US742128A - Automatic forced-draft regulator. - Google Patents

Description

fNo. 742,123. PATENTED 00T. 20,. 1901's.

. n.5. PARSON.

AUTOMATIC FORCED DRAET'REGULATOR.

APPLIOATION FILED MAYS; 1902. l N0 MODEL. 2 SHEETS-SHEET l.

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No. 742,128. PATENTED OCT. 20, 1903'.y

' H. EL PARSONlv AUTOMATIC 'FORCED DRAFTRBGULATQB;

` APPLICATION FlED MAY 3, 1902.

N0 MODEL.

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Patented October 20, 1.903.

PATENT OFFICE.

yneNRY E. PARSON, or BROOKLYN, NEW'YORK, AssIeNoR, BY MEsNE As\ sIGNMENTs, To PARsoN MANUFACTURING COMPANY or NEW YORK, A

CORPORATION or NEW YORK.

AUTOMATIC FORCED-DRAFT REGULATOR.

SPECIFICATION forming part of Letters Patent No. 742,198, dated October 20, 1903.

Appleman inea May 3,1902. stanno. 105,810. cromati.)

To @ZZ whom t may concern.:

Be it` known that I, HENRY E. PARsoN, a citizen of the United States of America, and a resident of Brooklyn, county of Kings,State of New York, have invented certain new and useful Improvements in Automatic Forced- Dratt Regulators, of which the following is a specification.

My invention relates to an automatic dero vice for regulating the intensity of the re used for heating water in a steam-boiler. It is an improvement upon the devices which are the subject-matter of Letters Patent of the United States Nos. 681,456 and 681,457, which have been issued to me heretofore on the 27th day of August, 1901.

The purpose of the present apparatus is to simplify the devices employed in the patents referred to and to increase the positiveness zo of their operations. Y,

In this structure I have dispensed entirely with the rope or Wire connections and coun.- terbalancing-Weights and perform all the necessary operations by positive steam or Water pressure through the medium of properly-constructed valves.

In the drawings the same numbers represent the same parts in all figures. Y

Figure 1 is a part section and part verticalv 3o elevation of my improvedtire and boiler pressure regulator. Fig. 2 is a detail of the two- Way-valve-regulating levers. Fig..3 is aview illustrating the valves in the position assumed when the steam has reached the desired pres- 5 sure.

Referring to the drawings, Fig. 1 is the combustion-chamber,in which there is mounted a boiler 2. 3 is a bridge-walI, and 4 a banking-platform' constructed in connection with 4o the bridge-wall. 5 is a grate-platform constructed in the usual way in whichI construct mygrate-platforms. Thegrateisconstructed of sections ot cast-iron plates provided with conical holes larger on the lower side and smaller on the upper side of the grate. 6 is a forced-draft tube. 7 is aforced-draft blower. 8is the steam-pipe bywhich the blower is supplied With steam. It passes through the Wall of the {ire-chamber and is connected through the valve 9 with the main steam-pipe 10. The ash- 5o pit 11 is closed and no air isadmit'ted to it except through the forced draft pipe 6. The space above the grate 5 is a combustion-cham- .ber, where the gases produced from the ',re

