US1050006A

US1050006A - Governing mechanism for low-pressure turbines.

Info

Publication number: US1050006A
Authority: US
Inventors: Ludwig Cubelic
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1911-06-07
Filing date: 1911-06-07
Publication date: 1913-01-07
Anticipated expiration: 1930-01-07

Description

- L. GUBELIO.

GOVERNING MECHANISM FOR LOW PRESSURE TURBINES.

' APPLICATION FILED JUNE 7,1911. 1,050,006, Patented Jan.7,1913.

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under pressure is admitted to the upper side of the piston restores the pilot valve to its normal position by moving it downward. Assuming now an increase in pressure of the steam supply, the load remaining constant, oil will be forced into the chamber 23 and separate the pistons. Since the fluid above the piston cannot escape because the port 21 is closed, the etiect of the increased pres sure is to force the lower piston ll-down- Ward against the spring 28 and close the valve ,7 by an amount that 'is proportional to the increased pressure. If the pistons 11 and 12 are separated, a decrease in steam pressure will permit the lower piston 11 to rise forcing oil out of the cylinder and open the valve Wider, thus restoring the parts to equilibrium. When the pressure-responsive feature of the apparatus is in operation the pistonlQ forms an abutment Which is stationary, changing its position only with a change in speed. Of course speed and pres- .sure changes may take place simultaneously,

but for the sake of simplicity the operations have been described separately.

it is a des able arrangement to use a column or liquid to transmit the effects of changes in pressure from the steam supply to the cylinder because small piping can be used and the cylinder located Where it is the most convenient. have illustrated the prcssure-responsive means diagrammatically for the purpose of simplicity. It is to be understood, however, this feature of my invention can carried out by any other suitable means which will cause the lower piston 11 to act in the manner stated. In the normal operation of my invention, the pistons 11 and 12 will usually be separated to a greater or less extent.

My improved governing mechanism is quick and positive in its action, s simple 1n construction when viewed in the light of the complex governing problem presented and the regulating valve .is responsive both to speed changes and to changes in pressure of the source of supply. It is obviously of material advantage in the Way of simplicity and reduced cost to use one and the same valve for controlling both for speed and pressure changes. Furthermore, my improved 'mechanism includes an emergency device responsive to abnormal pressure because, if the pressure in the accumulator exceeds a predetermined value, the oil acting on the piston 11 will close said valve.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together With the apparatus Which I now consider to represent the best embodiment thereof; but I desire to have it understood that the aption of the valve under paratus shown is only illustrative, and that the invention can be carried out by other means.

VVhatI claim as new anddesire to secure by Letters Patent of the United States, is m In a governing mechanism for turbines, the combination of a controlling valve, motors that simultaneously act to move the valve under one operating condition, and -1neans for causing one of the motors to move independently of another to vary the posiother operating ponditions.

2. In a governing mechanism for turbmes,

the combination of a controlling valve, 30

motors Whose movable members act in unison to move the valve toward and away from its seat under one operating condition, means" for applying force to move the members in one direction, means. acting inopposition 35 to said force, and fluid pressure means for causing one of said members to move the valve to the exclusion of the other Tnember.

3. In a. governing mechanism for turbines,

the combination of a controlling valvefa 9e pair of pistons, a means connecting one of the pistons With the valve, acylinder common to the pistons, means responsive toan operating condition for moving the pistons in unison in one direction, means formov- 55' ing them in unison in the opposite direction,

and means admitting fluid under pressure between the pistons to move one ofthem independently of the other.

4. In agoverning mechanism, the combinationof a controlling valve, motors for -operating the valve that operate simultaneously and also independently to move said valve, a speed-responsive device for controlling the simultaneous operation of the motors, and 'means for subjecting one of the motors to the effects of the pressure of the source of supply controlled by said valve for moving it independently of the said device.

5. In a governing mechanism, the com- Elli] bination of a controlling valve, means for operating it comprising two principal- 1nemhere, one of Which is mechanically connected to the valve, the second acting through the first to move the valve, a speed governor controlling the second member, and means .for subjecting the first member to the effects of the pressure'of the source of fluidsupply controlled by said valve for mov ing it.

