US2347471A - Supplementary auxiliary apparatus for prime movers - Google Patents

Description

April 25, 1944. F. L. DORNBROOK 3 5 SUPPLEMENTARY AUXILIARY APPARATUS FOR PRIME MOVERS Filed Feb 6, 1942 2 Sheets-Sheet l 61 57 *w "G i E]:- v 3334 ATTORNEYS.

April 1944- ,F. DORNBROOK 7,

SUPPLEMENTARY AUXILIARY APPARATUS FOR PRIME MOVERS Filed Feb. 6, 1942 Z She ecS-Sheet 2 INVENTOR.

ATTORNEYS.

Patented Apr. 25, 1944 SUPPLEMENTARY AUXILIARY APPARATUS FOR PRIME MOVERS Frederick L. Dcr brook, wa kee Wis, assianic to Wisconsin Electric Power Company, Milwaukee, Wis., a corporation of Wisconsin Application February 6, 1942, Serial N9, 429,762

3 Claims Steam turbines are usually provided with oil pumps for the hydraulic operation of their governors and lubrication of their bearings. Emergency oil pumps are also provided for furnishing the pressure fluid for governor operation and bearing lubrication in case the regular oil pumps fail. Various means have been provided for driving the emergenc oil pumps, but these have not always been foolproof, particularly where the emergency oil pumps are steam turbine driven. i

in central vertical section while one of the parts is taken on the section line 3-3 of Fig. 2.

In the drawings, the numeral 5 designates the steam turbine and 1 and .8 the oil pum s for the hydraulic operation of it governor and lubrication of its bearings, respectively, these pumps usually delivering at difterent hydraulic pressures and being driven direct by the turbineas through a, worm gear 9 or other suitable form of drive connection therewith. The hydraulic fluid ,for operating the governor I is supplied to the pump I from a suitable source of supply through a pipe II and delivered to the governor through a pipe I2. The lubricant for the turbine is supplied to the pump 8 by a supply pipe I3 and delivered to the bearings l4 of the turbine through piping I5.

In case either of the regular oil pumps fail, provision is usually made for cutting in one or more emergency oil pumps for furnishing the fluid for hydraulic operation of the governor of the main turbine and the lubrication of its bearings, and in the drawings the numeral I6 in each instance designates one of these pumps which is adapted to be directly driven by a small emergency steam turbine II. Each of the turbines I1 is connected through a pipe I8 with a main steam supply pipe I9 which, as shown in Fig. 3, is provided with a shut ofi valve 29. The oil pumps I6 furnish both the hydraulic pressure fluid and the lubricant. For bringing the oil deliverecl by these pumps down to the lower lubrieating pressure, the section 2I of the delivery 55 piping from the pumps it which connects with the piping. I receives its oil through a reducing valve 22 connected with the deliver pipe 2-3 of the pumps It. A branch pipe 24 supplies the pressure fluid to the pipe I 2. lassage of hydraulic fluid from either the pump 1 or the pump to the pumps L6 :while th -pumps I or 8 are in operation is prevented by che k valves 25 in t p pi g :3. Pass ge of hy rau i fluid f ith r of the umps IE to either I or 18 when ei h o the pumps I6 a e m p smt is e n e by heck valve 6., one o thes b ng the p n t and the e he e n i the ipin -l 2.

'The subject of this invention is especially concerned with the control of the cut oiT valve 29. In the present instance this valve 29 is mounted in a closed position by connection of its slidably oun ed stem 21 w a p ston .28 sl dably m nted in the bo e of a cyl nde 29 havin a lower closed end 3 which co th ou h a P and piping 32 having a three way valve 33 adapte to c nnect by a i e th th p ne 4 in one position of the valve and with a waste pipe 35 in the other position of said valve. 'The cylinder 29 has an end cap 36 forming a support for the housing 31 for the valve 20, this housing being carried by upright studs 38 mounted on the cap 36. The stem or rod member 21 fOl the valve 2II works through a suitable stuffing box 39. During normal operation of the turbine, when the pumps =1 and 8 are being driven thereby, the pressure of the hydraulic fluid is com-municated to the space below the piston 28 through the piping 1-2, 24, 34 valve 33, and piping 32,

an Port 3-I, and the over all pressure on the piston 28 issuch-as to hold the valve 2!! closed against the steam pressure in the supply line I9.

