US2056672A - Water-cooled housing for pyrometer devices - Google Patents

Description

Oct. 6, 1936. w. c. HOGG ET AL WATER-COOLED HOUSING FOR PYROMETER DEVICES Filed July 16, 1935 INVENTOR. M1. L/AM 6717066: 76 0/1446 CZAf/V'. BY .ZEMJ-EUM EOE ATTORNEYS Patented Oct. 6, 1936 WATER-COOLED nousmc FOR- rmomrmn DEVICES William 0. H088. Pittsburgh. and Thomas C. King, Munhall, Pa., and Lewis Rumford, 2d, Wilmington, Del., assignors to United States Steel Corporation, a corporation of New Jersey Application July 16, 1935, Serial No. 31.131

2Clalms. (01313-32) This invention relates to radiation pyrometer devices and more particularly to a cooling housing therefor. The radiation sensitive element of such pyrometer devices is particularly susceptible to and deleteriously aifected by heat radiation. Heretofore in the art it has been proposed to provide means including a. cooling housing whereby the radiation sensitive element is protected from deleterious heating. Such cooling housings as have heretofore been proposed however have been designed to maintain the entire pyrometer device at a fairly uniform temperature from one end to the other.

This is frequently undesirable where water cooling is used since the radiation sensitive element is operated at temperatures below which water vapor and hydrocarbon vapors condense. Under these conditions a liquid condensate deposits upon mirror, window, or lens surfaces within the element thereby making unreliable temperature readings.

In the normal use of such a pyrometerdevice, particularly in the measurlng'of furnace temperatures by the practice of the invention disclosed and claimed in copending application Serial No. 31,735, filed July 16, 1935 entitled Radiation pyrometer installation, by Lewis Rumford II,.one of the co-inventors of the present invention, the open end or nose of the pyrometer only is subjected to or exposed to excessive heating. By eliminating the excessive heating at this point air cooling of the remainder of the device is found to be efiective in holding the temperature of the radiation sensitive element within the desired range to prevent overheating and to prevent condensation of liquid upon the surfaces of the instrument.

One of the objects of the present invention is toprovide a. cooling housing for a radiation pyrometer device in which the open end of the device is preferentially cooled over the remainder. Another object is to provide means to protect the nose of the radiation pyrometer device from overheating and to prevent the condensation of water vapor and hydrocarbon vapors within the said device. Still another object of this invention is to provide an improved cooling housing for a radiation pyrometer device. Other objects and advantages will become apparent as the invention is more fully disclosed.

devised a cooling housing in which means are provided to water cool the open end of the pyrometer device and to air cool the remainder 5 thereoi'pand in combination therewith we have In accordance with the above objects we have provided a shutter element for closing the open end of the housing and pyrometer when desired to prevent the entrance into the housing of dirt and dust particles.

Before further disclosing the present invention reference should be made to the accompanying drawing wherein:-- a a Fig. 1 illustrates the usual relative positioning of a radiation pyrometer device with respect to a furnace in its commercial use;

Fig. 2 is a side elevation of the cooling housing of the present invention;

Fig. 3 is an open end view of the same; and

Fig. 4 is a longitudinal section along plane 4-4 of Fig. 3.

Referring to the drawing, as indicated in Fig. 1 the radiation pyrometer .l is positioned with its open end towards the furnace 2 and in axial alignment with the bore S-inthe furnace wall 4. Bore 3 as disclosed in the above identified copending application is angled vertically upward so that the radiant energy emitted from the inner surface 5 of the roof of furnace 2 may be measured by the pyrometer l. Furnace l as illustrated is a cross-sectional view of a typical open hearth furnace. Molten bath 6 on hearth I is heated by the heat energy of burning gases passing thereover from burner 8 disposed in one end. A second burner (not shown) is disposed in the opposite end of the furnace.

As may be readily seen from Fig. l the open end of the pyrometer device I only is subjected to excessive heating. The remainder of the device becomes heated mainly by conduction from this end. In accordance with the present invention cooling housing l0 (Figs. 2, 3 and 4) is provided with means to preferentially cool the open end of the pyrometer leaving the remainder of the housing to cool naturally in the open air. Thus the mirror concentrating radiation upon the radiation sensitive element ll (Fig. 4) of the pyrometer device I is protected from the condensation of water and hydrocarbon vapors thereon.

