US3680586A - Differential servo-limiter - Google Patents

Differential servo-limiter Download PDF

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Publication number
US3680586A
US3680586A US3680586DA US3680586A US 3680586 A US3680586 A US 3680586A US 3680586D A US3680586D A US 3680586DA US 3680586 A US3680586 A US 3680586A
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US
United States
Prior art keywords
throttle valve
pressure
limiter
solenoid
electromagnet
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
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English (en)
Inventor
Jacques Bourgeois
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.)
SERAM SARL
Original Assignee
SERAM SARL
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 SERAM SARL filed Critical SERAM SARL
Application granted granted Critical
Publication of US3680586A publication Critical patent/US3680586A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0644—One-way valve
    • F16K31/0668—Sliding valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0644—One-way valve
    • F16K31/0648—One-way valve the armature and the valve member forming one element
    • 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
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7781—With separate connected fluid reactor surface
    • Y10T137/7784—Responsive to change in rate of fluid flow
    • Y10T137/7787—Expansible chamber subject to differential pressures
    • Y10T137/7788—Pressures across fixed choke

Definitions

  • a differential servo-limiter for regulating flow in hydraulic circuit employs an electromagnet which acts when energized on the same side of a throttle as restricted pressure from the inlet to the differential servo-limiter to balance the pressure difference acting on the other side of the throttle valve constituting unrestricted inlet pressure, the residual flow going to the outlet being at all times dependent on the intensity only of the current to the solenoid coil.
  • hydraulic pressure reducers are known which are apparatus wherein the residual pressure obtained from an upstream pressure P is dependent on the calibration of a spring.
  • the object of the invention is to obtain a specific flow rate in a hydraulic circuit in a simpler and less expensive manner with at least as much precision as by the combination discussed hereinbefore, and by means of a single apparatus.
  • the invention provides an apparatus which will be referred to hereinafter as a differential servo-limiter, which is characterized in that it comprises in combination essentially:
  • a first portion provided with a central chamber containing a mobile throttle valve
  • a second portion mounted in sealing-tight manner on the first, consisting chiefly in a solenoid provided with a central cavity in which there is adapted to move a plunger core acting through the agency of a push rod on the valve of the first portion,
  • a first hydraulic circuit putting the supply on the one hand into direct and permanent communication with a first side of the central chamber of the first portion in which the valve moves, on the other hand into permanent communication through the agency of a calibrated orifice both with the second side of the central chamber of the first portion in which the valve moves and with the central cavity of the second portion in which the plunger core of the solenoid moves,
  • a second hydraulic circuit establishing communication between the user and the second side of the central chamber of the first portion, depending on the position of the throttle valve in the said chamber, the said valve creating a pressure loss which, from one position of equilibrium to the other, varies as the difi'erence in pressures between the supply and the user varies.
  • a fluid under pressure P is introduced through the supply orifice la or 1b selectively.
  • a solenoid 8 comprising in addition to the magnetic circuit a coil 9 which is supplied with current through a terminal 10 and a plunger core 11 which moves in a central cavity 16 of which it has substantially the same cross-section and acting on the valve 3 by means of a push rod 12 made of a non-magnetic material.
  • the solenoid 8 is itself mounted in sealing-tight manner by means of a sealing ring 15 on a base 14 made of a magnetic material, closing the magnetic circuit of the solenoid, and in this base there is formed a central passage 13 for a push rod 12.
  • a calibrated orifice 24 introducing a pressure loss p into the fluid flow towards the second side of the central chamber 2, in which the valve moves.
  • the fluid after passing through the calibrated orifice 24, the ducts 17, 14 and the winding of the solenoid 9, is introduced on the one hand at the summit of the plunger core 11 into the central cavity 16 and on the other hand at the other end of the plunger core into the same cavity, for example, passing through a bore, a groove or any other communication formed in or on the plunger core and illustrated in the drawing in the form of broken lines 21.
  • the apparatus operates as follows:
  • the pressure drop Ap varies as the difierence in the pressures P P, varies, whilst the pressure drop p created by the calibrated orifice 24 remains constant and proportional to the force F exerted on the valve by the solenoid as is shown in the equation (1), that is to say proportional to the intensity i applied to the said solenoid.
  • the flow rate of the fluid through the calibrated orifice 24, which is solely dependent on the value of p, is solely dependent on the intensity applied to the solenoid and, by the differential servo-limiter according to the present invention the flow rate of a hydraulic circuit is optionally regulated in accordance with the intensity applied to the solenoid.
  • first and second parts coupled together in a sealing type manner, said first part including a central chamber containing a slidable throttle valve sealably carried therein, and said second part com prising means, mounted in a sealing type manner on said first part, for actuating said throttle valve, openings in said first part for delivering without fluid restriction, the inlet pressure of the hydraulic circuit to one side of the throttle valve, calibrated means for delivering a restricted fluid pressure to the other side of said throttle valve fromsaid inlet, 1
  • said means for actuating said throttle valve comprises an electromagnet acting, when energized, in conjunction with said restricted fluid pressure on the same side of said throttle valve and balancing the unrestricted fluid pressure acting on the other side of the throttle valve; whereby, the residual flow passing to the outlet at all times is dependent upon the intensity of the current applied core to said throttle valve and being provided on the other hand with a lateral bore providing passage for restricted fluid pressure between said first and second parts.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Magnetically Actuated Valves (AREA)
  • Flow Control (AREA)
US3680586D 1969-10-22 1970-10-22 Differential servo-limiter Expired - Lifetime US3680586A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6936153A FR2063990A1 (enrdf_load_stackoverflow) 1969-10-22 1969-10-22

