US1542162A

US1542162A - Turbine bleeder valve

Info

Publication number: US1542162A
Application number: US637778A
Authority: US
Inventors: Moore James Leonard
Original assignee: MOORE STEAM TURBINE CORP
Current assignee: MOORE STEAM TURBINE Corp
Priority date: 1923-05-09
Filing date: 1923-05-09
Publication date: 1925-06-16
Anticipated expiration: 1942-06-16

Description

June 16, 1925.

J. L. MOORE TURBINE BLEEDER VALVE Filed May 9, 192.3

2 Sheets-Sheet 1 second or a lower pressure stage. The first stage or high pressure chamber 14 is provided with an opening 141 or bleeder connection, (see Fig. 1), which is adapted to be in communication with the heating system, or other auxiliary device of the plant.

In each of said

chambers

14 and 15 are re

spectively stator members

16 and 17 and rotor members 18 and 19, said rotor mem bers 18 and 19 being fixed to a rotary shaft 20 supported in suitable fiuidtight bearings 21 within the front and rear heads of the casing 10 as is common in this class of engines and forms no part of the present invention.

The casing 10 or cylinder of the turbine at the section corresponding preferably at the upper edge of the diaphragm 13 is so "formed and constructed as to provide an opening or passageway 22 which forms a communication between the first or high pressure stage chamber 14 and the second or lower pressure stage 15. The cylinder or casing 10 and the upper edge of the diaphragm 13 are bored transversely to the longitudinal axis of the turbine in such a manner as to form jointly a circular valve seat 23 in which is disposed or arranged the rotatable bleeder valve 24. Said bleeder valve 24 is supported and carried by two stub valve stems or spindles 25 and 26, which stems rest in

bearings

27, 27, as shown, on either side of the turbine casing 10, and said valve stems 25 and 26 are so proportioned with respect to their bearings 27, and arranged with regard to the body oi the bleeder "alve that said stems or spindles 25 and 26 carry the full weight of said valve 24 and the clearance of the stems 25 and 26 in their bearin s is such that said valve 24 may be easily turned by a gover nor, not shown, and illustrated for example in U. S. Patent No. 801,322 to Kerr, dated October 10, 1905, which may be attached or linked to a lever or arm 28 on the outer end of the stem 26, as indicated in Figure 1, and common in this class of inventions and needs no further disclosure.

The main body of said bleeder valve 24 is termed with two longitudinal sections or

walls

29 and 30 which are separated to form an enclosed interior chamber 31 within the valve 24, and said chamber 81 is capable of communicating with the first or high pressure stage chamber 14 through an opening 32, and an outlet or bleeder opening or openings 38, for said interior valve chamber 31 is provided in the wall 29, as clearly shown in Figures 2 and 3, and said

walls

29 and 30 are so constructed and arranged with respect to the opening 22 and valve seat 23, so that when the valve 24 is turned into its open position, as shown in Figure 3, the two

chambers

14 and 15 on the opposite sides of the diaphragm 13 are in communication with each other through the passageway or opening 22, thereby permitting the partialh. expanded steam to pass from the first stage to the succeeding stages of expansion and to the, final exhaust opening and thence to the condenser, not shown.

lVhen the-valve 24 is adjusted in its closed position, or as shown in Figure 2, a slight leakage of steam from the chamber 14 to chamber 15 can take place through the opening 32 into the chamber 31 and interior of valve 24 and through the outlet or bleeder opening 33 to the chamber 15. By this arrangement and construction of valve 24 with respect to the

walls

29 and 30 and openings or outlets 32 and S3 to chamber 31 in relation to the valve seat 23 and

chambers

14 and 15, not only will a small quantity of steam be enabled to pass at all times through the final stages of the turbine to the condenser, when the valve 24 is in its closed position, and thereby prevents these final stages from becoming overheated, as when running dry or without expanded steam as in prior turbines provided with bleeder valves, but at the same time, due to the manner of supporting said bleeder valve 24 by the stub shafts 25 and 26, insures the easy turning and operation of the valve at all times and eliminates all danger of the bleeder valve 24 sticking or rusting to its seat during the summer months when the bleeder valve 24 is open, as shown in Figure 3, and no expanded steam is used in connection with the heating system, or for other auxiliary use or apparatus of the plant.