Referring to Figs. 2, 3 and 4,- the cooling housing of the present invention consists substantially of a tubular element I0 having an inside diameter approximating the outside diameter of the radiation pyrometer having at one end a chamber I2 provided with inlet and outlet openings or ports l3 and it respectively. The size and cooling capacity of chamber I2 may be varied widely without departing from the present invention depending in part upon the intensity of the heating effects to which the-open end I! of the pyrometer element may be subjected and upon the pressure 56 of water passing through chamber l2. The opposite end ii of the cooling housing l may be belied out substantially as indicated at IE to provide clearance for terminals l6 oi the said py- What we claim is:

1. In combination, a radiation pyrometer device including a tubular container having an open end and a closed end with a radiation sensitive rometer. element disposed adjacent the closed end, a tu- 5 In the ordinary use oi such a pyrometer in bular cooling housing enclosing said device inconnection with an open hearth furnace the open eluding means towater cool the open end of said end of the pyrometer is sighted through opening tubular container for a determined distance back 3 of the furnace, as indicated in Fig. 1. During towards the closed end but not the closed end operation of the furnace as soon as each heat is 7 thereof and a shutter element mounted upon said 10 tapped the refractory lining of thefurnace hearth "housing adapted to protect the open end of said 1 is relined with refractory materials which are I device and housing from the entrance of dirt and shoveled thereupon. The force of shoveling prodebris therein. pels particles of the refractory material through 2. In combination, a radiation sensitive device the opening 3 in the furnace back wall. The includinga tubular container having an open end 15 particles of refractory material fall into the open and a closed end and a radiation sensitive eleend of the pyrometer, clouding the mirror element disposed adjacent the closed end with means ment thereof and deleteriously aifects the reto concentrate a beam of radiation entering the sponsivity of the device. 7 open end upon the said element, and a cooling To eliminate this condition we provide shutter housing for said device, said housing being pro- 20 element H keyed adjacent its edge to one end of; vided with fluid cooling means to absorb heat rotatable shaft i8 mounted in bearings B9 on 7 radiation falling directly upon the open end of housing It]. Lever arm 201s provided on the said device and with means to permit air cooling opposite end of shaft 18 to rotate the shutter into or the closed end of said device and the said radifand out of end closing position on housing Ill. ation sensitive element and beam concentrating From the above description of the present inmeans enclosed thereby;

fvention it is apparent that many modifications V and adaptations may be made therein without WILLIAM .C. HOGG. departing essentially from the nature and scope THOMAS C. KING. thereof as may be included within the following I LEWIS RUMFORD II. 0

claims. I

CERTIFICATE OF CORBECTIO F.

October 6, 1936.

Patent N0. 056, 672. 1

WILLIAM 0. H066, ET AL.

It is hereby certified that the above numbered patent was erroneously issued to "United States Steel Corporation" as assignee of the entire interest in said invention, whereas said patent should have been issued to William C. Hogg, Thomas C. King, and Lewis Rumiord, II, said Rumford assignor to United States Steel Corporation, a corporation of New Jersey, as shown by the recorc' of assignments of this office. In the grant, line 2, and in the heading to the printed specification line 5, for "Lewis Rumford, 2d" read Lewis Rum- 'ford, II; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of" the case in the Patent Office;

Signed and sealed this 22nd day of December, A. D. 1936.

Henry Van Arsdale (Seal) Acting Commissioner of Patents.

CERTIFICATE OF CORRECTION.

Patent No. 2,056, 6'72. October 6, 1956.

WILLIAM 0. H066, ET AL.

It is hereby certified that the above numbered patent was erroneously issued to United States Steel Corporation" as assignee of the entire interest in said invention, whereas said patent should have been issued to William C. Hogg, Thomas C. King, and Lewis Rumford, II, said Rumford assignor to United States Steel Corporation, a corporation of New Jersey, as shown by the records of assignments of this office. In the grant, line 2, and in the heading to the printed specification, line 5, for "Lewis Rum-ford, 2d" read Lewis Rumford, II; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 22nd day of December, A. D. 1936.

Henry Van Arsdale (Seal) Acting Commissioner of Patents.

Images