meet' a suitable supply of air coming from the bridge-Wall and are burned. 12 12 are channels in the bridge-wall, through which a part of the air entering through the forced-draft pipe 6 is permitted to pass, is heated, and is then admitted into the combustion-chamber in the presence of the gases ot' combustion from the ire. Thus the iire is regulated both as to the amount of air-supply below the grate and the amount of air-supply above the grate. 13 isa valve-stem, and 14 a valve by which the amount of air to be admitted to the channels'12 may be regulated. The main steamsupply pipe 10, connected with the dome of the `boiler by means of the steam-pipe 15, has branches from its top and lower sides. The top branch 16 is connected to one side of the valve 9, While the steam-pipe 8, which supplies steam to the blower, is connected to the opposite side of the valve 9. To the top of the valve 9 is .connected a steam-pipe 17, which extends from the valve 9 down to a valve 18. This valve consists of a valve proper, 18a, rotatably mounted in the casing 18, and is provided with a groove 18", designed to register with the port 17'a and the exhaust-y 8c port 40 to relieve the pressure at the top of the piston of valve 25 when the pressure of steam is lowered. The valve 18a tits the casing 18 loosely at the top to form communication between'port 39a andV the port 17` when 35 the steam reaches the predetermined pressure. The valve 9 is shown in vertical section in Fig. 3. 19 is the valve-casing, havingtwo main openings 20 and 21 on opposite sides, 20 connected to the steam-pipe 16, 21 connected tothe steam-pipe 8. Atthe top of the valve-casing there is an opening 22, to which is connected the steam-pipe 17. On the side of the casing. there is an opening 22a, vwhich is connected to exhaust and which exhausts Vthe space between the two pistons in the cylseparates the inlet 2O from the outlet 21. In the center of the partition 23 there is a valveseat 24, upon which is seated a valve 25, by which the communication between the inlet and the outlet 2l is controlled. On the stem 26 of the valve 25 there are two pistons 27 and 28. The upper portion of the valvecasing 19 is cylindrical and is formed in two diameters, one larger than the other. The lower one forms a cylinder for the piston 27. The upper one forms a cylinder for the piston 28. The pistons 27 and 28 are rigidlysecured upon the stern 26 and move together. It will be noticed that the area of the piston 27 is greater than the area of the valve 25, and consequently when boiler-pressure is admitted at inlet 2O and relieved from the cylinder above the pistou 28 the piston 27 will be forced up by the steam and the valve will be opened. If, on the contrary, the same boilerpressure which is admitted by inlet 2O is also admitted by inlet 22 it will ll the cylinder in which moves the piston 28, and because ofL the greater area of the piston 28 will force that piston down and with it the piston 27 and the valve 25 and maintain the valve 25 upon its seat. Pressure is applied to the top of the larger piston 28 by means of the steamboiler pressure admitted to the condenser 30 and the train of pipes connecting it to the top of the casing by the inlet 22; but this train of connection after passing the condenser is filled with water formed by condensed steam. If the piston 28 should leak and the space between the pistons become filled with Water and there is no exhaust for the water, the motion of the largerpiston would be blocked and itwould be impossible to close the valve 25. Therefore it is thatthe exhaust 22n is provided, so as to carry off any leakage that may escape into the interspace between the pistons 27 and 28.

Referring to Fig. l, it will be seen that connected to the bottom of the main steam-pipe 10 there is a pipe 29, which connects with the condenser 30, which is in its turn connected by a pipe 31 with acylinder32, in which there moves a piston (not shown in the drawings) which will be raised or lowered as steam-pressure is admitted to or cut off from the cylinder 32. The piston-rod connected to the piston within the cylinder 32 rises through the center of the head of the cylinder. 33 is a lever pivoted at 34 on the head of the cylinder 32 and extending to the left beyond a stand 35, on which the cylinder 32 is mounted, and resting on the upper end of the piston-rod. On the end of the lever is suspended a weight 3G. The lever 33 is slotted at 37, the slot being quite wide. The valve heretofore referred to is mounted on the end of the stand 35 and consists of a rotating two-way valve, moved by the stem, which protrudes axially through the valve-chest and has upon its end a lever 38, which is connected by means of 'a turn-nut in the slot 37 with the lever 33 and is moved by the lever as it rises and falls.

By reference to Fig. 4 it will be seen that the bolt in the end of the lever 38, which passes through the slot 37 in the lever 33, is of much less diameter than the slot 37. Hence the lever 33 will be permitted to move a distance equal to this difference ofdiameter before moving the lever 38 or the valve 18. The lost motion thus provided for plays an important part in the regulation of the boiler-pressure. If the engine is working hard and drawing heavily on the boiler, the boiler-pressure will be peroeptibly lessened. With each stroke of the engine there will be a corresponding change in the conditions affecting the automatic valve, and the drop of boiler-pressure, if low enough, will actuate the main valve and start the blower. It may be, however, that the rate at which steam is being generated by the existing fire is suticient to supply the demands of the engine in a few seconds and that there is no necessity for starting the blower. If this be the case, the lever 33 will vibrate under the influence of fiuctuation of steam-pressure without moving the valve-lever 38 or affecting the Valve, due to the lost motion in the slot 37. If the drain upon the boiler is faster than the generation of steam, the vibration of the lever 33 will take place through the same are; but the arc will gradually move down and the lever 33 will hammer with each vibration upon the bolt in the end of the lever 38 until it has moved it far enough to close the valve 18 to steam and open it to exhaust. Then as the steam-pressure rises the lever 33 will still vibrate under the engines drain upon the boiler and will first vibrate withouttouching the bolt of lever 38 and will then hammer upon it until the valve 18 is again opened and the forced draftstopped. This operation of hammering the lever 38 little by little as the lever vibrates until the valve 18 is either opened or closed produces most satisfactory regulation-much more satisfactory than-the toosudden opening orclosingof the main valve, and consequent starting or stopping of the blower.

