US752581A - Damper-regulator for steam-boilers - Google Patents

Description

PATENTBD PEB. 16, 1904.

APPLICATION FILED 1\[AR.30 1903.

NO MODEL.

1 w w m. my qw c Vm@ c l r mf f. L. 1 I l. .N l Y A@ QN um, m\ QM nq Ov my@ \O.v N M NN w mm @an UNITED STATESN 4Iatented February 16, 1904;

PATENT OFFICE.-

` ISAAC E. OSMAN, OF GREENSBURG, INDIANA.

DAIVIPERREGULATQR FOR STEAM-BOILERS.

SPECIFICATION forming part of LettersPatent No. 752,581, dated February 16, 1904.

Application filed. March 30, 1903.

To @ZZ whom t may concern.'

Be it known that I, ISAAC E. OsMAN, a citizen of the United States, residing at Greensburg, in the county ofDecatur and State of Indiana, have invented certain new and useful Improvements in Damper-Regulators for Steam- Boilers, of which the following is a specication.

This invention aims, broadly, to provide efiicient damper-regulating means for use in connection with steam-boilers for controlling through the medium of the said damper thev amountof steam-pressure maintained in the boiler. Y

The special structure utilized is a peculiar form of valve for automatic actuation of a piston, the damper being connected by suitable means to the piston, which is adapted to close the damper when the pressure of steam reaches an ascertained height and to opeh the damper when the pressure lowers, in a manner which will appear more clearly as the descripi tion proceeds.

l may also be accomplished through adjusting means acting directly upon the piston, `and the movement of the latter is adapted for adjustable limitation whereby the regulator may be used in connection with small and large sized dampers, .requiring variable throws of the piston to open and close them.

For a full description of the invention and the merits thereof and also to acquire aknowledge of the details of construction of the means for effecting the result reference is to be had to the following description and drawings hereto attached. c

While the essential and characteristic features of the invention are susceptible of modiiication, still the preferred embodiment of the invention is illustrated in the accompanying drawings, in which- Figure 1 is a sectional view through" the regulating attachment, showing the relative `Serial-No. 150,218. (No model.)

arrangement of the parts. Fig. 2 is a side elevation showing the regulator applied to the rear end of a steam-boiler, and particularly `the connections Vbetween the damper and theV regulator in their preferred disposal. Fig. 3

is acsectional view, parts broken away, of the piston, showing the end of the piston-rod adjacent thereto in working position. Fig. 4 is a detail perspective view of the specific form of packing-rings. used upon the piston.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

The regulator is shown applied to the rear portion of a traction-engine boiler, it being understood, however, that the attachment may be utilized upon any boiler construction. The

boiler 1 is provided witha steam-pipe 2, upon n the upper part thereof, said pipe connecting with the steam-space of the boiler to permit thel regulation of the device by variation in the pressure of the steam, so that upon excess of this pressure the damper 3 may be closed and the pressure consequently decreased. The lowering of the pressure of the steam permits automatic'opening of the damper 3 to increase the draft and raise the said pressure to the desired point. Connected to the steam-pipe 2 4is an ordinary T-pipe 4, fromwhich extend a valve-casing 5 and a cylinder 6. The valveleasing 5 is connected to the T-pipe 4 by a screw-plug 7 and the cylinder to the said casing by a corresponding plug 8. The valve 9, disposed `within the valve-casing 5, is of the two-seat type and is adapted for operation by j screw cap 15.

