US1685868A - Controller governor - Google Patents

Description

V. SCHLEYER CONTROLLER GOVERNOR Filed June 2, 1923 THEE/NE INVENTOR. War-0,? jC/MfYf/W,

ATTORNEY Patented @et. it,

"VICTOR SCHLEYER, h ANDERSON, INDIANA, ASSIGIQ'OR, MESNE ASSIGNMENTS, TO

DEAN HILL PUMP COMPANY, OF ANDERSON, INDIANA, it. CORPORATION OF IN- DIANA.

CUDTTEUIJIJER GOVERNOR.

ltt is the objectof my invention to provide a safety controller-governor for pumps; by which controller-governor it may be possible fundamentally to govern the speed of the it pump by varying the supply of steam to its driver in response to variations in the pressure produced by the pump as opposed by variations in the pressure of the steamsupply, to combine with this balanced-action W governing a safety cut-off which shuts oil. the supply of steam if the pressure produced by the pump fails, to obtain this safety cut-oif by a simple valve-construction operated by a given movement of the governing valve, and to provide a simple and effective setting device for use in starting the pump whether initially or after a safety cut-off.

In carrying out my invention 1 have had particularly in mind a safety controllen governor for feed-water pumps for boilers, and the specific embodiment of my invent on is particularly adapted for that purpose; but my invention is not limitedto pumps of that character, where it is essential that the pressure developed by the pump shall exceed the boiler pressure, but is adapted for the regulation and control of pumps of various kinds, both reciprocating and rotary.

According to my invention, I provide a floating balanced-valve construction which controls thesupply of steam to the turbine or other driver which operates the pump. 1 connect this floating valve to two pistons, which I prefer to have at opposite ends of the structure carrying the valve. One of these pistons is open to the steam-supply, and tends to move the valve in one direction. The other piston is acted on by the pressure of the water pumped by the pump, and tends to move the valve in the other direction. This second piston is smaller in effective cross-section than is the first when the device is used in. conncction with a feed-water pump, the ellective areas of the two pistons being inversely proportionalto the desired steam and water pressures. When the water-pressiu'e fails, and its piston thus ceases to act on the valve, the steam'pressure acting on its piston throws the balanced valve to one limit of its movement. According to my invention, a shut-off valve is associated with the balanced valve, and is arranged to be closed to Shut o f the steam supply to the driver of the pump when this movement of the balanced valve to such limit of movement occurs.

The balanced valve and the shut-off valve are arranged to be setin normal position by a manually controlled fluid-pressure device, to let steam pass to the driver of the pump. The safety cut-oil feature serves effectively to prevent the pump and its driver from running away, if the load on the pump is removed; and at the same time, this shut-off action does not interfere with the normal governing movement by which the supply of steam to the driver of the pump is controlled by the balancing of steam-pressure against water-pressure.

Some inventions shown in this application are described and claimed broadly in my copending application Serial No. 642,398, filed May 81, 1923. V

The accompanying drawing illustrates my invention: Fig. 1 is a semi-diagrammatic elevation of a turbine-driven centrifugal feedwater pump equipped with asafety controller-governor embodying 'my invention, with the controller-governor in section; and Fig. 2 is a sectional detail of the resetting control valve. I

The'pump is shown as a centrifugal pump, driven by a turbine 11. The pump 10 receives Water through an inlet'12 and discharges it through an. outlet 13; and when the pump is a feed-water pump, the inlet 12 is connected to the feed-water heater, and the outlet 13 is connected to the boiler, though my invention is not limited to pumps for that use. The steam for the pump-driving turbine 11 is supplied from. the'boiler through a. pipe 14, then through my safety controllergovernor 15, and thence by a. pipe 16 to the turbine.

My safety controller-governor has a main body-casing 20, in which a balanced valve 21 is movable perpendicularly to the general (ll? rection of steam-flow through the controller governor. 'lhis body-casing has an extension 22 to which the pipe 14 is connected, and in this extension 22 is the shut-0d valve 23, shown as of the butterfly type having an operating arm 24 connected to an operating rod 25. The operating rod 25 is connected at one end to piston-rod 26 eta piston 27 0P6??? ating in a cylinder 28, which at one end has a vent'29 and at the other end is connected to a pipe for supplying steam fluid under pressure to it, as for example the steam pipe 14. In the pipe 30 is a re-setting control valve 31 (shown in detail in Fig. 2) which valve 31 when in the re-setting position shown in Fig. 2 admits steam to the left-hand end of the cylinder 28 to move the. piston 27 to the right to open the shut-off valve 23, and when in its other position, shown in Fig. 1,

