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US3621104A Expired / Lapsed US ⏱️ 0.0 years remaining

Sealing device for electrode holes in electric arc furnaces

Assignee: DMZ LENIN
•
Filing: 1970-09-17
•
Granted: 1971-11-16
•
Expires: 1990-09-17
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Abstract

Abstract Sealing device for electrode holes in electric arc furnaces; the device includes means creating a chamber around the electrode, and means for creating in the chamber a gas pressure exceeding the pressure in the furnace space. A diffuser is placed in the access duct of the chamber and a nozzle is located in the axis of the diffuser, this nozzle delivering gas under pressure which entrains additional quantities of gas. Preferably the gas is air. The chamber of the sealing device may have two or more access ducts, diffusers being placed in all access ducts, and a nozzle being located in the axis of each diffuser, each such nozzle delivering gas under pressure. The cross section of the diffuser may have a reduced height and an increased width, and may be shaped as an oval, an ellipse, a rectangle, or another similar geometrical figure; there may be two or more nozzles located in the diffuser, such nozzles delivering gas under pressure.

Inventors

  • 👤 Alexander Yordanov Valchev
  • 👤 Kyril Hristov Tashev

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 22:45
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/02; H05B7/12

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 103 words
A device for sealing the space between an electrode and a hole in a wall of an electric arc furnace, comprising means forming a chamber around the electrode, and means for creating in the chamber a gas pressure exceeding the gas pressure in the furnace space, said last-named means comprising an access duct including a diffuser connected to the chamber, a nozzle disposed at the entrance end of the access duct so that gas issuing under pressure from the nozzle entrains additional quantities of gas and impels them into the access duct, and a source of gas under pressure connected to the nozzle.
Claim 2
Independent Claim 103 words
A device for sealing the space between an electrode and a hole in a wall of an electric arc furnace, comprising means forming a chamber around the electrode, and means for creating in the chamber a gas pressure exceeding the gas pressure in the furnace space, said last-named means comprising an access duct including a diffuser connected to the chamber, a nozzle disposed at the entrance end of the access duct so that gas issuing under pressure from the nozzle entrains additional quantities of gas and impels them into the access duct, and a source of gas under pressure connected to the nozzle.
Claim 3
Dependent Claim 32 words
A sealing device according to claim 1, wherein the gas under pressure is air, and the air issuing from the nozzle entrains ambient air into the air stream entering the access duct.
Claim 4
Dependent Claim 45 words
A sealing device according to claim 1, wherein the means creating a chamber includes partition means which distributes air delivered by the access duct around the annular space between an electrode passing through the compartment and the radially inner edge of the compartment forming means.
Claim 5
Dependent Claim 46 words
A sealing device according to claim 1, wherein the chamber has a plurality of access ducts spaced substantially equally about the axis of the chamber, each access duct having a diffuser and a nozzle, and each nozzle being connected to a source of gas under pressure.
Claim 6
Dependent Claim 49 words
A sealing device according to claim 1, wherein the diffuser has a cross section with a height substantially less than its width, and comprising a plurality of nozzles disposed side by side at the entrance end of the access duct such as simultaneously to deliver jets of gas thereinto.

References Cited (Backward Citations)

US1129377A Cited
US3378619A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-11-15 1975-05-17 1975-11-16 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-11-15 1979-05-17 1979-11-16 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-11-15 1983-05-17 1983-11-16 $7700.00 Window Closed / Lapsed

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