US3536089A - Electric to fluid pressure transducer - Google Patents

Electric to fluid pressure transducer Download PDF

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Publication number
US3536089A
US3536089A US638968A US3536089DA US3536089A US 3536089 A US3536089 A US 3536089A US 638968 A US638968 A US 638968A US 3536089D A US3536089D A US 3536089DA US 3536089 A US3536089 A US 3536089A
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US
United States
Prior art keywords
chamber
supply
transducer
valve
fluid pressure
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 - Lifetime
Application number
US638968A
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English (en)
Inventor
Ronald A Sarbach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Westinghouse Air Brake Co
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Westinghouse Air Brake Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Westinghouse Air Brake Co filed Critical Westinghouse Air Brake Co
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Publication of US3536089A publication Critical patent/US3536089A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K24/00—Devices, e.g. valves, for venting or aerating enclosures
    • F16K24/04—Devices, e.g. valves, for venting or aerating enclosures for venting only
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2574—Bypass or relief controlled by main line fluid condition
    • Y10T137/2605—Pressure responsive
    • Y10T137/2607—With pressure reducing inlet valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86919—Sequentially closing and opening alternately seating flow controllers

Definitions

  • ABSTRACT An electric to fluid pressure transducer compris- [51] Int. Cl. B60t 15/06 ing a self-lapping valve means actuatively controlled by an [50] Field of Search 137/ 1 16.3, electric torque motor to deliver a supply of fluid at a pressure 627.5, 596.2, 85, 596.18; 91/429; 303/52, 54; in accordance with the degree of electrical energization of the 137/116.5; 137/495; 73(Prince) torque motor.
  • transducer which is operable with a minimum of hysteresis effect for both increasing and decreasing delivered fluid pressures, and operable with a minimum frictional force at all times and more especially at time of reversing a control fluid pressure by means of reversing the increments of electrical energy supplied to the transducer. It is also desirable to provide a fluid pressure transducer in which the electric portion operates against a uniform low force load thus minimizing the size of the electric control unit and also minimizing the frictional characteristics of said transducer thus enabling a control in small increments in which the hysteresis effect and frictional effect is held to a minimum when changing from an increasing to a decreasing fluid pressure control and vice versa.
  • This invention relates to a transducer for providing a pneumatic analog supply of fluid pressure responsive to variations in electrical energy supplied thereto, said analog pressure being directly proportional to the voltage impressed upon the transducer.
  • a cam positioned by an electric rotary torque motor actuates a self-lapping valve device within the transducer to supply fluid at a pressure in accordance with the positioning of the cam with a minimum of hysteresis or frictional effects.
  • FIG. 1 is a sectionalized view of the transducer shown with a zero electrical energy input and consequent zero fluid pressure delivered by said transducer.
  • FIG. 2 is a fragmental sectionalized view of the control portion portion of the transducer showing the condition for a maximum of electrical energy input to the transducer and consequent maximum pressure output.
  • FlG. 3 is a fragmental sectionalized view of the transducer showing the drive connection of the torque motor to the cam.
  • the transducer comprises a valve body 1 having three portions, a supply portion 2, a delivery portion 3, and a control portion 4, held together by a suitable conventional securing means (not shown).
  • a cam 6 rotation of which is controlled by an external torque motor 7,(FIG. 3)through a shaft 8 extending through the wall of portion 4.
  • the cam 6 rides against a cam follower 9 in engagement with an antifriction bearing 10.
  • the follower 9 has a hollow stem 11 extending through a wall of the delivery portion 3 with suitable sealing means, into a chamber 12 in said delivery portion of the body 1.
  • the follower 9 is biased downward against the cam 6 by a spring 13 compressed between the aforesaid wall of the delivery portion 3 and a flange 14 on the stem.
  • a chamber 15 in the hollow stem 11 is connected by a port 16 to a chamber 17 in the control portion of the body which in turn is connected by a passage 18 to atmosphere.
  • One end (the upper end as shown in the drawing)of the chamber 15 is open, while the other end is closed.
  • a diaphragm piston 19 comprising a diaphragm 20 and a hollow piston stem 21 secured thereto and extending through a wall in the supply portion 2 with suitable sealing means into a supply chamber 22 connected by passage 23 to a suitable source of supply of fluid under pressure (not shown herein).
  • the diaphragm piston 19 is maintained in position by a spring 24 enclosed in a vent chamber 25 and abutting the aforesaid wall in the supply portion 2 and the diaphragm 20.
  • the hollow piston stem 21 extends from the chamber 22 and chamber 25 down through the diaphragm 20 to a supply valve 26 secured to the diaphragm 20 on the opposite (under) side thereof.
  • Supply valve 26 comprises a hollow piston means having a chamber 27 in which is enclosed a spring 28 and valve 29, said valve 29 being biased by said spring 28 to a valve seat 30 within said chamber 27.
  • the supply valve 26 is slidably movable through a wall 31 within the delivery portion of the valve body.
  • a control chamber 32 is defined between the wall 31 and the diaphragm 20, within the supply portion 2, said chamber 32 being connected by a choke means 33 to the chamber 12, said chamber 12 being connected by passage 34 to the desired control means to be controlled by the fluid pressureoutput from said transducer.
