US1103425A - Automatic circulator for steam-boilers. - Google Patents

Description

A. MoNAB.

AUTOMATIG GIRGULATOR FOR STEAM BOILERS.

APPLICATION FILED JULY18,1913.

Patented July 14, 19%

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I A- MCNAB- AUTOMATIC GIRGULATOR FOR STEAM BQILERS.

APPLICATION FILED JULY 18, 1913- Patented July 14,1914.

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A. MoN AB.

AUTOMATIC 'GIRGULATOR FOB. STEAM BOILERS.

APPLICATION IILED JULY 18, 1913.

Patented July 14, 1914,

THE mamas versus w ITED WENT OFFICE.

ALEXANDER MQNAB, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE M NAB COMPANY, OF BRIDGEPORT, CONNECTICUT, A COREOR-ATION OF CONNECTICUT.

AUTOMATIC CIRCULATOR FOR STEAM-BOILERS.

Specification of Letters Patent.

Application filed July 18, 1913.

To all whom it may concern Be it known that I, ALEXANDER MCNAB, a citizen of Great Britain, residing in the city of Bridgeport, county of Fairfield, State of Connecticut, United States of America, have invented certain new and useful Improvements in Automatic Circulators for Steam- Boilers; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to certain new and useful improvements in automatic circulators for boilers and relates more particularly to what is generally known as. the Scotch type of boilers.

The primary object of the invention is to provide a circulator which may be adjusted so as to conform to various types of boilers possessin different characteristics in order that the how of water may be controlled in the most advantageous manner for the purpose of preventing priming.

Further the invention aims to provide a circulator which occupies minimum space, and one which is held in position relative to the boiler by simple attaching means, in. order to not only permit ease and rapidity of in sulation, but to also allow movement of the circ-ulator with relation to the boiler for the purpose of cleaning or inspection.

Further and other objects will later be set forth and will manifest themselves in course of the following description.

In the drawing: Figure l is a vertical longitudinal sectional view of aboiler equipped with the present invention; Fig. 2 is a fragmentary enlarged side elevation partly in section; Fig. 3 is a top plan view of Fig. 2; Fig. e is a section taken on the line 4:4 of Fig. 2; Fig. 5 is a detail perspective view of one of the sections of one of the side plates; and Fig. 6 is a detail perspective view of one of the deflector blades.

In proceeding in accordance with the present invention, two side plates are employed which extend longitudinally of the boiler, and which are generally designated 1, in the drawings, each side plate being formed of a plurality of sections 2. The

sections are provided with end flanges c which abut and are secured to each other by bolts 4:, for convenience in installation. One of the sections 2 adjacent the combustion chamber C is formed with a curved end plate 5 which latter extends at right angles to that section and engages the companion section 2 located opposite to the section which has said end plate5. Feet 6 are formed 011 the lower sides of each of the side plates 1 at the ends of the latter, and comformably engage the uppermost and preferably the outermost fire tubes T as more clearly illustrated in Fig. 4 of the drawings. Each of the side plates 1 has two, or optionally more, outwardly extending perforated horizontal lugs 7, which lugs engage with the nuts 8 of hook bolts 9. The threaded ends I of the hook bolts 9 are passed through the apertures of lugs 7 and the hooked ends thereof are engaged under the fire tubes T above mentioned, whereby it will be evident that upon proper rotation of the nuts 8 the side plates 1 will be moved downwardly and the hooked ends of the bolts 9 moved upwardly so as to firmly and rigidly secure the side plates to the aforementioned fire tubes T.

The side plates 1 are arranged in parallelism and are formed with apertures 10 in which latter the pivots 11 of the blades 12 project. The blades 12 bridge the spaces be tween the side plates 1 and have their lower ends formed with downturned edges 13. On the outer end of each of the pivots 11 at one of the ends of the blades, crank arms 14 are attached, which crank arms are connected by means of a horizontal rod 15. The rod 15 extends on the outer side of the adjacent side plate 1, and has one end thereof threaded to receive a'nut 16, said threaded end of the rod passing through the aperture of a boss 17 that is carried by one of the side plates 1. It will be evident that by manipulation of the nut 16, the rod 15 may be reciprocated in order to simultaneously vary the angular relationship of each of the blades 12 with respect to the tire tubes. It will also be I apparent from Fig. 2 of the drawings that the feet 6 sustain the lower sides of the side plates 1 above and in spaced relation to the adjacent portions of the fire tubes T, in orderto allow water to circulate through the space mentioned.

The. roof of the combustion chamber is preferably provided with a series of dogs vent any possible collapse thereof, ,thisex pedient being one that is well known and commonly used in boilers of this type.

forward deflection of the vertical column of waterC adjacent said rear wall, as will be I evident upon inspection of Fig. 1 of the drawings. It' should be understood however, that the 'deflector just described is not essential "or necessary to the invention, though it may be optionally utilized if de sired.

By reference to Fig. 1 of the drawings it will be observed that the blades are preferably arranged in the manner therein shown, that is to say the lower blades have their upper edges turned somewhat to the rear of the boiler, while the upper blades have their lower edges turned somewhat to the front of the boiler in order to better deflect the water. it will also be evident. that the blades in roximity to the combustion chamber are arranged in closer relation to each other than are the blades more remotely sit- 'uated with respect to'the combustion chamber.. It will further be observed that each rod 15 effects simultaneous adjustment of the series of blades.