in the upper portion of the valve-casing is adapted to bear against the block 12, and by manipulation of a screw-cap 15 at the upper end of the casing the said sleeve serves to clamp the blocks 12 and 10 and the interposed spacing-ring 16 together against the plug 7 in a manner which will be readily apparent. The Valve 9 is provided upon its upper side with a tubular portion 17, which receives the lower reduced end portion of the valve-stem 18. An extension upon the lower side of the valve 9 moves in the opening in the block 10 and serves to guide the valve to an ascertained extent in its longitudinal adjustment. Slots 20 upon the tubular portion 17 of the valve and the lower extension 19 aiiord means for passage of the steam to the actuator-piston 21 and through outlets 22 at the upper end of the casing and in the cap 15. The valve-stem 18 extends within a threaded tubular regulating-stem 23, adjustably mounted in the opening in the The tubular stem 23 bears against a guide-ring 24, which receives the upper portion of the valve-stem 18, and a tension-spring 25 is interposed between the guidering 24 and a nut 26, screwed upon the reduced portion of the stem 18. The valve is normally held tothe lower seat 11 by the tension of the spring 25, the said tension ofthe spring 25 being increased or decreased by means of adjustment of the threaded tubular stem 23, so that the valve 9 is held to its seat by regulable means which may be so adjusted f that the valve is permitted to move when any ascertained point of pressure of steam is reached within the boiler. A steam-pipe 27 extends from the valve-casing to conduct steam to the cylinder 6 for actuation of the piston 21. The steam-pipe 27 directly connects with the plug 8, by which the T-pipe 4 and the cylinder 6 are joined, a suitable screw-cap 28 being used, to which a branch of the pipe 27 is secured. The plug 8 is provided with a steampassage 29 therein,which conveys the steam to the cylinder. In order to regulate the amount of steam directed against the piston, a needlevalve 30 of ordinary type is disposed within the length of the steam-pipe 27 and may be regulated so as not to permit the steam to pass with too great pressure intothe cylinder, since such pressure would of course cause a quick movement of the piston and perhaps close or open the damper in a manner which would be detrimental to the working thereof and, indeed, might cause breakage in the connections between the piston and the said damper. The piston 21 is entirely separate from the piston-rod 31, being provided with an angular recess 32, in which the rounded end portion 33 of the piston-rod 31 works. The structure of the piston and piston-rod is essentially advantageous in that a certain amount of play is permitted the piston-rod and the binding of the piston within the cylinder is reduced to a minimum. In order to cause the piston to move in an approximately Vproper position within the cylinder, a guide-ring 34 is located adjacent the roundedV end portion 33 thereof, this guidering being rigidly held in place by any suitable means. The piston 21 remains normally in position shown when the damper is held open. The end of the cylinder is closed by a screw-cap 35, in which are mounted screwsleeves 36 and 37. The sleeve 36 is provided upon is outer periphery with screw-threads and is adapted to be adjusted within the sleeve 37, which is threaded both upon its inner and outer peripheries, the inner threaded portion interlocking -with the threaded portion of the sleeve 36, and the outer threaded portion cooperating with a threaded opening of the cap to permit of adjustment of the said sleeve in and out of the cylinder. The sleeve is closed at its outer end, as shown -at 38, and a tensionspring 39 is disposed between the headed end of the sleeve 36 and guide-ring 34 upon the piston -rod. The spring 39 holds the end 33'of the piston-rod in contact with the piston 21 and serves to normally hold the said piston in such a position that the damper is opened, as illustrated in the drawings, the position of the piston in Figfl being that in which it normally lies and assumes to maintain the damper open. The sleeve 37 is a stop-sleeve and limits the outward movement of the piston to close the damper. This sleeve being adjustable it may be made to adjustably limit the throw of the piston, and thus adapts the attachment for application to boilers having large and small dampers, a small damper naturally requiring a comparatively small throw of the piston and a large damper the converse. The piston-rod 31 connects with a bell-crank lever 40, pivoted to the upper portion of the boiler, and a connecting-rod 41 connects the damper to the other end of the bell-crank lever 40. In large dampers it is desirable to use means, such as the spring 42, to bear against an arm ofthe bell-crank lever 40 to .assist the spring 39, which is disposed within the cylinder, to return the piston to its normal position. However, this spring need not be utilized when the device is attached to boilers having small dampers. l The piston is provided with peculiarly formed and disposed packing-rings 43, as shown in Fig. 4. The packing-rings are disposed side by side atintervals along the piston, it being preferred to use two widths of packing-rings at each interval. The rings upon which the most wear is received are two in number, as shown at 43, the thickness of the rings 43a together amounting to the thickness or' one of the rings 43, the openings of the double rings not registering. The outer of the rings 43a is thicker than the inner-disposed ring, since IOO IIO

all the wear is upon this ring when a piston of the character shown in this attachment is utilized. When the wear is from both ends of the piston, a double packing-ring would be placed upon either side of the single packingring for reasons which will be readily comprehended.

In the operation of the regulator the steam enters at A, passes into the valve-casing 5, and when the pressure reaches an ascertained height the steam forces the valve 9 from its lower seat, on which it is normally held by the spring 25, and against the upper seat 13. Free passage is thus permitted through the steampipe 27 to the cylinder 6 and against the .piston 21. The piston is forced by the pressure of the steam outward to an extent as limited by the stop-sleeve 37, and the piston-rod acting upon the bell-crank lever and through the medium of the connecting-rod 41 closesithe damper down upon the damper opening. This position is shown in Fig. 2 of the drawings. The fire having gone down somewhat, the amount of pressure within the steam-space of the boiler decreases. vThis decrease of steam-pressure immediately affects the valve 9, and same is moved down upon its lower seat under the influence of the spring 25. The steam-pipe connects with the valve-casing at a point between the location of the valve-seats 11 and 13, and thus lowering of the valve to the seat 11 opens the way `to the passages 20 upon the upper tubular portion 17 of the valve, and the steam is permitted to escape through this passage to the upper portion of the valvecasing and out through the openings 22 in the cap 15 of said casing. Thus the piston within the cylinder isrelieved from the pressure of the steam within the cylinder and is returned automatically through the spring 39 to its normal position upon the damper. The regulator is entirely automatic in its operation, and the inventor is not restricted to the exact formation of the structural parts shown in the drawings, but may change the same to concord with the spirit of the invention and the scope of the appended claims.

Having thus described the invention, what is claimed as new is- 1. In an automatic damper-regulator, the

combination with an actuator-piston, a valvement of the guide-ring to regulate the tension of the spring adjacent the valve-stem.

2. In a damper-regulator, the combination with an actuator-piston, for actuation by a pressure medium, valve means for regulation of the aforesaid pressure medium, and means for positive engagement with the piston to limit the movement thereof, whereby the throw of the piston may be adjusted and the regulator means applied to different-sized dampers.

3. In a damper-regulator, the combination of a cylinder, an actuator-piston arranged therein, for actuation by a pressure medium, valve means for regulation of the aforesaid pressureV medium, and adjustable stop means arranged upon the cylinder and adapted for positive engagement with the piston to adjustably limit the movement thereof.

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

ISAAC E. OSMAN. [1.. s] Witnesses:

,DAvD A. MYERS,

ADDIE WILER.

Images