US3815057A - Device for monitoring control elements - Google Patents

Device for monitoring control elements Download PDF

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Publication number
US3815057A
US3815057A US00327165A US32716573A US3815057A US 3815057 A US3815057 A US 3815057A US 00327165 A US00327165 A US 00327165A US 32716573 A US32716573 A US 32716573A US 3815057 A US3815057 A US 3815057A
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US
United States
Prior art keywords
magnetic
magnetic bar
monitoring device
movement
valve
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
US00327165A
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English (en)
Inventor
K Stahle
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.)
Concordia Masch & Elekt
Concordia Maschinen U Elektrizitaets dt GmbH
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Concordia Masch & Elekt
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 Concordia Masch & Elekt filed Critical Concordia Masch & Elekt
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Publication of US3815057A publication Critical patent/US3815057A/en
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Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F16K31/08—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid using a permanent magnet
    • F16K31/086—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid using a permanent magnet the magnet being movable and actuating a second magnet connected to the closing element
    • F16K31/088—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid using a permanent magnet the magnet being movable and actuating a second magnet connected to the closing element the movement of the first magnet being a rotating or pivoting movement
    • 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/001—Double valve requiring the use of both hands simultaneously
    • 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
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0025—Electrical or magnetic means
    • F16K37/0041—Electrical or magnetic means for measuring valve parameters

