US1601737A

US1601737A - Bleeder turbine

Info

Publication number: US1601737A
Authority: US
Inventors: Josiah F Johnson
Original assignee: Westinghouse Electric and Manufacturing Co
Current assignee: CBS Corp
Priority date: 1923-04-02
Filing date: 1923-04-02
Publication date: 1926-10-05
Anticipated expiration: 1943-10-05

Description

Patented Oct. 5, 1926.

' reins JOHNSON, OF SWARTI-IMORE, PENNSYLVANIA, ASSIGNOR TO ESTING- J'OSIAI-I F.

HOUSE EL SYLVAN Application filed April 2, 1923.

ECTBIC AND MANUFACTURING COMPANY, A CORPORATION OF PENN- BLEEDER TURBINE.

My invention relates to bleeder turbines to provide, in con and it has inter-stage val :5 tractile type, whereby a and economical valve operation may secured.

Apparatus invention is i drawings,

tion, in which, Fig.

of a bleeder Inter-stage valve employed in f this character, an

nsible and conte passage area made in accordance with my llustrated on the accompanymg forming a par 1 is a sec showing my impr lied thereto; and

taken along the line turbine t of this applica tional view oved Fig.

mechanism is ordinarily connection with bleeder tur connection is made bines where the bleeder with the turbine between the high and lowpressure sections such valve m the flow of section to the low-pressure uniform a bleeder pressure tained as po steam ssible with and in bleeder demand. invention 15 to provide valve mechanism of this type so cating area between sure sections which is economical construction vention, I show ing or cylinder the energy-abstr pressure section,

sure section,

hi h-pressure section 12 ve l ocity impulse st steam from charges steam t ing 16. A bleed cates with the turbin high-pressure section the low-pressur means, at 18, sure section as to and to and prov from the standpoint of operation.

accompanying draw-- thereof, the purpose of echanismbeing to so control from the high-pressure section that as may be main variations in load The object of afford ample communithe hlgh and low-preside a constructlon sof comprises a multiage 14, which receives the inlet 15. and which dise section 13.

o the stages of reaction blader connection 17 communr e casing between the 12 of the turbine and Separating is shown between the low-pres 1.3 and the bleeder connec time 17 and the high-pressure section 12, i said separating means including valve mechanism, which is thesubject of my improvement and which willnow be described. v

The separating means, at 18, includes an annular member 19, which issecured to the turbine casing 10 and which is provided with a hub portion 20 of channel-like formation. The'outer' side 21 of the hub portion 20 is provided with a valve seat 22, having ports or passages 28 therein and the inner por tion 2 1 of the hub portion is provided with packing 25 ofvany suitable type cooperating with the rotor 11 to prevent as far as possible the passage of steam to the low-pres sure section 13 other than through the ports 28.

A contractile and eXpansible valve member 27 cooperates with the seat 22 to cover and uncover the ports 28. Lateral guides 28 and 29, preferably carried by the hub portion 20, co-operate with the expansible and contractile valve member to prevent lateral displacement thereof. A r retaining member 30 is carried by the casing, 10 and it is provided with inwardly-projecting ribs or bosses 31, which serve to limit outward or expansive movement of the contractile and expansible valve member.

The contractile and expansible valve member is preferably made of flexible material, as illustrated inFigs. 1 and 2; however, it

i will be obvious that the expansible and contractile member maybe made up of a plurality of sections hinged together so as to provide for the expansible and contractile movements' The valve member 27 in Fig. is provided with an intermediate hinge in order to permit of more ready expanding and contracting movements.

The expansible and contractile valve member has one end anchored to the wall mem ber 21 and thefother end of such valve-member is connected to a link 33 operated by any suitable reciprocatory mechanism to secure expanding and contracting movements of the member. The anchoring means for one end of the valve member preferably comprises a link 34, pivotally connected at to one end of the valve member 27 and having its other end pivotally connected at 36 at the bottom of an outwardly-flaring depression 37 provided in the outer wall 21 of the hub portion 20. This pivoted link construction for anchoring one end of the valve member 27 permits of inward and outward movements of that end so that it may be brought in contact with the valve seat and moved away therefrom to fully expose the ports 23. The link 33 is pivotally connected at 38 to the other end of the valve member 27 in order to permit of the necessary inward and outward movements thereof. From the structure described, it will be apparent that the expansible and contractile valve member 27-may be moved in wardy and outwardly substantially uniformly throughout its extent in order to control the passage of steam to the lowpressure section 13.

