US786984A - Governing device. - Google Patents

Description

No. 786,984. PATENTED APR.11,1905.

v R. B. MOGOWAN.

GOVERNING DEVICE;

APPLICATION FILED DEO.13. 1904.

s SHEETS-SHEET 1 No. 786,984. PATENTED APR. 11, 1905.

I R. B. MoGOWAN.

GOVERNING DEVICE.

APPLICATION FILED DEO.13, 1904.

3 SHEETS-SHEET 2..

7176 7J0]? 5. av'wm PATBNTED APR. 11, 1905., R. B. MOGOWAN. GOVERNING DEVICE.

APPLIOATION FILED mam-1a. 1904.

- s SHEETS-SHEET "s.

U .lnzjenfor.

ROBERT B. MCGOWAN,

Patented April 11 1905.

PATENT OFFICE.

OF CINCINNATI, OHIO.

GOVERNING DEVICE-- SPECIFICATION formingpart of Letters Patent No. 786,984, dated April 11, 1905.

Application filed December 13, 1904. Serial No. 236,786.

To all whom, it may concern:

. Be it known that 1, ROBERT B. MoGowAN,

the following is aspecification.

My invention relates to two classes of gov ernors: first, those for pumps usedin rais- 1ng water, compressing a1r, &c., operating against a head or pressure where the pressure is utilized to regulate and control the supply of steam or other motive power to the motive machinery, and, second, those adapted to regulate the pressure of steam, liquids, air, or gas within a pipe-line, in which case the mechanism at the receiving end of the device is connected with and operates to control and regulate the passage of steam, air, gas, or liquids through the delivery end of the device, and constitutes an improvement upon the invention shown in Letters Patent No. 780,682, issued to me June 9, 1903.

My improved device illustrated and described herein has certain advantages over the earlier type, whereby, first, the spring used to secure regulation of pressure is removed from contact with corrosive elements by placing in a dry separate case; second,

through .the lever and its attendant parts is secured a greater scope of pressure regulation and quick easy readjustment of the same. These tend to secure most positive and perfect action, wider range of efficiency, added durability, economy and simplicity of construction, and ease of adjustment.

I Fig. 3 is a perspective view of the forked end of the lever with attendant valve-stem in section and shows depression in lever adapted to receive pivot. Fig. 4 is a sectional elevation of the governor-chamber detached. Fig. 5 is a corresponding erspective view of the cylindrical throttle-Va ve detached. Fig. 6 is an adjustablepivot-point and lock-nut. Fig. 7 is an elevation of a portion of the lower part of. the spring-case and means of securingsame to the lever and bar, with said lever, bar, and the cross-head in section. Fig. 8 is an axial section of the cross-head that is set on the stem.

In the particular embodiment of myinvention selected for illustration in the drawings, A designates the governor-chamber, containing a throttle-valve B, and a, a governorbody cap, with 01," the upper valve-stop, cast thereon. V

O designates a yoke-frame swiveled at its lower connection-plate a, so, as to turn freely upon the cap a, or rather the boss a thereon. Said yoke and its connection is held in swiveling position to governor-chamber by setscrew 7). The yoke terminates at the top in a plate a, which has rigidly attached to it the pressure-cylinder D, which is provided with a piston E operating therein. This piston is attached to the upper portion of the valvestem F, which extends downward past the flange d of the pressure-cylinder D; the yokeplate 0, the swivel gland packing nut G, which is threaded into the plate 0; the swivel gland-packing nut G, which is threaded into the cap a, the plate 0; the boss a, cap at, its valve-stop a, and the throttle-valve B. The stem F at a point between G and G is operatively connected with a lever I-I, preferably by having said lever so placed that its fork It extends on each side of a circumferen tially-grooved cross-head f, adapted to be adjusted at any point on the stem F. One or more set-screws secure the cross-head f to the stem F, and the cross-head movably connects the lever H and the stem F. The

stem F throughout the portion that extends through the valve B is preferably reduced in circumferential size to provide a shoulderf, upon which a washer I seats, against which the valve B seats. The valve B is held in place by the washer I, the nut J, and the lock-nut J.