Definitions

  • the present invention relates to a device for the monitoring of the relative position of synchronously moved control elements, in particular for the monitoring of the movement of two valve cases in safety valves for the control of pneumatic or hydraulic drives.
  • monitoring devices for safety valves
  • a mechanical coupling of the two valve cases is provided with the aid of a thin wire attached to extensions on the valve cases, the wire having current flowing 'therethrough and ruptures in case of an asynchronous movement, thus interrupting the monitoring circuit.
  • monitoring devices have the disadvantage that a new'safety wire must be installed in each case in order to return the mechanism into the operative condition, which is very time-consuming and cumbersome and unnecessarily prolongs the time for. placing the device or monitored equipment back into operation, even though the actual error had been found very quickly.
  • the present invention provides a monitoring device having an element consisting of a magnetic material fixedly attached to each valve case, these elements being arranged in symmetry to each other.
  • Each element is disposed in the zone of the free ends of a rotatably mounted magnetic bar for magneticallyinflueno ing the bar.
  • the magnetic bar is adjusted, in its basic position, to the synchronous position of the valve cases and triggers a signal for the inactivation of the drive upon rotation out of the basic position.
  • the magnetic bar when the operation is asynchronous, the magnetic bar is moved out of its basic position, and this deflected motion of the magnetic bar can be utilized for triggering a pulse for error indication and, for example, also for shutting off the control valve and thus render a press inoperative.
  • the novel monitoring device can be constructed without wear-prone parts and thus is service-free to an unlimited extent. Additionally, the device can be designed to be relatively simple and thus inexpensive.
  • the magnetic bar is maintained in its basic position by means of spring force, so that the monitoring device becomes independent of location.
  • the magnetic bar can consist of soft iron and can be disposed in a magnetic member which annularly surrounds the magnetic bar.
  • This magnetic member can be, for example, an electromagnetic coil.
  • a permanent magnet is provided as the magnetic member and is fashioned as an annular closed soft-iron bridge member.
  • a torsion rod is arranged for the monitoring of the magnetic bar so that wear of the parts due to friction does not occur.
  • the magnetic bar is arranged to engage plungers on both sides of its fulcrum. which plungers are connected to electric switches. Each rotational deflection of the bar thus triggers a switching process.
  • This arrangement fulfills the prerequisite that, in case of a disturbance, the valve cannot be returned to operation until a separate switching process is triggered after elimination of the trouble.
  • FIG. I is a schematic cross-sectional view through a safety valve having a monitoring device according to the present invention
  • FIG. 2 is an enlarged partial cross-sectional view of the monitoring device in the basic'operating position, wherein the left-hand and righbhand halves of the figure illustrate different possibilities for the construction of the magnetic bar;
  • FIG. 3 shows the monitoring deviceof FIG. 2 in the disturbance position
  • FIG. 4 is a diagram representing the force relationship at the magnetic bar of the monitoring device.
  • valve cases 2 and 3 disposed within the housing 1 of a safety valve.
  • Each valve case comprises a valve stem 2a and 3a respectively, a valve element 4 having the shape of a piston, and a disk valve member 5 attached to the valve stem.
  • the valve cases 2 and 3 are arranged within the housing 1 in such a manner that they respectively close or uncover valve seats 6 and 7 during their upward and downward movement.
  • the valve seats connect an upper pressure medium chamber 8 and a lower pressure medium chamber 9 with each other; the chambers being charged with the pressure medium in a conventional manner not illustrated in detail.
  • valve disks 5 respectively seal the lower valve seat 7, so that the communication between the chambers 8 and 9 is interrupted.
  • valve cases 2 and 3 move downwardly 'such that the disks 5 free the valve seats and the pressure chambers 8 and 9 are placed in communication with'each other.
  • the feed and discharge ducts of the pressure medium into and out of the chambers 8 and 9 are provided in the conventional manner and therefore are not shown.
  • the pressure medium passes into the spaces 10 above the pistons 4 via auxiliary control valves 11 which are controlled electromagnetically and are connected in a circuit 12 wherein two switches 13 are disposed as will be discussed below.
  • Valves of the illustrated type are utilized, for example, for the control of hydraulic presses where a flawless functioning of the valve is important, for example in order to exclude injury to the operating personnel.
  • the two valve cases 2 and 3 are'connected in parallel, so that even if one valve case should become inoperative due to a flaw, the faultless functioning of the safety valve is still ensured.
  • a prerequisite therefor is that the valve cases 2 and 3 are each moved synchronously and, in case this synchronous movement is absent, a disturbance signal is triggered which controls the machine connected thereto, for example the hydraulic press, to render the same inoperative.
  • a disturbance signal is triggered which controls the machine connected thereto, for example the hydraulic press, to render the same inoperative.
  • a monitoring devicel4 which comprises a magnetic bar 16 mounted at a torsion rod 15 and a permanent magnet fashioned as a soft-iron bridge 17.
  • the permanent magnet as can be seen particularly from FIG. 2 is provided with apertures 18 with extensions 19 of the valve stems 2a and 30 extending into these apertures, the extensions being made of a magnetic material.
  • the magnetic bar 16 can have a configuration, as shown in the left-hand portion of FIG. 2, such that the extensions 19 sweep past the ends thereof.
  • the magnetic bar can also be provided with bores 16a at both of its ends such that the exten sions 19 enter these bores and canthus exert a stronger magnetic effect.
  • the magnetic bar 16 is held in its basic position shown in FIG. 2 by the spring force of the torsion rod 15, on the one hand, and also by the two plungers 20, on the other hand, under the biasing effect of the springs 21 which press the plungers 20 against the magnetic bar 16 and keep the switches 13, mentioned above, in the closed position.
  • the safety valve as well as the press ram remain in the initial position until the flaw has been corrected and the two valve cases 2 and 3 have returned into their synchronous position and/or the magnetic bar has been returned to its basic position as shown in FIG. 2.
  • the resetting, in case of valves of the type shown in FIG. 1, i.e., in case of valves having electromagnetically controlled auxiliary valves, can be effected in a very simple manner by providing an additional switch 22 as shown in FIG. I disposed in a short-circuit branch line 23 connected to the circuit 12 and bridging the two switches
  • the axis K is used for plotting the forces effective on the magnetic bar 16, which latter acts as a type of armature in the magnetic system.
  • the forces effective on the magnetic bar 16 there are first of all the spring forces denoted by f, which are shown as a full line and which linearly increase with increasing twisting angle 5.
  • These spring forces are composed, in the illustrated example, of the spring force of the torsion rod 15 and of the forces of the springs 21 effective on the magnetic bar.