The steam-pipe 17, which is connected with the top of the main valve 9, enters the side of the valve-chest 18. Into the top of the same valve-chest enters a branch pipe 3E) from the steam-pipe 31.

40 is a drain-pipe.

The two-way valve 18 is so constructed that in one position of the lever 38 a communication will be established between the steampipe 31 and the steam-pipe 17, and in the other position of the lever 38 that communication will be cut off and a communication established between the steam-pipe 17 and the drain-pipe 40. When the steam-pressure in the boiler rises to a point high enough to cause the piston of the cylinder 32 to force its pistou-rod upward beneath the lever 33 and raise that lever sufficiently to release the arm 38 and the valve 18 and open communication between the steam -pipe 31 and the IOO ^ ing the valve 25 down upon its seat.

steam-pipe 17, then steam or water will be admitted to the top of the valve 9 into the cylinder in which moves the piston `28 and the piston 28 and valve 25 will be moved downward until the valve meets its seat 24 and closes the communication'between the steam -inlet 20 and the steam -pipe 8, the blower of the lforced-draft device will be stopped, and the intensity of the fire checked. With the checking of the intensity of the fire the amount of steam generated will be lowered and the boiler pressure will consequently be lowered, both by reduction of temperature and-work cast upon the boiler. As soon as the boiler-pressure drops sufficiently to allow the weight 36 to draw the lever 33 downward and turn the arm 38 and the valve 18 to a position where it will cut off steampressure from the steam-pipe 17 and the top of the valve 9 it will at the same time open communication between the steam-.pipe 17 and the drain-pipe 40, which will at once drain the steam-pipe 17 of whatever steam or water may be in it and relieve the pressure from the top of the piston 28, which is hold- Immediately the steam-pressure of the boiler, which is constantly below the piston 2 7, will force that piston up and raise the valve and-again admit steam to the steam-pipe 8 and start the forced-draft blower. It will thus be seen that when the pressure in the boiler reaches the desired degree the forced-draft apparatus will be stopped automatically, and when it falls below that degree the forced draft will again be started and the tire will be maintained at such a degree of intensity as to constantly keep the boiler-pressure up to a desired level. A

In addition to the regulation of the forceddraft blower it is desirable to regulate the tire to some extent by means of a damper in the chimney.

Referring again to Fig. 1, 4l is the damper, suitably mounted in the chimney upon a shaft 42, which protrudes vthrough the wall of the chimney andhas upon its end a crank 43, to which is connected a rod 44, secured to the end of a lever 45. The lever 45 is pivoted at 46 upon the top of the boiler and upon theside of a cylinder in which therel is a piston. (Not shown in this drawing.) 47 is the piston-rod, protruding through the head of the cylinder and connected tothe le- Ver 45. 48 is a weight -upon the end of the lever 45. The tendency of the weight 48 is to draw the lever 45 downward and close the damper 41 in the chimney. 'The eiiect of the piston-rod 47 and its piston is to hold the lever 45 up under boiler-pressure and prevent the closing of the damper 41. 49 is a steam-pipe connected to the steam-pipe 8 beyond the valve 9 and at its other end to the cylinder 50, in which reciprocates the piston and piston-rod 47. It will be seen that when the steam is admitted to the steam-pipe 8 it will also enter the steam-pipe 49, raise thel will draw the lever 45 down and turn the damper 4l, so as to partially close the chimney-aperture, thus reducing the draft and the fire. This automatic damper-regulator can be used with or without the forced-draft apparatus.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In an automatieforced-draft apparatus, the combination of a boiler, a combustionchamber, a grate, a blower, a steampipe supplying steam to the blower, a valve in the steam-pipe, said valve consisting of a valve and valve-seat, two cylinders, each of different size, and each containing a piston, both pistons connected to and movable with the valve, one piston operating to open, and the other piston operating to close the valve, and automatic means for admitting and cutting off steam from the larger cylinder, the smaller cylinder being in open communication with the steam-pipe leading from the boiler, substantially as described..

