Elemental analysis device

Patent metadata

Field	Value
Publication number	US-12228554-B2
Application number	US-202118000027-A
Country	US
Kind code	B2
Filing date	Sep 10, 2021
Priority date	Sep 14, 2020
Publication date	Feb 18, 2025
Grant date	Feb 18, 2025

Abstract

An elemental analysis device includes a first electrode and a second electrode between which a crucible MP containing a sample is nipped, and that heats the sample. The second electrode includes a second electrode main body that has a tip end having a substantially cylindrical shape, a second electrode tip, a cap that nips the second electrode tip between the cap and the second electrode main body such that a part of the second electrode tip is exposed to an outside, and a second screwing structure that includes a male thread and a female thread provided between the second electrode main body and the cap, and the second screwing structure further includes a purge groove that extends in a pitch direction and that is provided as a cutout provided to a part of crests of a thread of at least one of the male thread and the female thread.

First claim

The invention claimed is:

1. An elemental analysis device that includes a first electrode and a second electrode between which a crucible containing a sample is nipped, and that heats the sample by applying a current between the first electrode and the second electrode, wherein
the second electrode includes
a second electrode main body that has a tip end having a substantially cylindrical shape,
a second electrode tip that is provided on a tip end surface of the second electrode main body,
a cap that nips the second electrode tip between the cap and the second electrode main body in such a manner that a part of the second electrode tip is exposed to an outside, and
a second screwing structure that includes a male thread and a female thread provided between the second electrode main body and the cap, and

the second screwing structure further includes a purge groove that extends in a pitch direction and that is provided as a cutout provided to a part of crests of a thread of at least one of the male thread and the female thread,
a stepped portion is provided to a tip end side of the second electrode main body, and
an O ring is provided inside a ring-shaped groove formed by the stepped portion and a rim of the cap when the cap is screwed onto the second electrode main body.

2. The elemental analysis device according to claim 1 , wherein a recess into which a part of the second electrode tip is fitted is provided to the tip end surface of the second electrode main body.

3. The elemental analysis device according to claim 1 , wherein
a purge channel connecting an inside of the second screwing structure to an outside of the second electrode is provided, and
the purge groove makes up at least a part of the purge channel.

4. The elemental analysis device according to claim 1 , wherein
the cap includes
an exposure opening through which the second electrode tip is exposed to the outside,
a top surface including a pressing plate provided around the exposure opening and pressing the second electrode tip against the tip end surface of the second electrode main body when the cap is screwed onto the second electrode main body, and
a side surface having a substantially cylindrical shape and having an inner circumferential surface provided with the female thread.

5. The elemental analysis device according to claim 4 , wherein the cap further includes one or more vent holes provided on the top surface, on an outer side of the exposure opening.

6. The elemental analysis device according to claim 4 , wherein the cap further includes a gas discharge groove extending in the side surface, from an inner circumferential side to an outer circumferential side.

7. The elemental analysis device according to claim 1 , wherein the purge groove is provided to the female thread of the cap.

8. The elemental analysis device according to claim 1 , wherein the purge groove is provided to the male thread of the second electrode main body.

9. The elemental analysis device according to claim 8 , further comprising a ring-shaped recess provided near a base end of the male thread of the second electrode main body, wherein
the ring-shaped recess and the purge groove provided to the male thread communicate with each other.

10. The elemental analysis device according to claim 1 , wherein
the first electrode includes a housing recess in which the crucible is housed, and
the second electrode is movable between a first position at which the crucible is nipped between the second electrode and the first electrode inside the housing recess, and a second position at which the crucible is positioned outside the housing recess, the second position being separated from the first position by a predetermined distance.

11. The elemental analysis device according to claim 1 , wherein the crucible is placed on the second electrode.

12. An elemental analysis device that includes a first electrode and a second electrode between which a crucible containing a sample is nipped, and that heats the sample by applying a current between the first electrode and the second electrode, wherein
the second electrode includes
a second electrode main body that has a tip end having a substantially cylindrical shape,
a second electrode tip that is provided on a tip end surface of the second electrode main body,
a cap that nips the second electrode tip between the cap and the second electrode main body in such a manner that a part of the second electrode tip is exposed to an outside, and
a second screwing structure that includes a male thread and a female thread provided between the second electrode main body and the cap, and

the second screwing structure further includes a purge groove that extends in a pitch direction and that is provided as a cutout provided to a part of crests of a thread of at least one of the male thread and the female thread
wherein the cap includes
an exposure opening through which the second electrode tip is exposed to the outside,
a top surface including a pressing plate provided around the exposure opening and pressing the second electrode tip against the tip end surface of the second electrode main body when the cap is screwed onto the second electrode main body,
a side surface having a substantially cylindrical shape and having an inner circumferential surface provided with the female thread, and
one or more vent holes provided on the top surface, on an outer side of the exposure opening.

13. An elemental analysis device that includes a first electrode and a second electrode between which a crucible containing a sample is nipped, and that heats the sample by applying a current between the first electrode and the second electrode, wherein
the second electrode includes
a second electrode main body that has a tip end having a substantially cylindrical shape,
a second electrode tip that is provided on a tip end surface of the second electrode main body,
a cap that nips the second electrode tip between the cap and the second electrode main body in such a manner that a part of the second electrode tip is exposed to an outside, and
a second screwing structure that includes a male thread and a female thread provided between the second electrode main body and the cap, and

the second screwing structure further includes a purge groove that extends in a pitch direction and that is provided as a cutout provided to a part of crests of a thread of at least one of the male thread and the female thread
wherein the cap includes
an exposure opening through which the second electrode tip is exposed to the outside,
a top surface including a pressing plate provided around the exposure opening and pressing the second electrode tip against the tip end surface of the second electrode main body when the cap is screwed onto the second electrode main body,
a side surface having a substantially cylindrical shape and having an inner circumferential surface provided with the female thread, and
a gas discharge groove extending in the side surface, from an inner circumferential side to an outer circumferential side.

Assignees

• Horiba Ltd

Inventors

• Inoue Takahito
• Uchihara Hiroshi

Classifications

• G01N31/12 Primary

  using combustion (G01N25/20 takes precedence) · CPC title

• G01N31/005 Primary

  investigating the presence of an element by oxidation (G01N31/12 takes precedence) · CPC title