  • the torque motor 7 as shown in FIG. 3 is of the conventional type torque motor designed for high torque stand still operation, for positioning systems whereby the torque supplied directly to the shaft 8 is proportional to the voltage supplied by the leads 35 and 36. By the elimination of gears there is no backlash error with this directly coupled shaft 8 and cam 6.
  • the transducer With no torque applied to the cam, the transducer is positioned such that the valve 29 is against the valve seat 30 thereby shutting off supply of fluid from the supply chamber 20 to the chamber 12 and the hollow stem 11 is slightly removed from said valve 29 to permit venting of chamber 12 around the open end of said hollow stem 11 through the chamber 15 and port 16 to chamber 17 and the atmospheric vent 18.
  • the hollow stem 11 With the initial turning of the cam responsive to a slight. voltage on the torque motor the hollow stem 11 is moved upward as shown in the drawing whereby the open end of the hollow stem engages the valve 29 to cut off exhaust of chamber 12 through said hollow stem as just described.
  • control chamber 32 acts upon the diaphragm 20 until the spring24 is compressed to permit the diaphragm piston 19 to move to a position to permit the valve seat 30 to move against the valve 29 to stop the supply of fluid under pressure to chamber 12 and thereby define a lap condition of the transducer. Further increasing voltage supplied to the torque motor will cause further rotation of the cam 6 to again cause the hollow stem 11 to effect movement of the valve 29 away from the seat 30 to again supply fluid under premure to the chamber 12 until the simultaneous build-up of fluid pressure in the control chamber 32 again causes a lap condition of the transducer as just described.
  • the fluid pressure in the control chamber 32 is simultaneously vented through the choke 33 to chamber 12 to cause the diaphragm piston 19 to move downward to permit the valve 29 to again seat on the open end of the hollow stem 1 1 and thereby define a lap condition of the transducer during a voltage and pressure reduction.
  • Continued reduction of the voltage supply to the torque motor will effect further downward motion of the cam follower 9 and the hollow stem 11 to permit further reduction of the fluid pressure from the operating unit, chamber 12, and control chamber 32 until complete venting is accomplished to render the operating unit completely vented as initially described.
  • self-lapping valve means in said casing having an operating stem the axial position of which determines the fluid pressure output of the valve means, said self-lapping valve means including:
  • a first annular valve seat to which said disc valve element is biased in seated relation to close communication between a fluid pressure inlet and a fluid pressure outlet which communication is opened upon unseating of said disc valve element from said first valve seat;
  • a second annular valve seat formed on the said operating stern and engageable with said disc valve element coaxially within said first annular valve seat to close an exhaust communication from said outlet to atmosphere which exhaust communication is opened upon unseating of said second annular valve seat from said disc valve element;
  • said operating stem being effective to shift said second annular valve seat into and out of seated relation with said disc valve element, and to shift said disc valve element with respect to said first annular valve seat;
  • cam means in said casting for controlling the axial position of the operating stem
  • a torque motor secured to said casing for variously positioning said cam means according to the degree of electrical input to said torque motor.
  • An electric to fluid pressure transducer comprising:
  • a. a casing including:
  • a third chamber communicating with said second chamber via a restricted orifice in a wall therebetween;
  • a fourth chamber and a fifth chamber each constantly open to atmosphere
  • a self-lapping valve means including:
  • a stern member coaxially extending through said diaphragm and sealingly fixed thereto, one portion of said stem member at one side of said diaphragm extending slidably throu' an opening in said wall between said second an tlurd chambers and terminating in said second chamber, the opposite end portion of said stem member extending in slidably sealed relation through an opening in a wall between said fourth and said first chambers and terminating in said first chamber, said stem member having a passage therein open to said first chamber, and having a first annular valve seat in the said passage;
  • a second annular valve seat formed at one end of said operating stem and coaxially disposed within said first annular valve seat for seated and unseated relation with said valve member;
  • the said operating stem extending in slidably sealed relation through a wall of the casing separating said second and said fifth chambers and having a passage opening within said second annular valve seat and also constantly open to said fifth chamber;
  • a cam means being operating to shift said operating stem to a position in which it causes seating of said second annular valve seat on said valve member to close communication between said second and said fifth chambers and unseating of the valve member from said first annular valve seat to effect supply of fluid under pressure from said first chamber to said second chambenthe pressure of fluid supplied from said second chamber to said third chamber via said restricted orifice being effective on said diaphragm to cause said first annular valve seat to be moved correspondingly to effect reseating of the valve member thereon to lap off further supply of fluid under pressure from said first to said second chamber; and
  • a torque motor secured to said casing for variously positioning said cam means according to the degree of electrical input to said torque motor.
US638968A 1967-05-16 1967-05-16 Electric to fluid pressure transducer Expired - Lifetime US3536089A (en)