Publications (1)

Publication Number Publication Date
US3680586A true US3680586A (en) 1972-08-01

Family

ID=9041877

Family Applications (1)

Application Number Title Priority Date Filing Date
US3680586D Expired - Lifetime US3680586A (en) 1969-10-22 1970-10-22 Differential servo-limiter

Country Status (5)

Country Link
US (1) US3680586A (enrdf_load_stackoverflow)
DE (1) DE2049068B2 (enrdf_load_stackoverflow)
FR (1) FR2063990A1 (enrdf_load_stackoverflow)
GB (1) GB1314256A (enrdf_load_stackoverflow)
IT (1) IT984506B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0055518A1 (en) * 1980-12-26 1982-07-07 Hitachi, Ltd. Solenoid valve
US5086877A (en) * 1989-03-02 1992-02-11 501 Joseph Vogele Ag Lubricant supply limiting device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3024798A (en) * 1957-05-16 1962-03-13 Fawick Corp Flow divider
US3223115A (en) * 1963-01-04 1965-12-14 W A Kates Company Flow regulating apparatus
US3502100A (en) * 1967-04-04 1970-03-24 Jaernhs Elektriska Ab Flow regulator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3024798A (en) * 1957-05-16 1962-03-13 Fawick Corp Flow divider
US3223115A (en) * 1963-01-04 1965-12-14 W A Kates Company Flow regulating apparatus
US3502100A (en) * 1967-04-04 1970-03-24 Jaernhs Elektriska Ab Flow regulator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0055518A1 (en) * 1980-12-26 1982-07-07 Hitachi, Ltd. Solenoid valve
US4546795A (en) * 1980-12-26 1985-10-15 Hitachi, Ltd. Solenoid valve
US5086877A (en) * 1989-03-02 1992-02-11 501 Joseph Vogele Ag Lubricant supply limiting device

Also Published As

Publication number Publication date
IT984506B (it) 1974-11-20
GB1314256A (en) 1973-04-18
DE2049068A1 (de) 1971-05-06
DE2049068B2 (de) 1979-10-25
FR2063990A1 (enrdf_load_stackoverflow) 1971-07-16

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