From the foregoing disclosure, it will be readily seen that when the valve 24 is in its closed position, as shown in Figure 2, the steam in bleeding from chambers 14 to 15 passes through the interior of the valve 24 by opening 32, inner valve chamber 31, and opening 33, and in so doing uniformly heats up the two longitudinal walls or

partitions

29 and 30 and their connected circuml'erent ial sections, in such a manner as to evenly expand or contract all the sections of the valve, and thereby prevent any distortion or warping of said valve 24-, which enables the valve to be easily turned in its seat or adjusted under all conditions and ten'iperatures. Said hollow construction of the valve 24 and

longitudinal walls

29 and 30 provides a. valve not only of unusual lightness, but at the same time of great stillness and enahlm the walls or sections 01 the valve to be made thin, thereby insuring a quick response to sudden changes of temperatures throughout the entire valve portions.

By reference to Figure 3, it will also be seen by the shape and configuration of the valve 24 and its arrangement with respect to the diaphragm 13 and seat 22 in casing 1 scares 10, avlar'ge "undiiv 'd'ed or unrestricted crosssectional area or aperture .formin'g passageway or opening 522 canlbc'opened up between lhe two chambers 1d and 15, therebyeffectmg a minimum"reduction in pressure of the steam in'lpassing from chambers 14 to 15 and hence greatly increase the efficiency oi the "turbine during the six or seven months when no steam is being bled. p

' From th'e "foregoing description of "the const guction and arrangement of pa1'ts,inode of assembling the sameand their operation, it will be seen that an the objectsand advantages recited in the statement of invention have been fu1ly,-eiiiciently and cheaply carried-out, and while the preferred lOCIn has {been shown and described, it is to be understood that many changes will sug gest themselves without in any way varying the essential features of construction or departing. from -the spirit of the invention as expressed in thejclaims.

,VVhat I claim is:- l l. A miilti-stage expansion steam turbine comprising a casing having a live steam or high pressure inlet and-final low pressure outlet, means "for effecting a plurality of stages of expansion within said casing and ,interposed between said inlet and outlet, a diaphragm within thercasmg-separating one st ge of'expansion from a succeeding stage of expansion andaprov-idedwith an opening for "the passage of th'e jsteam from one stage to the adjacent succeeding stage of expansion, an intermed iate steam pressure outlet communicating with a stage ahead of the diaphragm and receiving expanded steam and exterior of the casing, a rotary bleeder valve disposed in said opening and provided with ports' arranged and adapted to control the passage of the expanded steam through said opening from one stage to a succeeding stage or into the intermediate fluid pressure outlet, said bleeder valve provided with a chamber therein having openings or outlets communic-l ng with the exterior of said valve and. arranged and adapted to permit the steam to bleed into and through said chamber and valve when said valve is in its closed position, thereby uniformly heating all sections of said valve and permitting a small volume of expanded steam to constantly pass through the other stages of expansion between said diaphragm and final low pres sure outlet. 7

2. A multistage expansion steam turbine comprising a casing having a high pressure inlet and final low pressure outlet, means for effecting a plurality of stages of expansion within said casing and interposed between said inlet and outlet, a diaphragm Withir. the casing separating one stage of expansion from a succeeding stage of expansion and pr vided with a eecle valve seat and an valve disposed within said seat and so provided with ports, arranged and. adapted to control the passage of the expanded steam through said opening t'rom one stage to a succeeding stage or into the intermediate fluicl pres. ire outlet, said bleeder valve haw ingtwo separate longitudinal walls forming an interior chamber provided with openings or outlets communicating with the exterior of said valve and arranged and adapted to permit the steam to bleed into and through said chamber and valve when said valve is in its closed position, thereby uniformly heating all sections of said valve and permitting a small volume of expanded steam toconstantly pass through the other stages expansion "between said diaphragm and final low pressure outlet. a