' with its operating handle 32 turned 90 in steam-chamber 39 of the balanced valve.

the counter-cloclnvise direction from the position shown in Fig. 2, shutsoif the supply of'steam through the pipe 30 andventsthe left-hand end of tjhecyhnder 28. I

Thefbody-casing 20'also has an inwardly extending hollow I outlet-boss 35, which is closed at its inner end and which at its outer endopens intothe pipe 16 leading to the turbine 11. This outlet-boss is'shown as substantially opposite the inlet pipe 14 and shut off valve 23,and I prefer that arrangement though it is not essential. A valve-stem 36 extends transversely through the outlet-boss .35, and carries two valve disks 37 and 38401 controlling the outflow 0t steam from the In the opposite walls of the hollow outlet-boss 85 are two'valve-rings 40 and 41, with which the valve disks 37 and38 co-operate to control such outflow of steam. These valve disks 37 and 88 are shown as connected by webs 42 for strength, and these webs serve the additional function of assistingin guiding the valve in its movements. The spacing between the valve-disks 37 and 38 is preferably the same as that between the two valve-rings 40 and 41, as is common in balanced-valve constructions.

on one end of the valve-stem 36 is a steam- .pist-on 45, and on the other end a water-piston 46. These two pistons 45 and 46 are slidable in cylinders 47 and 48 respectively. Onecnd 0f thesteam-cylinder 47 is open to the steamchamber. 39, so that the end of the piston 45 which is toward the valve-disk 37is exposed to the steam-pressure within such steamchamber. The steam-cylinder 47 on the other or outer side ofthe piston 45 is open to the atmosphere, through a draining vent-hole 49. The outer end of the water-cylinder 48 is also connected to the atmosphere, through a drain "hole 52. The innerend of such. water-cylinder 4 8 is connected by a pipe 53 to the-discharge pipe 13 leading from the pump 10, sothat the piston 46 "is acted on by the water-pressure developed by such pump. Between the adjacent ends of the water-cylinder 48 and the steam-chamber 36 there is a stuifing box 55.

Beyond the water-piston 46, there is an extension 36 of the valve-stem 36, which extension passes out through a stutfing box 56. The

outerendof'this valve-stem extension 36 carriesa cross p'in which receives the forked upper end61 of'a lever 62 mounted on a fixed esases pivot 63. The lower end of the lever 62 carrics a cross-pin 64 which projects through a slot 65 in the end of the operating rod 25, to provide lost-motion.

he operation of the device is evident. lVith the pump at rest, the shut-off valve will be closed, as indicated in dotted lines, it: such "alve is also used as the main control valve. To start the pump, the rc-sctting valve 31 will be turned to the position shown. to admit steam from the pipe 14 to the left-hand end of the cylinder 28. This steam acts to shift the piston 27 to the right, to an adjustable limit determined by an abutment screw 66 in the right-hand end of the cylinder 28. This movement of the piston 27 opens the shut-off valve 23. It also acts through the lever 62 to shift the balanced valve 42 from its farthest position toward the right to an intermediate or floating position, and to hold it there while the pump 10 builds u its pressure. Upon the opening of the valve 23, the turbine 11 starts to operate, to drive the pump 10. As soon as the pump 10 builds up its water-pressure, such water-pressure is transmitted through the pipe 53 to the water-cylinder 48, where such pressure acts on the piston 46 to tend to move it toward the left, in opposition to the tendency of the steam on the steampiston 45 to move it toward the right. As soon as this water-pressure is created, the valve 31 may be turned to its other position, to shut ofl? the steam from the cylinder 28. Then the balanced valve 42 floats under the opposed steam-pressure and water-pressure, acting on the two pistons 45 and 46 respectively, and is moved as is necessary to maintain a predetermined relation between two such pressures, thus governing the pump automatically. The water-pressure developed is higher than the steam-pressure, in feed-water pumps, so that the water may be injected into the boiler against such steam-pressure, and the relation between these two pressures is maintained reasonably constant by this automatic governing action. To obtain this higher water-pressure, when it is necessary because the device is used for feeding boilers, the effective size of the water-piston 46 is made smaller than the effective size of the steampiston 45, so that the effective areas are in inverse proportion to the desired pressures. If the water-pressure rises too high, its client predominates, and the water-piston 46 overcomes the steam-piston 45 and shifts the balanced valve 21 so that the valve-disks 37 and 38 are nearer the valve-rings 40 and 41, to cut down the supply of steam to the turbine 11 until the desired relation of steam-pressure and water-pressure is re-established. If the water pressure falls too low, the steam-pressure predominates. and the steam-piston 45 overcomes the water-piston 46, and shifts the valve to separate the valve-disks 37 and 38 farther from the valve-rings 40 and 41to admit more steam to the turbine 11 Lmtil the desired relation of steam-pressure to water pressure is re-established.

