US895239A - Automatic governing mechanism for constant fluid-pressure. - Google Patents

Description

.AUTOMATIC GOVERNIN PATENTBD AUG. 4, 1908. P. H. BROWN. Y n G MEG'HANISM POR CNSTANT FLUID PRESSURE.

APPLICATION FILED MAY 17, 1907.

f l l i i i,

'FRANcIs H.

BROWN, OFVPHILADELPHIA, PENNSYLVANIA, SSIGNOR T0 COMBSTION-A i ENGINEERING COMPANY, A CORPORATION` OF DELAWARE.

AUTOMATIC GOVERNING FOB. CONSTANT FLUID-PRESSU'*BS-Ei To all whom 'it may concern:

Be it known that I, FRANCIS H. BROWN, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Automatic Governin Mechanism for Constant F luid-Pressure, owhich the following is a specification.

In a co-pendin'g application, filed April 25, 1907, Serial No. 370,160, I have described and broadly claimed a noveland useful construction of a combustion and damper regulator which is adapted to be employed in connection With any d sired ype of furnace in order that the passage of the products of com# bustion from the furnace may be automatically controlled under-allconditions, so that the combustion of fuelithe furnace is properly regulated and the combustion is effected under substantially unifdrmconditions.

In my present invent 'nivhich may be used to advantage in conj ction With a construction such as is disclosed inthe above mentioned application, I haveilevised e. novel and useful 'construction of'controll` mechanism whereby the draft of the furnace is automatically controlled by novel mechan.

ism actuated by the variations in the steam pressure of the boiler.

To the above ends, my invention in its broad aspects comprises novel means controlled by fluid pressure for automatically actuating a governing mechanism.

It further consists of means such as a. blower driven at a constant speed for producing a constant pressure in a conduit, said conduit having al branch leading therefrom and communicating. with one or more furnaces below the grate, another conduit or by-pass being also provided which discharges into the atmosphere 'or leads to a desired point of utilization, each of said conduits branching from the main conduit being provided with a. damper, both of which are actuated by a motor, controlled by mechanism regulated by the variation in the steam pressure in the boiler.

It further consists of other novel features of construction, all as will be hereinafter fully set forth. A

For the purpose of illustrating my invention, I have shown inthe accom anying drawings, one form thereof since em; bodimen't willgive in ractice satisfactory and reliable results, alt ough it is to be un- Specification of Letters Patent.v Application med my 11. 1am. sexilu m."au,241.

resented Ang. 4., 1908.

vderstood that the instrumentalities of which my invention' consists can be variously arranged and organized andthat my invention is not limited to the precise arrangement and organization of these instrumentalities as herein set forth.

Figure 1 represents a side elevation, partly broken away, of a furnace having an automatic controlling mechanism embodying my invention connected therewith. -F ig. 2 represents a sectional view of another embodiment of a valve or damper whichA may be employedif desired. enlarged sale, s. portion of Fig. 1 showing the levers employed for actuating the valves or dempers.

Similar numerals of reference indicate corresponding parts in the gures.

Referring to the drewingsz-Since my .present invention may, if desired, be emsuch. as is disc osed in my above mentioned application, I have preferred show the same as being connected therewith.

Fig. 3 represents on an ployed in conunction with a construction 1 designates a furnace of 'any suitable or '80 conventional type, provided with a grate 2 end having a discharge pipe or outlet 3 leading from the combustion chamber 4. The

passage of the products of combustion from se the chamber 4 into the outlet 3 is controlled by means of a damper 5 pivoter] therein, to which is secured an arm 6 provided with a suitable counter-balance 7 and having 'a cord 8, one end of which is secured to the arm 6,

the other end thereof being secured to a suitable piston or other motor 9, as tviil be readily understood from my prior application to which I have hereinbefore referred.