While I have illustrated a contractile and expansible valve member 27 which extends nearly around the hub portion 20, it is to be understood that any desired. extent of the valve member may be used so long as the ends are spaced apart less than 180, so that the operating forces present may be utilized to secure controlling movement thereof. Insofar as my invention is con cerned, therefore, the valve seat may take the form of any suitable curve or combination of curves of finite radius.

Turning now to the reciprocatory mechanism for obtaining expanding and contracting movement of the valve member 27 in Fig. 2, I show a relay, at 40, which includes an operating piston 41, arranged in the operating cylinder 42 and connected to the link 33. A pilot valve 43 serves to control the admission and exhaust of motive fluid to the operating cylinder to secure reciprocatory movements of the piston 41 and expansible and contractile movement of the valve mem ber 27 The

stems

44 and 45 of the operating piston and of the pilot valve are pivotally connected to a floating lever 46 and one end of the latter is pivotally connected to a link 47 carried by the diaphragm 48 of the pressure-responsive device 49, which has a' conduit 50 connected to the bleeder line 51, the latter being connected to the bleeder outlet l7. In order to adjust the desired bleeder pressure an adjustable weight 52 is carrier by the floating lever 46 so that the force effective above the diaphragm 48 may be varied, thereby securing a variation in the steam pressure effective below the diaphragm through the necessary operation of the valve member 27. I

From the foregoing, the operation of apparatus made in accordance with my invention will'be apparent. The contractile and expansible valve member is moved inwardly and outwardly to vary the passage of motive fluid to the lowpressure section 13 in order to maintain a substantially constant bleeder pressure with variations in turbine load and in bleeder line requirements. The necessary movement of the valve member to secure this result is effected by means of a pressure-responsive device 49 associated with the bleeder conduit 51 and which acts through the relay 40 to apply reciprocatory movements to one end of the valve'member 27. Vith a reduction in bleeder line pressure, the link 47 and the diaphragm 48 would move downwardly, with the result that the pilot valve 45 would move down wardly and motive fluid would be admitted below the operating piston 41 to move the latter upwardly in order to contract the valve member 27and to restrict the flow of motive fluid to the low-pressure section 13 which result in a tendency to build up pres sure, whereby the bleeder line pressure may bemaintained with an increase in bleeder demand or with a decrease in the power requirements of the turbine. On the other hand, with an increase in bleeder pressure, incident to an increase in power requirements or to a decrease in bleeder demand, the pressure-responsive device 49 operates through the relay 40 to move the link 33 downwardly with the result that the valve member 27 is moved outwardly from its seat 22, thereby affording a freer passage for motive fluid to the low-pressure section 13, and consequently limiting the attainable pressure in the conduit 51. a

If, at any time, it should be desir d to change the bleeder pressure, this may be done by adjusting the weight 52. [mincrease in weight means a greater force to be overcome by the steam pressure from the conduit 51, with the result that a higher pressure may be maintained in the latter,- while a decrease in the weight 52 results in adecrease in the bleeder pressure to be maintained. 7

While I have shown my invention in but one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various other changes and modifications without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed there upon as are specifically set forth in the appended claims.

What I claim is:

1. In a bleeder turbine having a highpressure section and a low-pressure section a dividing member between the sections, a port in the dividing member for affording communication between the sections, and a contractile and expansible member for openingand closing the port.