If anything happens to the water supply, either in the supply to the pump or in the discharge from the pump 10, so that the load on the pump is suddenly relieved, the result is sometimes a racing of the pump and turbine, and the production of destructively high speeds. In case the water-pressure developed by the pump 10 fails, myinvcnt-ion provides a safety device for preventing the pump and turbine from running away. If the water-pressure in the pipe 13 fails, for any reason, the waterpressurc against the piston 46 is immediately relieved. In consequence, there is no opposition to the action of the steam on the steam-piston 45, and such steam-piston is shifted quickly as far as it will go (to the right in Fig. 1), to an adjustable limit which is set by an abutment screw 67 in the end of the cylinder 47. This movement of the piston carries the balanced valve 21 with it, and opens such valve Wide. However, upon this excessive shift ing of the piston 45 and balanced valve 21 to the right, the resultant clockwise turning of the lever 62 by reason of its connection with the valve-stem extension 36 more than takes up the lost-motion in the slot 65, and

after taking up such lost-motion acts through the operating rod 25 to shift the latter and the piston 27 to the left and close the shutoff valve 23. This shuts off the steam supply for the turbine, and prevents the turbine and pump from destroying themselves.

After such shutting oif, the steam-supply may be reestablished, when the conditions are ready, by opening the valve 31, and resetting the valves 21 and 23 in the manner already described.

For manual shutting down, it is of course possible to have a manual control valve in the pipe 14; or 16. However, to get such shutting down more easily, I prefer to provide in the pipe 5?; a valve 70, substantially like the valve 31. This valve is normally in position to admit water therethrough from the outlet pipe 18 to the water-cylinder 48. By turning this valve 70 to its other posi tion, it disconnects the cylinder 48 from the pipe 12?, and connects it to a drain or vent. 'llhis maltes the water pressure on the waterpiston 46 fail, and causes the steam-piston 4:5 to move to the right under the now-unopposed stea1n-pressure; which. causes the closing of the shut-off valve 23 in the manner already described for the failure of the water-pressure acting on the water-piston I claim as my invention A Safety gQ sln r-contr ller for prestit sure producing pumps, comprising control means for controlling the supply of power to the driving means for a pump, means acted on oppositely by the pressure developed by the pump and by the pressure of said powersupply to shift the position of said control means to maintain a predetermined relation between said two pressures, and shut-oil means for shutting off the supply of power, said shut-off means being connected with said control means to be moved thereby to shutoil position by the movement of said control means which occurs when the pressure produced by the pump fails.

2. Ehe combination set forth in claim 1, with the addition of a lost-motion device which is included in the connection between said control means and said shut-off means.

3. The combination set forth in claim 1, with the addition of a power-operated device for resetting said shut-off means.

t. A safety controller-governor for steam driven water pressure producing pumps, comprising a valve for controlling the supply of steam to a steam-turbine driver for a pump, operating means for said valve, said operating means being acted on oppositely by the pressure of the steam and by the wator-pressure developed by the pump, and separate valve operably interconnected with said first valve and arranged to be moved to closed position to shut off the steam-supply for said driver upon the movement of said first valve which is produced upon failure of said water-pressure. v

5. The combination set forth in claim l, with the addition of a lost-motion device which is included in the connection between said two valves.

6. The combination set forth in claim 4, with the addition of a power-operated device for re-opening said second val e.

7. The combination set forth in claim 4:, with the addition of a cylinder and piston associated with said second valve, and a manual control valve for admitting steam to said cylinder and piston to cause re-opening of said second valve.

8. The combination set forth in claim it, with the addition of manual means for shutting off the pump pressure from said means for shifting said control means.

9. The combination set forth in claim 4t, with the addition of manual means for shutting off such water-pressure from said operating means.

in witness whereof, l have hereunto semy hand at Indianapolis, llndiana, this 29th day of May, A. D. one thousand nine hundred and twenty three.

' VICTOR SCHLEYER.

Images