Direct analysis sampler

Patent metadata

Field	Value
Publication number	US-10352832-B2
Application number	US-201715837130-A
Country	US
Kind code	B2
Filing date	Dec 11, 2017
Priority date	Dec 13, 2016
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

A sampler for taking samples from a molten metal bath, particularly a molten steel bath, includes a sample chamber assembly having a cover plate and a housing. The housing has an immersion end provided with an inflow conduit and including a sample cavity including a distribution zone, an analysis zone, and a ventilation zone. The sample cavity is dimensioned into four contiguous segments each of which has a respective length and depth. The four contiguous segments satisfy the formula: (L 1 /D 1 )+(L 2 /D 2 )+(L 3 /D 3 )+(L 4 /D 4 )>25.

First claim

What is claimed is:

1. A sampler for taking samples from a molten metal bath, the sampler comprising:
a sample chamber assembly having a cover plate and a housing, the housing having an immersion end provided with an inflow conduit and including a sample cavity comprising a distribution zone in flow communication with the inflow conduit, an analysis zone adjacent to the distribution zone, and a ventilation zone adjacent to and downstream of the analysis zone in a flow direction of the molten metal, a portion of the analysis zone overlying the distribution zone,

characterized in that:
a cross-sectional area of the inflow conduit is between 0.5 and 2 times the cross-sectional area of the analysis zone and between 0.20 and 0.70 times a maximum cross-sectional area of the distribution zone,
the analysis zone has a depth of greater than 1.5 and less than 3 mm, and a length and a width selected based upon a predetermined number of analysis spots,
the ventilation zone has a depth of 0.1 to 1 mm, a width equal to or less than the width of the analysis zone, and a calculable length,
the sample cavity is dimensioned into four contiguous segments as follows:
a first segment comprising a first portion of the analysis zone and an underlying first portion of the distribution zone, the first segment having a length L 1 equal to the inner diameter of the inflow conduit and a depth D 1 equal to a sum of the depth of the analysis zone+inner diameter of the inflow conduit+1 mm,
a second segment comprising a second portion of the analysis zone and an underlying second portion of the distribution zone, a bottom surface of the second portion of the distribution zone intersecting a bottom surface of the analysis zone at an angle between 40 and 90°, the second segment having a length L 2 calculable based upon the intersection angle and a depth D 2 equal to the sum of the largest depth of the analysis zone plus depth D1 both divided by 2,
a third segment comprising a remaining third portion of the analysis zone, the third segment having a length L 3 equal to the length of the analysis zone minus the lengths L 1 , L 2 of the first segment and second segment, the third segment having a depth D 3 equal to the depth of the analysis zone, and
a fourth segment comprising the ventilation zone, the fourth segment having a length L 4 equal to the calculable length of the ventilation zone and a depth D 4 equal to the depth of the ventilation zone,

the four contiguous segments satisfy the following formula:
( L 1 /D 1 )+( L 2 /D 2 )+( L 3 /D 3 )+( L 4 /D 4 )>25.

2. The sampler according to claim 1 , characterized in that the sample cavity and the inflow conduit are aligned along a common longitudinal axis.

3. The sampler according to claim 1 , characterized in that there are no increases in a width dimension of the sample cavity after the end of the distribution zone in the flow direction of the molten metal.

4. The sampler according to claim 1 , characterized in that a total length of the analysis zone and the ventilation zone is between 20 and 50 mm.

5. The sampler according to claim 1 , characterized in that the analysis zone has a uniform depth above the distribution zone and the cross-sectional area of the analysis zone gradually tapers in the flow direction of the molten metal.

6. The sampler according to claim 1 , characterized in that a cross-sectional area of the ventilation zone gradually tapers in the flow direction of the molten metal.

7. The sampler according to claim 1 , characterized in that the analysis zone, distribution zone and ventilation zone are structured as a plurality of contiguous segments, each segment having a length to depth ratio, a sum of the length to depth ratios of the plurality of segments being greater than 25.

8. The sampler according to claim 1 , characterized in that the distribution zone, analysis zone and ventilation zone are structured as a plurality of contiguous segments, each segment having a length to depth ratio, the length to depth ratios of the segments successively increasing as the distance from the first opening increases.

9. The sampler according to claim 1 , wherein the bottom surface of the second portion of the distribution zone intersects the bottom surface of the analysis zone at an angle of 60°.

10. The sampler according to claim 1 , characterized in that a total length of the analysis zone and the ventilation zone is 30 mm.

Assignees

• Heraeus Electro Nite Int

Inventors

• Beyens Dries
• Verhoeven Jean-Paul

Classifications

• G01N1/20 Primary

  for flowing or falling materials ({G01N1/2035} G01N1/12, G01N1/14 take precedence) · CPC title

• G01N1/125 Primary

  adapted for sampling molten metals · CPC title

• G01N33/205

  in liquid state, e.g. molten metals · CPC title

• G01N21/25

  Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands · CPC title

• C21C2005/5288

  Measuring or sampling devices · CPC title