2. In a bleeder turbine having a highpressure section and a low-pressure section, a

dividing member between the sections, a plurality otp'orts in the dividing member for affording communication between the sections, and a contractile and expansible member for opening and closing the ports 3. In a bleeder turbine having a high pressure section and a low-pressure section, a dividing aember between the sections, a plurality of ports in the dividing member for atlording communication between the sec tions, a contractile and expansible member for opening and closing the ports, and pressure-responsive means for contracting and expanding said member.

l. In a bleeder turbine having a highpressure section, a low-pressure section and a bleeder connection between the sections, a member for separating thesections located between the bleeder connection and the lowpressure section and having a plurality of ports to afford communication between the sections, a contractile and expansible mem-,

ber for opening and closing the ports, and means responsive to the pressure in the bleeder connection for contracting and expanding said member.

5. In a bleeder turbine having a highpressnre section and a low-pressure section, a member for separating the sections having a valve seat portion provided with a plurality of ports, a contractile and expansible valve member cooperating with said ports, and guides for said valve member.

6. In a bleeder turbine having a highpressure section and a low-pressure section,

member for separating the sections having a hub portion defining a valveseat with a plurality of ports, a contractile and expansible valve member cooperating with said ports, lateral guides for the valve member, and means for limiting expansible movement of the valve member.

'i'. In a bleeder turbine having a rotor having a high-pressure section and a low-pressure section, a member for separating the sections having a hub portion defining a valve seat with a plurality of ports therein and having an inner packingport-ion for cooperation with the rotor, a contractile and expansible valve member cooperating with the valve seat, means for guiding the valve member, and means for limiting the expansible movement of the valve member.-

8. In a bleeder turbine having a highpressure section and a low-pressure section,

a member for separating the sections having a circumferentially-extending valve seat with ports therein, a flexible valve member cooperating withcthe seat, and means for expanding and contracting the flexible valve member.

9. In a bleeder turbine having a highpressure section and a low-pressure section, an annular member for separating the sections and having a ported valve seat por tion curved 'circumferentially with respect to the turbine axis',-and a'flexible valve member cooperating'with' said ported valve seat portion and surrounding the latter.

10.'In a bleeder turbine having a high- 'a member t'or separating the sections and having a curved valve seat portion with a plurality of ports therein, a flexible valve member for opening and closing the ports, and means responsive to pressure in the bleeder connection for operating the flexible valve member.

11. In a bleeder turbine having a highpressure section and a low-pressure section. a member for separating the sections an having a hub portion provided with ports therein for affording communication between the high-pressure section and the lowpressure section, an expansible and contractile valve member for opening and closing the ports, means for anchoring one end of the contractile and expansible member to said hubportion comprising a link pivotally connected to one end of said member and pivotally connected to said hub portion within the normal exterior surface thereof, and reciprocatory mechanism connected to the other end of the contractile and expansible member.

12. In a bleeder turbine having a highpressure section and a low-pressure section, a member for separating the sections and having a hub portion provided with a plurality of ports and with a pocket or depression, an expansible and contractile member for covering and uncovering the ports,a link pivotally connected to one end of said expansible'and contractile member and pivotaliy connected to said hub portion within thepocket or depression thereof, andireciprocatory mechanism connected to the other end of the expansible and contractile member.

13. In a bleeder turbine having a highpressure section and a low-pressure section, a member for separating the sections and having a hub portion provided with a plurality of ports and an outwardly-flaring pocket or depression, a flexible member for covering and uncovering the ports, a link pivotally connected to one end of the flexible member and pivotally connected to said hub portion at the bottom of the pocket or depression, and reciprocatory mechanism connected to the other end of the flexible member.

14. In a bleeder turbine having a highpressure section, a low-pressure section and a bleeder connection between the sections, a member for separating the sections locat ed between the bleeder connection and the low-pressure section and having a hub portion provided with a plurality of ports and an outwardly-flaring pocket or depression, a flexible member for covering and uncovering the ports, anchoring means for one end of the flexible member and which is pivotally connected to said hub portion at the bottom of the pocket or depression, reciprocatory mechanism connected to the other end of the flexible member, and pressureresponsive means connected to the bleeder connection to control the operation of said 10 reciprocatory mechanism.

In testimony whereof, I have hereunto subscribed my name this 16th day of March 1923.

JOSIAH F. JOHNSON.