The governor-chamber A has a wall a hollowed cylindrically to form an opening for the vertical movement of the valve B. This wall, which for facility in casting I prefer to make of a separate shell and force or thread into position, hasvacant zones (1 so arranged as to be capable of registering with the similar Zones 1) in the valve B. The number and arrangement of these zones may be changed to accord with the travel and regulation desired. The inlet-port is designated as A and the exit-port as A On the wall of the governor-chamber near the upper end of the exit-port A is an extension of said wall, a, which acts as a lower stop for the throttle-valve B.

The side wall a of the governor-chamber A is continued around the shell a to form an annular passage for the steam-supply and is provided with an aperture X, controlled by a by-pass valve K, which makes it possible to admit steam to the pump independently of the governor for "warming up before starting and to accumulate pressure that the governor may resume its regulation without readjustment when set to close on complete diminution of pressure.

The throttle-valve B is constructed as follows: It is in the form of a cylindrical shell 1), partially cut away circumferentially into zones 1), through which steam admitted through a finds free passage through the exit-port A Two or more radial arms I) connect the cylindrical shell I) and the axial socket or hollow stem 1). A radial-disk connection b may be used to add rigidity to the valve, and this disk partition will be pierced with drain-holes If.

The pressure-cylinder D has at its lower end and beneath the actuating-piston E an inlet-aperture (Z connected to the tank or deliverycolumn, (not shown,) the flow from which may be regulated by the globe-valve L.

An outlet-aperture d connected to an external aperture and waste-pipe (Z is governed by a direct-seating valve (1. The pressurecylinder D is provided with a drain-passage D outside the cylinder-chamber, which is connected with the cylinder-chamber above the piston E by a perforation d to take off any accidental leakage past the piston E and to prevent back pressure caused by an accumulation above the piston of whatever is being fed to pressure-cylinder.

The screw-cap forming the top of the pressure-cylinder is designated as D and is loosely pierced axially by the upper extremity of the stem F. The length of the stroke of the valves is regulated by screwing the valvestop M up or down on the upper threaded extremity of the stem F, and the said stop is secured in any desired position by the locknut N.

Through one side of frame of the yoke C is an opening 0 through which the lever ll passes and where it is pivoted by pivot to permit of its vertical oscillation. The pivot is preferablyformed of set-screws 0, whose i11- ner ends are conical in shape to I it corresponding depressions it in the lever l-I. \Vhen these screws are adjusted, they are held in position by lock-nuts 0. Preferably above the opening 0 ,011 the sideframe of the yoke, is pro jected, preferablyat right angles to said yokeframe, a bracket CZhaving vertical slot 0.

Slidably adjustable upon and removable from the bar C and the lever H is a telescopic compressible spring-case P and connections. The lower portion of this case P is tubular, with an extension adapted to iit the slot (1, is finished cylindrically, and threaded at its lower end. P also has, preferably, the edge of its upper end chamfered to avoid catching contact with any of the spring-coils. Into this portion P of the case P is placed. a suitable coiled spring Q, and the upper tubular portion P of the same case P is placed over it, so as to shut down over P telescopically. The upper end of P is pierced axially to allow entrance of the hollow compressionscrew lt, upon which and within P a swivel-plate r is held in position by nut r, and upon the under side of plate r the spring Q seats. The compression-screw is raised or lowered by means of the hand-wheel R and is held in any desired position by the lock-nut It. An, interior guide-bar y, fixed to the bottom of P, is preferably extended upwardly through R and secures the vertical movement and telescoping of the spring-case. By trunnions p, projected from the exterior of the lower end of P are depended shackles T, whose lower ends are pivoted to the cross-head U by thumb-screws t, which hold cross-head in position at any desired point along the lever II and permit free upward and downward movement of the lever.