' 10 desi'nates the valve mechanism which controls the passage of fluid to actuatethe moto'r 9, said valve mechanism 10 being o peratively connected with the -pivoted bla' e -11 mounted inthe boxelike casing 12 which is open at the to in order that said pivoted member 11 may e acted upon inv one direcplreric air, the opposite side of said member emg exposed to the pressure of the furnace gases which enter through the conduit 13 int-im the casing member 12. Y

14 designates the boiler having a conduit 15 lea therefrom and communicating With a casing 16 in which is mounted a diaphrm 17, to which latter is secured a stem 1s,

tion by a constant pressure such as atmose upper end of which extends through 11 i vleys 29 an the top of thecasing 16 and isoperatively connected with or e wages a lever 19, one end of which is pivote or ulcrumed at 20 to a suitable fined point. Y 21 designates a valve, the stem of whichv is connected to the lever 19 and is adapted to controlan inlet port 22 and an outlet port 23 of a valve casing which has a conduit 24 leading therefrom and opening into the piston leasing 25 in which is mounted a iston 26.V l 27 designates adjustable an "removable weights mounted on the stem of the piston 26. 28 designates a coi-d or cable secured to the stem of the iston 26 which passes over pul- 30 supported in any suitable manner, the end of said cable being secured to a .rod 31 upon which are adjustably secured weights 32. l l 33 designates ablower mechanism or equivalent device of any suitable or conventional type which, in the resent instance, comrises a fan mounten on a shaft 3,4v to which listter is secured a pulley 35, around which passes a driving belt 36, which latter also -asses around apullcy 37 mounted on a driv ing shaft 3S driven by an suitable means.

39 designates a conduit leadinnr from the 'Blowing mechanism 33, said conduit in the resent being divided into two ranches 40 and 41, the branch 40 communicating the interior' of the furnace below the grate 2, and the conduit 41 terinnat ing at any desired point.

'The conduit 41 may lead to any desired oint of utilization or may be Adischarged dgeely into the atmosphere as desired.

42 des'gnates a `damper pivotally mounted at 43 in the conduit 4 44 designates a link one end of which is iixed to the damoer42, `the other end thereof ha U pivoted thereto, one end of a link 45, the ot er end thereof being pivoted to one end of a lever 46 which is pivoted at 47 to any suitable hired oint.

48 designates a ink, one end of which isY pivoted to the end of the lever 46, the other end thereof seing pivoted at 49 to the rod or connection 31. l

5() designates'a damper pivoted at 51 in the conduit or byass 41.-

52 designates a r, one eiid'of which is fined to the damper 50, the other end thereof be ff pivot-ed io one end of the'lever 53, ohio is pirated at 54 to a suitable 'xe'd point, the other end-of said lever 53 being pivoted to one end of a link 55, the opposite end o f said iinn 55 being pivoted at249 to the connection 31.

ln the embodiment seen in Fig. 2, I have shown a modified and simpliied germ of conduit mechanism which comprises in the present instance a damper 56 ivoted to a rod 57 and adapted to control t e conduit 40, said rod 57 having also'pivoted thereto, a damper 58, it being of fcourseunh:595,239 i l derstood in practice,` and 58may h emade integral so e'sired.'

The dempers have secured thereto, an arm 59 to which theconnection or conduit 31 can be secured- The operationot my device will n ow be the dam ers 56 readily aplparentzAs the pressureof steam e in the bo p vision ofthe conduit 15 ,the diaphragm 17 in the casing 16 Will'be raised, thereb raising the lever arm 19 and causing the va ve 21 t0 close the inlet`22,rthusperniitting the motive fluid Within the casing 25 to pass therefrom l through the outlet 23. This will permit the iston` 26 to descend, therebyraising the links 48 and 55 and owing tothe manner in which these links are operatively connected Withthe dempers 42 and 50, respectively, the damper 42 will be partially or Wholy closed and the damper 50 Will-be artially or of variation in the steam pressure.

r 14 inc`rease's,.oving to the prom Since the blowing mechanism 33A Aisalvv'ays" l driven at a constant speed, a' constant pressure of air is reduced, and since the dam er 42 has now een partially closed instea of the normal proportion of air passin through the conduit 40 to the furnace, a sma ler quantity will pass thereto, the excess of air assing through the conduit 41` which lea s to any desired point.'

