GB949031A - Improvements in the pitch control of variable pitch vanes in axial flow compressors - Google Patents
Improvements in the pitch control of variable pitch vanes in axial flow compressorsInfo
- Publication number
- GB949031A GB949031A GB5497/59A GB549759A GB949031A GB 949031 A GB949031 A GB 949031A GB 5497/59 A GB5497/59 A GB 5497/59A GB 549759 A GB549759 A GB 549759A GB 949031 A GB949031 A GB 949031A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- cam
- lever
- spring
- controlled
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
- F04D27/0246—Surge control by varying geometry within the pumps, e.g. by adjusting vanes
Abstract
949,031. Fluid-pressure servomotor systems. DOWTY FUEL SYSTEMS Ltd. May 17,1960 [Feb.17, 1959], No. 5497/59. Heading G3P. [Also in Division F1] A control system for variable pitch vanes 66 of the compressor of a gas turbine includes means responsive both to compressor speed N and compressor inlet temperature T 1 to control the vanes in accordance with either of the expressions N<SP>1</SP>/T 1 or N<SP>2</SP> - f(T 1 ), a stop 80 being provided to prevent the means responding to increase in T 1 above a predetermined value but to permit response to variations in the compressor speed N. A radial cylinder fuel pump 1 has its displacement adjusted by a track ring 2 of variable eccentricity connected to a servo piston 3 controlled by a restrictor 27 and a half ball valve 24 on a lever 21 pivoted at 22. The position of the lever and hence of the vlave 24 is controlled by the pressure drops in a valve-controlled part 8 in the fuel supply line 6, 12 to the engine and by a cam 49 whose angular position corresponds to engine speed, the cam acting on the lever through an adjustable spring 31 co-operating with a pre-set spring 29. A second servo piston 32 controlled by a restrictor 35 and a half ball valve 37 on a lever 39 actuated by compressor output pressure operates a valve 11 in the bore 8, the valve being connected to the lever by a feed back spring 44 cooperating with a pre-set spring 45. To position the vanes 66 in response to engine speed a cam 48 mounted together with the cam 49 on a shaft 47 controls a pilot valve 61 for a jack 65, the pilot valve being connected to the fuel supply line 6 through a pressure-regulating valve 84. The cam controls the valve through a lever 56 having its fulcrum 78 connected to the jack 65 by a feedback linkage including a cam 73 rotated by a plunger 79 and a bellows 87 in response to compressor inlet temperature, the movement of the cam being limited by the stop 80 while continued expansion of the bellows is accommodated by a spring-loaded stop 83. A roller 72 actuated by the jack 65 through a linkage 67... 69 is interposed between the cam 73 and a plunger 74 connected by cranks 75, 77 and a shaft 76 to the fulcrum 78. The shaft 47 carrying the cams 48, 49 is rotated through a rack and pinion 96, 97 by a servo piston 94 controlled in the same way as the other servo pistons, the half ball valve 92 being adjusted by centrifugal flyweights 88 through a plunger 89 and a lever 91. The pinion 97 also meshes with rack teeth on a plunger 98 carrying a spring 99 to form a feedback connection while the flyweights include auxiliary weights so that the centrifugal force produced is independent of fuel density. A by-pass valve 101 connected to a servo piston 105 controlled by an all-speed governor on a minimum flow control regulates the fuel flow during deceleration on constant-speed operation. In Fig. 2, a speed sensing device 121 adjusts a valve 124 governing the flow through a restrictor 127 and hence the position of a piston 125 which operates a cam 131 and compresses a spring 132 opposing the movement of the valve 124. The cam 131 controls the guide vane jack 139 through a valve 137 and a floating lever 134 whose fulcrum is controlled both by a feedback movement through a cable 143 connected with the vanes 141 and by a bellows 149 responding to compressor inlet temperature. A second bellows 152 prevents fulcrum adjustment due to ambient temperature changes while a stop 154 limits the inlet temperature response, a spring 155 absorbing further movement of the bellows. According to the Provisional Specification, the cable 143 may be connected to a roller unit interposed between a link 146 and a member adjusted angularly by the bellows 149.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5497/59A GB949031A (en) | 1959-02-17 | 1959-02-17 | Improvements in the pitch control of variable pitch vanes in axial flow compressors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5497/59A GB949031A (en) | 1959-02-17 | 1959-02-17 | Improvements in the pitch control of variable pitch vanes in axial flow compressors |
Publications (1)
Publication Number | Publication Date |
---|---|
GB949031A true GB949031A (en) | 1964-02-12 |
Family
ID=9797321
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5497/59A Expired GB949031A (en) | 1959-02-17 | 1959-02-17 | Improvements in the pitch control of variable pitch vanes in axial flow compressors |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB949031A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2304781A1 (en) * | 1975-03-18 | 1976-10-15 | United Technologies Corp | GAS TURBINE FUEL CONTROL |
US10208758B2 (en) | 2015-11-12 | 2019-02-19 | Industrial Technology Research Institute | Internal hot gas bypass device coupled with inlet guide vane for centrifugal compressor |
CN109790700A (en) * | 2017-09-13 | 2019-05-21 | 日立建机株式会社 | Work machine |
-
1959
- 1959-02-17 GB GB5497/59A patent/GB949031A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2304781A1 (en) * | 1975-03-18 | 1976-10-15 | United Technologies Corp | GAS TURBINE FUEL CONTROL |
US10208758B2 (en) | 2015-11-12 | 2019-02-19 | Industrial Technology Research Institute | Internal hot gas bypass device coupled with inlet guide vane for centrifugal compressor |
CN109790700A (en) * | 2017-09-13 | 2019-05-21 | 日立建机株式会社 | Work machine |
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