US1276002A - Boiler-pressure regulator. - Google Patents

Description

l. A. BACKLUND.

BOILER PRESSURE REGULATOR. APPLICATION FILED mu :4. I915.

1,276,002. PatentedAug.20, 191s.

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ISAACALFRED BACKLUND, OF CHICAGO, ILLINOIS, ASSIGNOR TO CARRICK ENGINEER- ING- CO., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

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Specification of Letters Patent. Patented Aug. 20, 1918.

Application filed May 24, 1915. Serial No. 29,987.

To all whom it may concern:

Be it known that I, IsAAo ALFRED BACK- LUND, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Boiler-Pressure Regulators, of which the following is a specification.

This invention relates to draft regulators for steam boilers and, more particularly, to

improvements in the apparatus illustrated in patent application Ser. No. 858,923, filed by me August 27, 1914.

The object of the invention is the provision of improved devices of this character for the better regulation of the steam pres,- sures Within boilers and especially those of relatively large sizes.

The invention is illustrated in the accompanying drawings, wherein Figure 1 is a view shown partly in front elevation and partly in vertical section of draft regulating apparatus applied to a steam boiler; and

ig. 2is a transverse vertical an enlarged scale of the controlling valve thereof.

Referring to said drawing, the numeral 1 designates a steam boiler having a smoke stack 3 which is provided with a damper, as indicated by broken lines 4. A water column 5, so called, is connected with the boiler above and below the water level, by pipes 6 and 7, respectively. 8 represents a tank which is connected by a pipe 9 with the upper end of said Water column and thence by the aforesaid pipe 6 with the steam space within the boiler.

The tank 8 is supplied with a liquid such as mercury or Water and, where the latter is used, it is most conveniently obtained from the water column 5 through a branch 9 of pipe 9. A shut off valve 10 is provided in the water supply pipe 9 and is thereby .closed after a predetermined amount of water is supplied to the tank and remains closed during the operating of the apparatus. 11 is a pet cock, provided for the tank to withdraw therefrom surplus water due to the condensation of steam which if not removed section to.

' same.

12 represents a pipe communicating with 1 the lower end ofsaid tank and is connected by a flexible tube 13 and a fitting 13 with a pipe 14 rigidly secured to a liquid receptacle 15. The pipe 14 has outlets 14 aflording communication With the interior of the receptacle.-

The pipe 14 is advantageously extended, as at 14 a distance above said receptacle and its upper end opens into the external atmosphere. Depending below the receptacle is a rod 16 which is vertically movable in guide 17. Said rod is provided with spaced apertures 16 which may be selectively used to accommodate pins, as 16 disposed above and below said guide to limit the vertical movements of the receptacle 15. Secured in adjusted position to pipe part 14 is a sleeve 18 provided with a stud 18 whereby it is pivotally connected to the arm of a lever whose other arm 19 carries a counter Weight 20 adapted to over balance and elevate the receptacle 15 when the liquid has drained therefrom.

The above described parts are substantially like those described in the aforesaid patent application, but in this instance the oiiice of the receptacle is to regulate upon occasion the action of a controlling valve for the admission of water into a hydraulic cylinder which is arranged to close the smoke pipe damper 4.

When the controlling valve is moved into position to allow the water to escape from the referred to cylinder, a weight connected with the damper becomes operative to open the same. More particularly, the above frame whose lower member 25 is slidable is mounted. 34 represents a Weight carried by the lever 32 and tends to hold the damper in open position.

35 is a pipe making connection between;

the cylinder 21 andthe casing 36 of a three- Way valve 37, which is preferably of the rotary type. Said casing, in addition to its opening 35 for the pipe 35, has two openings 38 and 39, whereof the former, 38, is

connected by pine elements 38 and 38 with a pipe 38 which, in turn, is connected with a water supply such as a city main. The

other opening, 39, is connected by pipe ele-' ment 39 with awaste pipe 39 which may lead to a sewer. r

The valve proper 37 has a cavity 37 therein which may be brought into positions to afford communication between the container pipe 35 and the opening for either the water supply or the waste pipes. The valve 37 is provided with a handle bar 37 which is connected by a rod 40 to the lever arm 19 supporting the receptacle 15 so that as the same descends or ascends the valve is influenced to respectively admit or allow the water to escape from the cylinder 21.-

11 is a valve for the pipe 9 and is employed when the apparatus is to be rendered temporarily idle as, for example, when supplying liquid to the tank 8. 42 is a valve for the pipe 38 and is used when the water supply is to be made inoperative.

43 indicates a vibratory arm for sustaining a portion ofthe weight of the chain 30 where the latter extends for a considerable distance. This arm and the lever 1919 may be supported by any suitable'means as for example by a column 44 including vari-' ous of the aforesaid pipe elements and se-* cured most conveniently to the tank 8.

The operation of the invention is as follows: The tank 8 is first supplied with liquid to a predetermined height under atmospheric pressure as would obtain when the valve 41 is closed. This valve is then opened admitting steam from the boiler into the tank where it acts to force the liquid up through pipes 12 and 13.

Should the boiler pressure exceed that for which the apparatus is adjusted the liquid will be elevated into the receptacle 15 and ultimately add sufficient weight thereto to overcome the weight 20 resulting in the lowering of the receptacle with a corresponding movement of the lever arm 19. When this occurs motion is imparted through the rod 40 to cause the valve 37 to be rotated from the position in which it is indicated in Fig. 1 to that in which it is shown in Fig. 2, whereupon the valve 37 is open withrespect to communication between the supply pipe 38 and the cylinder 21. The pressure of the water thus admitted to said cylinder effects the elevation of the plunger 23 together with the movable frame which is secured thereto. As the frame rises it acts through the medium of link 27 and lever 28-28 to exercise a pull through. the chain 30 to influence the arm 31 so as to effect a closing movement of the damper 4. As the damper closes the fire in the boiler furnace will. be more or less checked with a lessening in the generation of steam until the pressure thereof has been reduced below what is requisite to retain the liquid in receptacle 15. When this occurs the liquid returns'from said receptacle to tank'8 and the receptacle being thus relieved elevated by the power of weight 20.

The lever arm 19 swings upwardly wit the receptacle and acts through the rod 40 to restore the valve 37 into the position in which it is shown in Fig. 1, thereby opening communication between the cylinder 21 and the waste pipe 39 for the escape of Water from the cylinder. The water being thus withdrawn renders the plunger unsupported and it descends to relieve the chain 30 and .erly adjusted it operates without any attention by the fireman.

What I claim, is I p In apparatus of the class described, the combination with a steam boiler, a draftregulating device therefor, means tending to maintain the latter in inoperative position, and a hydraulic motor operatively connected with said device, of means influenced by an increase and decrease, respectively, of steam pressure within the boiler for rendering said motor operative and inoperative to actuate saiddraft-regulating device, said last-named means comprising a stationary liquid containing tank communicatively connected from its upper end with the steam space in said boiler, a vertically movable liquid receptacle having communicative connection w1th the lower end of the tank, adjustable means tending to yield ingly retain the receptacle in its uppermost position, a water supply pipe and a water waste pipe communicatively connected with,

said motor, a valve for controlling the flow of Water from and to the respective pipes in relation to said motor, and connections between said adjustable means and said valve whereby the latter is caused to be posi- "tively moved and proportionately to the movements of the receptacle due to the flow .of liquid into or from the same due to vari ations in steam pressures obtaining in said tank.

Signed at Chicago, 111., this 6th day of May, 1915.

ISAAC ALFRED BACKLUND. Witnesses:

. FRED S. FULTON,'

J. H. CROSBY.

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