2. In an automatic forced-draft apparatus, the combination of a boiler, a combustionchamber, a grate, a blower, a steam-pipe supplying steam to the blower, and connected to the boiler, a valve in the steam-pipe, said valve consisting of a valve and seat, and two pistons mounted on the valve-stem, one piston being larger than the other, and both reciprocating with the valve, a cylinder for each piston in which it is fitted, and automatic mechanism controlled by boiler-pressure and operating to control the movement of said valve, substantially as described.

3. In an automatic forced-draft apparatus, the combination of a boiler, afuel-chamber, a grate, a blower, a steam-pipe supplying steam IOO log

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to operate the blower, and connected to the boiler, a valve in the steam-pipe, consisting of a valve and a valve-seat, and two pistons mounted on the valve-stem, one of the pis- `tons-being larger than the other, two cylinders in which the pistons fit and reciprocate, each of which is supplied with boiler-pressure, a branch from the main steam-pipe, a cylinder, piston and lever operating atwoway valve, the cylinder being supplied with steam by the branch from the main steampipe, a two way valve also supplied with steam by the branch from the main steampipe,a branch connected to the .two-way valve, and to the larger of the cylinders of the Valve, and connections from the .two-way valve to exhaust.

4. In an automatic forced-draftapparatus the combination of a boilelya fuel-chamber, a grate, a blower, a steam-pipe for operating the blower, a Valve in said steam-pipe, said valve consisting of a valve and valve-seat, and two ICO pistons mounted on the Valve-stem, one larger than the other, and each reciprocating in the cylinder in which it fits, each cylinder having a connection to boiler-pressure, a branch from the main steam-pipe between the valve and the boiler, which is connected to the larger one of the cylinders of the valve, a two-way valvc located in this branch pipe, and means for opening and closing said valve as the boiler-pressure rises or falls above or below a desired degree.

5. In an automatic forced-draft apparatus, the combination with a boiler and a blower for the fuel-chamber, of a pipe connecting the boiler and blower, a valve in said pipe normally opened by boiler-pressure below a predetermined point, to supply the blower, and means to admit boiler-pressure to the valve to close it when said boiler-pressure exceeds said predetermined point.

6. In an automatic forced-draft apparatus the combination of a boiler, a fuel-chamber, a blower,.a pipe supplying steam to the blower, a valve in the pipe, two cylinders of different sizes, each containing a piston, both pistons connected to the valve, one operating to open, and the other to close it, pipe connections from each cylinder to the boiler, and a valve located in the supply-pipe in the larger of the cylinders, with means for opening or closing said valve operating by boiler-pressure, said means constructed with a calculated amount of lost motion,whereby it is permitted to move or vibrate through a certain amplitude before aifecting the valve,substantially as described.

7. In an automatic forceddraft apparatus, the combination with a boiler and a blower for the fuel-chamber, of a pipe connecting the boiler and blower, a valve in said pipe normally opened by boiler-pressure below a predetermined point to supply the blower, means to admit boiler-pressure' to the valve to close it when said boiler-pressure exceeds such predetermined point, and means for automatically controlling said latter means.

8. In an automatic forced-draft apparatus, the combination with a boiler and a blower for the fuel-chamber, of a pipe connecting the boiler and blower, a valve in said pipe normally opened by boiler-pressure below a predetermined point to supply the blower, means to admit boiler-pressure to the valve to close it when said boiler-pressure exceeds such predetermined point, and means to shunt the valve-closing pressure from the valve when the boiler-pressure falls below the predetermined point.