The valve 33 is provided with an exterior operating arm 49 which carries a weight 4| ad justably mounted thereon at its outer end. This weighted arm connects by a latch 42 pivotally mounted on the pin 43, carried by the arm 49, with a catch 44 carried by an evener bar 45. One end of the evener bar 45 is connected by a pin and slot connection 46 with the rod 41 of a piston 48 working in the bore 49 of a control cylinder 59 having an end cap 5| connected by a pipe 52 with the piping I5 and 2|, so that p ssure fluid from the lubricant system for the turbine may flow to the bore 49 to act against the piston and its return spring 52 so as to bring the piston-to a stop position defined by the shoulder 53 in the cylinder 59 and under which conditions the evener bar 45 is in a latching position. The other end of the evener bar has a pin and slot connection 54 with the rod 55 of a piston 56 operating in a bore 5'! of a cylinder 58. The cylinder 58 has an end cap 59 connected with piping 60 that connects with the piping I2, 24, so that the normal pressure of the hydraulic governor operating fluid acting upon the piston 56 will urge it to a stop position against the shoulder 6| and also compress the return spring 62 interposed between the piston and a rear end cap 63. evener bar 45 is in its position of equilibrium with the latch 42 engaging the catch 44. To facilitate this engagement the latch 42 is normally acted upon at its lower end by its leaf spring 64 and is limited in its latching movement by a stop 65. If for any reason the pressure in either the governor operating fluid supply or the lubricant supply for the main turbine 5 should drop below its normal predetermined operating pressure, then either the piston 48 or the piston 56 will under the action of its spring 52 or 82, respectively, move outwardly toward the cap 5| or 58, respectively, and thus cause an angular shifting of the evener bar 45 with its consequent release from the latch 42, so that the arm 4|] then drops through the action of the weight 4| and turns the three way valve 33 to an open position in which the pipe 34 is shut ofi and the oil under piston 28 holding the valve closed is free to drain through piping 32 and 35 to atmosphere, thus permitting the steam pressure acting on the valve 20 to immediately open the same and allow steam to flow through the supply pipe l9 to either of the turbines l1 whose throttle valve has been opened so as to start the drive of one of the pumps l6 which then continues to furnish its supply of pressure fluid for supplying the governor operating fluid and the lubricant to the main turbine until either of the pumps 1 or 8 that has gone out of commission has been repaired. r

In each instance the numeral 66 designates a valve controlling the passage or hydraulic fluid from either the piping I5, 21 or I2, 24 to waste or drain. I v

I desire it to be understood that this invention is not to be limited to any particular 'form or arrangement of parts except in so far as such limitations are included in the claims.

What I claim as my invention is: r

1. In power generating equipment having a main steam turbine and an auxiliary steam turbine, a pump for furnishing hydraulic governor operating fluid for said main turbine at a predetermined pressure, a pump for furnishing lubri- Under these conditions the cant to said main turbine at another pressure, means for driving said pumps from said main turbine, and an emergency hydraulic fluid pump driven by said auxiliary turbine, control mechanism for said auxiliary turbine comprising a valve controlling the supply of steam to said auxiliary turbine, and hydraulically controlled means dependent upon the proper supply of hydraulic fluid at said different pressures by the first and second named pumps respectively for controlling said steam valve.

2. In power generating equipment having a main steam turbine and an auxiliary steam turbine, a pump for furnishing hydraulic governor operating fluid for said main turbine at a predetermined pressure, a pump for furnishing lubricant fluid to said main turbine at another pressure, means for driving said pumps from said main turbine, and an emergency hydraulic fluid pump driven by said auxiliary turbine, control mechanism for said auxiliary turbine comprising a valve controlling the supply of steam to said auxiliary turbine, hydraulically operated means for exerting a closing pressure on said valve, and means normally equalized between the pressures of said pumps for the main turbine for relieving said closing pressure operable on the failure of either of said first named pumps to supply the main turbine with the proper amount of fluid.

3. In power generating equipment having a main steam turbine and an auxiliary steam turbine, a pump for furnishing hydraulic governor operating fluid for said main turbine, a pump for furnishing lubricant fluid to said main turbine, means for driving said pumps from said main turbine, and an emergency hydraulic fluid pump driven by said auxiliary turbine, control mechanism for said auxiliary turbine comprising a valve controlling the supply of steam to said auxiliary turbine, means operable by the hydraulic fluid from one of said pumps for holding said steam valve closed, and means for relieving the closing pressure upon said steam valve comprising a cut off and drain valve, gravity-actuated means for moving said last named valve to a drain position, latching means for normally holding said gravityactuated means in an inoperative position including an evener bar and fluid pressure operated means for each end of said bar, one of said last named means operating in response to the pressure of the governor operating fluid and the other of said last named means operating in response to the pressure of the lubricant fluid.

FREDERICK L. DORNBROOK

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