6. In a governing mechanism, the combination of a controlling valve, a cylinder,'independent pistons therein, a means connect-- ing one of the pistons t0 the valve, means admitting fluid under pressure between the pistons, 21. pilot'valve controllingthe movements of the second piston, said second piston communicating its movements to the valve through the first piston, a speed governor for controlling tlie--pil0t valve, and

7 open the valve.

means acting in opposition to the pistons to T. In a governing mechanism, the combination of a controlling valve, a cylinder, a pair of mechanically independent pistons mounted therein, a means connecting one of the pistons with the valve, conduit means connnnnicatingthe pressure of the source of supply controlledby the valve to one side of the piston, means acting on the piston in opposition to said pressure, a conduit means the pistons with the valve, conduit means communicating the pressure of the source of supply controlled by the valve to the space between the pistons, a means acting on the piston" connected to the valve. in opposition to the fluid under pressure, a conduit ad-.

said pressure.

mittiiig fluid under pressure to the cylinder space above the second piston, said piston as it moves the valve overpowering the opposition means, and a speed governor controlling movements of the second piston.

9. In a governingmechanism for turbines, the combination of a controlling valve, a pair of pistons, a cylinder common to the pistons, a speed governor, a pilot valve controlling the admission of fluid to the. cylinder, a governor lever connected to the pilot valve and to one of-the pistons ,a means con? necting the other iston and the controlling valve, a conduit or conveying fluid under pressure to the space between the pistons, said pressure varying with that of the fluid controlled. by the valve and the first named piston acting as an abutment for said pressure, and a means that acts :in opposition to 10. In a governing mechanism, the, com-- bination of a controlling valve, a cylinder, independent pistons mounted therein and separated bya column of;fluid, means for pistons, a governor for controlling the ad mission of motive fluid to one of the pistons tween, and an agent which opens the valve when the pressure controlled by the overnor o-r that from the means is reduced.-

11. In a governing mechanism for low I pressure turbines, the combination of a valve, mechanism for actuating the valve in ating the same valve in response to pressure changes of the fluid supplied to the turbine, and an agent that tends to open the valve 12. In a governing mechanism, the combination of a valve, mechanism for actuating the valve'in response to speed' changes, means for actuating the valve in response to pressure changes that-is mechanically independent of said mechanism, a means for of the fluid supply to the. first named means,

and an agent that tends to open the valve.

13. In a governing mechanism for low pressure turbines, the combination of a main hydraulic cylinder, a pair of pistons arranged in the cylinder and separated by a chamber formed between their adjacent the rods being connected to the main valve, a pilot .valve for controlling the supply of liquid to and its exhaust from the region between the piston that is not connected to the valve and the adjacent end of the cylinder, a speed governor for actuating the pilot valve, means responsive to variations in the supply of low pressure steam for regulating the flow of liquid to and from said chamber, and spring means arranged between the other end of the cylinder and the piston which is connected to the main valve that tends to open said valve.

In Witness whereof, I have hereunto set my'hand this twenty day of May, 1911.

LUDWVIG CUBELIC.

WVitnesses Fninnnrorr GANZERT,

varying the amount of fluid between the O'r'ro SCHMIDT.

for an improvement in appears in the printed specification record ot' 'the case in the Patent Ofiice.

[SEAL] It is hereby certified that in Letters Patent No. 1,050,005, granted January 7, 1913,v upon the application of Ludwig Cubelic, of charlottenburg, Gerrnany, Covering Mechanism for Low-Pressure Turbines, an error I v requiring correction as follows: Page 1,line" 1: tor the word responsible read responsive; and that the said Letters Patent the same may conform'tothe Signed and sealed this 11th day of February, 1913.

C. C. BILLINGS.

110mg Commission of Patent faces, a piston rod for each piston, one of to cause it to move the valve through the, other piston and the column of fluid be response to speed changes, means for oper- 85 against the closing action of said means.

conveying the effect of changes in pressure valve,.means for actuating it comprising a 7 open the valve.