9. In a device for automatically controlling steam-pressure, a boiler, a ire-boX, a steam-pressure pipe, a valve in said pipe arranged to be constantly iiuttered under the iniiuence of the boiler-pressure between certain predetermined pressure-points and allowed to close or be forced open as the boilerpressure exceeds or falls below such predetermined points.

10. In a device for automatically controlling steam-pressure, a boiler, a Iire-box, a steam-pressure pipe, a valve in said pipe, means to close said valve, and means to open the valve, the variations between predetermined points of boiler-pressure constantly af fecting the operation of each of said means and fluttering the valve, an increase or decrease of such predetermined boiler-presen re positively opening or permitting the closing of the valve.

ll. In an automatic steam-pressure controller, the combination with a boiler, and a tire-box, of a steam-pressure pipe, a valve therein, a lever arranged to constantly flutter under impulses of the steam-pressure between predetermined points, and connections between the valve and lever, to permit a movement of the lever to open or close the valve as the boiler-pressure exceeds or falls below such predetermined points.

l2. In an automatic steam-pressure controller, the combination with a boiler and a lire-box, of a steam-pressure pipe, a valve therein, a lever formed with a slot, said lever being constantly luttered by impulses of the steam-pressure between predetermined points, a valve-arm for moving the valve, and a pin projecting from the arm and loosely seated in the slot in the lever, whereby the fluttering lever may constantly move the valve, the effective movement being in one or two directions according as the pressure exceeds or falls below such predetermined points.

13. In an automatic forced-draft apparatus, the combination with a boiler and a blower for the fuel-chamber, of a pipe connecting the boiler and blower, a valve therein admitting power to the blower and opened by a predetermined boiler-pressure, means for admitting boiler-pressure to the valve to close it when said pressure exceeds such predetermined point, and means automatically controlled by boiler-pressure for shunting the valve-closing pressure when the boiler-pressure has fallen below such predetermined point.

- la. In an automatic forced-draftapparatus, the combination with a boiler and a blower for the fuel-chamber, of a pipe connecting the boiler and blower, a valve therein admitting power to the blower and opened by a predetermined boiler-pressure, means to admit the boiler-pressure to close the valve when the boiler-pressure exceeds the predetermined point, and means automatically controlled by definite points of boiler-pressure for regulating the valve-closing pressure.

l5. In an automatic forced-draft apparatus, the combination with a boiler' and a blower for the fuel-chamber, of a pipe connecting the boiler and blower, a valve therein admitting power to the blower and opened by a prede termined boiler-pressure, a regulator for admitting the boiler-pressure when above the predetermined point to close the valve, and means for controlling said regulator.

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16. In an automatic forced-draft apparatus, the combination with a boiler and a blower for the fuel-chamber, of a pipe connecting the boiler and blower, a valve therein admitting power to the blower and opened by a predetermined boiler-pressure, a regulator for admitting boiler-pressure to the valve to close it when the pressure exceeds such predetermined point, and means controlled by predel termined points of boiler-pressure for governing the regulator.

17. In an automatic forced-draft apparatus, the combination with a boiler and a blower for the fuel-chamber, of a pipe connecting the boiler and blower, a valve therein admitting power to the blower and opened by a predetermined boiler-pressure, a regulator for admitting boiler-pressure to the valve to close it when the pressure exceeds such predetermined point, said regulatorl comprising a valve constantly uttered between predetermined pressure-points and `fully opened or closed at pressure-points above or below such predetermined pressure-points only.

18. In an automatic forced-draft apparatus, the combination with a boiler and a blower for the fuel-chamber` of a pipe connecting the boiler and blower, a valve therein admitting power to the blower and opened by a prede- Itermined boiler-pressure, a regulator for admitting boiler-pressure to the valve to close it when the pressure exceeds such. predeter-` mined point, said regulator comprising'a valve, a lever constantly iluttered betweeny valve, a slotted lever constantly nttered between predetermined points of boiler-pressure, a valve-arm for moving the valve, and a pin projecting from the arm and loosely enteringthe slot in the lever, said lever being moved to operate the valve when the pressure exceeds or falls below suchpredetermined points.

Signed by me at New York, N. Y., this 5th day of March, 1902.

HENRY. E. PARSON.

Witnesses:

FRANCIS M. PHRLPS, SIDNEY R. PERRY.

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