US715924A - Apparatus for controlling pumping-engines. - Google Patents

Description

Patented Dec. I6, I902.

R. WRIGHT.

APPARATUS FOR CONTROLLING PUMPING ENGINES.

(Application filed Apr. 4, 1902.).

2 Sheets$heet I.

(No Model.)

WWW

Patented Dec. I6, 1902.

B. WRIGHT. APPARATUS FOR CONTROLLING PUMPING ENGINES.

(Application filed Apr. 4, 1902.)

2 Sheets-Sheet 2.

' (No Model.)

I fi l I'ivm Winwses m: ronms pawns co. PMOTO-UTNQ. wiaammm. D. c,

UNITED STATES PATENT OFFICE.

ROGER WRIGHT, OF NEWCASTLE-UPON-TYNE, ENGLAND, ASSIGNOR TO W. G. ARMSTRONG, WHITWORTH AND COMPANY, LIMITED, OF ELSWIOK WORKS, NEWOASTLE-UPON-TYNE, ENGLAND.

APPARATUS FOR CONTROLLING PUMPING-ENGINES.

SPECIFICATION formingpart of Letters Patent No. 715,924, dated December 16, 1902.

Application filed April 4, 1902. Serial No. 101,409- (No model.)

To all whowt it may concern.-

Be it known that I, ROGER WRIGHT, engineer, a subject of the King ofGreat Britain, residing at Elswick Works, Newcastle-upon- Tyne,England,have invented certain new and useful Improvements in Apparatus for Controlling Puinping-Engines, of which the following is a specification.

In hydraulic governors for automatically regulating the speed of steam pumping-engines by the pressure in the delivery-pipe from the pumps it is usual to employ a spring-loaded plunger on the delivery-pipe to directly actuate the throttle-valve.

According to this invention the throttlevalve is worked by a pair of steam-pistons acted on by live s'teamfrom the boilers, the admission of the steam to either piston being effected by a small valve actuated by the spring-loaded plunger. provide a speed-governor driven from the crank-shaft to act in conjunction with the hydraulic governor.

According to this invention the speed-gov ernor instead of having separate connections withthe valve, as heretofore, acts through the same connections as the hydraulic governor.

The arrangement is as follows: A hydraulic cylinder in constant communication with the delivery-pipe has a spring-loaded plunger, to which a lever is pivoted. One arm of this lever is pivoted to a rod connected to the speedgovernor, and the other arm is connectedby a rod to the control-lever, which actuates the throttle-valve of the pumping-engine. If, therefore, either the speed of the engine or the pressure in the delivery-pipe varies, the

governor-lever is turned about one or' other of its pivots, and the valve is suitably moved.

The throttle-valve is preferably of the miter type, having at each end a piston Working in a small cylinder. Live steam is admitted to one or other of these cylinders by a controlling-valve, whose rod has pivoted to it the controlling-lever, one arm of which is connected, as above mentioned, to the governorlever, While the other arm is pivoted to the rod of the throttle-valve. If, therefore, the

speed of the engine or the pressure in the de- It is also usual to the rod h to the end j of the leverj.

livery-pipe varies, so that the governor-lever is moved, the control-lever is moved also, at first turning about its pivot on the throttlevalve rod, so shifting the control-valve, and thereby admitting steam to one or other of the valve-cylinders, thus moving the throttle-valve. The throttle-valve rod during its movement carries the end of the control-lever with it, so that the control-valve becomes a huntingvalve and causes the throttlevalve to continue to open or close, as the case may be, until the speed and pressurebecome again normal.

By-pass pipes and a cock may be provided, so that sufficient steam can be allowed to pass the throttle-valve when closed to cause the engine to creep and not absolutely stop.

Figure 1 is a side elevation of the controlling mechanism, the crank-shaft being shown in section. Fig. 2 is a vertical section of the throttle-valve to a larger scale; and Fig. 3 is a section on the line 3 3, Fig. 2.

a is a hydraulic cylinder in constant communication with the delivery-pipe from the pump, and b is a plunger working in it.

c is a spring whose lower end bears upon the collar b, fixed to the plunger 17. The plunger is prolonged upward and has a lever d pivoted at d to its upper end.

v e is the crank-shaft of the engine, driving through the bevel-gear e an ordinary speedgovernor f, which operates a lever g in the usual manner. The lever g is pivoted at g, and its other end is connected by rods 9 g and the bell-crank lever g to the end (1 of the levergd, whose other end (i is connected by The lever j is also pivoted atj j to the rods 70' Z of the control-valve k and the throttle-valve l, respectively. The valve 70 is hollow and works in a valve-chest 10 while the ends of the valve Z work in cylinders Z Z Steam is admitted to the chest 70 from the steam-pipe m by the small pipe 70 The chest 70 has in it ports leading to annular passages 10 70 7c. The passage k is connected by the pipe 72 to the cylinder Z the passage 10 to the exhaust, andzi ahe passage 10 by the pipe 0 to the cylinder p is a by-pass pipe controlled by a cock p, admitting suflicient steam to the engine to allow it to creep and not absolutely stop even when the throttle-valve is closed.

If the water-pressure in the delivery-pipe increases, the plunger b rises and turns the lever d about the pivot 01 and, similarly, if the speed of the engine increases the governorfpnlls the end 01 of the lever (1 downward, turning the lever about the pivot d. In either case the rod h is pushed upward. The first result of this is to turn the lever j about the pivot 7' and pull the valve-rod k upward, thereby admitting steam into the annular passage 766 and the cylinder P, so forcing the throttle-valve downward and cutting off the steam. This movement of the throttle-valve lowers the pivotj so that when the rod h again descends, owing to the decrease of the speed or water-pressure, steam is at once admitted to the cylinder and the throttle-valve is opened.

What I claim is 1. The combination of a throttle-valve, a cylinder, a piston in the cylinder operating the throttle-valve, a valve admitting steam to the cylinder, stems to the valves, a pressure-governor, and a lever connected to the two valve-stems and to the governor, the arrangement being such that the steam admitted to the cylinder by the movement of the admission-valve in one direction tends to move the throttle-valve in the opposite direction.

2. The combination of a throttle-valve, a cylinder, a piston in the cylinder operating the throttle-valve, a valve admitting steam to the cylinder, stems to the valves, a speedgovernor, and a lever connected to the two valve-stems and to the governor, the arrangement being such that the steam admitted to the cylinder by the movement of the admission-valve in one direction tends to move the throttle-valve in the opposite direction.

3. The combination of a throttle-valve, a cylinder, a piston in the cylinder operating the throttle-valve, a valve admitting steam to the cylinder, stems to the valves, a pressure-governor, a speed-governor, and a lever connected to the two valve-stems and to the two governors.

4. The combination of a throttle-valve, a cylinder, a piston in the cylinder operating the throttle-valve, a valve admitting steam to the cylinder, stems to the valves, a pressure-governor, a speed-governor, a lever connected to the two valve-stems, and a second lever connected to the two governors and to the first lever.

5. The combination of a throttle-valve, two cylinders in Which the ends of the throttlevalve work, a valve admitting steam to the two cylinders, stems fixed to the valves, alever pivoted to the stems, a second lever, a connecting-rod pivoted to the two levers, a hydraulic cylinder constantly open to the pressure in the delivery-pipe, a plunger in the cylinder pivoted to the second lover, a spring acting on the plunger, a speed-governor, and connections between it and the second lever.

ROGER WRIGHT.

Witnesses:

Z. D. FENWICK, CHARLES WEBSTER.

Images