shaped measuring head made of refractory material, which carries one or more measuring elements and has a matching connection "the measuring elements are arranged on the side of the measuring head immersed, and the connection to Oer other hand;

In use, such a probe is slipped over a metal support lance, whereby a connection with a arranged in the supporting lance contact block contact. This latter is connected to a measuring instrument via electrical conductors passing through the lance,

63 059 23

W <* J '**'> U ^ rf

The projecting parts of the Meßeletnente are protected in the usual way by mounted on the measuring head cardboard and / or a metal cap, which are destroyed in the immersion in the liquid metal, or melt away *

The known tubes are mostly made of cardboard. Often, such tubes are provided with an insulating protective sleeve to prevent staining and vibration when immersed,

aim the invention

The object of the invention is to simplify the construction of submersible probes while reducing their cost and reducing their mass.

Explanation of the essence of the invention

The invention has for its object, a Tauchmeßsonde for measurements in liquid metals, which is completed by a tube whose first dipping extreme end by a measuring element carrying one or more cup-shaped measuring head and a matching connection, wherein the tube via an outer end of a hollow

Support lance is pushed to create, so that the influence of the measuring elements is reduced to the liquid metal and the accuracy of the measurements is increased.

According to the invention, this object is achieved in that the

63 059 23

4L · * J * J - ^ f '* "$ '" V ^ s) - 3 -

Measuring head consists mainly of a metal tube, which is surrounded over most of its length by a tube attached to the tube of refractory or heat-resistant material, the outer surface of this shell peg-shaped sealingly leads into the first dipping outer end of the metal tube, the is completed by a single or more measuring elements bearing bung and the other outer end of the measuring head or, the metal tube is pushed into an outer end of the tube made of cardboard or the like *

In a preferred embodiment, the metal tube is filled with resin-impregnated but gas-permeable foundry sand through which one or more conductors extend from the sensing element to the other outermost end of the metal tube terminated by a connection.

Another preferred embodiment of the invention provides that the cold tabs of the thermocouple are immersed in a neat filling, such as silicone, which itself is immersed in foundry sand.

In the case that the measuring element is an electrochemical cell with an open extremity, this open end is in the gas-permeable filling,

In another preferred embodiment, the metal tube is used like a conductor to make contact with the liquid metal.

The technical-economic effects, in particular the

63 059 23

psj. ijes jt> © sss aj ^ _r ™

technical progress of the invention consist in the significant reduction of the mass, which is in the vicinity of the measuring elements, whereby the cooling effect on the metal is reduced. This allows more accurate measurement,

The immersion probe according to the invention is further distinguished by the fact that in the case of the application of an electrochemical cell as a measuring element of the influence of the cell is minimized to the measured oxygen concentration and the associated chemical equilibria. If the measuring element is a thermocouple, the temperature difference between the cold tabs of the thermocouples during the immersion or the measurement is reduced.

Another advantage is the simplification of the design while reducing the cost of manufacturing the Tauchmeßsonden

embodiment

The invention will be explained in more detail below using an exemplary embodiment.

In the accompanying drawing, the figure shows an axial section through the Tauchmeßsonde invention,

The probe shown mainly consists of a metal tube 1, which is surrounded over most of its length, by a fixed to the metal tube 1 case 2, the. made of foundry sand, for example.

63 059 23

The outer surface of the shell 2, sealingly leads peg-shaped to the first dipping end 3 of the metal tube 1,

This extremity 3 is sealed by a bung 4 of refractory cement carrying one or more gauges "in this case a thermocouple 5 partially mounted in a quartz tube and an electrochemical cell

The cold tabs 7 of the thermocouple 5 are arranged in a gas-tight filling 8 as silicones and surrounded by a quiver 9 made of plastic, with leaf-shaped cross-section.

The tube 1 is filled with resin-impregnated, but gas-permeable foundry sand 10, in which the open end of the electrochemical cell is located and through which the conductors 11; 12 lead to a connection 13 which terminates the other extreme end 14 of the metal tube 1. At least one of the conductors 11; 12 is provided with an electrical insulating coating.

The tube 1 is used like a conductor to make contact with the molten metal, for example, to close the circuit of the electrochemical cell 6.

A self-holding cap 15 is provided.

A cardboard tube 16 is pushed around the outermost end of the tube 1 against the sheath 2,

63 059 23

vaa -Sg / tv? ^ a- / «ij -f ^ ^^ g", β. »

The dimensions of the shell 2 are, for example but preferably also, the following: length 10 cm; smallest outer diameter (extreme end 3): 2.5 cm; largest outer diameter: 3.7 cm to 4.3 cm); inner diameter: 1.8 cm,

The advantages of such a construction are striking:

- Extremely low mass of materials in the vicinity of Meßelemen te;

- extraordinary protection of the cold flap against mutual temperature difference; favorable form for immersion in the metal;

- Complete protection of the compound and the supporting lance, even if the shell 2 is broken;

- fairly simple, cheap and yet powerful construction,

It is understood that various embodiments can be devised without thereby departing from the scope of the invention.

Claims (5)

53 059 23 Invention claim A submersible probe for measurements in liquid metals consisting of a tube, the first end of which is immersed, terminated by a cup-shaped measuring head carrying one or more measuring elements, and a mating connection, the tube being slipped over an outer end of a hollow supporting lance in that the measuring head consists mainly of a metal tube (i) surrounded over most of its length by a casing (2) of refractory or heat-resistant material attached to the metal tube (1), the outer surface of which 2) pin-shaped sealingly into the first immersed outermost end of the metal tube (1) leads, which is closed by a one or more measuring elements (5) supporting bung (4) and the other outer end of the measuring head it, or the metal tube (i) , pushed into an extreme end of the tube (16) made of cardboard or the like « 2 «submersible probe according to item 1, characterized in that the metal tube (1) is filled with resin-impregnated, but gasdurchlassendem foundry sand (10) through which from the measuring element to the other outermost by a connection terminated end of the metal tube (1 ) one or more conductors (11, 12) extend » 3 * immersion probe according to item 2, the measuring element of which 63 059 23 ^ ₉ * J WW * 4 y ^ j - 8 - is measuring element, characterized in that the cold tabs (2) of the thermocouple (5) in a gas-tight filling (8), such as silicones, are immersed * immersed even in foundry sand (10) » * The measuring element is 4 * Tauchmeßsonde according to item 2 or 3, an electrochemical cell having an open outer end, characterized in that _g that the open end (14) is in aer gas transmitting filling (8) " 5 immersion probe according to item I _1, characterized in that the metal tube (1) is used as a conductor _s to make contact with the liquid metal » - See 1 page drawing -