  • the magnetic forces m shown in dot-dash lines and having a square force characteristic, act in opposition to the spring forces.
  • the magnetic bar 16 is provided with one stable basic position g, namely for all angles of rotation between the two changeover points P and with two stable disturbance positions in the ranges s between the angle at the changeover point P and the respectively external abutment position. Consequently, the device of the present invention makes it possible with a corresponding dimensioning of the springs and the torsion rod 15 and an appropriate design of the magnetic forces, to eliminate the need for complicated sensing and scanning elements, or the arrangement of special, sensitive switches, since the construction of the present invention is excellently suitable, in spite of its sensitive monitoring action, for delivering mechanical forces readily sufficient for the operation of heavy-duty switches.
  • Device for monitoring the relative position of two movable elements arranged for corresponding synchronous movement comprising a first magnetic member arranged on each of said movable elements and symmetrically disposed with respect to one another, magnetic bar means mounted for rotational A movement and having a respective one of said first magnetic members arranged proximate to a respective free end thereof for magnetically influencing the positioning of said magnetic bar means, said magnetic bar means having a first basic position corresponding to the synchronous positioning of said movable elements and being rotatable from the first basic position in response to asynchronous movement of said movable elements, and means responsive to the movement of said magnetic bar means for providing an indication of the asynchronous movement of said movable elements.
  • a monitoring device according to claim 1, further comprising spring force means for biasing said magnetic bar means into the first basic position thereof.
  • a monitoring device wherein said magnetic bar means is a soft iron bar and a second magnetic member annularly surrounds said magnetic bar means, said magnetic bar means being disposed within said second magnetic member.
  • a monitoring device wherein said second magnetic member is a permanent magnet and is constructed as an annular closed soft iron bridge member.
  • a monitoring device further comprising torsion rod means for rotatably mounting said magnetic bar means.
  • said means responsive to the movement of said magnetic bar means comprises means for providing an output signal indicative of such movement including plunger means arranged for contacting said magnetic bar means proximate to each end thereof and switch means arranged in an electrical circuit means, said switch means being responsive to the movement of said plunger means for triggering an output signal in said circuit means.
  • a monitoring device wherein said magnetic bar means is positioned in accordance with the magnetic forces and spring forces effective thereon, said spring force means providing spring forces coordinated with the magnetic forces so as to provide the first basic stable position of said magnetic bar means corresponding to synchronous positioning of said movable elements within predetermined limits, and the magnetic forces effective on said magnetic bar means overcoming the spring forces in response to asynchronous movement of said movable elements to I provide two disturbance stable positions for said mag netic bar means.
  • a monitoring device further comprising switching means effective for returning said magnetic bar means from one of the stable disturbance positions to the first basic stable positions thereof.
  • a monitoring device according to claim 7, wherein said magnetic bar means is only responsive to switching means effective for returning said magnetic bar means from one of the stable disturbance positions to the first basic stable position thereof.
  • a monitoring device wherein said two movable elements are two valve means of a safety valve for controlling one of a pneumatic or hydraulic drive.
  • a monitoring device wherein said two valve means each include a movable valve stem means and said first magnetic member is fixedly arranged on said valve stem and extends therefrom.
  • a monitoring device wherein said magnetic bar means is provided with an aperture means approximate to each free end thereof, and said aperture means is arranged for receiving one of said first magnetic members extending from said valve stem means.
  • a monitoring device wherein said means for indicating the asynchronous movement of said movable elements includes means for triggering a signal for shutting off the drive which is controlled.
  • said means for triggering a signal include plunger means arranged for contacting said magnetic bar means proximate to each end thereof and switch means arranged in a circuit and being responsive to the movement of said plunger means for triggering a signal when said magnetic bar means moves from the first basic position thereof.
  • a monitoring device further comprising spring force ,means for biasing said magnetic bar means into the basic position thereof.
  • a monitoring device wherein said magnetic bar means is a soft iron bar and a second magnetic member annularly surrounds said 8 magnet and is constructed as an annular closed, soft iron bridge member.
  • said permanent magnet is provided with a plurality of aperture means and said first magnetic members extending from said valve means extend through respective ones of said aperture means into the region proximate to the free ends of said magnetic bar means.
  • a monitoring device further comprising torsion rod means for rotatably mounting said magnetic bar means.
  • said means for providing an indication of the asynchronous movement of said movable elements comprises means for triggering a signal for shutting off the drive which is controlled and includes plunger means arranged for contacting said magnetic bar means proximate to each end thereof, and switch means arranged in a circuit means and responsive to the movement of said plunger means, said plunger means actuating said switch means in response to movement of said magnetic bar means from the basic position thereof.
  • a monitoring device wherein said magentic bar means is positioned in accordance with the magnetic forces and spring forces effective thereon, said spring force means providing spring forces coordinated with the magnetic forces so as to provide the first basic stable position of said magnetic bar means corresponding to synchronous positioning of said valve means within predetermined limits, and the magnetic forces effective on said magnetic bar means overcoming the spring forces in response to asynchronous movement of said valve means to provide two stable disturbance positions for said magnetic bar means.
  • a monitoring device further comprising switching means effective for returning said magnetic bar means from one of the stable disturbance positions thereof to the first basic stable position bar, said bar being disposed within said second magnetic member.
  • a monitoring device wherein said second magnetic member is a permanent circuit means of said auxiliary control valve means.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Servomotors (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)
  • Magnetically Actuated Valves (AREA)
  • Control Of Presses (AREA)
  • Control Of Position Or Direction (AREA)
US00327165A 1972-01-25 1973-01-26 Device for monitoring control elements Expired - Lifetime US3815057A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2203266A DE2203266C2 (de) 1972-01-25 1972-01-25 Einrichtung zur Überwachung von Steuerteilen