Applications Claiming Priority (1)

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US63896867A 1967-05-16 1967-05-16

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DE (1) DE1650602B2 (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3724912A (en) * 1972-01-25 1973-04-03 Westinghouse Air Brake Co Apparatus for regulating brake control pressure
US3796135A (en) * 1970-01-08 1974-03-12 Gachot Jean Pneumatic control device with programmed characteristic, particularly for a vehicle braking device
US4052996A (en) * 1976-05-24 1977-10-11 Combustion Engineering, Inc. Fluid pressure relay
JPS5317825U (de) * 1976-07-23 1978-02-15
JPS5320131A (en) * 1976-08-09 1978-02-24 Aisin Seiki Vacuum cut off valve device
US4151856A (en) * 1977-10-11 1979-05-01 Combustion Engineering, Inc. Fluid pressure relay and output booster
US4365644A (en) * 1979-04-26 1982-12-28 Centro Ricerche Fiat S.P.A. Automatic timer valve for controlling the output of irrigation plant
US4649803A (en) * 1984-08-15 1987-03-17 The Garrett Corporation Servo system method and apparatus, servo valve apparatus therefor and method of making same
US20070186978A1 (en) * 2006-02-15 2007-08-16 Yu-Cheng Lin Portable tire pump
US20170130693A1 (en) * 2015-11-10 2017-05-11 Poclain Hydraulics Industrie Distribution device for a hydraulic machine and a hydraulic machine fitted with such a device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5685553A (en) * 1979-12-17 1981-07-11 Aisin Seiki Co Ltd Fluid pressure responsive controlling valve apparatus

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3796135A (en) * 1970-01-08 1974-03-12 Gachot Jean Pneumatic control device with programmed characteristic, particularly for a vehicle braking device
US3724912A (en) * 1972-01-25 1973-04-03 Westinghouse Air Brake Co Apparatus for regulating brake control pressure
US4052996A (en) * 1976-05-24 1977-10-11 Combustion Engineering, Inc. Fluid pressure relay
JPS5317825U (de) * 1976-07-23 1978-02-15
JPS5320131A (en) * 1976-08-09 1978-02-24 Aisin Seiki Vacuum cut off valve device
JPS5929886B2 (ja) * 1976-08-09 1984-07-24 アイシン精機株式会社 バキュ−ムコントロ−ルバルブ装置
US4151856A (en) * 1977-10-11 1979-05-01 Combustion Engineering, Inc. Fluid pressure relay and output booster
US4365644A (en) * 1979-04-26 1982-12-28 Centro Ricerche Fiat S.P.A. Automatic timer valve for controlling the output of irrigation plant
US4649803A (en) * 1984-08-15 1987-03-17 The Garrett Corporation Servo system method and apparatus, servo valve apparatus therefor and method of making same
US20070186978A1 (en) * 2006-02-15 2007-08-16 Yu-Cheng Lin Portable tire pump
US20170130693A1 (en) * 2015-11-10 2017-05-11 Poclain Hydraulics Industrie Distribution device for a hydraulic machine and a hydraulic machine fitted with such a device
US10690109B2 (en) * 2015-11-10 2020-06-23 Poclain Hydraulics Industrie Distribution device for a hydraulic machine and a hydraulic machine fitted with such a device

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Publication number Publication date
DE1650602B2 (de) 1978-06-01
DE1650602A1 (de) 1970-11-05

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