3. it multistage expansion steam turbine comprising a casing having a live steam or high ,pressiu e inlet and iinal low pressure outlet, means for eflecting a plurality of es of expansion within said casing and interposed between said inletand outlet, a

diaplnta; nintho casing separating one stage of expansion from a succeeding stage oi ex-pension and provided fithanopening tortho passage ot the steam from onestage to the adjacent succeeding stage of expansion, a bleeder valve seat in the casing adjacent to said diaphragm,an intern'iediate stiani pressure outlet communicating with a sta e ahead of the diaphragm and receiving anded steam and exterior of the casing. a rotary hleeder valve disposed within said seat and provided ith ports arranged and adapted to control the passage of the expanded steam through said opening from one stage to a succeeding stage or into the intermediate fluid pressure outlet, said bleedcr valve provided with a chamber therein having openings or outlets co1nmunieating with the exterior of said valve and arranged and adapted to permit the steam to bleed into and through said chamber and valve when said valve is in its closed position, thereby uniformly heating all sections of said valve and permitting a small volume of expanded steam to constantly pass through the other stages of expansion between said diaphragm and final low pressure outlet.

4;. A multistage expansion steam turbine comprising a casing having a live steam or high pressure inlet and final low pressure outlet, means for effecting a plurality of. stages of expansion Within said casing and interposed between said inlet and outlet, a diaphragm within the casing separating one stage o't expansion from a succeeding stage of expansion and provided with an unrestricted opening for the passage of the steam from one stage to the adjacent succeeding stage of expansion, an intermediate steam pressui'e outlet communicating with a stage ahead of the diaphragm and receiving expanded steam and exterior of the casing, a hollow bleeder 'alve provided with ports arranged and adapted to unobstructedly con trol the passage of the expanded steam through said opening from one stage to a succeeding stage or into the intermediate fluid pressure outlet, said hollow bleedcr valve provided with a Chamber therein having an opening communicating with the intermediate opening in the diaphragm for the assage ot. the steam when said bleeder valve is in its open position, whereby said steam is capable of passing into the interior of said valve and uniformly heat the inner portion or unexposed sections of the valve by said steam passing from one stage to a succeeding stage. 4

5. A multi-stage expansion steam turbine comprising a casing provid d with a bleeder valve seat and having a high pressure inlet and final low pressure outlet, a plurality of expansion chambers within said casing and interposed between said inlet and outlet, an intermediate steam pressure outlet communi eating with a stage ahead of the diaphragm and receiving expanded steam and exterior of the casing, a bleeder valve provided with ports arranged and adapted to control the passage of the expanded steam from one stage to a succeeding stage or into the intermediate fluid pressure outlet, said bleeder 'alve provided with a chamber therein having openings or outlets comn'nmicating with the exterior of said valve and arranged and adapted to permit the steam to bleed into and through said chamber and valve when said valve is in its closed position, thereby uniformly heating all sections of said valve and permitting a small volume of expanded steam to constantly pass through the other stages of expansion between said diaphragm and final low pressure outlet.

A multi-stage expansion steam turbine rotary bleeding valve provided with a ch a1n ber therein having openings or outlets communicating with the exterior of said valve and arranged and adapted to permit steam to bleed into or through said chamber and 'alve, thereby enabling said steam to uniformly heat all sections of said valve in the open or closed position of said valve.

7. A multi-stage expansion steam turbine hollow rotary bleeding valve formed with two separated longitudinal walls provided with openings or outlets, communicating with the exterior of said valve and arranged to lighten and at the same time stillen the valve structure and also permit steam to bleed into or through said hollow valve to thereby enable said steam to uniformly heat all sections of said valve in the open or closed position of said valve.

In testimony whereof I afiix my signature.

JAMES LEONARD MOORE.