GB688998A - Improvements in electric furnaces for the heat treatment of metal articles - Google Patents
Improvements in electric furnaces for the heat treatment of metal articlesInfo
- Publication number
- GB688998A GB688998A GB20551A GB20551A GB688998A GB 688998 A GB688998 A GB 688998A GB 20551 A GB20551 A GB 20551A GB 20551 A GB20551 A GB 20551A GB 688998 A GB688998 A GB 688998A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- tubes
- metal
- outer tube
- supported
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/22—Rotary drums; Supports therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
- F27D11/02—Ohmic resistance heating
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/62—Heating elements specially adapted for furnaces
- H05B3/64—Heating elements specially adapted for furnaces using ribbon, rod, or wire heater
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Details (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
688,998. Tubular electric furnaces. NEEDLE INDUSTRIES, Ltd. Dec. 20, 1951 [Jan. 3, 1951], No. 205/51. Class 39(iii) [Also in Group II] Metal articles, e.g. needles to be heattreated are fed into the upper end of an inclined tube 10 which is vibrated and heated by passage of current therethrough, and the articles heated by passage through the tube fall at its lower end through a tubular shield 31 into quenching liquid. The tube 10 is free from bends and internal projections and is electrically connected at its lower end to a larger metal tube 11 around the tube 10 so as to leave an annular space between the tubes, to which current is supplied by connections 26 at their upper ends so that current passes through the tubes. The inner tube 10 is of nickel chrome alloy and is supported by spaced insulators 19 from the outer tube so as to be free to expand longitudinally relatively to the outer tube 11. The inner tube 10 may taper towards the delivery end, where it is connected to the outer tube 11, which is tapered at its lower end 13. The lower parts of both tubes are cut away at their lower ends to form a delivery opening 15, the edges of the metal tubes being electrically connected at the delivery lip 16 so formed, which thus receives more heat. The ends of the tubes 10, 11 are preferably connected around their entire peripheries at the lower end. Powdered insulation 20, 25 is placed in the annular space between the tubes 10, 11 and in the space between the outer tube 11 and an outermost cylindrical shroud 24 supported on the tube 11 at one end by a circular plate 14 and at the other end by a flexible metal diaphragm 21 welded to the tube 11 at 22. The shroud 24 is insulated from the tubes by insulating rings 23. The furnace is supported from below upon vertical leaf springs, one of which carries an armature and is vibrated by a solenoid vibrator. The outer tube 11 may be of the same metal and resistance as the inner tube 10, or may be of metal of lower resistance or one having a low coefficient of expansion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB20551A GB688998A (en) | 1951-01-03 | 1951-01-03 | Improvements in electric furnaces for the heat treatment of metal articles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB20551A GB688998A (en) | 1951-01-03 | 1951-01-03 | Improvements in electric furnaces for the heat treatment of metal articles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB688998A true GB688998A (en) | 1953-03-18 |
Family
ID=9700259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB20551A Expired GB688998A (en) | 1951-01-03 | 1951-01-03 | Improvements in electric furnaces for the heat treatment of metal articles |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB688998A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1022715B (en) * | 1956-08-07 | 1958-01-16 | Heraeus Gmbh W C | Heating conductor for low voltage ovens |
| DE1088778B (en) * | 1956-08-07 | 1960-09-08 | Heraeus Gmbh W C | Device for vacuum evaporation |
| DE1232180B (en) * | 1960-12-17 | 1967-01-12 | Skf Svenska Kullagerfab Ab | Tube furnace |
| US3422205A (en) * | 1966-09-29 | 1969-01-14 | Carborundum Co | Electric furnace having replaceable liner tube sections |
-
1951
- 1951-01-03 GB GB20551A patent/GB688998A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1022715B (en) * | 1956-08-07 | 1958-01-16 | Heraeus Gmbh W C | Heating conductor for low voltage ovens |
| DE1088778B (en) * | 1956-08-07 | 1960-09-08 | Heraeus Gmbh W C | Device for vacuum evaporation |
| DE1232180B (en) * | 1960-12-17 | 1967-01-12 | Skf Svenska Kullagerfab Ab | Tube furnace |
| US3422205A (en) * | 1966-09-29 | 1969-01-14 | Carborundum Co | Electric furnace having replaceable liner tube sections |
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