The operation may be briefly summarized with the roof B of the fire chamber or fire box 13 it rapidly rises upwardly and impinges against the *lower set of blades of the circulator, and the latter, owing to their rearward inclination deflect the water against the front wall'C of the combustion chamber, whereupon the water rises with exceeding rapidity and impinges against the blades of theupper set of blades, and is deflected by :the latter toward the frontof the boiler, whereupon the water will descend and again contact with the roof B and pursue the course of travel above described ad infinitam. In Fig. 1 of the drawings it will be observed that the course of the water is therein depicted by straight arrows, while undulating arrows indicate 7 the path of travel'ofthe heat. It will be also apparent from the above, that any tendency of the water to foam upwardly, may be corrected by altering the degree of inclination of the blades to cause same to near horizontal disposition, as distinguished from vertical disposition, -thus decreasing the rapidity of rise of the water, by causing same to pursuefa more nearly horizontal path of travel. The present invention is of particular advantage for correcting priming tendencies, since, due to varying characteristics possessed by different boilers, some prime more than others, and by use of the presentinvention, the oh- 3 water, which will obviate any possibility of A stationary deflector 19 may be employed and secured by any approved means to the rear wall of the boiler so as to insure proper,

jectionin question can not only be remedied, but completly eliminated by adjusting the degree vof inclination of the blades, until the latter prescribe paths of travel for the foaming.

The water directly above the combustion chamber has no tendency to foam, due to the comparatively small heating surface that the combustion chamber roof provides, and in addition, the upper series of blades create'an extremely strong current which draws the water from above the combustion, chamber, by induction, toward the boiler front, and the combined currents, created as noted, in turn draw the vertical column of water (indicated C) toward the boiler front, effecting rapid circulation of the entire body of water, as depicted in Fig.1 of the drawings. As above stated the deflector 19 may be utilized to assist in forward travel of the vertical column of water, just referred to, though it may also be omitted, optionally either way.

A further material and decided advantage of the present invention is the ease and rapidity with which the circulator may be removed or installed, the removal being periodically necessitated in order to cleanse the boiler of deposits made bythe water, which 95 causes the formation of scale, and general corrosion. The removal of the circulator is accomplished by mere loosening of the nuts 8 to relax the grip of the feet and hooks of the hook bolts on the fire tubes, whereupon 100 the upper and lower blades, with the side plates and connected parts, may he slid as units to the front of the boiler, leaving the parts free of obstruction so as to be easily cleaned. j

The circulator blades 12 are located closer together as the wall 0' of the combustion chamber C is approached, for the reason that the heat is more intense adjacent this wall, andtherefore the upward current of the wa- 110 ter is proportionately accelerated, and requires deflection accordingly. The current of water toward the front of the boiler where the intensity of the heat becomes less and less, is so comparatively sluggish that 115 it is readily influenced by the rapidly mov- 3. In a boiler circulator, water deflecting 130 means, and means rigidly connected to the boiler tubes for movably supporting said deflecting means to permit adjustment of the latter.

4.. In a boiler circulator, a pair of spaced side plates, means to rigidly connect said plates to the boiler tubes, a series of blades extending transversely of the plates and connected at their ends to the latter, and means conneced to each of the plates for moving all of same in unison to vary the angular relationship between the plates and blades.

5. In a boiler circulator, water deflecting means arranged above and below the boiler tubes, and extending transversely of the tubes, and means to adjust said means to vary the angular relationship between same and the boiler tubes.

6. In a boiler circulator, side plates having feet which seat on the upper surfaces of the fire tubes, perforated lugs borne by the plates, hook bolts having the hooks thereof engaged with the lower surfaces of the fire tubes and having their threaded ends passed through the perforations of said lugs, nuts on the threaded ends of the bolts and engaged with the lugs, and pivoted water deflecting blades supported by said plates.

7 In a boiler circulator, a pivoted water deflector adjustable to vary the angular relationship between same and the fire tubes.

8. In a boiler circulator, a series of pivoted water deflectors, and means to move said deflectors in unison to thereby vary the angular relationship between same and the fire tubes.

9. In a boiler circulator, two series of spaced water deflectin blades arranged re spectively above and below the fire tubes, the blades adjacent the combustion chamber being located closer together than the remaining blades.

10. In a boiler circulator, two series of spaced water deflecting blades arranged respectively above and below the fire tubes, and means to enable adjustment of the blades of each series to vary the angular relationship which same bear to the fire tubes, the blades adjacent the combustion chamber being located closer together than the remaining blades.

11. In a boiler circulator, a pair of side plates alined with and formed at their bottom sides with means to seat on two of the fire tubes, means to removably clamp said seating means to the fire tubes, whereby when the clamping means is loosened the plates may be slid or moved lengthwise of the fire tubes, and a series of water deflecting blades secured at their ends to the plates and arranged in the space between said plates.

In testimony whereof I afiix my signature in presence of two witnesses.

ALEXANDER MGNAB.

Witnesses:

F. W. SMITH, Jr., M. T. LONGDEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner otlatents,

Washington, D. 0."

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