The shackles provide for the travel of the cross-head off the perpendicular line, due to the are described by the movement of the le ver, without effecting the direct vertical movement of the spring-case.

Ordinarily the spring-case P and the crosshead U are set, preferably, at a point on the lever corresponding to the distance represented between the center of the valve-stem. and the lever-fulcrum, but may be set without readjustment at any point throughout the length of the bracket affording a range of pressures greater than that required for regular service. Thus, for example, perfect re ulation is secured in waterworks plants during fire-service, when the liability of breakthe tension of the spring Q. When there is such an amount of pressure against the under side of the piston E, then said piston will rise, carrying with it sternFand forked end of lever H, thus depressing the outer end of lever H and compressing the spring Q. The-- stem F in rising will carry With it the throttle-valve B, admitting steam through a b, and A to the engine. By proper regulation of the adjustable parts it is obvious that the device may be set to maintain the pressure necessary.

If the pressure in cylinder D is excessive, the piston E will rise, carrying stem F and valve B until said valve is carried upward far enough so that the steam is again shutoff, thus avoiding danger to mechanism when one class of breakages occur.

On decrease of pressure the spring-pressure overbalances the water-pressure, and the upward movement of lever H and corresponding depression of valve-stem F and all attendant parts result to the point of cut off. These two forces operating upon the device should be adjusted to balance, so as to maintain a desired working pressure. The adjustment of the spring tension and the setting of the valve-stop is effected in a manner similar to that in my former patent referred to.

Obviously changes may be made, such as admitting steam or other pressure above the piston E and placing the bar C beneath the lever and inverting the spring mechanism and many changes of like effect, without departing from the spirit of the invention.

I claim as my invention and desire to secure by Letters Patent of the United States-- 1. In a governin device of the character indicated, the com ination of a governor chamber and a throttle-valve therein, a throttle-valve stem, extended as a piston-rod, a piston on said extended stem operating one way within a pressure-cylinder, said cylinder adapted to receive pressure, an adjustable spring located at a point outside of and not in contact with the contents of the pressurecylinder, a case inclosing the spring and composed of telescoping sections, means for operatively connecting said valve-stem and the movable member of the spring-case whereby the spring is actuated to secure pressure opposite that against the piston in the pressure cylinder, substantially as set forth.

2. A pump-governing device embodying a throttle-valve adapted to register at normal pressure and to shut ofi at cessation or excess of pressure, said valve having its operating-stem extended as a piston-rod into a pressure-cylinder, apiston upon said rod actuated in said cylinder in one direction only by the resistance head or pressure, a lever movably attached to said valve-rod, said lever fulcrumed to a fixed point in said device,- an ad.- justable spring adapted to actuate the piston valve-rod in the direction opposite the movement caused by the pressure and swiveling supporting means for the spring, the pressure-cylinder and the lever, substantially as set forth. 1

3. In a pump-governin device of the character indicated the combination of a gov- I ernor-chamber and a throttle-valve therein, a

throttle-valve stem extended as a piston-rod, a piston on said extended stem operating one way within a pressure-cylinder said cylinder adapted to receive pressure, an adjustable spring located at a point outside of and not in contact with the contents of the pressurecylinder and meansfor operatively connecting said valve-stem and said spring to secure pressure opposite that against the piston in the pressure-cylinder, and all the mechanconnected to said governor-chamber, substantially as set forth. j

' 4. Inapump-governing device of the character indicated, the combination of telescopic spring-case, P, the spring, Q, the adjusting mechanism, the shackles, T, the cross-head, U, the bracket, 0 and means for pivotally securing said shackles to said spring-case and cross-head, substantially as setforth.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

ROBERT B. McGOWAN.

Witnesses:

JosEPH R. GARDNER, WALTER A. KNIGHT.

ism without the governor-chamber, swivelly

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