It is apparent that the discha er'of the 1 products of combustion from the urnace is regulated by the pressure of the furnace gases, since the damper 5-Wi1l be opened or, closed ovriiigto the manner in which the motor 9 is controlled by the valve mechanism' 10, which latter is actuated by the swinging member v11 acted upon in one direction by constant ressure and in the o posits direction by t e pressure of the umace gases. which pam thereto through the .conduit 13:

It 'will also be a parent to those skilled ln/ this art that the d) ternately opened and closed. depending u'pon the pressure of steam in the boiler 14, since when the cord or cable 31 is drawn upward, the damper 56 will close the conduit 40, and the damper 58 will erniit the excess of premura to pass throng the branch or conduit 41, 'which may discharge at any deanipers-'and 58 will be.' A :5

ico

sired point of utilization Yor to the atmosphere.

ln the devices heretofore employed in controlling the draft of the furnace, 1t' has been deems mechanism for controlling t mism and so far as' I am aware I am the I. rst in theart to employ a mechanism m Wholly opened depending upon t e amount' y necessary to em loy complicated gie blowing mechautomatically controlled by suitable valve or other mechanism and my claims tothese. g features are to be'inteipreted with corre-5 spondiiig scope.

In my present inventionfl have shown my g novel construction of regulating mechanism as adapted to automatically control the passage of air through a plurality of conduits, but it will be apparent that it may be emi ployed to control the pass-sage of any desired lluid such as water, oil or gas and furthermore that it is controlled by variations of i )ressurc of any desired lluid and is not liml ited to use in conjunction with a. steam boiler.

The ,device may also he employed to eon trol the speed of an engine for driving a blower or other mechanism, or for maintaining a constant water level in the boiler.

lt will be further apparent that w'iiile I have preferred in the present ease to show a damper as employed in a conduit, any desired or conventional type of valve may be employed.

lt will now be apparent from the foregoing that I have devised a novel and useful construction of an automatic regulating niech anism which embodies the features of advantage enumerated as desirable in the statement o f invention and the above description and while. I have, in the present instance, shown and described one embodiment thereof which will give in practice satisfactory and reliable results, it is to be understood that it l is susceptible of modification in various parg tieulars without departing from the spirit and scope of the invention or sacrificing any of its advantages.

llaving t-lius described my invention, what l elaini as ncwand desire to secure by Letters 1iatent, is:-

l. ln a regulatingmechanism, the combination with a. boiler, of means for producing a constant draft, and devices regulated by Q the variation in steam pressure for automatl ieally causing a desired quantity of air to A pass to the furnace and the excess to a, de sired point of utilization..

2. In a regulating mechanism, the combi nation with a boiler, of means for producing a draft of constant pressurt, a conduit lead- '50 ing therefrom to the furnace, a branch from said conduit, dampcrs in said conduit and 5 branch, and means controlled by the variation of steam pressure in said boiler for s im'ultaneously opening one -and closing the 55 other of said dampers.

i e In a regulating mechanism, the combination with a boiler, of means for producing a draft of constant pressure, a conduit leading therefrom to the furnace, abrancli from 60 said conduit, valves for controlling said'conduit and branch, and means controlled by the variation of steam pressure in said boiler for simultaneously opennig one and closing the other of said valves. 65

4. In a draft regulator, the. combination with a furnace and its boiler, of a draft producing device, 'means for actuating` said de. vice at a constant speed, a conduit having at plurality of branches leading from said de- 70 vice, one of said branches communicating with the furnace beneath its grate, dampexs operatively connected with .each other and eontrolhiigsaid branches, a motor controlling l said danipers and valve mechanism control- 'I5 ling said motor and means actuated bythe variations in steam pressure for automatically controlling said valve mechanism.

5. ln a furnace, the combination with its boiler, of -draft producing mechanism, driv- 80 ing means for actuating the latter at a con stant speed, a conduitl from said niechanisn'i communicating with the furnace beneath its` j grate, a branch from said conduit, a motor controlled by variations in s'teani pressure in S5 said boiler, and valves in said conduit and branch controlled by said motor, one. of said valves being adapted to simultaneously open as the other of said valves closes.

FRANCIS lLBlJtOW. lVitnesses: l A

lliniinsirr S. Faniasits, C. l). MCVAY.

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