Publications (1)

Publication Number Publication Date
US3815057A true US3815057A (en) 1974-06-04

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US00327165A Expired - Lifetime US3815057A (en) 1972-01-25 1973-01-26 Device for monitoring control elements

Country Status (13)

Country Link
US (1) US3815057A (xx)
JP (1) JPS4886116A (xx)
BE (1) BE794410A (xx)
DD (1) DD101732A5 (xx)
DE (1) DE2203266C2 (xx)
ES (1) ES410704A1 (xx)
FR (1) FR2169383B1 (xx)
GB (1) GB1397182A (xx)
IT (1) IT973099B (xx)
LU (1) LU66768A1 (xx)
NL (1) NL7300041A (xx)
SE (1) SE375359B (xx)
SU (1) SU515470A3 (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1055855A1 (fr) * 1999-05-28 2000-11-29 Crouzet Automatismes Dispositif de détection de la fermeture simultanée de deux organes mobiles et son application à un système coupe-feu à clapet
US6881913B1 (en) * 2004-02-17 2005-04-19 Dss Operating Valve Company Pressure operated safety switch
US20050224510A1 (en) * 2004-03-15 2005-10-13 Remis Steven J Vacuum based pill singulator and counter based thereon
US20080129425A1 (en) * 2004-10-29 2008-06-05 Markus Leipold Electric Switching Device Comprising Magnetic And/Or Fluidic Adjusting Elements

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103062490B (zh) * 2013-01-25 2014-10-22 北京通宇泰克科技有限公司 角度式磁力导电球阀门开关
CN105972228B (zh) * 2016-06-29 2018-06-08 北京科勒有限公司 控制阀和用于该控制阀的联动件

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US798082A (en) * 1903-02-07 1905-08-29 Otis Elevator Co Automatic controller for electric circuits.
US2575086A (en) * 1947-02-14 1951-11-13 Gen Electric Magnetic valve
US2869475A (en) * 1951-12-21 1959-01-20 Phillips Petroleum Co Control system
US3562455A (en) * 1968-03-27 1971-02-09 Malcolm M Mcqueen Mechanical displacement type flow switch with fluid state maintenance heating means

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1113496B (de) * 1958-01-07 1961-09-07 Oec Hermann Tiefenbach Dipl In Durch einen vorbeizufuehrenden Dauermagneten steuerbarer elektrischer Schalter
US3602254A (en) * 1970-01-30 1971-08-31 Pratt Co Henry Valve position indicating system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US798082A (en) * 1903-02-07 1905-08-29 Otis Elevator Co Automatic controller for electric circuits.
US2575086A (en) * 1947-02-14 1951-11-13 Gen Electric Magnetic valve
US2869475A (en) * 1951-12-21 1959-01-20 Phillips Petroleum Co Control system
US3562455A (en) * 1968-03-27 1971-02-09 Malcolm M Mcqueen Mechanical displacement type flow switch with fluid state maintenance heating means

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1055855A1 (fr) * 1999-05-28 2000-11-29 Crouzet Automatismes Dispositif de détection de la fermeture simultanée de deux organes mobiles et son application à un système coupe-feu à clapet
FR2794210A1 (fr) * 1999-05-28 2000-12-01 Crouzet Automatismes Dispositif de detection de la fermeture simultanee de deux organes mobiles et son application a un systeme coupe-feu a clapet
US6881913B1 (en) * 2004-02-17 2005-04-19 Dss Operating Valve Company Pressure operated safety switch
US20050224510A1 (en) * 2004-03-15 2005-10-13 Remis Steven J Vacuum based pill singulator and counter based thereon
US20080129425A1 (en) * 2004-10-29 2008-06-05 Markus Leipold Electric Switching Device Comprising Magnetic And/Or Fluidic Adjusting Elements

Also Published As

Publication number Publication date
LU66768A1 (xx) 1973-03-01
DD101732A5 (xx) 1973-11-12
SU515470A3 (ru) 1976-05-25
IT973099B (it) 1974-06-10
FR2169383B1 (xx) 1976-05-14
DE2203266B1 (de) 1973-03-08
DE2203266C2 (de) 1973-09-27
NL7300041A (xx) 1973-07-27
FR2169383A1 (xx) 1973-09-07
SE375359B (xx) 1975-04-14
ES410704A1 (es) 1976-01-01
BE794410A (fr) 1973-05-16
GB1397182A (en) 1975-06-11
DE2203266A1 (xx) 1973-03-08
JPS4886116A (xx) 1973-11-14

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